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Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 31, 2018	Apr. 25, 2018
Document and Entity Information [Abstract]
Entity Registrant Name	Veritex Holdings, Inc.
Entity Central Index Key	0001501570
Document Type	10-Q
Document Period End Date	Mar. 31, 2018
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding (in shares)		24,148,706
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q1

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
ASSETS
Cash and due from banks	$ 26,861	$ 38,243
Interest bearing deposits in other banks	168,333	110,801
Total cash and cash equivalents	195,194	149,044
Investment securities	243,164	228,117
Loans held for sale	893	841
Loans, net of allowance for loan losses of $13,401 and $12,808, respectively	2,302,664	2,220,682
Accrued interest receivable	7,127	7,676
Bank-owned life insurance	21,620	21,476
Bank premises, furniture and equipment, net	76,045	75,251
Non-marketable equity securities	20,806	13,732
Investment in unconsolidated subsidiary	352	352
Other real estate owned	10	449
Intangible assets, net of accumulated amortization of $4,673 and $3,468, respectively	18,372	20,441
Goodwill	161,685	159,452
Other assets	13,634	14,518
Branch assets held for sale	1,753	33,552
Total assets	3,063,319	2,945,583
Deposits:
Noninterest-bearing	597,236	612,830
Interest-bearing	1,896,558	1,665,800
Total deposits	2,493,794	2,278,630
Accounts payable and accrued expenses	3,862	5,098
Accrued interest payable and other liabilities	3,412	5,446
Advances from Federal Home Loan Bank	48,128	71,164
Junior subordinated debentures	11,702	11,702
Subordinated notes	4,988	4,987
Other borrowings	0	15,000
Branch liabilities held for sale	0	64,627
Total liabilities	2,565,886	2,456,654
Commitments and contingencies (Note 6)
Stockholders’ equity:
Common stock, $0.01 par value; 75,000,000 shares authorized at March 31, 2018 and December 31, 2017; 24,148,484 and 24,109,515 shares issued and outstanding at March 31, 2018 and December 31, 2017, respectively (excluding 10,000 shares held in treasury)	241	241
Additional paid-in capital	445,964	445,517
Retained earnings	55,015	44,627
Unallocated Employee Stock Ownership Plan shares; 9,771 shares at March 31, 2018 and December 31, 2017	(106)	(106)
Accumulated other comprehensive loss	(3,611)	(1,280)
Treasury stock, 10,000 shares at cost	(70)	(70)
Total stockholders’ equity	497,433	488,929
Total liabilities and stockholders’ equity	$ 3,063,319	$ 2,945,583

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Allowance for loan losses	$ 13,401	$ 12,808
Intangible assets, accumulated amortization	$ 4,673	$ 3,468
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	75,000,000	75,000,000
Common stock, shares issued (in shares)	24,148,484	24,109,515
Common stock, shares outstanding (in shares)	24,148,484	24,109,515
Unallocated Employee Stock Ownership Plan shares, shares (in shares)	9,771	9,771
Treasury stock, shares (in shares)	10,000	10,000

Condensed Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Interest income:
Interest and fees on loans	$ 32,067	$ 11,883
Interest on investment securities	1,328	575
Interest on deposits in other banks	687	610
Interest on other	5	1
Total interest income	34,087	13,069
Interest expense:
Interest on deposit accounts	4,293	1,647
Interest on borrowings	692	169
Total interest expense	4,985	1,816
Net interest income	29,102	11,253
Provision for loan losses	678	890
Net interest income after provision for loan losses	28,424	10,363
Noninterest income:
Service charges and fees on deposit accounts	933	509
Gain on sales of investment securities	8	0
Net gain on sales of loans and other assets owned	581	747
Bank-owned life insurance	189	187
Other	1,070	92
Total noninterest income	2,781	1,535
Noninterest expense:
Salaries and employee benefits	7,930	3,908
Occupancy and equipment	3,234	1,011
Professional fees	1,802	798
Data processing and software expense	828	360
FDIC assessment fees	302	258
Marketing	461	244
Other assets owned expenses and write-downs	172	25
Amortization of intangibles	978	95
Telephone and communications	426	102
Other	1,173	649
Total noninterest expense	17,306	7,450
Net income from operations	13,899	4,448
Income tax expense	3,511	1,350
Net income	$ 10,388	$ 3,098
Basic earnings per share (in dollars per share)	$ 0.43	$ 0.20
Diluted earnings per share (in dollars per share)	$ 0.42	$ 0.20

Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 10,388	$ 3,098
Other comprehensive (loss) income:
Unrealized (losses) gains on securities available for sale arising during the period, net	(2,943)	304
Reclassification adjustment for net gains included in net income	8	0
Other comprehensive income (loss) before tax	(2,951)	304
Income tax (benefit) expense	(620)	104
Other comprehensive (loss) income, net of tax	(2,331)	200
Comprehensive income	$ 8,057	$ 3,298

Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive (Loss) Income	Unallocated Employee Stock Ownership Plan Shares	Treasury Stock
Beginning balance (in shares) at Dec. 31, 2016		15,195,328
Beginning balance at Dec. 31, 2016	$ 239,088	$ 152	$ 211,173	$ 29,290	$ (1,248)	$ (209)	$ (70)
Increase (Decrease) in Stockholders' Equity
Restricted stock units vested, net of shares withheld to cover tax withholdings (in shares)		34,108
Restricted stock units vested, net of shares withheld to cover tax withholdings	(41)		(41)
Stock based compensation	396		396
Deferred offering costs	(16)		(16)
Net income	3,098			3,098
Other comprehensive loss	200				200
Ending balance (in shares) at Mar. 31, 2017		15,229,436
Ending balance at Mar. 31, 2017	$ 242,725	$ 152	211,512	32,388	(1,048)	(209)	(70)
Beginning balance (in shares) at Dec. 31, 2017	24,109,515	24,109,515
Beginning balance at Dec. 31, 2017	$ 488,929	$ 241	445,517	44,627	(1,280)	(106)	(70)
Increase (Decrease) in Stockholders' Equity
Restricted stock units vested, net of shares withheld to cover tax withholdings (in shares)		34,068
Restricted stock units vested, net of shares withheld to cover tax withholdings	(269)		(269)
Exercise of employee stock options, net of 4,391 shares for cashless exercise and net of shares 1,691 withheld to cover tax withholdings (in shares)		4,901
Exercise of employee stock options, net of 4,391 shares for cashless exercise and net of shares 1,691 withheld to cover tax withholdings	(55)		(55)
Stock based compensation	771		771
Net income	10,388			10,388
Other comprehensive loss	$ (2,331)				(2,331)
Ending balance (in shares) at Mar. 31, 2018	24,148,484	24,148,484
Ending balance at Mar. 31, 2018	$ 497,433	$ 241	$ 445,964	$ 55,015	$ (3,611)	$ (106)	$ (70)

Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (Parenthetical) - shares	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Restricted Stock Units
Shares withheld to cover tax withholdings (in shares)	9,704	7,103,000
Employee Stock Options
Shares withheld to cover tax withholdings (in shares)	1,691
Shares paid for cashless exercise (in shares)	4,391

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities:
Net income	$ 10,388	$ 3,098
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	1,986	446
Provision for loan losses	678	890
Accretion of loan purchase discount	(1,823)	(55)
Stock-based compensation expense	771	396
Excess tax benefit from stock compensation	(84)	(172)
Net amortization of premiums on investment securities	491	304
Change in cash surrender value of bank-owned life insurance	(144)	(147)
Net gain on sales of investment securities	(8)	0
Gain on sales of loans held for sale	(223)	(237)
Gain on sales of SBA loans	(358)	(510)
Amortization of subordinated note discount and debt issuance costs	1	2
Net originations of loans held for sale	(9,965)	(7,875)
Write down on other real estate owned	156	0
Proceeds from sales of loans held for sale	10,136	11,395
Gain on sale of branches	(355)	0
Decrease (increase) in accrued interest receivable and other assets	4,247	(409)
(Decrease) increase in accounts payable, accrued expenses, accrued interest payable and other liabilities	(2,625)	7,838
Net cash provided by operating activities	13,269	14,964
Cash flows from investing activities:
Cash settlement for sale of branches	(33,557)	0
Purchases of securities available for sale	(54,999)	(40,355)
Sales of securities available for sale	30,149	0
Proceeds from maturities, calls and pay downs of investment securities	6,369	4,216
Purchases of non-marketable equity securities, net	(7,074)	(9)
Net loans originated	(115,464)	(38,008)
Proceeds from sale of SBA loans	30,355	8,559
Net additions to bank premises and equipment	(295)	(397)
Proceeds from sales of other real estate owned	291	0
Net cash used in investing activities	(144,225)	(65,994)
Cash flows from financing activities:
Net change in deposits	215,466	102,066
Net decrease in advances from Federal Home Loan Bank	(23,036)	(35)
Net change in other borrowings	(15,000)	0
Payments to tax authorities for stock-based compensation	(324)	(41)
Offering costs paid in connection with acquisition	0	(16)
Net cash provided by financing activities	177,106	101,974
Net increase in cash and cash equivalents	46,150	50,944
Cash and cash equivalents at beginning of period	149,044	234,791
Cash and cash equivalents at end of period	$ 195,194	$ 285,735

Summary of Significant Accounting Policies

3 Months Ended

Mar. 31, 2018

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

Nature of Organization

Veritex Holdings, Inc. (“Veritex” or the “Company”), a Texas corporation and bank holding company, was incorporated in July 2009 and was formed for the purpose of acquiring one or more financial institutions located in Dallas, Texas and surrounding areas.

Veritex through its wholly-owned subsidiary, Veritex Community Bank (the “Bank”), is a Texas state banking organization, with corporate offices in Dallas, Texas, and currently operates 20 branches and one mortgage office located in the Dallas-Fort Worth metroplex and one branch in the Houston metropolitan area. The Bank provides a full range of banking services to individual and corporate customers, which include commercial and retail lending, and the acceptance of checking and savings deposits. The Texas Department of Banking and the Board of Governors of the Federal Reserve System are the primary regulators of the Company and the Bank, which perform periodic examinations to ensure regulatory compliance.

Basis of Presentation

The accompanying unaudited condensed consolidated financial statements include the accounts of Veritex and the Bank as its wholly-owned subsidiary.

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States of America (“GAAP”), but do not include all of the information and footnotes required for complete financial statements. In management’s opinion, these interim unaudited condensed consolidated financial statements include all adjustments of a normal recurring nature necessary for a fair statement of the Company’s condensed consolidated financial position at March 31, 2018 and December 31, 2017, condensed consolidated results of operations for the three months ended March 31, 2018 and 2017, condensed consolidated stockholders’ equity for the three months ended March 31, 2018 and 2017 and condensed consolidated cash flows for the three months ended March 31, 2018 and 2017.

Accounting measurements at interim dates inherently involve greater reliance on estimates than at year end and the results for the interim periods shown herein are not necessarily indicative of results to be expected for the full year due in part to global economic and financial market conditions, interest rates, access to sources of liquidity, market competition and interruptions of business processes. These interim unaudited condensed consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements and notes thereto for the year ended December 31, 2017 included within the Company’s Form 10-K as filed with the Securities and Exchange Commission on March 14, 2018.

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the condensed consolidated financial statements and accompanying notes. These estimates and assumptions may also affect disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from these estimates.

Segment Reporting

The Company has one reportable segment. All of the Company’s activities are interrelated, and each activity is dependent and assessed based on how each of the activities of the Company supports the others. For example, lending is dependent upon the ability of the Company to fund itself with deposits and borrowings while managing the interest rate and credit risk. Accordingly, all significant operating decisions are based upon analysis of the Bank as one segment or unit. The Company’s chief operating decision-maker, the Chief Executive Officer, uses the consolidated results to make operating and strategic decisions.

Reclassifications

Some items in the prior year financial statements were reclassified to conform to the current presentation.

Revenue from Contracts with Customers

The Company records revenue from contracts with customers in accordance with Accounting Standards Codification Topic 606, “Revenue from Contracts with Customers” (“Topic 606”). Under Topic 606, the Company must identify the contract with a customer, identify the performance obligations in the contract, determine the transaction price, allocate the transaction price to the performance obligations in the contract, and recognize revenue when (or as) the Company satisfies a performance obligation. Significant revenue has not been recognized in the current reporting period that results from performance obligations satisfied in previous periods.

The Company’s primary sources of revenue are derived from interest income on financial assets that are not within the scope of Topic 606. The Company has evaluated the nature of its contracts with customers and determined that further disaggregation of revenue from contracts with customers into more granular categories beyond what is presented in the Condensed Consolidated Statements of Income was not necessary. The Company generally fully satisfies its performance obligations on its contracts with customers as services are rendered and the transaction prices are typically fixed; charged either on a periodic basis or based on activity. Because performance obligations are satisfied as services are rendered and the transaction prices are fixed, there is little judgment involved in applying Topic 606 that significantly affects the determination of the amount and timing of revenue from contracts with customers.

Earnings Per Share

Earnings per share (“EPS”) are based upon the weighted-average shares outstanding. The table below sets forth the reconciliation between weighted average shares used for calculating basic and diluted EPS for the three months ended March 31, 2018 and 2017:



	Three Months Ended March 31,
	2018		2017
Earnings (numerator)
Net income	$	10,388	$	3,098
Shares (denominator) in thousands
Weighted average shares outstanding for basic EPS	24,120		15,200
Dilutive effect of employee stock-based awards	419		432
Adjusted weighted average shares outstanding	24,539		15,632
Earnings per share:
Basic	$	0.43	$	0.20
Diluted	$	0.42	$	0.20

For the three months ended March 31, 2018 and 2017, there were no antidilutive shares excluded from the diluted EPS weighted average shares.

Adoption of New Accounting Standards

In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2014-09, “Revenue from Contracts with Customers” (“ASU 2014-09”), which requires an entity to recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The ASU replaces most existing revenue recognition guidance in GAAP. The new standard was effective for the Company on January 1, 2018. Adoption of ASU 2014-09 did not have a material impact on the Company’s condensed consolidated financial statements and related disclosures as the Company’s primary sources of revenues are derived from interest income on financial assets that are not within the scope of ASU 2014-09. The Company’s revenue recognition pattern for revenue streams within the scope of ASU 2014-09, including but not limited to service charges on deposit accounts, did not change significantly from current practice. The standard permits the use of either the full retrospective or modified retrospective transition method. The Company elected to use the modified retrospective transition method which requires application of ASU 2014-09 to uncompleted contracts at the date of adoption. However, periods prior to the date of adoption will not be retrospectively revised as the impact of the ASU on uncompleted contracts at the date of adoption was not material.

In January 2016, the FASB issued ASU No. 2016-01, “Financial Instruments – Overall: Recognition and Measurement of Financial Assets and Financial Liabilities” (“ASU 2016-01”) which amends certain aspects of recognition, measurement, presentation, and disclosure of financial instruments. ASU 2016-01, among other things, (i) requires equity investments, with certain exceptions, to be measured at fair value with changes in fair value recognized in net income, (ii) simplifies the impairment assessment of equity investments without readily determinable fair values by requiring a qualitative assessment to identify impairment, (iii) eliminates the requirement for public business entities to disclose the methods and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet, (iv) requires public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes, (v) requires an entity to present separately in other comprehensive income the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option for financial instruments, (vi) requires separate presentation of financial assets and financial liabilities by measurement category and form of financial asset on the balance sheet or the accompanying notes to the financial statements and (vii) clarifies that an entity should evaluate the need for a valuation allowance on a deferred tax asset related to available-for-sale. The adoption of ASU 2016-01 on January 1, 2018 did not have a material impact on the Company’s condensed consolidated financial statements. In accordance with (iv) above, the Company measured the fair value of its loan portfolio prospectively as of March 31, 2018 using an exit price notion. See Note 7 – Fair Value Disclosures for further information regarding the valuation of these loans.

Recent Accounting Pronouncements

ASU 2017-04 “Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment” (“ASU 2017-04”) eliminates Step 2 from the goodwill impairment test. In addition, the amendment eliminates the requirements for any reporting unit with a zero or negative carrying amount to perform a qualitative assessment and, if it fails that qualitative test, to perform Step 2 of the goodwill impairment test. For public companies, ASU 2017-04 is effective for fiscal years beginning after December 15, 2019 with early adoption permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017. The Company is in process of evaluating the impact of this pronouncement, which is not expected to have a significant impact on the consolidated financial statements.

ASU 2016-13 “Financial Instruments —Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments” (“ASU 2016-13”) amends guidance on reporting credit losses for assets held at amortized cost basis and available for sale debt securities. For assets held at amortized cost basis, Topic 326 eliminates the probable initial recognition threshold in current GAAP and, instead, requires an entity to reflect its current estimate of all expected credit losses. The allowance for credit losses is a valuation account that is deducted from the amortized cost basis of the financial assets to present the net amount expected to be collected. For available for sale debt securities, credit losses should be measured in a manner similar to current GAAP, however Topic 326 will require that credit losses be presented as an allowance rather than as a write-down. ASU 2016-13 affects entities holding financial assets and net investment in leases that are not accounted for at fair value through net income. The amendments affect loans, debt securities, trade receivables, net investments in leases, off balance sheet credit exposures, reinsurance receivables, and any other financial assets not excluded from the scope that have the contractual right to receive cash. For public business entities, ASU 2016-13 is effective for financial statements issued for fiscal years beginning after December 15, 2019, and interim periods therein. The Company is continuing to evaluate the impact of the adoption of ASU 2016-13 and is uncertain of the impact on the consolidated financial statements at this point in time.

ASU 2016-02 “Leases (Topic 842)” (“ASU 2016-02”) is intended to improve the reporting of leasing transactions to provide users of financial statements with more decision-useful information. ASU 2016-02 will require organizations that lease assets to recognize on the balance sheet the assets and liabilities for the rights and obligations created by those leases. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Early adoption is permitted. Adoption of ASU 2016-02 is not expected to have a material impact on the Company’s consolidated financial statements. The Company leases certain properties and equipment under operating leases that will result in the recognition of lease assets and lease liabilities on the Company’s balance sheet under ASU 2016-02, however, the majority of the Company’s properties and equipment are owned, not leased. We expect recorded assets and liabilities to increase upon adoption of the standard as it relates to operating leases in which we are the lessee.

Supplemental Statement of Cash Flows

3 Months Ended

Mar. 31, 2018

Supplemental Cash Flow Elements [Abstract]

Supplemental Statement of Cash Flows

Other supplemental cash flow information is presented below:



	Three Months Ended March 31,
	2018			2017
Supplemental Disclosures of Cash Flow Information:
Cash paid for interest	$	4,928		$	1,834
Supplemental Disclosures of Non-Cash Flow Information:
Net foreclosure of other real estate owned and repossessed assets	$	8		$	336
Non-cash assets acquired⁽¹⁾
Loans	$	(4,622	)	$	—
Bank premises, furniture and equipment	1,162			—
Intangible assets	(956		)	—
Goodwill	2,233			—
Other assets	1,934			—
Non-cash liabilities assumed⁽¹⁾
Deposits	$	(303	)	$	—
Accrued interest payable and other liabilities	54			—

(1) Represents adjustments to provision estimates recorded for acquisitions of Sovereign Bancshares, Inc. and Liberty Bancshares, Inc.. Refer to Note 12. Business Combinations for further discussion.

Investment Securities

3 Months Ended

Mar. 31, 2018

Investments, Debt and Equity Securities [Abstract]

Investment Securities

Debt and equity securities have been classified in the condensed consolidated balance sheets according to management’s intent. The amortized cost, related gross unrealized gains and losses recognized in accumulated other comprehensive income (loss), and the fair value of securities are as follows:



	March 31, 2018
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Available for Sale
U.S. government agencies	$	10,362	$	—	$	181	$	10,181
Corporate bonds	20,852		98		10		20,940
Municipal securities	44,878		44		445		44,477
Mortgage-backed securities	94,406		37		2,448		91,995
Collateralized mortgage obligations	76,651		6		1,678		74,979
Asset-backed securities	586		6		—		592
	$	247,735	$	191	$	4,762	$	243,164



	December 31, 2017
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Available for Sale
U.S. government agencies	$	10,829	$	9	$	18	$	10,820
Corporate bonds	17,500		330		—		17,830
Municipal securities	55,499		189		211		55,477
Mortgage-backed securities	91,734		58		1,068		90,724
Collateralized mortgage obligations	53,559		9		925		52,643
Asset-backed securities	616		7		—		623
	$	229,737	$	602	$	2,222	$	228,117

The following tables disclose the Company’s investment securities that have been in a continuous unrealized loss position for less than 12 months and those that have been in a continuous unrealized loss position for 12 or more months:



	March 31, 2018
	Less Than 12 Months				12 Months or More				Totals
	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
Available for Sale
U.S. government agencies	$	9,606	$	161	$	576	$	20	$	10,182	$	181
Corporate bonds	3,990		10		—		—		3,990		10
Municipal securities	27,412		257		5,406		188		32,818		445
Mortgage-backed securities	61,666		1,592		23,140		856		84,806		2,448
Collateralized mortgage obligations	28,317		756		23,024		922		51,341		1,678
	$	130,991	$	2,776	$	52,146	$	1,986	$	183,137	$	4,762



	December 31, 2017
	Less Than 12 Months				12 Months or More				Totals
	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
	Value		Loss		Value		Loss		Value		Loss
Available for Sale
U.S. government agencies	$	3,470	$	4	$	629	$	14	$	4,099	$	18
Municipal securities	14,593		79		7,092		132		21,685		211
Mortgage-backed securities	52,075		513		29,485		555		81,560		1,068
Collateralized mortgage obligations	31,581		395		20,305		530		51,886		925
	$	101,719	$	991	$	57,511	$	1,231	$	159,230	$	2,222

The number of investment positions in an unrealized loss position totaled 142 and 118 at March 31, 2018 and December 31, 2017, respectively. The Company does not believe these unrealized losses are “other than temporary.” In estimating other-than-temporary impairment losses, management considers, among other things, the length of time and the extent to which the fair value has been less than cost and the Company’s financial condition and near-term prospects. Additionally, (i) management does not have the intent to sell investment securities prior to recovery and/or maturity, (ii) it is more likely than not that the Company will not have to sell these securities prior to recovery and/or maturity and (iii) that the length of time and extent that fair value has been less than cost is not indicative of recoverability. The unrealized losses noted are interest rate related due to the level of interest rates at March 31, 2018 compared to the time of purchase. The Company has reviewed the ratings of the issuers and has not identified any issues related to the ultimate repayment of principal as a result of credit concerns on these securities.

The amortized costs and estimated fair values of securities available for sale, by contractual maturity, as of the dates indicated, are shown in the table below. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayments penalties. Mortgage-backed securities, collateralized mortgage obligations, and asset-backed securities typically are issued with stated principal amounts, and the securities are backed by pools of mortgage loans and other loans that have varying maturities. The term of mortgage-backed, collateralized mortgage obligations and asset-backed securities thus approximates the term of the underlying mortgages and loans and can vary significantly due to prepayments. Therefore, these securities are not included in the maturity categories below.



