Southside Bancshares (SBSI) 10-K 8 Mar 16 2015 FY Annual report Financial data

DOCUMENT AND ENTITY INFORMATION

DOCUMENT AND ENTITY INFORMATION - USD ($)	12 Months Ended
	Dec. 31, 2015	Mar. 07, 2016	Jun. 30, 2015
Entity Information [Line Items]
Entity Registrant Name	SOUTHSIDE BANCSHARES INC
Entity Central Index Key	705,432
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Entity Public Float			$ 681,597,633
Entity Common Stock Shares Outstanding		24,974,348
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	FY
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2015

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
ASSETS
Cash and due from banks		$ 54,288	$ 64,001
Interest bearing deposits		26,687	20,654
Total cash and cash equivalents		80,975	84,655
Investment securities:
Available for sale, at estimated fair value		366,639	306,706
Held to maturity, at carrying value (estimated fair value of $397,194 and $400,248, respectively)		385,496	388,823
Mortgage-backed securities:
Available for sale, at estimated fair value		1,093,853	1,142,002
Held to maturity, at carrying value (estimated fair value of $402,569 and $261,339, respectively)		398,800	253,496
FHLB stock, at cost		51,047	39,942
Other investments, at cost		5,462	3,929
Loans held for sale		3,811	2,899
Loans:
Loans	[1]	2,431,753	2,181,133
Less: Allowance for loan losses		(19,736)	(13,292)
Net loans		2,412,017	2,167,841
Premises and equipment, net		107,929	112,860
Goodwill		91,520	91,372
Other intangible assets, net		6,548	8,844
Interest receivable		22,700	22,436
Deferred tax asset, net		19,903	12,707
Unsettled trades to sell securities		9,343	57,202
Bank owned life insurance		95,080	92,384
Other assets		10,953	19,163
TOTAL ASSETS		5,162,076	4,807,261
Deposits:
Noninterest bearing		672,470	661,014
Interest bearing		2,782,937	2,713,403
Total deposits		3,455,407	3,374,417
Short-term obligations:
Federal funds purchased and repurchase agreements		2,429	4,237
FHLB advances		645,407	297,368
Total short-term obligations		647,836	301,605
Long-term obligations:
FHLB advances		502,281	600,052
Long-term debt		60,311	60,311
Total long-term obligations		562,592	660,363
Unsettled trades to purchase securities		19,350	5,982
Other liabilities		32,829	39,651
TOTAL LIABILITIES		$ 4,718,014	$ 4,382,018
Off-Balance-Sheet Arrangements, Commitments and Contingencies
Shareholders' equity:
Common stock: ($1.25 par, 40,000,000 shares authorized, 27,865,798 shares issued in 2015 and 26,578,127 shares issued in 2014)		$ 34,832	$ 33,223
Paid-in capital		424,078	389,886
Retained earnings		41,527	55,396
Treasury stock (2,469,638 shares at cost)		(37,692)	(37,692)
Accumulated other comprehensive loss		(18,683)	(15,570)
TOTAL SHAREHOLDERS' EQUITY		444,062	425,243
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY		$ 5,162,076	$ 4,807,261
[1]	Includes approximately $581.1 million and $763.3 million as of December 31, 2015 and 2014, respectively, of loans acquired with the Omni acquisition on December 17, 2014. These loans were measured at fair value at the acquisition date with no carryover of allowance for loan loss. The allowance for loan loss recorded on acquired loans for the year ended December 31, 2015 totaled $629,000.

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Held to Maturity, Investment Securities, fair value	$ 397,194	$ 400,248
Held to Maturity, Mortgage Backed Securities, fair value	$ 402,569	$ 261,339
Common stock, par value (in dollars per share)	$ 1.25	$ 1.25
Common stock, shares authorized (in shares)	40,000,000	40,000,000
Common stock, shares issued (in shares)	27,865,798	26,578,127
Treasury stock, (in shares)	2,469,638	2,469,638

CONSOLIDATED STATEMENTS OF INCO

CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Interest income
Loans	$ 96,417	$ 70,598	$ 72,910
Investment securities – taxable	1,587	615	799
Investment securities – tax-exempt	22,468	24,038	25,483
Mortgage-backed securities	33,661	28,207	20,085
FHLB stock and other investments	298	181	182
Other interest earning assets	101	139	143
Total interest income	154,532	123,778	119,602
Interest expense
Deposits	10,162	7,953	8,179
Short-term obligations	1,250	624	1,875
Long-term obligations	8,442	8,379	7,914
Total interest expense	19,854	16,956	17,968
Net interest income	134,678	106,822	101,634
Provision for loan losses	8,343	14,938	8,879
Net interest income after provision for loan losses	126,335	91,884	92,755
Noninterest income
Deposit services	20,112	15,280	15,560
Net gain on sale of securities available for sale	3,660	2,830	8,472
Impairment of investment in SFG Finance, LLC	0	(2,755)	0
Gain on sale of loans	2,082	323	770
Trust income	3,419	3,145	3,024
Bank owned life insurance income	2,623	1,334	3,122
Brokerage services	2,206	1,308	1,157
Other	3,793	3,024	3,140
Total noninterest income	37,895	24,489	35,245
Noninterest expense
Salaries and employee benefits	67,221	60,821	52,054
Occupancy expense	12,883	7,259	7,539
Advertising, travel & entertainment	2,708	2,219	2,642
ATM and debit card expense	3,132	1,331	1,328
Professional fees	3,877	7,827	2,782
Software and data processing expense	3,858	4,629	2,018
Telephone and communications	1,978	1,222	1,529
FDIC insurance	2,510	1,765	1,713
FHLB prepayment fees	0	539	1,048
Other	14,787	10,092	9,060
Total noninterest expense	112,954	97,704	81,713
Income before income tax expense	51,276	18,669	46,287
Income tax expense (benefit)	7,279	(2,164)	5,097
Net income	$ 43,997	$ 20,833	$ 41,190
Earnings per common share - basic (in dollars per share)	$ 1.74	$ 1.04	$ 2.09
Earnings per common share - diluted (in dollars per share)	1.73	1.04	2.09
Dividends paid on common stock (in dollars per share)	$ 1	$ 0.96	$ 0.91

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net Income	$ 43,997	$ 20,833	$ 41,190
Other comprehensive (loss) income:
Net unrealized holding (losses) gains on available for sale securities during the period	(7,235)	24,338	(50,518)
Change in net unrealized loss on securities transferred to held to maturity	930	1,405	471
Noncredit portion of other-than-temporary impairment losses on the AFS securities	0	0	(10)
Reclassification adjustment for gain on sale of available for sale securities, included in net income	(3,660)	(2,830)	(8,472)
Reclassification of other-than-temporary impairment charges on available for sale securities, included in net income	0	0	(42)
Amortization of net actuarial loss, included in net periodic benefit cost	2,448	1,042	2,787
Amortization of prior service credit, included in net periodic benefit cost	(16)	(14)	(43)
Effect of settlement recognition	(62)	0	0
Prior service cost adjustment due to plan amendments	0	43	(357)
Change in net actuarial gain (loss)	2,806	(15,574)	19,215
Other comprehensive (loss) income, before tax	(4,789)	8,410	(36,885)
Income tax benefit (expense) related to other items of comprehensive income	1,676	(2,943)	12,910
Net current-period other comprehensive (loss) income, net of tax	(3,113)	5,467	(23,975)
Comprehensive income	$ 40,884	$ 26,300	$ 17,215

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands	Total	Common Stock	Paid In Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income (Loss)
Balance at Dec. 31, 2012	$ 257,763	$ 24,308	$ 195,602	$ 70,708	$ (35,793)	$ 2,938
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	41,190			41,190
Other comprehensive income (loss)	(23,975)					(23,975)
Issuance of common stock (49,908 shares in 2015, 40,142 shares in 2014, and 57,675 shares in 2013)	1,396	72	1,324
Purchase of common stock (90,300 shares)	(1,899)				(1,899)
Stock compensation expense	911		911
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net	65		65
Net issuance of common stock under employee stock plans	155	38	194	(77)
Cash dividends paid on common stock ($1.00 per share in 2015, $0.96 per share in 2014, and $0.91 per share in 2013)	(16,088)			(16,088)
Stock dividend declared	0	1,065	15,995	(17,060)
Balance at Dec. 31, 2013	259,518	25,483	214,091	78,673	(37,692)	(21,037)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	20,833			20,833
Other comprehensive income (loss)	5,467					5,467
Issuance of common stock (49,908 shares in 2015, 40,142 shares in 2014, and 57,675 shares in 2013)	1,213	50	1,163
Net issuance of common stock in connection with the acquisition of OmniAmerican Bancorp, Inc. (5,168,138 shares)	151,292	6,460	144,832
Stock compensation expense	1,086		1,086
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net	(76)		(76)
Net issuance of common stock under employee stock plans	1,074	106	1,094	(126)
Cash dividends paid on common stock ($1.00 per share in 2015, $0.96 per share in 2014, and $0.91 per share in 2013)	(17,919)			(17,919)
Impairment of investment in SFG Finance, LLC.	2,755		2,755
Stock dividend declared	0	1,124	24,941	(26,065)
Balance at Dec. 31, 2014	425,243	33,223	389,886	55,396	(37,692)	(15,570)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	43,997			43,997
Other comprehensive income (loss)	(3,113)					(3,113)
Issuance of common stock (49,908 shares in 2015, 40,142 shares in 2014, and 57,675 shares in 2013)	1,370	62	1,308
Stock compensation expense	1,395
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net	75		75
Net issuance of common stock under employee stock plans	166	35	251	(120)
Cash dividends paid on common stock ($1.00 per share in 2015, $0.96 per share in 2014, and $0.91 per share in 2013)	(25,071)			(25,071)
Stock dividend declared	0	1,512	31,163	(32,675)
Balance at Dec. 31, 2015	$ 444,062	$ 34,832	$ 424,078	$ 41,527	$ (37,692)	$ (18,683)

CONSOLIDATED STATEMENTS OF CHA7

CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Stockholders' Equity [Abstract]
Issuance of common stock (in shares)	49,908	40,142	57,675
Dividends paid on common stock (in dollars per share)	$ 1	$ 0.96	$ 0.91
Purchase of common stock (in shares)	0	0	90,300
Net issuance of common stock in connection with the acquisition of OmniAmerican Bancorp, Inc.		5,168,138

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOW $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)
OPERATING ACTIVITIES
Net Income	$ 43,997	$ 20,833	$ 41,190
Adjustments to reconcile net income to net cash provided by operations:
Depreciation and net amortization	8,624	3,458	3,844
Accretion of loan (discounts) premium amortization, net	21,978	18,522	28,147
Accretion of loan (discounts) premium amortization, net	2,746	1,343	4,432
Provision for loan losses	8,343	14,938	8,879
Stock compensation expense	1,395	1,086	911
Deferred tax benefit	(3,392)	(925)	(1,386)
Tax benefit related to stock awards	(75)	72	(65)
Gain on sale of loans	2,082	323	770
Net gain on sale of securities available for sale	(3,660)	(2,830)	(8,472)
Impairment of investment in SFG Finance, LLC.	0	2,755	0
Net loss on premises and equipment	584	14	8
Gross proceeds from sales of loans held for sale	70,014	11,007	25,509
Gross originations of loans held for sale	70,926	13,007	22,059
Net loss on other real estate owned	430	137	41
Net change in:
Interest receivable	(264)	2,512	(3,037)
Other assets	325	(5,573)	(9,310)
Interest payable	129	(99)	(444)
Other liabilities	(1,775)	4,477	182
Net cash provided by operating activities	72,981	56,034	59,506
Securities held to maturity:
Purchases	(98,556)	0	(140,861)
Maturities, calls and principal repayments	23,322	21,889	168,673
Securities available for sale:
Purchases	(984,725)	(803,163)	(1,499,307)
Sales	660,092	650,391	826,735
Maturities, calls and principal repayments	278,995	272,073	379,661
Proceeds from redemption of FHLB stock	8,603	12,872	5,819
Purchases of FHLB stock and other investments	(19,850)	(4,915)	(11,995)
Net loans originated	(251,465)	(158,572)	(99,446)
Proceeds from sale of SFG loans	0	67,575	0
Net cash paid for acquisition	0	(127,020)	0
Purchases of premises and equipment	(3,765)	(5,162)	(5,662)
Proceeds from sales of premises and equipment	26	8	0
Proceeds on bank owned life insurance	0	0	4,165
Proceeds from sales of other real estate owned	640	535	480
Proceeds from sales of repossessed assets	2,274	6,199	3,935
Net cash used in investing activities	(384,409)	(67,290)	(367,803)
FINANCING ACTIVITIES:
Net change in deposits	82,251	45,253	175,882
Net (decrease) increase in federal funds purchased and repurchase agreements	(1,808)	1,378	(125)
Proceeds from FHLB advances	23,022,132	7,102,277	20,739,951
Repayment of FHLB advances	(22,771,367)	(7,091,125)	(20,687,239)
Tax benefit related to stock awards	75	(72)	65
Net issuance of common stock under employee stock plan	166	1,074	155
Purchase of common stock	0	0	(1,899)
Proceeds from the issuance of common stock	1,370	1,213	1,396
Cash dividends paid	(25,071)	(17,919)	(16,088)
Payments for other financing activities	0	(599)	0
Net cash provided by financing activities	307,748	41,480	212,098
Net (decrease) increase in cash and cash equivalents	(3,680)	30,224	(96,199)
Cash and cash equivalents at beginning of period	84,655	54,431	150,630
Cash and cash equivalents at end of period	80,975	84,655	54,431
SUPPLEMENTAL DISCLOSURES FOR CASH FLOW INFORMATION:
Interest paid	19,725	17,055	18,412
Income taxes paid	8,500	4,300	4,000
SUPPLEMENTAL DISCLOSURES OF NONCASH INVESTING AND FINANCING ACTIVITIES:
Loans transferred to other repossessed assets and real estate through foreclosure	1,706	5,211	5,793
Transfer of available for sale securities to held to maturity securities	57,724	0	452,884
Adjustment to pension liability	(5,176)	14,503	(21,602)
5% stock dividend	32,675	26,065	17,060
Unsettled trades to purchase securities	(19,350)	(5,982)	(973)
Unsettled trades to sell securities	9,343	57,202	3,933
Common stock issued in acquisition	$ 0	$ 151,891	$ 0

CONSOLIDATED STATEMENTS OF CAS9

CONSOLIDATED STATEMENTS OF CASH FLOW (Parenthetical)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Cash Flows [Abstract]
Stock dividend, percentage of common stock	5.00%	5.00%	5.00%

SUMMARY OF SIGNIFICANT ACCOUNTI

SUMMARY OF SIGNIFICANT ACCOUNTING AND REPORTING POLICIES	12 Months Ended
	Dec. 31, 2015
Accounting Policies [Abstract]
SUMMARY OF SIGNIFICANT ACCOUNTING AND REPORTING POLICIES	SUMMARY OF SIGNIFICANT ACCOUNTING AND REPORTING POLICIES Organization . Southside Bancshares, Inc., incorporated in Texas in 1982, is a bank holding company for Southside Bank, a Texas state bank headquartered in Tyler, Texas that was formed in 1960. We operate through 60 banking centers, 18 of which are located in grocery stores. We consider our primary market areas to be East Texas, the greater Fort Worth, Texas area and the greater Austin, Texas area. We are a community-focused financial institution that offers a full range of financial services to individuals, businesses, municipal entities, and nonprofit organizations in the communities that we serve. These services include consumer and commercial loans, deposit accounts, trust services, safe deposit services and brokerage services. Basis of Presentation and Consolidation . The consolidated financial statements are prepared in conformity with U.S. generally accepted accounting principles (“GAAP”) and include the accounts of Southside Bancshares, Inc. (the “Company”), and its wholly-owned subsidiaries, Southside Bank (“Southside Bank” or “the Bank”), OmniAmerican Bancorp (“Omni”), SFG Finance, LLC (formerly Southside Financial Group, LLC) which was a wholly-owned subsidiary of the Bank and was dissolved in April 2015, and the nonbank subsidiaries. All significant intercompany accounts and transactions are eliminated in consolidation. On December 17, 2014, we acquired OmniAmerican Bancorp, Inc., a bank holding company traded on the NASDAQ Global Market and the holding company for OmniAmerican Bank, a federal savings association, headquartered in Fort Worth, Texas. See "Note 2 - Acquisition" in the accompanying notes to consolidated financial statements included elsewhere in this report. We determine if we have a controlling financial interest in an entity by first evaluating whether the entity is a voting interest entity or a variable interest entity (“VIE”) under GAAP. Voting interest entities are entities in which the total equity investment at risk is sufficient to enable the entity to finance itself independently and provides the equity holders with the obligation to absorb losses, the right to receive residual returns and the right to make decisions about the entity’s activities. We consolidate voting interest entities in which we have all, or at least a majority of, the voting interest. As defined in applicable accounting standards, VIEs are entities that lack one or more of the characteristics of a voting interest entity. A controlling financial interest in a VIE is present when an enterprise has both the power to direct the activities of the VIE that most significantly impact the VIEs economic performance and an obligation to absorb losses or the right to receive benefits that could potentially be significant to the VIE. The enterprise with a controlling financial interest, known as the primary beneficiary, consolidates the VIE. Use of Estimates . In preparing consolidated financial statements in conformity with GAAP, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the balance sheet and reported amounts of revenues and expenses during the reporting period. These estimates are subjective in nature and involve matters of judgment. Actual results could differ from these estimates. Material estimates that are particularly susceptible to significant change in the near term relate to the determination of the allowance for loan losses, assumptions used in the defined benefit plan and the fair values of financial instruments. The status of contingencies are particularly subject to change and significant assumptions used in periodic evaluation of securities for other-than-temporary impairment. Certain prior-period amounts have been reclassified to conform to the current period presentation. Segment Information . Operating segments are components of a business about which separate financial information is available and that are evaluated regularly by the chief operating decision-maker in deciding how to allocate resources and assess performance. Our chief operating decision-maker uses consolidated results to make operating and strategic decisions. Therefore, we have determined that our business is conducted in one reportable segment. Stock Dividend . On April 13, 2015 , our board of directors declared a 5% stock dividend to common stock shareholders of record as of April 27, 2015 , payable on May 14, 2015 . On March 20, 2014 , our board of directors declared a 5% stock dividend to common stock shareholders of record as of April 10, 2014 , payable on May 1, 2014 . All share data for all periods presented has been adjusted to give retroactive recognition to these stock dividends. Business Combinations. Business combinations are accounted for using the acquisition method of accounting. Under this accounting method, the acquired company's net assets are recorded at fair value on the date of acquisition, and the results of operations of the acquired company are combined with our results from that date forward. Costs related to the acquisition are expensed as incurred. The difference between the purchase price and the fair value of the net assets acquired (including intangible assets with finite lives) is recorded as goodwill. The accounting policy for goodwill and intangible assets is summarized in this note under the heading “Goodwill and Other Intangibles.” Acquired loans (non-impaired and impaired) are initially measured at fair value as of the acquisition date. The fair value estimates for acquired loans are based on the estimate of expected cash flows, both principal and interest and prepayments, discounted at prevailing market interest rates. Credit discounts representing the principal losses expected over the life of the loan are also a component of the initial fair value; therefore, an allowance for loan losses is not recorded at the acquisition date. We evaluate acquired loans for impairment in accordance with the provisions of ASC 310-30, “Loans and Debt Securities Acquired with Deteriorated Credit Quality” (“ASC 310-30”). Acquired loans are considered impaired if there is evidence of credit deterioration since origination and if it is probable at time of acquisition that all contractually required payments will not be collected. Expected cash flows at the acquisition date in excess of the fair value of the loans is referred to as the accretable yield and recorded as interest income over the life of the loans. Acquired impaired loans are not classified as nonaccrual or nonperforming as they are considered to be performing under the provisions of ASC 310-30. Subsequent to the acquisition date, increases in expected cash flows will generally result in a recovery of any previously recorded allowance for loan loss, to the extent applicable, and/or a reclassification from the nonaccretable difference to accretable yield, which will be recognized prospectively. The present value of any decreases in expected cash flows after the acquisition date will generally result in an impairment charge recorded as a provision for loan losses, resulting in an increase to the allowance for loan loss. For acquired non-impaired loans, the difference between the acquisition date fair value and the contractual amounts due at the acquisition date represents the fair value adjustment. Fair value adjustments may be discounts (or premiums) to a loan's cost basis and are accreted (or amortized) to interest income over the loan's remaining contractual life using the level yield method. Cash Equivalents . Cash equivalents, for purposes of reporting cash flow, include cash, amounts due from banks and federal funds sold that have an initial maturity of less than 90 days. We maintain deposits with other 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 we are not exposed to any significant credit risks on cash and cash equivalents. Cash on hand or on deposit with the Federal Reserve Bank of $19.4 million and $13.4 million was required to meet regulatory reserves and clearing requirements at December 31, 2015 and 2014 , respectively. Basic and Diluted Earnings per Common Share . Basic earnings per common share is based on net income divided by the weighted-average number of common shares outstanding during the period. Diluted earnings per common share include the dilutive effect of stock options granted 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 Share.” Comprehensive Income . Comprehensive income includes all changes in shareholders’ equity during a period, except those resulting from transactions with shareholders. Besides net income, other components of comprehensive income include the after tax effect of changes in the fair value of securities available for sale, changes in the funded status of defined benefit retirement plans and the noncredit portion of other-than-temporary impairment. Comprehensive income is reported in the accompanying consolidated statements of changes in shareholders’ equity and in “Note 4 - Accumulated Other Comprehensive (Loss) Income.” Loans . All loans are stated at principal outstanding net of unearned discount and other deferred expenses or fees. Interest income on loans is recognized using the level yield method or simple interest method. Loans receivable that management has the intent and ability to hold for the foreseeable future or until maturity or pay-off are reported at their outstanding principal adjusted for any charge-offs, the allowance for loan losses, and any unamortized deferred fees or costs on originated loans and unamortized premiums or discounts on purchased loans. A loan is considered impaired, based on current information and events, if it is probable that we will be unable to collect the scheduled payments of principal or interest when due according to the contractual terms of the loan agreement. Substantially all of our impaired loans are collateral-dependent, and as such, are measured for impairment based on the fair value of the collateral. Loans Held For Sale . Loans originated and intended for sale in the secondary market are carried at the lower of aggregate cost or fair value, as determined by aggregate outstanding commitments from investors or current investor yield requirements. Net unrealized losses are recognized through a valuation allowance by charges to income. Gains or losses on sales of mortgage loans are recognized based on the difference between the selling price and the carrying value of the related mortgage loans sold. Loan Fees . We treat loan fees, net of direct costs, as an adjustment to the yield of the related loan over its term. Allowance for Loan Losses . An allowance for loan losses is provided through charges to income in the form of a provision for loan losses. Loans which management believes are uncollectible are charged against this account with subsequent recoveries, if any, credited to the account. The amount of the allowance for loan losses is determined by management's evaluation of the quality and inherent risks in the loan portfolio, economic conditions and other factors which warrant current recognition. Nonaccrual Loans . A loan is placed on nonaccrual when principal or interest is contractually past due 90 days or more unless, in the determination of management, the principal and interest on the loan are well collateralized and in the process of collection. In addition, a loan is placed on nonaccrual when, in the opinion of management, the future collectability of interest and principal is not expected. When classified as nonaccrual, accrued interest receivable on the loan is reversed and the future accrual of interest is suspended. Payments of contractual interest are recognized as income only to the extent that full recovery of the principal balance of the loan is reasonably certain. Other Real Estate Owned and Foreclosed Assets . Other Real Estate Owned (“OREO”) includes real estate acquired in full or partial settlement of loan obligations. OREO is initially carried at the fair value of the collateral net of estimated selling costs. Prior to foreclosure, the recorded amount of the loan is written down, if necessary, to the appraised fair value of the real estate to be acquired, less selling costs, by charging the allowance for loan losses. Any subsequent reduction in fair value net of estimated selling costs is charged to noninterest expense. Costs of maintaining and operating foreclosed properties are expensed as incurred and included in other expense in our income statement. Expenditures to complete or improve foreclosed properties are capitalized only if expected to be recovered; otherwise, they are expensed. Other foreclosed assets are held for sale and are initially recorded at fair value less estimated selling costs at the date of foreclosure, by charging the allowance for loan losses. Subsequent to foreclosure, valuations are periodically performed by management and the assets are carried at the lower of carrying amount or fair value less costs to sell. Foreclosed assets are included in other assets in the accompanying consolidated balance sheets. Expenses from operations and changes in the valuation allowance are included in noninterest expense. Securities . We use the specific identification method to determine the basis for computing realized gain or loss. We account for debt and equity securities as follows: Held to Maturity (“HTM”). Debt securities that management has the positive intent and ability to hold until maturity are classified as HTM and are carried at their remaining unpaid principal balance, net of unamortized premiums or unaccreted discounts. Available for Sale (“AFS”). Debt and equity securities that will be held for indefinite periods of time, including securities that may be sold in response to changes in market interest or prepayment rates, needs for liquidity and changes in the availability of and the yield of alternative investments are classified as AFS. These assets are carried at fair value with changes recorded in other comprehensive income. Fair value is determined using quoted market prices as of the close of business on the balance sheet date. If quoted market prices are not available, fair values are based on quoted market prices for similar securities or estimates from independent pricing services. Unrealized gains and losses on AFS securities are excluded from earnings and reported net of tax in Accumulated Other Comprehensive Income until realized. Declines in the fair value of securities below their cost are reflected in earnings as realized losses to the extent the impairment is deemed to be other-than-temporary credit losses. The amount of the impairment related to other factors is recognized in other comprehensive income unless there is no ability or intent to hold to recovery. Premiums are amortized and discounts are accreted to maturity, or in the case of mortgage-backed securities (“MBS”), over the estimated life of the security, using the level yield interest method. Declines in the fair value of HTM and AFS securities below their cost that are deemed to be other-than-temporary are reflected in earnings as realized losses. In estimating other-than-temporary impairment losses, we consider (1) the length of time and the extent to which the fair value has been less than cost, (2) the financial condition and near-term prospects of the issuer, and (3) our intent and ability to retain our investment in the issuer for a period of time sufficient to allow for any anticipated recovery in fair value. Gains and losses on the sale of securities are recorded in the month of the trade date and are determined using the specific identification method. Securities with Limited Marketability. Securities with limited marketability, such as stock in the FHLB, are carried at cost and assessed for other-than-temporary impairment. Fair Value Option . We elect the fair value option for MBS purchased at a significant premium. Premises and Equipment . Land is carried at cost. Bank premises and equipment are stated at cost, net of accumulated depreciation. Depreciation is computed on a straight line basis over the estimated useful lives of the related assets. Useful lives are estimated to be 15 to 40 years for premises and 3 to 10 years for equipment. Leasehold improvements are generally depreciated over the lesser of the term of the respective leases or the estimated useful lives of the improvements. Maintenance and repairs are charged to expense as incurred while major improvements and replacements are capitalized. Bank-Owned Life Insurance . The Company has purchased life insurance policies on certain key executives. 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. Changes in the net cash surrender value of the policies, as well as insurance proceeds received are reflected in non-interest income on the consolidated statements of income and are not subject to income taxes. Goodwill and Other Intangibles . Other intangible assets consist primarily of core deposits. Intangible assets with definite useful lives are amortized on an accelerated basis over their estimated life. Goodwill and intangible assets that have indefinite useful lives are subject to at least an annual impairment test and more frequently if a triggering event occurs. If any such impairment is determined, a write-down is recorded. During the year ended December 31, 2015 , we changed our annual goodwill impairment testing date from December 31 st to October 1 st of each year, commencing on October 1, 2015. The change in the testing date did not impact the financial statements. During the year ended December 31, 2015 , the fair value of the reporting unit was greater than the carrying value of the reporting unit. As a result, we did not record any goodwill impairment for the year ended December 31, 2015 , and we had no cumulative goodwill impairment. For the years ended December 31, 2015 , 2014 and 2013 , amortization expense related to our core deposit intangible was $2.2 million , $187,000 , and $146,000 , respectively. Repurchase Agreements . We sell certain securities under agreements to repurchase. The agreements are treated as collateralized financing transactions and the obligations to repurchase securities sold are reflected as a liability in the accompanying consolidated balance sheets. The dollar amount of the securities underlying the agreements remains in the asset account. We determine the type of securities to pledge. Generally we pledge U.S. agency MBS. Revenue Recognition. The following summarizes our revenue recognition policies as they relate to certain noninterest income line items in the consolidated statements of income. Service charges on deposit accounts include fees for banking services provided, overdrafts and non-sufficient funds. Revenue is generally recognized in accordance with published deposit account agreements for retail accounts or contractual agreements for commercial accounts. Trust income includes fees and commissions from investment management, administrative and advisory services primarily for individuals, and to a lesser extent, partnerships and corporations. Revenue is recognized on an accrual basis at the time the services are performed and are based on either the market value of the assets managed or the services provided. Advertising Costs . Advertising costs are expensed as incurred. Advertising expense was $1.0 million for both years ended December 31, 2015 and 2014 , and $1.3 million for the year ended December 31, 2013 . Income Taxes . We file a consolidated federal income tax return. Income tax expense represents the taxes expected to be paid or returned for current year taxes adjusted for the change in deferred tax assets and liabilities. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of changes in tax rates is recognized in income in the period the change occurs. FHLB Advance Option Fees . Option fees paid to the FHLB giving us the option to enter into long-term advance commitments at specified interest rates in the future are capitalized and reviewed for impairment. Once the option is exercised, the FHLB advance option fee is amortized over the term of the advance as interest expense. Fair Value of Financial Instruments . Fair values of financial instruments are estimated using relevant market information and other assumptions. Fair value estimates involve uncertainties and matters of significant judgment. In cases where quoted market prices are not available, fair values are based on estimates using present value or other estimation techniques. Those techniques are significantly affected by the assumptions used, including the discount rate and estimates of future cash flows. Defined Benefit Pension Plan . Defined benefit pension plan costs are charged to retirement expense and included in “salaries and employee benefits” on the consolidated statements of income. Defined benefit pension obligations and the annual pension costs are determined by independent actuaries and through the use of a number of assumptions that are reviewed by management. These assumptions include a compensation rate increase, a discount rate used to determine the current benefit obligation and a long-term expected rate of return on plan assets. Net periodic defined benefit pension expense includes service cost, interest cost based on the assumed discount rate, an expected return on plan assets, amortization of prior service cost and amortization of net actuarial gains or losses. Prior service costs include the impact of plan amendments on the liabilities and are amortized over the future service periods of active employees expected to receive benefits under the plan. Actuarial gains and losses result from experience different from that assumed and from changes in assumptions. Amortization of actuarial gains and losses is included as a component of net periodic defined benefit pension cost. The plan obligations and related assets of our defined benefit pension plan are presented in “Note 11 – Employee Benefits” to our consolidated financial statements included in this report. Share-Based Awards . Share-based compensation transactions are recognized as compensation cost in the income statement based on their fair values on the date of the grant and recorded over the vesting period. 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. Trust Assets . Assets of our trust department, other than cash on deposit at Southside Bank, are not included in the accompanying financial statements because they are not our assets. Subsequent Events . On January 28, 2016 , the Board of Directors approved a Stock Repurchase Plan . The Board authorized the repurchase, from time to time, of up to 5% of the issued and outstanding common stock, or approximately 1.27 million shares, in open market purchases and privately negotiated transactions at prevailing market prices. The Company has no obligation to repurchase any shares under the Stock Repurchase Plan and may suspend or discontinue it at any time. Subsequent to December 31, 2015 and through March 2, 2016, we purchased 424,701 shares of common stock at an average price of $22.89 pursuant to the Stock Repurchase Plan. Accounting Pronouncements : In May 2014, the FASB issued ASU 2014-09, “Revenue from Contracts with Customers (Topic 606).” This update 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 update 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, FASB issued ASU 2015-14, “Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date,” which effectively delayed the adoption date by one year. We are required to adopt ASU 2014-09 in the first quarter of fiscal 2018 and early adoption is permitted. The guidance permits companies to either apply the requirements retrospectively to all prior periods presented, or apply the requirements in the year of adoption, through cumulative adjustment. We have not yet selected a transition method nor have we determined the impact of adoption on our consolidated financial statements. In April 2015, the FASB issued ASU 2015-05, “Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40) – Customer’s Accounting for Fees Paid in a Cloud Computing Arrangement.” ASU 2015-05 affects the accounting for fees paid by a customer in cloud computing arrangements such as (i) software as a service, (ii) platform as a service (iii) infrastructure as a service and (iv) other similar hosting arrangements. If a cloud computing arrangement includes a software license, then the customer should account for the software license element of the arrangement consistent with the acquisition of other software licenses. If a cloud computing arrangement does not include a software license, the customer should account for the arrangement as a service contract. ASU 2015-05 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. Early adoption is permitted. The adoption of this guidance is not expected to have a significant impact on our consolidated financial statements. In May 2015, the FASB issued ASU 2015-07, “Disclosures for Investments in Certain Entities that Calculate Net Asset Value per Share.” ASU 2015-07 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. ASU 2015-07 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. Early adoption is permitted. The adoption of this guidance is not expected to have a significant impact on our consolidated financial statements. In September 2015, the FASB issued ASU 2015-16, “Business Combinations (Topic 805) – Simplifying the Accounting for Measurement-Period Adjustments.” ASU 2015-16 eliminates the requirement for an acquirer in a business combination to account for measurement-period adjustments retrospectively. Instead, acquirers must recognize measurement-period adjustments during the period in which the amounts are determined, including the effect on earnings of any amounts that would have been recorded in previous periods if the accounting had been completed at the acquisition date. ASU 2015-16 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. Early adoption is permitted. We adopted this guidance early for the year ended December 31, 2015. See “Note 2 – Acquisition” for details regarding measurement-period adjustments and the effect on our consolidated financial statements. In January 2016, the FASB issued ASU 2016-1, “Financial Instruments – Overall (Subtopic 825-10) – Recognition and Measurement of Financial Assets and Financial Liabilities." ASU 2016-01, among other things, (i) requires equity investments, with certain exceptions, to be measured at fair value with changes in fair value recognized in net income, (ii) simplifies the impairment assessment of equity investments without readily determinable fair values by requiring a qualitative assessment to identify impairment, (iii) eliminates the requirement for public business entities to disclose the methods and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet, (iv) requires public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes, (v) requires an entity to present separately in other comprehensive income the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option for financial instruments, (vi) requires separate presentation of financial assets and financial liabilities by measurement category and form of financial asset on the balance sheet or the accompanying notes to the financial statements and (vii) clarifies that an entity should evaluate the need for a valuation allowance on a deferred tax asset related to available-for-sale securities in combination with the entity's other deferred tax assets. ASU 2016-01 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2017. Early adoption is permitted. The adoption of this guidance is not expected to have a significant impact on our consolidated financial statements.

