LegacyTexas Financial 10-K 9 Feb 17 2016 FY Annual report Financial data

DOCUMENT AND ENTITY INFORMATION

DOCUMENT AND ENTITY INFORMATION - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Feb. 07, 2017	Jun. 30, 2016
Document and Entity Information [Abstract]
Entity Registrant Name	LegacyTexas Financial Group, Inc.
Entity Central Index Key	1,487,052
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Document Period End Date	Dec. 31, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding		47,886,498
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 1,245.8

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
ASSETS
Cash and due from financial institutions	$ 59,823	$ 53,847
Short-term interest-bearing deposits in other financial institutions	229,389	561,792
Total cash and cash equivalents	289,212	615,639
Securities available for sale, at fair value	354,515	311,708
Securities held to maturity (fair value: December 31, 2016 — $212,981, December 31, 2015— $247,202)	210,387	240,433
Loans held for sale, at fair value	21,279	22,535
Loans held for investment (net of allowance for loan losses of $64,576 at December 31, 2016 and $47,093 at December 31, 2015)	5,998,596	5,017,554
Loans held for investment - Warehouse Purchase Program	1,055,341	1,043,719
Total loans held for investment	7,053,937	6,061,273
Federal Home Loan Bank (FHLB) stock and other restricted securities, at cost	43,266	63,075
Bank-owned life insurance	56,477	55,231
Premises and equipment, net	74,226	77,637
Goodwill	178,559	180,776
Other assets	80,397	63,633
Total assets	8,362,255	7,691,940
Deposits
Non-interest-bearing demand	1,383,951	1,170,272
Interest-bearing demand	903,314	819,350
Savings and money market	2,710,307	2,209,698
Time	1,367,904	1,027,391
Total deposits	6,365,476	5,226,711
FHLB advances	833,682	1,439,904
Repurchase agreements	86,691	83,269
Subordinated debt	134,032	84,992
Accrued expenses and other liabilities	57,009	52,988
Total liabilities	7,476,890	6,887,864
Commitments and contingent liabilities (See Note 17)
Shareholders’ equity
Preferred stock, $.01 par value; 10,000,000 shares authorized; 0 shares issued — December 31, 2016 and December 31, 2015	0	0
Common stock, $.01 par value; 90,000,000 shares authorized; shares issued 47,876,198 — December 31, 2016 and 47,645,826 shares issued — December 31, 2015	479	476
Additional paid-in capital	589,408	576,753
Retained earnings	310,641	240,496
Accumulated other comprehensive income (loss), net	(2,713)	(133)
Unearned Employee Stock Ownership Plan (ESOP) shares; 1,245,046 shares at December 31, 2016 and 1,365,457 shares at December 31, 2015	(12,450)	(13,516)
Total shareholders’ equity	885,365	804,076
Total liabilities and shareholders’ equity	$ 8,362,255	$ 7,691,940

CONSOLIDATED BALANCE SHEETS (PA

CONSOLIDATED BALANCE SHEETS (PARENTHETICAL) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Fair value of securities held to maturity	$ 212,981	$ 247,202
Allowance for loan losses on loans held for investment	$ 64,576	$ 47,093
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Preferred stock, shares issued (in shares)	0	0
Common Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common Stock, shares authorized (in shares)	90,000,000	90,000,000
Common Stock, shares issued (in shares)	47,876,198	47,645,826
Unearned Employee Stock Ownership Plan (ESOP) shares (in shares)	1,245,046	1,365,457

CONSOLIDATED STATEMENTS OF INCO

CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Interest and dividend income
Loans, including fees	$ 301,542	$ 248,665	$ 137,255
Taxable securities	9,254	9,307	9,352
Nontaxable securities	3,052	2,995	2,248
Interest-bearing deposits in other financial institutions	1,878	631	249
FHLB and FRB stock and other	1,626	1,094	543
Total interest and dividend income	317,352	262,692	149,647
Interest expense
Deposits	21,034	13,127	8,212
FHLB advances	7,167	6,552	7,610
Interest Expense, Other	6,882	1,936	818
Total interest expense	35,083	21,615	16,640
Net interest income	282,269	241,077	133,007
Provision for credit losses	26,900	25,465	6,721
Net interest income after provision for credit losses	255,369	215,612	126,286
Non-interest income
Service charges and other fees	36,690	30,936	19,382
Net gain on sale of mortgage loans held for sale	8,225	8,036	0
Bank-owned life insurance income	1,744	1,699	628
Net gain on securities transactions	56	203	0
Gain on sale and disposition of assets	3,356	873	658
Other	1,860	3,068	75
Total non-interest income	51,931	44,815	20,743
Non-interest expense
Salaries and employee benefits	92,568	92,527	55,057
Merger and acquisition costs	0	1,553	10,291
Advertising	3,861	3,773	1,535
Occupancy and equipment	15,007	14,860	7,374
Outside professional services	3,872	3,332	2,291
Regulatory assessments	4,948	4,260	2,713
Data processing	14,974	11,278	6,862
Office operations	9,901	10,697	6,584
Other	11,246	9,275	5,385
Total non-interest expense	156,377	151,555	98,092
Income before income tax expense	150,923	108,872	48,937
Income tax expense	53,102	37,956	17,659
Net income	$ 97,821	$ 70,916	$ 31,278
Earnings per share:
Basic (in dollars per share)	$ 2.11	$ 1.54	$ 0.82
Diluted (in dollars per share)	2.09	1.53	0.81
Dividends declared per share (in dollars per share)	$ 0.58	$ 0.54	$ 0.48

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 97,821	$ 70,916	$ 31,278
Change in unrealized gains (losses) on securities available for sale	(3,917)	(1,434)	2,022
Reclassification of amount realized through sale of securities	(56)	(203)	0
Tax effect	1,393	574	(709)
Other comprehensive income (loss), net of tax	(2,580)	(1,063)	1,313
Comprehensive income	$ 95,241	$ 69,853	$ 32,591

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss), Net [Member]	Unearned ESOP Shares [Member]
Balance at Dec. 31, 2013	$ 544,460	$ 399	$ 377,657	$ 183,236	$ (383)	$ (16,449)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	31,278			31,278
Other comprehensive income (loss), net of tax	1,313				1,313
Dividends declared	(19,187)			(19,187)
ESOP shares earned	5,557		4,091			1,466
Share-based compensation expense	3,717		3,717
Net issuance of common stock under employee stock plans	1,085	1	1,084
Balance at Dec. 31, 2014	568,223	400	386,549	195,327	930	(14,983)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	70,916			70,916
Other comprehensive income (loss), net of tax	(1,063)				(1,063)
Dividends declared	(25,747)			(25,747)
ESOP shares earned	5,751		4,284			1,467
Share-based compensation expense	5,477		5,477
Net issuance of common stock under employee stock plans	1,284	1	1,283
Share repurchase	(7,989)	(4)	(7,985)
Acquisition of LegacyTexas Group, Inc.	187,224	79	187,145
Balance at Dec. 31, 2015	804,076	476	576,753	240,496	(133)	(13,516)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	97,821			97,821
Other comprehensive income (loss), net of tax	(2,580)				(2,580)
Dividends declared	(27,676)			(27,676)
ESOP shares earned	3,955		2,889			1,066
Share-based compensation expense	6,014		6,014
Net issuance of common stock under employee stock plans	3,755	3	3,752
Balance at Dec. 31, 2016	$ 885,365	$ 479	$ 589,408	$ 310,641	$ (2,713)	$ (12,450)

CONSOLIDATED STATEMENTS OF CHA7

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (PARENTHETICAL) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Stockholders' Equity [Abstract]
Dividends declared (in dollars per share)	$ 0.58	$ 0.54	$ 0.48
ESOP shares (in shares)	120,411	184,194	184,194
Net issuance of common stock under employee stock plans (in shares)	230,372	138,855	76,035
Number of shares repurchased (in shares)		357,950
Stock issued for acquisition (in shares)		7,850,070

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash flows from operating activities
Net income	$ 97,821	$ 70,916	$ 31,278
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	26,900	25,465	6,721
Depreciation and amortization	7,081	7,196	4,393
Deferred tax expense (benefit)	(6,798)	(692)	(1,414)
Premium amortization and accretion of securities, net	4,359	4,267	3,416
Accretion related to acquired loans	(4,613)	(10,241)	(1,500)
Net (gain) on securities transactions	(56)	(203)	0
ESOP compensation expense	3,955	5,751	5,557
Share-based compensation expense	6,014	5,477	3,717
Net gain on loans held for sale	(8,225)	(8,036)	0
Loans originated or purchased for sale	(218,288)	(222,195)	0
Proceeds from sale of loans held for sale	227,769	225,335	0
FHLB stock dividends	(539)	(152)	(103)
Bank-owned life insurance income	(1,744)	(1,699)	(628)
(Gain) loss on sale and disposition of repossessed assets, premises and equipment	(3,524)	(293)	1,824
Disposition of insurance subsidiary goodwill upon sale of subsidiary operations	2,217	0	0
Net change in deferred loan fees (costs)	391	(1,067)	1,660
Net change in accrued interest receivable	(3,238)	(2,821)	(443)
Net change in other assets	(2,947)	8,444	117
Net change in other liabilities	5,913	(16,250)	(2,571)
Net cash provided by operating activities	132,448	89,202	52,024
Available for sale securities:
Maturities, prepayments and calls	2,276,913	2,114,641	2,050,002
Purchases	(2,334,558)	(2,148,080)	(2,001,501)
Proceeds from sale of AFS securities	7,700	36,984	0
Held to maturity securities:
Maturities, prepayments and calls	41,384	49,730	57,000
Purchases	(12,477)	(15,933)	(5,919)
Originations of Warehouse Purchase Program loans	(19,966,527)	(15,511,029)	(11,913,793)
Proceeds from pay-offs of Warehouse Purchase Program loans	19,954,905	15,253,726	11,800,847
Net change in loans held for investment, excluding Warehouse Purchase Program	(1,014,500)	(1,030,016)	(583,762)
Redemption (purchase) of FHLB and FRB stock and other	20,348	(14,527)	(9,098)
Cash received in excess of cash paid for acquisition of LegacyTexas Group, Inc.	0	128,598	0
Purchases of premises and equipment	(8,420)	(5,660)	(1,253)
Proceeds from sale of assets	15,803	10,121	621
Net cash (used in) investing activities	(1,019,429)	(1,131,445)	(606,856)
Cash flows from financing activities
Net change in deposits	1,138,765	940,862	393,170
Proceeds from FHLB advances	200,000	1,350,000	712,000
Repayments on FHLB advances	(806,222)	(773,003)	(488,189)
Share repurchase	0	(7,989)	0
Proceeds from borrowings	76,861	73,407	0
Repayments of borrowings	(24,929)	(32,953)	0
Payment of dividends	(27,676)	(25,747)	(19,187)
Activity in employee stock plans	3,755	1,284	1,085
Net cash provided by financing activities	560,554	1,525,861	598,879
Net change in cash and cash equivalents	(326,427)	483,618	44,047
Beginning cash and cash equivalents	615,639	132,021	87,974
Ending cash and cash equivalents	289,212	615,639	132,021
Supplemental cash flow information:
Interest paid	34,625	20,861	16,807
Income taxes paid	60,854	36,835	15,941
Supplemental noncash disclosures:
Transfers from loans to other real estate owned	10,780	3,287	954
Common stock issued in consideration of LegacyTexas Group, Inc. acquisition	$ 0	$ 187,224	$ 0

SUMMARY OF SIGNIFICANT ACCOUNTI

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	12 Months Ended
	Dec. 31, 2016
Accounting Policies [Abstract]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	Summary of Significant Accounting Policies Nature of Operations and Principles of Consolidation : The consolidated financial statements include LegacyTexas Financial Group, Inc. (the "Company"), whose business at December 31, 2016 primarily consisted of the operations of its wholly-owned subsidiary, LegacyTexas Bank (the "Bank"). In addition, the Company also offers title services through LegacyTexas Title Co., which is a wholly-owned subsidiary of the Bank. Intercompany transactions and balances are eliminated in consolidation. At December 31, 2016 , the Company provided financial services through 45 banking offices in the Dallas/Fort Worth Metroplex and surrounding counties. Its primary deposit products are demand, savings and certificate of deposit accounts, and its primary lending products are commercial real estate, commercial and industrial and consumer lending, including one- to four- family real estate loans. Most loans are secured by specific items of collateral, including business assets, commercial and residential real estate and consumer assets. Commercial loans are expected to be repaid from cash flow from operations of businesses. Use of Estimates : To prepare financial statements in conformity with U.S. generally accepted accounting principles ("US GAAP"), management makes estimates and assumptions based on available information. These estimates and assumptions affect the amounts reported in the financial statements and the disclosures provided, and actual results could differ. The allowance for loan losses, valuation of other real estate owned, other-than-temporary impairment of securities, realization of deferred tax assets, and fair values of financial instruments are subject to change. Cash Flows : Cash and cash equivalents include cash, deposits with other financial institutions with maturities less than 90 days, and federal funds sold. Net cash flows are reported for customer loan and deposit transactions, interest-bearing deposits in other financial institutions, federal funds purchased, Federal Home Loan Bank advances and repurchase agreements. Restrictions on Cash : The Company maintains deposits with other financial institutions in amounts that exceed federal deposit insurance coverage. Management regularly evaluates the credit risk associated with the counterparties to these transactions and believes that the Company is not exposed to any significant credit risks on cash and cash equivalents. Cash balances equaling or exceeding escrow amounts are maintained at correspondent banks. Securities : Securities that the Company has both the positive intent and ability to hold to maturity are classified as held to maturity and are carried at amortized cost. Securities that the Company intends to hold for an indefinite period of time, but not necessarily to maturity, are classified as available for sale and are carried at fair value. Unrealized gains and losses on securities classified as available for sale have been accounted for as accumulated other comprehensive income (loss), net of taxes. Gains and losses on the sale of securities classified as available for sale are recorded on the trade date using the specific-identification method. Amortization of premiums and discounts are recognized in interest income over the period to maturity. Premiums and discounts on securities are amortized using the level-yield method without anticipating prepayment, except for mortgage-backed securities where prepayments are anticipated. The Company evaluates securities for other-than-temporary impairment on at least a quarterly basis and more frequently when economic, market, or security specific concerns warrant such evaluation. Consideration is given to the length of time and the extent to which the fair value has been less than amortized cost, the financial condition and near-term prospects of the issuer, and the intent and ability of the Company to retain its investment for a period of time sufficient to allow for any anticipated recovery in fair value. In analyzing an issuer’s financial condition, the Company may consider whether the securities are issued by the federal government or its agencies, whether downgrades by bond rating agencies have occurred, and the results of reviews of the issuers’ financial condition. The Company conducts regular reviews of the bond agency ratings of securities and considers whether the securities were issued by or have principal and interest payments guaranteed by the federal government or its agencies. These reviews focus on the underlying rating of the issuer and also include the insurance rating of securities that have an insurance component or guarantee. The ratings and financial condition of the issuers are monitored, as well as the financial condition and ratings of the insurers and guarantors. For periods in which other-than-temporary impairment of a debt security is recognized, the credit portion of the amount is determined by subtracting the present value of the stream of estimated cash flows as calculated in a discounted cash flow model and discounted at book yield from the prior period’s ending carrying value. The non-credit portion of the amount is determined by subtracting the credit portion of the impairment from the difference between the book value and fair value of the security. The credit related portion of the impairment is charged against income and the non-credit related portion is charged to equity as a component of accumulated other comprehensive income. The Company did not recognize any other-than-temporary impairment on its securities portfolio for the years ended December 31, 2016 and 2015 . Mortgage Loans Held for Sale : The Company elects the fair value option for recording residential mortgage loans held for sale in accordance with Accounting Standards Codification ("ASC") 825, "Financial Instruments". This election allows for a more effective offset of the changes in fair values of the loans and the derivative instruments used to economically hedge them without the burden of complying with the requirements for hedge accounting under ASC 815, “Derivatives and Hedging.” Warehouse Purchase Program Loans : The Warehouse Purchase Program allows unaffiliated mortgage originators to close one-to-four family real estate loans in their own name and manage its cash flow needs until the loans are sold to investors. The mortgage banking company customer closes mortgage loans consistent with underwriting standards established by the Bank and approved investors and, once all pertinent documents are received, the participation interest is delivered by the Bank to the investor selected by the originator and approved by us. Although not bound by any legally binding commitment, when a purchase decision is made, we purchase a 100% participation interest in the mortgage loans originated by our mortgage banking company customers. All Warehouse Purchase Program loans are collectively evaluated for impairment and are purchased under several contractual requirements, providing safeguards to the Company. These safeguards include the requirement that our mortgage company customers have a takeout commitment or similar arrangement for each loan. To date, the Company has not experienced a loss on these loans and no allowance for loan losses has been allocated to them. Loans : Loans that management has the intent and ability to hold for the foreseeable future or until maturity or payoff are reported at the principal balance outstanding, net of unearned interest, purchase premiums and discounts, deferred loan fees and costs, and an allowance for loan losses. Interest income is accrued on the unpaid principal balance. Loan origination fees, net of certain direct origination costs, are deferred and recognized in interest income using the level-yield method without anticipating prepayments. Past due status is based on the contractual terms of the loan. Loans that are past due 30 days are considered delinquent. Interest income on loans is discontinued at the time the loan is 90 days delinquent unless the loan is well-secured and in process of collection. Non-mortgage consumer loans are typically charged off no later than 120 days past due. In all cases, loans are placed on nonaccrual or charged-off at an earlier date if collection of principal or interest is considered doubtful. Nonaccrual loans include both smaller balance homogeneous loans that are collectively evaluated for impairment and larger individually classified impaired loans. All interest accrued but not received for loans placed on nonaccrual status is reversed against interest income. Subsequent receipts on non-accrual loans are recorded as a reduction of principal, and interest income is recorded only after principal recovery is reasonably assured. Loans are returned to accrual status when all the principal and interest amounts contractually due are brought current and future payments are reasonably assured. For loans collateralized by real property and commercial and industrial loans, credit exposure is monitored by internally assigned grades used for classification of loans. A loan is considered “special mention” when management has determined that there is a potential weakness that deserves management's close attention. Loans rated as "special mention" are not adversely classified according to regulatory classifications and do not expose the Company to sufficient risk to warrant adverse classification. A loan is considered “substandard” if it is inadequately protected by the current net worth and paying capacity of the obligor or the collateral pledged, if any. “Substandard” loans include those characterized by the “distinct possibility” that the insured institution will sustain “some loss” if the deficiencies are not corrected, and the loan may or may not meet the criteria for impairment. Loans classified as “doubtful” have all of the weaknesses of those classified as “substandard”, with the added characteristic that the weaknesses present make “collection or liquidation in full,” on the basis of currently existing facts, conditions and values, “highly questionable and improbable.” All other loans that do not fall into the above mentioned categories are considered “pass” loans. Updates to internally assigned grades are made monthly and/or upon significant developments. For other consumer loans (non-real estate), credit exposure is monitored by payment history of the loans. Non-performing other consumer loans are on nonaccrual status and are generally greater than 90 days past due. Acquired Loans : Loans acquired through the completion of a transfer, including loans acquired in a business combination, that have evidence of deterioration of credit quality since origination and for which it is probable, at acquisition, that the Company will be unable to collect all contractually required payment receivable are initially recorded at fair value (as determined by the present value of expected future cash flows) with no valuation allowance. The difference between the undiscounted cash flows expected at acquisition and the investment in the loan, or the “accretable yield,” is recognized as interest income on a level-yield method over the life of the loan. Contractually required payments for interest and principal that exceed the undiscounted cash flows expected at acquisition, or the “nonaccretable difference,” are not recognized on the balance sheet and do not result in any yield adjustments, loss accruals or valuation allowances. Increases in expected cash flows, including prepayments, subsequent to the initial investment are recognized prospectively through adjustment of the yield on the loan over its remaining life. Decreases in expected cash flows are recognized as impairment. Valuation allowances on these impaired loans reflect only losses incurred after the acquisition (meaning the present value of all cash flows expected at acquisition that ultimately are not to be received). Revolving loans, including lines of credit, are excluded from acquired credit impaired loan accounting. For acquired loans not deemed credit-impaired at acquisition, the differences between the initial fair value and the unpaid principal balance are recognized as interest income on a level-yield basis over the lives of the related loans. Subsequent to the acquisition date, methods utilized to estimate the required allowance for loan losses for these loans is similar to originated loans; however, a provision for credit losses will be recorded only to the extent the required allowance exceeds any remaining credit discounts. Concentration of Credit Risk : Most of the Company’s business activity is with customers located within the North Texas region and a large portion of loans are secured by real estate in this area. Therefore, the Company’s exposure to credit risk is significantly affected by changes in the economy of the North Texas area. Allowance for Loan Losses : The allowance for loan losses and related provision expense are susceptible to change if the credit quality of our loan portfolio changes, which is evidenced by many factors, including but not limited to charge-offs and non-performing loan trends. Generally, consumer real estate lending has a lower credit risk profile compared to other consumer lending (such as automobile loans). Commercial real estate and commercial and industrial lending, however, can have higher risk profiles than consumer loans due to these loans being larger in amount and non-homogeneous in structure and term. Changes in economic conditions, the mix and size of the loan portfolio, and individual borrower conditions can dramatically impact our level of allowance for loan losses in relatively short periods of time. The allowance for loan losses is maintained to cover incurred losses that are estimated in accordance with US GAAP. It is our estimate of credit losses inherent in our loan portfolio at each balance sheet date. Our methodology for analyzing the allowance for loan losses consists of general and specific components. For the general component, we stratify the loan portfolio into homogeneous groups of loans that possess similar loss potential characteristics and apply a loss ratio to these groups of loans to estimate the credit losses in the loan portfolio. We use both historical loss ratios and qualitative loss factors assigned to major loan collateral types to establish general component loss allocations, inclusive of estimated loss emergence periods. Qualitative loss factors are based on management's judgment of company, market, industry or business specific data and external economic indicators, which are not yet reflected in the historical loss ratios, and that could impact the Company's specific loan portfolios. The Allowance for Loan Loss Committee sets and adjusts qualitative loss factors by regularly reviewing changes in underlying loan composition and the seasonality of specific portfolios. The Allowance for Loan Loss Committee also considers credit quality and trends relating to delinquency, non-performing and adversely rated loans within the Company's loan portfolio when evaluating qualitative loss factors. Additionally, the Allowance for Loan Loss Committee adjusts qualitative factors to account for the potential impact of external economic factors, including the unemployment rate, vacancy and capitalization rates and other pertinent economic data specific to our primary market area and lending portfolios. For the specific component, the allowance for loan losses includes loans where management has concerns about the borrower's ability to repay and on individually analyzed loans found to be impaired. Management evaluates current information and events regarding a borrower's ability to repay its obligations and considers a loan to be impaired when the ultimate collectability of amounts due, according to the contractual terms of the loan agreement, is in doubt. If an impaired loan is collateral-dependent, the fair value of the collateral, less the estimated cost to sell, is used to determine the amount of impairment. If an impaired loan is not collateral-dependent, the impairment amount is determined using the negative difference, if any, between the estimated discounted cash flows and the loan amount due. For impaired loans, the amount of the impairment can be adjusted, based on current data, until such time as the actual basis is established by acquisition of the collateral or until the basis is collected. Impairment losses are reflected in the allowance for loan losses through a charge to the provision for credit losses. Subsequent recoveries are credited to the allowance for loan losses. Cash receipts for accruing loans are applied to principal and interest under the contractual terms of the loan agreement. Cash receipts on impaired loans for which the accrual of interest has been discontinued are applied first to principal. Large groups of smaller-balance homogeneous loans are collectively evaluated for impairment. As a result, the Company does not separately identify consumer real estate loans less than $417 or individual consumer non-real estate secured loans for impairment disclosures. The Company considers these loans to be homogeneous in nature due to the smaller dollar amount and the similar underwriting criteria. A loan that has been modified is considered a troubled debt restructuring (“TDR”) when two conditions are met: 1) the borrower is experiencing financial difficulty and 2) concessions are made for the borrower's benefit that would not otherwise be considered for a borrower or transaction with similar credit risk characteristics. Modifications to loan terms may include a modification of the contractual interest rate to a below-market rate (even if the modified rate is higher than the original rate), forgiveness of accrued interest, forgiveness of a portion of principal, an extended repayment period or a deed in lieu of foreclosure or other transfer of assets other than cash to fully or partially satisfy a debt. The Company's policy is to place all TDRs on nonaccrual for a minimum period of six months . Loans qualify for return to accrual status once they have demonstrated performance with the restructured terms of the loan agreement for a minimum of six months and the collection of principal and interest under the revised terms is deemed probable. All TDRs are considered to be impaired loans. FHLB stock and other restricted securities: FHLB, FRB and other restricted stock is carried at cost, classified as restricted securities and periodically evaluated for impairment based on the ultimate recoverability of the par value. Both cash and stock dividends are reported as interest income. Bank-Owned Life Insurance : The Company has purchased life insurance policies on certain key employees. The purchase of these life insurance policies allows the Company to use tax-advantaged rates of return. Bank-owned life insurance is recorded at the amount that can be realized under the insurance contract at the balance sheet date, which is the cash surrender value adjusted for other charges or other amounts due that are probable at settlement. Premises and Equipment : Land is carried at cost. Premises and equipment are stated at cost less accumulated depreciation. Buildings and related components are generally depreciated using the straight-line method with useful lives ranging from 10 to 30 years. Furniture, fixtures and equipment are generally depreciated using the straight-line method with useful lives ranging from 3 to 7 years. The cost of leasehold improvements is amortized over the shorter of the lease term or useful life using the straight-line method. Goodwill : Goodwill represents the excess of the cost of businesses acquired over the fair value of the net assets acquired. According to ASC 350-20, "Intangibles- Goodwill and Other", goodwill shall be tested for impairment between annual tests if an event occurs or circumstances change that would more likely than not reduce the fair value below its carrying amount. Deterioration in economic market conditions, changes in key personnel, increased estimates of the effects of recent regulatory or legislative changes, or additional regulatory or legislative changes may result in declines in projected business performance beyond management's current expectations. Such declines in business performance could cause the estimated fair value of goodwill to decline, which could result in an impairment charge to earnings in a future period related to goodwill. The Company evaluates goodwill for impairment on an annual basis or on an interim basis if an event occurs or circumstances change that would more likely than not reduce the fair value below its carrying amount, in accordance with ASC 350-20. During 2016, the Company changed its annual goodwill impairment testing date from December 31 to October 1. The Company believes that this new date is preferable as it provides additional time prior to the Company’s year-end to complete the annual goodwill impairment test, especially in the event of future acquisitions and growth. This change does not accelerate, delay, avoid or cause an impairment charge, nor does this change result in adjustments to previously issued financial statements. The Company first assesses qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount as a basis for determining the need to perform the two-step test for goodwill impairment (the qualitative method). If the qualitative method cannot be used or if it determines, based on the qualified method, that the fair value is more likely than not less than the carrying amount, the Company uses the two-step test. Under the two-step test, the Company compares the estimated fair value of a reporting unit with its carrying amount, including goodwill. If the estimated fair value of a reporting unit exceeds its carrying amount, goodwill of the reporting unit is considered not impaired. If the carrying amount of a reporting unit exceeds its estimated fair value, the second step of the goodwill impairment test is performed to measure the amount of impairment loss, if any. Step two of the goodwill impairment test compares the implied estimated fair value of reporting unit goodwill with the carrying amount of that goodwill. If the carrying amount of goodwill for that reporting unit exceeds the implied fair value of that unit's goodwill, an impairment loss is recognized in an amount equal to that excess. Additional information regarding goodwill and impairment testing can be found in Note 9 - Goodwill and Core Deposit Intangibles . Identifiable Intangibles : Intangible assets are acquired assets that lack physical substance but can be distinguished from goodwill because of contractual or other legal rights or because the asset is capable of being sold or exchanged either on its own or in combination with a related contract, asset, or liability. The Company's intangible assets relate to core deposits and customer relationships. Intangible assets with definite useful lives are amortized on an accelerated basis over their estimated life. Intangible assets, premises and equipment and other long-lived assets are tested for impairment whenever events or changes in circumstances indicate the carrying amount of the assets may not be recoverable from future undiscounted cash flows. If impaired, the assets are recorded at fair value. Foreclosed Assets : Assets acquired through loan foreclosure are initially recorded at the lower of the recorded investment in the loan at the time of foreclosure or the fair value less costs to sell, establishing a new cost basis. Any write-down in the carrying value of a property at the time of acquisition is charged-off to the allowance for loan losses. If fair value declines subsequent to foreclosure, a valuation allowance is recorded through expense. Operating costs after acquisition are expensed. Derivative Financial Instruments : The Company enters into the following derivative financial instruments: interest rate lock commitments, forward mortgage-backed securities trades and interest rate swaps and caps. These financial instruments are not designated as hedging instruments and are used for asset and liability management and commercial customers' financing needs. All derivatives are carried at fair value in either other assets or other liabilities. For additional information on derivative financial instruments, see Note 7 — Derivative Financial Instruments . Fair Value of Financial Instruments : In general, fair values of financial instruments are based upon quoted market prices, where available. If such quoted market prices are not available, fair value is based upon internally developed models that primarily use, as inputs, observable market-based parameters. Valuation adjustments may be made to ensure that financial instruments are recorded at fair value. These adjustments may include amounts to reflect counterparty credit quality and the Company’s creditworthiness, among other things, as well as unobservable parameters. Any such valuation adjustments are applied consistently over time. Fair value measurements and disclosures guidance establishes a three-level fair value hierarchy based on the markets in which the assets and liabilities are traded and the reliability of the assumptions used to determine fair value. For additional information on fair value measurements see Note 6 - Fair Value . Repurchase/Resell Agreements: The Company sells certain securities under agreements to repurchase. The securities sold under these agreements are treated as collateralized borrowings and are recorded at amounts equal to the cash received. The contractual terms of the agreements to repurchase may require the Company to provide additional collateral if the fair value of the securities underlying the borrowings declines during the term of the agreement. Brokerage Fee Income : Acting as an agent, the Company generates brokerage income by buying and selling securities on behalf of its customers through an independent third party and earning fees on the transactions. These fees are recorded on the trade date. Advertising Expense : The Company expenses all advertising costs as they are incurred. Advertising expenses were $3,861 , $3,773 , and $1,535 in 2016, 2015, and 2014, respectively. Share-Based Compensation : Compensation cost is recognized for stock options and restricted stock awards issued to employees and directors, based on the fair value of these awards at the date of grant. A Black-Scholes model is utilized to estimate the fair value of stock options, while the market price of the Company’s common stock at the date of grant is used for restricted stock awards. Compensation cost is recognized over the required service period, generally defined as the vesting period. For awards with time-based vesting, compensation cost is recognized on a straight-line basis over the requisite service period for the entire award. For awards with performance-based vesting conditions, compensation cost is recognized when the achievement of the performance condition is considered probable of achievement. If a performance condition is subsequently determined to be improbable of achievement, compensation cost is reversed. Retirement Plans: Employee 401(k) and profit sharing plan expense is the amount of matching contributions as determined by formula. Deferred compensation and supplemental retirement plan expense allocates the benefits over years of service. Income Taxes : Income tax expense is the total of the current year income tax due or refundable and the change in deferred tax assets and liabilities. Deferred tax assets and liabilities are the expected future tax amounts for the temporary differences between carrying amounts and tax bases of assets and liabilities, computed using enacted tax rates. A valuation allowance, if needed, reduces deferred tax assets to the amount expected to be realized. A tax position is recognized as a benefit only if it is “more likely than not” that the tax position would be sustained in a tax examination, with a tax examination being presumed to occur. The amount recognized is the largest amount of tax benefit that is greater than 50% likely of being realized on examination. For tax positions not meeting the “more likely than not” test, no tax benefit is recorded. The Company did not have any material uncertain tax positions which would require accrual at December 31, 2016 or 2015 . The Company recognizes interest and/or penalties related to income tax matters in income tax expense and did not have any amounts accrued for interest and penalties for the years ended December 31, 2016 or 2015 . The Company files a consolidated income tax return with its subsidiaries. Federal income tax expense or benefit has been allocated to subsidiaries on a separate return basis. Earnings per common share : The Company calculated earnings per common share in accordance with ASC 260, “Earnings Per Share,” which provides that unvested share-based payment awards that contain nonforfeitable rights to dividends or dividend equivalents (whether paid or unpaid) are participating securities and shall be included in the computation of earnings per share pursuant to the two-class method. The Company has determined that its outstanding non-vested stock awards are participating securities. Accordingly, earnings per common share is computed using the two-class method prescribed under ASC 260. Under the two-class method, basic earnings per common share is computed by dividing net earnings allocated to common stock by the weighted-average number of common shares outstanding during the applicable period, excluding outstanding participating securities. Diluted earnings per common share is computed using the weighted-average number of shares determined for the basic earnings per common share computation plus the dilutive effect of stock compensation using the treasury stock method. A reconciliation of the weighted-average shares used in calculating basic earnings per common share and the weighted average common shares used in calculating diluted earnings per common share for the reported periods is provided in Note 3 — Earnings Per Common Share . Comprehensive Income (Loss) : Comprehensive income (loss) consists of net income and other comprehensive income (loss). Other comprehensive income (loss) includes unrealized gains and losses on securities available for sale, net of taxes, which are also recognized as a separate component of equity. Employee stock ownership plan (ESOP) : The Company accounts for its ESOP in accordance with ASC 718-40, "Employee Stock Ownership Plans." Accordingly, since the Company sponsors the ESOP with an employer loan, neither the ESOP’s loan payable nor the Company’s loan receivable are reported in the Company’s consolidated balance sheet. Likewise, the Company does not recognize interest income or interest cost on the loan. Unallocated shares held by the ESOP are recorded as unearned ESOP shares in the consolidated statement of changes in shareholders’ equity. As shares are committed to be released for allocation, the Company recognizes compensation expense equal to the average market price of the shares for the period. Dividends on allocated ESOP shares reduce retained earnings; dividends on unearned ESOP shares reduce principal and accrued interest payable on the ESOP loan. Dividend Restriction : Banking regulations require maintaining certain capital levels and may limit the dividends paid by the Bank to the Company or by the Company to shareholders. Loss Contingencies : Loss contingencies, including claims and legal actions arising in the ordinary course of business, are recorded as liabilities when the likelihood of loss is probable and an amount or range of loss can be reasonably estimated. Management does not believe there now are such matters that will have a material effect on the financial statements. Transfers of Financial Assets : Transfers of financial assets are accounted for as sales when control over the assets has been surrendered. Control over transferred assets is deemed to be surrendered when (i) the assets have been isolated from the Company, (ii) the transferee has the right (free of conditions that constrain it from taking advantage of that right) to pledge or exchange the transferred assets, and (iii) the Company does not maintain effective control over the transferred assets through either (a) an agreement that entitles and obligates the Company to repurchase or