	March 31, 2018
	Available For Sale
	Amortized Cost		Fair Value
Due in one year or less	$	2,265	$	2,271
Due from one year to five years	23,624		23,548
Due from five years to ten years	27,624		27,449
Due after ten years	22,579		22,330
	76,092		75,598
Mortgage-backed securities	94,406		91,995
Collateralized mortgage obligations	76,651		74,979
Asset-backed securities	586		592
	$	247,735	$	243,164



	December 31, 2017
	Available For Sale
	Amortized Cost		Fair Value
Due in one year or less	$	2,328	$	2,330
Due from one year to five years	29,654		29,991
Due from five years to ten years	34,480		34,474
Due after ten years	17,366		17,332
	83,828		84,127
Mortgage-backed securities	91,734		90,724
Collateralized mortgage obligations	53,559		52,643
Asset-backed securities	616		623
	$	229,737	$	228,117

Proceeds from sales of investment securities available for sale and gross gains and losses for the three months ended March 31, 2018 and 2017 were as follows:



	Three Months Ended March 31,
	2018		2017
Proceeds from sales	$	30,149	$	—
Gross realized gains	323		—
Gross realized losses	315		—

There was a blanket floating lien on all securities held by the Company to secure Federal Home Loan Bank advances as of March 31, 2018 and December 31, 2017.

Loans and Allowance for Loan Losses

3 Months Ended

Mar. 31, 2018

Receivables [Abstract]

Loans and Allowance for Loan Losses

Loans in the accompanying condensed consolidated balance sheets are summarized as follows:



	March 31, 2018			December 31, 2017
Real estate:
Construction and land	$	301,023		$	277,825
Farmland	9,366			9,385
1 - 4 family residential	246,806			236,542
Multi-family residential	122,482			106,275
Commercial Real Estate	955,541			909,292
Commercial	672,820			684,551
Consumer	8,051			9,648
	2,316,089			2,233,518
Deferred loan fees	(24		)	(28		)
Allowance for loan losses	(13,401		)	(12,808		)
	$	2,302,664		$	2,220,682

Included in the net loan portfolio as of March 31, 2018 and December 31, 2017 is an accretable discount related to purchased performing and purchased credit impaired (“PCI”) loans acquired within a business combination in the approximate amounts of $14,571 and $12,135, respectively. The discount is being accreted into income on a level-yield basis over the life of the loans. In addition, included in the net loan portfolio as of March 31, 2018 and December 31, 2017 is a discount on retained loans from sale of originated Small Business Administration (“SBA”) loans of $1,771 and $1,189, respectively.

The majority of the loan portfolio is comprised of loans to businesses and individuals in the Dallas-Fort Worth metroplex and the Houston metropolitan area. This geographic concentration subjects the loan portfolio to the general economic conditions within these areas. The risks created by this concentration have been considered by management in the determination of the adequacy of the allowance for loan losses. Management believes the allowance for loan losses was adequate to cover estimated losses on loans as of March 31, 2018 and December 31, 2017.

Non-Accrual and Past Due Loans

Loans are considered past due if the required principal and interest payments have not been received as of the date such payments were due. Loans are placed on non-accrual status when, in management’s opinion, the borrower may be unable to meet payment obligations as they become due, as well as when required by regulatory provisions. Loans may be placed on non-accrual status regardless of whether or not such loans are considered past due. When interest accrual is discontinued, all unpaid accrued interest is reversed. Interest income is subsequently recognized only to the extent cash payments are received in excess of principal due. Loans are returned to accrual status when all the principal and interest amounts contractually due are brought current and future payments are reasonably assured.

Non-accrual loans aggregated by class of loans, as of March 31, 2018 and December 31, 2017, are as follows:



	Non-Accrual Loans⁽¹⁾
	March 31, 2018		December 31, 2017
Real estate:
Construction and land	$	2,769	$	—
Farmland	—		—
1 - 4 family residential	—		—
Multi-family residential	—		—
Commercial Real Estate	59		61
Commercial	605		398
Consumer	5		6
	$	3,438	$	465

⁽¹⁾Excludes PCI loans. PCI loans are generally reported as accrual loans unless significant concerns exist related to the predictability of the timing and amount of future cash flows.

During the three months ended March 31, 2018 and 2017, interest income not recognized on non-accrual loans was minimal.

An age analysis of past due loans, aggregated by class of loans, as of March 31, 2018 and December 31, 2017 is as follows:



	March 31, 2018
	30 to 59 Days		60 to 89 Days		90 Days or Greater		Total Past Due		Total Current ⁽¹⁾		Total Loans		Total 90 Days Past Due and Still Accruing⁽²⁾
Real estate:
Construction and land	$	—	$	—	$	2,769	$	2,769	$	298,254	$	301,023	$	—
Farmland	—		—		—		—		9,366		9,366		—
1 - 4 family residential	23		37		—		60		246,746		246,806		—
Multi-family residential	—		—		—		—		122,482		122,482		—
Commercial Real Estate	874		—		—		874		954,667		955,541		—
Commercial	982		49		451		1,482		671,338		672,820		374
Consumer	47		48		—		95		7,956		8,051		—
	$	1,926	$	134	$	3,220	$	5,280	$	2,310,809	$	2,316,089	$	374

⁽¹⁾ Includes all PCI loans.

⁽²⁾ Loans 90 days past due and still accruing excludes $2,000 of PCI loans as of March 31, 2018. No PCI loans were considered non-performing loans as of March 31, 2018.



	December 31, 2017
	30 to 59 Days		60 to 89 Days		90 Days or Greater		Total Past Due		Total Current⁽¹⁾⁽³⁾		Total Loans		Total 90 Days Past Due and Still Accruing
Real estate:
Construction and land	$	320	$	—	$	—	$	320	$	277,505	$	277,825	$	—
Farmland	104		—		—		104		9,281		9,385		—
1 - 4 family residential	1,274		139		—		1,413		235,129		236,542		—
Multi-family residential	—		—		—		—		106,275		106,275		—
Commercial Real Estate	1,830		—		—		1,830		907,462		909,292		—
Commercial	1,849		389		389		2,627		681,924		684,551		—
Consumer	39		51		18		108		9,540		9,648		18
	$	5,416	$	579	$	407	$	6,402	$	2,227,116	$	2,233,518	$	18

⁽¹⁾ Includes all PCI loans.

⁽²⁾ Loans 90 days past due and still accruing excludes $3,300 of PCI loans as of December 31, 2017. No PCI loans were considered non-performing loans as of December 31, 2017.

⁽³⁾ To conform to the current period presentation, $15,123 was reclassified from 1-4 family residential to multi-family residential within the total current column.

Loans past due 90 days and still accruing increased from $18 as of December 31, 2017 to $374 as of March 31, 2018. These loans are also considered well-secured and in the process of collection with plans in place for the borrowers to bring the notes fully current. The Company believes that it will collect all principal and interest due on each of the loans past due 90 days and still accruing.

Impaired Loans

Impaired loans are those loans where it is probable the Company will be unable to collect all amounts due in accordance with the original contractual terms of the loan agreement, including scheduled principal and interest payments. All troubled debt restructurings (“TDRs”) are considered impaired loans. Impaired loans are measured based on either the present value of expected future cash flows discounted at the loan’s effective interest rate; the loan’s observable market price; or the fair value of the collateral if the loan is collateral dependent. Substantially all of the Company’s impaired loans are measured at the fair value of the collateral. Impaired loans, or portions thereof, are charged off when deemed uncollectible.

Impaired loans, including PCI loans that have experienced further deterioration in credit quality subsequent to the acquisitions and TDRs, at March 31, 2018 and December 31, 2017, are summarized in the following tables.



	March 31, 2018 ⁽¹⁾
	Unpaid Contractual Principal Balance		Recorded Investment with No Allowance		Recorded Investment With Allowance		Total Recorded Investment		Related Allowance		Average Recorded Investment YTD
Real estate:
Construction and land	$	2,769	$	2,769	$	—	$	2,769	$	—	$	2,769
Farmland	—		—		—		—		—		—
1 - 4 family residential	161		161		—		161		—		161
Multi-family residential	—		—		—		—		—		—
Commercial Real Estate	429		429		—		429		—		434
Commercial	605		346		259		605		66		638
Consumer	74		74		—		74		—		78
Total	$	4,038	$	3,779	$	259	$	4,038	$	66	$	4,080

⁽¹⁾Excludes PCI loans that have not experienced further deterioration in credit quality subsequent to the acquisition date.



	December 31, 2017⁽¹⁾
	Unpaid Contractual Principal Balance		Recorded Investment with No Allowance		Recorded Investment With Allowance		Total Recorded Investment		Related Allowance		Average Recorded Investment YTD
Real estate:
Construction and land	$	—	$	—	$	—	$	—	$	—	$	—
Farmland	—		—		—		—		—		—
1 - 4 family residential	161		161		—		161		—		163
Multi-family residential	—		—		—		—		—		—
Commercial Real Estate	434		434		—		434		—		445
Commercial	398		282		116		398		12		499
Consumer	75		75		—		75		—		87
Total	$	1,068	$	952	$	116	$	1,068	$	12	$	1,194

⁽¹⁾Excludes PCI loans that have not experienced further deterioration in credit quality subsequent to the acquisition date.

Interest payments on impaired loans are typically applied to principal unless collectability of the principal amount is reasonably assured, in which case interest is recognized on a cash basis.

During the three months ended March 31, 2018 and 2017, total interest income and cash-based interest income recognized on impaired loans was minimal.

Troubled Debt Restructuring

Modifications of terms for the Company’s loans and their inclusion as TDRs are based on individual facts and circumstances. Loan modifications that are included as TDRs may involve a reduction of the stated interest rate of the loan, an extension of the maturity date at a stated rate of interest lower than the current market rate for new debt with similar risk, or deferral of principal payments, regardless of the period of the modification. The recorded investment in TDRs was $613 and $618 as of March 31, 2018 and December 31, 2017, respectively.

There were no new TDRs during the three months ended March 31, 2018 and 2017.

There were no loans modified as TDR loans within the previous 12 months and for which there was a payment default during the three months ended March 31, 2018 and 2017. A default for purposes of this disclosure is a TDR loan in which the borrower is 90 days past due or results in the foreclosure and repossession of the applicable collateral.

Interest income recorded during the three months ended March 31, 2018 and 2017 on TDR loans and interest income that would have been recorded had the terms of the loans not been modified was minimal.

The Company has not committed to lend additional amounts to customers with outstanding loans classified as TDRs as of March 31, 2018 or December 31, 2017.

Credit Quality Indicators

From a credit risk standpoint, the Company classifies its loans in one of the following categories: (i) pass, (ii) special mention, (iii) substandard or (iv) doubtful. Loans classified as loss are charged-off. Loans not rated special mention, substandard, doubtful, or loss are classified as pass loans.

The classifications of loans reflect a judgment about the risks of default and loss associated with the loan. The Company reviews the ratings on criticized credits monthly. Ratings are adjusted to reflect the degree of risk and loss that is felt to be inherent in each credit as of each monthly reporting period. All classified credits are evaluated for impairments. If impairment is determined to exist, a specific reserve is established. The Company’s methodology is structured so that specific reserves are increased in accordance with deterioration in credit quality (and a corresponding increase in risk and loss) or decreased in accordance with improvement in credit quality (and a corresponding decrease in risk and loss).

Credits rated special mention show clear signs of financial weaknesses or deterioration in credit worthiness, however, such concerns are not so pronounced that the Company generally expects to experience significant loss within the short-term. Such credits typically maintain the ability to perform within standard credit terms and credit exposure is not as prominent as credits with a lower rating.

Credits rated substandard are those in which the normal repayment of principal and interest may be, or has been, jeopardized by reason of adverse trends or developments of a financial, managerial, economic or political nature, or important weaknesses which exist in collateral. A protracted workout on these credits is a distinct possibility. Prompt corrective action is therefore required to strengthen the Company’s position, and/or to reduce exposure and to assure that adequate remedial measures are taken by the borrower. Credit exposure becomes more likely in such credits and a serious evaluation of the secondary support to the credit is performed.

Credits rated doubtful are those in which full collection of principal appears highly questionable, and in which some degree of loss is anticipated, even though the ultimate amount of loss may not yet be certain and/or other factors exist which could affect collection of debt. Based upon available information, positive action by the Company is required to avert or minimize loss. Credits rated doubtful are generally also placed on non-accrual.

Credits classified as PCI are those that, at acquisition date, had the characteristics of substandard loans and it was probable, at acquisition, that all contractually required principal and interest payments would not be collected. The Company evaluates these loans on a projected cash flow basis with this evaluation performed quarterly.

The following tables summarize the Company’s internal ratings of its loans, including PCI loans, as of March 31, 2018 and December 31, 2017:



	March 31, 2018
	Pass		Special Mention		Substandard		Doubtful		PCI		Total
Real estate:
Construction and land	$	297,572	$	682	$	2,769	$	—	$	—	$	301,023
Farmland	9,328		—		—		—		38		9,366
1 - 4 family residential	246,103		410		197		—		96		246,806
Multi-family residential	122,482		—		—		—		—		122,482
Commercial Real Estate	929,170		8,608		762		—		17,001		955,541
Commercial	629,792		17,039		1,174		—		24,815		672,820
Consumer	7,952		—		99		—		—		8,051
Total	$	2,242,399	$	26,739	$	5,001	$	—	$	41,950	$	2,316,089



	December 31, 2017⁽¹⁾
	Pass		Special Mention		Substandard		Doubtful		PCI		Total
Real estate:
Construction and land	$	277,186	$	639	$	—	$	—	$	—	$	277,825
Farmland	9,336		—		—		—		49		9,385
1 - 4 family residential	235,781		462		200		—		99		236,542
Multi-family residential	106,275		—		—		—		—		106,275
Commercial Real Estate	882,523		8,771		681		—		17,317		909,292
Commercial	634,796		18,337		1,155		116		30,147		684,551
Consumer	9,540		—		108		—		—		9,648
Total	$	2,155,437	$	28,209	$	2,144	$	116	$	47,612	$	2,233,518

(1) To conform to the current period presentation, $15,123 was reclassified from 1-4 family residential to multi-family residential within the pass column. There were no reclassifications between internal rating buckets.

An analysis of the allowance for loan losses for the three months ended March 31, 2018 and 2017 and year ended December 31, 2017 is as follows:



	Three Months Ended March 31, 2018			Year Ended December 31, 2017			Three Months Ended March 31, 2017
Balance at beginning of period	$	12,808		$	8,524		$	8,524
Provision charged to earnings	678			5,114			890
Charge-offs	(94		)	(839		)	(603		)
Recoveries	9			9			5
Net charge-offs	(85		)	(830		)	(598		)
Balance at end of period	$	13,401		$	12,808		$	8,816

The allowance for loan losses as a percentage of total loans was 0.58%, 0.57% and 0.86% as of March 31, 2018, December 31, 2017, and March 31, 2017, respectively.

The following tables summarize the activity in the allowance for loan losses by portfolio segment for the periods indicated:



	For the Three Months Ended March 31, 2018
	Real Estate
	Construction, Land and Farmland		Residential		Commercial Real Estate		Commercial			Consumer		Total
Balance at beginning of period	$	1,315	$	1,473	$	4,410	$	5,588		$	22	$	12,808
Provision (recapture) charged to earnings	111		117		552		(102		)	—		678
Charge-offs	—		—		—		(94		)	—		(94		)
Recoveries	—		—		—		9			—		9
Net charge-offs (recoveries)	—		—		—		(85		)	—		(85		)
Balance at end of period	$	1,426	$	1,590	$	4,962	$	5,401		$	22	$	13,401
Period-end amount allocated to:
Specific reserves:	—		—		—		66			—		66
General reserves	1,426		1,590		4,962		5,335			22		13,335
Total	$	1,426	$	1,590	$	4,962	$	5,401		$	22	$	13,401



	For the Year Ended December 31, 2017
	Real Estate
	Construction, Land and Farmland			Residential			Commercial Real Estate		Commercial			Consumer			Total
Balance at beginning of period	$	1,415		$	1,116		$	3,003	$	2,955		$	35		$	8,524
Provision (recapture) charged to earnings	(100		)	368			1,407		3,452			(13		)	5,114
Charge-offs	—			(11		)	—		(828		)	—			(839		)
Recoveries	—			—			—		9			—			9
Net charge-offs (recoveries)	—			(11		)	—		(819		)	—			(830		)
Balance at end of period	$	1,315		$	1,473		$	4,410	$	5,588		$	22		$	12,808
Period-end amount allocated to:
Specific reserves:	—			—			—		12			—			12
General reserves	1,315			1,473			4,410		5,576			22			12,796
Total	$	1,315		$	1,473		$	4,410	$	5,588		$	22		$	12,808



	For the Three Months Ended March 31, 2017
	Real Estate
	Construction, Land and Farmland			Residential		Commercial Real Estate		Commercial			Consumer			Total
Balance at beginning of year	$	1,415		$	1,116	$	3,003	$	2,955		$	35		$	8,524
Provision (recapture) charged to earnings	(114		)	38		28		939			(1		)	890
Charge-offs	—			—		—		(603		)	—			(603		)
Recoveries	—			—		—		5			—			5
Net charge-offs (recoveries)	—			—		—		(598		)	—			(598		)
Balance at end of period	$	1,301		$	1,154	$	3,031	$	3,296		$	34		$	8,816
Period-end amount allocated to:
Specific reserves:	—			—		—		133			3			136
General reserves	1,301			1,154		3,031		3,163			31			8,680
Total	$	1,301		$	1,154	$	3,031	$	3,296		$	34		$	8,816

The Company’s recorded investment in loans as of March 31, 2018 and December 31, 2017 related to the balance in the allowance for loan losses on the basis of the Company’s impairment methodology is as follows:



	March 31, 2018
	Real Estate
	Construction, Land and Farmland		Residential		Commercial Real Estate		Commercial		Consumer		Total
Loans individually evaluated for impairment	$	2,769	$	161	$	429	$	605	$	74	$	4,038
Loans collectively evaluated for impairment	307,582		369,031		938,111		647,400		7,977		2,270,101
PCI loans	38		96		17,001		24,815		—		41,950
Total	$	310,389	$	369,288	$	955,541	$	672,820	$	8,051	$	2,316,089



	December 31, 2017
	Real Estate
	Construction, Land and Farmland		Residential		Commercial Real Estate		Commercial		Consumer		Total
Loans individually evaluated for impairment	$	—	$	161	$	434	$	398	$	75	$	1,068
Loans collectively evaluated for impairment	287,161		342,557		891,541		654,006		9,573		2,184,838
PCI loans	49		99		17,317		30,147		—		47,612
Total	$	287,210	$	342,817	$	909,292	$	684,551	$	9,648	$	2,233,518

Loans acquired with evidence of credit quality deterioration at acquisition, for which it was probable that the Company would not be able to collect all contractual amounts due, were accounted for as PCI loans. The carrying amount of PCI loans included in the condensed consolidated balance sheets and the related outstanding balances at March 31, 2018 and December 31, 2017 are set forth in the table below. The outstanding balance represents the total amount owed, including accrued but unpaid interest, and any amounts previously charged off.



	March 31, 2018		December 31, 2017
Carrying amount	$	41,950	$	47,612
Outstanding balance	54,690		63,940

Changes in the accretable yield for PCI loans for the three months ended March 31, 2018 are included in table below. There was no accretable yield balance for PCI loans for the three months ended March 31, 2017.



	Three Months Ended March 31, 2018
Balance at beginning of period	$	2,723
Purchase accounting adjustments	1,414
Reclassifications from nonaccretable	5,870
Accretion	(1,868		)
Balance at end of period	$	8,139

Servicing Assets

The Company was servicing loans of approximately $74,946 and $38,671 as of March 31, 2018 and 2017, respectively. A summary of the changes in the related servicing assets are as follows:



	Three Months Ended March 31,
	2018			2017
Balance at beginning of period	$	1,215		$	601
Increase from loan sales	92			137
Amortization charged to income	(102		)	(56		)
Balance at end of period	$	1,205		$	682

The estimated fair value of the servicing assets approximated the carrying amount at March 31, 2018, December 31, 2017, and March 31, 2017. Fair value is estimated by discounting estimated future cash flows from the servicing assets using discount rates that approximate current market rates over the expected lives of the loans being serviced. A valuation allowance is recorded when the fair value is below the carrying amount of the asset. As of March 31, 2018 and 2017, there was no valuation allowance recorded.

The Company may also receive a portion of subsequent interest collections on loans sold that exceed the contractual servicing fee. In that case, the Company records an interest-only strip based on its relative fair market value and the other components of the loans. There was no interest-only strip receivable recorded at March 31, 2018 and December 31, 2017.

- Definition

The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses.

+ References + Details

Income Taxes	3 Months Ended
Income Taxes	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company’s estimated annual effective tax rate, before the net impact of discrete items, was approximately 20.5% and 34.2% for the three months ended March 31, 2018 and 2017, respectively. The Company’s effective tax rate, after including the net impact of discrete tax items, was approximately 25.3% and 30.4%, respectively, for the three months ended March 31, 2018 and 2017. The decrease in the effective tax rate was primarily due to the enactment of the Tax Cuts and Jobs Act (the “Tax Act”) on December 22, 2017 which lowered our federal statutory tax rate, effective on January 1, 2018. Authoritative guidance and interpretation by regulatory bodies is ongoing and as such, the accounting for the effects of the Tax Act is not final and the full impact of the new regulation is still being evaluated. The Company’s provision for the three months ended March 31, 2018 was primarily impacted by the re-measurement of the Company’s deferred taxes of $820 related to changes made to recorded provisional estimates for the Sovereign Bancshares, Inc. (“Sovereign”) and Liberty Bancshares, Inc. (“Liberty”) acquisitions that were updated based on information obtained during the three months ended March 31, 2018. The tax re-measurement impact was partially offset by the recognition of excess tax benefits on share-based payment awards. Deferred income taxes reflect the net tax effects of temporary differences between the recorded amounts of assets and liabilities for financial reporting purposes, and the amounts used for income tax purposes. Included in the accompanying condensed consolidated balance sheet as of March 31, 2018 is a current tax receivable of approximately $4,048 and a net deferred tax asset of approximately $6,681 in other assets. Included in the accompanying condensed consolidated balance sheets as of December 31, 2017 is a current tax receivable of $7,085 and a net deferred tax asset of $4,937 in other assets. The Company also has a deferred tax liability of $327 classified as branch liabilities held for sale in the accompanying condensed consolidated sheets as of December 31, 2017. See Note 14 - Branch Assets and Liabilities Held for Sale for additional information.

Commitments and Contingencies

3 Months Ended

Mar. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Litigation

The Company may from time to time be involved in legal actions arising from normal business activities. Management believes that these actions are without merit or that the ultimate liability, if any, resulting from them will not materially affect the financial position or results of operations of the Company.

Lessee: Cease-Use Liability

As part of the Sovereign acquisition and the Company’s evaluation of its acquired facilities owned or leased for ongoing economic benefit, a decision was made to cease using two acquired leases in the fourth quarter of 2017 for leases that expire between 2026 and 2029. In accordance with accounting for exit and disposal activities, the Company recognized a liability in 2017 for lease exit costs incurred when it no longer derived economic benefits from the related leases. In January 2018, the Company entered into an assignment agreement to assign one of our branch leases to a third party for one of the two leases that the Company ceased using during 2017. As a result of the lease assignment, the Company reversed $669 of the cease-use liability during the three months ended March 31, 2018.

A cease-use liability of $703 and $1,407 is included in accrued interest payable and other liabilities in the condensed consolidated balance sheets as of March 31, 2018 and December 31, 2017, respectively. The below table is a roll-forward of the cease-use liability from December 31, 2017 to March 31, 2018.



	Cease-Use Liability
Balance as of December 31, 2017	$	1,407
Payments	(35		)
Reversal upon lease assignment	(669		)
Balance as of March 31, 2018	$	703

Qualified Affordable Housing Investment

On July 26, 2017, the Company began investing in a qualified housing project. As of March 31, 2018 and December 31, 2017, the balance of the investment for qualified affordable housing projects was $1,938 and $1,982, respectively. This balance is reflected in non-marketable equity securities on the condensed consolidated balance sheets. The total unfunded commitment related to the investment in a qualified housing project totaled $1,652 and $1,765 as of March 31, 2018 and December 31, 2017, respectively. The Company expects to fulfill this commitment during the year ending 2031.