ACQUISITION

ACQUISITION	12 Months Ended
	Dec. 31, 2015
Business Combinations [Abstract]
Acquisition	ACQUISITION On December 17, 2014 , we acquired 100% of the outstanding stock of OmniAmerican Bancorp, Inc. and its wholly-owned subsidiary OmniAmerican Bank (collectively, “Omni”) headquartered in Fort Worth, Texas. Omni operated 14 banking offices in Fort Worth, Texas and surrounding areas. We acquired Omni to further expand our presence in the growing Fort Worth market. The operations of Omni were merged into the Company as of the date of the acquisition. The results of Omni's operations for December 17 - December 31, 2014 are included in the consolidated financial statements and are not separately quantifiable subsequent to the business combination. Pursuant to the merger agreement and our closing stock price on December 17, 2014 of $29.39 , we issued 5.2 million shares of our common stock and paid $157.4 million in cash for all outstanding shares of OmniAmerican Bancorp stock and outstanding stock options. In accordance with the merger agreement, each outstanding share of common stock of OmniAmerican Bancorp, Inc. was converted into (a) 0.4459 of a share of common stock of the Company and (b) $13.125 in cash (the “Per Share Merger Consideration”). Each Omni restricted stock award and stock option, whether vested or unvested, that was outstanding immediately prior to the effective time of the merger, was cancelled and converted to the right to receive the Per Share Merger Consideration in the case of the restricted stock awards or, in the case of the stock options, the excess, if any, of the Per Share Merger Consideration over the exercise price of such stock option. The consideration associated with the non-vested restricted awards and the unvested stock options is excluded from the total purchase consideration. The total merger consideration for the Omni merger was $298.3 million . The fair value of assets acquired, excluding goodwill, totaled $1.36 billion , including total loans of $763.3 million and total investment securities of $428.4 million . Total fair value of the liabilities assumed totaled $1.13 billion , including deposits of $801.3 million . Goodwill represents consideration transferred in excess of the fair value of the net assets acquired. As of December 31, 2015 , the Company recognized $69.3 million in initial goodwill associated with the Omni merger. The goodwill resulting from the acquisition represents the value expected from the opportunities to strategically grow our franchise in the greater Fort Worth market area and to enhance our operations through customer synergies and efficiencies, thereby providing enhanced customer service. Goodwill is not expected to be deductible for tax purposes. The Omni merger was accounted for using the purchase method of accounting and accordingly, purchased assets, including identifiable intangible assets, and assumed liabilities were recorded at their respective acquisition date fair values. The components of the consideration paid are shown in the following table (in thousands). Fair value of consideration transferred: Common stock issued $ 151,891 Cash 157,408 Less: Post-combination share-based compensation expense (1) 8,874 Reimbursement of contract cancellation fees 1,815 Non-compete agreements 300 Total consideration transferred $ 298,310 (1) In connection with the merger, we recorded the unvested stock options and the non-vested restricted stock awards as a post-combination expense. The purchase price allocation as reported at December 31, 2014 was preliminary and was subject to final determination and valuation of the fair value of assets acquired and liabilities assumed. Within the measurement period which closed during the fourth quarter 2015, we made purchase accounting adjustments to goodwill, consisting primarily of a $1.4 million adjustment to the fair value of Visa Class B stock included in other investments on the consolidated balance sheets, not previously recorded, which upon the filing of the short-period Federal Income Tax return for Omni and its subsidiaries and other immaterial adjustments was partially offset by a $1.0 million decrease to taxes receivable included in other assets on the consolidated balance sheets. The estimated fair values of the assets acquired and liabilities assumed as of the closing date of the transaction adjusted for the subsequent measurement period adjustments are shown in the following table (in thousands). As Originally Reported (1) Measurement Period Adjustments Adjusted Balances Cash, cash equivalents, and amounts due from banks $ 21,214 $ — $ 21,214 Other investments 15,698 1,345 17,043 Securities available for sale 428,447 — 428,447 Loans held for sale 748 — 748 Loans 763,327 159 763,486 Property and equipment 58,928 — 58,928 Bank owned life insurance 44,964 — 44,964 Other assets 13,409 (970 ) 12,439 Core deposit intangible 8,570 — 8,570 Goodwill 69,338 148 69,486 Deposits (801,327 ) — (801,327 ) Short-term borrowings (7,000 ) — (7,000 ) Federal Home Loan Bank advances (308,516 ) — (308,516 ) Deferred tax liability, net (3,244 ) (682 ) (3,926 ) Other liabilities (6,246 ) — (6,246 ) $ 298,310 $ — $ 298,310 (1) The estimated fair value as of the acquisition date, December 17, 2014, as previously reported in our Form 10-K for the year ended December 31, 2014. The following table reflects the changes in the carrying amount of our goodwill for the year ended December 31, 2015 (in thousands): Goodwill Balance as of December 31, 2014 $ 91,372 Plus: measurement period adjustments 148 Balance as of December 31, 2015 $ 91,520 The determination of estimated fair values of the acquired loans required the Company to make certain estimates about discount rates, future expected cash flows, market conditions and other future events that are highly subjective in nature. Based on such factors as past due status, nonaccrual status, bankruptcy status, and credit risk ratings, the acquired loans were divided into loans with evidence of credit quality deterioration, which are accounted for under ASC 310-30 (purchased credit impaired “PCI”), and loans that do not meet this criteria, which are accounted for under ASC 310-20 (purchased non-impaired). Expected cash flows, both principal and interest, were estimated based on key assumptions covering such factors as prepayments, default rates and severity of loss given default. These assumptions were developed using both Omni’s historical experience and the portfolio characteristics as of the acquisition date as well as available market research. The fair value estimates for acquired loans were based on the amount and timing of expected principal, interest and other cash flows, including expected prepayments, discounted at prevailing market interest rates applicable to the types of acquired loans, which we considered to be level 3 fair value measurements. Deposit liabilities assumed in the acquisition of Omni were segregated into two categories: time-deposits (i.e., deposit accounts with a stated maturity) and demand deposits, both using level 2 fair value measurements. In determining fair value of time deposits, the Company discounted the contractual cash flows of the deposit accounts using prevailing market interest rates for time deposit accounts of similar type and duration. For demand deposits, the acquisition date outstanding balance of the assumed demand deposit accounts approximates fair value. The acquisition date fair value assigned to FHLB advance borrowings was determined based on prepayment penalty quotes for these assumed FHLB advances, which we considered to be level 2 fair value measurements. Acquisition date fair values for AFS securities were determined using Level 1 or Level 2 inputs consistent with the methods discussed further in “Note 12 - Fair Value Measurement”. The remaining acquisition date fair values represent either Level 2 fair value measurements (other investments, loans held for sale, and short term borrowings) or Level 3 fair value measurements (property and equipment and core deposit intangible). We recognized a core deposit intangible of $8.6 million which will be amortized using an accelerated method over a 10 year period consistent with expected future cash flows. For the year ended December 31, 2014, the Company incurred a total of pre-tax merger related expenses associated with the Omni merger of approximately $15.9 million which consisted of $4.4 million of legal and consulting fees and $2.6 million of software expenses due to canceling of contracts. These expenses were recognized in the consolidated statements of income in professional fees and software and data processing expense, respectively. In addition, approximately $8.9 million was immediately recognized as share-based compensation at closing as a result of the vesting provisions of the underlying awards. The share-based compensation expense is a component of salaries and employee benefits in the consolidated statements of income. We incurred cost of $599,000 directly related to the issuance of the shares related to the merger which were offset against additional paid-in-capital in the consolidated statements of changes in equity. We also recorded non-compete agreements for $300,000 that will be amortized using the straight-line method over three years in conjunction with the merger. Loans acquired with Omni were measured at fair value at the acquisition date with no carryover of any allowance for loan losses. Loans were segregated into those loans considered to be performing and those considered purchased credit impaired (“PCI”). PCI loans are loans acquired with evidence of deteriorated credit quality for which it was probable, at acquisition, that all contractually required cash flows would not be collected. The table below details the PCI loan portfolio at acquisition date (in thousands): Purchased Credit Impaired Loans at Acquisition Date Contractually required principal and interest payments $ 46,647 Nonaccretable difference 23,262 Cash flows expected to be collected 23,385 Accretable difference 1,898 Fair value of loans acquired with a deterioration of credit quality $ 21,487 Acquired loans that were considered performing at acquisition date and therefore not subject to ASC 310-30 are shown below (in thousands): Fair Value at Acquisition Date Contractual Amounts Receivable Cash Flows Not Expected to be Collected at Acquisition Date (1) Real Estate Loans: Construction $ 49,625 $ 56,877 $ 3,947 1-4 Family Residential 282,577 608,986 248,669 Commercial 152,087 190,920 15,692 Commercial Loans 59,007 72,583 8,602 Loans to Individuals 199,292 261,280 34,689 Total Loans $ 742,588 $ 1,190,646 $ 311,599 (1) Cash flows not expected to be collected relate to estimated credit losses and expected prepayments. Unaudited pro forma net income for the years ended December 31, 2014 and 2013 would have been $33.3 million and $38.8 million , respectively, and revenues would have been $209.0 million and $221.6 million for the same years, respectively, had the acquisition occurred as of January 1, 2013.

EARNINGS PER SHARE

EARNINGS PER SHARE	12 Months Ended
	Dec. 31, 2015
Earnings Per Share [Abstract]
EARNINGS PER SHARE	EARNINGS PER SHARE Earnings per share on a basic and diluted basis has been adjusted to give retroactive recognition to stock dividends and is calculated as follows (in thousands, except per share amounts): Years Ended December 31, 2015 2014 2013 Basic and Diluted Earnings: Net Income $ 43,997 $ 20,833 $ 41,190 Basic weighted-average shares outstanding: 25,350 20,028 19,709 Add: Stock options 85 99 42 Diluted weighted-average shares outstanding 25,435 20,127 19,751 Basic Earnings Per Share: Net Income $ 1.74 $ 1.04 $ 2.09 Diluted Earnings Per Share: Net Income $ 1.73 $ 1.04 $ 2.09 For the year ended December 31, 2015 , there were approximately 33,000 antidilutive options. For the years ended December 31, 2014 and 2013 there were approximately 10,000 and 4,000 antidilutive options, respectfully.

ACCUMULATED OTHER COMPREHENSIVE

ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME	12 Months Ended
	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)	ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME The changes in accumulated other comprehensive (loss) income by component are as follows (in thousands): Year Ended December 31, 2015 Unrealized Gains (Losses) on Securities Pension Plans Other OTTI Net Prior Net Gain (Loss) Total Beginning balance, net of tax $ 6,238 $ — $ 7 $ (21,815 ) $ (15,570 ) Other comprehensive (loss) income: Other comprehensive (loss) income before reclassifications (6,305 ) — (62 ) 2,806 (3,561 ) Reclassified from accumulated other comprehensive income (3,660 ) — (16 ) 2,448 (1,228 ) Income tax benefit (expense) 3,488 — 27 (1,839 ) 1,676 Net current-period other comprehensive (loss) income, net of tax (6,477 ) — (51 ) 3,415 (3,113 ) Ending balance, net of tax $ (239 ) $ — $ (44 ) $ (18,400 ) $ (18,683 ) Year Ended December 31, 2014 Unrealized Gains (Losses) on Securities Pension Plans Other OTTI Net Prior Net Gain (Loss) Total Beginning balance, net of tax $ (8,656 ) $ — $ (12 ) $ (12,369 ) $ (21,037 ) Other comprehensive income (loss): Other comprehensive income (loss) before reclassifications 25,743 — 43 (15,574 ) 10,212 Reclassified from accumulated other comprehensive income (2,830 ) — (14 ) 1,042 (1,802 ) Income tax (expense) benefit (8,019 ) — (10 ) 5,086 (2,943 ) Net current-period other comprehensive income (loss), net of tax 14,894 — 19 (9,446 ) 5,467 Ending balance, net of tax $ 6,238 $ — $ 7 $ (21,815 ) $ (15,570 ) Year Ended December 31, 2013 Unrealized Gains (Losses) on Securities Pension Plans Other OTTI Net Prior Net Gain (Loss) Total Beginning balance, net of tax $ 30,500 $ (1,140 ) $ 248 $ (26,670 ) $ 2,938 Other comprehensive (loss) income: Other comprehensive (loss) income before reclassifications (50,810 ) 753 (357 ) 19,215 (31,199 ) Reclassified from accumulated other comprehensive income (9,431 ) 1,001 (43 ) 2,787 (5,686 ) Income tax benefit (expense) 21,085 (614 ) 140 (7,701 ) 12,910 Net current-period other comprehensive (loss) income, net of tax (39,156 ) 1,140 (260 ) 14,301 (23,975 ) Ending balance, net of tax $ (8,656 ) $ — $ (12 ) $ (12,369 ) $ (21,037 ) The reclassifications out of accumulated other comprehensive (loss) income into net income are presented below (in thousands): Year ended December 31, 2015 2014 2013 Unrealized gains and losses on available for sale securities: Realized gain on sale of securities (1) $ 3,660 $ 2,830 $ 8,472 Impairment losses (2) — — (42 ) Total before tax 3,660 2,830 8,430 Tax expense (1,281 ) (991 ) (2,951 ) Net of tax $ 2,379 $ 1,839 $ 5,479 Amortization of pension plan: Net loss (3) $ (2,448 ) $ (1,042 ) $ (2,787 ) Prior service credit (3) 16 14 43 Total before tax (2,432 ) (1,028 ) (2,744 ) Tax benefit 851 359 960 Net of tax $ (1,581 ) $ (669 ) $ (1,784 ) Total reclassifications for the period, net of tax $ 798 $ 1,170 $ 3,695 (1) Listed as net gain on sale of securities available for sale on the consolidated statements of income. (2) Included in other in noninterest income on the consolidated statements of income. (3) These accumulated other comprehensive income components are included in the computation of net periodic pension cost presented in “Note 11 - Employee Benefits.”

SECURITIES

SECURITIES	12 Months Ended
	Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]
SECURITIES	SECURITIES The amortized cost, gross unrealized gains and losses, carrying value, and estimated fair value of investment and mortgage-backed securities as of December 31, 2015 and 2014 , are reflected in the tables below (in thousands): December 31, 2015 Recognized in OCI Not recognized in OCI Amortized Gross Unrealized Gross Unrealized Carrying Gross Gross Unrealized Estimated AVAILABLE FOR SALE Cost Gains Losses Value Gains Losses Fair Value Investment Securities: U.S. Treasury $ 103,906 $ 61 $ 380 $ 103,587 $ — $ — $ 103,587 State and Political Subdivisions 236,534 8,323 611 244,246 — — 244,246 Other Stocks and Bonds 12,772 63 45 12,790 — — 12,790 Other Equity Securities 6,052 — 36 6,016 — — 6,016 Mortgage-backed Securities: (1) Residential 580,621 9,120 1,239 588,502 — — 588,502 Commercial 512,116 466 7,231 505,351 — — 505,351 Total $ 1,452,001 $ 18,033 $ 9,542 $ 1,460,492 $ — $ — $ 1,460,492 HELD TO MATURITY Investment Securities: State and Political Subdivisions $ 389,997 $ 4,772 $ 9,273 $ 385,496 $ 13,061 $ 1,363 $ 397,194 Mortgage-backed Securities: (1) Residential 31,430 — 51 31,379 2,018 1 33,396 Commercial 371,727 1,233 5,539 367,421 4,232 2,480 369,173 Total $ 793,154 $ 6,005 $ 14,863 $ 784,296 $ 19,311 $ 3,844 $ 799,763 December 31, 2014 Recognized in OCI Not recognized in OCI Amortized Gross Unrealized Gross Unrealized Carrying Gross Gross Unrealized Estimated AVAILABLE FOR SALE Cost Gains Losses Value Gains Losses Fair Value Investment Securities: U.S. Treasury $ 14,883 $ 30 $ 7 $ 14,906 $ — $ — $ 14,906 U.S. Government Agency Debentures 4,835 — 7 4,828 — — 4,828 State and Political Subdivisions 260,535 8,055 906 267,684 — — 267,684 Other Stocks and Bonds 13,086 153 — 13,239 — — 13,239 Other Equity Securities 6,061 — 12 6,049 — — 6,049 Mortgage-backed Securities: (1) Residential 952,481 12,624 807 964,298 — — 964,298 Commercial 176,112 1,743 151 177,704 — — 177,704 Total $ 1,427,993 $ 22,605 $ 1,890 $ 1,448,708 $ — $ — $ 1,448,708 HELD TO MATURITY Investment Securities: State and Political Subdivisions $ 393,525 $ 5,168 $ 9,870 $ 388,823 $ 12,181 $ 756 $ 400,248 Mortgage-backed Securities: (1) Residential 52,287 — 70 52,217 2,871 — 55,088 Commercial 207,624 — 6,345 201,279 5,461 489 206,251 Total $ 653,436 $ 5,168 $ 16,285 $ 642,319 $ 20,513 $ 1,245 $ 661,587 (1) All mortgage-backed securities issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises. During the second quarter of 2015, the Company transferred commercial mortgage-backed securities with a fair value of $57.7 million from AFS to HTM. The unrealized gain on the securities transferred from AFS to HTM was $1.3 million ( $864,000 , net of tax) at the date of transfer based on the fair value of the securities on the transfer date. We transferred these securities due to overall balance sheet strategies and our management has the current intent and ability to hold these securities until maturity. The overall net unrealized loss on the transferred securities included in accumulated other comprehensive income will be amortized over the remaining life of the underlying security as an adjustment of the yield on those securities. There were no securities transferred from AFS to HTM during 2014. The following table represents the unrealized loss on securities for the years ended December 31, 2015 and 2014 (in thousands): Less Than 12 Months More Than 12 Months Total Fair Value Unrealized Loss Fair Value Unrealized Loss Fair Value Unrealized Loss As of December 31, 2015: AVAILABLE FOR SALE Investment Securities: U.S. Treasury $ 64,172 $ 380 $ — $ — $ 64,172 $ 380 State and Political Subdivisions 15,550 116 19,270 495 34,820 611 Other Stocks and Bonds 2,954 45 — — 2,954 45 Other Equity Securities 6,016 36 — — 6,016 36 Mortgage-backed Securities: Residential 229,514 1,215 3,817 24 233,331 1,239 Commercial 422,316 7,039 5,110 192 427,426 7,231 Total $ 740,522 $ 8,831 $ 28,197 $ 711 $ 768,719 $ 9,542 HELD TO MATURITY Investment Securities: State and Political Subdivisions $ 24,340 $ 214 $ 62,240 $ 1,149 $ 86,580 $ 1,363 Mortgage-backed Securities: Residential 1,717 1 — — 1,717 1 Commercial 193,710 2,439 2,481 41 196,191 2,480 Total $ 219,767 $ 2,654 $ 64,721 $ 1,190 $ 284,488 $ 3,844 As of December 31, 2014: AVAILABLE FOR SALE Investment Securities: U.S. Treasury $ 4,968 $ 7 $ — $ — $ 4,968 $ 7 U.S. Government Agency Debentures 4,828 7 — — 4,828 7 State and Political Subdivisions 28,155 90 44,269 816 72,424 906 Other Equity Securities 6,049 12 — — 6,049 12 Mortgage-backed Securities: Residential 347,777 573 27,632 234 375,409 807 Commercial 21,103 54 10,116 97 31,219 151 Total $ 412,880 $ 743 $ 82,017 $ 1,147 $ 494,897 $ 1,890 HELD TO MATURITY Investment Securities: State and Political Subdivisions $ 7,843 $ 31 $ 64,946 $ 725 $ 72,789 $ 756 Mortgage-backed Securities: Commercial — — 44,144 489 44,144 489 Total $ 7,843 $ 31 $ 109,090 $ 1,214 $ 116,933 $ 1,245 We review those securities in an unrealized loss position for significant differences between fair value and the cost basis to evaluate if a classification of other-than-temporary impairment is warranted. In estimating other-than-temporary impairment losses, management considers, among other things, the length of time and the extent to which the fair value has been less than cost and the financial condition and near-term prospects of the issuer. The Company considers an other-than-temporary impairment to have occurred when there is an adverse change in expected cash flows. When it is determined that a decline in fair value of HTM or AFS securities is other-than-temporary, the carrying value of the security is reduced to its estimated fair value, with a corresponding charge to earnings for the credit portion and the noncredit portion to other comprehensive income. Based upon the length of time and the extent to which fair value is less than cost, we believe that none of the securities with an unrealized loss have other-than-temporary impairment at December 31, 2015 . For those securities in an unrealized loss position, we do not currently intend to sell the securities and it is not more likely than not that we will be required to sell the securities before the anticipated recovery of their amortized cost basis. To the best of management’s knowledge and based on our consideration of the qualitative factors associated with each security, there were no securities in our investment and MBS portfolio with an other-than-temporary impairment at December 31, 2015 . On December 13, 2013, management decided to sell AFS Other Stocks and Bonds, with a $2.7 million amortized cost basis in pooled trust preferred securities (“TRUPs”) as a result of new guidance effective in 2014 as listed in Section 419 of the Dodd-Frank Act (Volcker Rule). Those securities were structured products with cash flows dependent upon securities issued by U.S. financial institutions, including banks and insurance companies. The sale of these securities resulted in a loss of approximately $959,000 in 2013. Until the final rules of the Volcker Rule were issued by the agencies on December 10, 2013, management did not intend to sell the securities and it was not more likely than not that we would be required to sell the security before the anticipated recovery of its amortized cost basis. The following table presents a roll forward of the credit losses recognized in earnings on these AFS debt securities held at the end of the year presented (in thousands): Year Ended December 31, 2013 Balance, beginning of period $ 3,256 Additions for credit losses recognized on debt securities that had previously incurred impairment losses 42 Sales of credit impaired securities (3,298 ) Balance, end of period $ — There were no credit losses recognized in earnings on AFS debt securities held at December 31, 2015 or 2014. Interest income recognized on securities for the years presented (in thousands): Years Ended December 31, 2015 2014 2013 U.S. Treasury $ 1,132 $ 264 $ 17 U.S. Government Agency Debentures 118 104 440 State and Political Subdivisions 22,474 24,077 25,620 Other Stocks and Bonds 213 208 205 Other Equity Securities 118 — — Mortgage-backed Securities 33,661 28,207 20,085 Total interest income on securities $ 57,716 $ 52,860 $ 46,367 Of the $3.7 million in net securities gains from the AFS portfolio for the year ended December 31, 2015, there were $4.9 million in realized gains and approximately $1.2 million in realized losses. Of the $2.8 million in net securities gains from the AFS portfolio for the year ended December 31, 2014 , there were $8.2 million in realized gains and approximately $5.4 million in realized losses. Of the $8.5 million in net securities gains from the AFS portfolio for the year ended December 31, 2013 , there were $14.9 million in realized gains and $6.4 million in realized losses. There were no sales from the HTM portfolio during the years ended December 31, 2015 , 2014 or 2013 . The amortized cost, carrying value, and fair value of securities at December 31, 2015 , are presented below by contractual maturity. Expected maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations. MBS are presented in total by category due to the fact that MBS typically are issued with stated principal amounts, and the securities are backed by pools of mortgages that have loans with varying maturities. The characteristics of the underlying pool of mortgages, such as fixed-rate or adjustable-rate, as well as prepayment risk, are passed on to the certificate holder. The term of a mortgage-backed pass-through security thus approximates the term of the underlying mortgages and can vary significantly due to prepayments. December 31, 2015 Amortized Cost Fair Value Available for sale securities: (in thousands) Investment Securities Due in one year or less $ 21,207 $ 21,313 Due after one year through five years 13,438 13,773 Due after five years through ten years 133,958 134,507 Due after ten years 184,609 191,030 353,212 360,623 Mortgage-backed securities and other equity securities 1,098,789 1,099,869 Total $ 1,452,001 $ 1,460,492 December 31, 2015 Carrying Value Fair Value Held to maturity securities: (in thousands) Investment Securities Due in one year or less $ 2,437 $ 2,434 Due after one year through five years 16,196 16,322 Due after five years through ten years 57,508 58,719 Due after ten years 309,355 319,719 385,496 397,194 Mortgage-backed securities 398,800 402,569 Total $ 784,296 $ 799,763 Investment and MBS with book values of $1.33 billion and $1.12 billion were pledged as of December 31, 2015 and 2014 , respectively, to collateralize FHLB advances, repurchase agreements and public funds or for other purposes as required by law. Securities with limited marketability, such as FHLB stock and other investments, are carried at cost, which approximates fair value and are assessed for other-than-temporary impairment. These securities have no maturity date.