SHARE TRANSACTIONS

SHARE TRANSACTIONS	12 Months Ended
	Dec. 31, 2016
Stockholders' Equity Note [Abstract]
SHARE TRANSACTIONS	Share Transactions On August 22, 2012 , the Company announced its intention to repurchase up to 5% of its total common shares outstanding, or approximately 1,978,871 shares. The stock repurchase program, which is open-ended, allows the Company to repurchase its shares from time to time in the open market and in negotiated transactions, depending upon market conditions. The Board of Directors of the Company also authorized management to enter into a trading plan with Sandler O'Neill & Partners, LP in accordance with Rule 10b5-1 of the Securities Exchange Act of 1934, as amended (the “Act”), to facilitate repurchases of its common stock pursuant to the above mentioned stock repurchase program (the “Rule 10b5-1 plan”). Stock repurchases under this program were suspended in November 2013 as a result of the Company's announced acquisition of LegacyTexas Group, Inc., which automatically triggered termination of the 10b5-1 plan. At the time the stock repurchase program was suspended, 83,800 shares were repurchased during 2013 at a weighted average price per share of $18.55 . Upon completion of the acquisition of LegacyTexas Group, Inc. on January 1, 2015, the Company entered into a new trading plan with Sandler O’Neill & Partners, LP to facilitate repurchases of its common stock pursuant to the above mentioned stock repurchase program. During 2015, 357,950 shares were repurchased and retired at an average price of $22.32 . On March 1, 2016, the Company announced the resumption of the above mentioned stock repurchase program and again entered into a new 10b5-1 plan with Sandler O’Neill & Partners, LP. No shares of Company stock were repurchased under this program in 2016 , and 1,537,121 shares remain available for future repurchases under the program.

EARNINGS PER COMMON SHARE

EARNINGS PER COMMON SHARE	12 Months Ended
	Dec. 31, 2016
Earnings Per Share [Abstract]
EARNINGS PER COMMON SHARE	Note 3 — Earnings Per Common Share Basic earnings per common share is computed by dividing net income (which has been adjusted for distributed and undistributed earnings to participating securities) by the weighted-average number of common shares outstanding for the period, reduced for average unallocated ESOP shares and average unvested restricted stock awards. Unvested share-based awards that contain nonforfeitable rights to dividends or dividend equivalents (whether paid or unpaid) are participating securities and shall be included in the computation of earnings per share pursuant to the two-class method described in ASC 260-10-45-60B. Diluted earnings per common share reflects the potential dilution that could occur if securities or other contracts to issue common stock (such as stock awards and options) were exercised or converted to common stock, or resulted in the issuance of common stock that then shared in the Company’s earnings. Diluted earnings per common share is computed by dividing net income by the weighted-average number of common shares outstanding for the period increased for the dilutive effect of unexercised stock options and unvested restricted stock awards. The dilutive effect of the unexercised stock options and unvested restricted stock awards is calculated under the treasury stock method utilizing the average market value of the Company’s stock for the period. A reconciliation of the numerator and denominator of the basic and diluted earnings per common share computation for the years ended December 31, 2016 , 2015 and 2014 is as follows: Years Ended December 31, 2016 2015 2014 Basic earnings per share: Numerator: Net income $ 97,821 $ 70,916 $ 31,278 Distributed and undistributed earnings to participating securities (497 ) (534 ) (336 ) Income available to common shareholders $ 97,324 $ 70,382 $ 30,942 Denominator: Weighted average common shares outstanding 47,721,179 47,659,389 39,979,853 Less: Average unallocated ESOP shares (1,301,356 ) (1,464,324 ) (1,648,518 ) Average unvested restricted stock awards (235,749 ) (347,781 ) (412,270 ) Average shares for basic earnings per share 46,184,074 45,847,284 37,919,065 Basic earnings per common share $ 2.11 $ 1.54 $ 0.82 Diluted earnings per share: Numerator: Income available to common shareholders $ 97,324 $ 70,382 $ 30,942 Denominator: Average shares for basic earnings per share 46,184,074 45,847,284 37,919,065 Dilutive effect of share-based compensation plan 300,893 278,163 243,029 Average shares for diluted earnings per share 46,484,967 46,125,447 38,162,094 Diluted earnings per common share $ 2.09 $ 1.53 $ 0.81 Share awards excluded in the computation of diluted earnings per share because the exercise price was greater than the common stock average market price and were therefore anti-dilutive 1,384,784 1,012,771 412,706

SECURITIES

SECURITIES	12 Months Ended
	Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]
SECURITIES	Securities The amortized cost, related gross unrealized gains and losses recognized in accumulated other comprehensive income (loss), and the fair value of securities available for sale were as follows: December 31, 2016 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Agency residential mortgage-backed securities 1 $ 220,744 $ 635 $ 2,828 $ 218,551 Agency commercial mortgage-backed securities 1 9,422 — 75 9,347 Agency residential collateralized mortgage obligations 1 87,959 22 1,452 86,529 US government and agency securities 2,150 101 — 2,251 Municipal bonds 38,417 47 627 37,837 Total securities $ 358,692 $ 805 $ 4,982 $ 354,515 December 31, 2015 Agency residential mortgage-backed securities 1 $ 224,582 $ 841 $ 1,575 $ 223,848 Agency commercial mortgage-backed securities 1 9,483 — 66 9,417 Agency residential collateralized mortgage obligations 1 22,430 26 142 22,314 US government and agency securities 14,906 148 — 15,054 Municipal bonds 40,512 637 74 41,075 Total securities $ 311,913 $ 1,652 $ 1,857 $ 311,708 1 Mortgage-backed securities and collateralized mortgage obligations are issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises. The amortized cost (carrying amount), unrealized gains and losses, and fair value of securities held to maturity were as follows: December 31, 2016 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Agency residential mortgage-backed securities 1 $ 74,881 $ 1,147 $ 817 $ 75,211 Agency commercial mortgage-backed securities 1 28,023 836 166 28,693 Agency residential collateralized mortgage obligations 1 40,707 697 33 41,371 Municipal bonds 66,776 1,635 705 67,706 Total securities $ 210,387 $ 4,315 $ 1,721 $ 212,981 December 31, 2015 Agency residential mortgage-backed securities 1 $ 87,935 $ 1,837 $ 284 $ 89,488 Agency commercial mortgage-backed securities 1 24,848 913 64 25,697 Agency residential collateralized mortgage obligations 1 59,174 1,087 55 60,206 Municipal bonds 68,476 3,447 112 71,811 Total securities $ 240,433 $ 7,284 $ 515 $ 247,202 1 Mortgage-backed securities and collateralized mortgage obligations are issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises. The amortized cost (carrying amount) and fair value of held to maturity debt securities and the fair value of available for sale debt securities at December 31, 2016 by contractual maturity are set forth below in the table below. Securities with contractual payments not due at a single maturity date, including mortgage backed securities and collateralized mortgage obligations, are shown separately. Held to maturity Available for sale Carrying Amount Fair Value Fair Value Due in one year or less $ 1,952 $ 1,965 $ 2,159 Due after one to five years 9,035 9,293 11,909 Due after five to ten years 48,327 49,226 17,648 Due after ten years 7,462 7,222 8,372 Agency residential mortgage-backed securities 74,881 75,211 218,551 Agency commercial mortgage-backed securities 28,023 28,693 9,347 Agency residential collateralized mortgage obligations 40,707 41,371 86,529 Total $ 210,387 $ 212,981 $ 354,515 Securities with a carrying value of $224,674 and $280,629 at December 31, 2016 and 2015 , respectively, were pledged to secure public deposits, repurchase agreements and for other purposes required or permitted by law. At December 31, 2016 and 2015 , there were no holdings of securities of any one issuer, other than the U.S. Government and its agencies or U.S. Government Sponsored Enterprises, in an amount greater than 10% of shareholders’ equity. Sales activity of securities for the years ended December 31, 2016 , 2015 and 2014 was as follows. All securities sold were classified as available for sale. December 31, 2016 2015 2014 Proceeds $ 7,700 $ 36,984 $ — Gross gains 72 278 — Gross losses 7 50 — Tax expense of securities gains/losses reclassified from accumulated other comprehensive income 23 80 — Securities with unrealized losses at December 31, 2016 and 2015 , aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, were as follows: AFS Less than 12 Months 12 Months or More Total December 31, 2016 Fair Value Unrealized Loss Fair Value Unrealized Loss Fair Value Unrealized Loss Agency residential mortgage-backed securities 1 $ 167,503 $ 2,770 $ 7,516 $ 58 $ 175,019 $ 2,828 Agency commercial mortgage-backed securities 1 9,347 75 — — 9,347 75 Agency residential collateralized mortgage obligations 1 72,822 1,420 2,649 32 75,471 1,452 Municipal bonds 26,911 512 3,412 115 30,323 627 Total temporarily impaired $ 276,583 $ 4,777 $ 13,577 $ 205 $ 290,160 $ 4,982 December 31, 2015 Agency residential mortgage-backed securities 1 $ 158,172 $ 1,353 $ 10,474 $ 222 $ 168,646 $ 1,575 Agency commercial mortgage-backed securities 1 9,417 66 — — 9,417 66 Agency residential collateralized mortgage obligations 1 13,517 81 6,992 61 20,509 142 Municipal bonds 7,249 74 — — 7,249 74 Total temporarily impaired $ 188,355 $ 1,574 $ 17,466 $ 283 $ 205,821 $ 1,857 HTM Less than 12 Months 12 Months or More Total December 31, 2016 Fair Value Unrealized Loss Fair Value Unrealized Loss Fair Value Unrealized Loss Agency residential mortgage-backed securities 1 $ 41,375 $ 817 $ — $ — $ 41,375 $ 817 Agency commercial mortgage-backed securities 1 7,273 166 — — 7,273 166 Agency residential collateralized mortgage obligations 1 6,322 11 1,451 22 7,773 33 Municipal bonds 19,362 658 1,045 47 20,407 705 Total temporarily impaired $ 74,332 $ 1,652 $ 2,496 $ 69 $ 76,828 $ 1,721 December 31, 2015 Agency residential mortgage-backed securities 1 $ 41,935 $ 284 $ — $ — $ 41,935 $ 284 Agency commercial mortgage-backed securities 1 3,805 64 — — 3,805 64 Agency residential collateralized mortgage obligations 1 3,714 6 3,060 49 6,774 55 Municipal bonds 1,638 10 6,369 102 8,007 112 Total temporarily impaired $ 51,092 $ 364 $ 9,429 $ 151 $ 60,521 $ 515 1 Mortgage-backed securities and collateralized mortgage obligations are issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises. As of December 31, 2016 , 241 securities had unrealized losses, 21 of which had been in an unrealized loss position for over 12 months at December 31, 2016 . The Company does not believe these unrealized losses are other-than-temporary and at December 31, 2016 had the intent and ability to retain its investment in the issuer for a period of time sufficient to allow for any anticipated recovery in fair value. All principal and interest payments are being received on time and in full.

LOANS

LOANS	12 Months Ended
	Dec. 31, 2016
Receivables [Abstract]
LOANS	Loans Loans consist of the following: December 31, 2016 December 31, 2015 Loans held for sale $ 21,279 $ 22,535 Loans held for investment: Commercial real estate $ 2,670,455 $ 2,177,543 Commercial and industrial 1,971,160 1,612,669 Construction and land 294,894 269,708 Consumer real estate 1,074,923 936,757 Other consumer 53,991 69,830 Gross loans held for investment, excluding Warehouse Purchase Program 6,065,423 5,066,507 Net of: Deferred fees and discounts, net (2,251 ) (1,860 ) Allowance for loan losses (64,576 ) (47,093 ) Net loans held for investment, excluding Warehouse Purchase Program 5,998,596 5,017,554 Warehouse Purchase Program 1,055,341 1,043,719 Total loans held for investment $ 7,053,937 $ 6,061,273 Activity in the allowance for loan losses for the years ended December 31, 2016 , 2015 and 2014 , segregated by portfolio segment and evaluation for impairment, is set forth below. The below activity does not include Warehouse Purchase Program loans, which are collectively evaluated for impairment and are purchased under several contractual requirements, providing safeguards to the Company. To date, the Company has not experienced a loss on these loans and no allowance for loan losses has been allocated to them. At December 31, 2016 , 2015 and 2014 , the allowance for loan impairment related to purchased credit impaired ("PCI") loans totaled $180 , $150 , and $180 , respectively. December 31, 2016 Commercial Real Estate Commercial and Industrial Construction and Land Consumer Real Estate Other Consumer Total Allowance for loan losses: Beginning balance - January 1, 2016 $ 14,123 $ 24,975 $ 3,013 $ 3,992 $ 990 $ 47,093 Charge-offs (79 ) (7,746 ) — (107 ) (927 ) (8,859 ) Recoveries 21 472 — 109 340 942 Provision expense 4,238 17,763 2,062 490 847 25,400 Ending balance - December 31, 2016 $ 18,303 $ 35,464 $ 5,075 $ 4,484 $ 1,250 $ 64,576 Allowance ending balance: Individually evaluated for impairment $ 300 $ 4,521 $ — $ 138 $ 52 $ 5,011 Collectively evaluated for impairment 18,003 30,943 5,075 4,346 1,198 59,565 Loans: Individually evaluated for impairment 5,195 86,664 11,385 3,300 75 106,619 Collectively evaluated for impairment 2,659,644 1,884,263 283,509 1,070,732 53,683 5,951,831 PCI loans 5,616 233 — 891 233 6,973 Ending balance $ 2,670,455 $ 1,971,160 $ 294,894 $ 1,074,923 $ 53,991 $ 6,065,423 December 31, 2015 Commercial Real Estate Commercial and Industrial Construction and Land Consumer Real Estate Other Consumer Total Allowance for loan losses: Beginning balance - January 1, 2015 $ 11,830 $ 9,068 $ 174 $ 4,069 $ 408 $ 25,549 Charge-offs (167 ) (3,129 ) — (321 ) (1,090 ) (4,707 ) Recoveries 29 246 — 85 426 786 Provision expense 2,431 18,790 2,839 159 1,246 25,465 Ending balance - December 31, 2015 $ 14,123 $ 24,975 $ 3,013 $ 3,992 $ 990 $ 47,093 Allowance ending balance: Individually evaluated for impairment $ 366 $ 1,470 $ — $ 81 $ 61 $ 1,978 Collectively evaluated for impairment 13,757 23,505 3,013 3,911 929 45,115 Loans: Individually evaluated for impairment 11,580 16,906 33 4,767 120 33,406 Collectively evaluated for impairment 2,155,351 1,595,548 269,675 931,140 69,433 5,021,147 PCI loans 10,612 215 — 850 277 11,954 Ending balance $ 2,177,543 $ 1,612,669 $ 269,708 $ 936,757 $ 69,830 $ 5,066,507 December 31, 2014 Commercial Real Estate Commercial and Industrial Construction and Land Consumer Real Estate Other Consumer Total Allowance for loan losses: Beginning balance - January 1, 2014 $ 10,944 $ 4,536 $ 212 $ 3,280 $ 386 $ 19,358 Charge-offs — (568 ) (51 ) (237 ) (605 ) (1,461 ) Recoveries 435 94 1 38 363 931 Provision expense 451 5,006 12 988 264 6,721 Ending balance - December 31, 2014 $ 11,830 $ 9,068 $ 174 $ 4,069 $ 408 $ 25,549 Allowance ending balance: Individually evaluated for impairment $ 826 $ 1,840 $ — $ 223 $ 6 $ 2,895 Collectively evaluated for impairment 11,004 7,228 174 3,846 402 22,654 Loans: Individually evaluated for impairment 7,405 5,929 103 5,607 284 19,328 Collectively evaluated for impairment 1,253,336 775,699 21,195 517,492 40,042 2,607,764 PCI loans 5,127 196 — 1,100 165 6,588 Ending balance $ 1,265,868 $ 781,824 $ 21,298 $ 524,199 $ 40,491 $ 2,633,680 Changes in the allowance for off-balance sheet credit losses on lending-related commitments, included in "accrued expenses and other liabilities" on the consolidated balance sheets, are summarized in the following table. Please see Note 17 - Commitments and Contingent Liabilities for more information. Year Ended December 31, 2016 Balance at beginning of period $ — Charge-offs on lending-related commitments — Provision for credit losses on lending-related commitments 1,500 Balance at end of period $ 1,500 Impaired loans at December 31, 2016 and 2015 , were as follows 1 : December 31, 2016 Unpaid Principal Balance Recorded Investment With No Allowance Recorded Investment With Allowance Total Recorded Investment Related Allowance Commercial real estate $ 5,388 $ 4,429 $ 766 $ 5,195 $ 272 Commercial and industrial 87,756 73,377 13,287 86,664 4,519 Construction and land 11,384 11,385 — 11,385 — Consumer real estate 3,766 3,290 10 3,300 10 Other consumer 107 33 42 75 30 Total $ 108,401 $ 92,514 $ 14,105 $ 106,619 $ 4,831 December 31, 2015 Commercial real estate $ 11,682 $ 10,618 $ 962 $ 11,580 $ 303 Commercial and industrial 18,649 13,894 3,012 16,906 1,467 Construction and land 38 33 — 33 — Consumer real estate 5,327 4,754 13 4,767 13 Other consumer 199 49 71 120 45 Total $ 35,895 $ 29,348 $ 4,058 $ 33,406 $ 1,828 1 No Warehouse Purchase Program loans were impaired at December 31, 2016 or 2015 . Loans reported do not include PCI loans. Income on impaired loans at December 31, 2016 , 2015 and 2014 , was as follows 1 December 31, 2016 December 31, 2015 December 31, 2014 Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized Commercial real estate $ 5,240 $ 9 $ 8,178 $ 24 $ 8,128 $ 23 Commercial and industrial 28,634 1 19,595 8 6,119 11 Construction and land 901 — 84 — 54 — Consumer real estate 4,831 14 5,269 7 5,008 26 Other consumer 95 4 202 2 433 5 Total $ 39,701 $ 28 $ 33,328 $ 41 $ 19,742 $ 65 1 Loans reported do not include PCI loans. Loans past due over 90 days that were still accruing interest totaled $141 and $111 at December 31, 2016 and 2015 , which consisted entirely of PCI loans. At December 31, 2016 , no PCI loans were considered non-performing loans. No Warehouse Purchase Program loans were non-performing at December 31, 2016 or 2015 . Non-performing (nonaccrual) loans were as follows: December 31, 2016 2015 Commercial real estate $ 5,195 $ 11,418 Commercial and industrial 86,664 16,877 Construction and land 11,385 33 Consumer real estate 7,987 9,781 Other consumer 158 107 Total $ 111,389 $ 38,216 For the years ended December 31, 2016 , 2015 and 2014 , gross interest income which would have been recorded had the non-accruing loans been current in accordance with their original terms amounted to $1,746 , $1,594 and $1,192 , respectively. No interest income was recorded on these loans for the years ended December 31, 2016 , 2015 and 2014 . The outstanding balances of TDRs are shown below: December 31, 2016 2015 Nonaccrual TDRs (1) $ 11,701 $ 6,207 Performing TDRs (2) 454 605 Total $ 12,155 $ 6,812 Specific reserves on TDRs $ 1,686 $ 487 Outstanding commitments to lend additional funds to borrowers with TDR loans — — 1 Nonaccrual TDR loans are included in the nonaccrual loan totals. 2 Performing TDR loans are loans that have been performing under the restructured terms for at least six months and the Company is accruing interest on these loans. The following table provides the recorded balances of loans modified as a TDR during the years ended December 31, 2016 , 2015 and 2014 . December 31, 2016 Principal Deferrals 1 Combination of Rate Reduction & Principal Deferral Other Total Commercial and industrial $ 685 $ — $ 7,090 (2) $ 7,775 Consumer real estate — 79 — 79 Other consumer 1 — — 1 Total $ 686 $ 79 $ 7,090 $ 7,855 December 31, 2015 Commercial real estate $ 100 $ — $ — $ 100 Commercial and industrial — — 191 191 Consumer real estate 209 60 36 305 Other consumer 1 — 3 4 Total $ 310 $ 60 $ 230 $ 600 December 31, 2014 Commercial and industrial $ 28 $ — $ 1,750 $ 1,778 Construction and land — — 102 102 Consumer real estate 197 262 461 920 Other consumer 11 6 — 17 Total $ 236 $ 268 $ 2,313 $ 2,817 1 Principal deferrals include Chapter 7 bankruptcy loans for which the court has discharged the borrower's obligation and the borrower has not reaffirmed the debt. Such loans are placed on non-accrual status. 2 Includes a $6.2 million reserve-based energy relationship; the primary modification to this relationship was suspension of required borrowing base payments. Loans modified as a TDR during the years ended December 31, 2016 , 2015 and 2014 , which experienced a subsequent payment default during the periods, are shown below. A payment default is defined as a loan that was 90 days or more past due. Years Ended December 31, 2016 2015 2014 Consumer real estate $ 31 $ 178 $ 107 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 consolidated balance sheets and the related outstanding balances at December 31, 2016 and 2015 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. December 31, 2016 2015 Carrying amount 1 $ 6,793 $ 11,804 Outstanding balance 7,597 13,053 1 The carrying amounts are reported net of allowance for loan losses of $180 and $150 as of December 31, 2016 and 2015 . Changes in the accretable yield for PCI loans for the years ended December 31, 2016 and 2015 , are as follows: December 31, 2016 2015 Balance at beginning of period $ 3,356 $ 2,100 Additions — 1,907 Reclassifications (to) from nonaccretable 429 1,754 Disposals (359 ) (1,007 ) Accretion (911 ) (1,398 ) Balance at end of period $ 2,515 $ 3,356 Below is an analysis of the age of recorded investment in loans that were past due at December 31, 2016 and 2015 . No Warehouse Purchase Program loans were delinquent at December 31, 2016 or 2015 and therefore are not included in the following table. December 31, 2016 30-59 Days Past Due 60-89 Days Past Due 90 Days and Greater Past Due Total Loans Past Due Current Loans 1 Total Loans Commercial real estate $ 1,829 $ 72 $ 766 $ 2,667 $ 2,667,788 $ 2,670,455 Commercial and industrial 20,910 495 46 21,451 1,949,709 1,971,160 Construction and land 19,517 283 — 19,800 275,094 294,894 Consumer real estate 10,487 1,916 1,199 13,602 1,061,321 1,074,923 Other consumer 1,523 31 6 1,560 52,431 53,991 Total $ 54,266 $ 2,797 $ 2,017 $ 59,080 $ 6,006,343 $ 6,065,423 December 31, 2015 Commercial real estate $ 16 $ 176 $ 10,269 $ 10,461 $ 2,167,082 $ 2,177,543 Commercial and industrial 884 670 12,255 13,809 1,598,860 1,612,669 Construction and land 623 — — 623 269,085 269,708 Consumer real estate 10,880 2,463 3,458 16,801 919,956 936,757 Other consumer 463 37 — 500 69,330 69,830 Total $ 12,866 $ 3,346 $ 25,982 $ 42,194 $ 5,024,313 $ 5,066,507 1 Includes acquired PCI loans with a total carrying value of $6,729 and $11,328 at December 31, 2016 and 2015 , respectively. The recorded investment in loans by credit quality indicators at December 31, 2016 and 2015 , was as follows. Real Estate and Commercial and Industrial Credit Exposure Credit Risk Profile by Internally Assigned Grade December 31, 2016 Commercial Real Estate Commercial and Industrial Construction and Land Consumer Real Estate Grade: 1 Pass $ 2,648,842 $ 1,712,171 $ 283,423 $ 1,062,549 Special Mention 7,972 155,110 — 2,083 Substandard 12,875 103,815 11,471 8,252 Doubtful 766 64 — 2,039 Total $ 2,670,455 $ 1,971,160 $ 294,894 $ 1,074,923 December 31, 2015 Grade: 1 Pass $ 2,135,539 $ 1,460,725 $ 269,582 $ 920,519 Special Mention 13,633 92,048 — 3,327 Substandard 27,572 59,835 93 9,606 Doubtful 799 61 33 3,305 Total $ 2,177,543 $ 1,612,669 $ 269,708 $ 936,757 1 PCI loans are included in the substandard or doubtful categories for December 31, 2016 and 2015 , respectively. These categories are generally consistent with the "substandard" and "doubtful" categories as defined by regulatory authorities. Warehouse Purchase Program Credit Exposure All Warehouse Purchase Program loans were graded pass as of December 31, 2016 and 2015 . Consumer Other Credit Exposure Credit Risk Profile Based on Payment Activity December 31, 2016 December 31, 2015 Performing $ 53,833 $ 69,723 Non-performing 158 107 Total $ 53,991 $ 69,830