Fair Value Disclosures

3 Months Ended

Mar. 31, 2018

Fair Value Disclosures [Abstract]

Fair Value Disclosures

The following table summarizes assets measured at fair value on a recurring basis as of March 31, 2018 and December 31, 2017, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value:



	Fair Value Measurements Using
	Level 1 Inputs		Level 2 Inputs		Level 3 Inputs		Total Fair Value
As of March 31, 2018
Investment securities available for sale	$	—	$	243,164	$	—	$	243,164
As of December 31, 2017
Investment securities available for sale	$	—	$	228,117	$	—	$	228,117

There were no liabilities measured at fair value on a recurring basis as of March 31, 2018 or December 31, 2017.

There were no transfers between Level 2 and Level 3 during the three months ended March 31, 2018 and 2017.

The following table summarizes assets measured at fair value on a non-recurring basis as of March 31, 2018 and December 31, 2017, segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value:



	Fair Value Measurements Using
	Level 1 Inputs		Level 2 Inputs		Level 3 Inputs		Total Fair Value
As of March 31, 2018
Assets:
Impaired loans	$	—	$	—	$	259	$	259
Other real estate owned	$	—	$	—	$	10	$	10
As of December 31, 2017
Assets:
Impaired loans	$	—	$	—	$	116	$	116
Other real estate owned	$	—	$	—	$	449	$	449

At March 31, 2018, impaired loans had a carrying value of $259, with $66 specific allowance for loan loss allocated. At December 31, 2017, impaired loans had a carrying value of $116, with $12 specific allowance for loan loss allocated.

There were no liabilities measured at fair value on a non-recurring basis as of March 31, 2018 or December 31, 2017.

For Level 3 financial assets measured at fair value as of March 31, 2018 and December 31, 2017, the significant unobservable inputs used in the fair value measurements were as follows:



March 31, 2018
			Valuation	Unobservable	Weighted
Assets/Liabilities	Fair Value		Technique	Input(s)	Average
Impaired loans	$	259	Collateral Method	Adjustments for selling costs	8	%
Other real estate owned	$	10	Collateral Method	Adjustments for selling costs	8	%



December 31, 2017
			Valuation	Unobservable	Weighted
Assets/Liabilities	Fair Value		Technique	Input(s)	Average
Impaired loans	$	116	Collateral Method	Adjustments for selling costs	8	%
Other real estate owned	$	449	Collateral Method	Adjustments for selling costs	8	%

Fair Value of Financial Instruments

Please refer to Note 16 of the Company’s 2017 Annual Report on Form 10-K for our methods of determining the fair value of financial instruments presented in this note. The methods are consistent with our methodologies disclosed in the Company’s 2017 Annual Report on Form 10-K, except for the valuation of loans which was impact by the adoption of ASU 2016-01. In accordance with ASU 2016-01, the fair value of loans, excluding previously presented impaired loans measured at fair value on a non-recurring basis, is estimated using a discounted cash flow analyses. The discount rates used to determine fair value use interest rate spreads that reflect factors such as liquidity, credit, and prepayment risk of the loans. Loans are considered a Level 3 classification.

As of March 31, 2018, branch assets held for sale is solely comprised of bank premises, furniture and equipment with its fair value determined based on a third party appraisal of similar properties. As of December 31, 2017, branch assets held for sale included loans, accrued interest, bank premises, furniture and equipment, intangible assets and the cash balances related to branches that were held for sale. The carrying amount of cash and cash equivalents, accrued interest and intangible assets approximated their fair value. The fair value of the bank premises, furniture and equipment was determined based on third party appraisals of similar properties. The fair value of the loans held for sale was estimated using discounted cash flow analysis, using interest rates currently being offered for loans with similar terms to borrowers of similar credit quality. See Note 14 - Branch Assets and Liabilities Held for Sale for for additional information.

The estimated fair values and carrying values of all financial instruments under current authoritative guidance as of March 31, 2018 and December 31, 2017 were as follows:



			Fair Value
	Carrying Amount		Level 1		Level 2		Level 3
March 31, 2018
Financial assets:
Cash and cash equivalents	$	195,194	$	—	$	195,194	$	—
Loans held for sale	893		—		893		—
Loans, net	2,302,664		—		—		2,316,438
Accrued interest receivable	7,127		—		7,127		—
Bank-owned life insurance	21,620		—		21,620		—
Servicing asset	1,205		—		1,205		—
Non-marketable equity securities	20,806		—		20,806		—
Financial instruments, assets held for sale	1,753		—		1,753		—
Financial liabilities:
Deposits	$	2,493,794	$	—	$	2,425,559	$	—
Advances from FHLB	48,128		—		48,173		—
Accrued interest payable	471		—		471		—
Junior subordinated debentures	11,702		—		11,702		—
Subordinated notes	4,988		—		4,988		—
December 31, 2017
Financial assets:
Cash and cash equivalents	$	149,044	$	—	$	149,044	$	—
Loans held for sale	841		—		841		—
Loans, net	2,220,682		—				2,234,094
Accrued interest receivable	7,676		—		7,676		—
Bank-owned life insurance	21,476		—		21,476		—
Servicing asset	1,243		—		1,243		—
Non-marketable equity securities	13,732		—		13,732		—
Financial instruments, assets held for sale	31,828				5,515		26,313
Financial liabilities:
Deposits	$	2,278,630	$	—	$	2,164,498	$	—
Advances from FHLB	71,164		—		70,110		—
Accrued interest payable	445		—		445		—
Junior subordinated debentures	11,702		—		11,702		—
Subordinated notes	4,987		—		4,987		—
Other borrowings	15,000		—		15,000		—
Financial instruments, liabilities held for sale	64,300		—		64,300		—

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Financial Instruments with Off-Balance Sheet Risk

3 Months Ended

Mar. 31, 2018

Fair Value Disclosures [Abstract]

Financial Instruments with Off-Balance Sheet Risk

The Company is a party to financial instruments with off-balance sheet risk in the normal course of business to meet the financing needs of its customers. These financial instruments include commitments to extend credit and standby letters of credit. Those instruments involve, to varying degrees, elements of credit risk in excess of the amount recognized in the condensed consolidated balance sheets.

The Company’s exposure to credit loss in the event of nonperformance by the other party to the financial instrument for commitments to extend credit and standby letters of credit is represented by the contractual amount of those instruments. The Company uses the same credit policies in making commitments and conditional obligations as it does for on balance sheet instruments.

The following table sets forth the approximate amounts of these financial instruments as of March 31, 2018 and December 31, 2017:



	March 31,		December 31,
	2018		2017
Commitments to extend credit	$	625,590	$	606,451
Standby and commercial letters of credit	10,147		9,299
	$	635,737	$	615,750

Commitments to extend credit are agreements to lend to a customer as long as there is no violation of any condition established in the contract. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. Since many of the commitments may expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. Management evaluates each customer’s creditworthiness on a case-by-case basis. The amount of collateral obtained, if deemed necessary upon extension of credit, is based on management’s credit evaluation of the borrower.

Standby letters of credit are conditional commitments issued by the Company to guarantee the performance of a customer to a third party. Standby letters of credit generally have fixed expiration dates or other termination clauses and may require payment of a fee. The credit risk involved in issuing letters of credit is essentially the same as that involved in extending loan facilities to customers. The Company’s policy for obtaining collateral and the nature of such collateral is essentially the same as that involved in making commitments to extend credit.

Although the maximum exposure to loss is the amount of such commitments, management currently anticipates no material losses from such activities.

Stock and Incentive Plans

3 Months Ended

Mar. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock and Incentive Plans

2010 Stock Option and Equity Incentive Plan

During the three months ended March 31, 2018 and 2017, the Company did not award any restricted stock units, non-performance based stock options or performance-based stock options under the 2010 Incentive Plan. Stock compensation expense related to the 2010 Incentive Plan recognized in the accompanying condensed consolidated statements of income totaled $5 and $22 for the three months ended March 31, 2018 and 2017, respectively.

A summary of option activity under the 2010 Incentive Plan for the three months ended March 31, 2018 and 2017, and changes during the period then ended is presented below:



	2010 Incentive Plan
	Non-Performance Based Stock Options
	Shares Underlying Options		Weighted Exercise Price		Weighted Average Contractual Term	Aggregate Intrinsic Value
Outstanding at January 1, 2017	325,500		$	10.15	4.56 years
Exercised	(15,000	)	10.00
Outstanding at March 31, 2017	310,500		$	10.16	4.34 years

Outstanding at January 1, 2018	305,000		$	10.16	3.59 years
Exercised	(9,000	)	10.38			156
Outstanding at March 31, 2018	296,000		$	10.16	3.31 years	$	5,183
Options exercisable at March 31, 2018	290,000		$	10.12	3.25 years	$	5,091

As of March 31, 2018, December 31, 2017 and March 31, 2017, there was approximately $7, $8 and $18, respectively, of unrecognized compensation expense related to non-performance based stock options. The unrecognized compensation expense at March 31, 2018 is expected to be recognized over the remaining weighted average requisite service period of 1.02 years.

A summary of the status of the Company’s restricted stock units under the 2010 Incentive Plan as of March 31, 2018 and 2017, and changes during the three months then ended is as follows:



	2010 Incentive Plan
	Units		Weighted Average Grant Date Fair Value
Outstanding at January 1, 2017	27,750		$	11.92
Vested	(1,000	)	10.85
Outstanding at March 31, 2017	26,750		$	11.96

Outstanding at January 1, 2018	24,250		$	13.19
Vested into shares	(8,750	)	10.85
Forfeited	(500	)	10.85
Outstanding at March 31, 2018	15,000		$	14.99

As of March 31, 2018, December 31, 2017 and March 31, 2017 there was $12, $15 and $71 of total unrecognized compensation expense related to nonvested restricted stock units.

A summary of the fair value of the Company’s stock options exercised and restricted stock units vested under the 2010 Incentive Plan as of March 31, 2018 and 2017 is presented below:

2014 Omnibus Plan

During the three months ended March 31, 2018, the Company awarded 34,500 non-performance restricted stock units, 40,269 performance based restricted stock units, and 112,593 non-performance based stock options under the 2014 Omnibus Plan. During the three months ended March 31, 2017, the Company awarded 22,500 non-performance based restricted stock units, and 25,522 performance based restricted stock units, and 55,440 non-performance-based stock options under the 2014 Omnibus Plan.

The non-performance options granted during the three months ended March 31, 2018 vest equally over three years from the grant date. The performance based restricted stock units granted during the three months ended March 31, 2018 include a performance criteria based on the Company’s total shareholder return relative to a market index that determines the number of restricted stock units that may vest equally over a three-year period from the date of grant. The non-performance restricted stock units granted during the three months ended March 31, 2018 vest equally over a three-year period from the date of grant.

For the three months ended March 31, 2018 and 2017, compensation expense for option and restricted stock unit awards granted under the 2014 Omnibus Plan was approximately $766 and $375, respectively.

The fair value of each option award is estimated on the grant date using the Black-Scholes option-pricing model with the following assumptions used for the grants for the three months ended March 31, 2018 and 2017:



	For the Three Months Ended March 31,
	2018	2017
Dividend yield	0.00%	0.00%
Expected life	5.0 to 7.5 years	5.0 to 7.5 years
Expected volatility	27.87% to 37.55%	32.82% to 37.55%
Risk-free interest rate	1.06% to 2.73%	1.06% to 2.32%

The expected life is based on the amount of time that options granted are expected to be outstanding. The dividend yield assumption is based on the Company’s history. The expected volatility is based on historical volatility of the Company as well as the volatility of certain comparable public company peers. The risk-free interest rates are based upon yields of U.S. Treasury issues with a term equal to the expected life of the option being valued.

A summary of the status of the Company’s stock options under the 2014 Omnibus Plan as of March 31, 2018 and 2017, and changes during the three months ended is as follows:



	2014 Omnibus Plan
	Non-performance Based Stock Options
	Shares Underlying Options		Weighted Exercise Price		Weighted Average Contractual Term	Aggregate Intrinsic Value
Outstanding at January 1, 2017	128,366		$	15.32	8.69 years
Granted	55,440		26.92
Outstanding at March 31, 2017	183,806		$	18.82	8.85 years

Outstanding at January 1, 2018	332,706		$	22.71	8.86 years	$	1,614
Granted	112,593		27.63
Exercised	(1,983	)	14.95			25
Outstanding at March 31, 2018	443,316		$	23.95	8.89 years	$	1,629
Options exercisable at March 31, 2018	104,396		$	17.21	7.56 years	$	1,092
Weighted average fair value of options granted during the period			$	9.38

As of March 31, 2018 and December 31, 2017 there was $2,806 and $1,958 of total unrecognized compensation expense related to options awarded under the 2014 Omnibus Plan, respectively. The unrecognized compensation expense at March 31, 2018 is expected to be recognized over the remaining weighted average requisite service period of 2.68 years.

A summary of the status of the Company’s non-performance based restricted stock units under the 2014 Omnibus Plan as of March 31, 2018 and 2017, and changes during the three months ended is as follows:



	2014 Omnibus Plan
	Non-performance Based
	Restricted Stock Units
	Units		Weighted Average Grant Date Fair Value
Outstanding at January 1, 2017	67,956		$	13.79
Granted	22,500		27.84
Vested into shares	(5,350	)	4.38
Outstanding at March 31, 2017	85,106		$	18.09

Outstanding at January 1, 2018	150,722		$	13.29
Granted	34,500		28.05
Vested into shares	(8,399	)	25.13
Outstanding at March 31, 2018	176,823		$	15.61

A summary of the status of the Company’s performance based restricted stock units under the 2014 Omnibus Plan as of March 31, 2018 and 2017, and changes during the three months ended is as follows:



	2014 Omnibus Plan
	Performance Based
	Restricted Stock Units
	Units		Weighted Average Grant Date Fair Value
Outstanding at January 1, 2017	51,197		$	8.72
Granted	25,522		24.34
Vested into shares	(19,861	)	15.34
Outstanding at March 31, 2017	56,858		$	13.42

Outstanding at January 1, 2018	53,594		$	8.72
Granted	40,269		27.59
Vested into shares	(26,623	)	18.83
Outstanding at March 31, 2018	67,240		$	16.01

As of March 31, 2018, December 31, 2017 and March 31, 2017 there was $5,097, $3,592 and $2,058 of total unrecognized compensation related to restricted stock units awarded under the 2014 Omnibus Plan, respectively.

A summary of the fair value of the Company’s stock options exercised and restricted stock units vested under the 2014 Omnibus Plan as of March 31, 2018 and 2017 is presented below:



	Fair Value of Options Exercised or Restricted Stock Units Vested as of March 31,
	2018	2017
Non-performance based stock options exercised	54	—
Non-performance based restricted stock units vested	745	530
Performance based restricted stock units vested	234	150

Significant Concentrations of Credit Risk	3 Months Ended
Significant Concentrations of Credit Risk	Mar. 31, 2018
Risks and Uncertainties [Abstract]
Significant Concentrations of Credit Risk	Significant Concentrations of Credit Risk Most of the Company’s business activity is with customers located within the Dallas-Fort Worth metroplex and Houston metropolitan area. Such customers are normally also depositors of the Company. The distribution of commitments to extend credit approximates the distribution of loans outstanding. Commercial and standby letters of credit were granted primarily to commercial borrowers. The contractual amounts of credit related financial instruments such as commitments to extend credit, credit card arrangements, and letters of credit represent the amounts of potential accounting loss should the contract be fully drawn upon, the customer default, and the value of any existing collateral become worthless.

Capital Requirements and Restrictions on Retained Earnings

3 Months Ended

Mar. 31, 2018

Banking and Thrift [Abstract]

Capital Requirements and Restrictions on Retained Earnings

Under U.S. banking law, there are legal restrictions limiting the amount of dividends the Company can declare. Approval of the regulatory authorities is required if the effect of the dividends declared would cause regulatory capital of the Company to fall below specified minimum levels.

The Company on a consolidated basis and the Bank are subject to various regulatory capital requirements administered by federal banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory and possibly additional discretionary actions by regulators that, if undertaken, could have a direct material effect on the Company’s financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Company must meet specific capital guidelines that involve quantitative measures of the Company’s assets, liabilities, and certain off balance sheet items as calculated under regulatory accounting practices. The Company’s capital amounts and classification are also subject to qualitative judgments by the regulators about components, risk weightings, and other factors.

In July 2013, the Federal Reserve published final rules for the adoption of the Basel III regulatory capital framework (the “Basel III Capital Rules”). The Basel III Capital Rules, among other things, (i) introduce a new capital measure called “Common Equity Tier 1” (“CET1”), (ii) specify that Tier 1 capital consist of Common Equity Tier 1 and “Additional Tier 1 Capital” instruments meeting specified requirements, (iii) define Common Equity Tier 1 narrowly by requiring that most deductions/adjustments to regulatory capital measures be made to Common Equity Tier 1 and not to the other components of capital and (iv) expand the scope of the deductions/adjustments as compared to existing regulations. The Basel III Capital Rules became effective for the Company on January 1, 2015 with certain transition provisions to be fully phased in by January 1, 2019.

Starting in January 2016, the implementation of the capital conservation buffer became effective for the Company starting at the 0.625% level and increasing 0.625% each year thereafter, until it reaches 2.5% on January 1, 2019. The capital conservation buffer is designed to absorb losses during periods of economic stress and effectively increases the minimum required risk-weighted capital ratios. Failure to meet the full amount of the buffer will result in restrictions on the Company’s ability to make capital distributions, including dividend payments and stock repurchases, and to pay discretionary bonuses to executive officers.

Quantitative measures established by regulation to ensure capital adequacy require the Company and the Bank to maintain minimum amounts and ratios (set forth in the table below) of total, CET1 and Tier 1 capital (as defined in the regulations) to risk weighted assets (as defined), and of Tier 1 capital (as defined) to average assets (as defined). Management believes, as of March 31, 2018 and December 31, 2017 that the Company and the Bank met all capital adequacy requirements to which they were subject.

As of March 31, 2018 and December 31, 2017, the Company’s and the Bank’s capital ratios exceeded those levels necessary to be categorized as “well capitalized” under the regulatory framework for prompt corrective action. To be categorized as “well capitalized,” the Company and the Bank must maintain minimum total risk-based, CET1, Tier 1 risk-based and Tier 1 leverage ratios as set forth in the table. There are no conditions or events since March 31, 2018 that management believes have changed the Company’s categorization as “well capitalized.”

A comparison of the Company’s and Bank’s actual capital amounts and ratios to required capital amounts and ratios is presented in the following table:



	Actual				For Capital Adequacy Purposes				To Be Well Capitalized Under Prompt Corrective Action Provisions
	Amount		Ratio		Amount		Ratio		Amount		Ratio
As of March 31, 2018
Total capital (to risk-weighted assets)
Company	$	351,078	13.17	%	$	213,259	8.0	%	n/a		n/a
Bank	305,561		11.45	%	213,492		8.0	%	$	266,866	10.0	%
Tier 1 capital (to risk-weighted assets)
Company	332,690		12.48	%	159,947		6.0	%	n/a		n/a
Bank	292,160		10.94	%	160,234		6.0	%	213,645		8.0
Common equity tier 1 to risk-weighted assets
Company	320,987		12.04	%	119,970		4.5	%	n/a		n/a
Bank	292,160		10.94	%	120,176		4.5	%	173,587		6.5
Tier 1 capital (to average assets)
Company	332,690		11.84	%	112,395		4.0	%	n/a		n/a
Bank	292,160		10.39	%	112,477		4.0	%	140,597		5.0
As of December 31, 2017
Total capital (to risk-weighted assets)
Company	$	342,521	13.16	%	$	208,219	8.0	%	n/a		n/a
Bank	296,207		11.37	%	208,413		8.0	%	$	260,516	10.0	%
Tier 1 capital (to risk-weighted assets)
Company	324,726		12.48	%	156,118		6.0	%	n/a		n/a
Bank	283,399		10.88	%	156,286		6.0	%	208,382		8.0
Common equity tier 1 to risk-weighted assets
Company	313,024		12.03	%	11,791		4.5	%	n/a		n/a
Bank	283,399		10.88	%	117,215		4.5	%	169,310		6.5
Tier 1 capital (to average assets)
Company	324,726		12.92	%	100,534		4.0	%	n/a		n/a
Bank	283,399		11.28	%	100,496		4.0	%	125,620		5.0

- Definition

The entire disclosure for banks, savings institutions, and credit unions, for regulatory capital requirements imposed by the Federal Reserve System (FRB), the Federal Deposit Insurance Corporation (FDIC), the Office of Thrift Supervision (OTS) or for any state imposed capital requirements, as applicable. The disclosure may include (1) a description of regulatory capital requirements (a) for capital adequacy purposes and (b) established by the prompt corrective action provisions of Section 38 of the Federal Depository Insurance Act; (2) the actual or possible material effects of noncompliance with such requirements; (3) whether the entity is in compliance with the regulatory capital requirements including (a) required and actual ratios and amounts of Tier 1 leverage, Tier 1 risk-based, and total risk-based capital, tangible capital (for savings institutions), and Tier 3 capital for market risk (for certain banks and bank holding companies), (b) factors that may significantly affect capital adequacy; (4) the prompt corrective action category in which the entity was classified as of its most recent notification; (5) whether management believes any conditions or events since notification have changed the entity's category. Also may include additional information that might be disclosed in situations where substantial doubt about the entity's ability to continue as a going concern for a reasonable period of time.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1G
-URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958577-112826

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1C
-URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958572-112826

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1E
-URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958574-112826

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1H
-URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958569-112826

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958570-112826

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1F
-URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958575-112826

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1D
-URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958573-112826

+ Details

Business Combinations

3 Months Ended

Mar. 31, 2018

Business Combinations [Abstract]

Business Combinations

All acquisitions were accounted for using the acquisition method of accounting. Accordingly, the assets and liabilities of the acquired entities were recorded at their estimated fair values at the acquisition date. ASC 820 defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market willing participants at the measurement date. The Company determines the estimated fair values after review and consideration of relevant information, including discounted cash flows, quoted market prices, third party valuations, and estimates made by management. The excess of the purchase price over the estimated fair value of the net assets for tax-free acquisitions is recorded as goodwill, none of which is deductible for tax purposes. Acquisition-related costs are recognized separately from the acquisition and are expensed as incurred. The results of operations for each acquisition have been included in the Company’s consolidated financial results beginning on the respective acquisition date.

Sovereign Bancshares, Inc.

On August 1, 2017, the Company acquired Sovereign, a Texas corporation and parent company of Sovereign Bank. The Company issued 5,117,642 shares of its common stock and paid out $56,215 in cash to Sovereign in consideration for the acquisition. Additionally, under the terms of the merger agreement, each share of Sovereign SBLF Preferred Stock, no par value, issued and outstanding immediately prior to the effective time was converted into one share of Veritex Series D Preferred Stock.

The business combination was accounted for under the acquisition method of accounting. Under this method of accounting, assets acquired and liabilities assumed are recorded at their estimated fair values. The excess cost over fair value of net assets acquired is recorded as goodwill. As the consideration paid for Sovereign exceeded the provisional value of the net assets acquired, goodwill of $111,301 was recorded related to the acquisition. This goodwill resulted from the combination of expected operational synergies and increased market share in the Dallas-Fort Worth metroplex and Houston metropolitan area. Goodwill is not tax deductible.

Fair Value

The following table presents the amounts recorded on the condensed consolidated balance sheets on the acquisition date of August 1, 2017, showing the estimated fair value as reported at December 31, 2017 and the revised final fair value at March 31, 2018.