LOANS AND ALLOWANCE FOR PROBABL

LOANS AND ALLOWANCE FOR PROBABLE LOAN LOSSES	12 Months Ended
	Dec. 31, 2015
Receivables [Abstract]
LOANS AND ALLOWANCE FOR PROBABLE LOAN LOSSES	LOANS AND ALLOWANCE FOR PROBABLE LOAN LOSSES Loans in the accompanying consolidated balance sheets are classified as follows (in thousands): December 31, 2015 December 31, 2014 Real Estate Loans: Construction $ 438,247 $ 267,830 1-4 Family Residential 655,410 690,895 Commercial 635,210 468,171 Commercial Loans 242,527 226,460 Municipal Loans 288,115 257,492 Loans to Individuals 172,244 270,285 Total Loans (1) 2,431,753 2,181,133 Less: Allowance for Loan Losses 19,736 13,292 Net Loans $ 2,412,017 $ 2,167,841 (1) Includes approximately $581.1 million and $763.3 million as of December 31, 2015 and 2014 , respectively, of loans acquired with the Omni acquisition on December 17, 2014. These loans were measured at fair value at the acquisition date with no carryover of allowance for loan loss. The allowance for loan loss recorded on acquired loans for the year ended December 31, 2015 totaled $629,000 . Loans to Affiliated Parties In the normal course of business, we make loans to certain of our own executive officers and directors and their related interests. As of December 31, 2015 , 2014 and 2013 , these loans totaled $8.1 million , $7.1 million and $5.5 million , respectively. These loans represented 1.8% , 1.7% , and 2.1% of shareholders' equity as of December 31, 2015 , 2014 and 2013 , respectively. Real Estate Construction Loans Our construction loans are collateralized by property located primarily in the market areas we serve. A majority of our construction loans will be owner-occupied upon completion. Construction loans for speculative projects are financed, but these typically have secondary sources of repayment and collateral. Our construction loans have both adjustable and fixed interest rates during the construction period. Construction loans to individuals are typically priced and made with the intention of granting the permanent loan on the property. Speculative and commercial construction loans are subject to underwriting standards similar to that of the commercial portfolio. Owner occupied 1-4 family residential construction loans are subject to the underwriting standards of the permanent loan. Real Estate 1-4 Family Residential Loans Residential loan originations are generated by our loan officers, in-house origination staff, marketing efforts, present customers, walk-in customers and referrals from real estate agents and builders. We focus our residential lending efforts primarily on the origination of loans secured by first mortgages on owner-occupied, 1-4 family residences. Substantially all of our 1-4 family residential loan originations are secured by properties located in or near our market areas. Our 1-4 family residential loans generally have maturities ranging from five to 30 years. These loans are typically fully amortizing with monthly payments sufficient to repay the total amount of the loan. Our 1-4 family residential loans are made at both fixed and adjustable interest rates. Underwriting for 1-4 family residential loans includes debt-to-income analysis, credit history analysis, appraised value and down payment considerations. Changes in the market value of real estate can affect the potential losses in the portfolio. Commercial Real Estate Loans Commercial real estate consists of $583.4 million of commercial real estate loans, $46.8 million of loans secured by multi-family properties and $5.0 million of loans secured by farm land. Commercial real estate loans primarily include loans collateralized by commercial office buildings, retail, medical facilities and offices, warehouse facilities, hotels and churches. In determining whether to originate commercial real estate loans, we generally consider such factors as the financial condition of the borrower and the debt service coverage of the property. Commercial real estate loans are made at both fixed and adjustable interest rates for terms generally up to 20 years. Commercial Loans Our commercial loans are diversified loan types including short-term working capital loans for inventory and accounts receivable and short- and medium-term loans for equipment or other business capital expansion. Management does not consider there to be a concentration of risk in any one industry type, other than the medical industry. Loans to borrowers in the medical industry include all loan types listed above for commercial loans. Collateral for these loans varies depending on the type of loan and financial strength of the borrower. The primary source of repayment for loans in the medical community is cash flow from continuing operations. In our commercial loan underwriting, we assess the creditworthiness, ability to repay, and the value and liquidity of the collateral being offered. Terms of commercial loans are generally commensurate with the useful life of the collateral offered. Municipal Loans We have a specific lending department that makes loans to municipalities and school districts primarily throughout the state of Texas. Municipal loans outside the state of Texas have been limited to adjoining states. The majority of the loans to municipalities and school districts have tax or revenue pledges and in some cases are additionally supported by collateral. Municipal loans made without a direct pledge of taxes or revenues are usually made based on some type of collateral that represents an essential service. Loans to Individuals Substantially all originations of our loans to individuals are made to consumers in our market areas. The majority of loans to individuals are collateralized by titled equipment, which are primarily automobiles. Loan terms vary according to the type and value of collateral, length of contract and creditworthiness of the borrower. The underwriting standards we employ for consumer loans include an application, a determination of the applicant's payment history on other debts, with the greatest weight being given to payment history with us, and an assessment of the borrower's ability to meet existing obligations and payments on the proposed loan. Although creditworthiness of the applicant is a primary consideration, the underwriting process also includes a comparison of the value of the collateral, if any, in relation to the proposed loan amount. Most of our loans to individuals are collateralized, which management believes should assist in limiting our exposure. During the fourth quarter of 2014, we closed on the sale of all of our subprime automobile loans purchased through SFG, as well as the repossessed assets held by SFG. As a result, the carrying amount of SFG loans totaling $70.3 million were sold and were therefore not included in our loan portfolio as of December 31, 2014 . There were no subsequent loan pool purchases through SFG from December 2014 until the time it was dissolved in April 2015. Allowance for Loan Losses The allowance for loan losses is based on the most current review of the loan portfolio and is a result of multiple processes. First, the bank utilizes historical data to establish general reserve amounts for each class of loans. The historical charge off figure is further adjusted through qualitative factors that include general trends in past dues, nonaccruals and classified loans to more effectively and promptly react to both positive and negative movements. Second, our lenders have the primary responsibility for identifying problem loans based on customer financial stress and underlying collateral. These recommendations are reviewed by senior loan administration, the special assets department, and the loan review department. Third, the loan review department independently reviews the portfolio on an annual basis. The loan review department follows a board-approved annual loan review scope. The loan review scope encompasses a number of considerations including the size of the loan, the type of credit extended, the seasoning of the loan and the performance of the loan. The loan review scope, as it relates to size, focuses more on larger dollar loan relationships, typically, for example, aggregate debt of $500,000 or greater. The loan review officer also reviews specific reserves compared to general reserves to determine trends in comparative reserves as well as losses not reserved for prior to charge-off to determine the effectiveness of the specific reserve process. At each review, a subjective analysis methodology is used to grade the respective loan. Categories of grading vary in severity from loans that do not appear to have a significant probability of loss at the time of review to loans that indicate a probability that the entire balance of the loan will be uncollectible. If full collection of the loan balance appears unlikely at the time of review, estimates of future expected cash flows or appraisals of the collateral securing the debt are used to determine the necessary allowances. The internal loan review department maintains a list of all loans or loan relationships that are graded as having more than the normal degree of risk associated with them. In addition, a list of specifically reserved loans or loan relationships of $150,000 or more is updated on a quarterly basis in order to properly determine necessary allowances and keep management informed on the status of attempts to correct the deficiencies noted with respect to the loan. We calculate historical loss ratios for pools of similar loans with similar characteristics based on the proportion of actual charge-offs experienced to the total population of loans in the pool. The historical gross loss ratios are updated based on actual charge-off experience quarterly and adjusted for qualitative factors. Our pools of similar loans include consumer loans and loans secured by 1-4 residential family loans. Prior to September 30, 2014, SFG loans included in loans to individuals that experienced past due status or extension of maturity characteristics were reserved for at higher levels based on the circumstances associated with each specific loan. In general, the reserves for SFG were calculated based on the past due status of the loan. For reserve purposes, the portfolio was segregated by past due status and by the remaining term variance from the original contract. During repayment, loans that paid late took longer to repay than the original contract. Additionally, some loans may have been granted extensions for extenuating payment circumstances and evaluated for troubled debt classification. The remaining term extensions increased the risk of collateral deterioration and, accordingly, reserves were increased to recognize this risk. Industry and our own experience indicates that a portion of our loans will become delinquent and a portion of the loans will require partial or full charge-off. Regardless of the underwriting criteria utilized, losses may be experienced as a result of various factors beyond our control, including, among other things, changes in market conditions affecting the value of properties used as collateral for loans and problems affecting the credit of the borrower and the ability of the borrower to make payments on the loan. Our determination of the appropriateness of the allowance for loan losses is based on various considerations, including an analysis of the risk characteristics of various classifications of loans, previous loan loss experience, specific loans which would have loan loss potential, delinquency trends, estimated fair value of the underlying collateral, current economic conditions, and geographic and industry loan concentration. Credit Quality Indicators We categorize loans into risk categories on an ongoing basis based on relevant information about the ability of borrowers to service their debt such as: current financial information, historical payment experience, credit documentation, public information, and current economic trends, among other factors. We use the following definitions for risk ratings: • Pass (Rating 1 – 4) – This rating is assigned to all satisfactory loans. This category, by definition, consists of acceptable credit. Credit and collateral exceptions should not be present, although their presence would not necessarily prohibit a loan from being rated Pass, if deficiencies are in process of correction. These loans are not included in the Watch List. • Pass Watch (Rating 5) – These loans require some degree of special treatment, but not due to credit quality. This category does not include loans specially mentioned or adversely classified; however, particular attention must be accorded such credits due to characteristics such as: ◦ A lack of, or abnormally extended payment program; ◦ A heavy degree of concentration of collateral without sufficient margin; ◦ A vulnerability to competition through lesser or extensive financial leverage; and ◦ A dependence on a single or few customers or sources of supply and materials without suitable substitutes or alternatives. • Special Mention (Rating 6) – A Special Mention asset has potential weaknesses that deserve management’s close attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects for the asset or in the institution’s credit position at some future date. Special Mention assets are not adversely classified and do not expose an institution to sufficient risk to warrant adverse classification. • Substandard (Rating 7) – Substandard loans are inadequately protected by the current sound worth and paying capacity of the obligor or of the collateral pledged, if any. Loans so classified must have a well-defined weakness or weaknesses that jeopardize the liquidation of the debt. They are characterized by the distinct possibility that the Bank will sustain some loss if the deficiencies are not corrected. • Doubtful (Rating 8) – Loans classified as Doubtful have all the weaknesses inherent in those classified Substandard with the added characteristic that the weaknesses make collection or liquidation, in full, on the basis of currently known facts, conditions and values, highly questionable and improbable. All accruing loans are reserved for as a group of similar type credits and included in the general portion of the allowance for loan losses. Loans to individuals and 1-4 family residential loans, including loans not accruing, are collectively evaluated and included in the general portion of the allowance for loan losses. All loans considered troubled debt restructurings (“TDR”) are evaluated individually for further impairment. The general portion of the loan loss allowance is reflective of historical charge-off levels for similar loans adjusted for changes in current conditions and other relevant factors. These factors are likely to cause estimated losses to differ from historical loss experience and include: • Changes in lending policies or procedures, including underwriting, collection, charge-off, and recovery procedures; • Changes in local, regional and national economic and business conditions, including entry into new markets; • Changes in the volume or type of credit extended; • Changes in the experience, ability, and depth of lending management; • Changes in the volume and severity of past due, nonaccrual, restructured, or classified loans; • Changes in charge-off trends; • Changes in loan review or Board oversight; • Changes in the level of concentrations of credit; and • Changes in external factors, such as competition and legal and regulatory requirements. These factors are also considered for the Omni purchased portfolio specifically in regards to changes in past due, nonaccrual and charge-off trends. The following tables detail activity in the allowance for loan losses by portfolio segment for the periods presented (in thousands): Year Ended December 31, 2015 Real Estate Construction 1-4 Family Residential Commercial Commercial Loans Municipal Loans Loans to Individuals Total Balance at beginning of period (2) $ 2,456 $ 2,822 $ 3,025 $ 3,279 $ 716 $ 994 $ 13,292 Provision (reversal) for loan losses 1,711 (284 ) 1,467 3,500 258 1,691 8,343 Loans charged off (24 ) (58 ) — (336 ) (249 ) (3,688 ) (4,355 ) Recoveries of loans charged off 207 115 85 153 — 1,896 2,456 Balance at end of period $ 4,350 $ 2,595 $ 4,577 $ 6,596 $ 725 $ 893 $ 19,736 Year Ended December 31, 2014 Real Estate Construction 1-4 Family Residential Commercial Commercial Loans Municipal Loans Loans to Individuals (1) Total Balance at beginning of period $ 2,142 $ 3,277 $ 2,572 $ 1,970 $ 668 $ 8,248 $ 18,877 Provision (reversal) for loan losses 172 (514 ) 445 1,204 48 13,583 14,938 Loans charged off (14 ) (22 ) — (66 ) — (22,461 ) (22,563 ) Recoveries of loans charged off 156 81 8 171 — 1,624 2,040 Balance at end of period (2) $ 2,456 $ 2,822 $ 3,025 $ 3,279 $ 716 $ 994 $ 13,292 (1) Of the $22.5 million in charge-offs recorded in the Loans to Individuals category for the year ended December 31, 2014 , approximately $7.1 million relate to the write-down of SFG loans to fair value in connection with the sale of the subprime automobile loans that was completed in the fourth quarter 2014. (2) Loans acquired with the Omni acquisition were measured at fair value on December 17, 2014 with no carryover of allowance for loan loss. Year Ended December 31, 2013 Real Estate Construction 1-4 Family Residential Commercial Commercial Loans Municipal Loans Loans to Individuals Other Total Balance at beginning of period $ 2,355 $ 3,545 $ 2,290 $ 3,158 $ 633 $ 7,373 $ 1,231 $ 20,585 Provision (reversal) for loan losses (290 ) (40 ) 10 (909 ) 35 10,073 — 8,879 Distribution of other allowance — — — — — 1,231 (1,231 ) — Loans charged off — (319 ) (67 ) (512 ) — (12,676 ) — (13,574 ) Recoveries of loans charged off 77 91 339 233 — 2,247 — 2,987 Balance at end of period $ 2,142 $ 3,277 $ 2,572 $ 1,970 $ 668 $ 8,248 $ — $ 18,877 The following tables present the balance in the allowance for loan losses by portfolio segment based on impairment method (in thousands): As of December 31, 2015 Real Estate Construction 1-4 Family Residential Commercial Commercial Loans Municipal Loans Loans to Individuals Total Ending balance – individually evaluated for impairment (1) $ 12 $ 25 $ 137 $ 4,599 $ 13 $ 105 $ 4,891 Ending balance – collectively evaluated for impairment 4,338 2,570 4,440 1,997 712 788 14,845 Balance at end of period $ 4,350 $ 2,595 $ 4,577 $ 6,596 $ 725 $ 893 $ 19,736 As of December 31, 2014 Real Estate Construction 1-4 Family Residential Commercial Commercial Loans Municipal Loans Loans to Individuals Total Ending balance – individually evaluated for impairment (1) $ 43 $ 102 $ 26 $ 242 $ 14 $ 103 $ 530 Ending balance – collectively evaluated for impairment 2,413 2,720 2,999 3,037 702 891 12,762 Balance at end of period $ 2,456 $ 2,822 $ 3,025 $ 3,279 $ 716 $ 994 $ 13,292 (1) Purchase credit impaired (“PCI”) loans were measured at fair value at acquisition and did not have any associated allowance for loan losses as of December 31, 2014 . As of December 31, 2015 , there was approximately $629,000 of allowance for loan losses associated with PCI loans. The following tables present the recorded investment in loans by portfolio segment based on impairment method (in thousands): December 31, 2015 Real Estate Construction 1-4 Family Residential Commercial Commercial Loans Municipal Loans Individuals Total Loans individually evaluated for impairment $ 508 $ 1,751 $ 3,757 $ 14,250 $ 637 $ 258 $ 21,161 Loans collectively evaluated for impairment 437,518 646,590 628,405 220,199 287,478 171,782 2,391,972 Purchased credit impaired loans 221 7,069 3,048 8,078 — 204 18,620 Total ending loans balance $ 438,247 $ 655,410 $ 635,210 $ 242,527 $ 288,115 $ 172,244 $ 2,431,753 December 31, 2014 Real Estate Construction 1-4 Family Residential Commercial Commercial Loans Municipal Loans Loans to Individuals Total Loans individually evaluated for impairment $ 2,461 $ 2,936 $ 1,605 $ 1,011 $ 699 $ 310 $ 9,022 Loans collectively evaluated for impairment (1) 264,584 680,658 463,564 216,272 256,793 268,894 2,150,765 Purchased credit impaired loans (2) 785 7,301 3,002 9,177 — 1,081 21,346 Total ending loans balance $ 267,830 $ 690,895 $ 468,171 $ 226,460 $ 257,492 $ 270,285 $ 2,181,133 (1) Includes purchased non impaired loans which were measured at fair value at acquisition and did not have an associated allowance for loan loss as of December 31, 2014 . (2) PCI loans were measured at fair value at acquisition and did not have an associated allowance for loan loss as of December 31, 2014 . The following tables set forth loans by credit quality indicator for the periods presented (in thousands): December 31, 2015 Pass Pass Watch Special Mention (1) Substandard (1) Doubtful (1) Total Real Estate Loans: Construction $ 434,893 $ — $ 1,754 $ 1,576 $ 24 $ 438,247 1-4 Family Residential 643,498 1,403 1,636 4,915 3,958 655,410 Commercial 620,117 — — 14,988 105 635,210 Commercial Loans 204,775 716 1,738 27,681 7,617 242,527 Municipal Loans 286,415 — 1,063 637 — 288,115 Loans to Individuals 170,558 2 — 478 1,206 172,244 Total $ 2,360,256 $ 2,121 $ 6,191 $ 50,275 $ 12,910 $ 2,431,753 (1) Includes PCI loans comprised of $95,000 special mention, $3.6 million substandard, and $9.9 million doubtful as of December 31, 2015 . December 31, 2014 Pass Pass Watch Special Mention (1) Substandard (1) Doubtful Total Real Estate Loans: Construction $ 260,183 $ 862 $ 1,394 $ 5,363 $ 28 $ 267,830 1-4 Family Residential 677,559 1,453 1,706 9,167 1,010 690,895 Commercial 455,394 2,416 2,569 7,792 — 468,171 Commercial Loans 199,306 781 1,044 25,102 227 226,460 Municipal Loans 256,543 — — 949 — 257,492 Loans to Individuals 269,204 16 — 871 194 270,285 Total $ 2,118,189 $ 5,528 $ 6,713 $ 49,244 $ 1,459 $ 2,181,133 (1) Includes PCI loans comprised of $0.7 million special mention and $17.8 million substandard as of December 31, 2014 . Nonperforming Assets and Past Due Loans Nonaccrual loans are loans 90 days or more delinquent and collection in full of both the principal and interest is not expected. Additionally, some loans that are not delinquent may be placed on nonaccrual status due to doubts about full collection of principal or interest. When a loan is categorized as nonaccrual, the accrual of interest is discontinued and any accrued balance is reversed for financial statement purposes. Payments received on nonaccrual loans are applied to the outstanding principal balance. Payments of contractual interest are recognized as income only to the extent that full recovery of the principal balance of the loan is reasonably certain. Loans are returned to accrual status when all the principal and interest amounts contractually due are brought current and future payments are reasonably assured. Other factors, such as the value of collateral securing the loan and the financial condition of the borrower, are considered in judgments as to potential loan loss. Nonaccrual loans and accruing loans past due more than 90 days include both smaller balance homogeneous loans that are collectively evaluated for impairment and individually classified impaired loans. PCI loans are recorded at fair value at acquisition date. Although the PCI loans may be contractually delinquent, we do not classify these loans as past due or nonperforming as the loans were written down to fair value at the acquisition date and the accretable yield is recognized in interest income over the remaining life of the loan. However, subsequent to acquisition, we re-assess PCI loans for additional impairment and record additional impairment in the event we conclude it is probable that we will be unable to collect all cash flows originally expected to be collected at acquisition plus any additional cash flows expected to be collected due to changes in estimates after acquisition. All such PCI loans for which we recognize subsequent impairment are reported as impaired loans in the financial statements. The following table sets forth nonperforming assets for the periods presented (in thousands): At At Nonaccrual loans (1) $ 20,526 $ 4,096 Accruing loans past due more than 90 days (1) 3 4 Restructured loans (2) 11,143 5,874 Other real estate owned 744 1,738 Repossessed assets 64 565 Total Nonperforming Assets $ 32,480 $ 12,277 (1) Excludes PCI loans measured at fair value at acquisition. (2) Includes $7.5 million in PCI loans restructured during the year ended December 31, 2015 . Foreclosed assets include other real estate owned and repossessed assets. For 1-4 family residential real estate properties, a loan is recognized as a foreclosed property once legal title to the real estate property has been received upon completion of foreclosure or the borrower has conveyed all interest in the residential property through a deed in lieu of foreclosure. There were $67,000 in loans secured by 1-4 family residential properties for which formal foreclosure proceedings were in process as of December 31, 2015 . The following table sets forth the recorded investment in nonaccrual by class of loans for the periods presented (in thousands): Nonaccrual Loans (1) December 31, 2015 December 31, 2014 Real Estate Loans: Construction $ 508 $ 716 1-4 Family Residential 1,847 2,017 Commercial 2,816 675 Commercial Loans 13,896 416 Loans to Individuals 1,459 272 Total $ 20,526 $ 4,096 (1) Excludes PCI loans measured at fair value at acquisition. Accruing loans past due more than 90 days were not significant at December 31, 2015 or 2014 . Loans are considered impaired if, based on current information and events, it is probable we will be unable to collect the scheduled payments of principal and interest when due according to the contractual terms of the loan agreement. Impairment is evaluated in total for smaller-balance loans of a similar nature and on an individual loan basis for other loans. The measurement of loss on impaired loans is generally based on the fair value of the collateral if repayment is expected solely from the collateral or the present value of the expected future cash flows discounted at the historical effective interest rate stipulated in the loan agreement. In measuring the fair value of the collateral, in addition to relying on third party appraisals, we use assumptions, such as discount rates, and methodologies, such as comparison to the recent selling price of similar assets, consistent with those that would be utilized by unrelated third parties performing a valuation. Loans that are evaluated and determined not to meet the definition of an impaired loan are reserved for at the general reserve rate for its appropriate class. At the time a loss is probable in the collection of contractual amounts, specific reserves are allocated. Loans are charged off to the liquidation value of the collateral net of liquidation costs, if any, when deemed uncollectible or as soon as collection by liquidation is evident. The following tables set forth impaired loans by class of loans for the periods presented (in thousands): December 31, 2015 Unpaid Contractual Principal Balance Recorded Investment With Allowance Related Allowance for Loan Losses Real Estate Loans: Construction $ 1,320 $ 508 $ 12 1-4 Family Residential 1,842 1,751 25 Commercial 4,756 4,636 137 Commercial Loans 29,844 21,385 4,599 Municipal Loans 637 637 13 Loans to Individuals 288 257 105 Total (1) $ 38,687 $ 29,174 $ 4,891 (1) Includes of $8.0 million of PCI loans that experienced deterioration in credit quality subsequent to the acquisition date. December 31, 2014 Unpaid Contractual Principal Balance Recorded Investment With Allowance Related Allowance for Loan Losses Real Estate Loans: Construction $ 3,183 $ 2,461 $ 43 1-4 Family Residential 4,023 3,854 108 Commercial 1,622 1,605 26 Commercial Loans 1,162 1,011 242 Municipal Loans 699 699 14 Loans to Individuals 321 310 103 Total (1) $ 11,010 $ 9,940 $ 536 (1) PCI loans are excluded from this table as there was no evidence of further deterioration in credit quality as of December 31, 2014 that would indicate it was probable that our recorded investment in these loans would not be recoverable. There were no impaired loans recorded without an allowance for the years ended December 31, 2015 or 2014 . The following tables present the aging of the recorded investment in past due loans by class of loans (in thousands): December 31, 2015 30-59 Days Past Due 60-89 Days Past Due Greater than 90 Days Past Due Total Past Due Current (1) Total Real Estate Loans: Construction $ 121 $ 258 $ 208 $ 587 $ 437,660 $ 438,247 1-4 Family Residential 3,703 781 1,080 5,564 649,846 655,410 Commercial 359 1,289 361 2,009 633,201 635,210 Commercial Loans 527 138 335 1,000 241,527 242,527 Municipal Loans — — — — 288,115 288,115 Loans to Individuals 2,457 608 285 3,350 168,894 172,244 Total $ 7,167 $ 3,074 $ 2,269 $ 12,510 $ 2,419,243 $ 2,431,753 December 31, 2014 30-59 Days Past Due 60-89 Days Past Due Greater than 90 Days Past Due Total Past Due Current (1) Total Real Estate Loans: Construction $ 376 $ 42 $ 716 $ 1,134 $ 266,696 $ 267,830 1-4 Family Residential 3,511 509 2,017 6,037 684,858 690,895 Commercial 1,203 — 675 1,878 466,293 468,171 Commercial Loans 397 3 416 816 225,644 226,460 Municipal Loans — — — — 257,492 257,492 Loans to Individuals 362 66 276 704 269,581 270,285 Total $ 5,849 $ 620 $ 4,100 $ 10,569 $ 2,170,564 $ 2,181,133 (1) Includes PCI loans measured at fair value. The following table sets forth average recorded investment and interest income recognized on impaired loans by class of loans for the periods presented (in thousands): December 31, 2015 December 31, 2014 December 31, 2013 Average Recorded Investment (1) Interest Income Recognized (1) Average Recorded Investment (1) Interest Income Recognized (1) Average Recorded Investment Interest Income Recognized Real Estate Loans: Construction $ 1,518 $ — $ 1,346 $ 4 $ 1,707 $ — 1-4 Family Residential 3,410 61 3,511 67 2,915 76 Commercial 3,323 64 2,173 52 1,972 72 Commercial Loans 13,807 256 1,286 26 1,935 19 Municipal Loans 824 37 750 41 292 16 Loans to Individuals 725 4 1,920 3 3,149 449 Total $ 23,607 $ 422 $ 10,986 $ 193 $ 11,970 $ 632 (1) Excludes PCI loans measured at fair value at acquisition that have not experienced further deterioration in credit quality subsequent to the acquisition date. Troubled Debt Restructurings The restructuring of a loan is considered a TDR if both (i) the borrower is experiencing financial difficulties and (ii) the creditor has granted a concession. Concessions may include interest rate reductions or below market interest rates, restructuring amortization schedules and other actions intended to minimize potential losses. The following tables set forth the recorded balance at December 31, 2015 and 2014 of loans considered to be TDRs that were restructured during the periods presented (dollars in thousands): Year Ended December 31, 2015 Extend Amortization Period Interest Rate Reductions Combination (1) Total Modifications Number of Contracts Real Estate Loans: 1-4 Family Residential $ — $ 80 $ 255 $ 335 3 Commercial 438 — 1,290 1,728 4 Commercial Loans 13,249 — 7,507 20,756 12 Loans to Individuals 60 — 130 190 14 Total $ 13,747 $ 80 $ 9,182 $ 23,009 33 Year Ended December 31, 2014 Extend Amortization Period Interest Rate Reductions Combination (1) Total Modifications Number of Contracts Real Estate Loans: Construction $ 1,746 $ — $ — $ 1,746 1 1-4 Family Residential — 280 374 654 3 Commercial 558 — 391 949 3 Commercial Loans 291 — 172 463 6 Loans to Individuals 5 10 68 83 8 Total $ 2,600 $ 290 $ 1,005 $ 3,895 21 (1) These modifications may include an extension of the amortization period, interest rate reduction, and/or converting the loan to interest-only for a limited period of time. The majority of loans restructured as TDRs during the year ended December 31, 2015 were modified with maturity extensions. Interest continues to be charged on principal balances outstanding during the extended term. Therefore, the financial effects of the recorded investment of loans restructured as TDRs during the years ended December 31, 2015 and 2014 were not significant. During the year ended December 31, 2015 , a $12.4 million commercial loan, previously impaired and placed in nonaccrual status was restructured as a TDR. In addition, a $7.5 million PCI commercial loan was restructured as a TDR during the year ended December 31, 2015 and resulted in additional provision of approximately $633,000 . Generally, the loans identified as TDRs were previously reported as impaired loans prior to restructuring and therefore the modification did not impact our determination of the allowance for loan losses. On an ongoing basis, the performance of the TDRs is monitored for subsequent payment default. Payment d

PREMISES AND EQUIPMENT

PREMISES AND EQUIPMENT	12 Months Ended
	Dec. 31, 2015
Property, Plant and Equipment [Abstract]
PREMISES AND EQUIPMENT	PREMISES AND EQUIPMENT December 31, 2015 December 31, 2014 (in thousands) Premises $ 124,626 $ 121,740 Furniture and equipment 35,069 36,045 159,695 157,785 Less: accumulated depreciation 51,766 44,925 Total $ 107,929 $ 112,860 During the years ended December 31, 2015 and 2014 , assets with accumulated depreciation of $1.2 million and $614,000 , respectively, were written off. Depreciation expense was $8.1 million , $3.3 million , and $3.7 million for the years ended December 31, 2015 , 2014 and 2013 , respectively.

DEPOSITS

DEPOSITS	12 Months Ended
	Dec. 31, 2015
Deposits [Abstract]
DEPOSITS	DEPOSITS December 31, 2015 December 31, 2014 (in thousands) Noninterest bearing demand deposits: Private accounts $ 651,992 $ 640,450 Public accounts 20,478 20,564 Total noninterest bearing demand deposits 672,470 661,014 Interest bearing deposits: Private accounts: Savings deposits 233,157 226,267 Money market demand deposits 341,432 379,149 Platinum money market deposits 323,526 291,473 Interest bearing checking 177,409 11,863 NOW demand deposits 253,041 409,737 Certificates and other time deposits of $250,000 or more 57,209 60,408 Certificates and other time deposits under $250,000 498,901 493,125 Total private accounts 1,884,675 1,872,022 Public accounts: Savings deposits 15 9 Money market demand deposits 22,518 22,656 Platinum money market deposits 383,716 398,333 Interest bearing checking 6,679 35 NOW demand deposits 151,974 132,909 Certificates and other time deposits of $250,000 or more 311,824 268,302 Certificates and other time deposits under $250,000 21,536 19,137 Total public accounts 898,262 841,381 Total interest bearing deposits 2,782,937 2,713,403 Total deposits $ 3,455,407 $ 3,374,417 For the years ended December 31, 2015 , 2014 and 2013 , interest expense on time deposits of $250,000 or more was $1.4 million , $1.1 million and $1.4 million , respectively. At December 31, 2015 , the scheduled maturities of certificates and other time deposits, including public accounts, were as follows (in thousands): 2016 $ 501,440 2017 160,560 2018 136,379 2019 47,368 2020 37,875 2021 and thereafter 5,848 $ 889,470 At December 31, 2015 , we had $85.3 million in brokered certificates of deposit (“CDs”) that represented 2.5% of our deposits. Approximately $64.6 million of our brokered CDs were non-callable with a weighted average cost of 56 basis points and remaining maturities of five to thirteen months. The remaining $20.7 million were long terms CDs that mature within five years and have short-term calls that we control. These brokered CDs are reflected in the CDs under $250,000 category. At December 31, 2014 , we had $23.4 million in brokered CDs. We utilized long-term brokered CDs because the brokered CDs better matched overall ALCO objectives at the time of issuance by protecting us with fixed rates should interest rates increase, while providing us options to call the funding should interest rates decrease. Our current policy allows for a maximum of $180 million in brokered CDs. At December 31, 2015 and 2014 , we had approximately $11.6 million and $10.7 million , respectively, in deposits from related parties, including directors and named executive officers. The aggregate amount of demand deposit overdrafts that have been reclassified as loans were $637,000 and $2.8 million at December 31, 2015 and 2014 , respectively.

SHORT-TERM BORROWINGS

SHORT-TERM BORROWINGS	12 Months Ended
	Dec. 31, 2015
Short-term Debt [Abstract]
SHORT-TERM BORROWINGS	SHORT-TERM BORROWINGS Information related to short-term borrowings is provided in the table below: Years Ended December 31, 2015 2014 (dollars in thousands) Federal funds purchased and repurchase agreements Balance at end of period $ 2,429 $ 4,237 Average amount outstanding during the period (1) 2,277 1,886 Maximum amount outstanding during the period (2) 2,429 4,237 Weighted average interest rate during the period (3) 0.1 % 0.2 % Interest rate at end of period 0.1 % 1.4 % FHLB advances Balance at end of period $ 645,407 $ 297,368 Average amount outstanding during the period (1) 382,417 62,240 Maximum amount outstanding during the period (2) 656,431 297,368 Weighted average interest rate during the period (3) 0.3 % 0.9 % Interest rate at end of period 0.5 % 0.4 % (1) The average amount outstanding during the period was computed by dividing the total daily outstanding principal balances by the number of days in the period. (2) The maximum amount outstanding at any month-end during the period. (3) The weighted average interest rate during the period was computed by dividing the actual interest expense by the average balance outstanding during the period. Southside Bank has three unsecured lines of credit for the purchase of overnight federal funds at prevailing rates with Frost Bank, TIB – The Independent Bankers Bank and Comerica Bank for $30.0 million , $15.0 million and $7.5 million , respectively. Southside Bank has a $5.0 million line of credit with Frost Bank to be used to issue letters of credit and at December 31, 2015 , we had one outstanding letter of credit for $195,000 . At December 31, 2015 , the amount of additional funding Southside Bank could obtain from FHLB using unpledged securities at FHLB was approximately $606.9 million , net of FHLB stock purchases required. There were no federal funds purchased at December 31, 2015 or 2014 . Southside Bank obtained no letters of credit from FHLB as collateral for its public fund deposits. Southside Bank enters into sales of securities under agreements to repurchase (“repurchase agreements”). These repurchase agreements totaled $2.4 million and $4.2 million at December 31, 2015 and 2014 , respectively, and had maturities of less than one year. These repurchase agreements are secured by investment securities and are stated at the amount of cash received in connection with the transaction.

LONG-TERM OBLIGATIONS

LONG-TERM OBLIGATIONS	12 Months Ended
	Dec. 31, 2015
Debt Disclosure [Abstract]
LONG-TERM OBLIGATIONS	LONG-TERM OBLIGATIONS Years Ended December 31, 2015 2014 (dollars in thousands) FHLB advances Balance at end of period $ 502,281 $ 600,052 Weighted average interest rate during the period (1) 1.3 % 1.4 % Interest rate at end of period 1.3 % 1.3 % Long-term debt (2) Balance at end of period $ 60,311 $ 60,311 Weighted average interest rate during the period (1) 2.4 % 2.4 % Interest rate at end of period 2.6 % 2.3 % (1) The weighted average interest rate during the period was computed by dividing the actual interest expense by the average balance outstanding during the period. (2) This long-term debt consists of trust preferred securities that qualify under the risk-based capital guidelines as Tier 1 capital, subject to certain limitations. Maturities of fixed rate long-term obligations based on scheduled repayments at December 31, 2015 are as follows (in thousands): Years Ended December 31, 2016 2017 2018 2019 2020 Thereafter Total FHLB advances $ 1,093 $ 288,808 $ 78,288 $ 42,348 $ 76,016 $ 15,728 $ 502,281 Long-term debt — — — — — 60,311 60,311 Total long-term obligations $ 1,093 $ 288,808 $ 78,288 $ 42,348 $ 76,016 $ 76,039 $ 562,592 FHLB advances represent borrowings with fixed interest rates ranging from 0.8% to 5.0% and with maturities of one to thirteen years. FHLB advances are collateralized by FHLB stock, nonspecified real estate loans and MBS. During the fourth quarter of 2015 , the Company entered into a $20.0 million variable rate advance agreement with FHLB to pay one-month LIBOR plus 0.17% . In addition, the Company entered into an interest rate swap contract that is treated as a cash flow hedge under ASC 815 that effectively converted the variable rate advance to a fixed interest rate of 1.529% for five years. The cash flows of the swap are expected to be effective in hedging the variability in expected future cash flows attributable to fluctuations in the one-month LIBOR interest rate. Proceeds were used for general corporate purposes. Years Ended December 31, 2015 2014 (in thousands) Long-term debt Southside Statutory Trust III Due 2033 (1) $ 20,619 $ 20,619 Southside Statutory Trust IV Due 2037 (2) 23,196 23,196 Southside Statutory Trust V Due 2037 (3) 12,887 12,887 Magnolia Trust Company I Due 2035 (4) 3,609 3,609 Total Long-term Debt $ 60,311 $ 60,311 (1) This debt carries an adjustable rate of 3.5467% through March 30, 2016 and adjusts quarterly at a rate equal to three-month LIBOR plus 294 basis points. (2) This debt carried an adjustable rate of 1.6219% through January 29, 2016 and reset to 1.9156% through April 29, 2016 . This debt adjusts quarterly at a rate equal to three-month LIBOR plus 130 basis points. (3) This debt carries an adjustable rate of 2.762% through March 14, 2016 and adjusts quarterly at a rate equal to three-month LIBOR plus 225 basis points. (4) This debt carried an adjustable rate of 2.1776% through February 22, 2016 and reset to 2.4182% through May 22, 2016 . This debt adjusts quarterly at a rate equal to three-month LIBOR plus 180 basis points.