FAIR VALUE

FAIR VALUE	12 Months Ended
	Dec. 31, 2016
Fair Value Disclosures [Abstract]
FAIR VALUE	Note 6 - Fair Value ASC 820, “Fair Value Measurements and Disclosures”, establishes a fair value hierarchy which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The standard describes three levels of inputs that may be used to measure fair value: Level 1: Quoted prices (unadjusted) for identical assets or liabilities in active markets that the entity has the ability to access as of the measurement date. Level 2: Significant other observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data. Level 3: Prices or valuation techniques that require inputs that are both significant and unobservable in the market. These instruments are valued using the best information available, some of which is internally developed, and reflects a reporting entity’s own assumptions about the risk premiums that market participants would generally require and the assumptions they would use. Assets and Liabilities Measured on a Recurring Basis Assets and liabilities measured at fair value on a recurring basis are summarized below. Fair Value Measurements Using Level 2 December 31, 2016 December 31, 2015 Assets: Agency residential mortgage-backed securities $ 218,551 $ 223,848 Agency commercial mortgage-backed securities 9,347 9,417 Agency residential collateralized mortgage obligations 86,529 22,314 US government and agency securities 2,251 15,054 Municipal bonds 37,837 41,075 Total securities available for sale $ 354,515 $ 311,708 Loans held for sale 1 $ 21,279 $ 22,535 Derivative financial instruments: Interest rate lock commitments 379 421 Forward mortgage-backed securities trades 36 15 Loan customer counterparty — 260 Financial institution counterparty 1,369 — Liabilities: Derivative financial instruments: Interest rate lock commitments — — Forward mortgage-backed securities trades 80 29 Loan customer counterparty 1,369 — Financial institution counterparty — 260 1 At December 31, 2016 and 2015 , loans held for sale had an aggregate outstanding principal balance of $20,946 and $21,851 . There were no mortgage loans held for sale that were 90 days or greater past due or on non-accrual at December 31, 2016 . The following methodologies were used to measure the fair value of financial assets and liabilities valued on a recurring basis: Securities available for sale - The fair values of securities available for sale are determined by matrix pricing, which is a mathematical technique widely used in the industry to value debt securities without relying exclusively on quoted prices for the specific securities but rather by relying on the securities' relationship to other benchmark quoted securities (Level 2 inputs). Residential mortgage loans held for sale - Mortgage loans held for sale, which are sold on a servicing released basis, are valued using a market approach by utilizing either: (i) the fair value of securities backed by similar mortgage loans, adjusted for certain factors to approximate the fair value of a whole mortgage loan, including the value attributable to mortgage servicing and credit risk, (ii) current commitments to purchase loans or (iii) recent observable market trades for similar loans, adjusted to credit risk and other individual loan characteristics. As these prices are derived from market observable inputs, the Company classifies these valuations as Level 2 in the fair value disclosures. Interest income on mortgage loans held for sale is recognized based on the contractual rates and reflected in interest income on loans held for sale in the consolidated income statement. The Company has no continuing involvement in any residential mortgage loans sold. Derivative instruments - The Company enters into a variety of derivative instruments as part of its hedging strategy and measures these instruments at fair value on a recurring basis in the balance sheet. The majority of these derivatives are forward mortgage-backed securities and are exchange-traded or traded within highly active dealer markets. In order to determine the fair value of these instruments, the Company utilized the exchange price or dealer market price for the particular derivative contract; therefore these contracts are classified as Level 2. In addition, the Company enters into interest rate lock commitments ("IRLCs") with prospective borrowers. These commitments are carried at fair value based on the fair value of the underlying mortgage loans which are based on observable market data. The Company adjusts the outstanding IRLCs with prospective borrowers based on an expectation that it will be exercised and the loan will be funded. These commitments are classified as Level 2 in the fair value disclosures, as the valuations are based on market observable inputs. The Company also enters into certain interest rate derivative positions that are not designated as hedging instruments. The estimated fair value of these commercial loan interest rate swaps are obtained from a pricing service that provides the swaps' unwind value (Level 2 inputs). Please see Note 7 — Derivative Financial Instruments for more information. Assets and Liabilities Measured on a Non-Recurring Basis Assets measured at fair value on a non-recurring basis are summarized below. There were no liabilities measured at fair value on a non-recurring basis as of December 31, 2016 or 2015 . Fair Value Measurements Using Level 3 December 31, 2016 December 31, 2015 Assets: Impaired loans $ 9,274 $ 2,230 Foreclosed assets: Commercial real estate 10,638 4,784 Construction and land 194 1,802 Consumer real estate — 106 Other 6 — Methodologies used to measure the fair value of financial assets and liabilities valued on a non-recurring basis are shown below: Impaired loans - Impaired loans that are collateral dependent are measured for impairment using the fair value of the collateral adjusted by additional Level 3 inputs, such as discounts of market value, estimated marketing costs and estimated legal expenses. Impaired loans secured by real estate, receivables or inventory had discounts determined by management on an individual loan basis. Impaired loans that are not collateral dependent are measured for impairment by a discounted cash flow analysis using a net present value calculation that utilizes data from the loan file before and after the modification. Foreclosed assets - These assets are measured at the lower of book or fair value less costs to sell using third party appraisals, listing agreements or sale contracts, which may be adjusted by additional Level 3 inputs, such as discounts of market value, estimated marketing costs and estimated legal expenses. Management may also consider additional adjustments on specific properties due to the age of the appraisal, expected holding period, lack of comparable sales, or if the other real estate owned is a special use property. At December 31, 2016 , the Company had $92 in residential mortgage loans in the process of foreclosure. The Credit Risk Management department evaluates the valuations on impaired loans and foreclosed assets at least quarterly. The valuations on impaired loans are reviewed at least quarterly by the Allowance for Loan Loss Committee and are considered in the calculation of the allowance for loan losses. Unobservable inputs, such as discounts to collateral, are monitored and adjusted if market conditions change. Fair Value of Financial Instruments Not Recorded at Fair Value The carrying amount and fair value information of financial instruments not recorded at fair value in their entirety on a recurring basis on the Company's consolidated balance sheets at December 31, 2016 and 2015 , were as follows: Fair Value December 31, 2016 Carrying Amount Level 1 Level 2 Level 3 Financial assets Cash and cash equivalents $ 289,212 $ 289,212 $ — $ — Securities held to maturity 210,387 — 212,981 — Loans held for investment, net 5,998,596 — — 6,080,165 Loans held for investment - Warehouse Purchase Program 1,055,341 — — 1,055,219 FHLB and other restricted securities, at cost 43,266 — 43,266 — Accrued interest receivable 20,347 20,347 — — Financial liabilities Deposits $ 6,365,476 $ — $ — $ 5,989,933 FHLB advances 833,682 — — 830,930 Repurchase agreements 86,691 — — 84,265 Subordinated debt 134,032 — — 121,743 Accrued interest payable 2,111 2,111 — — December 31, 2015 Financial assets Cash and cash equivalents $ 615,639 $ 615,639 $ — $ — Securities held to maturity 240,433 — 247,202 — Loans held for investment, net 5,017,554 — — 5,083,093 Loans held for investment - Warehouse Purchase Program 1,043,719 — — 1,042,434 FHLB and other restricted securities, at cost 63,075 — 63,075 — Accrued interest receivable 17,109 17,109 — — Financial liabilities Deposits $ 5,226,711 $ — $ — $ 4,920,648 FHLB advances 1,439,904 — — 1,433,125 Repurchase agreement 83,269 — — 81,956 Subordinated debt 84,992 — — 85,771 Accrued interest payable 1,653 1,653 — — The following methods and assumptions were used to estimate the fair values of each class of financial instrument presented: Cash and cash equivalents - Due to their short term nature, the carrying amount approximates the estimated fair value. Securities held to maturity - The fair values of these securities is determined by matrix pricing, which is a mathematical technique widely used in the industry to value debt securities without relying exclusively on quoted prices for the specific securities but rather by relying on the securities' relationship to other benchmark quoted securities (Level 2 inputs). Loans held for investment (including Warehouse Purchase Program loans) - Fair value is based on discounted cash flows using current market offering rates, estimated life, and applicable credit risk. FHLB stock and other restricted securities - The fair value on these securities is their cost basis due to restrictions on transferability. Accrued interest receivable - Due to their short term nature, the carrying amount approximates the estimated fair value. Deposits - Fair value is calculated using the FHLB advance curve to discount cash flows based on the estimated life of the deposits. FHLB advances - Fair value is calculated using the FHLB advance curve to discount cash flows based on the contractual repayment schedule. Repurchase agreement - The fair value is based on discounting the estimated cash flows using the current rate at which similar borrowings would be made with similar terms and remaining maturities. Subordinated debt - The estimated fair value is based on current market rates on similar debt in the market. Accrued interest payable - Due to their short term nature, the carrying amount approximates the estimated fair value. The fair value of off-balance sheet items is based on the current fees or costs that would be charged to enter into or terminate such arrangements and are not considered significant to this presentation.

DERIVATIVE FINANCIAL INSTRUMENT

DERIVATIVE FINANCIAL INSTRUMENTS	12 Months Ended
	Dec. 31, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
DERIVATIVE FINANCIAL INSTRUMENTS	Note 7 — Derivative Financial Instruments The following table provides the outstanding notional balances and fair values of outstanding derivative positions at December 31, 2016 and 2015 . December 31, 2016 December 31, 2015 Outstanding Notional Balance Asset Derivative Fair Value Liability Derivative Fair Value Outstanding Notional Balance Asset Derivative Fair Value Liability Derivative Fair Value IRLCs $ 10,952 $ 379 $ — $ 12,518 $ 421 $ — Forward mortgage-backed securities trades 18,613 36 80 20,374 15 29 Commercial loan interest rate swaps and caps: Loan customer counterparty 112,294 — 1,369 24,796 $ 260 — Financial institution counterparty 112,294 1,369 — 24,796 — 260 IRLCs - The Company enters into IRLCs with prospective residential mortgage borrowers whereby the interest rate on the loan is determined prior to funding and the borrowers have locked into that interest rate. The estimated fair values of IRLCs are based on the fair value of the related mortgage loan which is based observable market data. The Company adjusts the outstanding IRLCs based on the expectation that it will be exercised and the loan will be funded. Forward mortgage-backed securities trades - To manage the price risk associated with IRLCs, the Company enters into forward sales of mortgage-backed securities in an amount similar to the portion of the IRLC expected to close, assuming no change in mortgage interest rates. In addition, to manage the interest rate risk associated with mortgage loans held for sale, the Company enters into forward sales of mortgage-backed securities to deliver mortgage loan inventory to investors. The estimated fair values of forward sales of mortgage-backed securities and forward sale commitments are based on quoted market values. Interest rate swaps and caps - These derivative positions relate to transactions in which we enter into an interest rate swap or cap with a customer, while at the same time entering into an offsetting interest rate swap or cap with another financial institution. An interest rate swap transaction allows our customer to effectively convert a variable rate loan to a fixed rate. In connection with each swap, we agree to pay interest to the customer on a notional amount at a variable interest rate and receive interest from the customer on a similar notional amount at a fixed interest rate. At the same time, we agree to pay another financial institution the same fixed interest rate on the same notional amount and receive the same variable interest rate on the same notional amount. In connection with each interest rate cap, we sell a cap to the customer and agree to pay interest if the underlying index exceeds the strike price defined in the cap agreement. Simultaneously we purchase a cap with matching terms from another financial institution which agrees to pay us if the underlying index exceeds the strike price. The commercial loan customer counterparty weighted average received and paid interest rates for interest rate swaps outstanding at December 31, 2016 and 2015 are presented in the following table. Weighted-Average Interest Rate December 31, 2016 December 31, 2015 Received Paid Received Paid Loan customer counterparty 3.12 % 2.36 % 5.01 % 3.37 % Our credit exposure on interest rate swaps is limited to the net favorable value of all swaps by each counterparty, which was approximately $118 at December 31, 2016. This credit exposure is partly mitigated as transactions with customers are generally secured by the collateral, if any, securing the underlying transaction being hedged. Our credit exposure, net of collateral pledged, relating to interest rate swaps with upstream financial institution counterparties was approximately $1,335 at December 31, 2016. A credit support annex is in place and allows the bank to call collateral from upstream financial institution counterparties. Collateral levels are monitored and adjusted on a regular basis for changes in interest rate swap values. Our cash collateral pledged for interest rate swaps and included in our interest-bearing deposits, which totaled $1,950 and $300 at December 31, 2016 and 2015 respectively, is in excess of our credit exposure. The initial and subsequent changes in the fair value of IRLCs and the forward sales of mortgage-back securities are recorded in net gain on sale of mortgage loans. These gains and losses were not attributable to instrument-specific credit risk. For interest rate swaps and caps, because we act as an intermediary for our customer, changes in the fair value of the underlying derivative contracts substantially offset each other and do not have a material impact on our results of operations. Income (loss) for the years ending December 31, 2016 , 2015 and 2014 was as follows: Derivatives not designated as hedging instruments Years Ended December 31, 2016 2015 2014 IRLC's $ (43 ) $ 8 $ — Forward mortgage-backed securities trades 13 (195 ) —

PREMISES AND EQUIPMENT

PREMISES AND EQUIPMENT	12 Months Ended
	Dec. 31, 2016
Property, Plant and Equipment [Abstract]
PREMISES AND EQUIPMENT	Premises and Equipment Premises and equipment were as follows: December 31, 2016 2015 Land $ 23,636 $ 25,546 Buildings 59,298 60,807 Furniture, fixtures and equipment 19,561 18,848 Leasehold improvements 7,674 7,556 110,169 112,757 Less: accumulated depreciation (35,943 ) (35,120 ) Total $ 74,226 $ 77,637 Depreciation expense was $6,186 , $6,550 and $4,047 for 2016 , 2015 and 2014 , respectively. Operating Leases : The Company leases certain bank or loan production office properties and equipment under operating leases. Certain leases contain renewal options that may be exercised. Rent expense was $7,928 , $6,895 and $2,317 for 2016 , 2015 and 2014 , respectively. Rent commitments, before considering applicable renewal options, as of December 31, 2016 , were as follows: Balance 2017 $ 6,218 2018 5,634 2019 4,791 2020 4,424 2021 4,238 Thereafter 20,572 Total $ 45,877 The Company leases office space in certain locations to other unaffiliated tenants. Rental income of $704 was recognized during 2016 . This rental income is recorded in the consolidated statement of income as an offset to occupancy expense. Aggregate future minimum rental payments to be received under non-cancelable subleases at December 31, 2016 , were $1,087 . At December 31, 2016 , the Company had no commitments for future locations and held two parcels of land for future development. The Company sold one of these parcels of land in January 2017, resulting in a gain of $1,304 .

GOODWILL AND CORE DEPOSIT INTAN

GOODWILL AND CORE DEPOSIT INTANGIBLES	12 Months Ended
	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
GOODWILL AND CORE DEPOSIT INTANGIBLES	Note 9 - Goodwill and Core Deposit Intangibles Goodwill and other intangible assets are presented in the table below. Changes in the carrying amount of the Company's goodwill and core deposit intangibles (“CDI”) for years ended December 31, 2016 and 2015 , were as follows: Goodwill Core Deposit Intangibles Balance as of December 31, 2014 $ 29,650 $ 616 LegacyTexas Group, Inc. acquisition 151,126 880 Amortization of core deposit intangible — (466 ) Balance as of December 31, 2015 180,776 1,030 Disposition of insurance subsidiary goodwill upon the sale of subsidiary operations (2,217 ) — Amortization of core deposit intangible — (365 ) Balance as of December 31, 2016 $ 178,559 $ 665 Management performs an evaluation annually, and more frequently if a triggering event occurs, of whether any impairment of the goodwill or other intangibles has occurred. CDI are amortized on an accelerated basis over their estimated lives with a weighted average amortization period of 8 years . The CDI amortization expense is reported in other non-interest expense on the Company's consolidated statements of income. The estimated aggregate future amortization expense for CDI remaining as of December 31, 2016 is as follows: Balance 2017 $ 263 2018 156 2019 101 2020 73 2021 48 Thereafter 24

DEPOSITS

DEPOSITS	12 Months Ended
	Dec. 31, 2016
Banking and Thrift [Abstract]
DEPOSITS	Deposits Time deposits of $250 or more totaled $951,688 and $503,719 at December 31, 2016 and 2015 , respectively. The $ 250 FDIC insurance coverage limit applies per depositor, per insured depository institution, for each account ownership category. At December 31, 2016 and 2015 , the Company had $355,455 and $371,692 in reciprocal deposits, respectively. These consisted entirely of certificates of deposit made under the Company's participation in the Certificate of Deposit Account Registry Service® (CDARS®) and Insured Cash Sweep (ICS) money market product. Through CDARS®, the Company can provide a depositor the ability to place up to $50,000 on deposit with the Company while receiving FDIC insurance on the entire deposit by placing customer funds in excess of the FDIC deposit limits with other financial institutions in the CDARS® network. In return, these financial institutions place customer funds with the Company on a reciprocal basis. Similarly, customer funds in our ICS money market product are swept from a transaction account at the Company into money market accounts at multiple banks to allow access to FDIC insurance coverage through multiple accounts, up to $75,000 . Regulators consider reciprocal deposits to be brokered deposits. At December 31, 2016 , scheduled maturities of time deposits for the next five years with the weighted average rate at the end of the period were as follows: Balance Weighted Average Rate 2017 $ 992,786 0.73 % 2018 256,150 0.99 2019 29,019 0.98 2020 22,858 1.39 2021 and thereafter 67,091 1.65 Total $ 1,367,904 0.84 % At December 31, 2016 and 2015 , the Company's deposits included public funds totaling $1,001,820 and $708,723 , respectively. At December 31, 2016 and 2015 , overdrawn deposits of $340 and $1,177 were reclassified as unsecured consumer loans. Interest expense on deposits is summarized as follows: Years Ended December 31, 2016 2015 2014 Interest-bearing demand $ 3,974 $ 3,297 $ 1,653 Savings and money market 7,288 3,644 3,144 Time 9,772 6,186 3,415 Total $ 21,034 $ 13,127 $ 8,212

BORROWED FUNDS

BORROWED FUNDS	12 Months Ended
	Dec. 31, 2016
Debt Disclosure [Abstract]
BORROWED FUNDS	Borrowed Funds Borrowed funds are summarized as follows: December 31, 2016 2015 Amount Rate 1 Amount Rate 1 Federal Home Loan Bank advances $ 833,682 0.71 % $ 1,439,904 0.51 % Repurchase Agreements Credit Suisse structured repurchase agreement 25,000 3.02 25,000 3.22 Overnight repurchase agreements with depositors 61,691 0.15 58,269 0.16 Subordinated Debt Fixed to floating rate note maturing on December 1, 2025 125,000 5.58 75,000 5.50 Junior subordinated debentures 15,464 2.66 15,464 2.21 1 Rate at period-end, with the exception of the fixed to floating rate subordinated debt note, which is a weighted average rate calculated using period-end rates. Federal Home Loan Bank ("FHLB") Advances At December 31, 2016 , advances from the FHLB had interest rates ranging from 0.46% to 6.00% . At December 31, 2015 , advances from the FHLB had interest rates ranging from 0.28% to 6.00% . At December 31, 2016 , the Company had $800,000 in variable rate FHLB advances. In 2010, certain FHLB fixed-rate advances were modified. The early repayment of the debt resulted in a prepayment penalty, which is being amortized to interest expense as an adjustment to the cost of the new FHLB advances. The prepayment penalty, net of accumulated amortization, was $27 and $456 at December 31, 2016 and 2015 . The advances were collateralized by mortgage and commercial loans with FHLB collateral values of $1,877,506 and $1,461,248 under a blanket lien arrangement at December 31, 2016 and 2015 , respectively. Additionally, securities safekept at FHLB and FHLB stock are used as collateral for advances. Based on this collateral, the Company was eligible to borrow an additional $1,821,693 and $1,030,732 at December 31, 2016 and 2015 , respectively. The current agreement provided for a maximum borrowing amount of approximately $3,601,739 and $3,025,653 at December 31, 2016 and 2015 , respectively. Repurchase Agreements Repurchase agreements ("repos") which are classified as securities transactions, are not insured by the FDIC, are not guaranteed, and may lose value. A repo is an agreement between two parties whereby one party (a bank as counterparty) sells the other (as customer) a security at a specified price with a commitment to buy the security back at a fixed time and price. Repos are accounted for as collateralized borrowings and are recorded at amounts equal to cash received. Inherent in repurchase agreements is a risk that the fair value of the collateral pledged on the agreements could decline below the amount obligated under the agreements. To mitigate this risk to the customer, the Company, as the bank counterparty, marks securities sold under repos to fair value on a daily basis and provides 115% market value protection on overnight repos and 112% market value protection on its structured repo. In April 2008, the Company entered into a 10 -year term structured repurchase callable agreement for $25,000 to leverage the balance sheet and increase liquidity. The interest rate adjusts quarterly to 6.25% less the 90 day LIBOR, subject to a lifetime cap of 3.02% . At December 31, 2016 , the Company also had $61,691 in overnight repurchase agreements with depositors. Subordinated Debt In November 2015, the Company issued $75,000 of Fixed-to-Floating Rate Subordinated Notes (the “Notes”) that mature on December 1, 2025 (the “Maturity Date”). In September 2016, the Company issued an additional $50,000 of Notes that mature on the Maturity Date. The Notes, which qualify as Tier 2 capital for regulatory purposes, have an interest rate of 5.50% and 5.69% , respectively, per annum, payable semi-annually on each December 1 and June 1 through December 1, 2020. From and including December 1, 2020 through maturity or earlier redemption, the interest rate will reset quarterly to an interest rate per annum equal to the then current three-month LIBOR rate plus 3.89% , payable on March 1, June 1, September 1, and December 1 of each year through the maturity date or earlier redemption. The Company may, at its option, beginning on December 1, 2020 and on any scheduled interest payment date thereafter, redeem the Notes, in whole or in part, at a redemption price equal to 100% of the principal amount of the Notes to be redeemed plus accrued and unpaid interest to, but excluding, the date of redemption. Any partial redemption will be made pro rata among all of the holders. The Notes were sold at an underwriting discount and the discount, as well as debt issuance costs, are netted against the subordinated debt liability on the balance sheet in accordance with ASU 2015-03. The unamortized underwriting discount and debt issuance costs totaled $2,709 at December 31, 2016. The Notes are subordinated in right of payment to all of the Company's senior indebtedness and effectively subordinated to all existing and future debt and all other liabilities of the Company's subsidiaries. Upon the acquisition of LegacyTexas Group, Inc., the Company acquired $15,000 ( 15,000 shares with a liquidation amount of $1 per security) of Floating Rate Cumulative Trust Preferred Securities ("TruPS") and $464 of common stock through an unconsolidated subsidiary, Legacy Capital Trust III ("Trust III"). Trust III invested the total proceeds from the sale of TruPS and common stock (totaling $15,464 ) in floating rate Junior Subordinated Debentures (the "Trust III Debentures") issued by the Company. The terms of the Trust III Debentures are such that they qualify as Tier I capital for regulatory purposes. Interest on the Trust III Debentures is payable quarterly on March 15, June 15, September 15 and December 15 of each year, at a rate equal to the three month LIBOR rate plus 1.70% ( 2.66% at December 31, 2016 ). Principal is due at maturity on December 15, 2036. The TruPS are guaranteed by the Company and are subject to redemption. The Company may redeem the Trust III Debentures, in whole or in part, on any March 15, June 15, September 15 and December 15 at an amount equal to the principal amount being redeemed plus accrued and unpaid interest to the redemption date. At December 31, 2016 and 2015 , the Trust III Debentures were reduced by a purchase accounting fair value discount of $3,723 and $3,905 , respectively. Also upon the acquisition of LegacyTexas Group, Inc., the Company acquired $15,000 of TruPS and $464 of common stock through an unconsolidated subsidiary. The subsidiary invested the total proceeds from the sale of the TruPS and common stock in floating rate Junior Subordinated Debentures issued by LegacyTexas Group, Inc. On April 7, 2015, the Company paid this debt in full. Other Borrowing Information At December 31, 2016 , borrowed funds, reported gross of purchase accounting fair value discounts, prepayment penalties and debt issuance costs, were structured to contractually pay down as follows: FHLB Advances Repurchase Agreements Subordinated Debt Total 2017 $ 615,546 $ 61,691 $ — $ 677,237 2018 212,754 25,000 — 237,754 2019 2,314 — — 2,314 2020 931 — — 931 2021 856 — — 856 Thereafter 1,308 — 140,464 141,772 $ 833,709 $ 86,691 $ 140,464 $ 1,060,864 Upon the acquisition of LegacyTexas Group, Inc., the Company assumed long-term notes totaling $8,900 . These notes were paid off during the first quarter of 2015. At December 31, 2016 and 2015 , the Company had borrowing availability representing the collateral value assigned to the securities pledged to the discount window through the FRB of $46,725 and $35,632 , respectively. Additionally, uncommitted, unsecured Fed Fund lines of credit totaling $255,000 and $285,000 were available at December 31, 2016 and 2015 , respectively, from multiple correspondent banks.

BENEFITS

BENEFITS	12 Months Ended
	Dec. 31, 2016
Compensation and Retirement Disclosure [Abstract]
BENEFITS	Benefits Employee Stock Ownership (“ESOP”) and 401(k) Plan : The Company offers a KSOP plan composed of an ESOP and 401(k) plan. Employees may participate under the 401(k) portion of the KSOP as of the date they first complete an hour of service with the Bank. Employees are eligible to receive a matching contribution of 100% of employee contributions up to a maximum of 5% of the employee's qualifying compensation. Matching expense for 2016 , 2015 and 2014 was $2,479 , $2,130 and $1,283 , respectively. The ESOP portion of the KSOP was established in connection with the 2006 minority stock offering. In 2006 the ESOP purchased shares of common stock financed by a term loan from the Company. This note was fully repaid in September 2016, and all shares have been allocated to participant accounts. In 2010, the ESOP purchased 1,588,587 shares of common stock with proceeds from a 30 year note in the amount of $15,886 from the Company. The Company's Board of Directors determines the amount of contribution to the ESOP annually but is required to make contributions sufficient to service the ESOP's debt. Dividends on unallocated shares held by the ESOP are applied to the ESOP note payable. Shares are released for allocation to eligible employees as the ESOP debt is repaid. Eligible employees receive an allocation of released shares at the end of the calendar year on a relative compensation basis. Employees are eligible if they meet the minimum service and eligibility requirements. The dividends paid on allocated shares are paid to employee accounts. Contributions to the ESOP were $1,468 , $2,060 , and $2,060 during 2016 , 2015 and 2014 , and expense was $3,174 , $4,914 and $4,725 for December 31, 2016 , 2015 and 2014 , respectively. Shares held by the ESOP at December 31 are categorized as follows: 2016 2015 Allocated to participants 1,643,294 1,522,883 Unearned 1,245,046 1,365,457 Total ESOP shares 2,888,340 2,888,340 Fair value of unearned shares at December 31 $ 53,612 $ 34,164 Deferred Compensation Plan : The Company has entered into certain non-qualified deferred compensation agreements with members of the executive management team, directors and certain employees. These agreements, which are subject to the rules of section 409(a) of the Internal Revenue Code, relate to the voluntary deferral of compensation received and do not have an employer contribution. The accrued liability as of December 31, 2016 and 2015 was $3,344 and $4,086 , respectively. Included in other assets is a universal life insurance policy, as well as variable and fixed annuity contracts, totaling $3,534 and $4,272 at December 31, 2016 and 2015 , respectively. The Company is the owner and beneficiary of the policy, which pays interest on the funds invested. The life insurance policy is recorded at the net cash surrender value, or the amount that can be realized. Bank-Owned Life Insurance : The Company is the sole owner of life insurance policies pertaining to certain employees and directors. The selected insured employees and directors agreed to a share of the death benefit while they remain actively employed with the Company or serve on its board. In the event of death while actively employed with the Company, the employee's or director's designated beneficiary will receive an income tax free death benefit paid. The Company also is the sole owner of other life insurance policies that do not share the death benefit with the employees. The total balance of the bank-owned life insurance policies, reported as an asset, at December 31, 2016 and 2015 totaled $56,477 and $55,231 .

SHARE-BASED COMPENSATION

SHARE-BASED COMPENSATION	12 Months Ended
	Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
SHARE-BASED COMPENSATION	Share-based Compensation The Company has shareholder approved share-based compensation plans that are accounted for under ASC 718, Compensation - Stock Compensation , which requires companies to record compensation cost for share-based payment transactions with employees in return for employment service. Under the plans, options to purchase 3,370,040 shares of common stock and 1,348,016 restricted shares of common stock were made available. The plans allow for the Company to grant restricted stock, restricted stock units, stock options and stock appreciation rights to directors, advisory directors, officers and other employees. Shares issued in connection with stock compensation awards are issued from available authorized shares. Compensation cost charged to income for share-based compensation, which is reported in non-interest expense as salaries and employee benefits expense, is presented below: Years ended December 31, 2016 2015 2014 Restricted stock $ 3,477 $ 3,459 $ 2,561 Stock options 2,537 2,018 1,156 Income tax benefit 2,105 1,917 1,301 A summary of activity in the restricted stock portion of the Company's stock plans for 2016 , 2015 and 2014 is presented below: Time-Based Shares Performance-Based Shares Shares Weighted- Average Grant Date Fair Value 1 Shares Weighted- Average Grant Date Fair Value 2 Non-vested at January 1, 2014 381,402 $ 20.39 82,400 $ 27.45 Granted 20,000 24.69 — — Vested (103,799 ) 20.32 — — Non-vested at December 31, 2014 297,603 20.45 82,400 23.89 Granted 80,000 21.23 — — Vested (131,142 ) 19.98 (20,600 ) 23.89 Non-vested at December 31, 2015 246,461 20.98 61,800 25.02 Granted 55,180 29.29 40,200 29.29 Vested (101,465 ) 20.70 (20,600 ) 25.02 Non-vested at December 31, 2016 200,176 $ 23.79 81,400 $ 43.06 1 For restricted stock awards with time-based vesting conditions, the grant date fair value is based upon the closing stock price as quoted on the NASDAQ Stock Market on the grant date. 2 For restricted stock awards with performance-based vesting conditions, the value of the award is based upon the closing stock price as quoted on the NASDAQ Stock Market on the date of vesting. Until the final value is determined on the vesting date, the Company estimates the fair value quarterly based upon the closing stock price as quoted on the NASDAQ Stock Market near the last business day of each calendar quarter end. As of December 31, 2016 , there was $5,398 of total unrecognized compensation expense related to non-vested restricted shares awarded under the Company's stock plans. That expense is expected to be recognized over a weighted-average period of 1.40 years. The total fair value of shares vested during the years ended December 31, 2016 and 2015 , was $2,615 and $3,113 , respectively. Total restricted shares available for future issuance under the plans totaled 64,009 at December 31, 2016 with 1,409,004 shares having been issued under the plans through December 31, 2016 . Under the terms of the plans, stock options may not be granted with an exercise price less than the fair market value of the Company’s common stock on the date the option is granted and may not be exercised later than ten years after the grant date. The fair market value is the closing stock price as quoted on the NASDAQ Stock Market on the date of grant. The fair value of each option award is estimated on the date of grant using a closed form option valuation (Black-Scholes) model that uses the assumptions noted in the table below. The risk-free interest rate is the implied yield available on U.S. Treasury zero-coupon issues with a remaining term equal to the expected term of the stock option in effect at the time of the grant. Although the contractual term of the stock options granted is ten years, the expected term of the stock is less because option restrictions do not permit recipients to sell or hedge their options and therefore, we believe, encourage exercise of the options before the end of the contractual term. The expected term of stock options is based on employees' actual vesting behavior and expected volatilities are based on historical volatilities of the Company’s common stock. Expected dividends are the estimated dividend rate over the expected term of the stock options. For awards with performance-based vesting conditions, compensation cost is recognized when the achievement of the performance condition is considered probable of achievement. If a performance condition is subsequently determined to be improbable of achievement, compensation cost is reversed. The weighted average fair value of stock options granted during 2016 , 2015 and 2014 was $7.77 , $6.82 and $7.17 , respectively. The fair value of options granted was determined using the following weighted-average assumptions as of grant date: 2016 2015 2014 Risk-free interest rate 1.37 % 1.80 % 2.16 % Expected term of stock options (years) 6.3 6.2 6.2 Expected stock price volatility 32.07 % 31.14 % 30.96 % Expected dividends 1.93 % 1.95 % 1.84 % A summary of activity in the stock option portion of the Company's share-based compensation plans as of the years ended December 31, 2016 , 2015 and 2014 is presented below: Options Shares Weighted- Average Exercise Price Weighted- Average Remaining Contractual Term Aggregate Intrinsic Value Outstanding at January 1, 2014 1,173,618 $ 18.16 8.4 $ 10,903 Granted 328,750 26.09 10.0 — Exercised (56,035 ) 13.66 — 652 Forfeited (75,460 ) 17.63 — — Outstanding at December 31, 2014 1,370,873 20.27 8.0 5,679 Granted 633,000 25.66 10.0 — Exercised (58,855 ) 16.12 — 644 Forfeited (79,268 ) 20.89 — — Outstanding at December 31, 2015 1,865,750 22.21 7.9 6,401 Granted 392,838 29.15 10.0 — Exercised (175,192 ) 19.08 — 2,251 Forfeited (75,316 ) 25.57 — — Outstanding at December 31, 2016 2,008,080 $ 23.71 7.4 $ 38,850 Fully vested and expected to vest 1,990,524 $ 23.68 7.4 $ 38,585 Exercisable at December 31, 2016 719,156 $ 20.51 6.2 $ 16,218 As of December 31, 2016 , there was $7,091 of total unrecognized compensation expense related to non-vested stock options. That expense is expected to be recognized over a weighted-average period of 2.45 years . At December 31, 2016 , the Company applied an estimated forfeiture rate of 5% based on historical activity. The intrinsic value for stock options is calculated based on the difference between the exercise price of the underlying awards and the market price of our common stock as of the reporting date.

INCOME TAXES

INCOME TAXES	12 Months Ended
	Dec. 31, 2016
Income Tax Disclosure [Abstract]
INCOME TAXES	Income Taxes The Company's pre-tax income is subject to federal income tax and state margin tax at a combined rate of 36% for 2016 , 2015 and 2014 . Income tax expense for 2016 , 2015 and 2014 , was as follows: 2016 2015 2014 Current expense $ 59,900 $ 38,648 $ 19,073 Deferred expense (6,798 ) (692 ) (1,414 ) Total income tax expense $ 53,102 $ 37,956 $ 17,659 At December 31, 2016 and 2015 , deferred tax assets and liabilities were due to the following: December 31, 2016 2015 Deferred tax assets: Allowance for loan losses $ 22,602 $ 16,483 Deferred compensation arrangements 1,261 1,536 Self-funded health insurance 241 203 Non-accrual interest 966 632 Restricted stock and stock options 3,132 2,275 Accrued expenses 1,255 715 Fair value mark on purchased loans 2,348 3,838 Net unrealized loss on securities available for sale 1,465 72 Other 2,121 811 35,391 26,565 Deferred tax liabilities: Depreciation (336 ) (1,011 ) Partnerships — CRA-purposed private equity funds (1,697 ) (1,328 ) Fair value mark on subordinated debt (1,303 ) (1,367 ) Other (2,824 ) (1,819 ) (6,160 ) (5,525 ) Net deferred tax asset $ 29,231 $ 21,040 The net deferred tax asset is recorded on the consolidated balance sheets under “other assets.” Management performed an analysis related to the Company's deferred tax asset for each of the years ended December 31, 2016 and 2015 and, based upon these analyses, no valuation allowance was deemed necessary as of December 31, 2016 or 2015 . Effective tax rates differ from the federal statutory rate of 35% in 2016 , 2015 and 2014 , applied to income before income taxes due to the following: At and for the Year Ended December 31, 2016 2015 2014 Federal statutory rate times financial statement income $ 52,823 $ 38,105 $ 17,128 Effect of: State taxes, net of federal benefit 267 37 66 Tax credit on CRA-purposed private equity fund — — (58 ) Bank-owned life insurance income (436 ) (419 ) (220 ) Municipal interest income (1,041 ) (1,025 ) (772 ) ESOP shares released 757 1,207 1,140 One-time merger expenses — — 381 Sale of LegacyTexas Insurance Services, Inc. 640 — — Other 92 51 (6 ) Total income tax expense $ 53,102 $ 37,956 $ 17,659 Effective Tax Rate 35.18 % 34.86 % 36.09 % The Company files income tax returns in the U.S. federal jurisdiction and several U.S. state jurisdictions. The Company is generally no longer subject to U.S. federal income tax examinations for tax years prior to 2013.