	Initial Estimate		Adjustments			Revised Final Fair Value
Assets
Cash and cash equivalents	$	44,775	$	—		$	44,775
Investment securities	166,307		—			166,307
Loans	752,450		(4,622		)	747,828
Accrued interest receivable	3,102		—			3,102
Bank premises, furniture and equipment	17,805		474			18,279
Non-marketable equity securities	6,751		—			6,751
Other real estate owned	282		—			282
Intangible assets	8,454		749			9,203
Goodwill	109,091		2,210			111,301
Other assets	13,148		1,189			14,337
Total Assets	$	1,122,165	$	—		$	1,122,165

Liabilities
Deposits	$	809,366	$	—		$	809,366
Accounts payable and accrued expenses	6,284		—			6,284
Accrued interest payable and other liabilities	806		—			806
Advances from Federal Home Loan Bank	80,000		—			80,000
Junior subordinated debentures	8,609		—			8,609
Total liabilities	$	905,065	$	—		$	905,065

Preferred stock - series D	24,500		—			24,500
Total stockholders’ equity	24,500		—			24,500

Consideration
Market value of common stock issued	$	136,385	$	—		$	136,385
Cash paid	56,215		—			56,215
Total fair value of consideration	$	192,600	$	—		$	192,600

Acquisition-related Expenses

For the three months ended March 31, 2018 and 2017, the Company incurred $0 and $89 , respectively, of pre-tax merger and acquisition expenses related to the Sovereign acquisition. Acquisition expenses are included in professional fees in the condensed consolidated statements of income.

Acquired Loans and Purchased Credit Impaired Loans

Acquired loans were recorded at fair value based on a discounted cash flow valuation methodology that considers, among other things, projected default rates, loss given defaults and recovery rates. No allowance for credit losses was carried over from Sovereign.

The following table discloses the fair value and contractual value of loans acquired from Sovereign on August 1, 2017:



	PCI loans		Other Acquired Loans		Total Acquired Loans
Real Estate	$	17,708	$	518,261	$	535,969
Commercial	29,877		180,730		210,607
Consumer	—		1,252		1,252
Total fair value	47,585		700,243		747,828
Contractual principal balance	$	67,985	$	707,071	$	775,056

The following table presents additional information about PCI loans acquired from Sovereign on August 1, 2017:



	PCI Loans
Contractually required principal and interest	$	85,125
Non-accretable difference	33,064
Cash flows expected to be collected	$	52,061
Accretable difference	4,476
Fair value of PCI loans	$	47,585

Intangible Assets

The following table discloses the fair value of intangible assets acquired from Sovereign on August 1, 2017:



	Gross Intangible Assets
Core deposit intangibles⁽¹⁾	$	8,452
Servicing asset⁽²⁾	317
Intangible lease assets⁽³⁾	434
	$	9,203

⁽¹⁾ The Company estimated a useful life of 7.7 years for core deposit intangibles.

⁽²⁾The Company estimated a weighted-average useful life of 6.1 years for servicing asset which will be amortized on a straight line basis.

⁽³⁾ The Company estimated a weighted-average useful life of 5.0 years for intangible lease assets which will be amortized on a straight line basis

Advances from Federal Home Loan Bank

The Company assumed from Sovereign $80,000 in advances from the Federal Home Loan Bank as of August 1, 2017 that matured in full from August 1, 2017 to December 31, 2017.

Redemption of Veritex Series D Preferred Stock

On August 8, 2017, the Company redeemed all 24,500 shares of the Veritex Series D Preferred Stock at its liquidation value of $1,000 per share plus accrued dividends for a total redemption amount of $24,727. The Company assumed $185 of accrued dividends in connection with the acquisition of Sovereign on August 1, 2017 out of the $227 in dividends paid in 2017. The redemption was approved by the Company’s primary federal regulator and was funded with the Company’s surplus capital. The redemption terminates the Company’s participation in the Small Business Lend Fund (“SBLF”) program.

Liberty Bancshares, Inc.

On December 1, 2017, the Company acquired Liberty, a Texas corporation and parent company of Liberty Bank. The Company issued 1,449,944 shares of its common stock and paid out $25,009 in cash to Liberty in consideration for the acquisition.

The business combination was accounted for under the acquisition method of accounting. As the consideration paid for Liberty exceeded the provisional value of the net assets acquired, goodwill of $23,519 was recorded related to the acquisition. This goodwill resulted from the combination of expected operational synergies and increased market share in Tarrant County. Goodwill is not tax deductible.

Fair Value

The measurement period for the Company to determine the fair values of acquired identifiable assets and assumed liabilities will end at the earlier of (i) twelve months from the date of the acquisition or (ii) as soon as the Company receives the information it was seeking about facts and circumstances that existed as of the acquisition date or learns that more information is not obtainable. Provisional estimates for loans, goodwill, intangible assets, accrued expenses, deposits and deferred taxes have been recorded for the acquisition, as independent valuations have not been finalized. The Company does not expect any significant differences from estimated values upon completion of the valuations. Estimated fair values of the assets acquired and liabilities assumed in this transaction as of the closing date are as follows:



	Initial Estimate		Adjustments			Revised Fair Value
Assets
Cash and cash equivalents	$	57,384	$	—		$	57,384
Investment securities	54,137		—			54,137
Loans	312,608		—			312,608
Accrued interest receivable	1,191		—			1,191
Bank premises, furniture and equipment	6,145		688			6,833
Non-marketable equity securities	2,096		—			2,096
Other real estate owned	166		—			166
Intangible assets	7,519		(1,705		)	5,814
Goodwill	23,496		23			23,519
Other assets	2,509		745			3,254
Total assets	$	467,251	$	—		$	467,002
Liabilities
Deposits	$	395,851	$	(303	)	$	395,548
Accounts payable and accrued expenses	1,287		54			1,341
Accrued interest payable and other liabilities	142		—			142
Subordinated notes⁽¹⁾	4,625		—			4,625
Total liabilities	$	401,905	$	—		$	401,656

Consideration
Market value of common stock issued	$	40,337	$	—		$	40,337
Cash paid	25,009		—			25,009
Total fair value of consideration	$	65,346	$	—		$	65,346

⁽¹⁾The subordinated note was paid off in full on December 1, 2017, subsequent to closing.

Acquisition-related Expenses

For the three months ended March 31, 2018, the Company incurred $335 of pre-tax merger and acquisition expenses related to the Liberty acquisition. The Company incurred no acquisition expenses related to the Liberty acquisition for the three months ended March 31, 2017. Acquisition expenses are included in professional fees in the consolidated statements of income.

Acquired Loans and Purchased Credit Impaired Loans

The Company has identified certain acquired loans as PCI. PCI loan identification considers payment history and past due status, debt service coverage, loan grading, collateral values and other factors that may indicate deterioration of credit quality since origination. Accretion of purchase discounts on PCI loans is based on estimated future cash flows, regardless of contractual maturities, that include undiscounted expected principal and interest payments and use credit risk, interest rate and prepayment risk models to incorporate management’s best estimate of current key assumptions such as default rates, loss severity and payment speeds. Accretion of purchase discounts on acquired non-impaired loans will be recognized on a level-yield basis based on contractual maturity of individual loans per ASC 310-20.

The following table discloses the preliminary fair value and contractual value of loans acquired from Liberty on December 1, 2017:



	PCI loans		Other acquired loans		Total Acquired Loans
Real Estate	$	868	$	257,026	$	257,894
Commercial	307		49,660		49,967
Consumer	—		4,747		4,747
Total fair value	1,175		311,433		312,608
Contractual principal balance	$	1,748	$	316,119	$	317,867

The following table presents additional preliminary information about PCI loans acquired from Liberty on December 1, 2017:



	PCI Loans
Contractually required principal and interest	$	2,316
Non-accretable difference	711
Cash flows expected to be collected	$	1,605
Accretable difference	430
Fair value of PCI loans	$	1,175

Intangible Assets

The acquisition also resulted in a core deposit intangible of $5,814, which will be amortized on an accelerated basis over the estimated life, currently expected to be 10.0 years.

Deferred Taxes Related to Business Combinations

Due to the provisional estimates used for the Liberty acquisition as indicated above, the Company has made a reasonable estimate related to amounts recorded for the re-measurement of deferred taxes acquired in accordance with SAB 118. These estimates may be refined in future periods as the valuation of all assets and liabilities acquired in acquisitions are finalized and recorded.

Intangible Assets and Goodwill

3 Months Ended

Mar. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets and Goodwill

Intangible assets in the accompanying condensed consolidated balance sheets are summarized as follows:



	As of March 31, 2018
	Weighted	Gross					Net
	Amortization	Intangible		Accumulated			Intangible
	Period	Assets		Amortization			Assets
Core deposit intangibles	8.5 years	$	16,051	$	3,081		$	12,970
Servicing asset	5.6 years	1,713		508			1,205
Intangible lease assets	3.1 years	5,281		1,084		—	4,197
		$	23,045	$	4,673		$	18,372



	As of December 31, 2017
	Weighted	Gross				Net
	Amortization	Intangible		Accumulated		Intangible
	Period	Assets		Amortization		Assets
Core deposit intangibles	8.7 years	$	17,007	$	2,694	$	14,313
Servicing asset	6.8 years	1,621		406		1,215
Intangible lease assets	3.3 years	5,281		368		4,913
		$	23,909	$	3,468	$	20,441

For the three months ended March 31, 2018 and March 31, 2017, amortization expense related to intangible assets of approximately $1,205 and $157, respectively, is included within amortization of intangibles, occupancy and equipment, and other income within the condensed consolidated statements of income.

Changes in the carrying amount of goodwill are summarized as follows for the three months ended March 31, 2018:



	March 31, 2018
Beginning of period	$	159,452
Effect of Sovereign acquisition	2,210
Effect of Liberty acquisition	23
End of period	$	161,685

- Definition

The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.

+ References + Details

Branch Assets and Liabilities Held For Sale

3 Months Ended

Mar. 31, 2018

Discontinued Operations and Disposal Groups [Abstract]

Branch Assets and Liabilities Held For Sale

Branch Assets and Liabilities Held for Sale

On October 23, 2017, the Company entered into a Purchase and Assumption Agreement to sell certain assets and liabilities associated with two branch locations in the Austin metropolitan market. On January 1, 2018, the Company completed the sale of these assets and liabilities to Horizon Bank, SSB (“buyer”), resulting in a $33,557 cash settlement payment to the buyer for the three months ended March 31, 2018, which included the repayment of a $1,000 deposit liability recorded within other liabilities as of December 31, 2017, and the recognition of a $355 gain on the sale reported in other non-interest income for the three months ended March 31, 2018. The associated assets and liabilities are included in branch assets and liabilities held for sale as of December 31, 2017. The completion of this sale resulted in the Company exiting the Austin metropolitan market.

Additionally, in the fourth quarter of 2017, the Company ceased using one of its Dallas, Texas branch buildings. The Company currently expects to complete a sale of the building in the second or third quarter of 2018. The associated building and improvements are included in branch assets held for sale as of March 31, 2018 and December 31, 2017.

The following table presents the assets and liabilities held for sale as of March 31, 2018 and December 31, 2017:



	March 31, 2018		December 31, 2017
Assets
Cash and cash equivalents	$	—	$	334
Loans	—		26,313
Accrued interest receivable	—		63
Bank premises, furniture and equipment	1,753		5,118
Intangible assets	—		1,724
Total assets	$	1,753	$	33,552
Liabilities
Deposits	$	—	$	64,282
Accounts payable and accrued expenses	—		2
Deferred tax liability	—		327
Accrued interest payable and other liabilities	—		16
Total liabilities	$	—	$	64,627

Summary of Significant Accounting Policies (Policies)	3 Months Ended
Summary of Significant Accounting Policies (Policies)	Mar. 31, 2018
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited condensed consolidated financial statements include the accounts of Veritex and the Bank as its wholly-owned subsidiary. The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States of America (“GAAP”), but do not include all of the information and footnotes required for complete financial statements. In management’s opinion, these interim unaudited condensed consolidated financial statements include all adjustments of a normal recurring nature necessary for a fair statement of the Company’s condensed consolidated financial position at March 31, 2018 and December 31, 2017, condensed consolidated results of operations for the three months ended March 31, 2018 and 2017, condensed consolidated stockholders’ equity for the three months ended March 31, 2018 and 2017 and condensed consolidated cash flows for the three months ended March 31, 2018 and 2017. Accounting measurements at interim dates inherently involve greater reliance on estimates than at year end and the results for the interim periods shown herein are not necessarily indicative of results to be expected for the full year due in part to global economic and financial market conditions, interest rates, access to sources of liquidity, market competition and interruptions of business processes. These interim unaudited condensed consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements and notes thereto for the year ended December 31, 2017 included within the Company’s Form 10-K as filed with the Securities and Exchange Commission on March 14, 2018. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the condensed consolidated financial statements and accompanying notes. These estimates and assumptions may also affect disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from these estimates.
Segment Reporting	Segment Reporting The Company has one reportable segment. All of the Company’s activities are interrelated, and each activity is dependent and assessed based on how each of the activities of the Company supports the others. For example, lending is dependent upon the ability of the Company to fund itself with deposits and borrowings while managing the interest rate and credit risk. Accordingly, all significant operating decisions are based upon analysis of the Bank as one segment or unit. The Company’s chief operating decision-maker, the Chief Executive Officer, uses the consolidated results to make operating and strategic decisions.
Reclassifications	Reclassifications Some items in the prior year financial statements were reclassified to conform to the current presentation.
Revenue From Contracts With Customers	Revenue from Contracts with Customers The Company records revenue from contracts with customers in accordance with Accounting Standards Codification Topic 606, “Revenue from Contracts with Customers” (“Topic 606”). Under Topic 606, the Company must identify the contract with a customer, identify the performance obligations in the contract, determine the transaction price, allocate the transaction price to the performance obligations in the contract, and recognize revenue when (or as) the Company satisfies a performance obligation. Significant revenue has not been recognized in the current reporting period that results from performance obligations satisfied in previous periods. The Company’s primary sources of revenue are derived from interest income on financial assets that are not within the scope of Topic 606. The Company has evaluated the nature of its contracts with customers and determined that further disaggregation of revenue from contracts with customers into more granular categories beyond what is presented in the Condensed Consolidated Statements of Income was not necessary. The Company generally fully satisfies its performance obligations on its contracts with customers as services are rendered and the transaction prices are typically fixed; charged either on a periodic basis or based on activity. Because performance obligations are satisfied as services are rendered and the transaction prices are fixed, there is little judgment involved in applying Topic 606 that significantly affects the determination of the amount and timing of revenue from contracts with customers.
Earnings Per Share	Earnings Per Share Earnings per share (“EPS”) are based upon the weighted-average shares outstanding.
Adoption of New Accounting Standards and Recent Accounting Pronouncements	Revenue from Contracts with Customers The Company records revenue from contracts with customers in accordance with Accounting Standards Codification Topic 606, “Revenue from Contracts with Customers” (“Topic 606”). Under Topic 606, the Company must identify the contract with a customer, identify the performance obligations in the contract, determine the transaction price, allocate the transaction price to the performance obligations in the contract, and recognize revenue when (or as) the Company satisfies a performance obligation. Significant revenue has not been recognized in the current reporting period that results from performance obligations satisfied in previous periods. The Company’s primary sources of revenue are derived from interest income on financial assets that are not within the scope of Topic 606. The Company has evaluated the nature of its contracts with customers and determined that further disaggregation of revenue from contracts with customers into more granular categories beyond what is presented in the Condensed Consolidated Statements of Income was not necessary. The Company generally fully satisfies its performance obligations on its contracts with customers as services are rendered and the transaction prices are typically fixed; charged either on a periodic basis or based on activity. Because performance obligations are satisfied as services are rendered and the transaction prices are fixed, there is little judgment involved in applying Topic 606 that significantly affects the determination of the amount and timing of revenue from contracts with customers. Adoption of New Accounting Standards In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2014-09, “Revenue from Contracts with Customers” (“ASU 2014-09”), which requires an entity to recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The ASU replaces most existing revenue recognition guidance in GAAP. The new standard was effective for the Company on January 1, 2018. Adoption of ASU 2014-09 did not have a material impact on the Company’s condensed consolidated financial statements and related disclosures as the Company’s primary sources of revenues are derived from interest income on financial assets that are not within the scope of ASU 2014-09. The Company’s revenue recognition pattern for revenue streams within the scope of ASU 2014-09, including but not limited to service charges on deposit accounts, did not change significantly from current practice. The standard permits the use of either the full retrospective or modified retrospective transition method. The Company elected to use the modified retrospective transition method which requires application of ASU 2014-09 to uncompleted contracts at the date of adoption. However, periods prior to the date of adoption will not be retrospectively revised as the impact of the ASU on uncompleted contracts at the date of adoption was not material. In January 2016, the FASB issued ASU No. 2016-01, “Financial Instruments – Overall: Recognition and Measurement of Financial Assets and Financial Liabilities” (“ASU 2016-01”) which amends certain aspects of recognition, measurement, presentation, and disclosure of financial instruments. ASU 2016-01, among other things, (i) requires equity investments, with certain exceptions, to be measured at fair value with changes in fair value recognized in net income, (ii) simplifies the impairment assessment of equity investments without readily determinable fair values by requiring a qualitative assessment to identify impairment, (iii) eliminates the requirement for public business entities to disclose the methods and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet, (iv) requires public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes, (v) requires an entity to present separately in other comprehensive income the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option for financial instruments, (vi) requires separate presentation of financial assets and financial liabilities by measurement category and form of financial asset on the balance sheet or the accompanying notes to the financial statements and (vii) clarifies that an entity should evaluate the need for a valuation allowance on a deferred tax asset related to available-for-sale. The adoption of ASU 2016-01 on January 1, 2018 did not have a material impact on the Company’s condensed consolidated financial statements. In accordance with (iv) above, the Company measured the fair value of its loan portfolio prospectively as of March 31, 2018 using an exit price notion. See Note 7 – Fair Value Disclosures for further information regarding the valuation of these loans. Recent Accounting Pronouncements ASU 2017-04 “Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment” (“ASU 2017-04”) eliminates Step 2 from the goodwill impairment test. In addition, the amendment eliminates the requirements for any reporting unit with a zero or negative carrying amount to perform a qualitative assessment and, if it fails that qualitative test, to perform Step 2 of the goodwill impairment test. For public companies, ASU 2017-04 is effective for fiscal years beginning after December 15, 2019 with early adoption permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017. The Company is in process of evaluating the impact of this pronouncement, which is not expected to have a significant impact on the consolidated financial statements. ASU 2016-13 “Financial Instruments —Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments” (“ASU 2016-13”) amends guidance on reporting credit losses for assets held at amortized cost basis and available for sale debt securities. For assets held at amortized cost basis, Topic 326 eliminates the probable initial recognition threshold in current GAAP and, instead, requires an entity to reflect its current estimate of all expected credit losses. The allowance for credit losses is a valuation account that is deducted from the amortized cost basis of the financial assets to present the net amount expected to be collected. For available for sale debt securities, credit losses should be measured in a manner similar to current GAAP, however Topic 326 will require that credit losses be presented as an allowance rather than as a write-down. ASU 2016-13 affects entities holding financial assets and net investment in leases that are not accounted for at fair value through net income. The amendments affect loans, debt securities, trade receivables, net investments in leases, off balance sheet credit exposures, reinsurance receivables, and any other financial assets not excluded from the scope that have the contractual right to receive cash. For public business entities, ASU 2016-13 is effective for financial statements issued for fiscal years beginning after December 15, 2019, and interim periods therein. The Company is continuing to evaluate the impact of the adoption of ASU 2016-13 and is uncertain of the impact on the consolidated financial statements at this point in time. ASU 2016-02 “Leases (Topic 842)” (“ASU 2016-02”) is intended to improve the reporting of leasing transactions to provide users of financial statements with more decision-useful information. ASU 2016-02 will require organizations that lease assets to recognize on the balance sheet the assets and liabilities for the rights and obligations created by those leases. ASU 2016-02 is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Early adoption is permitted. Adoption of ASU 2016-02 is not expected to have a material impact on the Company’s consolidated financial statements. The Company leases certain properties and equipment under operating leases that will result in the recognition of lease assets and lease liabilities on the Company’s balance sheet under ASU 2016-02, however, the majority of the Company’s properties and equipment are owned, not leased. We expect recorded assets and liabilities to increase upon adoption of the standard as it relates to operating leases in which we are the lessee.

Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2018

Accounting Policies [Abstract]

Schedule of Reconciliation Between Weighted Average Shares Used for Calculating Basic and Diluted EPS

The table below sets forth the reconciliation between weighted average shares used for calculating basic and diluted EPS for the three months ended March 31, 2018 and 2017:



	Three Months Ended March 31,
	2018		2017
Earnings (numerator)
Net income	$	10,388	$	3,098
Shares (denominator) in thousands
Weighted average shares outstanding for basic EPS	24,120		15,200
Dilutive effect of employee stock-based awards	419		432
Adjusted weighted average shares outstanding	24,539		15,632
Earnings per share:
Basic	$	0.43	$	0.20
Diluted	$	0.42	$	0.20

Supplemental Statement of Cash Flows (Tables)

3 Months Ended

Mar. 31, 2018

Supplemental Cash Flow Elements [Abstract]

Schedule of Other Supplemental Cash Flow Information

Other supplemental cash flow information is presented below:



	Three Months Ended March 31,
	2018			2017
Supplemental Disclosures of Cash Flow Information:
Cash paid for interest	$	4,928		$	1,834
Supplemental Disclosures of Non-Cash Flow Information:
Net foreclosure of other real estate owned and repossessed assets	$	8		$	336
Non-cash assets acquired⁽¹⁾
Loans	$	(4,622	)	$	—
Bank premises, furniture and equipment	1,162			—
Intangible assets	(956		)	—
Goodwill	2,233			—
Other assets	1,934			—
Non-cash liabilities assumed⁽¹⁾
Deposits	$	(303	)	$	—
Accrued interest payable and other liabilities	54			—

(1) Represents adjustments to provision estimates recorded for acquisitions of Sovereign Bancshares, Inc. and Liberty Bancshares, Inc.. Refer to Note 12. Business Combinations for further discussion.