EMPLOYEE BENEFITS

EMPLOYEE BENEFITS	12 Months Ended
	Dec. 31, 2015
Employee Benefits Including Defined Benefit Plans and Share-based Compensation Plans [Abstract]
EMPLOYEE BENEFITS	EMPLOYEE BENEFITS Deferred Compensation Agreements Southside Bank has deferred compensation agreements with 17 of its executive officers, which generally provide for payment of an aggregate amount of $6.1 million over a maximum period of 15 years after retirement or death. Of the 17 executives included in the agreements, payments have commenced to five former executives and/or their beneficiaries. In addition, one active executive was eligible for retirement at December 31, 2015 . Three executive officers became eligible to receive payments in 2016 as a result of the acceptance of an early retirement package offered in late December of 2015. Payments to these three executives will commence in 2016. Deferred compensation expense was $553,000 , $224,000 and $589,000 for the years ended December 31, 2015 , 2014 and 2013 , respectively. At December 31, 2015 and 2014 , the deferred compensation plan liability totaled $3.9 million and $3.8 million , respectively. Health Insurance We provide accident and health insurance for substantially all employees through a self-funded insurance program. The cost of health care benefits was $6.0 million , $4.6 million and $4.0 million for the years ended December 31, 2015 , 2014 and 2013 , respectively. Our healthcare plan was amended to provide health insurance coverage for any retiree having 50 years of service with the Company. In addition, the eligible retiree must have Medicare coverage, including part A, part B and part D. Premiums paid will be billed at the Consolidated Omnibus Budget Reconciliation Act (“COBRA”) rates. There were two retirees participating in the health insurance plan as of December 31, 2015 . There were no retirees participating as of December 31, 2014 or 2013 . Employee Stock Ownership Plan We have an Employee Stock Ownership Plan (the “ESOP”) which covers substantially all employees. Contributions to the ESOP are at the sole discretion of the board of directors. We contributed $350,000 to the ESOP for the year ended December 31, 2015 and $250,000 for each of the years ended December 31, 2014 and 2013 . At December 31, 2015 and 2014 , the ESOP owned 310,646 and 351,936 shares of common stock, respectively. The number of shares has been adjusted as a result of stock dividends. These shares are treated as externally held shares for dividend and earnings per share calculations. Long-term Disability We have an officer’s long-term disability income policy which provides coverage in the event they become disabled as defined under its terms. Individuals are automatically covered under the policy if they (a) have been elected as an officer, (b) have been an employee of Southside Bank for three years and (c) receive earnings of $50,000 or more on an annual basis. The policy provides, among other things, that should a covered individual become totally disabled he would receive two-thirds of his current salary, not to exceed $15,000 per month. The benefits paid out of the policy are limited by the benefits paid to the individual under the terms of our other Company-sponsored benefit plans. Split Dollar Agreements We entered into split dollar agreements with eight of our executive officers. The agreements provide we will be the beneficiary of bank owned life insurance (“BOLI”) insuring the executives’ lives. The agreements provide the executives the right to designate the beneficiaries of the death benefits guaranteed in each agreement. The agreements originally provided for death benefits of an initial aggregate amount of $4.5 million . The individual amounts are increased annually on the anniversary date of the agreement by inflation adjustment factors ranging from 3% to 5% . During 2013, death benefits of approximately $1.1 million were paid pursuant to such agreements. As of December 31, 2015 , the expected death benefits total $5.0 million . The agreements also state that after the executive’s retirement, we shall also pay an annual gross-up bonus to the executive in an amount sufficient to enable the executive to pay federal income tax on both the economic benefit and on the gross-up bonus. The expense required to record the post retirement liability associated with the split dollar post retirement bonuses was $28,000 , $7,000 and $26,000 for the years ended December 31, 2015 , 2014 and 2013 , respectively. For the years ended December 31, 2015 and 2014 , the split dollar liability totaled $1.9 million and $1.6 million , respectively. 401(k) Plan We have a 401(k) defined contribution plan (the “401(k) Plan”) covering substantially all employees, who have completed one year of service and are age 21 or older. A participant may elect to defer a percentage of their compensation subject to certain limits based on federal tax laws. For the years ended December 31, 2015 , 2014 and 2013 , expense attributable to the 401(k) Plan amounted to $447,000 , $171,000 and $227,000 , respectively. Pension Plans We have a defined benefit pension plan (“the Plan”) pursuant to which participants are entitled to benefits based on final average monthly compensation and years of credited service determined in accordance with plan provisions. Entrance into the Plan by new employees was frozen effective December 31, 2005. Employees hired after December 31, 2005 are not eligible to participate in the plan. All participants in the Plan are fully vested. Benefits are payable monthly commencing on the later of age 65 or the participant’s date of retirement. Eligible participants may retire at reduced benefit levels after reaching age 55 . We contribute amounts to the pension fund sufficient to satisfy funding requirements of the Employee Retirement Income Security Act. Plan assets included 223,615 shares of our stock at December 31, 2015 and 2014 . Our stock included in the Plan assets was purchased at fair value. The number of shares has been adjusted as a result of stock dividends. During 2015 , our funded status improved and at December 31, 2015 , we had an unfunded status of $3.7 million compared to an unfunded status of $4.3 million at December 31, 2014 . The improvement was a result of an increase in the discount rate and the updated mortality assumption at December 31, 2015 compared to December 31, 2014 , partially offset by lower than expected returns on the fair value of plan assets since December 31, 2014 . Additionally, the Plan provided special and contractual termination benefits of $176,000 to an employee that accepted an early retirement package during the year ended December 31, 2015 . In late December 2015, we offered an early retirement package to 24 of our employees, of which 16 accepted the early retirement offer by the acceptance deadline of January 29, 2016 . In connection with the acquisition of Omni, we acquired the OmniAmerican Bank Defined Benefit Plan ( “the Acquired Plan”) which was remeasured at fair value. The Acquired Plan originally called for benefits to be paid to eligible employees at retirement based primarily upon years of service and the compensation levels at retirement. As of December 31, 2006, the benefits under the Acquired Plan were frozen. No further benefits will be earned by employees after that date. In addition, no new participants may be added to the Acquired Plan after December 31, 2006. During 2015, our funded status improved and at December 31, 2015 , we had an unfunded status of $945,000 compared to an unfunded status of $1.5 million at December 31, 2014 . The improvement was primarily a result of an increase in the discount rate. We have a nonfunded supplemental retirement plan (the “Restoration Plan”) for our employees whose benefits under the principal retirement plan are reduced because of compensation deferral elections or limitations under federal tax laws. Both the Plan and the Restoration Plan were amended effective January 1, 2013 to change the formula for determining death benefits for participants who die while in service of the employer and who are early retirement eligible on their date of death. We use a measurement date of December 31 for our plans. 2015 2014 2013 Defined Benefit Pension Plan Defined Restoration Plan Defined Benefit Pension Plan Defined Restoration Plan Defined Benefit Pension Plan Restoration Plan (in thousands) Change in Projected Benefit Obligation: Benefit obligation at end of prior year $ 84,050 $ 5,977 $ 13,259 $ 70,046 $ — $ 10,848 $ 78,002 $ 9,801 Service cost 1,838 — 334 1,697 — 275 2,118 298 Interest cost 3,410 238 668 3,497 — 563 3,155 468 Actuarial (gain) loss (6,777 ) (753 ) (1,968 ) 13,146 — 1,813 (11,642 ) 344 Benefits paid (2,590 ) (28 ) (269 ) (4,118 ) — (240 ) (1,776 ) (120 ) Expenses paid (67 ) (30 ) — (175 ) — — (111 ) — Plan acquired through acquisition (1) — — — — 5,977 — — — Plan amendments — — — (43 ) — — 300 57 Settlements — (719 ) — — — — — — Special and contractual termination benefits 176 — — — — — — — Benefit obligation at end of year 80,040 4,685 12,024 84,050 5,977 13,259 70,046 10,848 Change in Plan Assets: Fair value of plan assets at end of prior year 79,730 4,512 — 78,990 — — 63,165 — Actual return (718 ) 5 — 5,033 — — 12,712 — Employer contributions — — 269 — — 240 5,000 120 Benefits paid (2,590 ) (28 ) (269 ) (4,118 ) — (240 ) (1,776 ) (120 ) Expenses paid (67 ) (30 ) — (175 ) — — (111 ) — Settlements — (719 ) — — — — — — Plan acquired through acquisition (1) — — — — 4,512 — — — Fair value of plan assets at end of year 76,355 3,740 — 79,730 4,512 — 78,990 — (Un)Funded status at end of year (3,685 ) (945 ) (12,024 ) (4,320 ) (1,465 ) (13,259 ) 8,944 (10,848 ) Accrued benefit (liability) asset recognized $ (3,685 ) $ (945 ) $ (12,024 ) $ (4,320 ) $ (1,465 ) $ (13,259 ) $ 8,944 $ (10,848 ) Accumulated benefit obligation at end of year $ 69,737 $ 4,685 $ 10,290 $ 71,201 $ 5,977 $ 10,811 $ 57,283 $ 8,088 (1) Defined benefit plan acquired with the acquisition of Omni on December 17, 2014. Amounts related to our defined benefit pension plans and restoration plan recognized as a component of other comprehensive (loss) income were as follows (in thousands): 2015 2014 2013 Defined Defined Restoration Defined Restoration Defined Restoration Recognition of net loss $ 1,505 $ — $ 943 $ 543 $ 499 $ 2,197 $ 590 Recognition of prior service (credit) cost (23 ) — 7 (19 ) 5 (42 ) (1 ) Recognition of gain due to settlement — (62 ) — — — — — Net gain (loss) occurring during the year 375 463 1,968 (13,761 ) (1,813 ) 19,559 (344 ) Net prior service credit (cost) occurring during the year — — — 43 — (300 ) (57 ) 1,857 401 2,918 (13,194 ) (1,309 ) 21,414 188 Deferred tax (expense) benefit (650 ) (141 ) (1,021 ) 4,618 458 (7,495 ) (66 ) Other comprehensive income (loss), net of tax $ 1,207 $ 260 $ 1,897 $ (8,576 ) $ (851 ) $ 13,919 $ 122 Net amounts recognized in net periodic benefit cost and other comprehensive loss as of December 31, 2015 and 2014 were as follows (in thousands): 2015 2014 Defined Benefit Pension Plan Defined Restoration Plan Defined Restoration Plan Net loss $ 1,505 $ — $ 943 $ 543 $ 499 Prior service (credit) cost (23 ) — 7 (19 ) 5 Gain recognized due to settlement — (62 ) — — — 1,482 (62 ) 950 524 504 Deferred tax (expense) benefit (519 ) 22 (333 ) (183 ) (176 ) Accumulated other comprehensive income (loss), net of tax $ 963 $ (40 ) $ 617 $ 341 $ 328 Amounts recognized as a component of accumulated other comprehensive loss as of December 31, 2015 and 2014 were as follows (in thousands): 2015 2014 Defined Defined Restoration Defined Restoration Net (loss) gain $ (25,956 ) $ 401 $ (2,816 ) $ (27,836 ) $ (5,727 ) Prior service credit (cost) 40 — (44 ) 62 (50 ) (25,916 ) 401 (2,860 ) (27,774 ) (5,777 ) Deferred tax benefit 9,071 (141 ) 1,001 9,721 2,022 Accumulated other comprehensive (loss) income, net of tax $ (16,845 ) $ 260 $ (1,859 ) $ (18,053 ) $ (3,755 ) Net periodic pension cost and postretirement benefit cost for the years ended December 31, 2015 , 2014 and 2013 included the following components (in thousands): 2015 2014 2013 Defined Benefit Pension Plan Service cost $ 1,838 $ 1,697 $ 2,118 Interest cost 3,410 3,497 3,155 Expected return on assets (5,684 ) (5,648 ) (4,795 ) Net loss amortization 1,505 543 2,197 Prior service credit amortization (23 ) (19 ) (42 ) Special and contractual termination benefits 176 — — Net periodic benefit cost $ 1,222 $ 70 $ 2,633 Defined Benefit Pension Plan Acquired Service cost $ — $ — $ — Interest cost 238 — — Expected return on assets (294 ) — — Net loss amortization — — — Prior service credit amortization — — — Gain recognized due to settlement (62 ) — — Net periodic benefit cost $ (118 ) $ — $ — Restoration Plan Service cost $ 334 $ 275 $ 298 Interest cost 668 563 468 Net loss amortization 943 499 590 Prior service cost (credit) amortization 7 5 (1 ) Net periodic benefit cost $ 1,952 $ 1,342 $ 1,355 The amounts in accumulated other comprehensive income (loss) that are expected to be recognized as components of net periodic benefit cost during 2016 are as follows (in thousands): Defined Benefit Pension Plan Defined Restoration Net loss $ 1,408 $ — $ 214 Prior service (credit) cost (23 ) — 6 1,385 — 220 Deferred tax benefit (485 ) — (77 ) Accumulated other comprehensive loss, net of tax $ 900 $ — $ 143 The Plan and Acquired Plan assets, which consist primarily of marketable equity and debt instruments, are valued using market quotations in active markets for identical assets, market quotations for similar assets in active or non-active markets or the net asset value (NAV) provided by the plan administrator. The Plans' obligations and the annual pension expense are determined by independent actuaries and through the use of a number of assumptions. Key assumptions in measuring the Plans' obligations include the discount rate, the rate of salary increases and the estimated future return on plan assets. In determining the discount rate, we utilized a cash flow matching analysis to determine a range of appropriate discount rates for the defined benefit pension plan and restoration plan. In developing the cash flow matching analysis, we had our actuaries construct a portfolio of high quality noncallable bonds to match as closely as possible the timing of future benefit payments of the plans at December 31, 2015 . We utilized a bond selection-settlement approach that selects a portfolio of bonds from a universe of high quality corporate bonds rated Aa by at least half of the rating agencies available. Based on the results of this cash flow matching analysis, we were able to determine an appropriate discount rate. Salary increase assumptions are based upon historical experience and anticipated future management actions. The expected long-term rate of return assumption reflects the average return expected based on the investment strategies and asset allocation of the assets invested to provide for the Plans' liabilities. We considered broad equity and bond indices, long-term return projections, and actual long-term historical Plan performance when evaluating the expected long-term rate of return assumption. At December 31, 2015 and 2014 , the assumptions used to determine the benefit obligation were as follows: 2015 2014 Defined Benefit Defined Restoration Defined Defined Restoration Discount rate 4.56 % 4.56 % 4.56 % 4.14 % 4.14 % 4.14 % Compensation increase rate 3.50 % — 3.50 % 3.50 % — 3.50 % For the years ended December 31, 2015 , 2014 , and 2013 , the assumptions used to determine net periodic pension cost and postretirement benefit cost were as follows: 2015 2014 2013 Defined Benefit Pension Plan Discount rate 4.14 % 5.06 % 4.08 % Expected long-term rate of return on plan assets 7.25 % 7.25 % 7.25 % Compensation increase rate 3.50 % 4.50 % 4.50 % Defined Benefit Pension Plan Acquired Discount rate 4.14 % — — Expected long-term rate of return on plan assets 7.25 % — — Compensation increase rate — — — Restoration Plan Discount rate 4.14 % 5.06 % 4.08 % Compensation increase rate 3.50 % 4.50 % 4.50 % Material changes in pension benefit costs may occur in the future due to changes in these assumptions. Future annual amounts could be impacted by changes in the number of SSB Plan participants, changes in the level of benefits provided, changes in the discount rates, changes in the expected long-term rate of return, changes in the level of contributions to the Plan and other factors. The major categories of assets in our Plan and the Acquired Plan are presented in the following table. Assets are segregated by the level of the valuation inputs within the fair value hierarchy established by ASC Topic 820 “Fair Value Measurements and Disclosures,” utilized to measure fair value (see “Note 12 – Fair Value Measurement”). Our Restoration Plan is unfunded. December 31, 2015 2014 Defined Defined Defined Defined Level 1: (in thousands) Cash $ 588 $ — $ 2,176 $ — Equity Securities: U.S. large cap (1) 26,098 — 25,550 752 U.S. mid cap (2) 7,527 — 7,653 387 U.S. small cap (3) 6,186 — 7,000 1,159 Fixed Income Securities: Corporate bonds (4) — — — 357 International developed (5) 2,975 — 3,320 340 International emerging (2) 1,108 — 1,302 359 Level 2: Cash Equivalents 13,491 — 17,548 — Equity Securities: U.S. large cap — 1,231 — 382 U.S. mid cap — 157 — 415 U.S. small cap — 156 — — International — 514 — — Fixed Income Securities: Corporate bonds (4) 1,443 376 794 — U.S. government agencies (4) 9,116 — 3,583 — Municipal bonds (4) 7,365 — 10,202 — U.S. agency mortgage-backed securities (6) 458 — 602 361 Asset-backed securities (7) — 729 — — Real estate (8) — 189 — — Balanced Asset Allocation (9) — 189 — — Other (10) — 199 — — Total fair value of plan assets $ 76,355 $ 3,740 $ 79,730 $ 4,512 (1) This category is comprised of individual securities that are actively managed and a broadly diversified "passive" mutual fund. (2) This category is comprised of broadly diversified ‘passive’ mutual funds. (3) For the defined benefit pension plan, this category is comprised primarily of Southside Bancshares stock that is owned in the Plan and a broadly diversified "passive" mutual fund. (4) This category is comprised of individual investment grade securities that are generally held to maturity in the Plan. The Acquired Plan assets in this category consist of investment grade and below investment grade bonds. (5) This category is comprised of a broadly ‘passive’ mutual fund. (6) This category is comprised of individual securities that are generally not held to maturity. (7) This category is mainly comprised of asset backed securities, residential mortgage backed securities, commercial mortgage backed securities and corporate bonds. (8) This category is comprised of commercial real estate and includes mortgage loans which are backed by the associated properties. (9) This category is comprised of a combination of fixed income and equity investment options. (10) This category is comprised of a broad range of instruments including, but not limited to, equities, bonds, currencies, convertible securities and derivatives such as futures, options, swaps and forwards. We did not have any plan assets with Level 3 input fair value measurements at December 31, 2015 or 2014 . Due to asset allocation model changes, there were transfers between Level 1 and Level 2 during the year ended December 31, 2015 . Our overall investment strategy is to realize long-term growth of the plan within acceptable risk parameters, while funding benefit payments from dividend and interest income, to the extent possible. The target allocations for plan assets are 55.0% equities, 44.5% fixed income and 0.5% cash equivalents. Equity securities are diversified among U.S. and international (both developed and emerging), large, mid and small caps, and value and growth securities. The investment objective of equity funds is long-term capital appreciation with current income. Fixed income securities include U.S. Treasury securities, agencies, CDs, corporate bonds, and MBS. The investment objective of fixed income funds is to maximize investment return while preserving investment principal. Mutual funds, primarily because of the superior diversification they provide, are used to provide specific international developed and emerging market exposure. As of December 31, 2015 , expected future benefit payments related to our defined benefit pension plan, defined benefit pension plan acquired and restoration plan were as follows (in thousands): Defined Benefit Pension Plan Defined Benefit Restoration 2016 $ 2,921 $ 112 $ 346 2017 3,243 56 570 2018 3,565 67 618 2019 3,779 76 668 2020 3,980 230 726 2021 through 2025 22,707 842 4,406 $ 40,195 $ 1,383 $ 7,334 We expect to contribute $3.0 million to the Plan in 2016 . We expect to contribute approximately $258,000 to our restoration plan in 2016 . We do no t expect to make additional contributions to the Acquired Plan in 2016 . Share-based Incentive Plans 2009 Incentive Plan On April 16, 2009, our shareholders approved the Southside Bancshares, Inc. 2009 Incentive Plan (the “2009 Incentive Plan”), which is a stock-based incentive compensation plan. A total of 1,407,103 shares of our common stock were reserved and available for issuance pursuant to awards granted under the 2009 Incentive Plan. Under the 2009 Incentive Plan, we were authorized to grant nonqualified stock options (“NQSOs”), restricted stock units (“RSUs”) or any combination thereof to certain officers. During the years ended December 31, 2015 and 2013, we granted RSUs and NQSOs pursuant to the 2009 Incentive Plan. There were no awards granted during 2014. As of December 31, 2015 , there were 520,756 unvested awards outstanding. For the year ended December 31, 2015 , there was $1.4 million of share-based compensation expense related to the 2009 Incentive Plan. For the year ended December 31, 2015 , there was $488,000 of income tax benefit related to the stock compensation expense. As of December 31, 2014 , there were 244,147 unvested awards outstanding. As of December 31, 2013 , there were 437,578 unvested awards outstanding. There was share-based compensation expense and income tax benefit for the year ended December 31, 2014 of $1.1 million and $379,000 , respectively. There was share-based compensation expense and income tax benefit for the year ended December 31, 2013 of $911,000 and $319,000 , respectively. As of December 31, 2015 and December 31, 2014 , there was $4.0 million and $1.8 million of unrecognized compensation cost related to the 2009 Incentive Plan, respectively. The remaining cost at December 31, 2015 is expected to be recognized over a weighted-average period of 2.92 years . There was $3.2 million unrecognized compensation expense related to the 2009 Incentive Plan as of December 31, 2013 . The NQSOs have contractual terms of 10 years and vest in equal annual installments over either a three - or four -year period. The fair value of each RSU is the ending stock price on the date of grant. The RSUs vest in equal annual installments over either a three - or four -year period. Each award is evidenced by an award agreement that specifies the option price, if applicable, the duration of the award, the number of shares to which the award pertains, and such other provisions as the Board determines. Shares issued in connection with stock compensation awards are issued from available authorized shares and not from treasury shares. During 2015 , 28,651 shares were issued in connection with stock compensation awards. During 2014 and 2013 , 88,908 shares and 33,802 shares, respectively, were issued in connection with stock compensation awards. The estimated weighted-average grant-date fair value per option and the underlying Black-Scholes option-pricing model assumptions are summarized in the following table for years in which we granted NQSO's pursuant to the 2009 plan: Years Ended December 31, 2015 2014 2013 Weighted-average grant date fair value per option $6.29 $— $8.58 Weighted-average assumptions: Risk-free interest rates 2.01% — 2.23% Expected dividend yield 3.24% — 3.10% Expected volatility factors of the market price of Southside Bancshares common stock 30.91% — 40.88% Expected option life (in years) 6.3 — 6.9 A combined summary of activity in our share-based plans as of December 31, 2015 is presented below: Restricted Stock Units Outstanding Stock Options Outstanding Shares Available for Grant Number of Shares Weighted- Average Grant-Date Fair Value Number of Shares Weighted- Average Exercise Price Weighted- Average Grant-Date Fair Value Balance, January 1, 2015 821,604 31,753 $ 21.75 419,334 $ 19.88 $ 6.00 Granted (427,587 ) 57,482 27.63 370,105 28.08 6.29 Stock options exercised — — — (12,895 ) 18.27 5.45 Stock awards vested — (16,497 ) 20.33 — — — Forfeited 32,018 (3,324 ) 25.14 (28,694 ) 24.29 6.69 Canceled/expired 1,254 — — (1,254 ) 24.62 7.78 Balance, December 31, 2015 427,289 69,414 $ 26.79 746,596 $ 23.79 $ 6.12 Other information regarding options outstanding and exercisable as of December 31, 2015 is as follows: Options Outstanding Options Exercisable Range of Exercise Prices Number Weighted- Weighted- Number Weighted- $ 15.79 - 20.00 248,088 $ 17.11 6.08 219,829 $ 16.98 20.01 - 25.00 142,574 24.62 7.92 75,425 24.62 25.01 - 28.51 355,934 28.12 9.39 — — Total 746,596 $ 23.79 8.01 295,254 $ 18.93 The total intrinsic value of outstanding in-the-money stock options and outstanding in-the-money exercisable stock options was $1.7 million and $1.5 million at December 31, 2015 , respectively. The total intrinsic value of stock options exercised during the years ended December 31, 2015 , 2014 and 2013 was $119,000 , $1.0 million and $97,000 , respectively. Cash received from stock option exercises for the years ended December 31, 2015 , 2014 and 2013 was $236,000 , $1.2 million and $206,000 , respectively. The tax benefit realized for the deductions related to stock awards was $75,000 and $65,000 for the years ended December 31, 2015 and 2013 , respectively. The tax expense related to stock awards was $76,000 for the year ended December 31, 2014 .

FAIR VALUE MEASUREMENT

FAIR VALUE MEASUREMENT	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
FAIR VALUE MEASUREMENT	FAIR VALUE MEASUREMENT Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. A fair value measurement assumes that the transaction to sell the asset or transfer the liability occurs in the principal market for the asset or liability or, in the absence of a principal market, the most advantageous market for the asset or liability. The price in the principal (or most advantageous) market used to measure the fair value of the asset or liability shall not be adjusted for transaction costs. An orderly transaction is a transaction that assumes exposure to the market for a period prior to the measurement date to allow for marketing activities that are usual and customary for transactions involving such assets and liabilities; it is not a forced transaction. Market participants are buyers and sellers in the principal market that are (i) independent, (ii) knowledgeable, (iii) able to transact and (iv) willing to transact. Valuation techniques including the market approach, the income approach and/or the cost approach are utilized to determine fair value. Inputs to valuation techniques refer to the assumptions that market participants would use in pricing the asset or liability. Valuation policies and procedures are determined by our investment department and reported to our Asset/Liability Committee ("ALCO") for review. An entity must consider all aspects of nonperforming risk, including the entity’s own credit standing when measuring fair value of a liability. Inputs may be observable, meaning those that reflect the assumptions market participants would use in pricing the asset or liability developed based on market data obtained from independent sources, or unobservable, meaning those that reflect the reporting entity’s own assumptions about the assumptions market participants would use in pricing the asset or liability developed based on the best information available in the circumstances. A fair value hierarchy for valuation inputs gives the highest priority to quoted prices in active markets for identical assets or liabilities and the lowest priority to unobservable inputs. The fair value hierarchy is as follows: Level 1 Inputs – Unadjusted quoted prices in active markets for identical assets or liabilities that the reporting entity has the ability to access at the measurement date. Level 2 Inputs – Inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly. These might include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability (such as interest rates, volatilities, prepayment speeds, credit risks, etc.) or inputs that are derived principally from or corroborated by market data by correlation or other means. Level 3 Inputs – - Unobservable inputs for determining the fair values of assets or liabilities that reflect an entity's own assumptions about the assumptions that market participants would use in pricing the assets or liabilities. Level 3 assets recorded at fair value on a nonrecurring basis at December 31, 2015 and 2014 , included loans for which a specific allowance was established based on the fair value of collateral and commercial real estate for which fair value of the properties was less than the cost basis. For both asset classes, the unobservable inputs were the additional adjustments applied by management to the appraised values to reflect such factors as non-current appraisals and revisions to estimated time to sell. These adjustments are determined based on qualitative judgments made by management on a case-by-case basis and are not quantifiable inputs, although they are used in the determination of fair value. A description of the valuation methodologies used for assets and liabilities measured at fair value, as well as the general classification of such instruments pursuant to the valuation hierarchy, is set forth below. Certain financial assets are measured at fair value in accordance with GAAP. Adjustments to the fair value of these assets usually result from the application of fair value accounting or write-downs of individual assets. Transfers between levels of the fair value hierarchy are recognized on the actual date of the event or circumstances that caused the transfer, which generally coincides with our monthly and/or quarterly valuation process. There were no transfers between Level 1 and Level 2 during the year ended December 31, 2015 . Securities Available for Sale – U.S. Treasury securities and other equity securities are reported at fair value utilizing Level 1 inputs. Other securities classified as available for sale are reported at fair value utilizing Level 2 inputs. For these securities, we obtain fair value measurements from an independent pricing service. The fair value measurements consider observable data that may include dealer quotes, market spreads, cash flows, the U.S. Treasury yield curve, live trading levels, trade execution data, market consensus prepayment speeds, credit information and the bond’s terms and conditions, among other things. We review the prices supplied by the independent pricing service for reasonableness and to ensure such prices are aligned with traditional pricing matrices. In addition, we obtain an understanding of their underlying pricing methodologies and their Statement on Standards for Attestation Engagements-Reporting on Controls of a Service Organization (“SSAE 16”). We validate prices supplied by the independent pricing service by comparison to prices obtained from, in most cases, three additional third party sources. For securities where prices are outside a reasonable range, we further review those securities to determine what a reasonable price estimate is for that security, given available data. Certain financial assets and financial liabilities are measured at fair value on a nonrecurring basis, that is, the instruments are not measured at fair value on an ongoing basis but are subject to fair value adjustments in certain circumstances (for example, when there is evidence of impairment). Financial assets and financial liabilities measured at fair value on a nonrecurring basis include the following at December 31, 2015 and 2014 . Foreclosed Assets – Foreclosed assets are initially carried at fair value less costs to sell. The fair value measurements of foreclosed assets can include Level 2 measurement inputs such as real estate appraisals and comparable real estate sales information, in conjunction with Level 3 measurement inputs such as cash flow projections, qualitative adjustments, and sales cost estimates. As a result, the categorization of foreclosed assets is Level 3 of the fair value hierarchy. In connection with the measurement and initial recognition of certain foreclosed assets, we may recognize charge-offs through the allowance for loan losses. Impaired Loans – Certain impaired loans may be reported at the fair value of the underlying collateral if repayment is expected solely from the collateral. Collateral values are estimated using Level 3 inputs based on customized discounting criteria or appraisals. At December 31, 2015 and 2014 , the impact of loans with specific reserves based on the fair value of the collateral was reflected in our allowance for loan losses. Certain nonfinancial assets and nonfinancial liabilities measured at fair value on a recurring basis include reporting units measured at fair value and tested for goodwill impairment. The following tables summarize assets measured at fair value on a recurring and nonrecurring basis segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value (in thousands): As of December 31, 2015: Fair Value Measurements at the End of the Reporting Period Using Carrying Amount Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Recurring fair value measurements Investment Securities: U.S. Treasury $ 103,587 $ 103,587 $ — $ — State and Political Subdivisions 244,246 — 244,246 — Other Stocks and Bonds 12,790 — 12,790 — Other Equity Securities 6,016 6,016 — — Mortgage-backed Securities: (1) Residential 588,502 — 588,502 — Commercial 505,351 — 505,351 — Total recurring fair value measurements $ 1,460,492 $ 109,603 $ 1,350,889 $ — Nonrecurring fair value measurements Foreclosed assets $ 808 $ — $ — $ 808 Impaired loans (2) 24,283 — — 24,283 Total nonrecurring fair value measurements $ 25,091 $ — $ — $ 25,091 As of December 31, 2014: Fair Value Measurements at the End of the Reporting Period Using Carrying Amount Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Recurring fair value measurements Investment Securities: U.S. Treasury $ 14,906 $ 14,906 $ — $ — U.S. Government Agency Debentures 4,828 — 4,828 — State and Political Subdivisions 267,684 — 267,684 — Other Stocks and Bonds 13,239 — 13,239 — Other Equity Securities 6,049 6,049 — — Mortgage-backed Securities: (1) Residential 964,298 — 964,298 — Commercial 177,704 — 177,704 — Total recurring fair value measurements $ 1,448,708 $ 20,955 $ 1,427,753 $ — Nonrecurring fair value measurements Foreclosed assets $ 2,303 $ — $ — $ 2,303 Impaired loans (2) 9,404 — — 9,404 Total nonrecurring fair value measurements $ 11,707 $ — $ — $ 11,707 (1) All mortgage-backed securities issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises. (2) Loans represent collateral dependent impaired loans with a specific valuation allowance. Losses on these loans represent charge-offs which are netted against the allowance for loan losses. Disclosure of fair value information about financial instruments, whether or not recognized in the balance sheet is required, for which it is practicable to estimate that value. In cases where quoted market prices are not available, fair values are based on estimates using present value or other estimation techniques. Those techniques are significantly affected by the assumptions used, including the discount rate and estimates of future cash flows. Such techniques and assumptions, as they apply to individual categories of our financial instruments, are as follows: Cash and cash equivalents – The carrying amounts for cash and cash equivalents is a reasonable estimate of those assets' fair value. Investment and mortgage-backed securities held to maturity – Fair values for these securities are based on quoted market prices, where available. If quoted market prices are not available, fair values are based on quoted market prices for similar securities or estimates from independent pricing services. FHLB stock and other investments – The carrying amount of FHLB stock and other investments is a reasonable estimate of those assets’ fair value. Loans receivable – For adjustable rate loans that reprice frequently and with no significant change in credit risk, the carrying amounts are a reasonable estimate of those assets' fair value. The fair value of fixed rate loans is estimated by discounting the future cash flows using the current rates at which similar loans would be made to borrowers with similar credit ratings and for the same remaining maturities. Nonperforming loans are estimated using discounted cash flow analyses or the underlying value of the collateral where applicable. Loans held for sale – The fair value of loans held for sale is determined based on expected proceeds, which are based on sales contracts and commitments. Deposit liabilities – The fair value of demand deposits, savings accounts, and certain money market deposits is the amount on demand at the reporting date, which is the carrying value. Fair values for fixed rate CDs are estimated using a discounted cash flow calculation that applies interest rates currently being offered for deposits of similar remaining maturities. Federal funds purchased and repurchase agreements – Federal funds purchased generally have original terms to maturity of one day and repurchase agreements generally have terms of less than one year, and therefore both are considered short-term borrowings. Consequently, their carrying value is a reasonable estimate of fair value. FHLB advances – The fair value of these advances is estimated by discounting the future cash flows using rates at which advances would be made to borrowers with similar credit ratings and for the same remaining maturities. Long-term debt – The carrying amount for the long-term debt is estimated by discounting future cash flows using estimated rates at which long-term debt would be made to borrowers with similar credit ratings and for the remaining maturities. The following tables present our financial assets, financial liabilities, and unrecognized financial instruments measured on a nonrecurring basis at both their respective carrying amounts and estimated fair value (in thousands): Estimated Fair Value December 31, 2015 Carrying Total Level 1 Level 2 Level 3 Financial Assets: Cash and cash equivalents $ 80,975 $ 80,975 $ 80,975 $ — $ — Investment securities: Held to maturity, at carrying value 385,496 397,194 — 397,194 — Mortgage-backed securities: Held to maturity, at carrying value 398,800 402,569 — 402,569 — FHLB stock and other investments, at cost 56,509 56,509 — 56,509 — Loans, net of allowance for loan losses 2,412,017 2,364,968 — — 2,364,968 Loans held for sale 3,811 3,811 — 3,811 — Financial Liabilities: Retail deposits $ 3,455,407 $ 3,449,002 $ — $ 3,449,002 $ — Federal funds purchased and repurchase agreements 2,429 2,429 — 2,429 — FHLB advances 1,147,688 1,143,218 — 1,143,218 — Long-term debt 60,311 43,695 — 43,695 — Estimated Fair Value December 31, 2014 Carrying Total Level 1 Level 2 Level 3 Financial Assets: Cash and cash equivalents $ 84,655 $ 84,655 $ 84,655 $ — $ — Investment securities: Held to maturity, at carrying value 388,823 400,248 — 400,248 — Mortgage-backed securities: Held to maturity, at carrying value 253,496 261,339 — 261,339 — FHLB stock and other investments, at cost 43,871 43,871 — 43,871 — Loans, net of allowance for loan losses 2,167,841 2,140,088 — — 2,140,088 Loans held for sale 2,899 2,899 — 2,899 — Financial Liabilities: Retail deposits $ 3,374,417 $ 3,369,784 $ — $ 3,369,784 $ — Federal funds purchased and repurchase agreements 4,237 4,237 — 4,237 — FHLB advances 897,420 886,087 — 886,087 — Long-term debt 60,311 43,860 — 43,860 — As discussed earlier, the fair value estimate of financial instruments for which quoted market prices are unavailable is dependent upon the assumptions used. Consequently, those estimates cannot be substantiated by comparison to independent markets and, in many cases, could not be realized in immediate settlement of the instruments. Accordingly, the aggregate fair value amounts presented in the above fair value table do not necessarily represent their underlying value.

SHAREHOLDERS' EQUITY

SHAREHOLDERS' EQUITY	12 Months Ended
	Dec. 31, 2015
Regulatory Capital Requirements [Abstract]
SHAREHOLDERS' EQUITY	SHAREHOLDERS' EQUITY Cash dividends declared and paid were $1.00 , $0.96 and $0.91 per share for the years ended December 31, 2015 , 2014 and 2013 , respectively. Future dividends will depend on our earnings, financial condition and other factors which the board of directors considers to be relevant. Our dividend policy requires that any cash dividend payments made may not exceed consolidated earnings for that year. We are subject to various regulatory capital requirements administered by the federal banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory and possibly additional discretionary actions by regulators that, if undertaken, could have a direct material effect on our financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, we must meet specific capital guidelines that involve quantitative measures of our assets, liabilities, and certain off-balance-sheet items as calculated under regulatory accounting practices. Our capital amounts and classification are also subject to qualitative judgments by the regulators regarding components, risk weightings, and other factors. Quantitative measures established by regulation to ensure capital adequacy require us to maintain minimum amounts and ratios (set forth in the table below) of Common Equity Tier 1, Tier 1 and Total Capital (as defined in the regulations) to risk-weighted assets (as defined), and of Tier 1 Capital (as defined) to average assets (as defined). At December 31, 2015 , we exceeded all regulatory minimum capital requirements. As of December 31, 2015 , the most recent notification from the FDIC categorized us as well capitalized under the regulatory framework for prompt corrective action. To be categorized as well capitalized we must maintain minimum Common Equity Tier 1 risk-based, Tier 1 risk-based, Total risk-based and Tier 1 leverage ratios as set forth in the table. There are no conditions or events since that notification that management believes have changed our category. Actual For Capital Adequacy Purposes To Be Well Capitalized Under Prompt Corrective Actions Provisions Amount Ratio Amount Ratio Amount Ratio As of December 31, 2015: (dollars in thousands) Common Equity Tier 1 (to Risk Weighted Assets) Consolidated $ 368,865 12.71 % $ 130,549 4.50 % N/A N/A Bank Only $ 416,378 14.36 % $ 130,446 4.50 % $ 188,422 6.50 % Tier 1 Capital (to Risk Weighted Assets) Consolidated $ 422,513 14.56 % $ 174,065 6.00 % N/A N/A Bank Only $ 416,378 14.36 % $ 173,928 6.00 % $ 231,904 8.00 % Total Capital (to Risk Weighted Assets) Consolidated $ 443,106 15.27 % $ 232,087 8.00 % N/A N/A Bank Only $ 436,971 15.07 % $ 231,904 8.00 % $ 289,881 10.00 % Tier 1 Capital (to Average Assets) (1) Consolidated $ 422,513 8.61 % $ 196,347 4.00 % N/A N/A Bank Only $ 416,378 8.49 % $ 196,209 4.00 % $ 245,261 5.00 % As of December 31, 2014: Tier 1 Capital (to Risk Weighted Assets) Consolidated $ 398,798 16.12 % $ 98,932 4.00 % N/A N/A Bank Only $ 384,009 15.55 % $ 98,751 4.00 % $ 148,127 6.00 % Total Capital (to Risk Weighted Assets) Consolidated $ 412,893 16.69 % $ 197,863 8.00 % N/A N/A Bank Only $ 398,104 16.13 % $ 197,503 8.00 % $ 246,878 10.00 % Tier 1 Capital (to Average Assets) (1) Consolidated $ 398,798 11.35 % $ 140,492 4.00 % N/A N/A Bank Only $ 384,009 10.95 % $ 140,329 4.00 % $ 175,412 5.00 % (1) Refers to quarterly average assets as calculated in accordance with policies established by bank regulatory agencies. Our payment of dividends is limited under regulation. The amount that can be paid in any calendar year without prior approval of our regulatory agencies cannot exceed the lesser of net profits (as defined) for that year plus the net profits for the preceding two calendar years, or retained earnings.

DIVIDEND REINVESTMENT AND COMMO

DIVIDEND REINVESTMENT AND COMMON STOCK REPURCHASE PLAN	12 Months Ended
	Dec. 31, 2015
Dividend Reinvestment and Common Stock Repurchase Plan [Abstract]
DIVIDEND REINVESTMENT AND COMMON STOCK REPURCHASE PLAN	DIVIDEND REINVESTMENT AND COMMON STOCK REPURCHASE PLAN We have a Dividend Reinvestment Plan funded by stock authorized but not yet issued. Proceeds from the sale of the common stock will be used for general corporate purposes and could be directed to our subsidiaries. For the year ended December 31, 2015 , 49,908 shares were sold under this plan at an average price of $27.46 per share, reflective of other trades at the time of each sale. For the year ended December 31, 2014 , 40,142 shares were sold under this plan at an average price of $30.23 per share, reflective of other trades at the time of each sale. We have a Common Stock Repurchase Plan. Under the repurchase plan, our board of directors establishes, on a quarterly basis, total dollar limitations and price per share for stock to be repurchased. Our board reviews this plan in conjunction with our capital needs and those of Southside Bank and may, at their discretion, modify or discontinue the plan. During 2013, 90,300 shares of common stock were purchased under this plan at a cost of $1.9 million . There were no additional purchases of shares of common stock under this plan during 2014.

INCOME TAXES

INCOME TAXES	12 Months Ended
	Dec. 31, 2015
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES The income tax expense (benefit) included in the accompanying statements of income consists of the following (in thousands): Years Ended December 31, 2015 2014 2013 Current income tax (benefit) expense $ 10,671 $ (1,239 ) $ 6,041 Deferred income tax (benefit) expense (3,392 ) (925 ) (944 ) Income tax (benefit) expense $ 7,279 $ (2,164 ) $ 5,097 The components of the net deferred tax asset (liability) as of December 31, 2015 and 2014 are summarized below (in thousands): Assets Liabilities Allowance for loan losses $ 6,907 $ Retirement and other benefit plans (2,220 ) Unrealized gains on securities available for sale (1,298 ) Premises and equipment (5,797 ) Core deposit intangible (2,213 ) Fair value adjustment on loans 5,143 Fair value adjustment on time deposits 302 Alternative minimum tax credit 7,465 Unfunded status of defined benefit plan 9,931 State business tax credit 622 Stock-based compensation 841 Other 220 Gross deferred tax assets (liabilities) 31,431 (11,528 ) Net deferred tax asset at December 31, 2015 $ 19,903 Allowance for loan losses $ 4,625 $ Retirement and other benefit plans (3,250 ) Unrealized losses on securities available for sale (5,112 ) Premises and equipment (7,033 ) Core deposit intangible (2,963 ) Fair value adjustment on loans 6,381 Fair value adjustment on time deposits 767 Alternative minimum tax credit 5,613 Unfunded status of defined benefit plan 11,743 State business tax credit 639 Stock-based compensation 494 Other 803 Gross deferred tax assets (liabilities) 31,065 (18,358 ) Net deferred tax asset at December 31, 2014 $ 12,707 A reconciliation of tax at statutory rates and total tax expense is as follows (dollars in thousands): Years Ended December 31, 2015 2014 2013 Amount Percent of Pre-Tax Income Amount Percent of Pre-Tax Income Amount Percent of Pre-Tax Income Statutory tax expense $ 17,946 35.0 % $ 6,348 34.0 % $ 15,738 34.0 % Increase (decrease) in taxes from: Tax exempt interest (9,975 ) (19.5 )% (9,942 ) (53.3 )% (10,298 ) (22.2 )% Bank owned life insurance (914 ) (1.8 )% (451 ) (2.4 )% (1,059 ) (2.3 )% Share based compensation (75 ) (0.1 )% 766 4.1 % — — % Acquisition costs — — % 787 4.2 % — — % State business tax — — % 146 0.8 % 350 0.7 % Other, net 297 0.6 % 182 1.0 % 366 0.8 % Income tax (benefit) expense $ 7,279 14.2 % $ (2,164 ) (11.6 )% $ 5,097 11.0 % We file income tax returns in the U.S. federal jurisdiction and in certain states. We are no longer subject to U.S. federal income tax examinations by tax authorities for years before 2012 . No valuation allowance for deferred tax assets was recorded at December 31, 2015 or 2014 as management believes it is more likely than not that all of the deferred tax assets will be realized in future years. Unrecognized tax benefits were not material at December 31, 2015 or 2014 .

OFF-BALANCE-SHEET ARRANGEMENTS,

OFF-BALANCE-SHEET ARRANGEMENTS, COMMITMENTS AND CONTINGENCIES	12 Months Ended
	Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
OFF-BALANCE-SHEET ARRANGEMENTS, COMMITMENTS AND CONTINGENCIES	OFF-BALANCE-SHEET ARRANGEMENTS, COMMITMENTS AND CONTINGENCIES Financial Instruments with Off-Balance-Sheet Risk . In the normal course of business, we are a party to certain financial instruments with off-balance-sheet risk to meet the financing needs of our customers. These off-balance-sheet instruments include commitments to extend credit and standby letters of credit. These instruments involve, to varying degrees, elements of credit and interest rate risk in excess of the amount reflected in the financial statements. The contract or notional amounts of these instruments reflect the extent of involvement and exposure to credit loss that we have in these particular classes of financial instruments. Commitments to extend credit are agreements to lend to a customer provided that the terms established in the contract are met. Commitments generally have fixed expiration dates and may require the payment of fees. Since some commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. Standby letters of credit are conditional commitments issued to guarantee the performance of a customer to a third party. These guarantees are primarily issued to support public and private borrowing arrangements. The credit risk involved in issuing letters of credit is essentially the same as that involved in extending loan commitments to customers and similarly do not necessarily represent future cash obligations. Financial instruments with off-balance-sheet risk were as follows (in thousands): At At Unused commitments: Commitments to extend credit $ 546,660 $ 373,255 Standby letters of credit 7,752 6,222 Total $ 554,412 $ 379,477 We apply the same credit policies in making commitments and standby letters of credit as we do for on-balance-sheet instruments. We evaluate each customer's creditworthiness on a case-by-case basis. The amount of collateral obtained, if deemed necessary, upon extension of credit is based on management's credit evaluation of the borrower. Collateral held varies but may include cash or cash equivalents, negotiable instruments, real estate, accounts receivable, inventory, oil, gas and mineral interests, property, plant, and equipment. Lease Commitments . We lease certain branch facilities and office equipment under operating leases. Future minimum rental commitments due under non-cancelable operating leases at December 31, 2015 were as follows (in thousands): 2016 $ 1,988 2017 1,523 2018 1,245 2019 861 2020 580 Thereafter 267 $ 6,464 Rent expense for branch facilities was $2.5 million , $1.6 million , and $1.4 million for the years ended December 31, 2015 , 2014 and 2013 , respectively. Rent expense for leased equipment was $297,000 , $235,000 , and $251,000 for the years ended December 31, 2015 , 2014 , and 2013 , respectively. We acquired a 202,000 square-foot office building in Fort Worth, Texas upon completion of the Omni acquisition that is used for a branch location and certain bank operations. We occupy approximately 42,000 square feet of the building and lease the remaining space to various tenants. Gross rental income from these leases of $2.8 million and $116,000 was recognized for the years ended December 31, 2015 and 2014 , respectively. At December 31, 2015 , non-cancelable operating leases for the building with future minimum lease payments are as follows (in thousands): 2016 $ 3,093 2017 2,746 2018 2,023 2019 1,684 2020 1,572 Thereafter 4,002 $ 15,120 It is expected that certain leases will be renewed, or equipment replaced with new leased equipment, as these leases expire. Securities . In the normal course of business we buy and sell securities. There were $19.4 million and $6.0 million of unsettled trades to purchase securities at December 31, 2015 and December 31, 2014 , respectively. There were $9.3 million and $57.2 million unsettled trades to sell securities at December 31, 2015 and December 31, 2014 , respectively. Deposits. There were no unsettled issuances of brokered CDs at December 31, 2015 or December 31, 2014 . Litigation . We are involved with various litigation in the normal course of business. Management, after consulting with our legal counsel, believes that any liability resulting from litigation will not have a material effect on our financial position, results of operations or liquidity.