RELATED PARTY TRANSACTIONS

RELATED PARTY TRANSACTIONS	12 Months Ended
	Dec. 31, 2016
Related Party Transactions [Abstract]
RELATED PARTY TRANSACTIONS	Related Party Transactions Loans to executive officers, directors, and their affiliates during 2016 were as follows: Balance Beginning balance $ 15,365 New loans 21 Effect of changes in composition of related parties — Repayments (49 ) Ending balance $ 15,337 None of the above loans were considered non-performing or potential problem loans. These loans are made in the ordinary course of business and on substantially the same terms, including interest rates and collateral, as those prevailing at the time for comparable transactions with other unaffiliated persons and do not involve more than normal risk of collectability. Deposits from executive officers, directors, and their affiliates at December 31, 2016 and 2015 were $48,761 and $44,907 , respectively.

REGULATORY CAPITAL MATTERS

REGULATORY CAPITAL MATTERS	12 Months Ended
	Dec. 31, 2016
Regulatory Capital Requirements [Abstract]
REGULATORY CAPITAL MATTERS	Regulatory Capital Matters Banks and bank holding companies are subject to regulatory capital requirements administered by federal banking agencies. Capital adequacy guidelines and, additionally for banks, prompt corrective action regulations, involve quantitative measures of assets, liabilities, and certain off‑balance sheet items calculated under regulatory accounting practices. Capital amounts and classifications are also subject to qualitative judgments by regulators. Failure to meet capital requirements can initiate regulatory action. The Bank and the Company are regulated by the Texas Department of Banking ("TDOB") and the Board of Governors of the Federal Reserve System ("FRB"). The ability of a subsidiary bank to pay dividends depends on its earnings and capital levels and may be limited by their regulator's directives or orders. A bank generally must obtain regulatory approval of a dividend if the total dividends declared during the current year, including the proposed dividend, exceed net income for the current year and retained net income for the prior two years. Prompt corrective action regulations provide five classifications: well-capitalized, adequately capitalized, undercapitalized, significantly undercapitalized and critically undercapitalized, although these terms are not used to represent overall financial condition. If an institution is adequately capitalized, regulatory approval is required to accept brokered deposits. If an institution is undercapitalized, capital distributions are limited, as is asset growth and expansion, and capital restoration plans are required. At December 31, 2016 and 2015 , the most recent regulatory notification categorized the Bank and the Company as well-capitalized under the regulatory framework for prompt corrective action. There are no conditions or events since that notification that management believes have changed the institution's category. Management believes that, at December 31, 2016 , the Bank and the Company met all capital adequacy requirements to which they were subject. Actual Required for Capital Adequacy Purposes To Be Well-Capitalized Amount Ratio Amount Ratio Amount Ratio As of December 31, 2016 Total risk-based capital the Company $ 910,040 11.71 % $ 621,870 8.00 % $ 777,338 10.00 % the Bank 869,523 11.19 621,840 8.00 777,300 10.00 Tier 1 risk-based capital the Company 721,600 9.28 466,403 6.00 466,403 6.00 the Bank 803,374 10.34 466,380 6.00 621,840 8.00 Common equity tier 1 risk-based capital the Company 709,858 9.13 349,802 4.50 n/a 1 n/a 1 the Bank 803,374 10.34 349,785 4.50 505,245 6.50 Tier 1 leverage the Company 721,600 8.73 330,782 4.00 n/a 1 n/a 1 the Bank 803,374 9.71 330,873 4.00 413,591 5.00 As of December 31, 2015 Total risk-based capital the Company $ 755,689 11.58 % $ 522,107 8.00 % $ 652,634 10.00 % the Bank 691,554 10.60 522,116 8.00 652,645 10.00 Tier 1 risk-based capital the Company 635,162 9.73 391,580 6.00 391,580 6.00 the Bank 644,461 9.87 391,587 6.00 522,116 8.00 Common equity tier 1 risk-based capital the Company 623,604 9.56 293,685 4.50 n/a 1 n/a 1 the Bank 644,461 9.87 293,690 4.50 424,219 6.50 Tier 1 leverage the Company 635,162 9.46 268,430 4.00 n/a 1 n/a 1 the Bank 644,461 9.61 268,273 4.00 335,341 5.00 1 Not applicable

COMMITMENTS AND CONTINGENT LIAB

COMMITMENTS AND CONTINGENT LIABILITIES	12 Months Ended
	Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENT LIABILITIES	Note 17 - Commitments and Contingent Liabilities In the normal course of business, the Company enters into various transactions which, in accordance with US GAAP, are not included in its consolidated balance sheets. The Company enters into these transactions to meet the financing needs of its customers. These transactions include commitments to extend credit and standby letters of credit which involve, to varying degrees, elements of credit and interest rate risk. Credit losses up to the face amount of these instruments could occur, although material losses are not anticipated. The Company's credit policies applied to loan originations are also applied to these commitment requests, including obtaining collateral at the exercise of the commitment. The contractual amounts of financial instruments with off‑balance sheet risk at December 31, 2016 and 2015 , are summarized below. Please see Part II-Item 7- "Off-Balance Sheet Arrangements, Contractual Obligation and Commitments" of this Form 10-K for information related to commitment maturities. December 31, 2016 2015 Unused commitments to extend credit $ 1,642,528 $ 1,211,964 Unused capacity on Warehouse Purchase Program loans 892,659 476,281 Standby letters of credit 29,198 18,644 Total unused commitments/capacity $ 2,564,385 $ 1,706,889 Unused commitments to extend credit - The Company enters into contractual commitments to extend credit, normally with fixed expiration dates or termination clauses, at specified rates and for specific purposes. Since many commitments expire without being drawn upon, the total contractual amount of commitments does not necessarily represent future cash requirements of the Company. Substantially all of the Company's commitments to extend credit are contingent upon customers maintaining specific credit standards at the time of future loan funding. Unused capacity on Warehouse Purchase Program loans - In regard to unused capacity on Warehouse Purchase Program loans, the Company has established maximum purchase facility amounts, but reserves the right, at any time, to refuse to buy any mortgage loans offered for sale by each customer, for any reason in the Company's sole and absolute discretion. Standby letters of credit - Standby letters of credit are conditional commitments issued by the Company to guarantee the performance of a customer to a third party. The credit risk involved in issuing letters of credit is essentially the same as that involved in extending loan facilities to customers. In addition to the commitments above, the Company guarantees the credit card debt of certain customers to the merchant bank that issues the credit cards. These guarantees are in place for as long as the guaranteed credit card is open. At December 31, 2016 and 2015 , these credit card guarantees totaled $3,335 and $1,028 , respectively. This amount represents the maximum potential amount of future payments under the guarantee, which the Company is responsible for in the event of customer non-payment. In the third quarter of 2016, the Company established an allowance for credit losses on off-balance sheet lending-related commitments through a charge to provision for credit losses on the Company's consolidated statement of income. The establishment of this allowance for credit losses on off-balance sheet lending-related commitments was due to the expansion of the Company's lending business, as well as recent increased diversification of the types of off-balance sheet commitments offered by the Company. At December 31, 2016 , this allowance for credit losses on off-balance sheet lending-related commitments, included in "other liabilities" on the Company's consolidated balance sheets, totaled $1,500 . Because business processes and credit risks associated with unfunded credit commitments are essentially the same as for loans, the company utilizes similar processes to estimate its liability for unfunded credit commitments. In addition to the commitments above, the Company had overdraft protection available in the amounts of $85,709 and $87,077 at December 31, 2016 and 2015 , respectively. The Company, at December 31, 2016 , had FHLB letters of credit of $946,338 pledged to secure public deposits, repurchase agreements, and for other purposes required or permitted by law. At December 31, 2016 , the Company had $2,080 of unfunded commitments recorded in other liabilities in its consolidated balance sheet related to investments in community development-oriented private equity funds used for Community Reinvestment Act purposes. The total investment in these equity funds was $11,168 , with an average ownership of 5.3% . Liability for Mortgage Loan Repurchase Losses Residential mortgage loans are sold in the secondary market with standard representations and warranties regarding certain characteristics such as the quality of the loan, the absence of fraud, the eligibility of the loan for sale and the future servicing associated with the loan. The Company may be required to repurchase these loans at par, or make-whole or indemnify the purchasers for losses incurred when representations and warranties are breached. The company maintains a repurchase liability related to residential mortgage loans sold with representations and warranty provisions. This repurchase liability is reported in other liabilities on the consolidated balance sheets and reflects management’s estimate of losses based on historical repurchase and loss trends, as well as other factors that may result in anticipated losses different from historical loss trends. Adjustments to this reserve are recorded in other non-interest expense on the consolidated statements of income. The liability was $143 and $147 at December 31, 2016 and 2015 , respectively.

PARENT COMPANY ONLY CONDENSED F

PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION	12 Months Ended
	Dec. 31, 2016
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION	Parent Company Only Condensed Financial Information Condensed financial information of the Company is as follows: CONDENSED BALANCE SHEETS December 31, 2016 2015 ASSETS Cash on deposit at subsidiary $ 16,962 $ 42,980 Investment in banking subsidiary 978,880 824,933 Receivable from banking subsidiary 10,317 7,456 ESOP note receivable and other assets 13,999 14,498 Total assets $ 1,020,158 $ 889,867 LIABILITIES AND SHAREHOLDERS’ EQUITY Borrowings $ 134,032 $ 84,992 Other liabilities 761 799 Shareholders’ equity 885,365 804,076 Total liabilities and shareholders’ equity $ 1,020,158 $ 889,867 CONDENSED STATEMENTS OF INCOME December 31, 2016 2015 2014 Cash dividends from subsidiary $ — $ 24,500 $ 19,187 Excess of earnings over dividend from subsidiary 103,572 48,677 20,044 Interest income on ESOP loan 487 565 633 Interest income on subordinated debt 11 17 — Other income — 5 — 104,070 73,764 39,864 Interest expense 6,040 1,046 — Operating expenses 3,236 3,009 13,036 Earnings before income tax benefit 94,794 69,709 26,828 Income tax benefit 3,027 1,207 4,450 Net income $ 97,821 $ 70,916 $ 31,278 CONDENSED STATEMENTS OF CASH FLOWS December 31, 2016 2015 2014 Cash flows from operating activities Net income $ 97,821 $ 70,916 $ 31,278 Adjustments to reconcile net income to net cash from operating activities: Excess of earnings over dividend from subsidiary (103,572 ) (48,677 ) (20,044 ) Amortization 530 171 — Activity in share-based compensation plans 3,152 3,068 3,096 Net change in intercompany receivable — — (31,395 ) Net change in other assets (481 ) 6,931 (1,820 ) Net change in other liabilities (38 ) (14,544 ) 4,134 Net cash provided by (used in) operating activities (2,588 ) 17,865 (14,751 ) Cash flows from investing activities Capital contribution (to) from subsidiary (49,000 ) (40,000 ) 31,395 Cash and cash equivalents acquired from LegacyTexas Group, Inc. — 201 — Payments received on ESOP notes receivable 981 1,495 1,427 Net cash provided by (used in) investing activities (48,019 ) (38,304 ) 32,822 Cash flows from financing activities Proceeds from borrowings 73,439 73,407 — Repayments of borrowings (24,929 ) (24,364 ) — Share repurchase — (7,989 ) — Net issuance of common stock under employee stock plans 3,755 1,284 1,085 Payment of dividends (27,676 ) (25,747 ) (19,187 ) Net cash provided by (used in) financing activities 24,589 16,591 (18,102 ) Net change in cash and cash equivalents (26,018 ) (3,848 ) (31 ) Beginning cash and cash equivalents 42,980 46,828 46,859 Ending cash and cash equivalents $ 16,962 $ 42,980 $ 46,828

QUARTERLY FINANCIAL DATA (Unaud

QUARTERLY FINANCIAL DATA (Unaudited)	12 Months Ended
	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
QUARTERLY FINANCIAL DATA (Unaudited)	Quarterly Financial Data (Unaudited) Net Interest Income Provision Securities Gains and (Losses) Earnings per Share Interest Income Interest Expense Net Income Basic Diluted 2016 First quarter $ 72,608 $ 7,257 $ 65,351 $ 8,800 $ — $ 22,082 0.48 0.48 Second quarter 77,336 7,982 69,354 6,800 65 23,217 0.50 0.50 Third quarter 82,911 9,431 73,480 3,467 (3 ) 27,217 0.59 0.58 Fourth quarter 84,497 10,413 74,084 7,833 (6 ) 25,305 0.54 0.54 2015 First quarter $ 61,618 $ 5,292 $ 56,326 $ 3,000 $ 211 $ 16,324 0.35 0.35 Second quarter 64,967 5,146 59,821 3,750 — 20,251 0.44 0.44 Third quarter 66,525 5,337 61,188 7,515 (25 ) 17,895 0.39 0.38 Fourth quarter 69,582 5,840 63,742 11,200 17 16,446 0.36 0.35

SUBSEQUENT EVENTS

SUBSEQUENT EVENTS	12 Months Ended
	Dec. 31, 2016
Subsequent Events [Abstract]
SUBSEQUENT EVENTS	Subsequent Events The Company evaluated events from the date of the consolidated financial statements on December 31, 2016 through the issuance of those consolidated financial statements included in this Annual Report on Form 10-K dated February 9, 2017 .

SUMMARY OF SIGNIFICANT ACCOUN29

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - (Policies)	12 Months Ended
	Dec. 31, 2016
Accounting Policies [Abstract]
Principles of Consolidation	Nature of Operations and Principles of Consolidation : The consolidated financial statements include LegacyTexas Financial Group, Inc. (the "Company"), whose business at December 31, 2016 primarily consisted of the operations of its wholly-owned subsidiary, LegacyTexas Bank (the "Bank"). In addition, the Company also offers title services through LegacyTexas Title Co., which is a wholly-owned subsidiary of the Bank. Intercompany transactions and balances are eliminated in consolidation.
Use of Estimates	Use of Estimates : To prepare financial statements in conformity with U.S. generally accepted accounting principles ("US GAAP"), management makes estimates and assumptions based on available information. These estimates and assumptions affect the amounts reported in the financial statements and the disclosures provided, and actual results could differ. The allowance for loan losses, valuation of other real estate owned, other-than-temporary impairment of securities, realization of deferred tax assets, and fair values of financial instruments are subject to change.
Cash Flows	Cash Flows : Cash and cash equivalents include cash, deposits with other financial institutions with maturities less than 90 days, and federal funds sold. Net cash flows are reported for customer loan and deposit transactions, interest-bearing deposits in other financial institutions, federal funds purchased, Federal Home Loan Bank advances and repurchase agreements.
Restrictions on Cash	Restrictions on Cash : The Company maintains deposits with other financial institutions in amounts that exceed federal deposit insurance coverage. Management regularly evaluates the credit risk associated with the counterparties to these transactions and believes that the Company is not exposed to any significant credit risks on cash and cash equivalents. Cash balances equaling or exceeding escrow amounts are maintained at correspondent banks.
Securities	Securities : Securities that the Company has both the positive intent and ability to hold to maturity are classified as held to maturity and are carried at amortized cost. Securities that the Company intends to hold for an indefinite period of time, but not necessarily to maturity, are classified as available for sale and are carried at fair value. Unrealized gains and losses on securities classified as available for sale have been accounted for as accumulated other comprehensive income (loss), net of taxes. Gains and losses on the sale of securities classified as available for sale are recorded on the trade date using the specific-identification method. Amortization of premiums and discounts are recognized in interest income over the period to maturity. Premiums and discounts on securities are amortized using the level-yield method without anticipating prepayment, except for mortgage-backed securities where prepayments are anticipated.
Other-than-Temporary Impairment	The Company evaluates securities for other-than-temporary impairment on at least a quarterly basis and more frequently when economic, market, or security specific concerns warrant such evaluation. Consideration is given to the length of time and the extent to which the fair value has been less than amortized cost, the financial condition and near-term prospects of the issuer, and the intent and ability of the Company to retain its investment for a period of time sufficient to allow for any anticipated recovery in fair value. In analyzing an issuer’s financial condition, the Company may consider whether the securities are issued by the federal government or its agencies, whether downgrades by bond rating agencies have occurred, and the results of reviews of the issuers’ financial condition. The Company conducts regular reviews of the bond agency ratings of securities and considers whether the securities were issued by or have principal and interest payments guaranteed by the federal government or its agencies. These reviews focus on the underlying rating of the issuer and also include the insurance rating of securities that have an insurance component or guarantee. The ratings and financial condition of the issuers are monitored, as well as the financial condition and ratings of the insurers and guarantors. For periods in which other-than-temporary impairment of a debt security is recognized, the credit portion of the amount is determined by subtracting the present value of the stream of estimated cash flows as calculated in a discounted cash flow model and discounted at book yield from the prior period’s ending carrying value. The non-credit portion of the amount is determined by subtracting the credit portion of the impairment from the difference between the book value and fair value of the security. The credit related portion of the impairment is charged against income and the non-credit related portion is charged to equity as a component of accumulated other comprehensive income.
Mortgage loans held for sale	Mortgage Loans Held for Sale : The Company elects the fair value option for recording residential mortgage loans held for sale in accordance with Accounting Standards Codification ("ASC") 825, "Financial Instruments". This election allows for a more effective offset of the changes in fair values of the loans and the derivative instruments used to economically hedge them without the burden of complying with the requirements for hedge accounting under ASC 815, “Derivatives and Hedging.”
Loans	Warehouse Purchase Program Loans : The Warehouse Purchase Program allows unaffiliated mortgage originators to close one-to-four family real estate loans in their own name and manage its cash flow needs until the loans are sold to investors. The mortgage banking company customer closes mortgage loans consistent with underwriting standards established by the Bank and approved investors and, once all pertinent documents are received, the participation interest is delivered by the Bank to the investor selected by the originator and approved by us. Although not bound by any legally binding commitment, when a purchase decision is made, we purchase a 100% participation interest in the mortgage loans originated by our mortgage banking company customers. All Warehouse Purchase Program loans are collectively evaluated for impairment and are purchased under several contractual requirements, providing safeguards to the Company. These safeguards include the requirement that our mortgage company customers have a takeout commitment or similar arrangement for each loan. To date, the Company has not experienced a loss on these loans and no allowance for loan losses has been allocated to them. Loans : Loans that management has the intent and ability to hold for the foreseeable future or until maturity or payoff are reported at the principal balance outstanding, net of unearned interest, purchase premiums and discounts, deferred loan fees and costs, and an allowance for loan losses. Interest income is accrued on the unpaid principal balance. Loan origination fees, net of certain direct origination costs, are deferred and recognized in interest income using the level-yield method without anticipating prepayments. Past due status is based on the contractual terms of the loan. Loans that are past due 30 days are considered delinquent. Interest income on loans is discontinued at the time the loan is 90 days delinquent unless the loan is well-secured and in process of collection. Non-mortgage consumer loans are typically charged off no later than 120 days past due. In all cases, loans are placed on nonaccrual or charged-off at an earlier date if collection of principal or interest is considered doubtful. Nonaccrual loans include both smaller balance homogeneous loans that are collectively evaluated for impairment and larger individually classified impaired loans. All interest accrued but not received for loans placed on nonaccrual status is reversed against interest income. Subsequent receipts on non-accrual loans are recorded as a reduction of principal, and interest income is recorded only after principal recovery is reasonably assured. Loans are returned to accrual status when all the principal and interest amounts contractually due are brought current and future payments are reasonably assured. For loans collateralized by real property and commercial and industrial loans, credit exposure is monitored by internally assigned grades used for classification of loans. A loan is considered “special mention” when management has determined that there is a potential weakness that deserves management's close attention. Loans rated as "special mention" are not adversely classified according to regulatory classifications and do not expose the Company to sufficient risk to warrant adverse classification. A loan is considered “substandard” if it is inadequately protected by the current net worth and paying capacity of the obligor or the collateral pledged, if any. “Substandard” loans include those characterized by the “distinct possibility” that the insured institution will sustain “some loss” if the deficiencies are not corrected, and the loan may or may not meet the criteria for impairment. Loans classified as “doubtful” have all of the weaknesses of those classified as “substandard”, with the added characteristic that the weaknesses present make “collection or liquidation in full,” on the basis of currently existing facts, conditions and values, “highly questionable and improbable.” All other loans that do not fall into the above mentioned categories are considered “pass” loans. Updates to internally assigned grades are made monthly and/or upon significant developments. For other consumer loans (non-real estate), credit exposure is monitored by payment history of the loans. Non-performing other consumer loans are on nonaccrual status and are generally greater than 90 days past due.
Acquired Loans	Acquired Loans : Loans acquired through the completion of a transfer, including loans acquired in a business combination, that have evidence of deterioration of credit quality since origination and for which it is probable, at acquisition, that the Company will be unable to collect all contractually required payment receivable are initially recorded at fair value (as determined by the present value of expected future cash flows) with no valuation allowance. The difference between the undiscounted cash flows expected at acquisition and the investment in the loan, or the “accretable yield,” is recognized as interest income on a level-yield method over the life of the loan. Contractually required payments for interest and principal that exceed the undiscounted cash flows expected at acquisition, or the “nonaccretable difference,” are not recognized on the balance sheet and do not result in any yield adjustments, loss accruals or valuation allowances. Increases in expected cash flows, including prepayments, subsequent to the initial investment are recognized prospectively through adjustment of the yield on the loan over its remaining life. Decreases in expected cash flows are recognized as impairment. Valuation allowances on these impaired loans reflect only losses incurred after the acquisition (meaning the present value of all cash flows expected at acquisition that ultimately are not to be received). Revolving loans, including lines of credit, are excluded from acquired credit impaired loan accounting. For acquired loans not deemed credit-impaired at acquisition, the differences between the initial fair value and the unpaid principal balance are recognized as interest income on a level-yield basis over the lives of the related loans. Subsequent to the acquisition date, methods utilized to estimate the required allowance for loan losses for these loans is similar to originated loans; however, a provision for credit losses will be recorded only to the extent the required allowance exceeds any remaining credit discounts.
Concentration of Credit Risk	Concentration of Credit Risk : Most of the Company’s business activity is with customers located within the North Texas region and a large portion of loans are secured by real estate in this area. Therefore, the Company’s exposure to credit risk is significantly affected by changes in the economy of the North Texas area.
Allowance for Loan Losses	Allowance for Loan Losses : The allowance for loan losses and related provision expense are susceptible to change if the credit quality of our loan portfolio changes, which is evidenced by many factors, including but not limited to charge-offs and non-performing loan trends. Generally, consumer real estate lending has a lower credit risk profile compared to other consumer lending (such as automobile loans). Commercial real estate and commercial and industrial lending, however, can have higher risk profiles than consumer loans due to these loans being larger in amount and non-homogeneous in structure and term. Changes in economic conditions, the mix and size of the loan portfolio, and individual borrower conditions can dramatically impact our level of allowance for loan losses in relatively short periods of time. The allowance for loan losses is maintained to cover incurred losses that are estimated in accordance with US GAAP. It is our estimate of credit losses inherent in our loan portfolio at each balance sheet date. Our methodology for analyzing the allowance for loan losses consists of general and specific components. For the general component, we stratify the loan portfolio into homogeneous groups of loans that possess similar loss potential characteristics and apply a loss ratio to these groups of loans to estimate the credit losses in the loan portfolio. We use both historical loss ratios and qualitative loss factors assigned to major loan collateral types to establish general component loss allocations, inclusive of estimated loss emergence periods. Qualitative loss factors are based on management's judgment of company, market, industry or business specific data and external economic indicators, which are not yet reflected in the historical loss ratios, and that could impact the Company's specific loan portfolios. The Allowance for Loan Loss Committee sets and adjusts qualitative loss factors by regularly reviewing changes in underlying loan composition and the seasonality of specific portfolios. The Allowance for Loan Loss Committee also considers credit quality and trends relating to delinquency, non-performing and adversely rated loans within the Company's loan portfolio when evaluating qualitative loss factors. Additionally, the Allowance for Loan Loss Committee adjusts qualitative factors to account for the potential impact of external economic factors, including the unemployment rate, vacancy and capitalization rates and other pertinent economic data specific to our primary market area and lending portfolios. For the specific component, the allowance for loan losses includes loans where management has concerns about the borrower's ability to repay and on individually analyzed loans found to be impaired. Management evaluates current information and events regarding a borrower's ability to repay its obligations and considers a loan to be impaired when the ultimate collectability of amounts due, according to the contractual terms of the loan agreement, is in doubt. If an impaired loan is collateral-dependent, the fair value of the collateral, less the estimated cost to sell, is used to determine the amount of impairment. If an impaired loan is not collateral-dependent, the impairment amount is determined using the negative difference, if any, between the estimated discounted cash flows and the loan amount due. For impaired loans, the amount of the impairment can be adjusted, based on current data, until such time as the actual basis is established by acquisition of the collateral or until the basis is collected. Impairment losses are reflected in the allowance for loan losses through a charge to the provision for credit losses. Subsequent recoveries are credited to the allowance for loan losses. Cash receipts for accruing loans are applied to principal and interest under the contractual terms of the loan agreement. Cash receipts on impaired loans for which the accrual of interest has been discontinued are applied first to principal. Large groups of smaller-balance homogeneous loans are collectively evaluated for impairment. As a result, the Company does not separately identify consumer real estate loans less than $417 or individual consumer non-real estate secured loans for impairment disclosures. The Company considers these loans to be homogeneous in nature due to the smaller dollar amount and the similar underwriting criteria. A loan that has been modified is considered a troubled debt restructuring (“TDR”) when two conditions are met: 1) the borrower is experiencing financial difficulty and 2) concessions are made for the borrower's benefit that would not otherwise be considered for a borrower or transaction with similar credit risk characteristics. Modifications to loan terms may include a modification of the contractual interest rate to a below-market rate (even if the modified rate is higher than the original rate), forgiveness of accrued interest, forgiveness of a portion of principal, an extended repayment period or a deed in lieu of foreclosure or other transfer of assets other than cash to fully or partially satisfy a debt. The Company's policy is to place all TDRs on nonaccrual for a minimum period of six months . Loans qualify for return to accrual status once they have demonstrated performance with the restructured terms of the loan agreement for a minimum of six months and the collection of principal and interest under the revised terms is deemed probable. All TDRs are considered to be impaired loans.
Federal Home Loan Bank stock and other restricted securities	FHLB stock and other restricted securities: FHLB, FRB and other restricted stock is carried at cost, classified as restricted securities and periodically evaluated for impairment based on the ultimate recoverability of the par value. Both cash and stock dividends are reported as interest income.
Bank-Owned Life Insurance	Bank-Owned Life Insurance : The Company has purchased life insurance policies on certain key employees. The purchase of these life insurance policies allows the Company to use tax-advantaged rates of return. Bank-owned life insurance is recorded at the amount that can be realized under the insurance contract at the balance sheet date, which is the cash surrender value adjusted for other charges or other amounts due that are probable at settlement.
Premises and Equipment	Premises and Equipment : Land is carried at cost. Premises and equipment are stated at cost less accumulated depreciation. Buildings and related components are generally depreciated using the straight-line method with useful lives ranging from 10 to 30 years. Furniture, fixtures and equipment are generally depreciated using the straight-line method with useful lives ranging from 3 to 7 years. The cost of leasehold improvements is amortized over the shorter of the lease term or useful life using the straight-line method.
Goodwill	Goodwill : Goodwill represents the excess of the cost of businesses acquired over the fair value of the net assets acquired. According to ASC 350-20, "Intangibles- Goodwill and Other", goodwill shall be tested for impairment between annual tests if an event occurs or circumstances change that would more likely than not reduce the fair value below its carrying amount. Deterioration in economic market conditions, changes in key personnel, increased estimates of the effects of recent regulatory or legislative changes, or additional regulatory or legislative changes may result in declines in projected business performance beyond management's current expectations. Such declines in business performance could cause the estimated fair value of goodwill to decline, which could result in an impairment charge to earnings in a future period related to goodwill. The Company evaluates goodwill for impairment on an annual basis or on an interim basis if an event occurs or circumstances change that would more likely than not reduce the fair value below its carrying amount, in accordance with ASC 350-20. During 2016, the Company changed its annual goodwill impairment testing date from December 31 to October 1. The Company believes that this new date is preferable as it provides additional time prior to the Company’s year-end to complete the annual goodwill impairment test, especially in the event of future acquisitions and growth. This change does not accelerate, delay, avoid or cause an impairment charge, nor does this change result in adjustments to previously issued financial statements. The Company first assesses qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount as a basis for determining the need to perform the two-step test for goodwill impairment (the qualitative method). If the qualitative method cannot be used or if it determines, based on the qualified method, that the fair value is more likely than not less than the carrying amount, the Company uses the two-step test. Under the two-step test, the Company compares the estimated fair value of a reporting unit with its carrying amount, including goodwill. If the estimated fair value of a reporting unit exceeds its carrying amount, goodwill of the reporting unit is considered not impaired. If the carrying amount of a reporting unit exceeds its estimated fair value, the second step of the goodwill impairment test is performed to measure the amount of impairment loss, if any. Step two of the goodwill impairment test compares the implied estimated fair value of reporting unit goodwill with the carrying amount of that goodwill. If the carrying amount of goodwill for that reporting unit exceeds the implied fair value of that unit's goodwill, an impairment loss is recognized in an amount equal to that excess. Additional information regarding goodwill and impairment testing can be found in Note 9 - Goodwill and Core Deposit Intangibles
Identifiable Intangibles	Identifiable Intangibles : Intangible assets are acquired assets that lack physical substance but can be distinguished from goodwill because of contractual or other legal rights or because the asset is capable of being sold or exchanged either on its own or in combination with a related contract, asset, or liability. The Company's intangible assets relate to core deposits and customer relationships. Intangible assets with definite useful lives are amortized on an accelerated basis over their estimated life. Intangible assets, premises and equipment and other long-lived assets are tested for impairment whenever events or changes in circumstances indicate the carrying amount of the assets may not be recoverable from future undiscounted cash flows. If impaired, the assets are recorded at fair value.
Foreclosed Assets, net	Foreclosed Assets : Assets acquired through loan foreclosure are initially recorded at the lower of the recorded investment in the loan at the time of foreclosure or the fair value less costs to sell, establishing a new cost basis. Any write-down in the carrying value of a property at the time of acquisition is charged-off to the allowance for loan losses. If fair value declines subsequent to foreclosure, a valuation allowance is recorded through expense. Operating costs after acquisition are expensed.
Derivative Financial Instruments	Derivative Financial Instruments : The Company enters into the following derivative financial instruments: interest rate lock commitments, forward mortgage-backed securities trades and interest rate swaps and caps. These financial instruments are not designated as hedging instruments and are used for asset and liability management and commercial customers' financing needs. All derivatives are carried at fair value in either other assets or other liabilities.
Fair Value of Financial Instruments	Fair Value of Financial Instruments : In general, fair values of financial instruments are based upon quoted market prices, where available. If such quoted market prices are not available, fair value is based upon internally developed models that primarily use, as inputs, observable market-based parameters. Valuation adjustments may be made to ensure that financial instruments are recorded at fair value. These adjustments may include amounts to reflect counterparty credit quality and the Company’s creditworthiness, among other things, as well as unobservable parameters. Any such valuation adjustments are applied consistently over time. Fair value measurements and disclosures guidance establishes a three-level fair value hierarchy based on the markets in which the assets and liabilities are traded and the reliability of the assumptions used to determine fair value.
Repurchase/Resell Agreements	Repurchase/Resell Agreements: The Company sells certain securities under agreements to repurchase. The securities sold under these agreements are treated as collateralized borrowings and are recorded at amounts equal to the cash received. The contractual terms of the agreements to repurchase may require the Company to provide additional collateral if the fair value of the securities underlying the borrowings declines during the term of the agreement.
Brokerage Fee Income	Brokerage Fee Income : Acting as an agent, the Company generates brokerage income by buying and selling securities on behalf of its customers through an independent third party and earning fees on the transactions. These fees are recorded on the trade date.
Advertising Expense	Advertising Expense : The Company expenses all advertising costs as they are incurred.
Share-Based Compensation	Share-Based Compensation : Compensation cost is recognized for stock options and restricted stock awards issued to employees and directors, based on the fair value of these awards at the date of grant. A Black-Scholes model is utilized to estimate the fair value of stock options, while the market price of the Company’s common stock at the date of grant is used for restricted stock awards. Compensation cost is recognized over the required service period, generally defined as the vesting period. For awards with time-based vesting, compensation cost is recognized on a straight-line basis over the requisite service period for the entire award. For awards with performance-based vesting conditions, compensation cost is recognized when the achievement of the performance condition is considered probable of achievement. If a performance condition is subsequently determined to be improbable of achievement, compensation cost is reversed.
Retirement Plans	Retirement Plans: Employee 401(k) and profit sharing plan expense is the amount of matching contributions as determined by formula. Deferred compensation and supplemental retirement plan expense allocates the benefits over years of service.
Income Taxes	Income Taxes : Income tax expense is the total of the current year income tax due or refundable and the change in deferred tax assets and liabilities. Deferred tax assets and liabilities are the expected future tax amounts for the temporary differences between carrying amounts and tax bases of assets and liabilities, computed using enacted tax rates. A valuation allowance, if needed, reduces deferred tax assets to the amount expected to be realized. A tax position is recognized as a benefit only if it is “more likely than not” that the tax position would be sustained in a tax examination, with a tax examination being presumed to occur. The amount recognized is the largest amount of tax benefit that is greater than 50% likely of being realized on examination. For tax positions not meeting the “more likely than not” test, no tax benefit is recorded. The Company did not have any material uncertain tax positions which would require accrual at December 31, 2016 or 2015 . The Company recognizes interest and/or penalties related to income tax matters in income tax expense and did not have any amounts accrued for interest and penalties for the years ended December 31, 2016 or 2015 . The Company files a consolidated income tax return with its subsidiaries. Federal income tax expense or benefit has been allocated to subsidiaries on a separate return basis.
Earnings per common share	Earnings per common share : The Company calculated earnings per common share in accordance with ASC 260, “Earnings Per Share,” which provides that unvested share-based payment awards that contain nonforfeitable rights to dividends or dividend equivalents (whether paid or unpaid) are participating securities and shall be included in the computation of earnings per share pursuant to the two-class method. The Company has determined that its outstanding non-vested stock awards are participating securities. Accordingly, earnings per common share is computed using the two-class method prescribed under ASC 260. Under the two-class method, basic earnings per common share is computed by dividing net earnings allocated to common stock by the weighted-average number of common shares outstanding during the applicable period, excluding outstanding participating securities. Diluted earnings per common share is computed using the weighted-average number of shares determined for the basic earnings per common share computation plus the dilutive effect of stock compensation using the treasury stock method. A reconciliation of the weighted-average shares used in calculating basic earnings per common share and the weighted average common shares used in calculating diluted earnings per common share for the reported periods is provided in Note 3 — Earnings Per Common Share .
Comprehensive Income (Loss)	Comprehensive Income (Loss) : Comprehensive income (loss) consists of net income and other comprehensive income (loss). Other comprehensive income (loss) includes unrealized gains and losses on securities available for sale, net of taxes, which are also recognized as a separate component of equity.
Employee stock ownership plan (ESOP)	Employee stock ownership plan (ESOP) : The Company accounts for its ESOP in accordance with ASC 718-40, "Employee Stock Ownership Plans." Accordingly, since the Company sponsors the ESOP with an employer loan, neither the ESOP’s loan payable nor the Company’s loan receivable are reported in the Company’s consolidated balance sheet. Likewise, the Company does not recognize interest income or interest cost on the loan. Unallocated shares held by the ESOP are recorded as unearned ESOP shares in the consolidated statement of changes in shareholders’ equity. As shares are committed to be released for allocation, the Company recognizes compensation expense equal to the average market price of the shares for the period. Dividends on allocated ESOP shares reduce retained earnings; dividends on unearned ESOP shares reduce principal and accrued interest payable on the ESOP loan.
Dividend Restriction	Dividend Restriction : Banking regulations require maintaining certain capital levels and may limit the dividends paid by the Bank to the Company or by the Company to shareholders.
Loss Contingencies	Loss Contingencies : Loss contingencies, including claims and legal actions arising in the ordinary course of business, are recorded as liabilities when the likelihood of loss is probable and an amount or range of loss can be reasonably estimated. Management does not believe there now are such matters that will have a material effect on the financial statements.
Transfers of Financial Assets	Transfers of Financial Assets : Transfers of financial assets are accounted for as sales when control over the assets has been surrendered. Control over transferred assets is deemed to be surrendered when (i) the assets have been isolated from the Company, (ii) the transferee has the right (free of conditions that constrain it from taking advantage of that right) to pledge or exchange the transferred assets, and (iii) the Company does not maintain effective control over the transferred assets through either (a) an agreement that entitles and obligates the Company to repurchase or redeem them before their maturity or (b) the ability to unilaterally cause the holder to return specific assets.
Operating Segments	Operating Segments: The Company has determined that all of its banking operations comprise one segment under ASC 280, Segment Reporting , since all offer similar products and services, operate with similar processes, and have similar customers. Additionally, the Company has determined that the Bank's title and insurance subsidiaries do not meet the materiality threshold to require segment disclosure under ASC 280. In 2016, the Bank sold the operations of LegacyTexas Insurance Services, Inc.
Loan Commitments And Related Financial Instruments	Loan Commitments and Related Financial Instruments : Financial instruments include off-balance sheet credit instruments, such as commitments to make loans and commercial letters of credit, issued to meet customer financing needs. The face amount for these items represents the exposure to loss, before considering customer collateral or ability to repay. Such financial instruments are recorded when they are funded.
Reclassifications	Reclassifications : Some items in the prior year financial statements were reclassified to conform to the current presentation.
Adoption of New Accounting Standards	Adoption of New Accounting Standards : In June 2014, the Financial Accounting Standards Board (the "FASB") issued Accounting Standards Update ("ASU") 2014-12, A ccounting for Share-Based Payments When the Terms of an Award Provide that a Performance Target Could Be Achieved after the Requisite Service Period . This ASU requires that a performance target that affects vesting and that could be achieved after the requisite service period be treated as a performance condition. The amendments were effective for annual periods, and interim periods within those years, beginning after December 15, 2015. The adoption of this ASU did not impact the Company's financial statements. In August 2014, the FASB issued ASU 2014-15, Disclosure of Uncertainties about an Entity's Ability to Continue as a Going Concern . This ASU defines management’s responsibility to evaluate whether there is substantial doubt about an organization’s ability to continue as a going concern and to provide related disclosures in the notes to financial statements. This ASU was effective for annual periods ending after December 15, 2016, and interim periods within annual periods beginning after December 15, 2016. Management does not have substantial doubt about the Company's ability to continue as a going concern within one year after the date of these financial statements; therefore, no additional disclosure on this topic is required. In January 2015, the FASB issued ASU 2015-01, Simplifying Income Statement Presentation by Eliminating the Concept of Extraordinary Items . This ASU simplifies income statement presentation by eliminating the need to determine whether to classify an item as an extraordinary item and retains current presentation and disclosure requirements for an event or transaction that is of an unusual nature or of a type that indicates infrequency of occurrence. Transactions that meet both criteria would now also follow such presentation and disclosure requirements. The ASU was effective in annual periods, and interim periods within those annual periods, beginning after December 15, 2015 and did not impact the Company's current disclosures. In February 2015, the FASB issued ASU 2015-02, Amendments to the Consolidation Analysis . This ASU affects all reporting entities that have variable interests in other legal entities and, in some cases, consolidation conclusions will change. In other cases, reporting entities will need to provide additional disclosures about entities that currently are not considered variable interest entities but will be considered variable interest entities under the new guidance if they have a variable interest in those entities. Reporting entities will need to re-evaluate their consolidation conclusions and potentially revise their documentation. The ASU was effective in annual and interim periods beginning after December 15, 2015. The adoption of this ASU did not impact the Company's consolidation analysis. In May 2015, the FASB issued ASU 2015-07, Disclosures for Investments in Certain Entities that Calculate Net Asset Value per Share . This ASU eliminates the current requirement to categorize within the fair value hierarchy investments whose fair values are measured at net asset value ("NAV"). Instead, entities will be required to disclose the fair values of such investments so that financial statement users can reconcile amounts reported in the fair value hierarchy table and the amounts reported on the balance sheet. The ASU was effective in annual and interim periods beginning after December 15, 2015. The Company does not currently have any investments measured at NAV within its fair value hierarchy and this ASU did not have an impact on the Company's statement of income or financial condition. In September 2015, the FASB issued ASU 2015-16, Business Combinations (Topic 805): Simplifying the Accounting for Measurement-Period Adjustments . To simplify the accounting for adjustments made to provisional amounts recognized in a business combination, this ASU eliminates the requirement to retrospectively account for those adjustments. The ASU requires an entity to present separately on the face of the income statement or disclose in the notes the portion of the amount recorded in current-period earnings by line item that would have been recorded in previous reporting periods if the adjustment to the provisional amounts had been recognized as of the acquisition date. For public business entities, the amendments were effective for fiscal years beginning after December 15, 2015, including interim periods within those fiscal years. The adoption of this ASU did not impact the Company's financial statements. Effect of Newly Issued But Not Yet Effective Accounting Standards In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers . This ASU states that an entity should 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. This ASU affects entities that enter into contracts with customers to transfer goods or services or enter into contracts for the transfer of nonfinancial assets, unless those contracts are within the scope of other standards. In August 2015, the FASB issued ASU 2015-14, "Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date," which deferred the effective date of ASU 2014-09 for public entities to annual reporting periods beginning after December 15, 2017, including interim reporting periods within that reporting period. Our revenue is comprised of net interest income on financial assets and financial liabilities, which is explicitly excluded from the scope of ASU 2014-09, and non-interest income. ASU 2014-09 could require us to change how we recognize certain recurring revenue streams; however, we do not expect these changes to have a significant impact on our financial statements. We continue to evaluate the impact of ASU 2014-09 on components of non-interest income. We expect to adopt the standard in the first quarter of 2018 with a cumulative effect adjustment to opening retained earnings, if such adjustment is deemed to be significant. In January 2016, the FASB issued ASU 2016-01, Recognition and Measurements of Financial Assets and Financial Liabilities . This ASU requires that all equity investments be measured at fair value with changes in the fair value recognized through net income (other than those accounted for under the equity method of accounting or those that result in consolidation of the investee). This ASU also requires that an entity 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. In addition, this ASU eliminates the requirement to disclose the fair value of financial instruments measured at amortized cost for entities that are not public business entities and the requirement to disclose the method(s) 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 for public business entities. For public business entities, this ASU is effective for annual periods beginning after December 15, 2017, and interim periods therein. The adoption of this ASU is not expected to have a significant impact on the Company's financial statements and disclosures. In February 2016, the FASB issued ASU 2016-02, Leases . This ASU requires lessees to put most leases on their balance sheets but recognize expenses in the income statement in a manner similar to current accounting treatment. This ASU changes the guidance on sale-leaseback transactions, initial direct costs and lease execution costs, and, for lessors, modifies the classification criteria and the accounting for sales-type and direct financing leases. For public business entities, this ASU is effective for annual periods beginning after December 15, 2018, and interim periods therein. Entities are required to use a modified retrospective approach for leases that exist or are entered into after the beginning of the earliest comparative period in the financial statements. The Company is evaluating the impact of this ASU on its financial statements and disclosures. In March 2016, the FASB issued ASU 2016-05, Effect of Derivative Contract Novations on Existing Hedge Accounting Relationships . This ASU clarifies that a change in the counterparty of a derivative contract (i.e., a novation) in a hedge accounting relationship does not, in and of itself, require dedesignation of the hedge accounting relationship. For public business entities, this ASU is effective for financial statements issued for fiscal years beginning after December 15, 2016, and interim periods therein. The adoption of this ASU is not expected to have a significant impact on the Company's financial statements and disclosures. In March 2016, the FASB issued ASU 2016-06, Contingent Put and Call Options in Debt Instruments . This ASU clarifies the requirements for assessing whether contingent call (put) options that can accelerate the payment of principal on debt instruments are clearly and closely related to their debt hosts. An entity performing the assessment under this ASU is required to assess the embedded call (put) options solely in accordance with the four-step decision sequence. The amendments apply to all entities that are issuers of or investors in debt instruments (or hybrid financial instruments that are determined to have a debt host) with embedded call (put) options. For public business entities, this ASU is effective for financial statements issued for fiscal years beginning after December 15, 2016, and interim periods therein. The adoption of this ASU is not expected to have a significant impact on the Company's financial statements and disclosures. In March 2016, the FASB issued ASU 2016-07, Simplifying the Transition to the Equity Method of Accounting . This ASU eliminates the requirement for an investor to retrospectively apply the equity method when an investment that it had accounted for by another method qualifies for use of the equity method. This ASU is effective for fiscal years beginning after December 15, 2016, and interim periods therein. The adoption of this ASU is not expected to have a significant impact on the Company's financial statements. In March 2016, the FASB issued ASU 2016-09, Improvements to Employee Share-Based Payment Accounting . This ASU simplifies several aspects of the accounting for employee share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. For public business entities, this ASU is effective for financial statements issued for fiscal years beginning after December 15, 2016, and interim periods therein. The adoption of this ASU is not expected to have a significant impact on the Company's financial statements. In June 2016, the FASB issued ASU 2016-13, Measurement of Credit Losses on Financial Instruments. This ASU removes the thresholds that companies apply to measure credit losses on financial instruments measured at amortized cost, such as loans, receivables, and held-to-maturity debt securities. Under current US GAAP, companies generally recognize credit losses when it is probable that the loss has been incurred. This revised guidance will remove all recognition thresholds and will require companies to recognize an allowance for lifetime expected credit losses. Credit losses will be immediately recognized through net income; the amount recognized will be based on the current estimate of contractual cash flows not expected to be collected over the financial asset’s contractual term. ASU 2016-13 also amends the credit loss measurement guidance for available for sale debt securities. For public business entities, this ASU is effective for financial statements issued for fiscal years and for interim periods within those fiscal years beginning after December 15, 2019. The Company is evaluating the impact of this ASU on its financial statements and disclosures. In August 2016, the FASB issued ASU 2016-15, Classification of Certain Cash Receipts and Cash Payments . This ASU is intended to reduce diversity in practice in how certain transactions are classified in the statement of cash flows, including debt prepayment or debt extinguishment costs, settlement of zero-coupon debt instruments, contingent consideration payments made after a business combination, proceeds from the settlement of insurance claims, and distributions received from equity method investments. For public business entities, this ASU is effective for financial statements issued for fiscal years beginning after December 15, 2017, and interim periods therein. The adoption of this ASU is not expected to have a significant impact on the Company's financial statements. In October 2016, the FASB issued ASU 2016-16, Intra-Entity Transfers of Assets other than Inventory . This ASU e liminates the exception for all intra-entity sales of assets other than inventory. As a result, a reporting entity would recognize the tax expense from the sale of the asset in the seller’s tax jurisdiction when the transfer occurs, even though the pre-tax effects of that transaction are eliminated in consolidation. Any deferred tax asset that arises in the buyer’s jurisdiction would also be recognized at the time of the transfer. For public business entities, this ASU is effective for financial statements issued for fiscal years beginning after December 15, 2017, and interim periods therein. The adoption of this ASU is not expected to have a significant impact on the Company's financial statements.