Investment Securities (Tables)

3 Months Ended

Mar. 31, 2018

Investments, Debt and Equity Securities [Abstract]

Schedule of Carrying Amount and Approximate Fair Values of Available-for-Sale Securities

The amortized cost, related gross unrealized gains and losses recognized in accumulated other comprehensive income (loss), and the fair value of securities are as follows:



	March 31, 2018
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Available for Sale
U.S. government agencies	$	10,362	$	—	$	181	$	10,181
Corporate bonds	20,852		98		10		20,940
Municipal securities	44,878		44		445		44,477
Mortgage-backed securities	94,406		37		2,448		91,995
Collateralized mortgage obligations	76,651		6		1,678		74,979
Asset-backed securities	586		6		—		592
	$	247,735	$	191	$	4,762	$	243,164



	December 31, 2017
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Available for Sale
U.S. government agencies	$	10,829	$	9	$	18	$	10,820
Corporate bonds	17,500		330		—		17,830
Municipal securities	55,499		189		211		55,477
Mortgage-backed securities	91,734		58		1,068		90,724
Collateralized mortgage obligations	53,559		9		925		52,643
Asset-backed securities	616		7		—		623
	$	229,737	$	602	$	2,222	$	228,117

Schedule of Investment Securities That Have Been in a Continuous Unrealized Loss Position



	March 31, 2018
	Less Than 12 Months				12 Months or More				Totals
	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
Available for Sale
U.S. government agencies	$	9,606	$	161	$	576	$	20	$	10,182	$	181
Corporate bonds	3,990		10		—		—		3,990		10
Municipal securities	27,412		257		5,406		188		32,818		445
Mortgage-backed securities	61,666		1,592		23,140		856		84,806		2,448
Collateralized mortgage obligations	28,317		756		23,024		922		51,341		1,678
	$	130,991	$	2,776	$	52,146	$	1,986	$	183,137	$	4,762



	December 31, 2017
	Less Than 12 Months				12 Months or More				Totals
	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
	Value		Loss		Value		Loss		Value		Loss
Available for Sale
U.S. government agencies	$	3,470	$	4	$	629	$	14	$	4,099	$	18
Municipal securities	14,593		79		7,092		132		21,685		211
Mortgage-backed securities	52,075		513		29,485		555		81,560		1,068
Collateralized mortgage obligations	31,581		395		20,305		530		51,886		925
	$	101,719	$	991	$	57,511	$	1,231	$	159,230	$	2,222

Schedule of Amortized Costs and Estimated Fair Values of Securities Available for Sale, By Contractual Maturity



	March 31, 2018
	Available For Sale
	Amortized Cost		Fair Value
Due in one year or less	$	2,265	$	2,271
Due from one year to five years	23,624		23,548
Due from five years to ten years	27,624		27,449
Due after ten years	22,579		22,330
	76,092		75,598
Mortgage-backed securities	94,406		91,995
Collateralized mortgage obligations	76,651		74,979
Asset-backed securities	586		592
	$	247,735	$	243,164



	December 31, 2017
	Available For Sale
	Amortized Cost		Fair Value
Due in one year or less	$	2,328	$	2,330
Due from one year to five years	29,654		29,991
Due from five years to ten years	34,480		34,474
Due after ten years	17,366		17,332
	83,828		84,127
Mortgage-backed securities	91,734		90,724
Collateralized mortgage obligations	53,559		52,643
Asset-backed securities	616		623
	$	229,737	$	228,117

Schedule of Proceeds From Sales of Investment Securities Available for Sale and Gross Gains and Losses

Proceeds from sales of investment securities available for sale and gross gains and losses for the three months ended March 31, 2018 and 2017 were as follows:



	Three Months Ended March 31,
	2018		2017
Proceeds from sales	$	30,149	$	—
Gross realized gains	323		—
Gross realized losses	315		—

Loans and Allowance for Loan Losses (Tables)

3 Months Ended

Mar. 31, 2018

Receivables [Abstract]

Summary of Loans in the Accompanying Consolidated Balance Sheets

Loans in the accompanying condensed consolidated balance sheets are summarized as follows:



	March 31, 2018			December 31, 2017
Real estate:
Construction and land	$	301,023		$	277,825
Farmland	9,366			9,385
1 - 4 family residential	246,806			236,542
Multi-family residential	122,482			106,275
Commercial Real Estate	955,541			909,292
Commercial	672,820			684,551
Consumer	8,051			9,648
	2,316,089			2,233,518
Deferred loan fees	(24		)	(28		)
Allowance for loan losses	(13,401		)	(12,808		)
	$	2,302,664		$	2,220,682

The outstanding balance represents the total amount owed, including accrued but unpaid interest, and any amounts previously charged off.



	March 31, 2018		December 31, 2017
Carrying amount	$	41,950	$	47,612
Outstanding balance	54,690		63,940



	Three Months Ended March 31, 2018
Balance at beginning of period	$	2,723
Purchase accounting adjustments	1,414
Reclassifications from nonaccretable	5,870
Accretion	(1,868		)
Balance at end of period	$	8,139

Schedule of Non-Accrual Loans

Non-accrual loans aggregated by class of loans, as of March 31, 2018 and December 31, 2017, are as follows:



	Non-Accrual Loans⁽¹⁾
	March 31, 2018		December 31, 2017
Real estate:
Construction and land	$	2,769	$	—
Farmland	—		—
1 - 4 family residential	—		—
Multi-family residential	—		—
Commercial Real Estate	59		61
Commercial	605		398
Consumer	5		6
	$	3,438	$	465

⁽¹⁾Excludes PCI loans. PCI loans are generally reported as accrual loans unless significant concerns exist related to the predictability of the timing and amount of future cash flows.

Schedule of Age Analysis of Past Due Loans, Aggregated by Class of Loans

An age analysis of past due loans, aggregated by class of loans, as of March 31, 2018 and December 31, 2017 is as follows:



	March 31, 2018
	30 to 59 Days		60 to 89 Days		90 Days or Greater		Total Past Due		Total Current ⁽¹⁾		Total Loans		Total 90 Days Past Due and Still Accruing⁽²⁾
Real estate:
Construction and land	$	—	$	—	$	2,769	$	2,769	$	298,254	$	301,023	$	—
Farmland	—		—		—		—		9,366		9,366		—
1 - 4 family residential	23		37		—		60		246,746		246,806		—
Multi-family residential	—		—		—		—		122,482		122,482		—
Commercial Real Estate	874		—		—		874		954,667		955,541		—
Commercial	982		49		451		1,482		671,338		672,820		374
Consumer	47		48		—		95		7,956		8,051		—
	$	1,926	$	134	$	3,220	$	5,280	$	2,310,809	$	2,316,089	$	374

⁽¹⁾ Includes all PCI loans.

⁽²⁾ Loans 90 days past due and still accruing excludes $2,000 of PCI loans as of March 31, 2018. No PCI loans were considered non-performing loans as of March 31, 2018.



	December 31, 2017
	30 to 59 Days		60 to 89 Days		90 Days or Greater		Total Past Due		Total Current⁽¹⁾⁽³⁾		Total Loans		Total 90 Days Past Due and Still Accruing
Real estate:
Construction and land	$	320	$	—	$	—	$	320	$	277,505	$	277,825	$	—
Farmland	104		—		—		104		9,281		9,385		—
1 - 4 family residential	1,274		139		—		1,413		235,129		236,542		—
Multi-family residential	—		—		—		—		106,275		106,275		—
Commercial Real Estate	1,830		—		—		1,830		907,462		909,292		—
Commercial	1,849		389		389		2,627		681,924		684,551		—
Consumer	39		51		18		108		9,540		9,648		18
	$	5,416	$	579	$	407	$	6,402	$	2,227,116	$	2,233,518	$	18

⁽¹⁾ Includes all PCI loans.

⁽²⁾ Loans 90 days past due and still accruing excludes $3,300 of PCI loans as of December 31, 2017. No PCI loans were considered non-performing loans as of December 31, 2017.

⁽³⁾ To conform to the current period presentation, $15,123 was reclassified from 1-4 family residential to multi-family residential within the total current column.

Summary of Impaired Loans, Including Purchased Credit Impaired Loans and TDRs



	March 31, 2018 ⁽¹⁾
	Unpaid Contractual Principal Balance		Recorded Investment with No Allowance		Recorded Investment With Allowance		Total Recorded Investment		Related Allowance		Average Recorded Investment YTD
Real estate:
Construction and land	$	2,769	$	2,769	$	—	$	2,769	$	—	$	2,769
Farmland	—		—		—		—		—		—
1 - 4 family residential	161		161		—		161		—		161
Multi-family residential	—		—		—		—		—		—
Commercial Real Estate	429		429		—		429		—		434
Commercial	605		346		259		605		66		638
Consumer	74		74		—		74		—		78
Total	$	4,038	$	3,779	$	259	$	4,038	$	66	$	4,080

⁽¹⁾Excludes PCI loans that have not experienced further deterioration in credit quality subsequent to the acquisition date.



	December 31, 2017⁽¹⁾
	Unpaid Contractual Principal Balance		Recorded Investment with No Allowance		Recorded Investment With Allowance		Total Recorded Investment		Related Allowance		Average Recorded Investment YTD
Real estate:
Construction and land	$	—	$	—	$	—	$	—	$	—	$	—
Farmland	—		—		—		—		—		—
1 - 4 family residential	161		161		—		161		—		163
Multi-family residential	—		—		—		—		—		—
Commercial Real Estate	434		434		—		434		—		445
Commercial	398		282		116		398		12		499
Consumer	75		75		—		75		—		87
Total	$	1,068	$	952	$	116	$	1,068	$	12	$	1,194

⁽¹⁾Excludes PCI loans that have not experienced further deterioration in credit quality subsequent to the acquisition date.

Summary of Internal Ratings of Loans, Including Purchased Credit Impaired Loans

The following tables summarize the Company’s internal ratings of its loans, including PCI loans, as of March 31, 2018 and December 31, 2017:



	March 31, 2018
	Pass		Special Mention		Substandard		Doubtful		PCI		Total
Real estate:
Construction and land	$	297,572	$	682	$	2,769	$	—	$	—	$	301,023
Farmland	9,328		—		—		—		38		9,366
1 - 4 family residential	246,103		410		197		—		96		246,806
Multi-family residential	122,482		—		—		—		—		122,482
Commercial Real Estate	929,170		8,608		762		—		17,001		955,541
Commercial	629,792		17,039		1,174		—		24,815		672,820
Consumer	7,952		—		99		—		—		8,051
Total	$	2,242,399	$	26,739	$	5,001	$	—	$	41,950	$	2,316,089



	December 31, 2017⁽¹⁾
	Pass		Special Mention		Substandard		Doubtful		PCI		Total
Real estate:
Construction and land	$	277,186	$	639	$	—	$	—	$	—	$	277,825
Farmland	9,336		—		—		—		49		9,385
1 - 4 family residential	235,781		462		200		—		99		236,542
Multi-family residential	106,275		—		—		—		—		106,275
Commercial Real Estate	882,523		8,771		681		—		17,317		909,292
Commercial	634,796		18,337		1,155		116		30,147		684,551
Consumer	9,540		—		108		—		—		9,648
Total	$	2,155,437	$	28,209	$	2,144	$	116	$	47,612	$	2,233,518

Schedule of Analysis of the Allowance for Loan Losses

An analysis of the allowance for loan losses for the three months ended March 31, 2018 and 2017 and year ended December 31, 2017 is as follows:



	Three Months Ended March 31, 2018			Year Ended December 31, 2017			Three Months Ended March 31, 2017
Balance at beginning of period	$	12,808		$	8,524		$	8,524
Provision charged to earnings	678			5,114			890
Charge-offs	(94		)	(839		)	(603		)
Recoveries	9			9			5
Net charge-offs	(85		)	(830		)	(598		)
Balance at end of period	$	13,401		$	12,808		$	8,816

Summary of Activity in the Allowance for Loan Losses by Class of Loans

The following tables summarize the activity in the allowance for loan losses by portfolio segment for the periods indicated:



	For the Three Months Ended March 31, 2018
	Real Estate
	Construction, Land and Farmland		Residential		Commercial Real Estate		Commercial			Consumer		Total
Balance at beginning of period	$	1,315	$	1,473	$	4,410	$	5,588		$	22	$	12,808
Provision (recapture) charged to earnings	111		117		552		(102		)	—		678
Charge-offs	—		—		—		(94		)	—		(94		)
Recoveries	—		—		—		9			—		9
Net charge-offs (recoveries)	—		—		—		(85		)	—		(85		)
Balance at end of period	$	1,426	$	1,590	$	4,962	$	5,401		$	22	$	13,401
Period-end amount allocated to:
Specific reserves:	—		—		—		66			—		66
General reserves	1,426		1,590		4,962		5,335			22		13,335
Total	$	1,426	$	1,590	$	4,962	$	5,401		$	22	$	13,401



	For the Year Ended December 31, 2017
	Real Estate
	Construction, Land and Farmland			Residential			Commercial Real Estate		Commercial			Consumer			Total
Balance at beginning of period	$	1,415		$	1,116		$	3,003	$	2,955		$	35		$	8,524
Provision (recapture) charged to earnings	(100		)	368			1,407		3,452			(13		)	5,114
Charge-offs	—			(11		)	—		(828		)	—			(839		)
Recoveries	—			—			—		9			—			9
Net charge-offs (recoveries)	—			(11		)	—		(819		)	—			(830		)
Balance at end of period	$	1,315		$	1,473		$	4,410	$	5,588		$	22		$	12,808
Period-end amount allocated to:
Specific reserves:	—			—			—		12			—			12
General reserves	1,315			1,473			4,410		5,576			22			12,796
Total	$	1,315		$	1,473		$	4,410	$	5,588		$	22		$	12,808



	For the Three Months Ended March 31, 2017
	Real Estate
	Construction, Land and Farmland			Residential		Commercial Real Estate		Commercial			Consumer			Total
Balance at beginning of year	$	1,415		$	1,116	$	3,003	$	2,955		$	35		$	8,524
Provision (recapture) charged to earnings	(114		)	38		28		939			(1		)	890
Charge-offs	—			—		—		(603		)	—			(603		)
Recoveries	—			—		—		5			—			5
Net charge-offs (recoveries)	—			—		—		(598		)	—			(598		)
Balance at end of period	$	1,301		$	1,154	$	3,031	$	3,296		$	34		$	8,816
Period-end amount allocated to:
Specific reserves:	—			—		—		133			3			136
General reserves	1,301			1,154		3,031		3,163			31			8,680
Total	$	1,301		$	1,154	$	3,031	$	3,296		$	34		$	8,816

Schedule of Recorded Investment in Loans Related to the Balance in the Allowance for Loan Losses on the Basis of the Company's Impairment Methodology



	March 31, 2018
	Real Estate
	Construction, Land and Farmland		Residential		Commercial Real Estate		Commercial		Consumer		Total
Loans individually evaluated for impairment	$	2,769	$	161	$	429	$	605	$	74	$	4,038
Loans collectively evaluated for impairment	307,582		369,031		938,111		647,400		7,977		2,270,101
PCI loans	38		96		17,001		24,815		—		41,950
Total	$	310,389	$	369,288	$	955,541	$	672,820	$	8,051	$	2,316,089



	December 31, 2017
	Real Estate
	Construction, Land and Farmland		Residential		Commercial Real Estate		Commercial		Consumer		Total
Loans individually evaluated for impairment	$	—	$	161	$	434	$	398	$	75	$	1,068
Loans collectively evaluated for impairment	287,161		342,557		891,541		654,006		9,573		2,184,838
PCI loans	49		99		17,317		30,147		—		47,612
Total	$	287,210	$	342,817	$	909,292	$	684,551	$	9,648	$	2,233,518

Schedule of Summary of Changes in Servicing Assets

The Company was servicing loans of approximately $74,946 and $38,671 as of March 31, 2018 and 2017, respectively. A summary of the changes in the related servicing assets are as follows:



	Three Months Ended March 31,
	2018			2017
Balance at beginning of period	$	1,215		$	601
Increase from loan sales	92			137
Amortization charged to income	(102		)	(56		)
Balance at end of period	$	1,205		$	682

Commitments and Contingencies Commitments and Contingencies (Tables)

3 Months Ended

Mar. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Rollforward of Cease-use Liability

The below table is a roll-forward of the cease-use liability from December 31, 2017 to March 31, 2018.



	Cease-Use Liability
Balance as of December 31, 2017	$	1,407
Payments	(35		)
Reversal upon lease assignment	(669		)
Balance as of March 31, 2018	$	703

- Definition

Tabular disclosure of the loss contingencies that were reported in the period or disclosed as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14472-108349

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82913245&loc=d3e12021-110248

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14453-108349

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=82913245&loc=d3e12053-110248

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14394-108349

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14435-108349

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14557-108349

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14615-108349

+ Details

Fair Value Disclosures (Tables)

3 Months Ended

Mar. 31, 2018

Fair Value Disclosures [Abstract]

Schedule of Assets Measured at Fair Value on a Recurring Basis



	Fair Value Measurements Using
	Level 1 Inputs		Level 2 Inputs		Level 3 Inputs		Total Fair Value
As of March 31, 2018
Investment securities available for sale	$	—	$	243,164	$	—	$	243,164
As of December 31, 2017
Investment securities available for sale	$	—	$	228,117	$	—	$	228,117

Schedule of Assets Measured at Fair Value on a Non-Recurring Basis



	Fair Value Measurements Using
	Level 1 Inputs		Level 2 Inputs		Level 3 Inputs		Total Fair Value
As of March 31, 2018
Assets:
Impaired loans	$	—	$	—	$	259	$	259
Other real estate owned	$	—	$	—	$	10	$	10
As of December 31, 2017
Assets:
Impaired loans	$	—	$	—	$	116	$	116
Other real estate owned	$	—	$	—	$	449	$	449

Schedule of Significant Unobservable Inputs Used in the Fair Value Measurements

For Level 3 financial assets measured at fair value as of March 31, 2018 and December 31, 2017, the significant unobservable inputs used in the fair value measurements were as follows:



March 31, 2018
			Valuation	Unobservable	Weighted
Assets/Liabilities	Fair Value		Technique	Input(s)	Average
Impaired loans	$	259	Collateral Method	Adjustments for selling costs	8	%
Other real estate owned	$	10	Collateral Method	Adjustments for selling costs	8	%



December 31, 2017
			Valuation	Unobservable	Weighted
Assets/Liabilities	Fair Value		Technique	Input(s)	Average
Impaired loans	$	116	Collateral Method	Adjustments for selling costs	8	%
Other real estate owned	$	449	Collateral Method	Adjustments for selling costs	8	%

Schedule of Estimated Fair Values and Carrying Values of All Financial Instruments

The estimated fair values and carrying values of all financial instruments under current authoritative guidance as of March 31, 2018 and December 31, 2017 were as follows:



			Fair Value
	Carrying Amount		Level 1		Level 2		Level 3
March 31, 2018
Financial assets:
Cash and cash equivalents	$	195,194	$	—	$	195,194	$	—
Loans held for sale	893		—		893		—
Loans, net	2,302,664		—		—		2,316,438
Accrued interest receivable	7,127		—		7,127		—
Bank-owned life insurance	21,620		—		21,620		—
Servicing asset	1,205		—		1,205		—
Non-marketable equity securities	20,806		—		20,806		—
Financial instruments, assets held for sale	1,753		—		1,753		—
Financial liabilities:
Deposits	$	2,493,794	$	—	$	2,425,559	$	—
Advances from FHLB	48,128		—		48,173		—
Accrued interest payable	471		—		471		—
Junior subordinated debentures	11,702		—		11,702		—
Subordinated notes	4,988		—		4,988		—
December 31, 2017
Financial assets:
Cash and cash equivalents	$	149,044	$	—	$	149,044	$	—
Loans held for sale	841		—		841		—
Loans, net	2,220,682		—				2,234,094
Accrued interest receivable	7,676		—		7,676		—
Bank-owned life insurance	21,476		—		21,476		—
Servicing asset	1,243		—		1,243		—
Non-marketable equity securities	13,732		—		13,732		—
Financial instruments, assets held for sale	31,828				5,515		26,313
Financial liabilities:
Deposits	$	2,278,630	$	—	$	2,164,498	$	—
Advances from FHLB	71,164		—		70,110		—
Accrued interest payable	445		—		445		—
Junior subordinated debentures	11,702		—		11,702		—
Subordinated notes	4,987		—		4,987		—
Other borrowings	15,000		—		15,000		—
Financial instruments, liabilities held for sale	64,300		—		64,300		—

Financial Instruments with Off-Balance Sheet Risk (Tables)

3 Months Ended

Mar. 31, 2018

Fair Value Disclosures [Abstract]

Schedule of the Approximate Amounts of Financial Instruments with Off-Balance Sheet Risk

The following table sets forth the approximate amounts of these financial instruments as of March 31, 2018 and December 31, 2017:



	March 31,		December 31,
	2018		2017
Commitments to extend credit	$	625,590	$	606,451
Standby and commercial letters of credit	10,147		9,299
	$	635,737	$	615,750

Stock and Incentive Plans (Tables)

3 Months Ended

Mar. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary of Option Activity

A summary of option activity under the 2010 Incentive Plan for the three months ended March 31, 2018 and 2017, and changes during the period then ended is presented below:



	2010 Incentive Plan
	Non-Performance Based Stock Options
	Shares Underlying Options		Weighted Exercise Price		Weighted Average Contractual Term	Aggregate Intrinsic Value
Outstanding at January 1, 2017	325,500		$	10.15	4.56 years
Exercised	(15,000	)	10.00
Outstanding at March 31, 2017	310,500		$	10.16	4.34 years

Outstanding at January 1, 2018	305,000		$	10.16	3.59 years
Exercised	(9,000	)	10.38			156
Outstanding at March 31, 2018	296,000		$	10.16	3.31 years	$	5,183
Options exercisable at March 31, 2018	290,000		$	10.12	3.25 years	$	5,091

A summary of the status of the Company’s stock options under the 2014 Omnibus Plan as of March 31, 2018 and 2017, and changes during the three months ended is as follows:



	2014 Omnibus Plan
	Non-performance Based Stock Options
	Shares Underlying Options		Weighted Exercise Price		Weighted Average Contractual Term	Aggregate Intrinsic Value
Outstanding at January 1, 2017	128,366		$	15.32	8.69 years
Granted	55,440		26.92
Outstanding at March 31, 2017	183,806		$	18.82	8.85 years

Outstanding at January 1, 2018	332,706		$	22.71	8.86 years	$	1,614
Granted	112,593		27.63
Exercised	(1,983	)	14.95			25
Outstanding at March 31, 2018	443,316		$	23.95	8.89 years	$	1,629
Options exercisable at March 31, 2018	104,396		$	17.21	7.56 years	$	1,092
Weighted average fair value of options granted during the period			$	9.38

Summary of Status of the Company's Restricted Shares or Restricted Stock Units



	2014 Omnibus Plan
	Non-performance Based
	Restricted Stock Units
	Units		Weighted Average Grant Date Fair Value
Outstanding at January 1, 2017	67,956		$	13.79
Granted	22,500		27.84
Vested into shares	(5,350	)	4.38
Outstanding at March 31, 2017	85,106		$	18.09

Outstanding at January 1, 2018	150,722		$	13.29
Granted	34,500		28.05
Vested into shares	(8,399	)	25.13
Outstanding at March 31, 2018	176,823		$	15.61

A summary of the status of the Company’s performance based restricted stock units under the 2014 Omnibus Plan as of March 31, 2018 and 2017, and changes during the three months ended is as follows:



	2014 Omnibus Plan
	Performance Based
	Restricted Stock Units
	Units		Weighted Average Grant Date Fair Value
Outstanding at January 1, 2017	51,197		$	8.72
Granted	25,522		24.34
Vested into shares	(19,861	)	15.34
Outstanding at March 31, 2017	56,858		$	13.42

Outstanding at January 1, 2018	53,594		$	8.72
Granted	40,269		27.59
Vested into shares	(26,623	)	18.83
Outstanding at March 31, 2018	67,240		$	16.01

A summary of the status of the Company’s restricted stock units under the 2010 Incentive Plan as of March 31, 2018 and 2017, and changes during the three months then ended is as follows:



	2010 Incentive Plan
	Units		Weighted Average Grant Date Fair Value
Outstanding at January 1, 2017	27,750		$	11.92
Vested	(1,000	)	10.85
Outstanding at March 31, 2017	26,750		$	11.96

Outstanding at January 1, 2018	24,250		$	13.19
Vested into shares	(8,750	)	10.85
Forfeited	(500	)	10.85
Outstanding at March 31, 2018	15,000		$	14.99

Schedule of Assumptions Used to Measure Fair Value of Each Option Award Estimated On Grant Date Using Black-Scholes Option-Pricing Model



	For the Three Months Ended March 31,
	2018	2017
Dividend yield	0.00%	0.00%
Expected life	5.0 to 7.5 years	5.0 to 7.5 years
Expected volatility	27.87% to 37.55%	32.82% to 37.55%
Risk-free interest rate	1.06% to 2.73%	1.06% to 2.32%