SIGNIFICANT GROUP CONCENTRATION

SIGNIFICANT GROUP CONCENTRATIONS OF CREDIT RISK	12 Months Ended
	Dec. 31, 2015
Risks and Uncertainties [Abstract]
SIGNIFICANT GROUP CONCENTRATIONS OF CREDIT RISK	SIGNIFICANT GROUP CONCENTRATIONS OF CREDIT RISK Although we have a diversified loan portfolio, a significant portion of our loans are collateralized by real estate. Repayment of these loans is in part dependent upon the economic conditions in the market area. Part of the risk associated with real estate loans has been mitigated since 37.9% of this group represents loans collateralized by residential dwellings that are primarily owner-occupied . Losses on this type of loan have historically been less than those on speculative properties. Many of the remaining real estate loans are collateralized primarily with non owner-occupied commercial real estate. We currently have a concentration of credit risk greater than 10% of loans secured by retail investment real estate properties, such as shopping malls and strip centers. Additionally, the oil and gas industry remains a component of the East Texas economy and as such the health of the oil and gas industry may have an effect on our business. Our oil and gas exposure in the loan portfolio remained minimal at 1.34% of the loan portfolio at December 31, 2015 . The medical community is another significant portion of our loan portfolio. Medical loan types include commercial loans and commercial real estate loans. Collateral for these loans varies depending on the type of loan and financial strength of the borrower. The primary source of repayment for loans in the medical community is cash flow from continuing operations. The medical community represents a concentration of risk in our Commercial loan and Commercial Real Estate loan portfolio. See “Item 1. Business – Market Area.” We believe that risk in the medical community is mitigated because it is spread among multiple practice types and multiple specialties. Should the government change the amount it pays the medical community through the various government health insurance programs or if new government regulation impacts the profitability of the medical community, the medical community could be adversely impacted which in turn could result in higher default rates by borrowers in the medical industry. The MBS we hold consist exclusively of U.S. agency pass-through securities which are either directly or indirectly backed by the full faith and credit of the United States Government or guaranteed by GSEs. The GNMA mortgage-backed securities are backed by the full faith and credit of the United States Government and the Fannie Mae and Freddie Mac U.S. agency GSE guaranteed MBS are not backed by the full faith and credit of the United States government.

PARENT COMPANY FINANCIAL INFORM

PARENT COMPANY FINANCIAL INFORMATION	12 Months Ended
	Dec. 31, 2015
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
PARENT COMPANY FINANCIAL INFORMATION	PARENT COMPANY FINANCIAL INFORMATION Condensed financial information for Southside Bancshares, Inc. (parent company only) was as follows (in thousands, except share amounts): CONDENSED BALANCE SHEETS December 31, 2015 2014 ASSETS Cash and due from banks $ 1,766 $ 11,696 Investment in bank subsidiaries at equity in underlying net assets 494,130 466,374 Investment in nonbank subsidiaries at equity in underlying net assets 1,826 1,826 Other assets 7,282 9,998 TOTAL ASSETS $ 505,004 $ 489,894 LIABILITIES Long-term debt $ 60,311 $ 60,311 Other liabilities 631 4,340 TOTAL LIABILITIES 60,942 64,651 SHAREHOLDERS' EQUITY Common stock ($1.25 par, 40,000,000 shares authorized, 27,865,798 shares issued in 2015 and 26,578,127 shares issued in 2014) 34,832 33,223 Paid-in capital 424,078 389,886 Retained earnings 41,527 55,396 Treasury stock (2,469,638 shares at cost) (37,692 ) (37,692 ) Accumulated other comprehensive loss (18,683 ) (15,570 ) TOTAL SHAREHOLDERS' EQUITY 444,062 425,243 TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY $ 505,004 $ 489,894 CONDENSED STATEMENTS OF INCOME Years Ended December 31, 2015 2014 2013 INCOME (in thousands) Dividends from subsidiary $ 17,600 $ 177,000 $ 15,000 Interest income 44 53 43 TOTAL INCOME 17,644 177,053 15,043 EXPENSE Interest expense 1,455 1,424 1,449 Other 3,193 16,144 2,461 TOTAL EXPENSE 4,648 17,568 3,910 Income before income tax expense 12,996 159,485 11,133 Income tax benefit 1,612 4,043 1,315 Income before equity in undistributed earnings of subsidiaries 14,608 163,528 12,448 Equity in undistributed earnings of subsidiaries 29,389 (142,695 ) 28,742 NET INCOME $ 43,997 $ 20,833 $ 41,190 CONDENSED STATEMENTS OF CASH FLOW Years Ended December 31, 2015 2014 2013 (in thousands) OPERATING ACTIVITIES: Net Income $ 43,997 $ 20,833 $ 41,190 Adjustments to reconcile net income to net cash provided by operations: Equity in undistributed earnings of subsidiaries (29,389 ) 142,695 (28,742 ) Decrease (increase) in other assets 2,716 (6,477 ) 1,032 (Decrease) increase in other liabilities (3,709 ) 3,904 319 Net cash provided by operating activities 13,615 160,955 13,799 INVESTING ACTIVITIES: Investment in subsidiaries (10 ) — — Net cash paid for acquisition — (136,078 ) — Dissolution of subsidiaries — — 1,153 Net cash (used in) provided by investing activities (10 ) (136,078 ) 1,153 FINANCING ACTIVITIES: Purchase of common stock — — (1,899 ) Proceeds from issuance of common stock 1,536 2,287 1,551 Dividends paid (25,071 ) (17,919 ) (16,088 ) Payments for other financing activities — (599 ) — Net cash used in financing activities (23,535 ) (16,231 ) (16,436 ) Net (decrease) increase in cash and cash equivalents (9,930 ) 8,646 (1,484 ) Cash and cash equivalents at beginning of year 11,696 3,050 4,534 Cash and cash equivalents at end of year $ 1,766 $ 11,696 $ 3,050

QUARTERLY FINANCIAL INFORMATION

QUARTERLY FINANCIAL INFORMATION OF REGISTRANT	12 Months Ended
	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
QUARTERLY FINANCIAL INFORMATION OF REGISTRANT NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)	QUARTERLY FINANCIAL INFORMATION OF REGISTRANT NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED) (in thousands, except share amounts) 2015 Fourth Quarter Third Quarter Second Quarter First Quarter Interest income $ 39,964 $ 38,211 $ 37,750 $ 38,607 Interest expense 5,267 4,926 4,845 4,816 Net interest income 34,697 33,285 32,905 33,791 Provision for loan losses 1,951 2,276 268 3,848 Net gain on sale of securities available for sale 204 875 105 2,476 Noninterest income excluding net securities gains 8,611 8,486 8,826 8,312 Noninterest expense 28,431 26,637 28,437 29,449 Income before income tax expense 13,130 13,733 13,131 11,282 Provision for income tax expense 1,438 1,971 1,967 1,903 Net income 11,692 11,762 11,164 9,379 Earnings per common share Basic $ 0.46 $ 0.46 $ 0.44 $ 0.37 Diluted $ 0.46 $ 0.46 $ 0.44 $ 0.37 2014 Fourth Quarter Third Quarter Second Quarter First Quarter Interest income $ 29,613 $ 29,840 $ 32,086 $ 32,239 Interest expense 4,259 4,120 4,230 4,347 Net interest income 25,354 25,720 27,856 27,892 Provision for loan losses 3,287 4,868 2,650 4,133 Net gain on sale of securities available for sale 1,170 1,151 498 11 Noninterest income excluding net securities gains 5,979 3,868 6,017 5,795 Noninterest expense 37,079 20,017 20,426 20,182 (Loss) income before income tax expense (7,863 ) 5,854 11,295 9,383 Provision for income tax (benefit) expense (3,918 ) (243 ) 838 1,159 Net (loss) income (3,945 ) 6,097 10,457 8,224 (Loss) earnings per common share Basic $ (0.19 ) $ 0.31 $ 0.53 $ 0.41 Diluted $ (0.19 ) $ 0.31 $ 0.53 $ 0.41

SUMMARY OF SIGNIFICANT ACCOUN29

SUMMARY OF SIGNIFICANT ACCOUNTING AND REPORTING POLICIES (Policies)	12 Months Ended
	Dec. 31, 2015
Accounting Policies [Abstract]
Basis of Presentation and Consolidation	Basis of Presentation and Consolidation . The consolidated financial statements are prepared in conformity with U.S. generally accepted accounting principles (“GAAP”) and include the accounts of Southside Bancshares, Inc. (the “Company”), and its wholly-owned subsidiaries, Southside Bank (“Southside Bank” or “the Bank”), OmniAmerican Bancorp (“Omni”), SFG Finance, LLC (formerly Southside Financial Group, LLC) which was a wholly-owned subsidiary of the Bank and was dissolved in April 2015, and the nonbank subsidiaries. All significant intercompany accounts and transactions are eliminated in consolidation. On December 17, 2014, we acquired OmniAmerican Bancorp, Inc., a bank holding company traded on the NASDAQ Global Market and the holding company for OmniAmerican Bank, a federal savings association, headquartered in Fort Worth, Texas. See "Note 2 - Acquisition" in the accompanying notes to consolidated financial statements included elsewhere in this report. We determine if we have a controlling financial interest in an entity by first evaluating whether the entity is a voting interest entity or a variable interest entity (“VIE”) under GAAP. Voting interest entities are entities in which the total equity investment at risk is sufficient to enable the entity to finance itself independently and provides the equity holders with the obligation to absorb losses, the right to receive residual returns and the right to make decisions about the entity’s activities. We consolidate voting interest entities in which we have all, or at least a majority of, the voting interest. As defined in applicable accounting standards, VIEs are entities that lack one or more of the characteristics of a voting interest entity. A controlling financial interest in a VIE is present when an enterprise has both the power to direct the activities of the VIE that most significantly impact the VIEs economic performance and an obligation to absorb losses or the right to receive benefits that could potentially be significant to the VIE. The enterprise with a controlling financial interest, known as the primary beneficiary, consolidates the VIE.
Use of Estimates	Use of Estimates . In preparing consolidated financial statements in conformity with GAAP, management is required to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the balance sheet and reported amounts of revenues and expenses during the reporting period. These estimates are subjective in nature and involve matters of judgment. Actual results could differ from these estimates. Material estimates that are particularly susceptible to significant change in the near term relate to the determination of the allowance for loan losses, assumptions used in the defined benefit plan and the fair values of financial instruments. The status of contingencies are particularly subject to change and significant assumptions used in periodic evaluation of securities for other-than-temporary impairment. Certain prior-period amounts have been reclassified to conform to the current period presentation.
Segment Information	Segment Information . Operating segments are components of a business about which separate financial information is available and that are evaluated regularly by the chief operating decision-maker in deciding how to allocate resources and assess performance. Our chief operating decision-maker uses consolidated results to make operating and strategic decisions.
Business Combinations	Business Combinations. Business combinations are accounted for using the acquisition method of accounting. Under this accounting method, the acquired company's net assets are recorded at fair value on the date of acquisition, and the results of operations of the acquired company are combined with our results from that date forward. Costs related to the acquisition are expensed as incurred. The difference between the purchase price and the fair value of the net assets acquired (including intangible assets with finite lives) is recorded as goodwill. The accounting policy for goodwill and intangible assets is summarized in this note under the heading “Goodwill and Other Intangibles.” Acquired loans (non-impaired and impaired) are initially measured at fair value as of the acquisition date. The fair value estimates for acquired loans are based on the estimate of expected cash flows, both principal and interest and prepayments, discounted at prevailing market interest rates. Credit discounts representing the principal losses expected over the life of the loan are also a component of the initial fair value; therefore, an allowance for loan losses is not recorded at the acquisition date. We evaluate acquired loans for impairment in accordance with the provisions of ASC 310-30, “Loans and Debt Securities Acquired with Deteriorated Credit Quality” (“ASC 310-30”). Acquired loans are considered impaired if there is evidence of credit deterioration since origination and if it is probable at time of acquisition that all contractually required payments will not be collected. Expected cash flows at the acquisition date in excess of the fair value of the loans is referred to as the accretable yield and recorded as interest income over the life of the loans. Acquired impaired loans are not classified as nonaccrual or nonperforming as they are considered to be performing under the provisions of ASC 310-30. Subsequent to the acquisition date, increases in expected cash flows will generally result in a recovery of any previously recorded allowance for loan loss, to the extent applicable, and/or a reclassification from the nonaccretable difference to accretable yield, which will be recognized prospectively. The present value of any decreases in expected cash flows after the acquisition date will generally result in an impairment charge recorded as a provision for loan losses, resulting in an increase to the allowance for loan loss. For acquired non-impaired loans, the difference between the acquisition date fair value and the contractual amounts due at the acquisition date represents the fair value adjustment. Fair value adjustments may be discounts (or premiums) to a loan's cost basis and are accreted (or amortized) to interest income over the loan's remaining contractual life using the level yield method.
Cash Equivalents	Cash Equivalents . Cash equivalents, for purposes of reporting cash flow, include cash, amounts due from banks and federal funds sold that have an initial maturity of less than 90 days. We maintain deposits with other 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 we are not exposed to any significant credit risks on cash and cash equivalents.
Basic and Diluted Earnings per Common Share	Basic and Diluted Earnings per Common Share . Basic earnings per common share is based on net income divided by the weighted-average number of common shares outstanding during the period. Diluted earnings per common share include the dilutive effect of stock options granted using the treasury stock method.
Comprehensive Income	Comprehensive Income . Comprehensive income includes all changes in shareholders’ equity during a period, except those resulting from transactions with shareholders. Besides net income, other components of comprehensive income include the after tax effect of changes in the fair value of securities available for sale, changes in the funded status of defined benefit retirement plans and the noncredit portion of other-than-temporary impairment.
Loans	Loans . All loans are stated at principal outstanding net of unearned discount and other deferred expenses or fees. Interest income on loans is recognized using the level yield method or simple interest method. Loans receivable that management has the intent and ability to hold for the foreseeable future or until maturity or pay-off are reported at their outstanding principal adjusted for any charge-offs, the allowance for loan losses, and any unamortized deferred fees or costs on originated loans and unamortized premiums or discounts on purchased loans. A loan is considered impaired, based on current information and events, if it is probable that we will be unable to collect the scheduled payments of principal or interest when due according to the contractual terms of the loan agreement. Substantially all of our impaired loans are collateral-dependent, and as such, are measured for impairment based on the fair value of the collateral.
Loans Held For Sale	Loans Held For Sale . Loans originated and intended for sale in the secondary market are carried at the lower of aggregate cost or fair value, as determined by aggregate outstanding commitments from investors or current investor yield requirements. Net unrealized losses are recognized through a valuation allowance by charges to income. Gains or losses on sales of mortgage loans are recognized based on the difference between the selling price and the carrying value of the related mortgage loans sold.
Loan Fees	Loan Fees . We treat loan fees, net of direct costs, as an adjustment to the yield of the related loan over its term.
Allowance for Loan Losses	Allowance for Loan Losses . An allowance for loan losses is provided through charges to income in the form of a provision for loan losses. Loans which management believes are uncollectible are charged against this account with subsequent recoveries, if any, credited to the account. The amount of the allowance for loan losses is determined by management's evaluation of the quality and inherent risks in the loan portfolio, economic conditions and other factors which warrant current recognition.
Nonaccrual Loans	Nonaccrual Loans . A loan is placed on nonaccrual when principal or interest is contractually past due 90 days or more unless, in the determination of management, the principal and interest on the loan are well collateralized and in the process of collection. In addition, a loan is placed on nonaccrual when, in the opinion of management, the future collectability of interest and principal is not expected. When classified as nonaccrual, accrued interest receivable on the loan is reversed and the future accrual of interest is suspended. Payments of contractual interest are recognized as income only to the extent that full recovery of the principal balance of the loan is reasonably certain.
Other Real Estate Owned	Other Real Estate Owned and Foreclosed Assets . Other Real Estate Owned (“OREO”) includes real estate acquired in full or partial settlement of loan obligations. OREO is initially carried at the fair value of the collateral net of estimated selling costs. Prior to foreclosure, the recorded amount of the loan is written down, if necessary, to the appraised fair value of the real estate to be acquired, less selling costs, by charging the allowance for loan losses. Any subsequent reduction in fair value net of estimated selling costs is charged to noninterest expense. Costs of maintaining and operating foreclosed properties are expensed as incurred and included in other expense in our income statement. Expenditures to complete or improve foreclosed properties are capitalized only if expected to be recovered; otherwise, they are expensed.
Foreclosed Assets	Other foreclosed assets are held for sale and are initially recorded at fair value less estimated selling costs at the date of foreclosure, by charging the allowance for loan losses. Subsequent to foreclosure, valuations are periodically performed by management and the assets are carried at the lower of carrying amount or fair value less costs to sell. Foreclosed assets are included in other assets in the accompanying consolidated balance sheets. Expenses from operations and changes in the valuation allowance are included in noninterest expense.
Securities	Securities . We use the specific identification method to determine the basis for computing realized gain or loss. We account for debt and equity securities as follows: Held to Maturity (“HTM”). Debt securities that management has the positive intent and ability to hold until maturity are classified as HTM and are carried at their remaining unpaid principal balance, net of unamortized premiums or unaccreted discounts. Available for Sale (“AFS”). Debt and equity securities that will be held for indefinite periods of time, including securities that may be sold in response to changes in market interest or prepayment rates, needs for liquidity and changes in the availability of and the yield of alternative investments are classified as AFS. These assets are carried at fair value with changes recorded in other comprehensive income. Fair value is determined using quoted market prices as of the close of business on the balance sheet date. If quoted market prices are not available, fair values are based on quoted market prices for similar securities or estimates from independent pricing services. Unrealized gains and losses on AFS securities are excluded from earnings and reported net of tax in Accumulated Other Comprehensive Income until realized. Declines in the fair value of securities below their cost are reflected in earnings as realized losses to the extent the impairment is deemed to be other-than-temporary credit losses. The amount of the impairment related to other factors is recognized in other comprehensive income unless there is no ability or intent to hold to recovery. Premiums are amortized and discounts are accreted to maturity, or in the case of mortgage-backed securities (“MBS”), over the estimated life of the security, using the level yield interest method. Declines in the fair value of HTM and AFS securities below their cost that are deemed to be other-than-temporary are reflected in earnings as realized losses. In estimating other-than-temporary impairment losses, we consider (1) the length of time and the extent to which the fair value has been less than cost, (2) the financial condition and near-term prospects of the issuer, and (3) our intent and ability to retain our investment in the issuer for a period of time sufficient to allow for any anticipated recovery in fair value. Gains and losses on the sale of securities are recorded in the month of the trade date and are determined using the specific identification method.
Securities with Limited Marketability	Securities with Limited Marketability. Securities with limited marketability, such as stock in the FHLB, are carried at cost and assessed for other-than-temporary impairment.
Fair Value Option	Fair Value Option . We elect the fair value option for MBS purchased at a significant premium.
Premises and Equipment	Premises and Equipment . Land is carried at cost. Bank premises and equipment are stated at cost, net of accumulated depreciation. Depreciation is computed on a straight line basis over the estimated useful lives of the related assets. Useful lives are estimated to be 15 to 40 years for premises and 3 to 10 years for equipment. Leasehold improvements are generally depreciated over the lesser of the term of the respective leases or the estimated useful lives of the improvements. Maintenance and repairs are charged to expense as incurred while major improvements and replacements are capitalized.
Bank Owned Life Insurance	Bank-Owned Life Insurance . The Company has purchased life insurance policies on certain key executives. 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. Changes in the net cash surrender value of the policies, as well as insurance proceeds received are reflected in non-interest income on the consolidated statements of income and are not subject to income taxes.
Goodwill and Other Intangibles	Goodwill and Other Intangibles . Other intangible assets consist primarily of core deposits. Intangible assets with definite useful lives are amortized on an accelerated basis over their estimated life. Goodwill and intangible assets that have indefinite useful lives are subject to at least an annual impairment test and more frequently if a triggering event occurs. If any such impairment is determined, a write-down is recorded.
Repurchase Agreements	Repurchase Agreements . We sell certain securities under agreements to repurchase. The agreements are treated as collateralized financing transactions and the obligations to repurchase securities sold are reflected as a liability in the accompanying consolidated balance sheets. The dollar amount of the securities underlying the agreements remains in the asset account. We determine the type of securities to pledge. Generally we pledge U.S. agency MBS.
Revenue Recognition	Revenue Recognition. The following summarizes our revenue recognition policies as they relate to certain noninterest income line items in the consolidated statements of income. Service charges on deposit accounts include fees for banking services provided, overdrafts and non-sufficient funds. Revenue is generally recognized in accordance with published deposit account agreements for retail accounts or contractual agreements for commercial accounts. Trust income includes fees and commissions from investment management, administrative and advisory services primarily for individuals, and to a lesser extent, partnerships and corporations. Revenue is recognized on an accrual basis at the time the services are performed and are based on either the market value of the assets managed or the services provided.
Advertising Costs	Advertising Costs . Advertising costs are expensed as incurred
Income Taxes	Income Taxes . We file a consolidated federal income tax return. Income tax expense represents the taxes expected to be paid or returned for current year taxes adjusted for the change in deferred tax assets and liabilities. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of changes in tax rates is recognized in income in the period the change occurs.
FHLB Advance Option Fees	FHLB Advance Option Fees . Option fees paid to the FHLB giving us the option to enter into long-term advance commitments at specified interest rates in the future are capitalized and reviewed for impairment. Once the option is exercised, the FHLB advance option fee is amortized over the term of the advance as interest expense.
Fair Value of Financial Instruments	Fair Value of Financial Instruments . Fair values of financial instruments are estimated using relevant market information and other assumptions. Fair value estimates involve uncertainties and matters of significant judgment. In cases where quoted market prices are not available, fair values are based on estimates using present value or other estimation techniques. Those techniques are significantly affected by the assumptions used, including the discount rate and estimates of future cash flows.
Defined Benefit Pension Plan	Defined Benefit Pension Plan . Defined benefit pension plan costs are charged to retirement expense and included in “salaries and employee benefits” on the consolidated statements of income. Defined benefit pension obligations and the annual pension costs are determined by independent actuaries and through the use of a number of assumptions that are reviewed by management. These assumptions include a compensation rate increase, a discount rate used to determine the current benefit obligation and a long-term expected rate of return on plan assets. Net periodic defined benefit pension expense includes service cost, interest cost based on the assumed discount rate, an expected return on plan assets, amortization of prior service cost and amortization of net actuarial gains or losses. Prior service costs include the impact of plan amendments on the liabilities and are amortized over the future service periods of active employees expected to receive benefits under the plan. Actuarial gains and losses result from experience different from that assumed and from changes in assumptions. Amortization of actuarial gains and losses is included as a component of net periodic defined benefit pension cost.
Share-Based Awards	Share-Based Awards . Share-based compensation transactions are recognized as compensation cost in the income statement based on their fair values on the date of the grant and recorded over the vesting period.
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.
Trust Assets	Trust Assets . Assets of our trust department, other than cash on deposit at Southside Bank, are not included in the accompanying financial statements because they are not our assets.
Subsequent Events	Subsequent Events . On January 28, 2016 , the Board of Directors approved a Stock Repurchase Plan . The Board authorized the repurchase, from time to time, of up to 5% of the issued and outstanding common stock, or approximately 1.27 million shares, in open market purchases and privately negotiated transactions at prevailing market prices. The Company has no obligation to repurchase any shares under the Stock Repurchase Plan and may suspend or discontinue it at any time. Subsequent to December 31, 2015 and through March 2, 2016, we purchased 424,701 shares of common stock at an average price of $22.89
Accounting Pronouncements	Accounting Pronouncements : In May 2014, the FASB issued ASU 2014-09, “Revenue from Contracts with Customers (Topic 606).” This update 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 update 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, FASB issued ASU 2015-14, “Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date,” which effectively delayed the adoption date by one year. We are required to adopt ASU 2014-09 in the first quarter of fiscal 2018 and early adoption is permitted. The guidance permits companies to either apply the requirements retrospectively to all prior periods presented, or apply the requirements in the year of adoption, through cumulative adjustment. We have not yet selected a transition method nor have we determined the impact of adoption on our consolidated financial statements. In April 2015, the FASB issued ASU 2015-05, “Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40) – Customer’s Accounting for Fees Paid in a Cloud Computing Arrangement.” ASU 2015-05 affects the accounting for fees paid by a customer in cloud computing arrangements such as (i) software as a service, (ii) platform as a service (iii) infrastructure as a service and (iv) other similar hosting arrangements. If a cloud computing arrangement includes a software license, then the customer should account for the software license element of the arrangement consistent with the acquisition of other software licenses. If a cloud computing arrangement does not include a software license, the customer should account for the arrangement as a service contract. ASU 2015-05 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. Early adoption is permitted. The adoption of this guidance is not expected to have a significant impact on our consolidated financial statements. In May 2015, the FASB issued ASU 2015-07, “Disclosures for Investments in Certain Entities that Calculate Net Asset Value per Share.” ASU 2015-07 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. ASU 2015-07 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. Early adoption is permitted. The adoption of this guidance is not expected to have a significant impact on our consolidated financial statements. In September 2015, the FASB issued ASU 2015-16, “Business Combinations (Topic 805) – Simplifying the Accounting for Measurement-Period Adjustments.” ASU 2015-16 eliminates the requirement for an acquirer in a business combination to account for measurement-period adjustments retrospectively. Instead, acquirers must recognize measurement-period adjustments during the period in which the amounts are determined, including the effect on earnings of any amounts that would have been recorded in previous periods if the accounting had been completed at the acquisition date. ASU 2015-16 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. Early adoption is permitted. We adopted this guidance early for the year ended December 31, 2015. See “Note 2 – Acquisition” for details regarding measurement-period adjustments and the effect on our consolidated financial statements. In January 2016, the FASB issued ASU 2016-1, “Financial Instruments – Overall (Subtopic 825-10) – Recognition and Measurement of Financial Assets and Financial Liabilities." ASU 2016-01, among other things, (i) requires equity investments, with certain exceptions, to be measured at fair value with changes in fair value recognized in net income, (ii) simplifies the impairment assessment of equity investments without readily determinable fair values by requiring a qualitative assessment to identify impairment, (iii) eliminates the requirement for public business entities to disclose the methods and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet, (iv) requires public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes, (v) requires an entity to present separately in other comprehensive income the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option for financial instruments, (vi) requires separate presentation of financial assets and financial liabilities by measurement category and form of financial asset on the balance sheet or the accompanying notes to the financial statements and (vii) clarifies that an entity should evaluate the need for a valuation allowance on a deferred tax asset related to available-for-sale securities in combination with the entity's other deferred tax assets. ASU 2016-01 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2017. Early adoption is permitted. The adoption of this guidance is not expected to have a significant impact on our consolidated financial statements.

ACQUISITION (Tables)

ACQUISITION (Tables)	12 Months Ended
	Dec. 31, 2015
Business Combinations [Abstract]
Schedule of Consideration Paid	The components of the consideration paid are shown in the following table (in thousands). Fair value of consideration transferred: Common stock issued $ 151,891 Cash 157,408 Less: Post-combination share-based compensation expense (1) 8,874 Reimbursement of contract cancellation fees 1,815 Non-compete agreements 300 Total consideration transferred $ 298,310 (1) In connection with the merger, we recorded the unvested stock options and the non-vested restricted stock awards as a post-combination expense.
Schedule of Assets Acquired and Liabilities Assumed	stimated fair values of the assets acquired and liabilities assumed as of the closing date of the transaction adjusted for the subsequent measurement period adjustments are shown in the following table (in thousands). As Originally Reported (1) Measurement Period Adjustments Adjusted Balances Cash, cash equivalents, and amounts due from banks $ 21,214 $ — $ 21,214 Other investments 15,698 1,345 17,043 Securities available for sale 428,447 — 428,447 Loans held for sale 748 — 748 Loans 763,327 159 763,486 Property and equipment 58,928 — 58,928 Bank owned life insurance 44,964 — 44,964 Other assets 13,409 (970 ) 12,439 Core deposit intangible 8,570 — 8,570 Goodwill 69,338 148 69,486 Deposits (801,327 ) — (801,327 ) Short-term borrowings (7,000 ) — (7,000 ) Federal Home Loan Bank advances (308,516 ) — (308,516 ) Deferred tax liability, net (3,244 ) (682 ) (3,926 ) Other liabilities (6,246 ) — (6,246 ) $ 298,310 $ — $ 298,310 (1) The estimated fair value as of the acquisition date, December 17, 2014, as previously reported in our Form 10-K for the year ended December 31, 2014.
Schedule of Goodwill	The following table reflects the changes in the carrying amount of our goodwill for the year ended December 31, 2015 (in thousands): Goodwill Balance as of December 31, 2014 $ 91,372 Plus: measurement period adjustments 148 Balance as of December 31, 2015 $ 91,520
Schedule of Acquired PCI Loans	The table below details the PCI loan portfolio at acquisition date (in thousands): Purchased Credit Impaired Loans at Acquisition Date Contractually required principal and interest payments $ 46,647 Nonaccretable difference 23,262 Cash flows expected to be collected 23,385 Accretable difference 1,898 Fair value of loans acquired with a deterioration of credit quality $ 21,487 The following table presents the outstanding principal balance and carrying value for PCI loans for the periods presented (in thousands): December 31, 2015 December 31, 2014 Outstanding principal balance $ 27,644 $ 32,572 Carrying amount $ 18,620 $ 21,346
Schedule of Acquired Loans that were Considered Performing	Acquired loans that were considered performing at acquisition date and therefore not subject to ASC 310-30 are shown below (in thousands): Fair Value at Acquisition Date Contractual Amounts Receivable Cash Flows Not Expected to be Collected at Acquisition Date (1) Real Estate Loans: Construction $ 49,625 $ 56,877 $ 3,947 1-4 Family Residential 282,577 608,986 248,669 Commercial 152,087 190,920 15,692 Commercial Loans 59,007 72,583 8,602 Loans to Individuals 199,292 261,280 34,689 Total Loans $ 742,588 $ 1,190,646 $ 311,599 (1) Cash flows not expected to be collected relate to estimated credit losses and expected prepayments.

EARNINGS PER SHARE (Tables)

EARNINGS PER SHARE (Tables)	12 Months Ended
	Dec. 31, 2015
Earnings Per Share [Abstract]
Earnings per share on a basic and diluted basis	Earnings per share on a basic and diluted basis has been adjusted to give retroactive recognition to stock dividends and is calculated as follows (in thousands, except per share amounts): Years Ended December 31, 2015 2014 2013 Basic and Diluted Earnings: Net Income $ 43,997 $ 20,833 $ 41,190 Basic weighted-average shares outstanding: 25,350 20,028 19,709 Add: Stock options 85 99 42 Diluted weighted-average shares outstanding 25,435 20,127 19,751 Basic Earnings Per Share: Net Income $ 1.74 $ 1.04 $ 2.09 Diluted Earnings Per Share: Net Income $ 1.73 $ 1.04 $ 2.09

ACCUMULATED OTHER COMPREHENSI32

ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME (Tables)	12 Months Ended
	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Schedule of accumulated other comprehensive income (loss) by component	The changes in accumulated other comprehensive (loss) income by component are as follows (in thousands): Year Ended December 31, 2015 Unrealized Gains (Losses) on Securities Pension Plans Other OTTI Net Prior Net Gain (Loss) Total Beginning balance, net of tax $ 6,238 $ — $ 7 $ (21,815 ) $ (15,570 ) Other comprehensive (loss) income: Other comprehensive (loss) income before reclassifications (6,305 ) — (62 ) 2,806 (3,561 ) Reclassified from accumulated other comprehensive income (3,660 ) — (16 ) 2,448 (1,228 ) Income tax benefit (expense) 3,488 — 27 (1,839 ) 1,676 Net current-period other comprehensive (loss) income, net of tax (6,477 ) — (51 ) 3,415 (3,113 ) Ending balance, net of tax $ (239 ) $ — $ (44 ) $ (18,400 ) $ (18,683 ) Year Ended December 31, 2014 Unrealized Gains (Losses) on Securities Pension Plans Other OTTI Net Prior Net Gain (Loss) Total Beginning balance, net of tax $ (8,656 ) $ — $ (12 ) $ (12,369 ) $ (21,037 ) Other comprehensive income (loss): Other comprehensive income (loss) before reclassifications 25,743 — 43 (15,574 ) 10,212 Reclassified from accumulated other comprehensive income (2,830 ) — (14 ) 1,042 (1,802 ) Income tax (expense) benefit (8,019 ) — (10 ) 5,086 (2,943 ) Net current-period other comprehensive income (loss), net of tax 14,894 — 19 (9,446 ) 5,467 Ending balance, net of tax $ 6,238 $ — $ 7 $ (21,815 ) $ (15,570 ) Year Ended December 31, 2013 Unrealized Gains (Losses) on Securities Pension Plans Other OTTI Net Prior Net Gain (Loss) Total Beginning balance, net of tax $ 30,500 $ (1,140 ) $ 248 $ (26,670 ) $ 2,938 Other comprehensive (loss) income: Other comprehensive (loss) income before reclassifications (50,810 ) 753 (357 ) 19,215 (31,199 ) Reclassified from accumulated other comprehensive income (9,431 ) 1,001 (43 ) 2,787 (5,686 ) Income tax benefit (expense) 21,085 (614 ) 140 (7,701 ) 12,910 Net current-period other comprehensive (loss) income, net of tax (39,156 ) 1,140 (260 ) 14,301 (23,975 ) Ending balance, net of tax $ (8,656 ) $ — $ (12 ) $ (12,369 ) $ (21,037 )
Reclassification out of Accumulated Other Comprehensive Income	The reclassifications out of accumulated other comprehensive (loss) income into net income are presented below (in thousands): Year ended December 31, 2015 2014 2013 Unrealized gains and losses on available for sale securities: Realized gain on sale of securities (1) $ 3,660 $ 2,830 $ 8,472 Impairment losses (2) — — (42 ) Total before tax 3,660 2,830 8,430 Tax expense (1,281 ) (991 ) (2,951 ) Net of tax $ 2,379 $ 1,839 $ 5,479 Amortization of pension plan: Net loss (3) $ (2,448 ) $ (1,042 ) $ (2,787 ) Prior service credit (3) 16 14 43 Total before tax (2,432 ) (1,028 ) (2,744 ) Tax benefit 851 359 960 Net of tax $ (1,581 ) $ (669 ) $ (1,784 ) Total reclassifications for the period, net of tax $ 798 $ 1,170 $ 3,695 (1) Listed as net gain on sale of securities available for sale on the consolidated statements of income. (2) Included in other in noninterest income on the consolidated statements of income. (3) These accumulated other comprehensive income components are included in the computation of net periodic pension cost presented in “Note 11 - Employee Benefits.”