EARNINGS PER COMMON SHARE - (Ta

EARNINGS PER COMMON SHARE - (Tables)	12 Months Ended
	Dec. 31, 2016
Earnings Per Share [Abstract]
Reconciliation of Numerator and Denominator of Basic and Diluted Earnings per Common Share	A reconciliation of the numerator and denominator of the basic and diluted earnings per common share computation for the years ended December 31, 2016 , 2015 and 2014 is as follows: Years Ended December 31, 2016 2015 2014 Basic earnings per share: Numerator: Net income $ 97,821 $ 70,916 $ 31,278 Distributed and undistributed earnings to participating securities (497 ) (534 ) (336 ) Income available to common shareholders $ 97,324 $ 70,382 $ 30,942 Denominator: Weighted average common shares outstanding 47,721,179 47,659,389 39,979,853 Less: Average unallocated ESOP shares (1,301,356 ) (1,464,324 ) (1,648,518 ) Average unvested restricted stock awards (235,749 ) (347,781 ) (412,270 ) Average shares for basic earnings per share 46,184,074 45,847,284 37,919,065 Basic earnings per common share $ 2.11 $ 1.54 $ 0.82 Diluted earnings per share: Numerator: Income available to common shareholders $ 97,324 $ 70,382 $ 30,942 Denominator: Average shares for basic earnings per share 46,184,074 45,847,284 37,919,065 Dilutive effect of share-based compensation plan 300,893 278,163 243,029 Average shares for diluted earnings per share 46,484,967 46,125,447 38,162,094 Diluted earnings per common share $ 2.09 $ 1.53 $ 0.81 Share awards excluded in the computation of diluted earnings per share because the exercise price was greater than the common stock average market price and were therefore anti-dilutive 1,384,784 1,012,771 412,706

SECURITIES - (Tables)

SECURITIES - (Tables)	12 Months Ended
	Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]
Fair Value of Available-for-Sale Securities and Related Gross Unrealized Gains and Losses	The amortized cost, related gross unrealized gains and losses recognized in accumulated other comprehensive income (loss), and the fair value of securities available for sale were as follows: December 31, 2016 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Agency residential mortgage-backed securities 1 $ 220,744 $ 635 $ 2,828 $ 218,551 Agency commercial mortgage-backed securities 1 9,422 — 75 9,347 Agency residential collateralized mortgage obligations 1 87,959 22 1,452 86,529 US government and agency securities 2,150 101 — 2,251 Municipal bonds 38,417 47 627 37,837 Total securities $ 358,692 $ 805 $ 4,982 $ 354,515 December 31, 2015 Agency residential mortgage-backed securities 1 $ 224,582 $ 841 $ 1,575 $ 223,848 Agency commercial mortgage-backed securities 1 9,483 — 66 9,417 Agency residential collateralized mortgage obligations 1 22,430 26 142 22,314 US government and agency securities 14,906 148 — 15,054 Municipal bonds 40,512 637 74 41,075 Total securities $ 311,913 $ 1,652 $ 1,857 $ 311,708 1 Mortgage-backed securities and collateralized mortgage obligations are issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.
Carrying Amount, Unrecognized Gains and Losses, and Fair Value of Securities Held to Maturity	The amortized cost (carrying amount), unrealized gains and losses, and fair value of securities held to maturity were as follows: December 31, 2016 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Agency residential mortgage-backed securities 1 $ 74,881 $ 1,147 $ 817 $ 75,211 Agency commercial mortgage-backed securities 1 28,023 836 166 28,693 Agency residential collateralized mortgage obligations 1 40,707 697 33 41,371 Municipal bonds 66,776 1,635 705 67,706 Total securities $ 210,387 $ 4,315 $ 1,721 $ 212,981 December 31, 2015 Agency residential mortgage-backed securities 1 $ 87,935 $ 1,837 $ 284 $ 89,488 Agency commercial mortgage-backed securities 1 24,848 913 64 25,697 Agency residential collateralized mortgage obligations 1 59,174 1,087 55 60,206 Municipal bonds 68,476 3,447 112 71,811 Total securities $ 240,433 $ 7,284 $ 515 $ 247,202 1 Mortgage-backed securities and collateralized mortgage obligations are issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.
Carrying Amount and Fair Value of Held to Maturity Debt Securities and Fair Value of Available-for-Sale Debt Securities	The amortized cost (carrying amount) and fair value of held to maturity debt securities and the fair value of available for sale debt securities at December 31, 2016 by contractual maturity are set forth below in the table below. Securities with contractual payments not due at a single maturity date, including mortgage backed securities and collateralized mortgage obligations, are shown separately. Held to maturity Available for sale Carrying Amount Fair Value Fair Value Due in one year or less $ 1,952 $ 1,965 $ 2,159 Due after one to five years 9,035 9,293 11,909 Due after five to ten years 48,327 49,226 17,648 Due after ten years 7,462 7,222 8,372 Agency residential mortgage-backed securities 74,881 75,211 218,551 Agency commercial mortgage-backed securities 28,023 28,693 9,347 Agency residential collateralized mortgage obligations 40,707 41,371 86,529 Total $ 210,387 $ 212,981 $ 354,515
Summarized Sales Activity	Sales activity of securities for the years ended December 31, 2016 , 2015 and 2014 was as follows. All securities sold were classified as available for sale. December 31, 2016 2015 2014 Proceeds $ 7,700 $ 36,984 $ — Gross gains 72 278 — Gross losses 7 50 — Tax expense of securities gains/losses reclassified from accumulated other comprehensive income 23 80 —
Securities with Unrealized Losses Aggregated by Investment and Length of Time that Individual Securities have been in Continuous Unrealized Loss Position Category	Securities with unrealized losses at December 31, 2016 and 2015 , aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, were as follows: AFS Less than 12 Months 12 Months or More Total December 31, 2016 Fair Value Unrealized Loss Fair Value Unrealized Loss Fair Value Unrealized Loss Agency residential mortgage-backed securities 1 $ 167,503 $ 2,770 $ 7,516 $ 58 $ 175,019 $ 2,828 Agency commercial mortgage-backed securities 1 9,347 75 — — 9,347 75 Agency residential collateralized mortgage obligations 1 72,822 1,420 2,649 32 75,471 1,452 Municipal bonds 26,911 512 3,412 115 30,323 627 Total temporarily impaired $ 276,583 $ 4,777 $ 13,577 $ 205 $ 290,160 $ 4,982 December 31, 2015 Agency residential mortgage-backed securities 1 $ 158,172 $ 1,353 $ 10,474 $ 222 $ 168,646 $ 1,575 Agency commercial mortgage-backed securities 1 9,417 66 — — 9,417 66 Agency residential collateralized mortgage obligations 1 13,517 81 6,992 61 20,509 142 Municipal bonds 7,249 74 — — 7,249 74 Total temporarily impaired $ 188,355 $ 1,574 $ 17,466 $ 283 $ 205,821 $ 1,857 HTM Less than 12 Months 12 Months or More Total December 31, 2016 Fair Value Unrealized Loss Fair Value Unrealized Loss Fair Value Unrealized Loss Agency residential mortgage-backed securities 1 $ 41,375 $ 817 $ — $ — $ 41,375 $ 817 Agency commercial mortgage-backed securities 1 7,273 166 — — 7,273 166 Agency residential collateralized mortgage obligations 1 6,322 11 1,451 22 7,773 33 Municipal bonds 19,362 658 1,045 47 20,407 705 Total temporarily impaired $ 74,332 $ 1,652 $ 2,496 $ 69 $ 76,828 $ 1,721 December 31, 2015 Agency residential mortgage-backed securities 1 $ 41,935 $ 284 $ — $ — $ 41,935 $ 284 Agency commercial mortgage-backed securities 1 3,805 64 — — 3,805 64 Agency residential collateralized mortgage obligations 1 3,714 6 3,060 49 6,774 55 Municipal bonds 1,638 10 6,369 102 8,007 112 Total temporarily impaired $ 51,092 $ 364 $ 9,429 $ 151 $ 60,521 $ 515 1 Mortgage-backed securities and collateralized mortgage obligations are issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.

LOANS - (Tables)

LOANS - (Tables)	12 Months Ended
	Dec. 31, 2016
Receivables [Abstract]
Loans	Loans consist of the following: December 31, 2016 December 31, 2015 Loans held for sale $ 21,279 $ 22,535 Loans held for investment: Commercial real estate $ 2,670,455 $ 2,177,543 Commercial and industrial 1,971,160 1,612,669 Construction and land 294,894 269,708 Consumer real estate 1,074,923 936,757 Other consumer 53,991 69,830 Gross loans held for investment, excluding Warehouse Purchase Program 6,065,423 5,066,507 Net of: Deferred fees and discounts, net (2,251 ) (1,860 ) Allowance for loan losses (64,576 ) (47,093 ) Net loans held for investment, excluding Warehouse Purchase Program 5,998,596 5,017,554 Warehouse Purchase Program 1,055,341 1,043,719 Total loans held for investment $ 7,053,937 $ 6,061,273
Allowance for Loan Losses	Activity in the allowance for loan losses for the years ended December 31, 2016 , 2015 and 2014 , segregated by portfolio segment and evaluation for impairment, is set forth below. The below activity does not include Warehouse Purchase Program loans, which are collectively evaluated for impairment and are purchased under several contractual requirements, providing safeguards to the Company. To date, the Company has not experienced a loss on these loans and no allowance for loan losses has been allocated to them. At December 31, 2016 , 2015 and 2014 , the allowance for loan impairment related to purchased credit impaired ("PCI") loans totaled $180 , $150 , and $180 , respectively. December 31, 2016 Commercial Real Estate Commercial and Industrial Construction and Land Consumer Real Estate Other Consumer Total Allowance for loan losses: Beginning balance - January 1, 2016 $ 14,123 $ 24,975 $ 3,013 $ 3,992 $ 990 $ 47,093 Charge-offs (79 ) (7,746 ) — (107 ) (927 ) (8,859 ) Recoveries 21 472 — 109 340 942 Provision expense 4,238 17,763 2,062 490 847 25,400 Ending balance - December 31, 2016 $ 18,303 $ 35,464 $ 5,075 $ 4,484 $ 1,250 $ 64,576 Allowance ending balance: Individually evaluated for impairment $ 300 $ 4,521 $ — $ 138 $ 52 $ 5,011 Collectively evaluated for impairment 18,003 30,943 5,075 4,346 1,198 59,565 Loans: Individually evaluated for impairment 5,195 86,664 11,385 3,300 75 106,619 Collectively evaluated for impairment 2,659,644 1,884,263 283,509 1,070,732 53,683 5,951,831 PCI loans 5,616 233 — 891 233 6,973 Ending balance $ 2,670,455 $ 1,971,160 $ 294,894 $ 1,074,923 $ 53,991 $ 6,065,423 December 31, 2015 Commercial Real Estate Commercial and Industrial Construction and Land Consumer Real Estate Other Consumer Total Allowance for loan losses: Beginning balance - January 1, 2015 $ 11,830 $ 9,068 $ 174 $ 4,069 $ 408 $ 25,549 Charge-offs (167 ) (3,129 ) — (321 ) (1,090 ) (4,707 ) Recoveries 29 246 — 85 426 786 Provision expense 2,431 18,790 2,839 159 1,246 25,465 Ending balance - December 31, 2015 $ 14,123 $ 24,975 $ 3,013 $ 3,992 $ 990 $ 47,093 Allowance ending balance: Individually evaluated for impairment $ 366 $ 1,470 $ — $ 81 $ 61 $ 1,978 Collectively evaluated for impairment 13,757 23,505 3,013 3,911 929 45,115 Loans: Individually evaluated for impairment 11,580 16,906 33 4,767 120 33,406 Collectively evaluated for impairment 2,155,351 1,595,548 269,675 931,140 69,433 5,021,147 PCI loans 10,612 215 — 850 277 11,954 Ending balance $ 2,177,543 $ 1,612,669 $ 269,708 $ 936,757 $ 69,830 $ 5,066,507 December 31, 2014 Commercial Real Estate Commercial and Industrial Construction and Land Consumer Real Estate Other Consumer Total Allowance for loan losses: Beginning balance - January 1, 2014 $ 10,944 $ 4,536 $ 212 $ 3,280 $ 386 $ 19,358 Charge-offs — (568 ) (51 ) (237 ) (605 ) (1,461 ) Recoveries 435 94 1 38 363 931 Provision expense 451 5,006 12 988 264 6,721 Ending balance - December 31, 2014 $ 11,830 $ 9,068 $ 174 $ 4,069 $ 408 $ 25,549 Allowance ending balance: Individually evaluated for impairment $ 826 $ 1,840 $ — $ 223 $ 6 $ 2,895 Collectively evaluated for impairment 11,004 7,228 174 3,846 402 22,654 Loans: Individually evaluated for impairment 7,405 5,929 103 5,607 284 19,328 Collectively evaluated for impairment 1,253,336 775,699 21,195 517,492 40,042 2,607,764 PCI loans 5,127 196 — 1,100 165 6,588 Ending balance $ 1,265,868 $ 781,824 $ 21,298 $ 524,199 $ 40,491 $ 2,633,680 Changes in the allowance for off-balance sheet credit losses on lending-related commitments, included in "accrued expenses and other liabilities" on the consolidated balance sheets, are summarized in the following table. Please see Note 17 - Commitments and Contingent Liabilities for more information. Year Ended December 31, 2016 Balance at beginning of period $ — Charge-offs on lending-related commitments — Provision for credit losses on lending-related commitments 1,500 Balance at end of period $ 1,500
Impaired Loans	The carrying amount of PCI loans included in the consolidated balance sheets and the related outstanding balances at December 31, 2016 and 2015 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. December 31, 2016 2015 Carrying amount 1 $ 6,793 $ 11,804 Outstanding balance 7,597 13,053 1 The carrying amounts are reported net of allowance for loan losses of $180 and $150 as of December 31, 2016 and 2015 . Impaired loans at December 31, 2016 and 2015 , were as follows 1 : December 31, 2016 Unpaid Principal Balance Recorded Investment With No Allowance Recorded Investment With Allowance Total Recorded Investment Related Allowance Commercial real estate $ 5,388 $ 4,429 $ 766 $ 5,195 $ 272 Commercial and industrial 87,756 73,377 13,287 86,664 4,519 Construction and land 11,384 11,385 — 11,385 — Consumer real estate 3,766 3,290 10 3,300 10 Other consumer 107 33 42 75 30 Total $ 108,401 $ 92,514 $ 14,105 $ 106,619 $ 4,831 December 31, 2015 Commercial real estate $ 11,682 $ 10,618 $ 962 $ 11,580 $ 303 Commercial and industrial 18,649 13,894 3,012 16,906 1,467 Construction and land 38 33 — 33 — Consumer real estate 5,327 4,754 13 4,767 13 Other consumer 199 49 71 120 45 Total $ 35,895 $ 29,348 $ 4,058 $ 33,406 $ 1,828 1 No Warehouse Purchase Program loans were impaired at December 31, 2016 or 2015 . Loans reported do not include PCI loans. Income on impaired loans at December 31, 2016 , 2015 and 2014 , was as follows 1 December 31, 2016 December 31, 2015 December 31, 2014 Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized Commercial real estate $ 5,240 $ 9 $ 8,178 $ 24 $ 8,128 $ 23 Commercial and industrial 28,634 1 19,595 8 6,119 11 Construction and land 901 — 84 — 54 — Consumer real estate 4,831 14 5,269 7 5,008 26 Other consumer 95 4 202 2 433 5 Total $ 39,701 $ 28 $ 33,328 $ 41 $ 19,742 $ 65 1 Loans reported do not include PCI loans Changes in the accretable yield for PCI loans for the years ended December 31, 2016 and 2015 , are as follows: December 31, 2016 2015 Balance at beginning of period $ 3,356 $ 2,100 Additions — 1,907 Reclassifications (to) from nonaccretable 429 1,754 Disposals (359 ) (1,007 ) Accretion (911 ) (1,398 ) Balance at end of period $ 2,515 $ 3,356
Non-Performing (Nonaccrual) Loans	Non-performing (nonaccrual) loans were as follows: December 31, 2016 2015 Commercial real estate $ 5,195 $ 11,418 Commercial and industrial 86,664 16,877 Construction and land 11,385 33 Consumer real estate 7,987 9,781 Other consumer 158 107 Total $ 111,389 $ 38,216
Summary of Outstanding Balances of Troubled Debt Restructuring	The outstanding balances of TDRs are shown below: December 31, 2016 2015 Nonaccrual TDRs (1) $ 11,701 $ 6,207 Performing TDRs (2) 454 605 Total $ 12,155 $ 6,812 Specific reserves on TDRs $ 1,686 $ 487 Outstanding commitments to lend additional funds to borrowers with TDR loans — — 1 Nonaccrual TDR loans are included in the nonaccrual loan totals. 2 Performing TDR loans are loans that have been performing under the restructured terms for at least six months and the Company is accruing interest on these loans. The following table provides the recorded balances of loans modified as a TDR during the years ended December 31, 2016 , 2015 and 2014 . December 31, 2016 Principal Deferrals 1 Combination of Rate Reduction & Principal Deferral Other Total Commercial and industrial $ 685 $ — $ 7,090 (2) $ 7,775 Consumer real estate — 79 — 79 Other consumer 1 — — 1 Total $ 686 $ 79 $ 7,090 $ 7,855 December 31, 2015 Commercial real estate $ 100 $ — $ — $ 100 Commercial and industrial — — 191 191 Consumer real estate 209 60 36 305 Other consumer 1 — 3 4 Total $ 310 $ 60 $ 230 $ 600 December 31, 2014 Commercial and industrial $ 28 $ — $ 1,750 $ 1,778 Construction and land — — 102 102 Consumer real estate 197 262 461 920 Other consumer 11 6 — 17 Total $ 236 $ 268 $ 2,313 $ 2,817 1 Principal deferrals include Chapter 7 bankruptcy loans for which the court has discharged the borrower's obligation and the borrower has not reaffirmed the debt. Such loans are placed on non-accrual status. 2 Includes a $6.2 million reserve-based energy relationship; the primary modification to this relationship was suspension of required borrowing base payments. Loans modified as a TDR during the years ended December 31, 2016 , 2015 and 2014 , which experienced a subsequent payment default during the periods, are shown below. A payment default is defined as a loan that was 90 days or more past due. Years Ended December 31, 2016 2015 2014 Consumer real estate $ 31 $ 178 $ 107
Analysis of Age of Recorded Investment in Loans	Below is an analysis of the age of recorded investment in loans that were past due at December 31, 2016 and 2015 . No Warehouse Purchase Program loans were delinquent at December 31, 2016 or 2015 and therefore are not included in the following table. December 31, 2016 30-59 Days Past Due 60-89 Days Past Due 90 Days and Greater Past Due Total Loans Past Due Current Loans 1 Total Loans Commercial real estate $ 1,829 $ 72 $ 766 $ 2,667 $ 2,667,788 $ 2,670,455 Commercial and industrial 20,910 495 46 21,451 1,949,709 1,971,160 Construction and land 19,517 283 — 19,800 275,094 294,894 Consumer real estate 10,487 1,916 1,199 13,602 1,061,321 1,074,923 Other consumer 1,523 31 6 1,560 52,431 53,991 Total $ 54,266 $ 2,797 $ 2,017 $ 59,080 $ 6,006,343 $ 6,065,423 December 31, 2015 Commercial real estate $ 16 $ 176 $ 10,269 $ 10,461 $ 2,167,082 $ 2,177,543 Commercial and industrial 884 670 12,255 13,809 1,598,860 1,612,669 Construction and land 623 — — 623 269,085 269,708 Consumer real estate 10,880 2,463 3,458 16,801 919,956 936,757 Other consumer 463 37 — 500 69,330 69,830 Total $ 12,866 $ 3,346 $ 25,982 $ 42,194 $ 5,024,313 $ 5,066,507 1 Includes acquired PCI loans with a total carrying value of $6,729 and $11,328 at December 31, 2016 and 2015 , respectively.
Real Estate and Commercial and Industrial Credit Exposure Credit Risk Profile by Internally Assigned Grade	The recorded investment in loans by credit quality indicators at December 31, 2016 and 2015 , was as follows. Real Estate and Commercial and Industrial Credit Exposure Credit Risk Profile by Internally Assigned Grade December 31, 2016 Commercial Real Estate Commercial and Industrial Construction and Land Consumer Real Estate Grade: 1 Pass $ 2,648,842 $ 1,712,171 $ 283,423 $ 1,062,549 Special Mention 7,972 155,110 — 2,083 Substandard 12,875 103,815 11,471 8,252 Doubtful 766 64 — 2,039 Total $ 2,670,455 $ 1,971,160 $ 294,894 $ 1,074,923 December 31, 2015 Grade: 1 Pass $ 2,135,539 $ 1,460,725 $ 269,582 $ 920,519 Special Mention 13,633 92,048 — 3,327 Substandard 27,572 59,835 93 9,606 Doubtful 799 61 33 3,305 Total $ 2,177,543 $ 1,612,669 $ 269,708 $ 936,757 1 PCI loans are included in the substandard or doubtful categories for December 31, 2016 and 2015 , respectively. These categories are generally consistent with the "substandard" and "doubtful" categories as defined by regulatory authorities.
Consumer Credit Exposure Credit Risk Profile Based on Payment Activity	Credit Risk Profile Based on Payment Activity December 31, 2016 December 31, 2015 Performing $ 53,833 $ 69,723 Non-performing 158 107 Total $ 53,991 $ 69,830