Schedule of Share-based Compensation, Employee Stock Purchase Plan, Activity

A summary of the fair value of the Company’s stock options exercised and restricted stock units vested under the 2010 Incentive Plan as of March 31, 2018 and 2017 is presented below:

A summary of the fair value of the Company’s stock options exercised and restricted stock units vested under the 2014 Omnibus Plan as of March 31, 2018 and 2017 is presented below:



	Fair Value of Options Exercised or Restricted Stock Units Vested as of March 31,
	2018	2017
Non-performance based stock options exercised	54	—
Non-performance based restricted stock units vested	745	530
Performance based restricted stock units vested	234	150

Capital Requirements and Restrictions on Retained Earnings (Tables)

3 Months Ended

Mar. 31, 2018

Banking and Thrift [Abstract]

Schedule of Comparison of the Company's and Bank's Actual Capital Amounts and Ratios to Required Capital Amounts and Ratios

A comparison of the Company’s and Bank’s actual capital amounts and ratios to required capital amounts and ratios is presented in the following table:



	Actual				For Capital Adequacy Purposes				To Be Well Capitalized Under Prompt Corrective Action Provisions
	Amount		Ratio		Amount		Ratio		Amount		Ratio
As of March 31, 2018
Total capital (to risk-weighted assets)
Company	$	351,078	13.17	%	$	213,259	8.0	%	n/a		n/a
Bank	305,561		11.45	%	213,492		8.0	%	$	266,866	10.0	%
Tier 1 capital (to risk-weighted assets)
Company	332,690		12.48	%	159,947		6.0	%	n/a		n/a
Bank	292,160		10.94	%	160,234		6.0	%	213,645		8.0
Common equity tier 1 to risk-weighted assets
Company	320,987		12.04	%	119,970		4.5	%	n/a		n/a
Bank	292,160		10.94	%	120,176		4.5	%	173,587		6.5
Tier 1 capital (to average assets)
Company	332,690		11.84	%	112,395		4.0	%	n/a		n/a
Bank	292,160		10.39	%	112,477		4.0	%	140,597		5.0
As of December 31, 2017
Total capital (to risk-weighted assets)
Company	$	342,521	13.16	%	$	208,219	8.0	%	n/a		n/a
Bank	296,207		11.37	%	208,413		8.0	%	$	260,516	10.0	%
Tier 1 capital (to risk-weighted assets)
Company	324,726		12.48	%	156,118		6.0	%	n/a		n/a
Bank	283,399		10.88	%	156,286		6.0	%	208,382		8.0
Common equity tier 1 to risk-weighted assets
Company	313,024		12.03	%	11,791		4.5	%	n/a		n/a
Bank	283,399		10.88	%	117,215		4.5	%	169,310		6.5
Tier 1 capital (to average assets)
Company	324,726		12.92	%	100,534		4.0	%	n/a		n/a
Bank	283,399		11.28	%	100,496		4.0	%	125,620		5.0

Business Combinations (Tables)

3 Months Ended

Mar. 31, 2018

Business Combinations [Abstract]

Schedule of Acquired Assets and Assumed Liabilities



	Initial Estimate		Adjustments			Revised Final Fair Value
Assets
Cash and cash equivalents	$	44,775	$	—		$	44,775
Investment securities	166,307		—			166,307
Loans	752,450		(4,622		)	747,828
Accrued interest receivable	3,102		—			3,102
Bank premises, furniture and equipment	17,805		474			18,279
Non-marketable equity securities	6,751		—			6,751
Other real estate owned	282		—			282
Intangible assets	8,454		749			9,203
Goodwill	109,091		2,210			111,301
Other assets	13,148		1,189			14,337
Total Assets	$	1,122,165	$	—		$	1,122,165

Liabilities
Deposits	$	809,366	$	—		$	809,366
Accounts payable and accrued expenses	6,284		—			6,284
Accrued interest payable and other liabilities	806		—			806
Advances from Federal Home Loan Bank	80,000		—			80,000
Junior subordinated debentures	8,609		—			8,609
Total liabilities	$	905,065	$	—		$	905,065

Preferred stock - series D	24,500		—			24,500
Total stockholders’ equity	24,500		—			24,500

Consideration
Market value of common stock issued	$	136,385	$	—		$	136,385
Cash paid	56,215		—			56,215
Total fair value of consideration	$	192,600	$	—		$	192,600

Estimated fair values of the assets acquired and liabilities assumed in this transaction as of the closing date are as follows:



	Initial Estimate		Adjustments			Revised Fair Value
Assets
Cash and cash equivalents	$	57,384	$	—		$	57,384
Investment securities	54,137		—			54,137
Loans	312,608		—			312,608
Accrued interest receivable	1,191		—			1,191
Bank premises, furniture and equipment	6,145		688			6,833
Non-marketable equity securities	2,096		—			2,096
Other real estate owned	166		—			166
Intangible assets	7,519		(1,705		)	5,814
Goodwill	23,496		23			23,519
Other assets	2,509		745			3,254
Total assets	$	467,251	$	—		$	467,002
Liabilities
Deposits	$	395,851	$	(303	)	$	395,548
Accounts payable and accrued expenses	1,287		54			1,341
Accrued interest payable and other liabilities	142		—			142
Subordinated notes⁽¹⁾	4,625		—			4,625
Total liabilities	$	401,905	$	—		$	401,656

Consideration
Market value of common stock issued	$	40,337	$	—		$	40,337
Cash paid	25,009		—			25,009
Total fair value of consideration	$	65,346	$	—		$	65,346

⁽¹⁾The subordinated note was paid off in full on December 1, 2017, subsequent to closing.

Summary of Loans Acquired in a Business Combination

The following table discloses the fair value and contractual value of loans acquired from Sovereign on August 1, 2017:



	PCI loans		Other Acquired Loans		Total Acquired Loans
Real Estate	$	17,708	$	518,261	$	535,969
Commercial	29,877		180,730		210,607
Consumer	—		1,252		1,252
Total fair value	47,585		700,243		747,828
Contractual principal balance	$	67,985	$	707,071	$	775,056

The following table presents additional information about PCI loans acquired from Sovereign on August 1, 2017:



	PCI Loans
Contractually required principal and interest	$	85,125
Non-accretable difference	33,064
Cash flows expected to be collected	$	52,061
Accretable difference	4,476
Fair value of PCI loans	$	47,585

The following table discloses the preliminary fair value and contractual value of loans acquired from Liberty on December 1, 2017:



	PCI loans		Other acquired loans		Total Acquired Loans
Real Estate	$	868	$	257,026	$	257,894
Commercial	307		49,660		49,967
Consumer	—		4,747		4,747
Total fair value	1,175		311,433		312,608
Contractual principal balance	$	1,748	$	316,119	$	317,867

The following table presents additional preliminary information about PCI loans acquired from Liberty on December 1, 2017:



	PCI Loans
Contractually required principal and interest	$	2,316
Non-accretable difference	711
Cash flows expected to be collected	$	1,605
Accretable difference	430
Fair value of PCI loans	$	1,175

Summary of Finite-Lived Intangible Assets Acquired

The following table discloses the fair value of intangible assets acquired from Sovereign on August 1, 2017:



	Gross Intangible Assets
Core deposit intangibles⁽¹⁾	$	8,452
Servicing asset⁽²⁾	317
Intangible lease assets⁽³⁾	434
	$	9,203

⁽¹⁾ The Company estimated a useful life of 7.7 years for core deposit intangibles.

⁽²⁾The Company estimated a weighted-average useful life of 6.1 years for servicing asset which will be amortized on a straight line basis.

⁽³⁾ The Company estimated a weighted-average useful life of 5.0 years for intangible lease assets which will be amortized on a straight line basis

Intangible Assets and Goodwill (Tables)

3 Months Ended

Mar. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Summary of Intangible Assets

Intangible assets in the accompanying condensed consolidated balance sheets are summarized as follows:



	As of March 31, 2018
	Weighted	Gross					Net
	Amortization	Intangible		Accumulated			Intangible
	Period	Assets		Amortization			Assets
Core deposit intangibles	8.5 years	$	16,051	$	3,081		$	12,970
Servicing asset	5.6 years	1,713		508			1,205
Intangible lease assets	3.1 years	5,281		1,084		—	4,197
		$	23,045	$	4,673		$	18,372



	As of December 31, 2017
	Weighted	Gross				Net
	Amortization	Intangible		Accumulated		Intangible
	Period	Assets		Amortization		Assets
Core deposit intangibles	8.7 years	$	17,007	$	2,694	$	14,313
Servicing asset	6.8 years	1,621		406		1,215
Intangible lease assets	3.3 years	5,281		368		4,913
		$	23,909	$	3,468	$	20,441

Summary of Changes in the Carrying Amount of Goodwill

Changes in the carrying amount of goodwill are summarized as follows for the three months ended March 31, 2018:



	March 31, 2018
Beginning of period	$	159,452
Effect of Sovereign acquisition	2,210
Effect of Liberty acquisition	23
End of period	$	161,685

Branch Assets and Liabilities Held For Sale (Tables)

3 Months Ended

Mar. 31, 2018

Discontinued Operations and Disposal Groups [Abstract]

Summary of Branch Assets and Liabilities Held for Sale

The following table presents the assets and liabilities held for sale as of March 31, 2018 and December 31, 2017:



	March 31, 2018		December 31, 2017
Assets
Cash and cash equivalents	$	—	$	334
Loans	—		26,313
Accrued interest receivable	—		63
Bank premises, furniture and equipment	1,753		5,118
Intangible assets	—		1,724
Total assets	$	1,753	$	33,552
Liabilities
Deposits	$	—	$	64,282
Accounts payable and accrued expenses	—		2
Deferred tax liability	—		327
Accrued interest payable and other liabilities	—		16
Total liabilities	$	—	$	64,627

- Definition

Tabular disclosure of information related to a disposal group. Includes, but is not limited to, a discontinued operation, disposal classified as held-for-sale or disposed of by means other than sale or disposal of an individually significant component.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=65878427&loc=SL51721533-107759

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 4B
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721665-107760

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=64827811&loc=d3e1474-107760

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=64827811&loc=d3e1361-107760

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721683-107760

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 3A
-URI http://asc.fasb.org/extlink&oid=84176398&loc=SL51724579-110230

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 5C
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721675-107760

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 4A
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721663-107760

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=84176398&loc=d3e2941-110230

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 5B
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721673-107760

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 3A
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721659-107760

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 5A
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721671-107760

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 5D
-URI http://asc.fasb.org/extlink&oid=64827811&loc=SL51721677-107760

+ Details

Summary of Significant Accounting Policies - Additional Information (Details)	3 Months Ended
	Mar. 31, 2018 segment mortgage_office branch
Nature of Organization:
Number of reportable segments \| segment	1
Dallas-Fort Worth
Nature of Organization:
Number of branches	20
Number of mortgage offices \| mortgage_office	1
Houston
Nature of Organization:
Number of branches	1

Summary of Significant Accounting Policies - Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Earnings (numerator)
Net income	$ 10,388	$ 3,098
Shares (denominator) in thousands
Weighted average shares outstanding for basic EPS (thousands) (in shares)	24,120	15,200
Dilutive effect of employee stock based awards (in shares)	419	432
Adjusted weighted average shares outstanding (in shares)	24,539	15,632
Earnings per share:
Basic (in dollars per share)	$ 0.43	$ 0.20
Diluted (in dollars per share)	$ 0.42	$ 0.20

Summary of Significant Accounting Policies - Antidilutive Securities (Details) - shares	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Accounting Policies [Abstract]
Excluded from diluted EPS weighted average shares (in shares)	0	0

Supplemental Statement of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Supplemental Disclosures of Cash Flow Information:
Cash paid for interest	$ 4,928	$ 1,834
Supplemental Disclosures of Non-Cash Flow Information:
Net foreclosure of other real estate owned and repossessed assets	8	336
Noncash assets acquired
Loans	(4,622)	0
Bank premises, furniture and equipment	1,162	0
Intangible assets	(956)	0
Goodwill	2,233	0
Other assets	1,934	0
Noncash liabilities assumed:
Deposits	(303)	0
Accrued interest payable and other liabilities	$ 54	$ 0

Investment Securities - Carrying Amount and Fair Values (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Available for Sale securities
Amortized Cost	$ 247,735	$ 229,737
Gross Unrealized Gains	191	602
Gross Unrealized Losses	4,762	2,222
Fair Value	243,164	228,117
U.S. government agencies
Available for Sale securities
Amortized Cost	10,362	10,829
Gross Unrealized Gains	0	9
Gross Unrealized Losses	181	18
Fair Value	10,181	10,820
Corporate bonds
Available for Sale securities
Amortized Cost	20,852	17,500
Gross Unrealized Gains	98	330
Gross Unrealized Losses	10	0
Fair Value	20,940	17,830
Municipal securities
Available for Sale securities
Amortized Cost	44,878	55,499
Gross Unrealized Gains	44	189
Gross Unrealized Losses	445	211
Fair Value	44,477	55,477
Mortgage-backed securities
Available for Sale securities
Amortized Cost	94,406	91,734
Gross Unrealized Gains	37	58
Gross Unrealized Losses	2,448	1,068
Fair Value	91,995	90,724
Collateralized mortgage obligations
Available for Sale securities
Amortized Cost	76,651	53,559
Gross Unrealized Gains	6	9
Gross Unrealized Losses	1,678	925
Fair Value	74,979	52,643
Asset-backed securities
Available for Sale securities
Amortized Cost	586	616
Gross Unrealized Gains	6	7
Gross Unrealized Losses	0	0
Fair Value	$ 592	$ 623

Investment Securities - Unrealized Loss Position (Details) $ in Thousands	Mar. 31, 2018 USD ($) investment	Dec. 31, 2017 USD ($) investment
Fair Value
Less Than 12 Months, Fair Value	$ 130,991	$ 101,719
12 Months or More, Fair Value	52,146	57,511
Total Fair Value	183,137	159,230
Unrealized Loss
Less Than 12 Months, Unrealized Loss	2,776	991
12 Months or More, Unrealized Loss	1,986	1,231
Total Unrealized Loss	$ 4,762	$ 2,222
Number of investment positions in an unrealized loss position \| investment	142	118
U.S. government agencies
Fair Value
Less Than 12 Months, Fair Value	$ 9,606	$ 3,470
12 Months or More, Fair Value	576	629
Total Fair Value	10,182	4,099
Unrealized Loss
Less Than 12 Months, Unrealized Loss	161	4
12 Months or More, Unrealized Loss	20	14
Total Unrealized Loss	181	18
Corporate bonds
Fair Value
Less Than 12 Months, Fair Value	3,990
12 Months or More, Fair Value	0
Total Fair Value	3,990
Unrealized Loss
Less Than 12 Months, Unrealized Loss	10
12 Months or More, Unrealized Loss	0
Total Unrealized Loss	10
Municipal securities
Fair Value
Less Than 12 Months, Fair Value	27,412	14,593
12 Months or More, Fair Value	5,406	7,092
Total Fair Value	32,818	21,685
Unrealized Loss
Less Than 12 Months, Unrealized Loss	257	79
12 Months or More, Unrealized Loss	188	132
Total Unrealized Loss	445	211
Mortgage-backed securities
Fair Value
Less Than 12 Months, Fair Value	61,666	52,075
12 Months or More, Fair Value	23,140	29,485
Total Fair Value	84,806	81,560
Unrealized Loss
Less Than 12 Months, Unrealized Loss	1,592	513
12 Months or More, Unrealized Loss	856	555
Total Unrealized Loss	2,448	1,068
Collateralized mortgage obligations
Fair Value
Less Than 12 Months, Fair Value	28,317	31,581
12 Months or More, Fair Value	23,024	20,305
Total Fair Value	51,341	51,886
Unrealized Loss
Less Than 12 Months, Unrealized Loss	756	395
12 Months or More, Unrealized Loss	922	530
Total Unrealized Loss	$ 1,678	$ 925

Investment Securities - Maturities (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Amortized Cost
Due in one year or less	$ 2,265	$ 2,328
Due from one year to five years	23,624	29,654
Due from five years to ten years	27,624	34,480
Due after ten years	22,579	17,366
Total investment securities available for sale, single maturity date	76,092	83,828
Total investment securities available for sale, amortized cost basis	247,735	229,737
Fair Value
Due in one year or less	2,271	2,330
Due from one year to five years	23,548	29,991
Due from five years to ten years	27,449	34,474
Due after ten years	22,330	17,332
Total investment securities available for sale	75,598	84,127
Total investment securities available for sale, fair value	243,164	228,117
Mortgage-backed securities
Amortized Cost
Amortized cost	94,406	91,734
Fair Value
Fair value	91,995	90,724
Collateralized mortgage obligations
Amortized Cost
Amortized cost	76,651	53,559
Fair Value
Fair value	74,979	52,643
Asset-backed securities
Amortized Cost
Amortized cost	586	616
Fair Value
Fair value	$ 592	$ 623

Investment Securities - Proceeds and Gross Gains/Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Proceeds from sales of investment securities available for sale and gross gains and losses
Proceeds from sales	$ 30,149	$ 0
Gross realized gains	323	0
Gross realized losses	$ 315	$ 0

Loans and Allowance for Loan Losses - Balance Sheet Summary (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Loans and Allowance for Loan Losses
Loans, gross	$ 2,316,089	$ 2,233,518
Deferred loan fees	(24)	(28)
Allowance for loan losses	13,401	12,808	$ 8,816	$ 8,524
Loans, net	2,302,664	2,220,682
Accretable discount related to loans acquired within a business combination	14,571	12,135
Loans and Leases Receivable, Retained Loans from Loan Sales, Discount	1,771	1,189
Commercial
Loans and Allowance for Loan Losses
Loans, gross	672,820	684,551
Allowance for loan losses	5,401	5,588	3,296	2,955
Consumer
Loans and Allowance for Loan Losses
Loans, gross	8,051	9,648
Allowance for loan losses	22	22	34	35
Construction and land \| Real Estate
Loans and Allowance for Loan Losses
Loans, gross	301,023	277,825
Farmland \| Real Estate
Loans and Allowance for Loan Losses
Loans, gross	9,366	9,385
Real estate \| Real Estate
Loans and Allowance for Loan Losses
Loans, gross	369,288	342,817
Allowance for loan losses	1,590	1,473	1,154	1,116
Commercial Real Estate \| Real Estate
Loans and Allowance for Loan Losses
Loans, gross	955,541	909,292
Allowance for loan losses	4,962	4,410	$ 3,031	$ 3,003
1 - 4 family residential \| Real estate \| Real Estate
Loans and Allowance for Loan Losses
Loans, gross	246,806	236,542
Multi-family residential \| Real estate \| Real Estate
Loans and Allowance for Loan Losses
Loans, gross	$ 122,482	$ 106,275

Loans and Allowance for Loan Losses - Nonaccrual (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Loans and Allowance for Loan Losses
Non-accrual loans	$ 3,438	$ 465
Commercial
Loans and Allowance for Loan Losses
Non-accrual loans	605	398
Consumer
Loans and Allowance for Loan Losses
Non-accrual loans	5	6
Construction and land \| Real Estate
Loans and Allowance for Loan Losses
Non-accrual loans	2,769	0
Farmland \| Real Estate
Loans and Allowance for Loan Losses
Non-accrual loans	0	0
Real estate \| 1 - 4 family residential \| Real Estate
Loans and Allowance for Loan Losses
Non-accrual loans	0	0
Real estate \| Multi-family residential \| Real Estate
Loans and Allowance for Loan Losses
Non-accrual loans	0	0
Commercial Real Estate \| Real Estate
Loans and Allowance for Loan Losses
Non-accrual loans	$ 59	$ 61

Loans and Allowance for Loan Losses - Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2016	Dec. 31, 2017
Impaired Loans
Unpaid Contractual Principal Balance	$ 4,038		$ 1,068
Recorded Investment with No Allowance	3,779		952
Recorded Investment With Allowance	259		116
Total Recorded Investment	4,038		1,068
Related Allowance	66		12
Average Recorded Investment YTD	4,080	$ 1,194
Commercial
Impaired Loans
Unpaid Contractual Principal Balance	605		398
Recorded Investment with No Allowance	346		282
Recorded Investment With Allowance	259		116
Total Recorded Investment	605		398
Related Allowance	66		12
Average Recorded Investment YTD	638	499
Consumer
Impaired Loans
Unpaid Contractual Principal Balance	74		75
Recorded Investment with No Allowance	74		75
Recorded Investment With Allowance	0		0
Total Recorded Investment	74		75
Related Allowance	0		0
Average Recorded Investment YTD	78	87
Construction and land \| Real Estate
Impaired Loans
Unpaid Contractual Principal Balance	2,769		0
Recorded Investment with No Allowance	2,769		0
Recorded Investment With Allowance	0		0
Total Recorded Investment	2,769		0
Related Allowance	0		0
Average Recorded Investment YTD	2,769	0
Farmland \| Real Estate
Impaired Loans
Unpaid Contractual Principal Balance	0		0
Recorded Investment with No Allowance	0		0
Recorded Investment With Allowance	0		0
Total Recorded Investment	0		0
Related Allowance	0		0
Average Recorded Investment YTD	0	0
Commercial Real Estate \| Real Estate
Impaired Loans
Unpaid Contractual Principal Balance	429		434
Recorded Investment with No Allowance	429		434
Recorded Investment With Allowance	0		0
Total Recorded Investment	429		434
Related Allowance	0		0
Average Recorded Investment YTD	434	445
1 - 4 family residential \| Real estate \| Real Estate
Impaired Loans
Unpaid Contractual Principal Balance	161		161
Recorded Investment with No Allowance	161		161
Recorded Investment With Allowance	0		0
Total Recorded Investment	161		161
Related Allowance	0		0
Average Recorded Investment YTD	161	163
Multi-family residential \| Real estate \| Real Estate
Impaired Loans
Unpaid Contractual Principal Balance	0		0
Recorded Investment with No Allowance	0		0
Recorded Investment With Allowance	0		0
Total Recorded Investment	0		0
Related Allowance	0		$ 0
Average Recorded Investment YTD	$ 0	$ 0

Loans and Allowance for Loan Losses - Troubled Debt Restructuring (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) Loan	Mar. 31, 2017 Loan	Dec. 31, 2017 USD ($)
Receivables [Abstract]
Recorded investment in TDRs \| $	$ 613		$ 618
Number of loans modified as TDRs for which there was a payment default \| Loan	0	0