SECURITIES (Tables)

SECURITIES (Tables)	12 Months Ended
	Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Amortized cost and estimated fair value of investment and mortgage-backed securities	The amortized cost, gross unrealized gains and losses, carrying value, and estimated fair value of investment and mortgage-backed securities as of December 31, 2015 and 2014 , are reflected in the tables below (in thousands): December 31, 2015 Recognized in OCI Not recognized in OCI Amortized Gross Unrealized Gross Unrealized Carrying Gross Gross Unrealized Estimated AVAILABLE FOR SALE Cost Gains Losses Value Gains Losses Fair Value Investment Securities: U.S. Treasury $ 103,906 $ 61 $ 380 $ 103,587 $ — $ — $ 103,587 State and Political Subdivisions 236,534 8,323 611 244,246 — — 244,246 Other Stocks and Bonds 12,772 63 45 12,790 — — 12,790 Other Equity Securities 6,052 — 36 6,016 — — 6,016 Mortgage-backed Securities: (1) Residential 580,621 9,120 1,239 588,502 — — 588,502 Commercial 512,116 466 7,231 505,351 — — 505,351 Total $ 1,452,001 $ 18,033 $ 9,542 $ 1,460,492 $ — $ — $ 1,460,492 HELD TO MATURITY Investment Securities: State and Political Subdivisions $ 389,997 $ 4,772 $ 9,273 $ 385,496 $ 13,061 $ 1,363 $ 397,194 Mortgage-backed Securities: (1) Residential 31,430 — 51 31,379 2,018 1 33,396 Commercial 371,727 1,233 5,539 367,421 4,232 2,480 369,173 Total $ 793,154 $ 6,005 $ 14,863 $ 784,296 $ 19,311 $ 3,844 $ 799,763 December 31, 2014 Recognized in OCI Not recognized in OCI Amortized Gross Unrealized Gross Unrealized Carrying Gross Gross Unrealized Estimated AVAILABLE FOR SALE Cost Gains Losses Value Gains Losses Fair Value Investment Securities: U.S. Treasury $ 14,883 $ 30 $ 7 $ 14,906 $ — $ — $ 14,906 U.S. Government Agency Debentures 4,835 — 7 4,828 — — 4,828 State and Political Subdivisions 260,535 8,055 906 267,684 — — 267,684 Other Stocks and Bonds 13,086 153 — 13,239 — — 13,239 Other Equity Securities 6,061 — 12 6,049 — — 6,049 Mortgage-backed Securities: (1) Residential 952,481 12,624 807 964,298 — — 964,298 Commercial 176,112 1,743 151 177,704 — — 177,704 Total $ 1,427,993 $ 22,605 $ 1,890 $ 1,448,708 $ — $ — $ 1,448,708 HELD TO MATURITY Investment Securities: State and Political Subdivisions $ 393,525 $ 5,168 $ 9,870 $ 388,823 $ 12,181 $ 756 $ 400,248 Mortgage-backed Securities: (1) Residential 52,287 — 70 52,217 2,871 — 55,088 Commercial 207,624 — 6,345 201,279 5,461 489 206,251 Total $ 653,436 $ 5,168 $ 16,285 $ 642,319 $ 20,513 $ 1,245 $ 661,587 (1) All mortgage-backed securities issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.
Unrealized Loss on Securities	The following table represents the unrealized loss on securities for the years ended December 31, 2015 and 2014 (in thousands): Less Than 12 Months More Than 12 Months Total Fair Value Unrealized Loss Fair Value Unrealized Loss Fair Value Unrealized Loss As of December 31, 2015: AVAILABLE FOR SALE Investment Securities: U.S. Treasury $ 64,172 $ 380 $ — $ — $ 64,172 $ 380 State and Political Subdivisions 15,550 116 19,270 495 34,820 611 Other Stocks and Bonds 2,954 45 — — 2,954 45 Other Equity Securities 6,016 36 — — 6,016 36 Mortgage-backed Securities: Residential 229,514 1,215 3,817 24 233,331 1,239 Commercial 422,316 7,039 5,110 192 427,426 7,231 Total $ 740,522 $ 8,831 $ 28,197 $ 711 $ 768,719 $ 9,542 HELD TO MATURITY Investment Securities: State and Political Subdivisions $ 24,340 $ 214 $ 62,240 $ 1,149 $ 86,580 $ 1,363 Mortgage-backed Securities: Residential 1,717 1 — — 1,717 1 Commercial 193,710 2,439 2,481 41 196,191 2,480 Total $ 219,767 $ 2,654 $ 64,721 $ 1,190 $ 284,488 $ 3,844 As of December 31, 2014: AVAILABLE FOR SALE Investment Securities: U.S. Treasury $ 4,968 $ 7 $ — $ — $ 4,968 $ 7 U.S. Government Agency Debentures 4,828 7 — — 4,828 7 State and Political Subdivisions 28,155 90 44,269 816 72,424 906 Other Equity Securities 6,049 12 — — 6,049 12 Mortgage-backed Securities: Residential 347,777 573 27,632 234 375,409 807 Commercial 21,103 54 10,116 97 31,219 151 Total $ 412,880 $ 743 $ 82,017 $ 1,147 $ 494,897 $ 1,890 HELD TO MATURITY Investment Securities: State and Political Subdivisions $ 7,843 $ 31 $ 64,946 $ 725 $ 72,789 $ 756 Mortgage-backed Securities: Commercial — — 44,144 489 44,144 489 Total $ 7,843 $ 31 $ 109,090 $ 1,214 $ 116,933 $ 1,245
Impairment related to loss recognized in earnings and impairment activity related to all other factors recognized in other comprehensive income	The following table presents a roll forward of the credit losses recognized in earnings on these AFS debt securities held at the end of the year presented (in thousands): Year Ended December 31, 2013 Balance, beginning of period $ 3,256 Additions for credit losses recognized on debt securities that had previously incurred impairment losses 42 Sales of credit impaired securities (3,298 ) Balance, end of period $ —
Interest income recognized on securities	Interest income recognized on securities for the years presented (in thousands): Years Ended December 31, 2015 2014 2013 U.S. Treasury $ 1,132 $ 264 $ 17 U.S. Government Agency Debentures 118 104 440 State and Political Subdivisions 22,474 24,077 25,620 Other Stocks and Bonds 213 208 205 Other Equity Securities 118 — — Mortgage-backed Securities 33,661 28,207 20,085 Total interest income on securities $ 57,716 $ 52,860 $ 46,367
Amortized cost and fair value of securities presented by contractual maturity	The amortized cost, carrying value, and fair value of securities at December 31, 2015 , are presented below by contractual maturity. Expected maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations. MBS are presented in total by category due to the fact that MBS typically are issued with stated principal amounts, and the securities are backed by pools of mortgages that have loans with varying maturities. The characteristics of the underlying pool of mortgages, such as fixed-rate or adjustable-rate, as well as prepayment risk, are passed on to the certificate holder. The term of a mortgage-backed pass-through security thus approximates the term of the underlying mortgages and can vary significantly due to prepayments. December 31, 2015 Amortized Cost Fair Value Available for sale securities: (in thousands) Investment Securities Due in one year or less $ 21,207 $ 21,313 Due after one year through five years 13,438 13,773 Due after five years through ten years 133,958 134,507 Due after ten years 184,609 191,030 353,212 360,623 Mortgage-backed securities and other equity securities 1,098,789 1,099,869 Total $ 1,452,001 $ 1,460,492 December 31, 2015 Carrying Value Fair Value Held to maturity securities: (in thousands) Investment Securities Due in one year or less $ 2,437 $ 2,434 Due after one year through five years 16,196 16,322 Due after five years through ten years 57,508 58,719 Due after ten years 309,355 319,719 385,496 397,194 Mortgage-backed securities 398,800 402,569 Total $ 784,296 $ 799,763

LOANS AND ALLOWANCE FOR PROBA34

LOANS AND ALLOWANCE FOR PROBABLE LOAN LOSSES (Tables)	12 Months Ended
	Dec. 31, 2015
Receivables [Abstract]
Classification of loans in the consolidated balance sheets	Loans in the accompanying consolidated balance sheets are classified as follows (in thousands): December 31, 2015 December 31, 2014 Real Estate Loans: Construction $ 438,247 $ 267,830 1-4 Family Residential 655,410 690,895 Commercial 635,210 468,171 Commercial Loans 242,527 226,460 Municipal Loans 288,115 257,492 Loans to Individuals 172,244 270,285 Total Loans (1) 2,431,753 2,181,133 Less: Allowance for Loan Losses 19,736 13,292 Net Loans $ 2,412,017 $ 2,167,841 (1) Includes approximately $581.1 million and $763.3 million as of December 31, 2015 and 2014 , respectively, of loans acquired with the Omni acquisition on December 17, 2014. These loans were measured at fair value at the acquisition date with no carryover of allowance for loan loss. The allowance for loan loss recorded on acquired loans for the year ended December 31, 2015 totaled $629,000 .
Activity in the allowance for loan losses by portfolio segment	The following tables detail activity in the allowance for loan losses by portfolio segment for the periods presented (in thousands): Year Ended December 31, 2015 Real Estate Construction 1-4 Family Residential Commercial Commercial Loans Municipal Loans Loans to Individuals Total Balance at beginning of period (2) $ 2,456 $ 2,822 $ 3,025 $ 3,279 $ 716 $ 994 $ 13,292 Provision (reversal) for loan losses 1,711 (284 ) 1,467 3,500 258 1,691 8,343 Loans charged off (24 ) (58 ) — (336 ) (249 ) (3,688 ) (4,355 ) Recoveries of loans charged off 207 115 85 153 — 1,896 2,456 Balance at end of period $ 4,350 $ 2,595 $ 4,577 $ 6,596 $ 725 $ 893 $ 19,736 Year Ended December 31, 2014 Real Estate Construction 1-4 Family Residential Commercial Commercial Loans Municipal Loans Loans to Individuals (1) Total Balance at beginning of period $ 2,142 $ 3,277 $ 2,572 $ 1,970 $ 668 $ 8,248 $ 18,877 Provision (reversal) for loan losses 172 (514 ) 445 1,204 48 13,583 14,938 Loans charged off (14 ) (22 ) — (66 ) — (22,461 ) (22,563 ) Recoveries of loans charged off 156 81 8 171 — 1,624 2,040 Balance at end of period (2) $ 2,456 $ 2,822 $ 3,025 $ 3,279 $ 716 $ 994 $ 13,292 (1) Of the $22.5 million in charge-offs recorded in the Loans to Individuals category for the year ended December 31, 2014 , approximately $7.1 million relate to the write-down of SFG loans to fair value in connection with the sale of the subprime automobile loans that was completed in the fourth quarter 2014. (2) Loans acquired with the Omni acquisition were measured at fair value on December 17, 2014 with no carryover of allowance for loan loss. Year Ended December 31, 2013 Real Estate Construction 1-4 Family Residential Commercial Commercial Loans Municipal Loans Loans to Individuals Other Total Balance at beginning of period $ 2,355 $ 3,545 $ 2,290 $ 3,158 $ 633 $ 7,373 $ 1,231 $ 20,585 Provision (reversal) for loan losses (290 ) (40 ) 10 (909 ) 35 10,073 — 8,879 Distribution of other allowance — — — — — 1,231 (1,231 ) — Loans charged off — (319 ) (67 ) (512 ) — (12,676 ) — (13,574 ) Recoveries of loans charged off 77 91 339 233 — 2,247 — 2,987 Balance at end of period $ 2,142 $ 3,277 $ 2,572 $ 1,970 $ 668 $ 8,248 $ — $ 18,877
Balance in the allowance for loan losses by portfolio segment based on impairment method	The following tables present the balance in the allowance for loan losses by portfolio segment based on impairment method (in thousands): As of December 31, 2015 Real Estate Construction 1-4 Family Residential Commercial Commercial Loans Municipal Loans Loans to Individuals Total Ending balance – individually evaluated for impairment (1) $ 12 $ 25 $ 137 $ 4,599 $ 13 $ 105 $ 4,891 Ending balance – collectively evaluated for impairment 4,338 2,570 4,440 1,997 712 788 14,845 Balance at end of period $ 4,350 $ 2,595 $ 4,577 $ 6,596 $ 725 $ 893 $ 19,736 As of December 31, 2014 Real Estate Construction 1-4 Family Residential Commercial Commercial Loans Municipal Loans Loans to Individuals Total Ending balance – individually evaluated for impairment (1) $ 43 $ 102 $ 26 $ 242 $ 14 $ 103 $ 530 Ending balance – collectively evaluated for impairment 2,413 2,720 2,999 3,037 702 891 12,762 Balance at end of period $ 2,456 $ 2,822 $ 3,025 $ 3,279 $ 716 $ 994 $ 13,292 (1) Purchase credit impaired (“PCI”) loans were measured at fair value at acquisition and did not have any associated allowance for loan losses as of December 31, 2014 . As of December 31, 2015 , there was approximately $629,000 of allowance for loan losses associated with PCI loans.
Balance in recorded investments in loans by portfolio segment based on impairment method	The following tables present the recorded investment in loans by portfolio segment based on impairment method (in thousands): December 31, 2015 Real Estate Construction 1-4 Family Residential Commercial Commercial Loans Municipal Loans Individuals Total Loans individually evaluated for impairment $ 508 $ 1,751 $ 3,757 $ 14,250 $ 637 $ 258 $ 21,161 Loans collectively evaluated for impairment 437,518 646,590 628,405 220,199 287,478 171,782 2,391,972 Purchased credit impaired loans 221 7,069 3,048 8,078 — 204 18,620 Total ending loans balance $ 438,247 $ 655,410 $ 635,210 $ 242,527 $ 288,115 $ 172,244 $ 2,431,753 December 31, 2014 Real Estate Construction 1-4 Family Residential Commercial Commercial Loans Municipal Loans Loans to Individuals Total Loans individually evaluated for impairment $ 2,461 $ 2,936 $ 1,605 $ 1,011 $ 699 $ 310 $ 9,022 Loans collectively evaluated for impairment (1) 264,584 680,658 463,564 216,272 256,793 268,894 2,150,765 Purchased credit impaired loans (2) 785 7,301 3,002 9,177 — 1,081 21,346 Total ending loans balance $ 267,830 $ 690,895 $ 468,171 $ 226,460 $ 257,492 $ 270,285 $ 2,181,133 (1) Includes purchased non impaired loans which were measured at fair value at acquisition and did not have an associated allowance for loan loss as of December 31, 2014 . (2) PCI loans were measured at fair value at acquisition and did not have an associated allowance for loan loss as of December 31, 2014 .
Summary of loans by credit quality indicators	The following tables set forth loans by credit quality indicator for the periods presented (in thousands): December 31, 2015 Pass Pass Watch Special Mention (1) Substandard (1) Doubtful (1) Total Real Estate Loans: Construction $ 434,893 $ — $ 1,754 $ 1,576 $ 24 $ 438,247 1-4 Family Residential 643,498 1,403 1,636 4,915 3,958 655,410 Commercial 620,117 — — 14,988 105 635,210 Commercial Loans 204,775 716 1,738 27,681 7,617 242,527 Municipal Loans 286,415 — 1,063 637 — 288,115 Loans to Individuals 170,558 2 — 478 1,206 172,244 Total $ 2,360,256 $ 2,121 $ 6,191 $ 50,275 $ 12,910 $ 2,431,753 (1) Includes PCI loans comprised of $95,000 special mention, $3.6 million substandard, and $9.9 million doubtful as of December 31, 2015 . December 31, 2014 Pass Pass Watch Special Mention (1) Substandard (1) Doubtful Total Real Estate Loans: Construction $ 260,183 $ 862 $ 1,394 $ 5,363 $ 28 $ 267,830 1-4 Family Residential 677,559 1,453 1,706 9,167 1,010 690,895 Commercial 455,394 2,416 2,569 7,792 — 468,171 Commercial Loans 199,306 781 1,044 25,102 227 226,460 Municipal Loans 256,543 — — 949 — 257,492 Loans to Individuals 269,204 16 — 871 194 270,285 Total $ 2,118,189 $ 5,528 $ 6,713 $ 49,244 $ 1,459 $ 2,181,133 (1) Includes PCI loans comprised of $0.7 million special mention and $17.8 million substandard as of December 31, 2014 .
Summary of nonperforming assets for the period	The following table sets forth nonperforming assets for the periods presented (in thousands): At At Nonaccrual loans (1) $ 20,526 $ 4,096 Accruing loans past due more than 90 days (1) 3 4 Restructured loans (2) 11,143 5,874 Other real estate owned 744 1,738 Repossessed assets 64 565 Total Nonperforming Assets $ 32,480 $ 12,277 (1) Excludes PCI loans measured at fair value at acquisition. (2) Includes $7.5 million in PCI loans restructured during the year ended December 31, 2015 .
Recorded investment in nonaccrual by class of loans	The following table sets forth the recorded investment in nonaccrual by class of loans for the periods presented (in thousands): Nonaccrual Loans (1) December 31, 2015 December 31, 2014 Real Estate Loans: Construction $ 508 $ 716 1-4 Family Residential 1,847 2,017 Commercial 2,816 675 Commercial Loans 13,896 416 Loans to Individuals 1,459 272 Total $ 20,526 $ 4,096 (1) Excludes PCI loans measured at fair value at acquisition.
Summary of impaired loans by class of loans for the period	The following tables set forth impaired loans by class of loans for the periods presented (in thousands): December 31, 2015 Unpaid Contractual Principal Balance Recorded Investment With Allowance Related Allowance for Loan Losses Real Estate Loans: Construction $ 1,320 $ 508 $ 12 1-4 Family Residential 1,842 1,751 25 Commercial 4,756 4,636 137 Commercial Loans 29,844 21,385 4,599 Municipal Loans 637 637 13 Loans to Individuals 288 257 105 Total (1) $ 38,687 $ 29,174 $ 4,891 (1) Includes of $8.0 million of PCI loans that experienced deterioration in credit quality subsequent to the acquisition date. December 31, 2014 Unpaid Contractual Principal Balance Recorded Investment With Allowance Related Allowance for Loan Losses Real Estate Loans: Construction $ 3,183 $ 2,461 $ 43 1-4 Family Residential 4,023 3,854 108 Commercial 1,622 1,605 26 Commercial Loans 1,162 1,011 242 Municipal Loans 699 699 14 Loans to Individuals 321 310 103 Total (1) $ 11,010 $ 9,940 $ 536 (1) PCI loans are excluded from this table as there was no evidence of further deterioration in credit quality as of December 31, 2014 that would indicate it was probable that our recorded investment in these loans would not be recoverable.
Aging of recorded investment in past due loans by class of loans	The following tables present the aging of the recorded investment in past due loans by class of loans (in thousands): December 31, 2015 30-59 Days Past Due 60-89 Days Past Due Greater than 90 Days Past Due Total Past Due Current (1) Total Real Estate Loans: Construction $ 121 $ 258 $ 208 $ 587 $ 437,660 $ 438,247 1-4 Family Residential 3,703 781 1,080 5,564 649,846 655,410 Commercial 359 1,289 361 2,009 633,201 635,210 Commercial Loans 527 138 335 1,000 241,527 242,527 Municipal Loans — — — — 288,115 288,115 Loans to Individuals 2,457 608 285 3,350 168,894 172,244 Total $ 7,167 $ 3,074 $ 2,269 $ 12,510 $ 2,419,243 $ 2,431,753 December 31, 2014 30-59 Days Past Due 60-89 Days Past Due Greater than 90 Days Past Due Total Past Due Current (1) Total Real Estate Loans: Construction $ 376 $ 42 $ 716 $ 1,134 $ 266,696 $ 267,830 1-4 Family Residential 3,511 509 2,017 6,037 684,858 690,895 Commercial 1,203 — 675 1,878 466,293 468,171 Commercial Loans 397 3 416 816 225,644 226,460 Municipal Loans — — — — 257,492 257,492 Loans to Individuals 362 66 276 704 269,581 270,285 Total $ 5,849 $ 620 $ 4,100 $ 10,569 $ 2,170,564 $ 2,181,133 (1) Includes PCI loans measured at fair value.
Average recorded investment and interest income on impaired loans	The following table sets forth average recorded investment and interest income recognized on impaired loans by class of loans for the periods presented (in thousands): December 31, 2015 December 31, 2014 December 31, 2013 Average Recorded Investment (1) Interest Income Recognized (1) Average Recorded Investment (1) Interest Income Recognized (1) Average Recorded Investment Interest Income Recognized Real Estate Loans: Construction $ 1,518 $ — $ 1,346 $ 4 $ 1,707 $ — 1-4 Family Residential 3,410 61 3,511 67 2,915 76 Commercial 3,323 64 2,173 52 1,972 72 Commercial Loans 13,807 256 1,286 26 1,935 19 Municipal Loans 824 37 750 41 292 16 Loans to Individuals 725 4 1,920 3 3,149 449 Total $ 23,607 $ 422 $ 10,986 $ 193 $ 11,970 $ 632 (1) Excludes PCI loans measured at fair value at acquisition that have not experienced further deterioration in credit quality subsequent to the acquisition date.
Schedule of Recorded Investment in Loans Modified	The following tables set forth the recorded balance at December 31, 2015 and 2014 of loans considered to be TDRs that were restructured during the periods presented (dollars in thousands): Year Ended December 31, 2015 Extend Amortization Period Interest Rate Reductions Combination (1) Total Modifications Number of Contracts Real Estate Loans: 1-4 Family Residential $ — $ 80 $ 255 $ 335 3 Commercial 438 — 1,290 1,728 4 Commercial Loans 13,249 — 7,507 20,756 12 Loans to Individuals 60 — 130 190 14 Total $ 13,747 $ 80 $ 9,182 $ 23,009 33 Year Ended December 31, 2014 Extend Amortization Period Interest Rate Reductions Combination (1) Total Modifications Number of Contracts Real Estate Loans: Construction $ 1,746 $ — $ — $ 1,746 1 1-4 Family Residential — 280 374 654 3 Commercial 558 — 391 949 3 Commercial Loans 291 — 172 463 6 Loans to Individuals 5 10 68 83 8 Total $ 2,600 $ 290 $ 1,005 $ 3,895 21 (1) These modifications may include an extension of the amortization period, interest rate reduction, and/or converting the loan to interest-only for a limited period of time.
Schedule of Acquired PCI Loans	The table below details the PCI loan portfolio at acquisition date (in thousands): Purchased Credit Impaired Loans at Acquisition Date Contractually required principal and interest payments $ 46,647 Nonaccretable difference 23,262 Cash flows expected to be collected 23,385 Accretable difference 1,898 Fair value of loans acquired with a deterioration of credit quality $ 21,487 The following table presents the outstanding principal balance and carrying value for PCI loans for the periods presented (in thousands): December 31, 2015 December 31, 2014 Outstanding principal balance $ 27,644 $ 32,572 Carrying amount $ 18,620 $ 21,346
Schedule of changes in accretable yield for PCI loans	The following table presents the changes of the accretable yield during the period for PCI loans (in thousands): December 31, 2015 December 31, 2014 Balance at beginning of period $ 1,820 $ — Additions — — Additions due to acquisition — 1,898 Reclassifications from Nonaccretable Discount 2,739 — Accretion (2,066 ) (78 ) Balance at end of period $ 2,493 $ 1,820

PREMISES AND EQUIPMENT (Tables)

PREMISES AND EQUIPMENT (Tables)	12 Months Ended
	Dec. 31, 2015
Property, Plant and Equipment [Abstract]
Schedule of premises and equipment	December 31, 2015 December 31, 2014 (in thousands) Premises $ 124,626 $ 121,740 Furniture and equipment 35,069 36,045 159,695 157,785 Less: accumulated depreciation 51,766 44,925 Total $ 107,929 $ 112,860

DEPOSITS (Tables)

DEPOSITS (Tables)	12 Months Ended
	Dec. 31, 2015
Deposits [Abstract]
Schedule of deposits at year-end	December 31, 2015 December 31, 2014 (in thousands) Noninterest bearing demand deposits: Private accounts $ 651,992 $ 640,450 Public accounts 20,478 20,564 Total noninterest bearing demand deposits 672,470 661,014 Interest bearing deposits: Private accounts: Savings deposits 233,157 226,267 Money market demand deposits 341,432 379,149 Platinum money market deposits 323,526 291,473 Interest bearing checking 177,409 11,863 NOW demand deposits 253,041 409,737 Certificates and other time deposits of $250,000 or more 57,209 60,408 Certificates and other time deposits under $250,000 498,901 493,125 Total private accounts 1,884,675 1,872,022 Public accounts: Savings deposits 15 9 Money market demand deposits 22,518 22,656 Platinum money market deposits 383,716 398,333 Interest bearing checking 6,679 35 NOW demand deposits 151,974 132,909 Certificates and other time deposits of $250,000 or more 311,824 268,302 Certificates and other time deposits under $250,000 21,536 19,137 Total public accounts 898,262 841,381 Total interest bearing deposits 2,782,937 2,713,403 Total deposits $ 3,455,407 $ 3,374,417
Schedule of maturities of time deposits	At December 31, 2015 , the scheduled maturities of certificates and other time deposits, including public accounts, were as follows (in thousands): 2016 $ 501,440 2017 160,560 2018 136,379 2019 47,368 2020 37,875 2021 and thereafter 5,848 $ 889,470

SHORT-TERM BORROWINGS (Tables)

SHORT-TERM BORROWINGS (Tables)	12 Months Ended
	Dec. 31, 2015
Short-term Debt [Abstract]
Schedule of short-term borrowings	Information related to short-term borrowings is provided in the table below: Years Ended December 31, 2015 2014 (dollars in thousands) Federal funds purchased and repurchase agreements Balance at end of period $ 2,429 $ 4,237 Average amount outstanding during the period (1) 2,277 1,886 Maximum amount outstanding during the period (2) 2,429 4,237 Weighted average interest rate during the period (3) 0.1 % 0.2 % Interest rate at end of period 0.1 % 1.4 % FHLB advances Balance at end of period $ 645,407 $ 297,368 Average amount outstanding during the period (1) 382,417 62,240 Maximum amount outstanding during the period (2) 656,431 297,368 Weighted average interest rate during the period (3) 0.3 % 0.9 % Interest rate at end of period 0.5 % 0.4 % (1) The average amount outstanding during the period was computed by dividing the total daily outstanding principal balances by the number of days in the period. (2) The maximum amount outstanding at any month-end during the period. (3) The weighted average interest rate during the period was computed by dividing the actual interest expense by the average balance outstanding during the period.

LONG-TERM OBLIGATIONS (Tables)

LONG-TERM OBLIGATIONS (Tables)	12 Months Ended
	Dec. 31, 2015
Debt Disclosure [Abstract]
Schedule of long-term debt	Years Ended December 31, 2015 2014 (dollars in thousands) FHLB advances Balance at end of period $ 502,281 $ 600,052 Weighted average interest rate during the period (1) 1.3 % 1.4 % Interest rate at end of period 1.3 % 1.3 % Long-term debt (2) Balance at end of period $ 60,311 $ 60,311 Weighted average interest rate during the period (1) 2.4 % 2.4 % Interest rate at end of period 2.6 % 2.3 % (1) The weighted average interest rate during the period was computed by dividing the actual interest expense by the average balance outstanding during the period. (2) This long-term debt consists of trust preferred securities that qualify under the risk-based capital guidelines as Tier 1 capital, subject to certain limitations.
Schedule of maturities of long-term debt	Maturities of fixed rate long-term obligations based on scheduled repayments at December 31, 2015 are as follows (in thousands): Years Ended December 31, 2016 2017 2018 2019 2020 Thereafter Total FHLB advances $ 1,093 $ 288,808 $ 78,288 $ 42,348 $ 76,016 $ 15,728 $ 502,281 Long-term debt — — — — — 60,311 60,311 Total long-term obligations $ 1,093 $ 288,808 $ 78,288 $ 42,348 $ 76,016 $ 76,039 $ 562,592
Schedule of Trust Preferred Securities	Years Ended December 31, 2015 2014 (in thousands) Long-term debt Southside Statutory Trust III Due 2033 (1) $ 20,619 $ 20,619 Southside Statutory Trust IV Due 2037 (2) 23,196 23,196 Southside Statutory Trust V Due 2037 (3) 12,887 12,887 Magnolia Trust Company I Due 2035 (4) 3,609 3,609 Total Long-term Debt $ 60,311 $ 60,311 (1) This debt carries an adjustable rate of 3.5467% through March 30, 2016 and adjusts quarterly at a rate equal to three-month LIBOR plus 294 basis points. (2) This debt carried an adjustable rate of 1.6219% through January 29, 2016 and reset to 1.9156% through April 29, 2016 . This debt adjusts quarterly at a rate equal to three-month LIBOR plus 130 basis points. (3) This debt carries an adjustable rate of 2.762% through March 14, 2016 and adjusts quarterly at a rate equal to three-month LIBOR plus 225 basis points. (4) This debt carried an adjustable rate of 2.1776% through February 22, 2016 and reset to 2.4182% through May 22, 2016 . This debt adjusts quarterly at a rate equal to three-month LIBOR plus 180 basis points.

EMPLOYEE BENEFITS (Tables)

EMPLOYEE BENEFITS (Tables)	12 Months Ended
	Dec. 31, 2015
Employee Benefits Including Defined Benefit Plans and Share-based Compensation Plans [Abstract]
Schedule of changes in projected benefit obligation and fair value of plan assets	2015 2014 2013 Defined Benefit Pension Plan Defined Restoration Plan Defined Benefit Pension Plan Defined Restoration Plan Defined Benefit Pension Plan Restoration Plan (in thousands) Change in Projected Benefit Obligation: Benefit obligation at end of prior year $ 84,050 $ 5,977 $ 13,259 $ 70,046 $ — $ 10,848 $ 78,002 $ 9,801 Service cost 1,838 — 334 1,697 — 275 2,118 298 Interest cost 3,410 238 668 3,497 — 563 3,155 468 Actuarial (gain) loss (6,777 ) (753 ) (1,968 ) 13,146 — 1,813 (11,642 ) 344 Benefits paid (2,590 ) (28 ) (269 ) (4,118 ) — (240 ) (1,776 ) (120 ) Expenses paid (67 ) (30 ) — (175 ) — — (111 ) — Plan acquired through acquisition (1) — — — — 5,977 — — — Plan amendments — — — (43 ) — — 300 57 Settlements — (719 ) — — — — — — Special and contractual termination benefits 176 — — — — — — — Benefit obligation at end of year 80,040 4,685 12,024 84,050 5,977 13,259 70,046 10,848 Change in Plan Assets: Fair value of plan assets at end of prior year 79,730 4,512 — 78,990 — — 63,165 — Actual return (718 ) 5 — 5,033 — — 12,712 — Employer contributions — — 269 — — 240 5,000 120 Benefits paid (2,590 ) (28 ) (269 ) (4,118 ) — (240 ) (1,776 ) (120 ) Expenses paid (67 ) (30 ) — (175 ) — — (111 ) — Settlements — (719 ) — — — — — — Plan acquired through acquisition (1) — — — — 4,512 — — — Fair value of plan assets at end of year 76,355 3,740 — 79,730 4,512 — 78,990 — (Un)Funded status at end of year (3,685 ) (945 ) (12,024 ) (4,320 ) (1,465 ) (13,259 ) 8,944 (10,848 ) Accrued benefit (liability) asset recognized $ (3,685 ) $ (945 ) $ (12,024 ) $ (4,320 ) $ (1,465 ) $ (13,259 ) $ 8,944 $ (10,848 ) Accumulated benefit obligation at end of year $ 69,737 $ 4,685 $ 10,290 $ 71,201 $ 5,977 $ 10,811 $ 57,283 $ 8,088
Schedule of amounts recognized in other comprehensive income (loss)	Amounts related to our defined benefit pension plans and restoration plan recognized as a component of other comprehensive (loss) income were as follows (in thousands): 2015 2014 2013 Defined Defined Restoration Defined Restoration Defined Restoration Recognition of net loss $ 1,505 $ — $ 943 $ 543 $ 499 $ 2,197 $ 590 Recognition of prior service (credit) cost (23 ) — 7 (19 ) 5 (42 ) (1 ) Recognition of gain due to settlement — (62 ) — — — — — Net gain (loss) occurring during the year 375 463 1,968 (13,761 ) (1,813 ) 19,559 (344 ) Net prior service credit (cost) occurring during the year — — — 43 — (300 ) (57 ) 1,857 401 2,918 (13,194 ) (1,309 ) 21,414 188 Deferred tax (expense) benefit (650 ) (141 ) (1,021 ) 4,618 458 (7,495 ) (66 ) Other comprehensive income (loss), net of tax $ 1,207 $ 260 $ 1,897 $ (8,576 ) $ (851 ) $ 13,919 $ 122
Schedule of amounts in accumulated other comprehensive income (loss) recognized in net periodic benefit cost during period	Net amounts recognized in net periodic benefit cost and other comprehensive loss as of December 31, 2015 and 2014 were as follows (in thousands): 2015 2014 Defined Benefit Pension Plan Defined Restoration Plan Defined Restoration Plan Net loss $ 1,505 $ — $ 943 $ 543 $ 499 Prior service (credit) cost (23 ) — 7 (19 ) 5 Gain recognized due to settlement — (62 ) — — — 1,482 (62 ) 950 524 504 Deferred tax (expense) benefit (519 ) 22 (333 ) (183 ) (176 ) Accumulated other comprehensive income (loss), net of tax $ 963 $ (40 ) $ 617 $ 341 $ 328
Schedule of amounts recognized as a component of accumulated other comprehensive loss	Amounts recognized as a component of accumulated other comprehensive loss as of December 31, 2015 and 2014 were as follows (in thousands): 2015 2014 Defined Defined Restoration Defined Restoration Net (loss) gain $ (25,956 ) $ 401 $ (2,816 ) $ (27,836 ) $ (5,727 ) Prior service credit (cost) 40 — (44 ) 62 (50 ) (25,916 ) 401 (2,860 ) (27,774 ) (5,777 ) Deferred tax benefit 9,071 (141 ) 1,001 9,721 2,022 Accumulated other comprehensive (loss) income, net of tax $ (16,845 ) $ 260 $ (1,859 ) $ (18,053 ) $ (3,755 )
Schedule of components of net periodic pension cost and postretirement benefit cost	Net periodic pension cost and postretirement benefit cost for the years ended December 31, 2015 , 2014 and 2013 included the following components (in thousands): 2015 2014 2013 Defined Benefit Pension Plan Service cost $ 1,838 $ 1,697 $ 2,118 Interest cost 3,410 3,497 3,155 Expected return on assets (5,684 ) (5,648 ) (4,795 ) Net loss amortization 1,505 543 2,197 Prior service credit amortization (23 ) (19 ) (42 ) Special and contractual termination benefits 176 — — Net periodic benefit cost $ 1,222 $ 70 $ 2,633 Defined Benefit Pension Plan Acquired Service cost $ — $ — $ — Interest cost 238 — — Expected return on assets (294 ) — — Net loss amortization — — — Prior service credit amortization — — — Gain recognized due to settlement (62 ) — — Net periodic benefit cost $ (118 ) $ — $ — Restoration Plan Service cost $ 334 $ 275 $ 298 Interest cost 668 563 468 Net loss amortization 943 499 590 Prior service cost (credit) amortization 7 5 (1 ) Net periodic benefit cost $ 1,952 $ 1,342 $ 1,355
Schedule of amounts in accumulated other comprehensive income (loss) that is expected to be recognized as a component of net periodic benefit cost during the next fiscal year	The amounts in accumulated other comprehensive income (loss) that are expected to be recognized as components of net periodic benefit cost during 2016 are as follows (in thousands): Defined Benefit Pension Plan Defined Restoration Net loss $ 1,408 $ — $ 214 Prior service (credit) cost (23 ) — 6 1,385 — 220 Deferred tax benefit (485 ) — (77 ) Accumulated other comprehensive loss, net of tax $ 900 $ — $ 143
Schedule of assumptions used to determine benefit obligation and net periodic benefit cost	At December 31, 2015 and 2014 , the assumptions used to determine the benefit obligation were as follows: 2015 2014 Defined Benefit Defined Restoration Defined Defined Restoration Discount rate 4.56 % 4.56 % 4.56 % 4.14 % 4.14 % 4.14 % Compensation increase rate 3.50 % — 3.50 % 3.50 % — 3.50 % For the years ended December 31, 2015 , 2014 , and 2013 , the assumptions used to determine net periodic pension cost and postretirement benefit cost were as follows: 2015 2014 2013 Defined Benefit Pension Plan Discount rate 4.14 % 5.06 % 4.08 % Expected long-term rate of return on plan assets 7.25 % 7.25 % 7.25 % Compensation increase rate 3.50 % 4.50 % 4.50 % Defined Benefit Pension Plan Acquired Discount rate 4.14 % — — Expected long-term rate of return on plan assets 7.25 % — — Compensation increase rate — — — Restoration Plan Discount rate 4.14 % 5.06 % 4.08 % Compensation increase rate 3.50 % 4.50 % 4.50 %
Schedule of allocation of plan assets	The major categories of assets in our Plan and the Acquired Plan are presented in the following table. Assets are segregated by the level of the valuation inputs within the fair value hierarchy established by ASC Topic 820 “Fair Value Measurements and Disclosures,” utilized to measure fair value (see “Note 12 – Fair Value Measurement”). Our Restoration Plan is unfunded. December 31, 2015 2014 Defined Defined Defined Defined Level 1: (in thousands) Cash $ 588 $ — $ 2,176 $ — Equity Securities: U.S. large cap (1) 26,098 — 25,550 752 U.S. mid cap (2) 7,527 — 7,653 387 U.S. small cap (3) 6,186 — 7,000 1,159 Fixed Income Securities: Corporate bonds (4) — — — 357 International developed (5) 2,975 — 3,320 340 International emerging (2) 1,108 — 1,302 359 Level 2: Cash Equivalents 13,491 — 17,548 — Equity Securities: U.S. large cap — 1,231 — 382 U.S. mid cap — 157 — 415 U.S. small cap — 156 — — International — 514 — — Fixed Income Securities: Corporate bonds (4) 1,443 376 794 — U.S. government agencies (4) 9,116 — 3,583 — Municipal bonds (4) 7,365 — 10,202 — U.S. agency mortgage-backed securities (6) 458 — 602 361 Asset-backed securities (7) — 729 — — Real estate (8) — 189 — — Balanced Asset Allocation (9) — 189 — — Other (10) — 199 — — Total fair value of plan assets $ 76,355 $ 3,740 $ 79,730 $ 4,512 (1) This category is comprised of individual securities that are actively managed and a broadly diversified "passive" mutual fund. (2) This category is comprised of broadly diversified ‘passive’ mutual funds. (3) For the defined benefit pension plan, this category is comprised primarily of Southside Bancshares stock that is owned in the Plan and a broadly diversified "passive" mutual fund. (4) This category is comprised of individual investment grade securities that are generally held to maturity in the Plan. The Acquired Plan assets in this category consist of investment grade and below investment grade bonds. (5) This category is comprised of a broadly ‘passive’ mutual fund. (6) This category is comprised of individual securities that are generally not held to maturity. (7) This category is mainly comprised of asset backed securities, residential mortgage backed securities, commercial mortgage backed securities and corporate bonds. (8) This category is comprised of commercial real estate and includes mortgage loans which are backed by the associated properties. (9) This category is comprised of a combination of fixed income and equity investment options. (10) This category is comprised of a broad range of instruments including, but not limited to, equities, bonds, currencies, convertible securities and derivatives such as futures, options, swaps and forwards.
Schedule of expected future benefit payments related to pension and postretirement plans	of December 31, 2015 , expected future benefit payments related to our defined benefit pension plan, defined benefit pension plan acquired and restoration plan were as follows (in thousands): Defined Benefit Pension Plan Defined Benefit Restoration 2016 $ 2,921 $ 112 $ 346 2017 3,243 56 570 2018 3,565 67 618 2019 3,779 76 668 2020 3,980 230 726 2021 through 2025 22,707 842 4,406 $ 40,195 $ 1,383 $ 7,334
Schedule of stock option valuation assumptions	e estimated weighted-average grant-date fair value per option and the underlying Black-Scholes option-pricing model assumptions are summarized in the following table for years in which we granted NQSO's pursuant to the 2009 plan: Years Ended December 31, 2015 2014 2013 Weighted-average grant date fair value per option $6.29 $— $8.58 Weighted-average assumptions: Risk-free interest rates 2.01% — 2.23% Expected dividend yield 3.24% — 3.10% Expected volatility factors of the market price of Southside Bancshares common stock 30.91% — 40.88% Expected option life (in years) 6.3 — 6.9
Schedule of stock options and restricted stock units award activity	combined summary of activity in our share-based plans as of December 31, 2015 is presented below: Restricted Stock Units Outstanding Stock Options Outstanding Shares Available for Grant Number of Shares Weighted- Average Grant-Date Fair Value Number of Shares Weighted- Average Exercise Price Weighted- Average Grant-Date Fair Value Balance, January 1, 2015 821,604 31,753 $ 21.75 419,334 $ 19.88 $ 6.00 Granted (427,587 ) 57,482 27.63 370,105 28.08 6.29 Stock options exercised — — — (12,895 ) 18.27 5.45 Stock awards vested — (16,497 ) 20.33 — — — Forfeited 32,018 (3,324 ) 25.14 (28,694 ) 24.29 6.69 Canceled/expired 1,254 — — (1,254 ) 24.62 7.78 Balance, December 31, 2015 427,289 69,414 $ 26.79 746,596 $ 23.79 $ 6.12
Schedule of shares stock option exercise price range	her information regarding options outstanding and exercisable as of December 31, 2015 is as follows: Options Outstanding Options Exercisable Range of Exercise Prices Number Weighted- Weighted- Number Weighted- $ 15.79 - 20.00 248,088 $ 17.11 6.08 219,829 $ 16.98 20.01 - 25.00 142,574 24.62 7.92 75,425 24.62 25.01 - 28.51 355,934 28.12 9.39 — — Total 746,596 $ 23.79 8.01 295,254 $ 18.93