FAIR VALUE - (Tables)

FAIR VALUE - (Tables)	12 Months Ended
	Dec. 31, 2016
Fair Value Disclosures [Abstract]
Summary of Fair Value Measured on Recurring Basis	Assets and liabilities measured at fair value on a recurring basis are summarized below. Fair Value Measurements Using Level 2 December 31, 2016 December 31, 2015 Assets: Agency residential mortgage-backed securities $ 218,551 $ 223,848 Agency commercial mortgage-backed securities 9,347 9,417 Agency residential collateralized mortgage obligations 86,529 22,314 US government and agency securities 2,251 15,054 Municipal bonds 37,837 41,075 Total securities available for sale $ 354,515 $ 311,708 Loans held for sale 1 $ 21,279 $ 22,535 Derivative financial instruments: Interest rate lock commitments 379 421 Forward mortgage-backed securities trades 36 15 Loan customer counterparty — 260 Financial institution counterparty 1,369 — Liabilities: Derivative financial instruments: Interest rate lock commitments — — Forward mortgage-backed securities trades 80 29 Loan customer counterparty 1,369 — Financial institution counterparty — 260 1 At December 31, 2016 and 2015 , loans held for sale had an aggregate outstanding principal balance of $20,946 and $21,851 . There were no mortgage loans held for sale that were 90 days or greater past due or on non-accrual at December 31, 2016 .
Summary of Fair Value Measured on Nonrecurring Basis	Assets measured at fair value on a non-recurring basis are summarized below. There were no liabilities measured at fair value on a non-recurring basis as of December 31, 2016 or 2015 . Fair Value Measurements Using Level 3 December 31, 2016 December 31, 2015 Assets: Impaired loans $ 9,274 $ 2,230 Foreclosed assets: Commercial real estate 10,638 4,784 Construction and land 194 1,802 Consumer real estate — 106 Other 6 —
Fair Value, by Balance Sheet Grouping	The carrying amount and fair value information of financial instruments not recorded at fair value in their entirety on a recurring basis on the Company's consolidated balance sheets at December 31, 2016 and 2015 , were as follows: Fair Value December 31, 2016 Carrying Amount Level 1 Level 2 Level 3 Financial assets Cash and cash equivalents $ 289,212 $ 289,212 $ — $ — Securities held to maturity 210,387 — 212,981 — Loans held for investment, net 5,998,596 — — 6,080,165 Loans held for investment - Warehouse Purchase Program 1,055,341 — — 1,055,219 FHLB and other restricted securities, at cost 43,266 — 43,266 — Accrued interest receivable 20,347 20,347 — — Financial liabilities Deposits $ 6,365,476 $ — $ — $ 5,989,933 FHLB advances 833,682 — — 830,930 Repurchase agreements 86,691 — — 84,265 Subordinated debt 134,032 — — 121,743 Accrued interest payable 2,111 2,111 — — December 31, 2015 Financial assets Cash and cash equivalents $ 615,639 $ 615,639 $ — $ — Securities held to maturity 240,433 — 247,202 — Loans held for investment, net 5,017,554 — — 5,083,093 Loans held for investment - Warehouse Purchase Program 1,043,719 — — 1,042,434 FHLB and other restricted securities, at cost 63,075 — 63,075 — Accrued interest receivable 17,109 17,109 — — Financial liabilities Deposits $ 5,226,711 $ — $ — $ 4,920,648 FHLB advances 1,439,904 — — 1,433,125 Repurchase agreement 83,269 — — 81,956 Subordinated debt 84,992 — — 85,771 Accrued interest payable 1,653 1,653 — —

DERIVATIVE FINANCIAL INSTRUME34

DERIVATIVE FINANCIAL INSTRUMENTS - (Tables)	12 Months Ended
	Dec. 31, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Notional Amounts of Outstanding Derivative Positions	The following table provides the outstanding notional balances and fair values of outstanding derivative positions at December 31, 2016 and 2015 . December 31, 2016 December 31, 2015 Outstanding Notional Balance Asset Derivative Fair Value Liability Derivative Fair Value Outstanding Notional Balance Asset Derivative Fair Value Liability Derivative Fair Value IRLCs $ 10,952 $ 379 $ — $ 12,518 $ 421 $ — Forward mortgage-backed securities trades 18,613 36 80 20,374 15 29 Commercial loan interest rate swaps and caps: Loan customer counterparty 112,294 — 1,369 24,796 $ 260 — Financial institution counterparty 112,294 1,369 — 24,796 — 260 The commercial loan customer counterparty weighted average received and paid interest rates for interest rate swaps outstanding at December 31, 2016 and 2015 are presented in the following table. Weighted-Average Interest Rate December 31, 2016 December 31, 2015 Received Paid Received Paid Loan customer counterparty 3.12 % 2.36 % 5.01 % 3.37 % Income (loss) for the years ending December 31, 2016 , 2015 and 2014 was as follows: Derivatives not designated as hedging instruments Years Ended December 31, 2016 2015 2014 IRLC's $ (43 ) $ 8 $ — Forward mortgage-backed securities trades 13 (195 ) —

PREMISES AND EQUIPMENT - (Table

PREMISES AND EQUIPMENT - (Tables)	12 Months Ended
	Dec. 31, 2016
Property, Plant and Equipment [Abstract]
Premises and Equipment	Premises and equipment were as follows: December 31, 2016 2015 Land $ 23,636 $ 25,546 Buildings 59,298 60,807 Furniture, fixtures and equipment 19,561 18,848 Leasehold improvements 7,674 7,556 110,169 112,757 Less: accumulated depreciation (35,943 ) (35,120 ) Total $ 74,226 $ 77,637
Schedule of future minimum rental payments for operating leases	Rent commitments, before considering applicable renewal options, as of December 31, 2016 , were as follows: Balance 2017 $ 6,218 2018 5,634 2019 4,791 2020 4,424 2021 4,238 Thereafter 20,572 Total $ 45,877

GOODWILL AND CORE DEPOSIT INT36

GOODWILL AND CORE DEPOSIT INTANGIBLES - (Tables)	12 Months Ended
	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Changes In Carrying Amount of Company's Goodwill and Core Deposit Intangibles (Cdi)	Changes in the carrying amount of the Company's goodwill and core deposit intangibles (“CDI”) for years ended December 31, 2016 and 2015 , were as follows: Goodwill Core Deposit Intangibles Balance as of December 31, 2014 $ 29,650 $ 616 LegacyTexas Group, Inc. acquisition 151,126 880 Amortization of core deposit intangible — (466 ) Balance as of December 31, 2015 180,776 1,030 Disposition of insurance subsidiary goodwill upon the sale of subsidiary operations (2,217 ) — Amortization of core deposit intangible — (365 ) Balance as of December 31, 2016 $ 178,559 $ 665
Estimated Aggregate Future Amortization Expense for Intangible Assets Remaining	The estimated aggregate future amortization expense for CDI remaining as of December 31, 2016 is as follows: Balance 2017 $ 263 2018 156 2019 101 2020 73 2021 48 Thereafter 24

DEPOSITS - (Tables)

DEPOSITS - (Tables)	12 Months Ended
	Dec. 31, 2016
Banking and Thrift [Abstract]
Scheduled Maturity of Time Deposits	At December 31, 2016 , scheduled maturities of time deposits for the next five years with the weighted average rate at the end of the period were as follows: Balance Weighted Average Rate 2017 $ 992,786 0.73 % 2018 256,150 0.99 2019 29,019 0.98 2020 22,858 1.39 2021 and thereafter 67,091 1.65 Total $ 1,367,904 0.84 %
Interest Expense on Deposits	Interest expense on deposits is summarized as follows: Years Ended December 31, 2016 2015 2014 Interest-bearing demand $ 3,974 $ 3,297 $ 1,653 Savings and money market 7,288 3,644 3,144 Time 9,772 6,186 3,415 Total $ 21,034 $ 13,127 $ 8,212

BORROWED FUNDS - (Tables)

BORROWED FUNDS - (Tables)	12 Months Ended
	Dec. 31, 2016
Debt Disclosure [Abstract]
Schedule of Long-term Debt Instruments]	Borrowed funds are summarized as follows: December 31, 2016 2015 Amount Rate 1 Amount Rate 1 Federal Home Loan Bank advances $ 833,682 0.71 % $ 1,439,904 0.51 % Repurchase Agreements Credit Suisse structured repurchase agreement 25,000 3.02 25,000 3.22 Overnight repurchase agreements with depositors 61,691 0.15 58,269 0.16 Subordinated Debt Fixed to floating rate note maturing on December 1, 2025 125,000 5.58 75,000 5.50 Junior subordinated debentures 15,464 2.66 15,464 2.21 1 Rate at period-end, with the exception of the fixed to floating rate subordinated debt note, which is a weighted average rate calculated using period-end rates.
Debt Pay Down Schedule	At December 31, 2016 , borrowed funds, reported gross of purchase accounting fair value discounts, prepayment penalties and debt issuance costs, were structured to contractually pay down as follows: FHLB Advances Repurchase Agreements Subordinated Debt Total 2017 $ 615,546 $ 61,691 $ — $ 677,237 2018 212,754 25,000 — 237,754 2019 2,314 — — 2,314 2020 931 — — 931 2021 856 — — 856 Thereafter 1,308 — 140,464 141,772 $ 833,709 $ 86,691 $ 140,464 $ 1,060,864

BENEFITS (Tables)

BENEFITS (Tables)	12 Months Ended
	Dec. 31, 2016
Compensation and Retirement Disclosure [Abstract]
Employee Stock Ownership Plan (ESOP) Disclosures	Shares held by the ESOP at December 31 are categorized as follows: 2016 2015 Allocated to participants 1,643,294 1,522,883 Unearned 1,245,046 1,365,457 Total ESOP shares 2,888,340 2,888,340 Fair value of unearned shares at December 31 $ 53,612 $ 34,164

SHARE-BASED COMPENSATION - (Tab

SHARE-BASED COMPENSATION - (Tables)	12 Months Ended
	Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs	Compensation cost charged to income for share-based compensation, which is reported in non-interest expense as salaries and employee benefits expense, is presented below: Years ended December 31, 2016 2015 2014 Restricted stock $ 3,477 $ 3,459 $ 2,561 Stock options 2,537 2,018 1,156 Income tax benefit 2,105 1,917 1,301
Nonvested Shares for the Company's Stock Plans	A summary of activity in the restricted stock portion of the Company's stock plans for 2016 , 2015 and 2014 is presented below: Time-Based Shares Performance-Based Shares Shares Weighted- Average Grant Date Fair Value 1 Shares Weighted- Average Grant Date Fair Value 2 Non-vested at January 1, 2014 381,402 $ 20.39 82,400 $ 27.45 Granted 20,000 24.69 — — Vested (103,799 ) 20.32 — — Non-vested at December 31, 2014 297,603 20.45 82,400 23.89 Granted 80,000 21.23 — — Vested (131,142 ) 19.98 (20,600 ) 23.89 Non-vested at December 31, 2015 246,461 20.98 61,800 25.02 Granted 55,180 29.29 40,200 29.29 Vested (101,465 ) 20.70 (20,600 ) 25.02 Non-vested at December 31, 2016 200,176 $ 23.79 81,400 $ 43.06 1 For restricted stock awards with time-based vesting conditions, the grant date fair value is based upon the closing stock price as quoted on the NASDAQ Stock Market on the grant date. 2 For restricted stock awards with performance-based vesting conditions, the value of the award is based upon the closing stock price as quoted on the NASDAQ Stock Market on the date of vesting. Until the final value is determined on the vesting date, the Company estimates the fair value quarterly based upon the closing stock price as quoted on the NASDAQ Stock Market near the last business day of each calendar quarter end.
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions	The fair value of options granted was determined using the following weighted-average assumptions as of grant date: 2016 2015 2014 Risk-free interest rate 1.37 % 1.80 % 2.16 % Expected term of stock options (years) 6.3 6.2 6.2 Expected stock price volatility 32.07 % 31.14 % 30.96 % Expected dividends 1.93 % 1.95 % 1.84 %
Summary of Activity under Stock Option Portion of Equity Incentive Plan	A summary of activity in the stock option portion of the Company's share-based compensation plans as of the years ended December 31, 2016 , 2015 and 2014 is presented below: Options Shares Weighted- Average Exercise Price Weighted- Average Remaining Contractual Term Aggregate Intrinsic Value Outstanding at January 1, 2014 1,173,618 $ 18.16 8.4 $ 10,903 Granted 328,750 26.09 10.0 — Exercised (56,035 ) 13.66 — 652 Forfeited (75,460 ) 17.63 — — Outstanding at December 31, 2014 1,370,873 20.27 8.0 5,679 Granted 633,000 25.66 10.0 — Exercised (58,855 ) 16.12 — 644 Forfeited (79,268 ) 20.89 — — Outstanding at December 31, 2015 1,865,750 22.21 7.9 6,401 Granted 392,838 29.15 10.0 — Exercised (175,192 ) 19.08 — 2,251 Forfeited (75,316 ) 25.57 — — Outstanding at December 31, 2016 2,008,080 $ 23.71 7.4 $ 38,850 Fully vested and expected to vest 1,990,524 $ 23.68 7.4 $ 38,585 Exercisable at December 31, 2016 719,156 $ 20.51 6.2 $ 16,218

INCOME TAXES - (Tables)

INCOME TAXES - (Tables)	12 Months Ended
	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Summary of Income Tax Expense (Benefit)	Income tax expense for 2016 , 2015 and 2014 , was as follows: 2016 2015 2014 Current expense $ 59,900 $ 38,648 $ 19,073 Deferred expense (6,798 ) (692 ) (1,414 ) Total income tax expense $ 53,102 $ 37,956 $ 17,659
Summary of Deferred Tax Assets and Liabilities	At December 31, 2016 and 2015 , deferred tax assets and liabilities were due to the following: December 31, 2016 2015 Deferred tax assets: Allowance for loan losses $ 22,602 $ 16,483 Deferred compensation arrangements 1,261 1,536 Self-funded health insurance 241 203 Non-accrual interest 966 632 Restricted stock and stock options 3,132 2,275 Accrued expenses 1,255 715 Fair value mark on purchased loans 2,348 3,838 Net unrealized loss on securities available for sale 1,465 72 Other 2,121 811 35,391 26,565 Deferred tax liabilities: Depreciation (336 ) (1,011 ) Partnerships — CRA-purposed private equity funds (1,697 ) (1,328 ) Fair value mark on subordinated debt (1,303 ) (1,367 ) Other (2,824 ) (1,819 ) (6,160 ) (5,525 ) Net deferred tax asset $ 29,231 $ 21,040
Income Tax Rate Reconciliation	Effective tax rates differ from the federal statutory rate of 35% in 2016 , 2015 and 2014 , applied to income before income taxes due to the following: At and for the Year Ended December 31, 2016 2015 2014 Federal statutory rate times financial statement income $ 52,823 $ 38,105 $ 17,128 Effect of: State taxes, net of federal benefit 267 37 66 Tax credit on CRA-purposed private equity fund — — (58 ) Bank-owned life insurance income (436 ) (419 ) (220 ) Municipal interest income (1,041 ) (1,025 ) (772 ) ESOP shares released 757 1,207 1,140 One-time merger expenses — — 381 Sale of LegacyTexas Insurance Services, Inc. 640 — — Other 92 51 (6 ) Total income tax expense $ 53,102 $ 37,956 $ 17,659 Effective Tax Rate 35.18 % 34.86 % 36.09 %

RELATED PARTY TRANSACTIONS - (T

RELATED PARTY TRANSACTIONS - (Tables)	12 Months Ended
	Dec. 31, 2016
Related Party Transactions [Abstract]
RELATED PARTY TRANSACTIONS	Loans to executive officers, directors, and their affiliates during 2016 were as follows: Balance Beginning balance $ 15,365 New loans 21 Effect of changes in composition of related parties — Repayments (49 ) Ending balance $ 15,337

REGULATORY CAPITAL MATTERS - (T

REGULATORY CAPITAL MATTERS - (Tables)	12 Months Ended
	Dec. 31, 2016
Regulatory Capital Requirements [Abstract]
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations	Actual Required for Capital Adequacy Purposes To Be Well-Capitalized Amount Ratio Amount Ratio Amount Ratio As of December 31, 2016 Total risk-based capital the Company $ 910,040 11.71 % $ 621,870 8.00 % $ 777,338 10.00 % the Bank 869,523 11.19 621,840 8.00 777,300 10.00 Tier 1 risk-based capital the Company 721,600 9.28 466,403 6.00 466,403 6.00 the Bank 803,374 10.34 466,380 6.00 621,840 8.00 Common equity tier 1 risk-based capital the Company 709,858 9.13 349,802 4.50 n/a 1 n/a 1 the Bank 803,374 10.34 349,785 4.50 505,245 6.50 Tier 1 leverage the Company 721,600 8.73 330,782 4.00 n/a 1 n/a 1 the Bank 803,374 9.71 330,873 4.00 413,591 5.00 As of December 31, 2015 Total risk-based capital the Company $ 755,689 11.58 % $ 522,107 8.00 % $ 652,634 10.00 % the Bank 691,554 10.60 522,116 8.00 652,645 10.00 Tier 1 risk-based capital the Company 635,162 9.73 391,580 6.00 391,580 6.00 the Bank 644,461 9.87 391,587 6.00 522,116 8.00 Common equity tier 1 risk-based capital the Company 623,604 9.56 293,685 4.50 n/a 1 n/a 1 the Bank 644,461 9.87 293,690 4.50 424,219 6.50 Tier 1 leverage the Company 635,162 9.46 268,430 4.00 n/a 1 n/a 1 the Bank 644,461 9.61 268,273 4.00 335,341 5.00 1 Not applicable

COMMITMENTS AND CONTINGENT LI44

COMMITMENTS AND CONTINGENT LIABILITIES - (Tables)	12 Months Ended
	Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Schedule of Fair Value, Off-balance Sheet Risks [Table Text Block]	The contractual amounts of financial instruments with off‑balance sheet risk at December 31, 2016 and 2015 , are summarized below. Please see Part II-Item 7- "Off-Balance Sheet Arrangements, Contractual Obligation and Commitments" of this Form 10-K for information related to commitment maturities. December 31, 2016 2015 Unused commitments to extend credit $ 1,642,528 $ 1,211,964 Unused capacity on Warehouse Purchase Program loans 892,659 476,281 Standby letters of credit 29,198 18,644 Total unused commitments/capacity $ 2,564,385 $ 1,706,889

PARENT COMPANY ONLY CONDENSED45

PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION - (Tables)	12 Months Ended
	Dec. 31, 2016
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Schedule of Condensed Balance Sheet	Condensed financial information of the Company is as follows: CONDENSED BALANCE SHEETS December 31, 2016 2015 ASSETS Cash on deposit at subsidiary $ 16,962 $ 42,980 Investment in banking subsidiary 978,880 824,933 Receivable from banking subsidiary 10,317 7,456 ESOP note receivable and other assets 13,999 14,498 Total assets $ 1,020,158 $ 889,867 LIABILITIES AND SHAREHOLDERS’ EQUITY Borrowings $ 134,032 $ 84,992 Other liabilities 761 799 Shareholders’ equity 885,365 804,076 Total liabilities and shareholders’ equity $ 1,020,158 $ 889,867
Schedule of Condensed Income Statement	CONDENSED STATEMENTS OF INCOME December 31, 2016 2015 2014 Cash dividends from subsidiary $ — $ 24,500 $ 19,187 Excess of earnings over dividend from subsidiary 103,572 48,677 20,044 Interest income on ESOP loan 487 565 633 Interest income on subordinated debt 11 17 — Other income — 5 — 104,070 73,764 39,864 Interest expense 6,040 1,046 — Operating expenses 3,236 3,009 13,036 Earnings before income tax benefit 94,794 69,709 26,828 Income tax benefit 3,027 1,207 4,450 Net income $ 97,821 $ 70,916 $ 31,278
Schedule of Condensed Cash Flow Statement	CONDENSED STATEMENTS OF CASH FLOWS December 31, 2016 2015 2014 Cash flows from operating activities Net income $ 97,821 $ 70,916 $ 31,278 Adjustments to reconcile net income to net cash from operating activities: Excess of earnings over dividend from subsidiary (103,572 ) (48,677 ) (20,044 ) Amortization 530 171 — Activity in share-based compensation plans 3,152 3,068 3,096 Net change in intercompany receivable — — (31,395 ) Net change in other assets (481 ) 6,931 (1,820 ) Net change in other liabilities (38 ) (14,544 ) 4,134 Net cash provided by (used in) operating activities (2,588 ) 17,865 (14,751 ) Cash flows from investing activities Capital contribution (to) from subsidiary (49,000 ) (40,000 ) 31,395 Cash and cash equivalents acquired from LegacyTexas Group, Inc. — 201 — Payments received on ESOP notes receivable 981 1,495 1,427 Net cash provided by (used in) investing activities (48,019 ) (38,304 ) 32,822 Cash flows from financing activities Proceeds from borrowings 73,439 73,407 — Repayments of borrowings (24,929 ) (24,364 ) — Share repurchase — (7,989 ) — Net issuance of common stock under employee stock plans 3,755 1,284 1,085 Payment of dividends (27,676 ) (25,747 ) (19,187 ) Net cash provided by (used in) financing activities 24,589 16,591 (18,102 ) Net change in cash and cash equivalents (26,018 ) (3,848 ) (31 ) Beginning cash and cash equivalents 42,980 46,828 46,859 Ending cash and cash equivalents $ 16,962 $ 42,980 $ 46,828

QUARTERLY FINANCIAL DATA (Una46

QUARTERLY FINANCIAL DATA (Unaudited) - (Tables)	12 Months Ended
	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Schedule of Quarterly Financial Information	Net Interest Income Provision Securities Gains and (Losses) Earnings per Share Interest Income Interest Expense Net Income Basic Diluted 2016 First quarter $ 72,608 $ 7,257 $ 65,351 $ 8,800 $ — $ 22,082 0.48 0.48 Second quarter 77,336 7,982 69,354 6,800 65 23,217 0.50 0.50 Third quarter 82,911 9,431 73,480 3,467 (3 ) 27,217 0.59 0.58 Fourth quarter 84,497 10,413 74,084 7,833 (6 ) 25,305 0.54 0.54 2015 First quarter $ 61,618 $ 5,292 $ 56,326 $ 3,000 $ 211 $ 16,324 0.35 0.35 Second quarter 64,967 5,146 59,821 3,750 — 20,251 0.44 0.44 Third quarter 66,525 5,337 61,188 7,515 (25 ) 17,895 0.39 0.38 Fourth quarter 69,582 5,840 63,742 11,200 17 16,446 0.36 0.35

SUMMARY OF SIGNIFICANT ACCOUN47

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)segmentloan_production_office	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)
Property, Plant and Equipment [Line Items]
Number of segments | segment	1
Number of full-service branches | loan_production_office	45
Days past due to be considered delinquent	30 days
Days delinquent for interest on loan to be discontinued	90 days
Days delinquent for a consumer loan to be typically charged off	120 days
Consumer loans, nonperforming, period Before placed into nonaccrual status	90 days
Troubled debt restructuring non accrual period	6 months
Performance period for troubled debt restructuring loans to return to accrual status	6 months
Advertising expense	$ 3,861	$ 3,773	$ 1,535
Buildings [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful lives	10 years
Buildings [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful lives	30 years
Furniture, fixtures and equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful lives	3 years
Furniture, fixtures and equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful lives	7 years
Residential Portfolio Segment [Member]
Property, Plant and Equipment [Line Items]
Threshold for not being measured on an individual basis, unpaid principal for impaired financing receivable	$ 417

SHARE TRANSACTIONS - (Details)

SHARE TRANSACTIONS - (Details) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2013	Aug. 22, 2012
Stockholders' Equity Note [Abstract]
Percentage of shares authorized to be repurchased				5.00%
Repurchase authorized (in shares)				1,978,871
Average price of stock retired (in dollars per share)		$ 22.32	$ 18.55
Stock repurchased and retired during period (in shares)	0	357,950	83,800
Remaining available for purchase (shares)	1,537,121

EARNINGS PER COMMON SHARE - Rec

EARNINGS PER COMMON SHARE - Reconciliation of Numerator and Denominator of Basic and Diluted Earnings per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Numerator:
Net income									$ 97,821	$ 70,916	$ 31,278
Distributed and undistributed earnings to participating securities									(497)	(534)	(336)
Income available to common shareholders									$ 97,324	$ 70,382	$ 30,942
Denominator:
Weighted average common shares outstanding (in shares)									47,721,179	47,659,389	39,979,853
Less: Average unallocated ESOP shares (in shares)									(1,301,356)	(1,464,324)	(1,648,518)
Average unvested restricted stock awards (in shares)									(235,749)	(347,781)	(412,270)
Average shares for basic earnings per share (in shares)									46,184,074	45,847,284	37,919,065
Basic earnings per common share (in dollars per share)	$ 0.54	$ 0.59	$ 0.50	$ 0.48	$ 0.36	$ 0.39	$ 0.44	$ 0.35	$ 2.11	$ 1.54	$ 0.82
Numerator:
Income available to common shareholders									$ 97,324	$ 70,382	$ 30,942
Denominator:
Average shares for basic earnings per share (in shares)									46,184,074	45,847,284	37,919,065
Dilutive effect of share-based compensation plan (in shares)									300,893	278,163	243,029
Average shares for diluted earnings per share (in shares)									46,484,967	46,125,447	38,162,094
Diluted earnings per common share (in dollars per share)	$ 0.54	$ 0.58	$ 0.50	$ 0.48	$ 0.35	$ 0.38	$ 0.44	$ 0.35	$ 2.09	$ 1.53	$ 0.81
Share awards excluded in the computation of diluted earnings per share because the exercise price was greater than the common stock average market price and were therefore anti-dilutive (in shares)									1,384,784	1,012,771	412,706