Loans and Allowance for Loan Losses - Credit Quality Indicators (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Credit Quality Indicators
Loans	$ 2,316,089	$ 2,233,518
Pass
Credit Quality Indicators
Loans	2,242,399	2,155,437
Special Mention
Credit Quality Indicators
Loans	26,739	28,209
Substandard
Credit Quality Indicators
Loans	5,001	2,144
Doubtful
Credit Quality Indicators
Loans	0	116
PCI
Credit Quality Indicators
Loans	41,950	47,612
Commercial
Credit Quality Indicators
Loans	672,820	684,551
Commercial \| Pass
Credit Quality Indicators
Loans	629,792	634,796
Commercial \| Special Mention
Credit Quality Indicators
Loans	17,039	18,337
Commercial \| Substandard
Credit Quality Indicators
Loans	1,174	1,155
Commercial \| Doubtful
Credit Quality Indicators
Loans	0	116
Commercial \| PCI
Credit Quality Indicators
Loans	24,815	30,147
Consumer
Credit Quality Indicators
Loans	8,051	9,648
Consumer \| Pass
Credit Quality Indicators
Loans	7,952	9,540
Consumer \| Special Mention
Credit Quality Indicators
Loans	0	0
Consumer \| Substandard
Credit Quality Indicators
Loans	99	108
Consumer \| Doubtful
Credit Quality Indicators
Loans	0	0
Consumer \| PCI
Credit Quality Indicators
Loans	0	0
Construction and land \| Real Estate
Credit Quality Indicators
Loans	301,023	277,825
Construction and land \| Real Estate \| Pass
Credit Quality Indicators
Loans	297,572	277,186
Construction and land \| Real Estate \| Special Mention
Credit Quality Indicators
Loans	682	639
Construction and land \| Real Estate \| Substandard
Credit Quality Indicators
Loans	2,769	0
Construction and land \| Real Estate \| Doubtful
Credit Quality Indicators
Loans	0	0
Construction and land \| Real Estate \| PCI
Credit Quality Indicators
Loans	0	0
Farmland \| Real Estate
Credit Quality Indicators
Loans	9,366	9,385
Farmland \| Real Estate \| Pass
Credit Quality Indicators
Loans	9,328	9,336
Farmland \| Real Estate \| Special Mention
Credit Quality Indicators
Loans	0	0
Farmland \| Real Estate \| Substandard
Credit Quality Indicators
Loans	0	0
Farmland \| Real Estate \| Doubtful
Credit Quality Indicators
Loans	0	0
Farmland \| Real Estate \| PCI
Credit Quality Indicators
Loans	38	49
Real estate \| Real Estate
Credit Quality Indicators
Loans	369,288	342,817
Real estate \| 1 - 4 family residential \| Real Estate
Credit Quality Indicators
Loans	246,806	236,542
Real estate \| 1 - 4 family residential \| Real Estate \| Pass
Credit Quality Indicators
Loans	246,103	235,781
Real estate \| 1 - 4 family residential \| Real Estate \| Special Mention
Credit Quality Indicators
Loans	410	462
Real estate \| 1 - 4 family residential \| Real Estate \| Substandard
Credit Quality Indicators
Loans	197	200
Real estate \| 1 - 4 family residential \| Real Estate \| Doubtful
Credit Quality Indicators
Loans	0	0
Real estate \| 1 - 4 family residential \| Real Estate \| PCI
Credit Quality Indicators
Loans	96	99
Real estate \| Multi-family residential \| Real Estate
Credit Quality Indicators
Loans	122,482	106,275
Real estate \| Multi-family residential \| Real Estate \| Pass
Credit Quality Indicators
Loans	122,482	106,275
Real estate \| Multi-family residential \| Real Estate \| Special Mention
Credit Quality Indicators
Loans	0	0
Real estate \| Multi-family residential \| Real Estate \| Substandard
Credit Quality Indicators
Loans	0	0
Real estate \| Multi-family residential \| Real Estate \| Doubtful
Credit Quality Indicators
Loans	0	0
Real estate \| Multi-family residential \| Real Estate \| PCI
Credit Quality Indicators
Loans	0	0
Commercial Real Estate \| Real Estate
Credit Quality Indicators
Loans	955,541	909,292
Commercial Real Estate \| Real Estate \| Pass
Credit Quality Indicators
Loans	929,170	882,523
Commercial Real Estate \| Real Estate \| Special Mention
Credit Quality Indicators
Loans	8,608	8,771
Commercial Real Estate \| Real Estate \| Substandard
Credit Quality Indicators
Loans	762	681
Commercial Real Estate \| Real Estate \| Doubtful
Credit Quality Indicators
Loans	0	0
Commercial Real Estate \| Real Estate \| PCI
Credit Quality Indicators
Loans	17,001	17,317
PCI loans
Credit Quality Indicators
Loans	$ 54,690	63,940
Scenario, Adjustment \| Real estate \| 1 - 4 family residential \| Real Estate \| Pass
Credit Quality Indicators
Loans		(15,123)
Scenario, Adjustment \| Real estate \| Multi-family residential \| Real Estate \| Pass
Credit Quality Indicators
Loans		$ 15,123

Loans and Allowance for Loan Losses - Allowance (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Analysis of allowance for loan losses
Balance at beginning of period	$ 12,808	$ 8,524
Provision (recapture) charged to earnings	678	890	$ 5,114
Charge-offs	(94)	(603)	(839)
Recoveries	9	5	9
Net charge-offs (recoveries)	(85)	(598)	(830)
Balance at end of period	13,401	8,816	8,524
Specific reserves:
Total specific reserves				$ 66	$ 12	$ 136
General reserves				13,335	12,796	8,680
Total	12,808	8,524	8,524	$ 13,401	$ 12,808	$ 8,816
Allowance for loan losses (as a percent)				0.58%	0.57%	0.86%
Commercial
Analysis of allowance for loan losses
Balance at beginning of period	5,588	2,955
Provision (recapture) charged to earnings	(102)	939	3,452
Charge-offs	(94)	(603)	(828)
Recoveries	9	5	9
Net charge-offs (recoveries)	(85)	(598)	(819)
Balance at end of period	5,401	3,296	2,955
Specific reserves:
Total specific reserves				$ 66	$ 12	$ 133
General reserves				5,335	5,576	3,163
Total	5,588	2,955	2,955	5,401	5,588	3,296
Consumer
Analysis of allowance for loan losses
Balance at beginning of period	22	35
Provision (recapture) charged to earnings	0	(1)	(13)
Charge-offs	0	0	0
Recoveries	0	0	0
Net charge-offs (recoveries)	0	0	0
Balance at end of period	22	34	35
Specific reserves:
Total specific reserves				0	0	3
General reserves				22	22	31
Total	22	35	35	22	22	34
Construction, Land and Farmland \| Real Estate
Analysis of allowance for loan losses
Balance at beginning of period	1,315	1,415
Provision (recapture) charged to earnings	111	(114)	(100)
Charge-offs	0	0	0
Recoveries	0	0	0
Net charge-offs (recoveries)	0	0	0
Balance at end of period	1,426	1,301	1,415
Specific reserves:
Total specific reserves				0	0	0
General reserves				1,426	1,315	1,301
Total	1,315	1,415	1,415	1,426	1,315	1,301
Residential \| Real Estate
Analysis of allowance for loan losses
Balance at beginning of period	1,473	1,116
Provision (recapture) charged to earnings	117	38	368
Charge-offs	0	0	(11)
Recoveries	0	0	0
Net charge-offs (recoveries)	0	0	(11)
Balance at end of period	1,590	1,154	1,116
Specific reserves:
Total specific reserves				0	0	0
General reserves				1,590	1,473	1,154
Total	1,473	1,116	1,116	1,590	1,473	1,154
Commercial Real Estate \| Real Estate
Analysis of allowance for loan losses
Balance at beginning of period	4,410	3,003
Provision (recapture) charged to earnings	552	28	1,407
Charge-offs	0	0	0
Recoveries	0	0	0
Net charge-offs (recoveries)	0	0	0
Balance at end of period	4,962	3,031	3,003
Specific reserves:
Total specific reserves				0	0	0
General reserves				4,962	4,410	3,031
Total	$ 4,410	$ 3,003	$ 3,003	$ 4,962	$ 4,410	$ 3,031

Loans and Allowance for Loan Losses - Allowance, Additional Information (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Allowance, impairment methodology
Loans individually evaluated for impairment	$ 4,038	$ 1,068
Loans collectively evaluated for impairment	2,270,101	2,184,838
Loans, gross	2,316,089	2,233,518
Commercial
Allowance, impairment methodology
Loans individually evaluated for impairment	605	398
Loans collectively evaluated for impairment	647,400	654,006
Loans, gross	672,820	684,551
Consumer
Allowance, impairment methodology
Loans individually evaluated for impairment	74	75
Loans collectively evaluated for impairment	7,977	9,573
Loans, gross	8,051	9,648
Construction, Land and Farmland \| Real Estate
Allowance, impairment methodology
Loans individually evaluated for impairment	2,769	0
Loans collectively evaluated for impairment	307,582	287,161
Loans, gross	310,389	287,210
Residential \| Real Estate
Allowance, impairment methodology
Loans individually evaluated for impairment	161	161
Loans collectively evaluated for impairment	369,031	342,557
Loans, gross	369,288	342,817
Commercial Real Estate \| Real Estate
Allowance, impairment methodology
Loans individually evaluated for impairment	429	434
Loans collectively evaluated for impairment	938,111	891,541
Loans, gross	955,541	909,292
PCI loans
Allowance, impairment methodology
Loans Receivable, Net	41,950	47,612
Loans, gross	54,690	63,940
PCI loans \| Commercial
Allowance, impairment methodology
Loans Receivable, Net	24,815	30,147
PCI loans \| Consumer
Allowance, impairment methodology
Loans Receivable, Net	0	0
PCI loans \| Construction, Land and Farmland \| Real Estate
Allowance, impairment methodology
Loans Receivable, Net	38	49
PCI loans \| Residential \| Real Estate
Allowance, impairment methodology
Loans Receivable, Net	96	99
PCI loans \| Commercial Real Estate \| Real Estate
Allowance, impairment methodology
Loans Receivable, Net	$ 17,001	$ 17,317

Loans and Allowance For Loan Losses - PCI Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans	$ 2,316,089	$ 2,233,518
Receivables Acquired with Deteriorated Credit Quality
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans Receivable, Net	41,950	47,612
Loans	$ 54,690	$ 63,940

Loans and Allowance for Loan Losses - PCI Accretable Yield Rollforward (Details)	3 Months Ended
	Mar. 31, 2018 USD ($)
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance at beginning of period	$ 2,723
Purchase accounting adjustments	1,414
Reclassifications from nonaccretable	5,870
Accretion	(1,868)
Balance at end of period	$ 8,139

Loans and Allowance for Loan Losses - Servicing Assets (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Servicing Asset at Amortized Cost [Line Items]
Servicing asset	$ 74,946,000	$ 39,000
Summary of changes in related servicing assets
Balance at beginning of period	1,215,000	601,000
Increase from loan sales	92,000	137,000
Amortization charged to income	(102,000)	(56,000)
Balance at end of period	1,205,000	682,000
Valuation allowance recorded	0	$ 0
Interest receivable	7,127,000		$ 7,676,000
Interest-only strip
Summary of changes in related servicing assets
Interest receivable	$ 0		$ 0

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
Income Taxes (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Income Tax Examination [Line Items]
Estimated annual effective tax rate (as a percent)	20.50%	34.20%
Effective tax rate (as a percent)	25.30%	30.40%
Tax receivable	$ 4,048
Net deferred tax asset			$ 4,937
Deferred tax liabilities, net			327
Other assets
Income Tax Examination [Line Items]
Net deferred tax asset	6,681
Accrued interest payable and other liabilities
Income Tax Examination [Line Items]
Current tax receivable			$ 7,085
Sovereign Bancshares, Inc and Liberty Bancshares, Inc. [Member]
Income Tax Examination [Line Items]
Effective income tax rate reconciliation, change in enacted tax rate, amount	$ 820

Commitments and Contingencies (Details) - USD ($)	3 Months Ended
Commitments and Contingencies (Details) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Loss Contingency Accrual [Roll Forward]
Qualified affordable housing investment	$ 1,938,000	$ 1,982,000
Qualified affordable housing project investments, unfunded commitment	1,652,000	$ 1,765,000
Cease-Use
Loss Contingency Accrual [Roll Forward]
Balance as of December 31, 2017	1,407,000
Payments	(35,000)
Reversal upon lease assignment	(669,000)
Balance as of March 31, 2018	$ 703,000

Fair Value Disclosures - Recurring Basis (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Assets measured at fair value
Investment securities available for sale	$ 243,164,000		$ 228,117,000
Recurring
Assets measured at fair value
Investment securities available for sale	243,164,000		228,117,000
Liabilities measured at fair value	0		0
Transfer of assets from Level 2 to Level 3	0	$ 0
Transfer of assets from Level 3 to Level 2	0	$ 0
Recurring \| Level 1 Inputs
Assets measured at fair value
Investment securities available for sale	0		0
Recurring \| Level 2 Inputs
Assets measured at fair value
Investment securities available for sale	243,164,000		228,117,000
Recurring \| Level 3 Inputs
Assets measured at fair value
Investment securities available for sale	$ 0		$ 0

Fair Value Disclosures - Non-recurring Basis (Details) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Assets measured at fair value
Impaired loans, specific allowance	$ 66,000	$ 12,000
Non-recurring
Assets measured at fair value
Impaired loans	259,000	116,000
Other real estate owned	10,000	449,000
Liabilities measured at fair value	0	0
Non-recurring \| Level 1 Inputs
Assets measured at fair value
Impaired loans	0	0
Other real estate owned	0	0
Non-recurring \| Level 2 Inputs
Assets measured at fair value
Impaired loans	0	0
Other real estate owned	0	0
Non-recurring \| Level 3 Inputs
Assets measured at fair value
Impaired loans	259,000	116,000
Other real estate owned	$ 10,000	$ 449,000

Fair Value Disclosures - Level 3 (Details) - Collateral Method - Level 3 - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Impaired loans
Significant unobservable inputs used in the fair value measurements
Fair Value	$ 259	$ 116
Weighted Average (as a percent)	8.00%	8.00%
Other Real Estate Owned
Significant unobservable inputs used in the fair value measurements
Fair Value	$ 10	$ 449
Weighted Average (as a percent)	8.00%	8.00%

Fair Value Disclosures - Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Financial assets:
Financial instruments, assets held for sale	$ 1,753	$ 31,828
Financial liabilities:
Junior subordinated debentures	11,702	11,702
Subordinated notes	4,988	4,987
Other borrowings	0	15,000
Branch liabilities held for sale	0	64,627
Carrying Amount
Financial assets:
Cash and cash equivalents	195,194	149,044
Loans held for sale	893	841
Loans, net	2,302,664	2,220,682
Accrued interest receivable	7,127	7,676
Bank-owned life insurance	21,620	21,476
Servicing asset	1,205	1,243
Non-marketable equity securities	20,806	13,732
Financial liabilities:
Deposits	2,493,794	2,278,630
Advances from FHLB	48,128	71,164
Accrued interest payable	471	445
Junior subordinated debentures	11,702	11,702
Subordinated notes	4,988	4,987
Other borrowings		15,000
Branch liabilities held for sale		64,300
Level 1 Inputs \| Fair Value
Financial assets:
Cash and cash equivalents	0	0
Loans held for sale	0	0
Loans, net	0	0
Accrued interest receivable	0	0
Bank-owned life insurance	0	0
Servicing asset	0	0
Non-marketable equity securities	0	0
Financial instruments, assets held for sale		0
Financial liabilities:
Deposits	0	0
Advances from FHLB	0	0
Accrued interest payable	0	0
Junior subordinated debentures	0	0
Subordinated notes	0	0
Other borrowings		0
Branch liabilities held for sale		0
Level 2 Inputs \| Fair Value
Financial assets:
Cash and cash equivalents	195,194	149,044
Loans held for sale	893	841
Loans, net	0
Accrued interest receivable	7,127	7,676
Bank-owned life insurance	21,620	21,476
Servicing asset	1,205	1,243
Non-marketable equity securities	20,806	13,732
Financial instruments, assets held for sale	1,753	5,515
Financial liabilities:
Deposits	2,425,559	2,164,498
Advances from FHLB	48,173	70,110
Accrued interest payable	471	445
Junior subordinated debentures	11,702	11,702
Subordinated notes	4,988	4,987
Other borrowings		15,000
Branch liabilities held for sale		64,300
Level 3 Inputs \| Fair Value
Financial assets:
Cash and cash equivalents	0	0
Loans held for sale	0	0
Loans, net	2,316,438	2,234,094
Accrued interest receivable	0	0
Bank-owned life insurance	0	0
Servicing asset	0	0
Non-marketable equity securities	0	0
Financial instruments, assets held for sale	0	26,313
Financial liabilities:
Deposits	0	0
Advances from FHLB	0	0
Accrued interest payable	0	0
Junior subordinated debentures	0	0
Subordinated notes	$ 0	0
Other borrowings		0
Branch liabilities held for sale		$ 0

Financial Instruments with Off-Balance Sheet Risk (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Financial instruments with off-balance sheet risk
Total commitments	$ 635,737	$ 615,750
Commitments to extend credit
Financial instruments with off-balance sheet risk
Total commitments	625,590	606,451
Standby and commercial letters of credit
Financial instruments with off-balance sheet risk
Total commitments	$ 10,147	$ 9,299

Stock and Incentive Plans - 2010 Plan (Details) - 2010 Stock Option and Equity Incentive Plan - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense	$ 5	$ 22
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares awarded (in shares)	0	0
Nonperformance-based stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares awarded under stock options (in shares)	0	0
Performance Based Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares awarded under stock options (in shares)	0	0

Stock and Incentive Plans - 2010 Plan - Options (Details) - Nonperformance-based stock options - 2010 Stock Option and Equity Incentive Plan - USD ($)			3 Months Ended
	Jan. 01, 2018	Jan. 01, 2017	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Shares Underlying Options
Outstanding at beginning of period (in shares)	305,000	325,500	305,000	325,500
Exercised during the period (in shares)			(9,000)	(15,000)
Outstanding at the end of period (in shares)			296,000	310,500
Options exercisable at end of period (in shares)			290,000
Weighted Exercise Price
Outstanding at beginning of period (in dollars per share)	$ 10.16	$ 10.15	$ 10.16	$ 10.15
Exercised during the period (in dollars per share)			10.38	10.00
Outstanding at the end of period (in dollars per share)			10.16	$ 10.16
Options exercisable at end of period (in dollars per share)			$ 10.12
Weighted Average Contractual Term
Weighted Average Contractual Term	3 years 7 months 2 days	4 years 6 months 22 days	3 years 3 months 22 days	4 years 4 months 2 days
Weighted Average Contractual Term			3 years 3 months
Additional disclosures
Aggregate intrinsic value of outstanding stock options			$ 5,183,000
Aggregate intrinsic value of exercisable stock options			5,091,000
Unrecognized compensation expense			$ 7,000	$ 18,000	$ 8,000
Requisite service period to recognize compensation cost			1 year 7 days
Share-based compensation arrangement by share-based payment award, options, exercises in period, intrinsic value			$ 156
Fair Value of Options Exercised or Restricted Stock Units Vested			255,000	422,000
Fair Value of Options Exercised or Restricted Stock Units Vested			$ 245,000	$ 26,000

Stock and Incentive Plans - 2010 Plan - Restricted Stock Units (Details) - Restricted Stock Units - 2010 Stock Option and Equity Incentive Plan - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Units
Nonvested at the beginning of the period (in shares)	24,250	27,750
Vested during the period (in shares)	(8,750)	(1,000)
Forfeited during the period (in shares)	(500)
Nonvested at the end of the period (in shares)	15,000	26,750
Weighted Average Grant Date Fair Value
Nonvested at the beginning of the period (in dollars per share)	$ 13.19	$ 11.92
Vested during the period (in dollars per share)	10.85	10.85
Forfeited during the period (in dollars per share)	10.85
Nonvested at the end of the period (in dollars per share)	$ 14.99	$ 11.96
Additional disclosures
Unrecognized compensation expense	$ 12	$ 71	$ 15

Stock and Incentive Plans - Omnibus Plan (Details) - Omnibus Plan - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Non-performance based restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares awarded (in shares)	34,500	22,500
Non-performance based restricted stock units \| Equal annual installments, tranche one
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Performance based restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares awarded (in shares)	40,269	25,522
Performance based restricted stock units \| Market condition based on the Company's total shareholder return relative to a market index
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Stock option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares awarded under stock options (in shares)	112,593	55,440
Stock based compensation expense	$ 766
Market condition restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares awarded (in shares)		25,522
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense		$ 375

Stock and Incentive Plans - Omnibus Plan Black Scholes Assumptions - (Details) - Omnibus Plan	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Assumptions used to measure fair value of each option award estimated on grant date using Black-Scholes option-pricing model
Dividend yield (as a percent)	0.00%	0.00%
Expected volatility, minimum (as a percent)	27.87%	32.82%
Expected volatility, maximum (as a percent)	37.55%	37.55%
Risk-free interest rate, minimum (as a percent)	1.06%	1.06%
Risk-free interest rate, maximum (as a percent)	2.73%	2.32%
Minimum
Assumptions used to measure fair value of each option award estimated on grant date using Black-Scholes option-pricing model
Expected life	5 years	5 years
Maximum
Assumptions used to measure fair value of each option award estimated on grant date using Black-Scholes option-pricing model
Expected life	7 years 6 months	7 years 6 months

Stock and Incentive Plans - Omnibus Plan - Options (Details) - Omnibus Plan - Nonperformance-based stock options - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended
	Jan. 01, 2018	Jan. 01, 2017	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Shares Underlying Options
Outstanding at beginning of period (in shares)	332,706	128,366	332,706	128,366
Granted during the period (in shares)			112,593	55,440
Exercised during the period (in shares)			(1,983)
Outstanding at the end of period (in shares)			443,316	183,806
Options exercisable at end of period (in shares)			104,395.62
Weighted Exercise Price
Outstanding at beginning of period (in dollars per share)	$ 22.71	$ 15.32	$ 22.71	$ 15.32
Granted during the period (in dollars per share)			27.63	26.92
Exercised during the period (in dollars per share)			14.95
Outstanding at the end of period (in dollars per share)			23.95	$ 18.82
Options exercisable at end of period (in dollars per share)			17.21
Weighted average fair value of options granted during the period (in dollars per share)			$ 9.38
Weighted Average Contractual Term
Weighted Average Contractual Term	8 years 10 months 10 days	8 years 8 months 9 days	8 years 10 months 21 days	8 years 10 months 6 days
Weighted Average Contractual Term			7 years 6 months 22 days
Additional disclosures
Aggregate intrinsic value of outstanding stock options			$ 1,629		$ 1,614
Share-based compensation arrangement by share-based payment award, options, exercises in period, intrinsic value			25
Aggregate intrinsic value of exercisable stock options			$ 1,092

Stock and Incentive Plans - Omnibus Plan - Restricted Stock Units (Details) - Omnibus Plan - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Non-performance based restricted stock units
Units
Nonvested at the beginning of the period (in shares)	150,722	67,956
Granted during the period (in shares)	34,500	22,500
Vested during the period (in shares)	(8,399)	(5,350)
Nonvested at the end of the period (in shares)	176,823	85,106
Weighted Average Grant Date Fair Value
Nonvested at the beginning of the period (in dollars per share)	$ 13.29	$ 13.79
Granted during the period (in dollars per share)	28.05	27.84
Vested during the period (in dollars per share)	25.13	4.38
Nonvested at the end of the period (in dollars per share)	$ 15.61	$ 18.09
Performance based restricted stock units
Units
Nonvested at the beginning of the period (in shares)	53,594	51,197
Granted during the period (in shares)	40,269	25,522
Vested during the period (in shares)	(26,623)	(19,861)
Nonvested at the end of the period (in shares)	67,240	56,858
Weighted Average Grant Date Fair Value
Nonvested at the beginning of the period (in dollars per share)	$ 8.72	$ 8.72
Granted during the period (in dollars per share)	27.59	24.34
Vested during the period (in dollars per share)	18.83	15.34
Nonvested at the end of the period (in dollars per share)	$ 16.01	$ 13.42
Stock option
Additional disclosures
Unrecognized compensation expense	$ 2,806		$ 1,958
Requisite service period to recognize compensation cost	2 years 8 months 5 days
Restricted Stock Units
Additional disclosures
Unrecognized compensation expense	$ 5,097	$ 2,058	$ 3,592