FAIR VALUE MEASUREMENT (Tables)

FAIR VALUE MEASUREMENT (Tables)	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Summary of fair value measurement on recurring and nonrecurring basis segregated by level of valuation inputs within fair value hierarchy utilized to measure fair value	The following tables summarize assets measured at fair value on a recurring and nonrecurring basis segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value (in thousands): As of December 31, 2015: Fair Value Measurements at the End of the Reporting Period Using Carrying Amount Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Recurring fair value measurements Investment Securities: U.S. Treasury $ 103,587 $ 103,587 $ — $ — State and Political Subdivisions 244,246 — 244,246 — Other Stocks and Bonds 12,790 — 12,790 — Other Equity Securities 6,016 6,016 — — Mortgage-backed Securities: (1) Residential 588,502 — 588,502 — Commercial 505,351 — 505,351 — Total recurring fair value measurements $ 1,460,492 $ 109,603 $ 1,350,889 $ — Nonrecurring fair value measurements Foreclosed assets $ 808 $ — $ — $ 808 Impaired loans (2) 24,283 — — 24,283 Total nonrecurring fair value measurements $ 25,091 $ — $ — $ 25,091 As of December 31, 2014: Fair Value Measurements at the End of the Reporting Period Using Carrying Amount Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Recurring fair value measurements Investment Securities: U.S. Treasury $ 14,906 $ 14,906 $ — $ — U.S. Government Agency Debentures 4,828 — 4,828 — State and Political Subdivisions 267,684 — 267,684 — Other Stocks and Bonds 13,239 — 13,239 — Other Equity Securities 6,049 6,049 — — Mortgage-backed Securities: (1) Residential 964,298 — 964,298 — Commercial 177,704 — 177,704 — Total recurring fair value measurements $ 1,448,708 $ 20,955 $ 1,427,753 $ — Nonrecurring fair value measurements Foreclosed assets $ 2,303 $ — $ — $ 2,303 Impaired loans (2) 9,404 — — 9,404 Total nonrecurring fair value measurements $ 11,707 $ — $ — $ 11,707 (1) All mortgage-backed securities issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises. (2) Loans represent collateral dependent impaired loans with a specific valuation allowance. Losses on these loans represent charge-offs which are netted against the allowance for loan losses.
Financial assets, financial liabilities, and unrecognized financial instruments at carrying amount and fair value	The following tables present our financial assets, financial liabilities, and unrecognized financial instruments measured on a nonrecurring basis at both their respective carrying amounts and estimated fair value (in thousands): Estimated Fair Value December 31, 2015 Carrying Total Level 1 Level 2 Level 3 Financial Assets: Cash and cash equivalents $ 80,975 $ 80,975 $ 80,975 $ — $ — Investment securities: Held to maturity, at carrying value 385,496 397,194 — 397,194 — Mortgage-backed securities: Held to maturity, at carrying value 398,800 402,569 — 402,569 — FHLB stock and other investments, at cost 56,509 56,509 — 56,509 — Loans, net of allowance for loan losses 2,412,017 2,364,968 — — 2,364,968 Loans held for sale 3,811 3,811 — 3,811 — Financial Liabilities: Retail deposits $ 3,455,407 $ 3,449,002 $ — $ 3,449,002 $ — Federal funds purchased and repurchase agreements 2,429 2,429 — 2,429 — FHLB advances 1,147,688 1,143,218 — 1,143,218 — Long-term debt 60,311 43,695 — 43,695 — Estimated Fair Value December 31, 2014 Carrying Total Level 1 Level 2 Level 3 Financial Assets: Cash and cash equivalents $ 84,655 $ 84,655 $ 84,655 $ — $ — Investment securities: Held to maturity, at carrying value 388,823 400,248 — 400,248 — Mortgage-backed securities: Held to maturity, at carrying value 253,496 261,339 — 261,339 — FHLB stock and other investments, at cost 43,871 43,871 — 43,871 — Loans, net of allowance for loan losses 2,167,841 2,140,088 — — 2,140,088 Loans held for sale 2,899 2,899 — 2,899 — Financial Liabilities: Retail deposits $ 3,374,417 $ 3,369,784 $ — $ 3,369,784 $ — Federal funds purchased and repurchase agreements 4,237 4,237 — 4,237 — FHLB advances 897,420 886,087 — 886,087 — Long-term debt 60,311 43,860 — 43,860 —

SHAREHOLDERS' EQUITY (Tables)

SHAREHOLDERS' EQUITY (Tables)	12 Months Ended
	Dec. 31, 2015
Regulatory Capital Requirements [Abstract]
Schedule of compliance with regulatory capital requirements under ranking regulations	As of December 31, 2015 , the most recent notification from the FDIC categorized us as well capitalized under the regulatory framework for prompt corrective action. To be categorized as well capitalized we must maintain minimum Common Equity Tier 1 risk-based, Tier 1 risk-based, Total risk-based and Tier 1 leverage ratios as set forth in the table. There are no conditions or events since that notification that management believes have changed our category. Actual For Capital Adequacy Purposes To Be Well Capitalized Under Prompt Corrective Actions Provisions Amount Ratio Amount Ratio Amount Ratio As of December 31, 2015: (dollars in thousands) Common Equity Tier 1 (to Risk Weighted Assets) Consolidated $ 368,865 12.71 % $ 130,549 4.50 % N/A N/A Bank Only $ 416,378 14.36 % $ 130,446 4.50 % $ 188,422 6.50 % Tier 1 Capital (to Risk Weighted Assets) Consolidated $ 422,513 14.56 % $ 174,065 6.00 % N/A N/A Bank Only $ 416,378 14.36 % $ 173,928 6.00 % $ 231,904 8.00 % Total Capital (to Risk Weighted Assets) Consolidated $ 443,106 15.27 % $ 232,087 8.00 % N/A N/A Bank Only $ 436,971 15.07 % $ 231,904 8.00 % $ 289,881 10.00 % Tier 1 Capital (to Average Assets) (1) Consolidated $ 422,513 8.61 % $ 196,347 4.00 % N/A N/A Bank Only $ 416,378 8.49 % $ 196,209 4.00 % $ 245,261 5.00 % As of December 31, 2014: Tier 1 Capital (to Risk Weighted Assets) Consolidated $ 398,798 16.12 % $ 98,932 4.00 % N/A N/A Bank Only $ 384,009 15.55 % $ 98,751 4.00 % $ 148,127 6.00 % Total Capital (to Risk Weighted Assets) Consolidated $ 412,893 16.69 % $ 197,863 8.00 % N/A N/A Bank Only $ 398,104 16.13 % $ 197,503 8.00 % $ 246,878 10.00 % Tier 1 Capital (to Average Assets) (1) Consolidated $ 398,798 11.35 % $ 140,492 4.00 % N/A N/A Bank Only $ 384,009 10.95 % $ 140,329 4.00 % $ 175,412 5.00 % (1) Refers to quarterly average assets as calculated in accordance with policies established by bank regulatory agencies.

INCOME TAXES (Tables)

INCOME TAXES (Tables)	12 Months Ended
	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Schedule of components of income tax provision	The income tax expense (benefit) included in the accompanying statements of income consists of the following (in thousands): Years Ended December 31, 2015 2014 2013 Current income tax (benefit) expense $ 10,671 $ (1,239 ) $ 6,041 Deferred income tax (benefit) expense (3,392 ) (925 ) (944 ) Income tax (benefit) expense $ 7,279 $ (2,164 ) $ 5,097
Schedule of net deferred tax assets and liabilities	The components of the net deferred tax asset (liability) as of December 31, 2015 and 2014 are summarized below (in thousands): Assets Liabilities Allowance for loan losses $ 6,907 $ Retirement and other benefit plans (2,220 ) Unrealized gains on securities available for sale (1,298 ) Premises and equipment (5,797 ) Core deposit intangible (2,213 ) Fair value adjustment on loans 5,143 Fair value adjustment on time deposits 302 Alternative minimum tax credit 7,465 Unfunded status of defined benefit plan 9,931 State business tax credit 622 Stock-based compensation 841 Other 220 Gross deferred tax assets (liabilities) 31,431 (11,528 ) Net deferred tax asset at December 31, 2015 $ 19,903 Allowance for loan losses $ 4,625 $ Retirement and other benefit plans (3,250 ) Unrealized losses on securities available for sale (5,112 ) Premises and equipment (7,033 ) Core deposit intangible (2,963 ) Fair value adjustment on loans 6,381 Fair value adjustment on time deposits 767 Alternative minimum tax credit 5,613 Unfunded status of defined benefit plan 11,743 State business tax credit 639 Stock-based compensation 494 Other 803 Gross deferred tax assets (liabilities) 31,065 (18,358 ) Net deferred tax asset at December 31, 2014 $ 12,707
Schedule of income tax reconciliation	A reconciliation of tax at statutory rates and total tax expense is as follows (dollars in thousands): Years Ended December 31, 2015 2014 2013 Amount Percent of Pre-Tax Income Amount Percent of Pre-Tax Income Amount Percent of Pre-Tax Income Statutory tax expense $ 17,946 35.0 % $ 6,348 34.0 % $ 15,738 34.0 % Increase (decrease) in taxes from: Tax exempt interest (9,975 ) (19.5 )% (9,942 ) (53.3 )% (10,298 ) (22.2 )% Bank owned life insurance (914 ) (1.8 )% (451 ) (2.4 )% (1,059 ) (2.3 )% Share based compensation (75 ) (0.1 )% 766 4.1 % — — % Acquisition costs — — % 787 4.2 % — — % State business tax — — % 146 0.8 % 350 0.7 % Other, net 297 0.6 % 182 1.0 % 366 0.8 % Income tax (benefit) expense $ 7,279 14.2 % $ (2,164 ) (11.6 )% $ 5,097 11.0 %

OFF-BALANCE-SHEET ARRANGEMENT43

OFF-BALANCE-SHEET ARRANGEMENTS, COMMITMENTS AND CONTINGENCIES (Tables)	12 Months Ended
	Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Scheduled maturities of unused commitments	Financial instruments with off-balance-sheet risk were as follows (in thousands): At At Unused commitments: Commitments to extend credit $ 546,660 $ 373,255 Standby letters of credit 7,752 6,222 Total $ 554,412 $ 379,477
Future minimum commitments of non-cancelable operating leases	Future minimum rental commitments due under non-cancelable operating leases at December 31, 2015 were as follows (in thousands): 2016 $ 1,988 2017 1,523 2018 1,245 2019 861 2020 580 Thereafter 267 $ 6,464
Schedule of future minimum rental payments receivable under non-cancelable operating leases	At December 31, 2015 , non-cancelable operating leases for the building with future minimum lease payments are as follows (in thousands): 2016 $ 3,093 2017 2,746 2018 2,023 2019 1,684 2020 1,572 Thereafter 4,002 $ 15,120

PARENT COMPANY FINANCIAL INFO44

PARENT COMPANY FINANCIAL INFORMATION (Tables)	12 Months Ended
	Dec. 31, 2015
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
CONDENSED BALANCE SHEETS	Condensed financial information for Southside Bancshares, Inc. (parent company only) was as follows (in thousands, except share amounts): CONDENSED BALANCE SHEETS December 31, 2015 2014 ASSETS Cash and due from banks $ 1,766 $ 11,696 Investment in bank subsidiaries at equity in underlying net assets 494,130 466,374 Investment in nonbank subsidiaries at equity in underlying net assets 1,826 1,826 Other assets 7,282 9,998 TOTAL ASSETS $ 505,004 $ 489,894 LIABILITIES Long-term debt $ 60,311 $ 60,311 Other liabilities 631 4,340 TOTAL LIABILITIES 60,942 64,651 SHAREHOLDERS' EQUITY Common stock ($1.25 par, 40,000,000 shares authorized, 27,865,798 shares issued in 2015 and 26,578,127 shares issued in 2014) 34,832 33,223 Paid-in capital 424,078 389,886 Retained earnings 41,527 55,396 Treasury stock (2,469,638 shares at cost) (37,692 ) (37,692 ) Accumulated other comprehensive loss (18,683 ) (15,570 ) TOTAL SHAREHOLDERS' EQUITY 444,062 425,243 TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY $ 505,004 $ 489,894
CONDENSED STATEMENTS OF INCOME	CONDENSED STATEMENTS OF INCOME Years Ended December 31, 2015 2014 2013 INCOME (in thousands) Dividends from subsidiary $ 17,600 $ 177,000 $ 15,000 Interest income 44 53 43 TOTAL INCOME 17,644 177,053 15,043 EXPENSE Interest expense 1,455 1,424 1,449 Other 3,193 16,144 2,461 TOTAL EXPENSE 4,648 17,568 3,910 Income before income tax expense 12,996 159,485 11,133 Income tax benefit 1,612 4,043 1,315 Income before equity in undistributed earnings of subsidiaries 14,608 163,528 12,448 Equity in undistributed earnings of subsidiaries 29,389 (142,695 ) 28,742 NET INCOME $ 43,997 $ 20,833 $ 41,190
CONDENSED STATEMENTS OF CASH FLOW	CONDENSED STATEMENTS OF CASH FLOW Years Ended December 31, 2015 2014 2013 (in thousands) OPERATING ACTIVITIES: Net Income $ 43,997 $ 20,833 $ 41,190 Adjustments to reconcile net income to net cash provided by operations: Equity in undistributed earnings of subsidiaries (29,389 ) 142,695 (28,742 ) Decrease (increase) in other assets 2,716 (6,477 ) 1,032 (Decrease) increase in other liabilities (3,709 ) 3,904 319 Net cash provided by operating activities 13,615 160,955 13,799 INVESTING ACTIVITIES: Investment in subsidiaries (10 ) — — Net cash paid for acquisition — (136,078 ) — Dissolution of subsidiaries — — 1,153 Net cash (used in) provided by investing activities (10 ) (136,078 ) 1,153 FINANCING ACTIVITIES: Purchase of common stock — — (1,899 ) Proceeds from issuance of common stock 1,536 2,287 1,551 Dividends paid (25,071 ) (17,919 ) (16,088 ) Payments for other financing activities — (599 ) — Net cash used in financing activities (23,535 ) (16,231 ) (16,436 ) Net (decrease) increase in cash and cash equivalents (9,930 ) 8,646 (1,484 ) Cash and cash equivalents at beginning of year 11,696 3,050 4,534 Cash and cash equivalents at end of year $ 1,766 $ 11,696 $ 3,050

QUARTERLY FINANCIAL INFORMATI45

QUARTERLY FINANCIAL INFORMATION OF REGISTRANT (Tables)	12 Months Ended
	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Schedule of quarterly financial information	2015 Fourth Quarter Third Quarter Second Quarter First Quarter Interest income $ 39,964 $ 38,211 $ 37,750 $ 38,607 Interest expense 5,267 4,926 4,845 4,816 Net interest income 34,697 33,285 32,905 33,791 Provision for loan losses 1,951 2,276 268 3,848 Net gain on sale of securities available for sale 204 875 105 2,476 Noninterest income excluding net securities gains 8,611 8,486 8,826 8,312 Noninterest expense 28,431 26,637 28,437 29,449 Income before income tax expense 13,130 13,733 13,131 11,282 Provision for income tax expense 1,438 1,971 1,967 1,903 Net income 11,692 11,762 11,164 9,379 Earnings per common share Basic $ 0.46 $ 0.46 $ 0.44 $ 0.37 Diluted $ 0.46 $ 0.46 $ 0.44 $ 0.37 2014 Fourth Quarter Third Quarter Second Quarter First Quarter Interest income $ 29,613 $ 29,840 $ 32,086 $ 32,239 Interest expense 4,259 4,120 4,230 4,347 Net interest income 25,354 25,720 27,856 27,892 Provision for loan losses 3,287 4,868 2,650 4,133 Net gain on sale of securities available for sale 1,170 1,151 498 11 Noninterest income excluding net securities gains 5,979 3,868 6,017 5,795 Noninterest expense 37,079 20,017 20,426 20,182 (Loss) income before income tax expense (7,863 ) 5,854 11,295 9,383 Provision for income tax (benefit) expense (3,918 ) (243 ) 838 1,159 Net (loss) income (3,945 ) 6,097 10,457 8,224 (Loss) earnings per common share Basic $ (0.19 ) $ 0.31 $ 0.53 $ 0.41 Diluted $ (0.19 ) $ 0.31 $ 0.53 $ 0.41

SUMMARY OF SIGNIFICANT ACCOUN46

SUMMARY OF SIGNIFICANT ACCOUNTING AND REPORTING POLICIES (Details)	12 Months Ended
	Dec. 31, 2015USD ($)segment	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)
Organization and Basis of Presentation [Abstract]
Number of banking centers	60
Number of banking centers in grocery stores	18
Segment Information [Abstract]
Number of reportable segments | segment	1
Cash and Cash Equivalents [Abstract]
Restricted Cash and Cash Equivalents, Current	$ 19,400,000	$ 13,400,000
Goodwill and Other Intangible Assets [Abstract]
New Date of Annual Goodwill Impairment Test	October 1
Goodwill, Impairment Loss	$ 0
Marketing and Advertising Expense [Abstract]
Advertising Expense	1,000,000	1,000,000	$ 1,300,000
Core deposits
Goodwill and Other Intangible Assets [Abstract]
Amortization expense of intangible assets	$ 2,200,000	$ 187,000	$ 146,000
Premises | Minimum
Premises and Equipment [Abstract]
Estimated useful life	15 years
Premises | Maximum
Premises and Equipment [Abstract]
Estimated useful life	40 years
Equipment | Minimum
Premises and Equipment [Abstract]
Estimated useful life	3 years
Equipment | Maximum
Premises and Equipment [Abstract]
Estimated useful life	10 years

SUMMARY OF SIGNIFICANT ACCOUN47

SUMMARY OF SIGNIFICANT ACCOUNTING AND REPORTING POLICIES Stock Dividend (Details)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Dividends, Common Stock [Abstract]
Dividends Payable, Date Declared	Apr. 13, 2015	Mar. 20, 2014
Stock dividend, percentage of common stock	5.00%	5.00%	5.00%
Dividends Payable, Date of Record	Apr. 27, 2015	Apr. 10, 2014
Dividends Payable, Date to be Paid	May 14, 2015	May 1, 2014

SUMMARY OF SIGNIFICANT ACCOUN48

SUMMARY OF SIGNIFICANT ACCOUNTING AND REPORTING POLICIES Subsequent Event (Details) - $ / shares	Jan. 28, 2016	Mar. 02, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Subsequent Event [Line Items]
Treasury Stock, Shares, Acquired			0	0	90,300
Subsequent Event
Subsequent Event [Line Items]
Subsequent Event, Date	Jan. 28, 2016
Subsequent Event, Description	Board of Directors approved a Stock Repurchase Plan
Stock Repurchase Program, Percent of Issued and Outstanding Shares Authorized to be Repurchased	5.00%
Stock Repurchase Program, Number of Shares Authorized to be Repurchased	1,270,000
Treasury Stock, Shares, Acquired		424,701
Treasury Stock Acquired, Average Cost Per Share		$ 22.89

ACQUISITION (Details)

ACQUISITION (Details) $ / shares in Units, $ in Thousands		Dec. 17, 2014USD ($)$ / sharesshares	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)
Business Acquisition [Line Items]
Acquisition, goodwill			$ 91,520	$ 91,372
Acquisition, professional fees			3,877	7,827	$ 2,782
Acquisition, software and data processing expense			3,858	4,629	$ 2,018
OmniAmerican Bancorp, Inc.
Business Acquisition [Line Items]
Acquisition, effective date of acquisition		Dec. 17, 2014
Percentage of company acquired		100.00%
OmniAmerican Bancorp, Inc.		OmniAmerican Bancorp, Inc.
Number of banking offices		14
Acquisition, closing stock price per share | $ / shares		$ 29.39
Acquisition,number of shares issued | shares		5,200,000
Acquisition, cash paid		$ 157,408
Acquisition, total merger consideration		298,310
Acquisition, assets		1,360,000
Loans			763,486
Acquisition, investment securities		428,400	428,447
Acquisition, liabilities assumed		(1,130,000)
Acquisition, deposits		801,300	801,327
Acquisition, goodwill		69,300	$ 69,486
Acquisition, finite-lived intangible assets		300
Acquisition, merger related expenses				15,900
Acquisition, professional fees				4,400
Acquisition, software and data processing expense				$ 2,600
Cost related to issuance of shares related to the merger		599
Share-based compensation expense	[1]	$ 8,874
Noncash or Part Noncash Acquisition, Company Stock Consideration, Per Each Share of Acquiree Stock, Shares Issued | shares		0.4459
Noncash or Part Noncash Acquisition, Cash Consideration, Per Each Share of Acquiree Stock | $ / shares		$ 13.125
Loans | OmniAmerican Bancorp, Inc.
Business Acquisition [Line Items]
Loans		$ 763,300
Core deposits | OmniAmerican Bancorp, Inc.
Business Acquisition [Line Items]
Acquisition, finite-lived intangible assets		$ 8,600
Amortization period		10 years
Noncompete Agreements | OmniAmerican Bancorp, Inc.
Business Acquisition [Line Items]
Acquisition, finite-lived intangible assets		$ 300
Amortization period		3 years
[1]	In connection with the merger, we recorded the unvested stock options and the non-vested restricted stock awards as a post-combination expense.

ACQUISITION - Schedule of comp

ACQUISITION - Schedule of components of consideration paid (Details) - USD ($) $ in Thousands		Dec. 17, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Business Acquisition [Line Items]
Common stock issued			$ 0	$ 151,891	$ 0
OmniAmerican Bancorp, Inc.
Business Acquisition [Line Items]
Common stock issued		$ 151,891
Acquisition, cash paid		157,408
Share-based compensation expense	[1]	8,874
Reimbursement of contract cancellation fees		1,815
Non-compete agreements		300
Total consideration paid		$ 298,310
[1]	In connection with the merger, we recorded the unvested stock options and the non-vested restricted stock awards as a post-combination expense.

ACQUISITION - Assets Acquired a

ACQUISITION - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014	Dec. 17, 2014
Business Acquisition [Line Items]
Goodwill		$ 91,520	$ 91,372
OmniAmerican Bancorp, Inc.
Business Acquisition [Line Items]
Cash, cash equivalents, and amounts due from banks		21,214
Other investments		17,043
Securities available for sale		428,447		$ 428,400
Loans held for sale		748
Loans		763,486
Property and equipment		58,928
Bank owned life insurance		44,964
Other assets		12,439
Core deposit intangible		8,570
Goodwill		69,486		69,300
Deposits		(801,327)		(801,300)
Short-term borrowings		(7,000)
Federal Home Loan Bank advances		(308,516)
Deferred tax liability, net		(3,926)
Other liabilities		(6,246)
Fair values of assets acquired and liabilities assumed		$ 298,310
As Originally Reported (1) | OmniAmerican Bancorp, Inc.
Business Acquisition [Line Items]
Cash, cash equivalents, and amounts due from banks				0
Other investments				1,345
Securities available for sale				0
Loans held for sale				0
Loans				159
Property and equipment				0
Bank owned life insurance				0
Other assets				(970)
Core deposit intangible				0
Goodwill				148
Deposits				0
Short-term borrowings				0
Federal Home Loan Bank advances				0
Deferred tax liability, net				(682)
Other liabilities				0
Fair values of assets acquired and liabilities assumed				0
Measurement Period Adjustments | OmniAmerican Bancorp, Inc.
Business Acquisition [Line Items]
Cash, cash equivalents, and amounts due from banks	[1]			21,214
Other investments	[1]			15,698
Securities available for sale	[1]			428,447
Loans held for sale	[1]			748
Loans	[1]			763,327
Property and equipment	[1]			58,928
Bank owned life insurance	[1]			44,964
Other assets	[1]			13,409
Core deposit intangible	[1]			8,570
Goodwill	[1]			69,338
Deposits	[1]			(801,327)
Short-term borrowings	[1]			(7,000)
Federal Home Loan Bank advances	[1]			(308,516)
Deferred tax liability, net	[1]			(3,244)
Other liabilities	[1]			(6,246)
Fair values of assets acquired and liabilities assumed	[1]			$ 298,310
[1]	The estimated fair value as of the acquisition date, December 17, 2014, as previously reported in our Form 10-K for the year ended December 31, 2014.

ACQUISITION - Changes in the ca

ACQUISITION - Changes in the carrying amount of Goodwill (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)
Goodwill [Roll Forward]
Balance as of December 31, 2014	$ 91,372
Plus: measurement period adjustments	148
Balance as of December 31, 2015	$ 91,520

ACQUISITION - PCI Loans (Detail

ACQUISITION - PCI Loans (Details) - OmniAmerican Bancorp, Inc. $ in Thousands	Dec. 17, 2014USD ($)
Business Acquisition [Line Items]
Contractually required principal and interest payments	$ 46,647
Certain Loans Acquired in Transfer, Nonaccretable Difference	23,262
Cash flows expected to be collected	23,385
Certain Loans Acquired in Transfer, Accretable Yield	1,898
Fair value of loans acquired with a deterioration of credit quality	$ 21,487

ACQUISITION - Acquired Performi

ACQUISITION - Acquired Performing Loans (Details) - OmniAmerican Bancorp, Inc. - Performing loans $ in Thousands	Dec. 17, 2014USD ($)
Business Acquisition [Line Items]
Fair Value at Acquisition Date	$ 742,588
Contractual Amounts Receivable	1,190,646
Cash Flows Not Expected to be Collected at Acquisition Date (1)	311,599	[1]
Construction Real Estate Loans
Business Acquisition [Line Items]
Fair Value at Acquisition Date	49,625
Contractual Amounts Receivable	56,877
Cash Flows Not Expected to be Collected at Acquisition Date (1)	3,947	[1]
1-4 Family Residential Real Estate Loans
Business Acquisition [Line Items]
Fair Value at Acquisition Date	282,577
Contractual Amounts Receivable	608,986
Cash Flows Not Expected to be Collected at Acquisition Date (1)	248,669	[1]
Commercial Real Estate Loans
Business Acquisition [Line Items]
Fair Value at Acquisition Date	152,087
Contractual Amounts Receivable	190,920
Cash Flows Not Expected to be Collected at Acquisition Date (1)	15,692	[1]
Commercial Loans
Business Acquisition [Line Items]
Fair Value at Acquisition Date	59,007
Contractual Amounts Receivable	72,583
Cash Flows Not Expected to be Collected at Acquisition Date (1)	8,602	[1]
Loans to Individuals
Business Acquisition [Line Items]
Fair Value at Acquisition Date	199,292
Contractual Amounts Receivable	261,280
Cash Flows Not Expected to be Collected at Acquisition Date (1)	$ 34,689	[1]
[1]	(1) Cash flows not expected to be collected relate to estimated credit losses and expected prepayments.

ACQUISITION - Proforma Informat

ACQUISITION - Proforma Information (Details) - OmniAmerican Bancorp, Inc. - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Business Acquisition [Line Items]
Pro forma net income	$ 33.3	$ 38.8
Pro forma revenue	$ 209	$ 221.6

ACQUISITION - Narrative (Detail

ACQUISITION - Narrative (Details) - OmniAmerican Bancorp, Inc. $ in Millions	12 Months Ended
	Dec. 31, 2015USD ($)	Dec. 17, 2014category
Other Investments
Business Acquisition [Line Items]
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Assets	$ 1.4
Other Assets
Business Acquisition [Line Items]
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Assets	$ (1)
Core deposits
Business Acquisition [Line Items]
Number of categories | category		2

EARNINGS PER SHARE (Details)

EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Basic and Diluted Earnings:
Net Income	$ 11,692	$ 11,762	$ 11,164	$ 9,379	$ (3,945)	$ 6,097	$ 10,457	$ 8,224	$ 43,997	$ 20,833	$ 41,190
Basic weighted-average shares outstanding:									25,350	20,028	19,709
Add: Stock options									85	99	42
Diluted weighted-average shares outstanding									25,435	20,127	19,751
Basic Earnings Per Share:
Earnings per common share - basic (in dollars per share)	$ 0.46	$ 0.46	$ 0.44	$ 0.37	$ (0.19)	$ 0.31	$ 0.53	$ 0.41	$ 1.74	$ 1.04	$ 2.09
Diluted Earnings Per Share:
Earnings per common share - diluted (in dollars per share)	$ 0.46	$ 0.46	$ 0.44	$ 0.37	$ (0.19)	$ 0.31	$ 0.53	$ 0.41	$ 1.73	$ 1.04	$ 2.09
Antidilutive securities from non-qualified stock options excluded from calculating earnings
Number of antidilutive options									33	10	4

ACCUMULATED OTHER COMPREHENSI58

ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME - Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance, net of tax	$ (15,570)	$ (21,037)	$ 2,938
Other comprehensive (loss) income before reclassifications	(3,561)	10,212	(31,199)
Reclassified from accumulated other comprehensive income	(1,228)	(1,802)	(5,686)
Income tax benefit (expense)	1,676	(2,943)	12,910
Net current-period other comprehensive (loss) income, net of tax	(3,113)	5,467	(23,975)
Ending balance, net of tax	(18,683)	(15,570)	(21,037)
Unrealized Gains (Losses) on Securities - Other
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance, net of tax	6,238	(8,656)	30,500
Other comprehensive (loss) income before reclassifications	(6,305)	25,743	(50,810)
Reclassified from accumulated other comprehensive income	(3,660)	(2,830)	(9,431)
Income tax benefit (expense)	3,488	(8,019)	21,085
Net current-period other comprehensive (loss) income, net of tax	(6,477)	14,894	(39,156)
Ending balance, net of tax	(239)	6,238	(8,656)
Other-than-Temporary Impairment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance, net of tax	0	0	(1,140)
Other comprehensive (loss) income before reclassifications	0	0	753
Reclassified from accumulated other comprehensive income	0	0	1,001
Income tax benefit (expense)	0	0	(614)
Net current-period other comprehensive (loss) income, net of tax	0	0	1,140
Ending balance, net of tax	0	0	0
Net Prior Service (Cost) Credit
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance, net of tax	7	(12)	248
Other comprehensive (loss) income before reclassifications	(62)	43	(357)
Reclassified from accumulated other comprehensive income	(16)	(14)	(43)
Income tax benefit (expense)	27	(10)	140
Net current-period other comprehensive (loss) income, net of tax	(51)	19	(260)
Ending balance, net of tax	(44)	7	(12)
Net Gain (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance, net of tax	(21,815)	(12,369)	(26,670)
Other comprehensive (loss) income before reclassifications	2,806	(15,574)	19,215
Reclassified from accumulated other comprehensive income	2,448	1,042	2,787
Income tax benefit (expense)	(1,839)	5,086	(7,701)
Net current-period other comprehensive (loss) income, net of tax	3,415	(9,446)	14,301
Ending balance, net of tax	$ (18,400)	$ (21,815)	$ (12,369)

ACCUMULATED OTHER COMPREHENSI59

ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME -Reclassifications out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Realized gain on sale of securities		$ 204	$ 875	$ 105	$ 2,476	$ 1,170	$ 1,151	$ 498	$ 11	$ 3,660	$ 2,830	$ 8,472
Net loss										2,448	1,042	2,787
Prior service (credit) cost										(16)	(14)	(43)
Tax (expense) benefit		(1,438)	(1,971)	(1,967)	(1,903)	3,918	243	(838)	(1,159)	(7,279)	2,164	(5,097)
Net of tax		$ 11,692	$ 11,762	$ 11,164	$ 9,379	$ (3,945)	$ 6,097	$ 10,457	$ 8,224	43,997	20,833	41,190
Total reclassifications for the period, net of tax										43,997	20,833	41,190
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period, net of tax										798	1,170	3,695
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized gains and losses on available for sale securities:
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Realized gain on sale of securities	[1]									3,660	2,830	8,472
Impairment losses	[2]									0	0	(42)
Total before tax										3,660	2,830	8,430
Tax (expense) benefit										(1,281)	(991)	(2,951)
Net of tax										2,379	1,839	5,479
Reclassification out of Accumulated Other Comprehensive Income [Member] | Amortization of pension plan:
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net loss	[3]									(2,448)	(1,042)	(2,787)
Prior service (credit) cost	[3]									16	14	43
Total before tax										(2,432)	(1,028)	(2,744)
Tax (expense) benefit										851	359	960
Net of tax										$ (1,581)	$ (669)	$ (1,784)
[1]	Listed as net gain on sale of securities available for sale on the consolidated statements of income.
[2]	Included in other in noninterest income on the consolidated statements of income.
[3]	These accumulated other comprehensive income components are included in the computation of net periodic pension cost presented in “Note 11 - Employee Benefits.”