SECURITIES - Fair Value of Avai

SECURITIES - Fair Value of Available-for-Sale Securities and Related Gross Unrealized Gains and Losses (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 358,692	$ 311,913
Gross Unrealized Gains	805	1,652
Gross Unrealized Losses	4,982	1,857
Fair Value	354,515	311,708
Agency Residential Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	220,744	224,582
Gross Unrealized Gains	635	841
Gross Unrealized Losses	2,828	1,575
Fair Value	218,551	223,848
Agency Commercial Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	9,422	9,483
Gross Unrealized Gains	0	0
Gross Unrealized Losses	75	66
Fair Value	9,347	9,417
Agency Collateralized Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	87,959	22,430
Gross Unrealized Gains	22	26
Gross Unrealized Losses	1,452	142
Fair Value	86,529	22,314
US government and agency securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,150	14,906
Gross Unrealized Gains	101	148
Gross Unrealized Losses	0	0
Fair Value	2,251	15,054
Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	38,417	40,512
Gross Unrealized Gains	47	637
Gross Unrealized Losses	627	74
Fair Value	$ 37,837	$ 41,075

SECURITIES - Carrying Amount, U

SECURITIES - Carrying Amount, Unrecognized Gains and Losses, and Fair Value of Securities Held to Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 210,387	$ 240,433
Gross Unrealized Gains	4,315	7,284
Gross Unrealized Losses	1,721	515
Fair Value	212,981	247,202
Agency Residential Mortgage Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	74,881	87,935
Gross Unrealized Gains	1,147	1,837
Gross Unrealized Losses	817	284
Fair Value	75,211	89,488
Agency Commercial Mortgage Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	28,023	24,848
Gross Unrealized Gains	836	913
Gross Unrealized Losses	166	64
Fair Value	28,693	25,697
Agency Collateralized Mortgage Backed Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	40,707	59,174
Gross Unrealized Gains	697	1,087
Gross Unrealized Losses	33	55
Fair Value	41,371	60,206
Municipal Bonds [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	66,776	68,476
Gross Unrealized Gains	1,635	3,447
Gross Unrealized Losses	705	112
Fair Value	$ 67,706	$ 71,811

SECURITIES - Carrying Amount an

SECURITIES - Carrying Amount and Fair Value of Held to Maturity Debt Securities and Fair Value of Available-for-Sale Debt Securities (Details) $ in Thousands	Dec. 31, 2016USD ($)
Available For Sale And Held To Maturity Securities [Line Items]
Held to maturity, Carrying Amount, Due in one year or less	$ 1,952
Held to maturity, Carrying Amount, Due from one to five years	9,035
Held to maturity, Carrying Amount, Due from five to ten years	48,327
Held to maturity, Carrying Amount, Due after ten years	7,462
Held to maturity, Carrying Amount	210,387
Held to maturity, Fair Value, Due in one year or less	1,965
Held to maturity, Fair Value, Due from one to five years	9,293
Held to maturity, Fair Value, Due from five to ten years	49,226
Held to maturity, Fair Value, Due after ten years	7,222
Fair value of securities held to maturity	212,981
Available for sale, Fair Value, Due in one year or less	2,159
Available for sale, Fair Value, Due from one to five years	11,909
Available for sale, Fair Value, Due from five to ten years	17,648
Available for sale, Fair Value, Due after ten years	8,372
Securities available for sale, at fair value	354,515
Agency Residential Mortgage Backed Securities [Member]
Available For Sale And Held To Maturity Securities [Line Items]
Held to maturity, Carrying Amount	74,881
Fair value of securities held to maturity	75,211
Securities available for sale, at fair value	218,551
Agency Commercial Mortgage Backed Securities [Member]
Available For Sale And Held To Maturity Securities [Line Items]
Held to maturity, Carrying Amount	28,023
Fair value of securities held to maturity	28,693
Securities available for sale, at fair value	9,347
Agency Collateralized Mortgage Backed Securities [Member]
Available For Sale And Held To Maturity Securities [Line Items]
Held to maturity, Carrying Amount	40,707
Fair value of securities held to maturity	41,371
Securities available for sale, at fair value	$ 86,529

SECURITIES - Summarized Sales A

SECURITIES - Summarized Sales Activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Proceeds	$ 7,700	$ 36,984	$ 0
Gross gains	72	278	0
Gross losses	7	50	0
Tax expense of securities gains/losses reclassified from accumulated other comprehensive income	$ 23	$ 80	$ 0

SECURITIES - Securities with Un

SECURITIES - Securities with Unrealized Losses Aggregated by Investment and Length of Time that Individual Securities Have Been in Continuous Unrealized Loss Position Category (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Available For Sale And Held To Maturity Securities [Line Items]
Fair Value, Less than 12 months	$ 276,583	$ 188,355
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses Accumulated In Investments	4,777	1,574
Fair Value, 12 Months or More	13,577	17,466
Available for Sale Securities Continuous Unrealized Loss Position 12 months or Longer Aggregate Losses Accumulated in Investments	205	283
Fair Value, Total	290,160	205,821
Available for Sale Securities Continuous Unrealized Loss Position Aggregate Losses Accumulated in Investments	4,982	1,857
Fair Value, Less than 12 Months	74,332	51,092
Held To Maturity Securities Continuous Unrealized Loss Position Less Than 12 Months Accumulated Loss	1,652	364
Fair Value, 12 Months or More	2,496	9,429
Held To Maturity Securities Continuous Unrealized Loss Position 12 Months Or Longer Accumulated Loss	69	151
Fair Value, Total	76,828	60,521
Held to Maturity Securities Accumulated Unrecognized Holding Loss	1,721	515
Agency Residential Mortgage Backed Securities [Member]
Available For Sale And Held To Maturity Securities [Line Items]
Fair Value, Less than 12 months	167,503	158,172
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses Accumulated In Investments	2,770	1,353
Fair Value, 12 Months or More	7,516	10,474
Available for Sale Securities Continuous Unrealized Loss Position 12 months or Longer Aggregate Losses Accumulated in Investments	58	222
Fair Value, Total	175,019	168,646
Available for Sale Securities Continuous Unrealized Loss Position Aggregate Losses Accumulated in Investments	2,828	1,575
Fair Value, Less than 12 Months	41,375	41,935
Held To Maturity Securities Continuous Unrealized Loss Position Less Than 12 Months Accumulated Loss	817	284
Fair Value, 12 Months or More	0	0
Held To Maturity Securities Continuous Unrealized Loss Position 12 Months Or Longer Accumulated Loss	0	0
Fair Value, Total	41,375	41,935
Held to Maturity Securities Accumulated Unrecognized Holding Loss	817	284
Agency Commercial Mortgage Backed Securities [Member]
Available For Sale And Held To Maturity Securities [Line Items]
Fair Value, Less than 12 months	9,347	9,417
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses Accumulated In Investments	75	66
Fair Value, 12 Months or More	0	0
Available for Sale Securities Continuous Unrealized Loss Position 12 months or Longer Aggregate Losses Accumulated in Investments	0	0
Fair Value, Total	9,347	9,417
Available for Sale Securities Continuous Unrealized Loss Position Aggregate Losses Accumulated in Investments	75	66
Fair Value, Less than 12 Months	7,273	3,805
Held To Maturity Securities Continuous Unrealized Loss Position Less Than 12 Months Accumulated Loss	166	64
Fair Value, 12 Months or More	0	0
Held To Maturity Securities Continuous Unrealized Loss Position 12 Months Or Longer Accumulated Loss	0	0
Fair Value, Total	7,273	3,805
Held to Maturity Securities Accumulated Unrecognized Holding Loss	166	64
Agency Collateralized Mortgage Backed Securities [Member]
Available For Sale And Held To Maturity Securities [Line Items]
Fair Value, Less than 12 months	72,822	13,517
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses Accumulated In Investments	1,420	81
Fair Value, 12 Months or More	2,649	6,992
Available for Sale Securities Continuous Unrealized Loss Position 12 months or Longer Aggregate Losses Accumulated in Investments	32	61
Fair Value, Total	75,471	20,509
Available for Sale Securities Continuous Unrealized Loss Position Aggregate Losses Accumulated in Investments	1,452	142
Fair Value, Less than 12 Months	6,322	3,714
Held To Maturity Securities Continuous Unrealized Loss Position Less Than 12 Months Accumulated Loss	11	6
Fair Value, 12 Months or More	1,451	3,060
Held To Maturity Securities Continuous Unrealized Loss Position 12 Months Or Longer Accumulated Loss	22	49
Fair Value, Total	7,773	6,774
Held to Maturity Securities Accumulated Unrecognized Holding Loss	33	55
Municipal Bonds [Member]
Available For Sale And Held To Maturity Securities [Line Items]
Fair Value, Less than 12 months	26,911	7,249
Available For Sale Securities Continuous Unrealized Loss Position Less Than 12 Months Aggregate Losses Accumulated In Investments	512	74
Fair Value, 12 Months or More	3,412	0
Available for Sale Securities Continuous Unrealized Loss Position 12 months or Longer Aggregate Losses Accumulated in Investments	115	0
Fair Value, Total	30,323	7,249
Available for Sale Securities Continuous Unrealized Loss Position Aggregate Losses Accumulated in Investments	627	74
Fair Value, Less than 12 Months	19,362	1,638
Held To Maturity Securities Continuous Unrealized Loss Position Less Than 12 Months Accumulated Loss	658	10
Fair Value, 12 Months or More	1,045	6,369
Held To Maturity Securities Continuous Unrealized Loss Position 12 Months Or Longer Accumulated Loss	47	102
Fair Value, Total	20,407	8,007
Held to Maturity Securities Accumulated Unrecognized Holding Loss	$ 705	$ 112

SECURITIES - Narrative (Details

SECURITIES - Narrative (Details) $ in Thousands	Dec. 31, 2016USD ($)security	Dec. 31, 2015USD ($)
Investments, Debt and Equity Securities [Abstract]
Held-to-maturity securities pledged as collateral | $	$ 224,674	$ 280,629
Number of securities in unrealized loss position	241
Number of securities in unrealized loss position for more than one year	21

LOANS - Narrative (Details)

LOANS - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)Contract	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)
Receivables [Abstract]
Portion of allowance for loan losses allocated to PCI loans	$ 180	$ 150	$ 180
Loans past due over 90 days and still accruing	$ 141	111
Number of PCI loans that are considered non-performing | Contract	0
Interest that would have been recognized on non-accrual loans if performing	$ 1,746	$ 1,594	$ 1,192
Troubled debt restructuring, default payment	90 days

LOANS - Loans (Details)

LOANS - Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale	$ 21,279	$ 22,535
Other consumer	53,991	69,830
Total	6,065,423	5,066,507
Deferred fees and discounts, net	(2,251)	(1,860)
Allowance for loan losses	(64,576)	(47,093)	$ (25,549)	$ (19,358)
Net loans held for investment, excluding Warehouse Purchase Program	5,998,596	5,017,554
Warehouse Purchase Program	1,055,341	1,043,719
Total loans held for investment	7,053,937	6,061,273
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial real estate	2,670,455	2,177,543	1,265,868
Allowance for loan losses	(18,303)	(14,123)	(11,830)	(10,944)
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and industrial	1,971,160	1,612,669	781,824
Allowance for loan losses	(35,464)	(24,975)	(9,068)	(4,536)
Construction and Land [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Construction and land	294,894	269,708	21,298
Allowance for loan losses	(5,075)	(3,013)	(174)	(212)
Consumer Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Consumer real estate	1,074,923	936,757	524,199
Allowance for loan losses	(4,484)	(3,992)	(4,069)	(3,280)
Other consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Other consumer	53,991	69,830	40,491
Allowance for loan losses	$ (1,250)	$ (990)	$ (408)	$ (386)

LOANS - Allowance for loan loss

LOANS - Allowance for loan losses (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance				$ 47,093				$ 25,549	$ 47,093	$ 25,549	$ 19,358
Charge-offs									(8,859)	(4,707)	(1,461)
Recoveries									942	786	931
Provision expense	$ 7,833	$ 3,467	$ 6,800	8,800	$ 11,200	$ 7,515	$ 3,750	3,000	25,400	25,465	6,721
Ending balance	64,576				47,093				64,576	47,093	25,549
Allowance: Individually evaluated for impairment	5,011				1,978				5,011	1,978	2,895
Allowance for Credit Losses, Collectively Evaluated for Impairment	59,565				45,115				59,565	45,115	22,654
Loans: Individually evaluated for impairment	106,619				33,406				106,619	33,406	19,328
Loans: Collectively evaluated for impairment	5,951,831				5,021,147				5,951,831	5,021,147	2,607,764
PCI loans	6,973				11,954				6,973	11,954	6,588
Other consumer	53,991				69,830				53,991	69,830
Ending balance	6,065,423				5,066,507				6,065,423	5,066,507	2,633,680
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance				14,123				11,830	14,123	11,830	10,944
Charge-offs									(79)	(167)	0
Recoveries									21	29	435
Provision expense									4,238	2,431	451
Ending balance	18,303				14,123				18,303	14,123	11,830
Allowance: Individually evaluated for impairment	300				366				300	366	826
Allowance for Credit Losses, Collectively Evaluated for Impairment	18,003				13,757				18,003	13,757	11,004
Loans: Individually evaluated for impairment	5,195				11,580				5,195	11,580	7,405
Loans: Collectively evaluated for impairment	2,659,644				2,155,351				2,659,644	2,155,351	1,253,336
PCI loans	5,616				10,612				5,616	10,612	5,127
Commercial real estate	2,670,455				2,177,543				2,670,455	2,177,543	1,265,868
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance				24,975				9,068	24,975	9,068	4,536
Charge-offs									(7,746)	(3,129)	(568)
Recoveries									472	246	94
Provision expense									17,763	18,790	5,006
Ending balance	35,464				24,975				35,464	24,975	9,068
Allowance: Individually evaluated for impairment	4,521				1,470				4,521	1,470	1,840
Allowance for Credit Losses, Collectively Evaluated for Impairment	30,943				23,505				30,943	23,505	7,228
Loans: Individually evaluated for impairment	86,664				16,906				86,664	16,906	5,929
Loans: Collectively evaluated for impairment	1,884,263				1,595,548				1,884,263	1,595,548	775,699
PCI loans	233				215				233	215	196
Commercial and industrial	1,971,160				1,612,669				1,971,160	1,612,669	781,824
Construction and Land [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance				3,013				174	3,013	174	212
Charge-offs									0	0	(51)
Recoveries									0	0	1
Provision expense									2,062	2,839	12
Ending balance	5,075				3,013				5,075	3,013	174
Allowance: Individually evaluated for impairment	0				0				0	0	0
Allowance for Credit Losses, Collectively Evaluated for Impairment	5,075				3,013				5,075	3,013	174
Loans: Individually evaluated for impairment	11,385				33				11,385	33	103
Loans: Collectively evaluated for impairment	283,509				269,675				283,509	269,675	21,195
PCI loans	0				0				0	0	0
Construction and land	294,894				269,708				294,894	269,708	21,298
Consumer Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance				3,992				4,069	3,992	4,069	3,280
Charge-offs									(107)	(321)	(237)
Recoveries									109	85	38
Provision expense									490	159	988
Ending balance	4,484				3,992				4,484	3,992	4,069
Allowance: Individually evaluated for impairment	138				81				138	81	223
Allowance for Credit Losses, Collectively Evaluated for Impairment	4,346				3,911				4,346	3,911	3,846
Loans: Individually evaluated for impairment	3,300				4,767				3,300	4,767	5,607
Loans: Collectively evaluated for impairment	1,070,732				931,140				1,070,732	931,140	517,492
PCI loans	891				850				891	850	1,100
Consumer real estate	1,074,923				936,757				1,074,923	936,757	524,199
Other consumer [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance				$ 990				$ 408	990	408	386
Charge-offs									(927)	(1,090)	(605)
Recoveries									340	426	363
Provision expense									847	1,246	264
Ending balance	1,250				990				1,250	990	408
Allowance: Individually evaluated for impairment	52				61				52	61	6
Allowance for Credit Losses, Collectively Evaluated for Impairment	1,198				929				1,198	929	402
Loans: Individually evaluated for impairment	75				120				75	120	284
Loans: Collectively evaluated for impairment	53,683				69,433				53,683	69,433	40,042
PCI loans	233				277				233	277	165
Other consumer	$ 53,991				$ 69,830				$ 53,991	$ 69,830	$ 40,491

LOANS - Off-Balance Sheet (Deta

LOANS - Off-Balance Sheet (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Charge-offs on lending-related commitments	$ 8,859	$ 4,707	$ 1,461
Other Liabilities [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	0
Charge-offs on lending-related commitments	0
Provision for credit losses on lending-related commitments	1,500
Balance at end of period	$ 1,500	$ 0

LOANS - Impaired Loans (Details

LOANS - Impaired Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	$ 108,401	$ 35,895
Recorded Investment With No Allowance	92,514	29,348
Recorded Investment With Allowance	14,105	4,058
Total Recorded Investment	106,619	33,406
Related Allowance	4,831	1,828
Average Recorded Investment	39,701	33,328	$ 19,742
Interest Income Recognized	28	41	65
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	5,388	11,682
Recorded Investment With No Allowance	4,429	10,618
Recorded Investment With Allowance	766	962
Total Recorded Investment	5,195	11,580
Related Allowance	272	303
Average Recorded Investment	5,240	8,178	8,128
Interest Income Recognized	9	24	23
Commercial and Industrial [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	87,756	18,649
Recorded Investment With No Allowance	73,377	13,894
Recorded Investment With Allowance	13,287	3,012
Total Recorded Investment	86,664	16,906
Related Allowance	4,519	1,467
Average Recorded Investment	28,634	19,595	6,119
Interest Income Recognized	1	8	11
Construction and Land [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	11,384	38
Recorded Investment With No Allowance	11,385	33
Recorded Investment With Allowance	0	0
Total Recorded Investment	11,385	33
Related Allowance	0	0
Average Recorded Investment	901	84	54
Interest Income Recognized	0	0	0
Consumer Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	3,766	5,327
Recorded Investment With No Allowance	3,290	4,754
Recorded Investment With Allowance	10	13
Total Recorded Investment	3,300	4,767
Related Allowance	10	13
Average Recorded Investment	4,831	5,269	5,008
Interest Income Recognized	14	7	26
Other consumer [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	107	199
Recorded Investment With No Allowance	33	49
Recorded Investment With Allowance	42	71
Total Recorded Investment	75	120
Related Allowance	30	45
Average Recorded Investment	95	202	433
Interest Income Recognized	$ 4	$ 2	$ 5

LOANS - Non-Performing (nonaccr

LOANS - Non-Performing (nonaccrual) loans (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-performing	$ 111,389	$ 38,216
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-performing	5,195	11,418
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-performing	86,664	16,877
Construction and Land [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-performing	11,385	33
Consumer Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-performing	7,987	9,781
Other consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-performing	$ 158	$ 107

LOANS - Summary of Outstanding

LOANS - Summary of Outstanding Balances of Troubled Debt Restructuring (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
TDRs	$ 12,155	$ 6,812
Specific reserves on TDRs	1,686	487
Outstanding commitments to lend additional funds to borrowers with TDR loans	$ 0	0
Troubled debt restructuring non accrual period	6 months
Nonaccrual TDRs [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
TDRs	$ 11,701	6,207
Performing TDRs [Member]
Troubled Debt Restructuring, Debtor, Current Period [Line Items]
TDRs	$ 454	$ 605

LOANS - Information on Loans Mo

LOANS - Information on Loans Modified as Troubled Debt Restructuring by Category (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Modifications [Line Items]
Loans modified as a TDR	$ 7,855	$ 600	$ 2,817
Principal Deferrals [Member]
Financing Receivable, Modifications [Line Items]
Loans modified as a TDR	686	310	236
Combination of Rate Reduction and Principal Deferral [Member]
Financing Receivable, Modifications [Line Items]
Loans modified as a TDR	79	60	268
Other [Member]
Financing Receivable, Modifications [Line Items]
Loans modified as a TDR	7,090	230	2,313
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Loans modified as a TDR		100
Commercial Real Estate [Member] | Principal Deferrals [Member]
Financing Receivable, Modifications [Line Items]
Loans modified as a TDR		100
Commercial Real Estate [Member] | Combination of Rate Reduction and Principal Deferral [Member]
Financing Receivable, Modifications [Line Items]
Loans modified as a TDR		0
Commercial Real Estate [Member] | Other [Member]
Financing Receivable, Modifications [Line Items]
Loans modified as a TDR		0
Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Loans modified as a TDR	7,775	191	1,778
Commercial and Industrial [Member] | Principal Deferrals [Member]
Financing Receivable, Modifications [Line Items]
Loans modified as a TDR	685	0	28
Commercial and Industrial [Member] | Combination of Rate Reduction and Principal Deferral [Member]
Financing Receivable, Modifications [Line Items]
Loans modified as a TDR	0	0	0
Commercial and Industrial [Member] | Other [Member]
Financing Receivable, Modifications [Line Items]
Loans modified as a TDR	7,090	191	1,750
Commercial and Industrial [Member] | Reserve Based Energy Relationship [Member]
Financing Receivable, Modifications [Line Items]
Loans modified as a TDR	6,200
Construction and Land [Member]
Financing Receivable, Modifications [Line Items]
Loans modified as a TDR			102
Construction and Land [Member] | Principal Deferrals [Member]
Financing Receivable, Modifications [Line Items]
Loans modified as a TDR			0
Construction and Land [Member] | Combination of Rate Reduction and Principal Deferral [Member]
Financing Receivable, Modifications [Line Items]
Loans modified as a TDR			0
Construction and Land [Member] | Other [Member]
Financing Receivable, Modifications [Line Items]
Loans modified as a TDR			102
Consumer Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Loans modified as a TDR	79	305	920
Financing receivable, modifications, subsequent default, recorded investment	31	178	107
Consumer Real Estate [Member] | Principal Deferrals [Member]
Financing Receivable, Modifications [Line Items]
Loans modified as a TDR	0	209	197
Consumer Real Estate [Member] | Combination of Rate Reduction and Principal Deferral [Member]
Financing Receivable, Modifications [Line Items]
Loans modified as a TDR	79	60	262
Consumer Real Estate [Member] | Other [Member]
Financing Receivable, Modifications [Line Items]
Loans modified as a TDR	0	36	461
Other consumer [Member]
Financing Receivable, Modifications [Line Items]
Loans modified as a TDR	1	4	17
Other consumer [Member] | Principal Deferrals [Member]
Financing Receivable, Modifications [Line Items]
Loans modified as a TDR	1	1	11
Other consumer [Member] | Combination of Rate Reduction and Principal Deferral [Member]
Financing Receivable, Modifications [Line Items]
Loans modified as a TDR	0	0	6
Other consumer [Member] | Other [Member]
Financing Receivable, Modifications [Line Items]
Loans modified as a TDR	$ 0	$ 3	$ 0

LOANS - Carrying Amount of Acqu

LOANS - Carrying Amount of Acquired PCI Loans Included in the Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Receivables [Abstract]
Carrying amount	$ 6,793	$ 11,804
Outstanding balance	7,597	13,053
Portion of allowance for loan losses allocated to PCI loans	$ 180	$ 150	$ 180

LOANS - Changes in the Accretab

LOANS - Changes in the Accretable Yield for Acquired PCI Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance at beginning of period	$ 3,356	$ 2,100
Additions	0	1,907
Reclassifications (to) from nonaccretable	429	1,754
Disposals	(359)	(1,007)
Accretion	(911)	(1,398)
Balance at end of period	$ 2,515	$ 3,356

LOANS - Analysis of Age of Reco

LOANS - Analysis of Age of Recorded Investment in Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	$ 59,080	$ 42,194
Current Loans	6,006,343	5,024,313
Other consumer	53,991	69,830
Total	6,065,423	5,066,507
Carrying value, Current portion PCI loans	6,729	11,328
Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	54,266	12,866
Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	2,797	3,346
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	2,017	25,982
Commercial Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	2,667	10,461
Current Loans	2,667,788	2,167,082
Commercial real estate	2,670,455	2,177,543	$ 1,265,868
Commercial Real Estate [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	1,829	16
Commercial Real Estate [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	72	176
Commercial Real Estate [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	766	10,269
Commercial and Industrial [Member]
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	21,451	13,809
Current Loans	1,949,709	1,598,860
Commercial and industrial	1,971,160	1,612,669	781,824
Commercial and Industrial [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	20,910	884
Commercial and Industrial [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	495	670
Commercial and Industrial [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	46	12,255
Construction and Land [Member]
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	19,800	623
Current Loans	275,094	269,085
Construction and land	294,894	269,708	21,298
Construction and Land [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	19,517	623
Construction and Land [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	283	0
Construction and Land [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	0	0
Consumer Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	13,602	16,801
Current Loans	1,061,321	919,956
Consumer real estate	1,074,923	936,757	524,199
Consumer Real Estate [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	10,487	10,880
Consumer Real Estate [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	1,916	2,463
Consumer Real Estate [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	1,199	3,458
Other consumer [Member]
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	1,560	500
Current Loans	52,431	69,330
Other consumer	53,991	69,830	$ 40,491
Other consumer [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	1,523	463
Other consumer [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	31	37
Other consumer [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Total Loans Past Due	$ 6	$ 0

LOANS - Real Estate and Commerc

LOANS - Real Estate and Commercial and Industrial Credit Exposure Credit Risk Profile by Internally Assigned Grade (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Real Estate	$ 2,670,455	$ 2,177,543	$ 1,265,868
Commercial Real Estate [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Real Estate	2,648,842	2,135,539
Commercial Real Estate [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Real Estate	7,972	13,633
Commercial Real Estate [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Real Estate	12,875	27,572
Commercial Real Estate [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Real Estate	766	799
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial and Industrial	1,971,160	1,612,669	781,824
Commercial and Industrial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial and Industrial	1,712,171	1,460,725
Commercial and Industrial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial and Industrial	155,110	92,048
Commercial and Industrial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial and Industrial	103,815	59,835
Commercial and Industrial [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial and Industrial	64	61
Construction and Land [Member]
Financing Receivable, Recorded Investment [Line Items]
Construction and Land	294,894	269,708	21,298
Construction and Land [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Construction and Land	283,423	269,582
Construction and Land [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Construction and Land	0	0
Construction and Land [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Construction and Land	11,471	93
Construction and Land [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Construction and Land	0	33
Consumer Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Consumer Real Estate	1,074,923	936,757	$ 524,199
Consumer Real Estate [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Consumer Real Estate	1,062,549	920,519
Consumer Real Estate [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Consumer Real Estate	2,083	3,327
Consumer Real Estate [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Consumer Real Estate	8,252	9,606
Consumer Real Estate [Member] | Doubtful [Member]
Financing Receivable, Recorded Investment [Line Items]
Consumer Real Estate	$ 2,039	$ 3,305

LOANS - Consumer Credit Exposur

LOANS - Consumer Credit Exposure Credit Risk Profile Based on Payment Activity (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Non-performing	$ 111,389	$ 38,216
Total	53,991	69,830
Other consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Non-performing	158	107
Total	53,991	69,830	$ 40,491
Performing Financing Receivable [Member] | Other Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	$ 53,833	$ 69,723

FAIR VALUE - Narrative (Details

FAIR VALUE - Narrative (Details) $ in Thousands	Dec. 31, 2016USD ($)
Fair Value Disclosures [Abstract]
Mortgage loans on real estate, pending foreclosures	$ 92

FAIR VALUE - Summary of Fair Va

FAIR VALUE - Summary of Fair Value Measured on Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	$ 354,515	$ 311,708
Loans held for sale	21,279	22,535
Outstanding principal	20,946	21,851
Interest Rate Lock Commitments [Member] | Not Designated as Hedging Instrument [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	379	421
Derivative liability	0	0
Forward Mortgage Backed Securities Trades [Member] | Not Designated as Hedging Instrument [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	36	15
Derivative liability	80	29
Financial Institution Counterparty [Member] | Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member] | Commercial Loan [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	1,369	0
Derivative liability	0	260
Agency Residential Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	218,551	223,848
Agency Commercial Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	9,347	9,417
Agency Collateralized Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	86,529	22,314
US Government Agencies Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	2,251	15,054
Municipal Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	37,837	41,075
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	354,515	311,708
Loans held for sale	21,279	22,535
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Loan Customer Counterparty [Member] | Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member] | Commercial Loan [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	0	260
Derivative liability	1,369	0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Agency Residential Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	218,551	223,848
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Agency Commercial Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	9,347	9,417
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Agency Collateralized Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	86,529	22,314
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | US Government Agencies Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	2,251	15,054
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Municipal Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	$ 37,837	$ 41,075

FAIR VALUE - Summary of Fair 71

FAIR VALUE - Summary of Fair Value Measured on Nonrecurring Basis (Details) - Fair Value, Inputs, Level 3 [Member] - Fair Value, Measurements, Nonrecurring [Member] - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	$ 9,274	$ 2,230
Commercial Real Estate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreclosed assets	10,638	4,784
Construction and Land [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreclosed assets	194	1,802
Consumer Real Estate [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreclosed assets	0	106
Other Portfolio Segment [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreclosed assets	$ 6	$ 0

FAIR VALUE - Carrying Amount an

FAIR VALUE - Carrying Amount and Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 289,212	$ 615,639	$ 132,021	$ 87,974
Securities held to maturity	210,387	240,433
Securities held to maturity	212,981	247,202
Loans held for investment, net	5,998,596	5,017,554
Loans held for investment - Warehouse Purchase Program	1,055,341	1,043,719
Federal Home Loan Bank (FHLB) stock and other restricted securities, at cost	43,266	63,075
Accrued interest receivable	20,347	17,109
Deposits	6,365,476	5,226,711
FHLB advances	833,682	1,439,904
Repurchase agreements	86,691	83,269
Subordinated debt	134,032	84,992
Accrued interest payable	2,111	1,653
Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	289,212	615,639
Accrued interest receivable	20,347	17,109
Accrued interest payable	2,111	1,653
Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities held to maturity	212,981	247,202
Federal Home Loan Bank (FHLB) stock and other restricted securities, at cost	43,266	63,075
Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans held for investment, net	6,080,165	5,083,093
Loans held for investment - Warehouse Purchase Program	1,055,219	1,042,434
Deposits	5,989,933	4,920,648
FHLB advances	830,930	1,433,125
Repurchase agreements	84,265	81,956
Subordinated debt	$ 121,743	$ 85,771

DERIVATIVE FINANCIAL INSTRUME73

DERIVATIVE FINANCIAL INSTRUMENTS - Schedule of Outstanding Notional Balances and Fair Values of Outstanding Positions (Details) - Not Designated as Hedging Instrument [Member] - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Interest Rate Lock Commitments [Member]
Derivative [Line Items]
Asset, Outstanding Notional Balance	$ 10,952	$ 12,518
Asset, Fair Value	379	421
Liability, Fair Value	0	0
Forward Mortgage Backed Securities Trades [Member]
Derivative [Line Items]
Asset, Outstanding Notional Balance	18,613	20,374
Asset, Fair Value	36	15
Liability, Fair Value	80	29
Loan Customer Counterparty [Member] | Commercial Loan [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Asset, Outstanding Notional Balance	112,294	24,796
Financial Institution Counterparty [Member] | Commercial Loan [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Asset, Fair Value	1,369	0
Liability, Outstanding Notional Balance	112,294	24,796
Liability, Fair Value	0	260
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Loan Customer Counterparty [Member] | Commercial Loan [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Asset, Fair Value	0	260
Liability, Fair Value	$ 1,369	$ 0