Stock and Incentive Plans - Fair Value Options Exercised or Restricted Stock Units Vested (Details) - Omnibus Plan - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Non-performance based restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair Value of Options Exercised or Restricted Stock Units Vested	$ 0	$ 0
Fair Value of Options Exercised or Restricted Stock Units Vested	1	1
Performance based restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair Value of Options Exercised or Restricted Stock Units Vested	$ 0	$ 0

Capital Requirements and Restrictions on Retained Earnings (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Total capital (to risk weighted assets)
Actual Amount	$ 351,078	$ 342,521
Actual Ratio (as a percent)	13.17%	13.16%
For Capital Adequacy Purposes Amount	$ 213,259	$ 208,219
For Capital Adequacy Purposes Ratio (as a percent)	8.00%	8.00%
Tier 1 capital (to risk weighted assets)
Actual Amount	$ 332,690	$ 324,726
Actual Ratio (as a percent)	12.48%	12.48%
For Capital Adequacy Purposes Amount	$ 159,947	$ 156,118
For Capital Adequacy Purposes Ratio (as a percent)	6.00%	6.00%
Common equity tier 1 to risk weighted assets
Actual Amount	$ 320,987	$ 313,024
Actual Ratio (as a percent)	12.04%	12.03%
For Capital Adequacy Purposes Amount	$ 119,970	$ 11,791
For Capital Adequacy Purposes Amount (as a percent)	4.50%	4.50%
Tier 1 capital (to average assets)
Actual Amount	$ 332,690	$ 324,726
Actual Ratio (as a percent)	11.84%	12.92%
For Capital Adequacy Purposes Amount	$ 112,395	$ 100,534
For Capital Adequacy Purposes Ratio (as a percent)	4.00%	4.00%
Bank
Total capital (to risk weighted assets)
Actual Amount	$ 305,561	$ 296,207
Actual Ratio (as a percent)	11.45%	11.37%
For Capital Adequacy Purposes Amount	$ 213,492	$ 208,413
For Capital Adequacy Purposes Ratio (as a percent)	8.00%	8.00%
To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 266,866	$ 260,516
To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent)	10.00%	10.00%
Tier 1 capital (to risk weighted assets)
Actual Amount	$ 292,160	$ 283,399
Actual Ratio (as a percent)	10.94%	10.88%
For Capital Adequacy Purposes Amount	$ 160,234	$ 156,286
For Capital Adequacy Purposes Ratio (as a percent)	6.00%	6.00%
To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 213,645	$ 208,382
To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent)	8.00%	8.00%
Common equity tier 1 to risk weighted assets
Actual Amount	$ 292,160	$ 283,399
Actual Ratio (as a percent)	10.94%	10.88%
For Capital Adequacy Purposes Amount	$ 120,176	$ 117,215
For Capital Adequacy Purposes Amount (as a percent)	4.50%	4.50%
To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 173,587	$ 169,310
To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent)	6.50%	6.50%
Tier 1 capital (to average assets)
Actual Amount	$ 292,160	$ 283,399
Actual Ratio (as a percent)	10.39%	11.28%
For Capital Adequacy Purposes Amount	$ 112,477	$ 100,496
For Capital Adequacy Purposes Ratio (as a percent)	4.00%	4.00%
To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 140,597	$ 125,620
To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent)	5.00%	5.00%

Business Combinations - Narrative (Details)				3 Months Ended		12 Months Ended
Business Combinations - Narrative (Details)	Dec. 01, 2017 USD ($) shares	Aug. 08, 2017 USD ($) $ / shares	Aug. 01, 2017 USD ($) shares	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)
Business Acquisition [Line Items]
Goodwill				$ 161,685,000		$ 159,452,000
Sovereign Bancshares, Inc.
Business Acquisition [Line Items]
Number of shares issued in connection with acquisition (in shares) \| shares			5,117,642
Cash paid to acquire business			$ 56,215,000			56,215,000
Goodwill						111,301,000
Goodwill, expected to be tax deductible			0
Merger-related expenses				0	$ 0
Accounts payable and accrued expenses						6,284,000
Preferred stock - series D						24,500,000
Intangible assets			$ 9,203,000			9,203,000
Advances from Federal Home Loan Bank						80,000,000
Junior subordinated debentures						8,609,000
Liberty Bancshares, Inc.
Business Acquisition [Line Items]
Number of shares issued in connection with acquisition (in shares) \| shares	1,449,944
Cash paid to acquire business	$ 25,009,000			25,009,000
Goodwill				23,519,000
Merger-related expenses				335,000	$ 0
Accounts payable and accrued expenses				1,341,000
Intangible assets				5,814,000
Junior subordinated debentures				$ 4,625,000
Series D Preferred Stock \| Sovereign Bancshares, Inc.
Business Acquisition [Line Items]
Shares to be converted, conversion ratio			1
Preferred stock - series D		$ 24,727,000
Liquidation per share value (USD per share) \| $ / shares		$ 1,000
Preferred stock dividends			$ 185,000
Payment of preferred stock dividends						$ 227,000

Business Combinations - Acquired Assets and Assumed Liabilities (Details) - USD ($) $ in Thousands			3 Months Ended		12 Months Ended
	Dec. 01, 2017	Aug. 01, 2017	Mar. 31, 2018	Dec. 31, 2017	Dec. 31, 2017
Assets
Goodwill			$ 161,685	$ 159,452	$ 159,452
Sovereign Bancshares, Inc.
Assets
Cash and cash equivalents				44,775	44,775
Investment securities				166,307	166,307
Loans				747,828	747,828
Accrued interest receivable				3,102	3,102
Bank premises, furniture and equipment				18,279	18,279
Non-marketable equity securities				6,751	6,751
Other real estate owned				282	282
Intangible assets		$ 9,203		9,203	9,203
Goodwill				111,301	111,301
Other assets				14,337	14,337
Total Assets				1,122,165	1,122,165
Liabilities
Deposits				809,366	809,366
Accounts payable and accrued expenses				6,284	6,284
Accrued interest payable and other liabilities				806	806
Advances from Federal Home Loan Bank				80,000	80,000
Junior subordinated debentures				8,609	8,609
Total liabilities				905,065	905,065
Preferred stock - series D					24,500
Consideration
Market value of common stock issued					136,385
Cash paid		56,215			56,215
Total fair value of consideration					$ 192,600
Initial accounting incomplete, adjustment, loans				(4,622)
Initial accounting incomplete, adjustment, property, plant, and equipment				474
Initial accounting incomplete, adjustment, intangibles				749
Adjustments to goodwill				2,210
Initial accounting incomplete, adjustment, other assets				$ 1,189
Liberty Bancshares, Inc.
Assets
Cash and cash equivalents			57,384
Investment securities			54,137
Loans			312,608
Accrued interest receivable			1,191
Bank premises, furniture and equipment			6,833
Non-marketable equity securities			2,096
Other real estate owned			166
Intangible assets			5,814
Goodwill			23,519
Other assets			3,254
Total Assets			467,002
Liabilities
Deposits			395,548
Accounts payable and accrued expenses			1,341
Accrued interest payable and other liabilities			142
Junior subordinated debentures			4,625
Total liabilities			401,656
Consideration
Market value of common stock issued			40,337
Cash paid	$ 25,009		25,009
Total fair value of consideration			65,346
Initial accounting incomplete, adjustment, property, plant, and equipment			688
Initial accounting incomplete, adjustment, intangibles			(1,705)
Adjustments to goodwill			23
Initial accounting incomplete, adjustment, other assets			745
Initial accounting incomplete, adjustment, deposits			(303)
Initial accounting incomplete, adjustment, accounts payable and accrued expenses			$ 54
Scenario, Previously Reported \| Sovereign Bancshares, Inc.
Assets
Cash and cash equivalents		44,775
Investment securities		166,307
Loans		752,450
Accrued interest receivable		3,102
Bank premises, furniture and equipment		17,805
Non-marketable equity securities		6,751
Other real estate owned		282
Intangible assets		8,454
Goodwill		109,091
Other assets		13,148
Total Assets		1,122,165
Liabilities
Deposits		809,366
Accounts payable and accrued expenses		6,284
Accrued interest payable and other liabilities		806
Advances from Federal Home Loan Bank		80,000
Junior subordinated debentures		8,609
Total liabilities		905,065
Preferred stock - series D		24,500
Consideration
Market value of common stock issued		136,385
Cash paid		56,215
Total fair value of consideration		$ 192,600
Scenario, Previously Reported \| Liberty Bancshares, Inc.
Assets
Cash and cash equivalents	57,384
Investment securities	54,137
Loans	312,608
Accrued interest receivable	1,191
Bank premises, furniture and equipment	6,145
Non-marketable equity securities	2,096
Other real estate owned	166
Intangible assets	7,519
Goodwill	23,496
Other assets	2,509
Total Assets	467,251
Liabilities
Deposits	395,851
Accounts payable and accrued expenses	1,287
Accrued interest payable and other liabilities	142
Junior subordinated debentures	4,625
Total liabilities	401,905
Consideration
Market value of common stock issued	40,337
Cash paid	25,009
Total fair value of consideration	$ 65,346

Business Combinations - Loans Acquired (Details) - USD ($) $ in Thousands	Dec. 01, 2017	Aug. 01, 2017
Sovereign Bancshares, Inc.
Business Acquisition [Line Items]
Total fair value		$ 747,828
Contractual principal balance		775,056
Liberty Bancshares, Inc.
Business Acquisition [Line Items]
Total fair value	$ 312,608
Contractual principal balance	317,867
PCI loans \| Sovereign Bancshares, Inc.
Business Acquisition [Line Items]
Total fair value		47,585
Contractual principal balance		67,985
Contractually required principal and interest		85,125
Non-accretable difference		33,064
Cash flows expected to be collected		52,061
Accretable difference		4,476
PCI loans \| Liberty Bancshares, Inc.
Business Acquisition [Line Items]
Total fair value	1,175
Contractual principal balance	1,748
Contractually required principal and interest	2,316
Non-accretable difference	711
Cash flows expected to be collected	1,605
Accretable difference	430
Real Estate \| Sovereign Bancshares, Inc.
Business Acquisition [Line Items]
Total fair value		535,969
Real Estate \| Liberty Bancshares, Inc.
Business Acquisition [Line Items]
Total fair value	257,894
Real Estate \| PCI loans \| Sovereign Bancshares, Inc.
Business Acquisition [Line Items]
Total fair value		17,708
Real Estate \| PCI loans \| Liberty Bancshares, Inc.
Business Acquisition [Line Items]
Total fair value	868
Commercial \| Sovereign Bancshares, Inc.
Business Acquisition [Line Items]
Total fair value		210,607
Commercial \| Liberty Bancshares, Inc.
Business Acquisition [Line Items]
Total fair value	49,967
Commercial \| PCI loans \| Sovereign Bancshares, Inc.
Business Acquisition [Line Items]
Total fair value		29,877
Commercial \| PCI loans \| Liberty Bancshares, Inc.
Business Acquisition [Line Items]
Total fair value	307
Consumer \| Sovereign Bancshares, Inc.
Business Acquisition [Line Items]
Total fair value		1,252
Consumer \| Liberty Bancshares, Inc.
Business Acquisition [Line Items]
Total fair value	4,747
Consumer \| PCI loans \| Sovereign Bancshares, Inc.
Business Acquisition [Line Items]
Total fair value		0
Consumer \| PCI loans \| Liberty Bancshares, Inc.
Business Acquisition [Line Items]
Total fair value	0
Other Acquired Loans \| Sovereign Bancshares, Inc.
Business Acquisition [Line Items]
Total fair value		700,243
Contractual principal balance		707,071
Other Acquired Loans \| Liberty Bancshares, Inc.
Business Acquisition [Line Items]
Total fair value	311,433
Contractual principal balance	316,119
Other Acquired Loans \| Real Estate \| Sovereign Bancshares, Inc.
Business Acquisition [Line Items]
Total fair value		518,261
Other Acquired Loans \| Real Estate \| Liberty Bancshares, Inc.
Business Acquisition [Line Items]
Total fair value	257,026
Other Acquired Loans \| Commercial \| Sovereign Bancshares, Inc.
Business Acquisition [Line Items]
Total fair value		180,730
Other Acquired Loans \| Commercial \| Liberty Bancshares, Inc.
Business Acquisition [Line Items]
Total fair value	49,660
Other Acquired Loans \| Consumer \| Sovereign Bancshares, Inc.
Business Acquisition [Line Items]
Total fair value		$ 1,252
Other Acquired Loans \| Consumer \| Liberty Bancshares, Inc.
Business Acquisition [Line Items]
Total fair value	$ 4,747

Business Combinations - Summary of Intangible Assets Acquired (Details) - USD ($) $ in Thousands	Dec. 01, 2017	Aug. 01, 2017	Mar. 31, 2018	Dec. 31, 2017
Sovereign Bancshares, Inc.
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets		$ 9,203		$ 9,203
Sovereign Bancshares, Inc. \| Core deposit intangibles
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets		$ 8,452
Acquired intangible assets, weighted average useful life		7 years 8 months 12 days
Sovereign Bancshares, Inc. \| Servicing asset
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets		$ 317
Acquired intangible assets, weighted average useful life		6 years 1 month 6 days
Sovereign Bancshares, Inc. \| Intangible lease assets
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets		$ 434
Acquired intangible assets, weighted average useful life		5 years
Liberty Bancshares, Inc.
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets			$ 5,814
Liberty Bancshares, Inc. \| Core deposit intangibles
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets	$ 5,814
Acquired intangible assets, weighted average useful life	10 years

Intangbile Assets and Goodwill - Summary Of Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Asset	$ 23,045	$ 23,909
Accumulated Amortization	4,673	3,468
Net Intangible Asset	$ 18,372	$ 20,441
Core deposit intangibles
Finite-Lived Intangible Assets [Line Items]
Weighted Amortization Period	8 years 6 months 18 days	8 years 8 months 12 days
Gross Intangible Asset	$ 16,051	$ 17,007
Accumulated Amortization	3,081	2,694
Net Intangible Asset	$ 12,970	$ 14,313
Servicing asset
Finite-Lived Intangible Assets [Line Items]
Weighted Amortization Period	5 years 6 months 26 days	6 years 9 months 18 days
Gross Intangible Asset	$ 1,713	$ 1,621
Accumulated Amortization	508	406
Net Intangible Asset	$ 1,205	$ 1,215
Intangible lease assets
Finite-Lived Intangible Assets [Line Items]
Weighted Amortization Period	3 years 1 month 21 days	3 years 3 months 18 days
Gross Intangible Asset	$ 5,281	$ 5,281
Accumulated Amortization	1,084	368
Net Intangible Asset	$ 4,197	$ 4,913

Intangible Assets and Goodwill - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 978	$ 95
Amortization Of Intangible Assets Occupancy And Equipment And Other Income
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 1,205	$ 157

Intangible Assets and Goodwill Intangible Assets and Goodwill - Goodwill Rollforward (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Goodwill [Line Items]
Beginning of period	$ 159,452
End of period	161,685	$ 159,452
Sovereign Bancshares, Inc.
Goodwill [Line Items]
Beginning of period	111,301
Effect of acquisitions		2,210
End of period		$ 111,301
Liberty Bancshares, Inc.
Goodwill [Line Items]
Effect of acquisitions	23
End of period	$ 23,519

Branch Assets and Liabilities Held For Sale (Details) - USD ($) $ in Thousands		3 Months Ended
	Jan. 01, 2018	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash settlement for sale of branches		$ 33,557	$ 0
Deposits		2,493,794		$ 2,278,630
Total assets		1,753		33,552
Total liabilities		0		64,627
Disposal Group, Disposed of by Sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash settlement for sale of branches		33,557
Deposits		1,000
Gain on sale	$ 355
Disposal Group, Held-for-sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash and cash equivalents		0		334
Loans		0		26,313
Accrued interest receivable		0		63
Bank premises, furniture and equipment		1,753		5,118
Intangible assets		0		1,724
Total assets		1,753		33,552
Deposits		0		64,282
Accounts payable and accrued expenses		0		2
Deferred tax liability		0		327
Accrued interest payable and other liabilities		0		16
Total liabilities		$ 0		$ 64,627

Loans and Allowance for Loan Losses - Past Due (Details) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Age analysis of past due loans, excluding purchased credit impaired loans, aggregated by class of loans
Total Past Due	$ 5,280,000	$ 6,402,000
Total Current	2,310,809,000	2,227,116,000
Total Loans	2,316,089,000	2,233,518,000
Total 90 Days Past Due and Still Accruing	374,000	18,000
30 to 59 Days
Age analysis of past due loans, excluding purchased credit impaired loans, aggregated by class of loans
Total Past Due	1,926,000	5,416,000
60 to 89 Days
Age analysis of past due loans, excluding purchased credit impaired loans, aggregated by class of loans
Total Past Due	134,000	579,000
90 Days or Greater
Age analysis of past due loans, excluding purchased credit impaired loans, aggregated by class of loans
Total Past Due	3,220,000	407,000
Commercial
Age analysis of past due loans, excluding purchased credit impaired loans, aggregated by class of loans
Total Past Due	1,482,000	2,627,000
Total Current	671,338,000	681,924,000
Total Loans	672,820,000	684,551,000
Total 90 Days Past Due and Still Accruing	374,000	0
Commercial \| 30 to 59 Days
Age analysis of past due loans, excluding purchased credit impaired loans, aggregated by class of loans
Total Past Due	982,000	1,849,000
Commercial \| 60 to 89 Days
Age analysis of past due loans, excluding purchased credit impaired loans, aggregated by class of loans
Total Past Due	49,000	389,000
Commercial \| 90 Days or Greater
Age analysis of past due loans, excluding purchased credit impaired loans, aggregated by class of loans
Total Past Due	451,000	389,000
Consumer
Age analysis of past due loans, excluding purchased credit impaired loans, aggregated by class of loans
Total Past Due	95,000	108,000
Total Current	7,956,000	9,540,000
Total Loans	8,051,000	9,648,000
Total 90 Days Past Due and Still Accruing	0	18,000
Consumer \| 30 to 59 Days
Age analysis of past due loans, excluding purchased credit impaired loans, aggregated by class of loans
Total Past Due	47,000	39,000
Consumer \| 60 to 89 Days
Age analysis of past due loans, excluding purchased credit impaired loans, aggregated by class of loans
Total Past Due	48,000	51,000
Consumer \| 90 Days or Greater
Age analysis of past due loans, excluding purchased credit impaired loans, aggregated by class of loans
Total Past Due	0	18,000
Construction and land \| Real Estate
Age analysis of past due loans, excluding purchased credit impaired loans, aggregated by class of loans
Total Past Due	2,769,000	320,000
Total Current	298,254,000	277,505,000
Total Loans	301,023,000	277,825,000
Total 90 Days Past Due and Still Accruing	0	0
Construction and land \| Real Estate \| 30 to 59 Days
Age analysis of past due loans, excluding purchased credit impaired loans, aggregated by class of loans
Total Past Due	0	320,000
Construction and land \| Real Estate \| 60 to 89 Days
Age analysis of past due loans, excluding purchased credit impaired loans, aggregated by class of loans
Total Past Due	0	0
Construction and land \| Real Estate \| 90 Days or Greater
Age analysis of past due loans, excluding purchased credit impaired loans, aggregated by class of loans
Total Past Due	2,769,000	0
Farmland \| Real Estate
Age analysis of past due loans, excluding purchased credit impaired loans, aggregated by class of loans
Total Past Due	0	104,000
Total Current	9,366,000	9,281,000
Total Loans	9,366,000	9,385,000
Total 90 Days Past Due and Still Accruing	0	0
Farmland \| Real Estate \| 30 to 59 Days
Age analysis of past due loans, excluding purchased credit impaired loans, aggregated by class of loans
Total Past Due	0	104,000
Farmland \| Real Estate \| 60 to 89 Days
Age analysis of past due loans, excluding purchased credit impaired loans, aggregated by class of loans
Total Past Due	0	0
Farmland \| Real Estate \| 90 Days or Greater
Age analysis of past due loans, excluding purchased credit impaired loans, aggregated by class of loans
Total Past Due	0	0
Real estate \| Real Estate
Age analysis of past due loans, excluding purchased credit impaired loans, aggregated by class of loans
Total Loans	369,288,000	342,817,000
Commercial Real Estate \| Real Estate
Age analysis of past due loans, excluding purchased credit impaired loans, aggregated by class of loans
Total Past Due	874,000	1,830,000
Total Current	954,667,000	907,462,000
Total Loans	955,541,000	909,292,000
Total 90 Days Past Due and Still Accruing	0	0
Commercial Real Estate \| Real Estate \| 30 to 59 Days
Age analysis of past due loans, excluding purchased credit impaired loans, aggregated by class of loans
Total Past Due	874,000	1,830,000
Commercial Real Estate \| Real Estate \| 60 to 89 Days
Age analysis of past due loans, excluding purchased credit impaired loans, aggregated by class of loans
Total Past Due	0	0
Commercial Real Estate \| Real Estate \| 90 Days or Greater
Age analysis of past due loans, excluding purchased credit impaired loans, aggregated by class of loans
Total Past Due	0	0
1 - 4 family residential \| Real estate \| Real Estate
Age analysis of past due loans, excluding purchased credit impaired loans, aggregated by class of loans
Total Past Due	60,000	1,413,000
Total Current	246,746,000	235,129,000
Total Loans	246,806,000	236,542,000
Total 90 Days Past Due and Still Accruing	0	0
1 - 4 family residential \| Real estate \| Real Estate \| 30 to 59 Days
Age analysis of past due loans, excluding purchased credit impaired loans, aggregated by class of loans
Total Past Due	23,000	1,274,000
1 - 4 family residential \| Real estate \| Real Estate \| 60 to 89 Days
Age analysis of past due loans, excluding purchased credit impaired loans, aggregated by class of loans
Total Past Due	37,000	139,000
1 - 4 family residential \| Real estate \| Real Estate \| 90 Days or Greater
Age analysis of past due loans, excluding purchased credit impaired loans, aggregated by class of loans
Total Past Due	0	0
Multi-family residential \| Real estate \| Real Estate
Age analysis of past due loans, excluding purchased credit impaired loans, aggregated by class of loans
Total Past Due	0	0
Total Current	122,482,000	106,275,000
Total Loans	122,482,000	106,275,000
Total 90 Days Past Due and Still Accruing	0	0
Multi-family residential \| Real estate \| Real Estate \| 30 to 59 Days
Age analysis of past due loans, excluding purchased credit impaired loans, aggregated by class of loans
Total Past Due	0	0
Multi-family residential \| Real estate \| Real Estate \| 60 to 89 Days
Age analysis of past due loans, excluding purchased credit impaired loans, aggregated by class of loans
Total Past Due	0	0
Multi-family residential \| Real estate \| Real Estate \| 90 Days or Greater
Age analysis of past due loans, excluding purchased credit impaired loans, aggregated by class of loans
Total Past Due	0	0
PCI loans
Age analysis of past due loans, excluding purchased credit impaired loans, aggregated by class of loans
Total Loans	54,690,000	63,940,000
PCI loans \| 90 Days or Greater
Age analysis of past due loans, excluding purchased credit impaired loans, aggregated by class of loans
Total 90 Days Past Due and Still Accruing	2,000,000	3,300
Nonperforming financial instruments
Age analysis of past due loans, excluding purchased credit impaired loans, aggregated by class of loans
Total Loans	$ 0	0
Scenario, Adjustment \| 1 - 4 family residential \| Real estate \| Real Estate
Age analysis of past due loans, excluding purchased credit impaired loans, aggregated by class of loans
Total Current		(15,123,000)
Scenario, Adjustment \| Multi-family residential \| Real estate \| Real Estate
Age analysis of past due loans, excluding purchased credit impaired loans, aggregated by class of loans
Total Current		$ 15,123,000