DERIVATIVE FINANCIAL INSTRUME74

DERIVATIVE FINANCIAL INSTRUMENTS - Schedule of Notional Amounts of Outstanding Derivative Positions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, collateral pledged	$ 1,950	$ 300
Interest Rate Swap [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Credit exposure	118
Interest Rate Lock Commitments [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain/loss	(43)	8	$ 0
Forward Mortgage Backed Securities Trades [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain/loss	13	$ (195)	$ 0
Financial Institution Counterparty [Member] | Interest Rate Swap [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Credit exposure	$ 1,335
Loan Customer Counterparty [Member] | Commercial Loan [Member] | Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Commercial loan/lease interest rate swaps. Weighted-Average Interest Rate Received	3.12%	5.01%
Commercial loan/lease interest rate swaps. Weighted-Average Interest Rate Paid	2.36%	3.37%

PREMISES AND EQUIPMENT - (Detai

PREMISES AND EQUIPMENT - (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 110,169	$ 112,757
Less: accumulated depreciation	(35,943)	(35,120)
Total	74,226	77,637
Land [Member]
Property, Plant and Equipment [Line Items]
Land	23,636	25,546
Buildings [Member]
Property, Plant and Equipment [Line Items]
Buildings	59,298	60,807
Furniture, fixtures and equipment [Member]
Property, Plant and Equipment [Line Items]
Furniture, fixtures and equipment	19,561	18,848
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Leasehold improvements	$ 7,674	$ 7,556

PREMISES AND EQUIPMENT - Rent C

PREMISES AND EQUIPMENT - Rent Commitments (Details) $ in Thousands	Dec. 31, 2016USD ($)
Property, Plant and Equipment [Abstract]
2,017	$ 6,218
2,018	5,634
2,019	4,791
2,020	4,424
2,021	4,238
Thereafter	20,572
Total	$ 45,877

PREMISES AND EQUIPMENT - Narrat

PREMISES AND EQUIPMENT - Narrative (Details) $ in Thousands	1 Months Ended	12 Months Ended
	Jan. 31, 2017USD ($)	Dec. 31, 2016USD ($)Parcel_of_land	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)
Property, Plant and Equipment [Line Items]
Depreciation		$ 6,186	$ 6,550	$ 4,047
Rent expense		7,928	$ 6,895	$ 2,317
Rental income		704
Rent payments receivable in the future		$ 1,087
Number of parcels held for development | Parcel_of_land		2
Subsequent Event [Member]
Property, Plant and Equipment [Line Items]
Gain on sale of land	$ 1,304

GOODWILL AND CORE DEPOSIT INT78

GOODWILL AND CORE DEPOSIT INTANGIBLES - (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Goodwill [Roll Forward]
Goodwill, Balance at beginning of the period	$ 180,776	$ 29,650
LegacyTexas Group, Inc. acquisition		151,126
Disposition of insurance subsidiary goodwill upon the sale of subsidiary operations	(2,217)
Goodwill, Balance at end of the period	178,559	180,776
Core Depoit Intangible [Roll Forward]
Core Deposit Intangible, Balance at beginning of period	1,030	616
LegacyTexas Group, Inc. acquisition		880
Amortization of core deposit intangible	(365)	(466)
Core Deposit Intangible, Balance at end of period	$ 665	$ 1,030

GOODWILL AND CORE DEPOSIT INT79

GOODWILL AND CORE DEPOSIT INTANGIBLES - Estimated Aggregate Future Amortization Expense for Intangible Assets Remaining (Details) $ in Thousands	Dec. 31, 2016USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2,017	$ 263
2,018	156
2,019	101
2,020	73
2,021	48
Thereafter	$ 24

GOODWILL AND CORE DEPOSIT INT80

GOODWILL AND CORE DEPOSIT INTANGIBLES - Narrative (Details)	12 Months Ended
	Dec. 31, 2016
Core Deposits [Member]
Finite-Lived Intangible Assets [Line Items]
Useful life of core deposit intangibles	8 years

DEPOSITS - Narrative (Details)

DEPOSITS - Narrative (Details) - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Restricted Cash and Cash Equivalents Items [Line Items]
FDIC insured amount	$ 250,000
Time deposits, $250,000 or more	951,688,000	$ 503,719,000
Brokered deposits	355,455,000	371,692,000
Deposits of public funds	1,001,820,000	708,723,000
Unsecured customer loans	340,000	$ 1,177,000
Certificates of Deposit [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
FDIC insured amount	50,000,000
Money Market Funds [Member]
Restricted Cash and Cash Equivalents Items [Line Items]
FDIC insured amount	$ 75,000,000

DEPOSITS - Scheduled Maturity o

DEPOSITS - Scheduled Maturity of Time Deposits (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Time Deposits, Fiscal Year Maturity [Abstract]
2,017	$ 992,786
2,018	256,150
2,019	29,019
2,020	22,858
2021 and thereafter	67,091
Time Deposit Maturities, Total	$ 1,367,904	$ 1,027,391
Weighted Average Rate of Time Deposits [Abstract]
2,017	0.73%
2,018	0.99%
2,019	0.98%
2,020	1.39%
2021 and thereafter	1.65%
Weighted Average Interest Rate, Maturities, Total	0.84%

DEPOSITS - Interest Expense on

DEPOSITS - Interest Expense on Deposits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Banking and Thrift [Abstract]
Interest-bearing demand	$ 3,974	$ 3,297	$ 1,653
Savings and money market	7,288	3,644	3,144
Time	9,772	6,186	3,415
Total	$ 21,034	$ 13,127	$ 8,212

BORROWED FUNDS - Schedule of De

BORROWED FUNDS - Schedule of Debt (Details) - USD ($)	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2015	Nov. 30, 2015
Debt Instrument [Line Items]
Federal Home Loan Bank advances	$ 833,682,000		$ 1,439,904,000
Repurchase agreements	86,691,000		83,269,000
CREDIT SUISSE (US) [Member]
Debt Instrument [Line Items]
Repurchase agreements	25,000,000		25,000,000
Maturity Overnight [Member]
Debt Instrument [Line Items]
Repurchase agreements	61,691,000		58,269,000
Legacy Capital Trust III [Member]
Debt Instrument [Line Items]
Junior Subordinated Notes	$ 15,464,000		$ 15,464,000
Federal Home Loan Bank Advances [Member]
Debt Instrument [Line Items]
Federal Home Loan Bank advances, rate	0.71%		0.51%
Federal Home Loan Bank Advances [Member] | Maximum [Member]
Debt Instrument [Line Items]
Federal Home Loan Bank advances, rate	6.00%		6.00%
Subordinated Debt [Member]
Debt Instrument [Line Items]
Debt, rate	5.58%	5.69%	5.50%	5.50%
Subordinated debt	$ 125,000,000	$ 50,000,000	$ 75,000,000	$ 75,000,000
Repurchase Agreements [Member] | Maturity Overnight [Member]
Debt Instrument [Line Items]
Debt, rate	0.15%		0.16%
Repurchase Agreements [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt, rate	3.02%		3.22%
London Interbank Offered Rate (LIBOR) [Member] | Trust III Debentures [Member] | Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Subordinated debt, rate	2.66%		2.21%

BORROWED FUNDS - FHLB Advances

BORROWED FUNDS - FHLB Advances (Details) - Federal Home Loan Bank Advances [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Federal home loan bank, interest rate, minimum	0.71%	0.51%
Variable rate federal home loan bank advances outstanding	$ 800,000
Restructuring prepayment penalty	27	$ 456
Credit available based on collateralized values	1,821,693	1,030,732
Maximum borrowing capacity	3,601,739	3,025,653
Mortgage and Commercial Loans With Federal Home Loan Bank [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Federal home loan bank, collateral pledges	$ 1,877,506	$ 1,461,248
Minimum [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Federal home loan bank, interest rate, minimum	0.46%	0.28%
Maximum [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Federal home loan bank, interest rate, minimum	6.00%	6.00%

BORROWED FUNDS - Repurchase Agr

BORROWED FUNDS - Repurchase Agreement (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Investment Holdings [Line Items]
Repurchase agreements	$ 86,691	$ 83,269
Repurchase Agreements [Member]
Investment Holdings [Line Items]
Term of repurchase agreement	10 years
Variable rate on repurchase agreement	6.25%
Maturity Overnight [Member]
Investment Holdings [Line Items]
Assets sold under agreements to repurchase, market value protection percentage	115.00%
Repurchase agreements	$ 61,691	$ 58,269
Maturity Overnight [Member] | Repurchase Agreements [Member]
Investment Holdings [Line Items]
Interest rate maximum on repurchase agreement	0.15%	0.16%
CREDIT SUISSE (US) [Member]
Investment Holdings [Line Items]
Assets sold under agreements to repurchase, market value protection percentage	112.00%
Repurchase agreements	$ 25,000	$ 25,000
Maximum [Member] | Repurchase Agreements [Member]
Investment Holdings [Line Items]
Interest rate maximum on repurchase agreement	3.02%	3.22%

BORROWED FUNDS - Subordinated D

BORROWED FUNDS - Subordinated Debt and Other Borrowings (Details) - USD ($)	Jan. 01, 2015	Nov. 30, 2015	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Trust preferred securities, purchase accounting adjustments			$ 3,723,000		$ 3,905,000
Long-term debt			1,060,864,000
Borrowing capacity			255,000,000		285,000,000
Federal Reserve Bank [Member]
Debt Instrument [Line Items]
Borrowing capacity			46,725,000		35,632,000
Subordinated Debt [Member]
Debt Instrument [Line Items]
Debt face amount		$ 75,000,000	$ 125,000,000	$ 50,000,000	$ 75,000,000
Debt, rate		5.50%	5.58%	5.69%	5.50%
Redemption price		100.00%
Unamortized discount			$ 2,709,000
Long-term debt			$ 140,464,000
Notes Payable, Other Payables [Member]
Debt Instrument [Line Items]
Long-term debt	$ 8,900,000
London Interbank Offered Rate (LIBOR) [Member] | Subordinated Debt [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		3.89%
Trust III Debentures [Member] | London Interbank Offered Rate (LIBOR) [Member] | Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.70%
Long-term debt, percentage bearing variable interest, percentage rate			2.66%		2.21%
Legacy Capital Trust III [Member]
Debt Instrument [Line Items]
Trust preferred securities, value	$ 15,000,000
Trust preferred securities purchased (in shares)	15,000
Trust preferred securities, liquidation amount (in dollars per share)	$ 1,000
Common stock, value	$ 464,000
Junior Subordinated Notes			$ 15,464,000		$ 15,464,000
Legacy Capital Trust II [Member]
Debt Instrument [Line Items]
Trust preferred securities, value	15,000,000
Common stock, value	$ 464,000

BORROWED FUNDS - Pay Down Sched

BORROWED FUNDS - Pay Down Schedule (Details) $ in Thousands	Dec. 31, 2016USD ($)
Long-term Debt [Line Items]
2,017	$ 677,237
2,018	237,754
2,019	2,314
2,020	931
2,021	856
Thereafter	141,772
Total, Balance	1,060,864
Federal Home Loan Bank Advances [Member]
Long-term Debt [Line Items]
2,017	615,546
2,018	212,754
2,019	2,314
2,020	931
2,021	856
Thereafter	1,308
Total, Balance	833,709
Repurchase Agreements [Member]
Long-term Debt [Line Items]
2,017	61,691
2,018	25,000
2,019	0
2,020	0
2,021	0
Thereafter	0
Total, Balance	86,691
Subordinated Debt [Member]
Long-term Debt [Line Items]
2,017	0
2,018	0
2,019	0
2,020	0
2,021	0
Thereafter	140,464
Total, Balance	$ 140,464

BENEFITS - KSOP 401K (Details)

BENEFITS - KSOP 401K (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2010
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Employee stock ownership plan (ESOP), cash contributions	$ 1,468	$ 2,060
ESOP compensation expense	3,955	5,751	$ 5,557
Employee Stock Ownership Plan [Member]
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Recourse provision minimum				30 years
Net proceeds from long-term debt				$ 15,886
ESOP compensation expense	$ 3,174	4,914	4,725
Common Stock [Member] | Employee Stock Ownership Plan [Member]
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Contributed to ESOP (in shares)				1,588,587
KSOP with 401k Match [Member]
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
401(k) plan, employer matching percentage of qualifying contributions	100.00%
401(k) plan, employer matching contribution of qualifying compensation percent	5.00%
401(k) plan, cost recognized	$ 2,479	$ 2,130	$ 1,283

BENEFITS - Deferred Compensatio

BENEFITS - Deferred Compensation Plan and Bank-Owned Life Insurance (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Other assets	$ 80,397	$ 63,633
Bank-owned life insurance	56,477	55,231
Non Qualified Deferred Comp [Member]
Defined Benefit Plan Disclosure [Line Items]
Deferred compensation accrued liability	3,344	4,086
Non Qualified Deferred Comp [Member] | Life Insurance, Variable Annuity Contracts, and Fixed Annuity Contracts [Member]
Defined Benefit Plan Disclosure [Line Items]
Other assets	$ 3,534	$ 4,272

BENEFITS - ESOP table (Details)

BENEFITS - ESOP table (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Compensation and Retirement Disclosure [Abstract]
Allocated to participants	1,643,294	1,522,883
Unearned	1,245,046	1,365,457
Total ESOP shares	2,888,340	2,888,340
Fair value of unearned shares at December 31 (in USD)	$ 53,612	$ 34,164

SHARE-BASED COMPENSATION - Narr

SHARE-BASED COMPENSATION - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual term	10 years	10 years	10 years
Options, grants in period, weighted average grant date fair value (in dollars per share)	$ 7.77	$ 6.82	$ 7.17
Options, expected forfeiture rate	5.00%
Restricted stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation expense related to non-vested shares	$ 5,398
Weighted-average period	1 year 4 months 24 days
Vested, weighted-average grant date fair value	$ 2,615	$ 3,113
Total restricted shares available for future issuance (in shares)	64,009
Total shares issued under the plan (in shares)	1,409,004
Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation expense related to non-vested shares	$ 7,091
Weighted-average period	2 years 5 months 13 days
Contractual term	10 years
Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized (in shares)	3,370,040
Restricted stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized (in shares)	1,348,016

SHARE-BASED COMPENSATION - Comp

SHARE-BASED COMPENSATION - Compensation Cost Charged to Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Compensation cost charged to income for:
Income tax benefit	$ 2,105	$ 1,917	$ 1,301
Restricted stock [Member]
Compensation cost charged to income for:
Compensation cost	3,477	3,459	2,561
Stock options [Member]
Compensation cost charged to income for:
Compensation cost	$ 2,537	$ 2,018	$ 1,156

SHARE-BASED COMPENSATION - Chan

SHARE-BASED COMPENSATION - Changes in the Nonvested Shares for the Company's Stock Plans (Details) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Time-Vested Restricted Stock [Member]
Shares
Non-vested Shares, Beginning (in shares)	246,461	297,603	381,402
Granted	55,180	80,000	20,000
Vested	(101,465)	(131,142)	(103,799)
Non-vested Shares, Ending (in shares)	200,176	246,461	297,603
Weighted-average grant date fair value ($ per share)
Non-vested Shares, Beginning, Weighted-Average Grant Date Fair Value (in dollars per share)	$ 20.98	$ 20.45	$ 20.39
Granted	29.29	21.23	24.69
Vested	20.70	19.98	20.32
Non-vested Shares, Ending, Weighted-Average Grant Date Fair Value (in dollars per share)	$ 23.79	$ 20.98	$ 20.45
Performance-Based Restricted Stock [Member]
Shares
Non-vested Shares, Beginning (in shares)	61,800	82,400	82,400
Granted	40,200	0	0
Vested	(20,600)	(20,600)	0
Non-vested Shares, Ending (in shares)	81,400	61,800	82,400
Weighted-average grant date fair value ($ per share)
Non-vested Shares, Beginning, Weighted-Average Grant Date Fair Value (in dollars per share)	$ 25.02	$ 23.89	$ 27.45
Granted	29.29	0	0
Vested	25.02	23.89	0
Non-vested Shares, Ending, Weighted-Average Grant Date Fair Value (in dollars per share)	$ 43.06	$ 25.02	$ 23.89

SHARE-BASED COMPENSATION - Unde

SHARE-BASED COMPENSATION - Underlying Assumptions for Fair Value Calculations (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Risk-free interest rate	1.37%	1.80%	2.16%
Expected term of stock options (years)	6 years 3 months 16 days	6 years 2 months 28 days	6 years 2 months 28 days
Expected stock price volatility	32.07%	31.14%	30.96%
Expected dividends	1.93%	1.95%	1.84%

SHARE-BASED COMPENSATION - Summ

SHARE-BASED COMPENSATION - Summary of Activity in the Stock Option Portion of the Plans (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Shares
Beginning (shares)	1,865,750	1,370,873	1,173,618
Granted (shares)	392,838	633,000	328,750
Exercised (shares)	(175,192)	(58,855)	(56,035)
Forfeited (shares)	(75,316)	(79,268)	(75,460)
Ending (shares)	2,008,080	1,865,750	1,370,873	1,173,618
Fully vested and expected to vest (shares)	1,990,524
Exercisable (shares)	719,156
Weighted- Average Exercise Price ($ per share)
Beginning ($ per share)	$ 22.21	$ 20.27	$ 18.16
Granted ($ per share)	29.15	25.66	26.09
Exercised ($ per share)	19.08	16.12	13.66
Forfeited ($ per share)	25.57	20.89	17.63
Ending ($ per share)	23.71	$ 22.21	$ 20.27	$ 18.16
Fully vested and expected to vest ($ per share)	23.68
Exercisable ($ per share)	$ 20.51
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Weighted-Average Remaining Contractual Term, Outstanding	7 years 4 months 24 days	7 years 10 months 8 days	8 years 8 days	8 years 5 months 1 day
Weighted-Average Remaining Contractual Term, Granted	10 years	10 years	10 years
Weighted-Average Remaining Contractual Term, Fully vested and expected to vest	7 years 4 months 19 days
Weighted-Average Remaining Contractual Term, Exercisable	6 years 2 months
Aggregate Intrinsic Value, Outstanding Balance, Beginning	$ 6,401	$ 5,679	$ 10,903
Aggregate Intrinsic Value, Exercised	2,251	644	652
Aggregate Intrinsic Value, Outstanding Balance, Ending	38,850	$ 6,401	$ 5,679	$ 10,903
Aggregate Intrinsic Value, Fully vested and expected to vest	38,585
Aggregate Intrinsic Value, Exercisable	$ 16,218

INCOME TAXES - Expense (Detail

INCOME TAXES - Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Current expense	$ 59,900	$ 38,648	$ 19,073
Deferred expense	(6,798)	(692)	(1,414)
Total income tax expense	$ 53,102	$ 37,956	$ 17,659

INCOME TAXES - Deferred Tax Ass

INCOME TAXES - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets:
Allowance for loan losses	$ 22,602	$ 16,483
Deferred compensation arrangements	1,261	1,536
Self-funded health insurance	241	203
Non-accrual interest	966	632
Restricted stock and stock options	3,132	2,275
Accrued expenses	1,255	715
Fair value mark on purchased loans	2,348	3,838
Net unrealized loss on securities available for sale	1,465	72
Other	2,121	811
Total	35,391	26,565
Deferred tax liabilities:
Depreciation	(336)	(1,011)
Partnerships — CRA-purposed private equity funds	(1,697)	(1,328)
Fair value mark on subordinated debt	(1,303)	(1,367)
Other	(2,824)	(1,819)
Deferred Tax Liabilities, Gross	(6,160)	(5,525)
Net deferred tax asset	$ 29,231	$ 21,040

INCOME TAXES - Effective Tax Ra

INCOME TAXES - Effective Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Federal statutory rate times financial statement income	$ 52,823	$ 38,105	$ 17,128
Effect of:
State taxes, net of federal benefit	267	37	66
Tax credit on CRA-purposed private equity fund	0	0	(58)
Bank-owned life insurance income	(436)	(419)	(220)
Municipal interest income	(1,041)	(1,025)	(772)
ESOP shares released	757	1,207	1,140
One-time merger expenses	0	0	381
Sale of LegacyTexas Insurance Services, Inc.	640	0	0
Other	92	51	(6)
Total income tax expense	$ 53,102	$ 37,956	$ 17,659
Effective Tax Rate	35.18%	34.86%	36.09%

INCOME TAXES - Narrative (Detai

INCOME TAXES - Narrative (Details)	12 Months Ended
	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Federal income tax and state margin tax	36.00%
Federal statutory rate	35.00%

RELATED PARTY TRANSACTIONS - Lo

RELATED PARTY TRANSACTIONS - Loans (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)
Loans, Related Parties [Roll Forward]
Beginning balance	$ 15,365
New loans	21
Effect of changes in composition of related parties	0
Repayments	(49)
Ending balance	$ 15,337

RELATED PARTY TRANSACTIONS - Na

RELATED PARTY TRANSACTIONS - Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Related Party Transactions [Abstract]
Related party deposits	$ 48,761	$ 44,907

REGULATORY CAPITAL MATTERS - Le

REGULATORY CAPITAL MATTERS - Levels and Ratios (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
the Company [Member]
Total risk-based capital
Actual, Amount	$ 910,040	$ 755,689
Actual, Ratio	11.71%	11.58%
Required for Capital Adequacy Purposes, Amount	$ 621,870	$ 522,107
Required for Capital Adequacy Purposes, Ratio	8.00%	8.00%
To Be Well-Capitalized, Amount	$ 777,338	$ 652,634
To Be Well-Capitalized, Ratio	10.00%	10.00%
Tier 1 risk-based capital
Actual, Amount	$ 721,600	$ 635,162
Actual, Ratio	9.28%	9.73%
Required for Capital Adequacy Purposes, Amount	$ 466,403	$ 391,580
Required for Capital Adequacy Purposes, Ratio	6.00%	6.00%
To Be Well-Capitalized, Amount	$ 466,403	$ 391,580
To Be Well-Capitalized, Ratio	6.00%	6.00%
Common equity tier 1 risk-based capital
Actual, Amount	$ 709,858	$ 623,604
Actual, Ratio	9.13%	9.56%
Required for Capital Adequacy Purposes, Amount	$ 349,802	$ 293,685
Required for Capital Adequacy Purposes, Ratio	4.50%	4.50%
Tier 1 leverage
Actual, Amount	$ 721,600	$ 635,162
Actual, Ratio	8.73%	9.46%
Required for Capital Adequacy Purposes, Amount	$ 330,782	$ 268,430
Required for Capital Adequacy Purposes, Ratio	4.00%	4.00%
the Bank [Member]
Total risk-based capital
Actual, Amount	$ 869,523	$ 691,554
Actual, Ratio	11.19%	10.60%
Required for Capital Adequacy Purposes, Amount	$ 621,840	$ 522,116
Required for Capital Adequacy Purposes, Ratio	8.00%	8.00%
To Be Well-Capitalized, Amount	$ 777,300	$ 652,645
To Be Well-Capitalized, Ratio	10.00%	10.00%
Tier 1 risk-based capital
Actual, Amount	$ 803,374	$ 644,461
Actual, Ratio	10.34%	9.87%
Required for Capital Adequacy Purposes, Amount	$ 466,380	$ 391,587
Required for Capital Adequacy Purposes, Ratio	6.00%	6.00%
To Be Well-Capitalized, Amount	$ 621,840	$ 522,116
To Be Well-Capitalized, Ratio	8.00%	8.00%
Common equity tier 1 risk-based capital
Actual, Amount	$ 803,374	$ 644,461
Actual, Ratio	10.34%	9.87%
Required for Capital Adequacy Purposes, Amount	$ 349,785	$ 293,690
Required for Capital Adequacy Purposes, Ratio	4.50%	4.50%
To Be Well-Capitalized, Amount	$ 505,245	$ 424,219
To Be Well-Capitalized, Ratio	6.50%	6.50%
Tier 1 leverage
Actual, Amount	$ 803,374	$ 644,461
Actual, Ratio	9.71%	9.61%
Required for Capital Adequacy Purposes, Amount	$ 330,873	$ 268,273
Required for Capital Adequacy Purposes, Ratio	4.00%	4.00%
To Be Well-Capitalized, Amount	$ 413,591	$ 335,341
To Be Well-Capitalized, Ratio	5.00%	5.00%

COMMITMENTS AND CONTINGENT L104

COMMITMENTS AND CONTINGENT LIABILITIES - Table (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Unused Capacity on Warehouse Purchase Program Loans [Member]
Other Commitments [Line Items]
Fair value disclosure, off-balance sheet risks, amount, liability	$ 892,659	$ 476,281
Commitments [Member]
Other Commitments [Line Items]
Total unused commitments/capacity	2,564,385	1,706,889
Commitments to Extend Credit [Member]
Other Commitments [Line Items]
Fair value disclosure, off-balance sheet risks, amount, liability	1,642,528	1,211,964
Unused lines of Credit [Member] | Standby letters of credit [Member]
Other Commitments [Line Items]
Fair value disclosure, off-balance sheet risks, amount, liability	$ 29,198	$ 18,644

COMMITMENTS AND CONTINGENT L105

COMMITMENTS AND CONTINGENT LIABILITIES - Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Other Commitments [Line Items]
Overdraft protection	$ 85,709	$ 87,077
Unfunded commitments	2,080
Investment in Community Reinvestment Act private equity funds	$ 11,168
Investment in Community Reinvestment Act private equity funds, ownership	5.30%
Other Liabilities [Member]
Other Commitments [Line Items]
Mortgage repurchase liability	$ 143	147
Federal Home Loan Bank Certificates and Obligations (FHLB) [Member]
Other Commitments [Line Items]
Letters of credit pledged as collateral	946,338
Financial Guarantee [Member]
Other Commitments [Line Items]
Credit card guarantees	3,335	$ 1,028
Reserve for Off-balance Sheet Activities [Member] | Other Liabilities [Member]
Other Commitments [Line Items]
Valuation reserves	$ 1,500

PARENT COMPANY ONLY CONDENSE106

PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION - Condensed Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
ASSETS
Cash on deposit at subsidiary	$ 59,823	$ 53,847
Total assets	8,362,255	7,691,940
LIABILITIES AND SHAREHOLDERS’ EQUITY
Long-term Debt	1,060,864
Other liabilities	57,009	52,988
Total liabilities and shareholders’ equity	8,362,255	7,691,940
the Company [Member]
ASSETS
Cash on deposit at subsidiary	16,962	42,980
Investment in banking subsidiary	978,880	824,933
Receivable from banking subsidiary	10,317	7,456
ESOP note receivable and other assets	13,999	14,498
Total assets	1,020,158	889,867
LIABILITIES AND SHAREHOLDERS’ EQUITY
Long-term Debt	134,032	84,992
Other liabilities	761	799
Shareholders’ equity	885,365	804,076
Total liabilities and shareholders’ equity	$ 1,020,158	$ 889,867

PARENT COMPANY ONLY CONDENSE107

PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION - Condensed Statements of Income (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Condensed Financial Statements, Captions [Line Items]
Interest expense	$ 10,413	$ 9,431	$ 7,982	$ 7,257	$ 5,840	$ 5,337	$ 5,146	$ 5,292	$ 35,083	$ 21,615	$ 16,640
Income before income tax expense									150,923	108,872	48,937
Income tax benefit									(53,102)	(37,956)	(17,659)
Net income									97,821	70,916	31,278
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Cash dividends from subsidiary									0	24,500	19,187
Excess of earnings over dividend from subsidiary									103,572	48,677	20,044
Interest income on ESOP loan									487	565	633
Interest income on subordinated debt									11	17	0
Other income									0	5	0
Income (Loss) from Subsidiaries, before Tax									104,070	73,764	39,864
Interest expense									6,040	1,046	0
Operating expenses									3,236	3,009	13,036
Income before income tax expense									94,794	69,709	26,828
Income tax benefit									3,027	1,207	4,450
Net income									$ 97,821	$ 70,916	$ 31,278

PARENT COMPANY ONLY CONDENSE108

PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION - Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Condensed Financial Statements, Captions [Line Items]
Net income	$ 97,821	$ 70,916	$ 31,278
Adjustments to reconcile net income to net cash from operating activities:
Net change in other assets	(2,947)	8,444	117
Net change in other liabilities	5,913	(16,250)	(2,571)
Net cash provided by operating activities	132,448	89,202	52,024
Cash flows from investing activities
Cash received in excess of cash paid for acquisition of LegacyTexas Group, Inc.	0	128,598	0
Net cash (used in) investing activities	(1,019,429)	(1,131,445)	(606,856)
Cash flows from financing activities
Repayments of borrowings	(24,929)	(32,953)	0
Share repurchase	0	(7,989)	0
Payment of dividends	(27,676)	(25,747)	(19,187)
Net cash provided by financing activities	560,554	1,525,861	598,879
Net change in cash and cash equivalents	(326,427)	483,618	44,047
Beginning cash and cash equivalents	615,639	132,021	87,974
Ending cash and cash equivalents	289,212	615,639	132,021
the Company [Member]
Condensed Financial Statements, Captions [Line Items]
Net income	97,821	70,916	31,278
Adjustments to reconcile net income to net cash from operating activities:
Excess of earnings over dividend from subsidiary	(103,572)	(48,677)	(20,044)
Amortization	530	171	0
Activity in share-based compensation plans	3,152	3,068	3,096
Net change in intercompany receivable	0	0	(31,395)
Net change in other assets	(481)	6,931	(1,820)
Net change in other liabilities	(38)	(14,544)	4,134
Net cash provided by operating activities	(2,588)	17,865	(14,751)
Cash flows from investing activities
Capital contribution (to) from subsidiary	(49,000)	(40,000)	31,395
Cash received in excess of cash paid for acquisition of LegacyTexas Group, Inc.	0	201	0
Payments received on ESOP notes receivable	981	1,495	1,427
Net cash (used in) investing activities	(48,019)	(38,304)	32,822
Cash flows from financing activities
Proceeds from borrowings	73,439	73,407	0
Repayments of borrowings	(24,929)	(24,364)	0
Share repurchase	0	(7,989)	0
Net issuance of common stock under employee stock plans	3,755	1,284	1,085
Payment of dividends	(27,676)	(25,747)	(19,187)
Net cash provided by financing activities	24,589	16,591	(18,102)
Net change in cash and cash equivalents	(26,018)	(3,848)	(31)
Beginning cash and cash equivalents	42,980	46,828	46,859
Ending cash and cash equivalents	$ 16,962	$ 42,980	$ 46,828

QUARTERLY FINANCIAL DATA (Un109

QUARTERLY FINANCIAL DATA (Unaudited) - (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Interest Income	$ 84,497	$ 82,911	$ 77,336	$ 72,608	$ 69,582	$ 66,525	$ 64,967	$ 61,618	$ 317,352	$ 262,692	$ 149,647
Interest Expense	10,413	9,431	7,982	7,257	5,840	5,337	5,146	5,292	35,083	21,615	16,640
Net interest income	74,084	73,480	69,354	65,351	63,742	61,188	59,821	56,326	282,269	241,077	133,007
Provision for Credit Losses	7,833	3,467	6,800	8,800	11,200	7,515	3,750	3,000	25,400	25,465	6,721
Securities Gains and (Losses)	(6)	(3)	65	0	17	(25)	0	211
Net income	$ 25,305	$ 27,217	$ 23,217	$ 22,082	$ 16,446	$ 17,895	$ 20,251	$ 16,324	$ 97,821	$ 70,916	$ 31,278
Basic earnings per common share (in dollars per share)	$ 0.54	$ 0.59	$ 0.50	$ 0.48	$ 0.36	$ 0.39	$ 0.44	$ 0.35	$ 2.11	$ 1.54	$ 0.82
Diluted earnings per common share (in dollars per share)	$ 0.54	$ 0.58	$ 0.50	$ 0.48	$ 0.35	$ 0.38	$ 0.44	$ 0.35	$ 2.09	$ 1.53	$ 0.81