SECURITIES - Schedule of Debt

SECURITIES - Schedule of Debt and Equity Securities Components (Details) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
AVAILABLE FOR SALE:
Amortized Cost		$ 1,452,001	$ 1,427,993
Gross unrealized gains, in OCI		18,033	22,605
Gross unrealized losses, in OCI		9,542	1,890
Estimated fair value		1,460,492	1,448,708
HELD TO MATURITY:
Amortized cost		793,154	653,436
Gross unrealized gains, in OCI		6,005	5,168
Gross unrealized losses, in OCI		14,863	16,285
Carrying value		784,296	642,319
Gross unrealized gains, not in OCI		19,311	20,513
Gross unrealized losses, not in OCI		3,844	1,245
Estimated fair value		799,763	661,587
US Treasury
AVAILABLE FOR SALE:
Amortized Cost		103,906	14,883
Gross unrealized gains, in OCI		61	30
Gross unrealized losses, in OCI		380	7
Estimated fair value		103,587	14,906
U.S. Government Agency Debentures
AVAILABLE FOR SALE:
Amortized Cost		0	4,835
Gross unrealized gains, in OCI		0	0
Gross unrealized losses, in OCI		0	7
Estimated fair value		0	4,828
State and Political Subdivisions
AVAILABLE FOR SALE:
Amortized Cost		236,534	260,535
Gross unrealized gains, in OCI		8,323	8,055
Gross unrealized losses, in OCI		611	906
Estimated fair value		244,246	267,684
HELD TO MATURITY:
Amortized cost		389,997	393,525
Gross unrealized gains, in OCI		4,772	5,168
Gross unrealized losses, in OCI		9,273	9,870
Carrying value		385,496	388,823
Gross unrealized gains, not in OCI		13,061	12,181
Gross unrealized losses, not in OCI		1,363	756
Estimated fair value		397,194	400,248
Other Stocks and Bonds
AVAILABLE FOR SALE:
Amortized Cost		12,772	13,086
Gross unrealized gains, in OCI		63	153
Gross unrealized losses, in OCI		45	0
Estimated fair value		12,790	13,239
Other Equity Securities
AVAILABLE FOR SALE:
Amortized Cost		6,052	6,061
Gross unrealized gains, in OCI		0	0
Gross unrealized losses, in OCI		36	12
Estimated fair value		6,016	6,049
Residential
AVAILABLE FOR SALE:
Amortized Cost	[1]	580,621	952,481
Gross unrealized gains, in OCI	[1]	9,120	12,624
Gross unrealized losses, in OCI	[1]	1,239	807
Estimated fair value	[1]	588,502	964,298
HELD TO MATURITY:
Amortized cost	[1]	31,430	52,287
Gross unrealized gains, in OCI	[1]	0	0
Gross unrealized losses, in OCI	[1]	51	70
Carrying value	[1]	31,379	52,217
Gross unrealized gains, not in OCI	[1]	2,018	2,871
Gross unrealized losses, not in OCI	[1]	1	0
Estimated fair value	[1]	33,396	55,088
Commercial
AVAILABLE FOR SALE:
Amortized Cost	[1]	512,116	176,112
Gross unrealized gains, in OCI	[1]	466	1,743
Gross unrealized losses, in OCI	[1]	7,231	151
Estimated fair value	[1]	505,351	177,704
HELD TO MATURITY:
Amortized cost	[1]	371,727	207,624
Gross unrealized gains, in OCI	[1]	1,233	0
Gross unrealized losses, in OCI	[1]	5,539	6,345
Carrying value	[1]	367,421	201,279
Gross unrealized gains, not in OCI	[1]	4,232	5,461
Gross unrealized losses, not in OCI	[1]	2,480	489
Estimated fair value	[1]	$ 369,173	$ 206,251
[1]	All mortgage-backed securities issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.

SECURITIES - Unrealized Loss o

SECURITIES - Unrealized Loss on Securities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months, fair value	$ 740,522	$ 412,880
More than 12 months, fair value	28,197	82,017
Total fair value	768,719	494,897
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss [Abstract]
Less than 12 months, unrealized loss position	8,831	743
More than 12 months, unrealized loss position	711	1,147
Unrealized loss position	9,542	1,890
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months, fair value	219,767	7,843
More than 12 months, fair value	64,721	109,090
Total fair value	284,488	116,933
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]
Less than 12 months, unrealized loss	2,654	31
More than 12 months, unrealized loss	1,190	1,214
Total unrealized loss	3,844	1,245
US Treasury
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months, fair value	64,172	4,968
More than 12 months, fair value	0	0
Total fair value	64,172	4,968
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss [Abstract]
Less than 12 months, unrealized loss position	380	7
More than 12 months, unrealized loss position	0	0
Unrealized loss position	380	7
U.S. Government Agency Debentures
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months, fair value	0	4,828
More than 12 months, fair value	0	0
Total fair value	0	4,828
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss [Abstract]
Less than 12 months, unrealized loss position	0	7
More than 12 months, unrealized loss position	0	0
Unrealized loss position	0	7
State and Political Subdivisions
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months, fair value	15,550	28,155
More than 12 months, fair value	19,270	44,269
Total fair value	34,820	72,424
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss [Abstract]
Less than 12 months, unrealized loss position	116	90
More than 12 months, unrealized loss position	495	816
Unrealized loss position	611	906
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months, fair value	24,340	7,843
More than 12 months, fair value	62,240	64,946
Total fair value	86,580	72,789
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]
Less than 12 months, unrealized loss	214	31
More than 12 months, unrealized loss	1,149	725
Total unrealized loss	1,363	756
Other Stocks and Bonds
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months, fair value	2,954	0
More than 12 months, fair value	0	0
Total fair value	2,954	0
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss [Abstract]
Less than 12 months, unrealized loss position	45	0
More than 12 months, unrealized loss position	0	0
Unrealized loss position	45	0
Other Equity Securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months, fair value	6,016	6,049
More than 12 months, fair value	0	0
Total fair value	6,016	6,049
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss [Abstract]
Less than 12 months, unrealized loss position	36	12
More than 12 months, unrealized loss position	0	0
Unrealized loss position	36	12
Residential
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months, fair value	229,514	347,777
More than 12 months, fair value	3,817	27,632
Total fair value	233,331	375,409
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss [Abstract]
Less than 12 months, unrealized loss position	1,215	573
More than 12 months, unrealized loss position	24	234
Unrealized loss position	1,239	807
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months, fair value	1,717	0
More than 12 months, fair value	0	0
Total fair value	1,717	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]
Less than 12 months, unrealized loss	1	0
More than 12 months, unrealized loss	0	0
Total unrealized loss	1	0
Commercial
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months, fair value	422,316	21,103
More than 12 months, fair value	5,110	10,116
Total fair value	427,426	31,219
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss [Abstract]
Less than 12 months, unrealized loss position	7,039	54
More than 12 months, unrealized loss position	192	97
Unrealized loss position	7,231	151
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months, fair value	193,710	0
More than 12 months, fair value	2,481	44,144
Total fair value	196,191	44,144
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]
Less than 12 months, unrealized loss	2,439	0
More than 12 months, unrealized loss	41	489
Total unrealized loss	$ 2,480	$ 489

SECURITIES - Other Than Tempor

SECURITIES - Other Than Temporary Impairment (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Balance, beginning of the period		$ 0	$ 3,256,000
Additions for credit losses recognized on debt securities that had previously incurred impairment losses	$ 0	$ 0	42,000
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Sold			(3,298,000)
Balance, end of the period			$ 0

SECURITIES - Interest Income o

SECURITIES - Interest Income on Securities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Interest Income Recognized on Securities [Abstract]
U.S. Treasury	$ 1,132	$ 264	$ 17
U.S. Government Agency Debentures	118	104	440
State and Political Subdivisions	22,474	24,077	25,620
Other Stocks and Bonds	213	208	205
Other Equity Securities	118	0	0
Mortgage-backed Securities	33,661	28,207	20,085
Total interest income on securities	$ 57,716	$ 52,860	$ 46,367

SECURITIES - Amortized Cost an

SECURITIES - Amortized Cost and Estimated Fair Value of Investments in Debt Securities By Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Due in one year or less	$ 21,207
Due after one year through five years	13,438
Due after five years through ten years	133,958
Due after ten years	184,609
Subtotal	353,212
Mortgage-backed securities and other equity securities	1,098,789
Total	1,452,001
Available-for-sale Securities, Fair Value [Abstract]
Due in one year or less	21,313
Due after one year through five years	13,773
Due after five years through ten years	134,507
Due after ten years	191,030
Subtotal	360,623
Mortgage-backed securities and other equity securities	1,099,869
Total	1,460,492	$ 1,448,708
Held to Maturity Securities, Carrying Value [Abstract]
Due in one year or less	2,437
Due after one year through five years	16,196
Due after five years through ten years	57,508
Due after ten years	309,355
Subtotal	385,496
Mortgage-backed securities	398,800
Carrying value	784,296	$ 642,319
Held to Maturity Securities, Fair Value [Abstract]
Due in one year or less	2,434
Due after one year through five years	16,322
Due after five years through ten years	58,719
Due after ten years	319,719
Subtotal	397,194
Mortgage-backed securities	402,569
Total	$ 799,763

SECURITIES - Narrative (Details

SECURITIES - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Commercial Mortgage Backed Securities, Reclassified From Available For Sale To Held To Maturity, Fair Value	$ 57,700,000
Available for sale securities, transferred to held to maturity, unrealized (loss) gain	1,300,000
Available for sale securities, transferred to held to maturity, unrealized (loss) gain, net of tax	864,000
Transfer of available for sale securities to held to maturity securities	57,724,000	$ 0	$ 452,884,000
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses	0	0	42,000
Other than Temporary Impairment Losses, Investments [Abstract]
Trust Preferred Securities, Amortized Cost			2,700,000
Available for sale securities, TRUPS, net realized (loss) gain on sale			(959,000)
Proceeds from sale of held-to-maturity securities	0	0
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]
Realized losses	1,200,000	5,400,000	6,400,000
Realized gains	4,900,000	8,200,000	14,900,000
Net securities gains from AFS portfolio	3,700,000	2,800,000	$ 8,500,000
Securities pledged as collateral, book value	$ 1,330,000,000	$ 1,120,000,000

LOANS AND ALLOWANCE FOR PROBA66

LOANS AND ALLOWANCE FOR PROBABLE LOAN LOSSES - Loans by Portfolio Segment (Details) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
Loans and Leases Receivable Disclosure [Abstract]
Total ending loans balance	[1]	$ 2,431,753	$ 2,181,133
Less: Allowance for loan losses		19,736	13,292
Net loans		2,412,017	2,167,841
Construction Real Estate Loans
Loans and Leases Receivable Disclosure [Abstract]
Total ending loans balance		438,247	267,830
1-4 Family Residential Real Estate Loans
Loans and Leases Receivable Disclosure [Abstract]
Total ending loans balance		655,410	690,895
Commercial Real Estate Loans
Loans and Leases Receivable Disclosure [Abstract]
Total ending loans balance		635,210	468,171
Commercial Loans
Loans and Leases Receivable Disclosure [Abstract]
Total ending loans balance		242,527	226,460
Municipal Loans
Loans and Leases Receivable Disclosure [Abstract]
Total ending loans balance		288,115	257,492
Loans to Individuals
Loans and Leases Receivable Disclosure [Abstract]
Total ending loans balance		172,244	270,285
OmniAmerican Bancorp, Inc.
Loans and Financing Receivable [Line Items]
Loans Acquired, Carrying Amount		581,100	763,300
Loans and Leases Receivable Disclosure [Abstract]
Less: Allowance for loan losses		$ 629	$ 0
[1]	Includes approximately $581.1 million and $763.3 million as of December 31, 2015 and 2014, respectively, of loans acquired with the Omni acquisition on December 17, 2014. These loans were measured at fair value at the acquisition date with no carryover of allowance for loan loss. The allowance for loan loss recorded on acquired loans for the year ended December 31, 2015 totaled $629,000.

LOANS AND ALLOWANCE FOR PROBA67

LOANS AND ALLOWANCE FOR PROBABLE LOAN LOSSES - Allowance for Loan Losses Activity by Portfolio Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013
Change in Allowances for Loan Losses [Abstract]
Balance at beginning of period	$ 13,292	[1]	$ 18,877		$ 20,585
Provision (reversal) for loan losses	8,343		14,938		8,879
Distribution of other allowance	0		0		0
Loans charged off	(4,355)		(22,563)		(13,574)
Recoveries of loans charged off	2,456		2,040		2,987
Balance at end of period	19,736		13,292	[1]	18,877
Construction Real Estate Loans
Change in Allowances for Loan Losses [Abstract]
Balance at beginning of period	2,456	[1]	2,142		2,355
Provision (reversal) for loan losses	1,711		172		(290)
Distribution of other allowance	0		0		0
Loans charged off	(24)		(14)		0
Recoveries of loans charged off	207		156		77
Balance at end of period	4,350		2,456	[1]	2,142
1-4 Family Residential Real Estate Loans
Change in Allowances for Loan Losses [Abstract]
Balance at beginning of period	2,822	[1]	3,277		3,545
Provision (reversal) for loan losses	(284)		(514)		(40)
Distribution of other allowance	0		0		0
Loans charged off	(58)		(22)		(319)
Recoveries of loans charged off	115		81		91
Balance at end of period	2,595		2,822	[1]	3,277
Commercial Real Estate Loans
Change in Allowances for Loan Losses [Abstract]
Balance at beginning of period	3,025	[1]	2,572		2,290
Provision (reversal) for loan losses	1,467		445		10
Distribution of other allowance	0		0		0
Loans charged off	0		0		(67)
Recoveries of loans charged off	85		8		339
Balance at end of period	4,577		3,025	[1]	2,572
Commercial Loans
Change in Allowances for Loan Losses [Abstract]
Balance at beginning of period	3,279	[1]	1,970		3,158
Provision (reversal) for loan losses	3,500		1,204		(909)
Distribution of other allowance	0		0		0
Loans charged off	(336)		(66)		(512)
Recoveries of loans charged off	153		171		233
Balance at end of period	6,596		3,279	[1]	1,970
Municipal Loans
Change in Allowances for Loan Losses [Abstract]
Balance at beginning of period	716	[1]	668		633
Provision (reversal) for loan losses	258		48		35
Distribution of other allowance	0		0		0
Loans charged off	(249)		0		0
Recoveries of loans charged off	0		0		0
Balance at end of period	725		716	[1]	668
Loans to Individuals
Change in Allowances for Loan Losses [Abstract]
Balance at beginning of period	994	[1]	8,248		7,373
Provision (reversal) for loan losses	1,691		13,583		10,073
Distribution of other allowance	0		0		1,231
Loans charged off	(3,688)		(22,461)	[2]	(12,676)
Recoveries of loans charged off	1,896		1,624		2,247
Balance at end of period	893		994	[1]	8,248
Charge-offs related to the write down of SFG loans sold			7,100
Other
Change in Allowances for Loan Losses [Abstract]
Balance at beginning of period	0		0		1,231
Provision (reversal) for loan losses	0		0		0
Distribution of other allowance	0		0		(1,231)
Loans charged off	0		0		0
Recoveries of loans charged off	0		0		0
Balance at end of period	$ 0		$ 0		$ 0
[1]	Loans acquired with the Omni acquisition were measured at fair value on December 17, 2014 with no carryover of allowance for loan loss.
[2]	Of the $22.5 million in charge-offs recorded in the Loans to Individuals category for the year ended December 31, 2014, approximately $7.1 million relate to the write-down of SFG loans to fair value in connection with the sale of the subprime automobile loans that was completed in the fourth quarter 2014.

LOANS AND ALLOWANCE FOR PROBA68

LOANS AND ALLOWANCE FOR PROBABLE LOAN LOSSES - Allowance Balance, by Impairment Method, Reserve (Details) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014		Dec. 31, 2013	Dec. 31, 2012
Schedule of Allowance For Loan Losses, Allowance Balance, by Impairment Method [Line Items]
Ending balance - individually evaluated for impairment	[1]	$ 4,891	$ 530
Ending balance - collectively evaluated for impairment		14,845	12,762
Balance at end of period		19,736	13,292	[2]	$ 18,877	$ 20,585
Loans and Leases Receivable, Allowance		19,736	13,292
Construction Real Estate Loans
Schedule of Allowance For Loan Losses, Allowance Balance, by Impairment Method [Line Items]
Ending balance - individually evaluated for impairment	[1]	12	43
Ending balance - collectively evaluated for impairment		4,338	2,413
Balance at end of period		4,350	2,456	[2]	2,142	2,355
1-4 Family Residential Real Estate Loans
Schedule of Allowance For Loan Losses, Allowance Balance, by Impairment Method [Line Items]
Ending balance - individually evaluated for impairment	[1]	25	102
Ending balance - collectively evaluated for impairment		2,570	2,720
Balance at end of period		2,595	2,822	[2]	3,277	3,545
Commercial Real Estate Loans
Schedule of Allowance For Loan Losses, Allowance Balance, by Impairment Method [Line Items]
Ending balance - individually evaluated for impairment	[1]	137	26
Ending balance - collectively evaluated for impairment		4,440	2,999
Balance at end of period		4,577	3,025	[2]	2,572	2,290
Commercial Loans
Schedule of Allowance For Loan Losses, Allowance Balance, by Impairment Method [Line Items]
Ending balance - individually evaluated for impairment	[1]	4,599	242
Ending balance - collectively evaluated for impairment		1,997	3,037
Balance at end of period		6,596	3,279	[2]	1,970	3,158
Municipal Loans
Schedule of Allowance For Loan Losses, Allowance Balance, by Impairment Method [Line Items]
Ending balance - individually evaluated for impairment	[1]	13	14
Ending balance - collectively evaluated for impairment		712	702
Balance at end of period		725	716	[2]	668	633
Loans to Individuals
Schedule of Allowance For Loan Losses, Allowance Balance, by Impairment Method [Line Items]
Ending balance - individually evaluated for impairment	[1]	105	103
Ending balance - collectively evaluated for impairment		788	891
Balance at end of period		893	994	[2]	8,248	7,373
Other
Schedule of Allowance For Loan Losses, Allowance Balance, by Impairment Method [Line Items]
Balance at end of period		0	0		$ 0	$ 1,231
OmniAmerican Bancorp, Inc.
Schedule of Allowance For Loan Losses, Allowance Balance, by Impairment Method [Line Items]
Loans and Leases Receivable, Allowance		$ 629	$ 0
[1]	Purchase credit impaired (“PCI”) loans were measured at fair value at acquisition and did not have any associated allowance for loan losses as of December 31, 2014. As of December 31, 2015, there was approximately $629,000 of allowance for loan losses associated with PCI loans.
[2]	Loans acquired with the Omni acquisition were measured at fair value on December 17, 2014 with no carryover of allowance for loan loss.

LOANS AND ALLOWANCE FOR PROBA69

LOANS AND ALLOWANCE FOR PROBABLE LOAN LOSSES - Allowance for Loan Losses, Loan Portfolio, by Impairment Method (Details) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
Schedule of Allowance For Loan Losses, Loan Balance, by Impairment Method [Line Items]
Loans individually evaluated for impairment		$ 21,161	$ 9,022
Loans collectively evaluated for impairment		2,391,972	2,150,765	[1]
Purchased Credit Impaired Loans		18,620	21,346	[2]
Total ending loans balance	[3]	2,431,753	2,181,133
Construction Real Estate Loans
Schedule of Allowance For Loan Losses, Loan Balance, by Impairment Method [Line Items]
Loans individually evaluated for impairment		508	2,461
Loans collectively evaluated for impairment		437,518	264,584	[1]
Purchased Credit Impaired Loans		221	785	[2]
Total ending loans balance		438,247	267,830
1-4 Family Residential Real Estate Loans
Schedule of Allowance For Loan Losses, Loan Balance, by Impairment Method [Line Items]
Loans individually evaluated for impairment		1,751	2,936
Loans collectively evaluated for impairment		646,590	680,658	[1]
Purchased Credit Impaired Loans		7,069	7,301	[2]
Total ending loans balance		655,410	690,895
Commercial Real Estate Loans
Schedule of Allowance For Loan Losses, Loan Balance, by Impairment Method [Line Items]
Loans individually evaluated for impairment		3,757	1,605
Loans collectively evaluated for impairment		628,405	463,564	[1]
Purchased Credit Impaired Loans		3,048	3,002	[2]
Total ending loans balance		635,210	468,171
Commercial Loans
Schedule of Allowance For Loan Losses, Loan Balance, by Impairment Method [Line Items]
Loans individually evaluated for impairment		14,250	1,011
Loans collectively evaluated for impairment		220,199	216,272	[1]
Purchased Credit Impaired Loans		8,078	9,177	[2]
Total ending loans balance		242,527	226,460
Municipal Loans
Schedule of Allowance For Loan Losses, Loan Balance, by Impairment Method [Line Items]
Loans individually evaluated for impairment		637	699
Loans collectively evaluated for impairment		287,478	256,793	[1]
Purchased Credit Impaired Loans		0	0	[2]
Total ending loans balance		288,115	257,492
Loans to Individuals
Schedule of Allowance For Loan Losses, Loan Balance, by Impairment Method [Line Items]
Loans individually evaluated for impairment		258	310
Loans collectively evaluated for impairment		171,782	268,894	[1]
Purchased Credit Impaired Loans		204	1,081	[2]
Total ending loans balance		$ 172,244	$ 270,285
[1]	Includes purchased non impaired loans which were measured at fair value at acquisition and did not have an associated allowance for loan loss as of December 31, 2014.
[2]	PCI loans were measured at fair value at acquisition and did not have an associated allowance for loan loss as of December 31, 2014.
[3]	Includes approximately $581.1 million and $763.3 million as of December 31, 2015 and 2014, respectively, of loans acquired with the Omni acquisition on December 17, 2014. These loans were measured at fair value at the acquisition date with no carryover of allowance for loan loss. The allowance for loan loss recorded on acquired loans for the year ended December 31, 2015 totaled $629,000.

LOANS AND ALLOWANCE FOR PROBA70

LOANS AND ALLOWANCE FOR PROBABLE LOAN LOSSES - Loans by Credit Quality Indicator (Details) - USD ($) $ in Thousands		Dec. 31, 2015		Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Purchased Credit Impaired Loans		$ 18,620		$ 21,346	[1]
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance	[2]	2,431,753		2,181,133
Pass
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance		2,360,256		2,118,189
Pass Watch
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance		2,121		5,528
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Purchased Credit Impaired Loans		95		700
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance		6,191	[3]	6,713	[4]
Substandard
Financing Receivable, Recorded Investment [Line Items]
Purchased Credit Impaired Loans		3,600		17,800
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance		50,275	[3]	49,244	[4]
Doubtful
Financing Receivable, Recorded Investment [Line Items]
Purchased Credit Impaired Loans		9,900		0
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance		12,910	[3]	1,459
Construction Real Estate Loans
Financing Receivable, Recorded Investment [Line Items]
Purchased Credit Impaired Loans		221		785	[1]
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance		438,247		267,830
Construction Real Estate Loans | Pass
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance		434,893		260,183
Construction Real Estate Loans | Pass Watch
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance		0		862
Construction Real Estate Loans | Special Mention
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance		1,754		1,394
Construction Real Estate Loans | Substandard
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance		1,576		5,363
Construction Real Estate Loans | Doubtful
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance		24		28
1-4 Family Residential Real Estate Loans
Financing Receivable, Recorded Investment [Line Items]
Purchased Credit Impaired Loans		7,069		7,301	[1]
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance		655,410		690,895
1-4 Family Residential Real Estate Loans | Pass
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance		643,498		677,559
1-4 Family Residential Real Estate Loans | Pass Watch
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance		1,403		1,453
1-4 Family Residential Real Estate Loans | Special Mention
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance		1,636		1,706
1-4 Family Residential Real Estate Loans | Substandard
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance		4,915		9,167
1-4 Family Residential Real Estate Loans | Doubtful
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance		3,958		1,010
Commercial Real Estate Loans
Financing Receivable, Recorded Investment [Line Items]
Purchased Credit Impaired Loans		3,048		3,002	[1]
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance		635,210		468,171
Commercial Real Estate Loans | Pass
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance		620,117		455,394
Commercial Real Estate Loans | Pass Watch
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance		0		2,416
Commercial Real Estate Loans | Special Mention
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance		0		2,569
Commercial Real Estate Loans | Substandard
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance		14,988		7,792
Commercial Real Estate Loans | Doubtful
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance		105		0
Commercial Loans
Financing Receivable, Recorded Investment [Line Items]
Purchased Credit Impaired Loans		8,078		9,177	[1]
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance		242,527		226,460
Commercial Loans | Pass
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance		204,775		199,306
Commercial Loans | Pass Watch
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance		716		781
Commercial Loans | Special Mention
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance		1,738		1,044
Commercial Loans | Substandard
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance		27,681		25,102
Commercial Loans | Doubtful
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance		7,617		227
Municipal Loans
Financing Receivable, Recorded Investment [Line Items]
Purchased Credit Impaired Loans		0		0	[1]
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance		288,115		257,492
Municipal Loans | Pass
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance		286,415		256,543
Municipal Loans | Pass Watch
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance		0		0
Municipal Loans | Special Mention
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance		1,063		0
Municipal Loans | Substandard
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance		637		949
Municipal Loans | Doubtful
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance		0		0
Loans to Individuals
Financing Receivable, Recorded Investment [Line Items]
Purchased Credit Impaired Loans		204		1,081	[1]
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance		172,244		270,285
Loans to Individuals | Pass
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance		170,558		269,204
Loans to Individuals | Pass Watch
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance		2		16
Loans to Individuals | Special Mention
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance		0		0
Loans to Individuals | Substandard
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance		478		871
Loans to Individuals | Doubtful
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance		$ 1,206		$ 194
[1]	PCI loans were measured at fair value at acquisition and did not have an associated allowance for loan loss as of December 31, 2014.
[2]	Includes approximately $581.1 million and $763.3 million as of December 31, 2015 and 2014, respectively, of loans acquired with the Omni acquisition on December 17, 2014. These loans were measured at fair value at the acquisition date with no carryover of allowance for loan loss. The allowance for loan loss recorded on acquired loans for the year ended December 31, 2015 totaled $629,000.
[3]	Includes PCI loans comprised of $95,000 special mention, $3.6 million substandard, and $9.9 million doubtful as of December 31, 2015.
[4]	Includes PCI loans comprised of $0.7 million special mention and $17.8 million substandard as of December 31, 2014.

LOANS AND ALLOWANCE FOR PROBA71

LOANS AND ALLOWANCE FOR PROBABLE LOAN LOSSES - Nonperforming Assets by Asset Class (Details) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
Nonperforming Assets by Asset Class [Abstract]
Nonaccrual loans	[1]	$ 20,526	$ 4,096
Accruing loans past due more than 90 days	[1]	3	4
Restructured loans	[2]	11,143	5,874
Other real estate owned		744	1,738
Repossessed Assets		64	565
Total Nonperforming Assets		32,480	$ 12,277
Purchase Credit Impaired Loan Restructured as TDR		$ 7,500
[1]	Excludes PCI loans measured at fair value at acquisition.
[2]	Includes $7.5 million in PCI loans restructured during the year ended December 31, 2015.

LOANS AND ALLOWANCE FOR PROBA72

LOANS AND ALLOWANCE FOR PROBABLE LOAN LOSSES - Nonaccrual Loans by Class (Details) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	[1]	$ 20,526	$ 4,096
Construction Real Estate Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	[1]	508	716
1-4 Family Residential Real Estate Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	[1]	1,847	2,017
Commercial Real Estate Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	[1]	2,816	675
Commercial Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	[1]	13,896	416
Loans to Individuals
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	[1]	$ 1,459	$ 272
[1]	Excludes PCI loans measured at fair value at acquisition.

LOANS AND ALLOWANCE FOR PROBA73

LOANS AND ALLOWANCE FOR PROBABLE LOAN LOSSES - Impaired Loans by Class of Loan (Details) - USD ($) $ in Thousands	Dec. 31, 2015		Dec. 31, 2014
Impaired Financing Receivable, Recorded Investment [Abstract]
Unpaid contractual principal balance	$ 38,687	[1]	$ 11,010	[2]
Recorded investment with allowance	29,174	[1]	9,940	[2]
Impaired Financing Receivable, Related Allowance	4,891		536	[2]
Purchase Credit Impaired Loans, with Deterioration in Credit Quality After Acquisition	8,000
Construction Real Estate Loans
Impaired Financing Receivable, Recorded Investment [Abstract]
Unpaid contractual principal balance	1,320		3,183
Recorded investment with allowance	508		2,461
Impaired Financing Receivable, Related Allowance	12		43
1-4 Family Residential Real Estate Loans
Impaired Financing Receivable, Recorded Investment [Abstract]
Unpaid contractual principal balance	1,842		4,023
Recorded investment with allowance	1,751		3,854
Impaired Financing Receivable, Related Allowance	25		108
Commercial Real Estate Loans
Impaired Financing Receivable, Recorded Investment [Abstract]
Unpaid contractual principal balance	4,756		1,622
Recorded investment with allowance	4,636		1,605
Impaired Financing Receivable, Related Allowance	137		26
Commercial Loans
Impaired Financing Receivable, Recorded Investment [Abstract]
Unpaid contractual principal balance	29,844		1,162
Recorded investment with allowance	21,385		1,011
Impaired Financing Receivable, Related Allowance	4,599		242
Municipal Loans
Impaired Financing Receivable, Recorded Investment [Abstract]
Unpaid contractual principal balance	637		699
Recorded investment with allowance	637		699
Impaired Financing Receivable, Related Allowance	13		14
Loans to Individuals
Impaired Financing Receivable, Recorded Investment [Abstract]
Unpaid contractual principal balance	288		321
Recorded investment with allowance	257		310
Impaired Financing Receivable, Related Allowance	$ 105		$ 103
[1]	Includes of $8.0 million of PCI loans that experienced deterioration in credit quality subsequent to the acquisition date.
[2]	PCI loans are excluded from this table as there was no evidence of further deterioration in credit quality as of December 31, 2014 that would indicate it was probable that our recorded investment in these loans would not be recoverable.

LOANS AND ALLOWANCE FOR PROBA74

LOANS AND ALLOWANCE FOR PROBABLE LOAN LOSSES - Aging of Past Due Loans By Class of Loan (Details) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		$ 12,510	$ 10,569
Current	[1]	2,419,243	2,170,564
Total ending loans balance	[2]	2,431,753	2,181,133
Construction Real Estate Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		587	1,134
Current	[1]	437,660	266,696
Total ending loans balance		438,247	267,830
1-4 Family Residential Real Estate Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		5,564	6,037
Current	[1]	649,846	684,858
Total ending loans balance		655,410	690,895
Commercial Real Estate Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		2,009	1,878
Current	[1]	633,201	466,293
Total ending loans balance		635,210	468,171
Commercial Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		1,000	816
Current	[1]	241,527	225,644
Total ending loans balance		242,527	226,460
Municipal Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		0	0
Current	[1]	288,115	257,492
Total ending loans balance		288,115	257,492
Loans to Individuals
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		3,350	704
Current	[1]	168,894	269,581
Total ending loans balance		172,244	270,285
Financing Receivables, 30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		7,167	5,849
Financing Receivables, 30 to 59 Days Past Due | Construction Real Estate Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		121	376
Financing Receivables, 30 to 59 Days Past Due | 1-4 Family Residential Real Estate Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		3,703	3,511
Financing Receivables, 30 to 59 Days Past Due | Commercial Real Estate Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		359	1,203
Financing Receivables, 30 to 59 Days Past Due | Commercial Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		527	397
Financing Receivables, 30 to 59 Days Past Due | Municipal Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		0	0
Financing Receivables, 30 to 59 Days Past Due | Loans to Individuals
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		2,457	362
Financing Receivables, 60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		3,074	620
Financing Receivables, 60 to 89 Days Past Due | Construction Real Estate Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		258	42
Financing Receivables, 60 to 89 Days Past Due | 1-4 Family Residential Real Estate Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		781	509
Financing Receivables, 60 to 89 Days Past Due | Commercial Real Estate Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		1,289	0
Financing Receivables, 60 to 89 Days Past Due | Commercial Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		138	3
Financing Receivables, 60 to 89 Days Past Due | Municipal Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		0	0
Financing Receivables, 60 to 89 Days Past Due | Loans to Individuals
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		608	66
Financing Receivables, Equal to Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		2,269	4,100
Financing Receivables, Equal to Greater than 90 Days Past Due | Construction Real Estate Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		208	716
Financing Receivables, Equal to Greater than 90 Days Past Due | 1-4 Family Residential Real Estate Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		1,080	2,017
Financing Receivables, Equal to Greater than 90 Days Past Due | Commercial Real Estate Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		361	675
Financing Receivables, Equal to Greater than 90 Days Past Due | Commercial Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		335	416
Financing Receivables, Equal to Greater than 90 Days Past Due | Municipal Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		0	0
Financing Receivables, Equal to Greater than 90 Days Past Due | Loans to Individuals
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		$ 285	$ 276
[1]	Includes PCI loans measured at fair value.
[2]	Includes approximately $581.1 million and $763.3 million as of December 31, 2015 and 2014, respectively, of loans acquired with the Omni acquisition on December 17, 2014. These loans were measured at fair value at the acquisition date with no carryover of allowance for loan loss. The allowance for loan loss recorded on acquired loans for the year ended December 31, 2015 totaled $629,000.

LOANS AND ALLOWANCE FOR PROBA75

LOANS AND ALLOWANCE FOR PROBABLE LOAN LOSSES - Interest Income on Impaired Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	[1]	Dec. 31, 2014	[1]	Dec. 31, 2013
Impaired Financing Receivable, Average Recorded Investment and Interest [Abstract]
Average recorded investment	$ 23,607		$ 10,986		$ 11,970
Interest income recognized	422		193		632
Construction Real Estate Loans
Impaired Financing Receivable, Average Recorded Investment and Interest [Abstract]
Average recorded investment	1,518		1,346		1,707
Interest income recognized	0		4		0
1-4 Family Residential Real Estate Loans
Impaired Financing Receivable, Average Recorded Investment and Interest [Abstract]
Average recorded investment	3,410		3,511		2,915
Interest income recognized	61		67		76
Commercial Real Estate Loans
Impaired Financing Receivable, Average Recorded Investment and Interest [Abstract]
Average recorded investment	3,323		2,173		1,972
Interest income recognized	64		52		72
Commercial Loans
Impaired Financing Receivable, Average Recorded Investment and Interest [Abstract]
Average recorded investment	13,807		1,286		1,935
Interest income recognized	256		26		19
Municipal Loans
Impaired Financing Receivable, Average Recorded Investment and Interest [Abstract]
Average recorded investment	824		750		292
Interest income recognized	37		41		16
Loans to Individuals
Impaired Financing Receivable, Average Recorded Investment and Interest [Abstract]
Average recorded investment	725		1,920		3,149
Interest income recognized	$ 4		$ 3		$ 449
[1]	Excludes PCI loans measured at fair value at acquisition that have not experienced further deterioration in credit quality subsequent to the acquisition date.

LOANS AND ALLOWANCE FOR PROBA76

LOANS AND ALLOWANCE FOR PROBABLE LOAN LOSSES - Troubled Debt Restructurings (Details) $ in Thousands		12 Months Ended
		Dec. 31, 2015USD ($)contract	Dec. 31, 2014USD ($)contract
Troubled Debt Restructuring [Abstract]
Extend Amortization Period		$ 13,747	$ 2,600
Interest Rate Reduction		80	290
Loan modification related to more than one restructuring type	[1]	9,182	1,005
Total modifications		$ 23,009	$ 3,895
Number of contracts | contract		33	21
Construction Real Estate Loans
Troubled Debt Restructuring [Abstract]
Extend Amortization Period		$ 0	$ 1,746
Interest Rate Reduction		0	0
Loan modification related to more than one restructuring type	[1]	0	0
Total modifications		$ 0	$ 1,746
Number of contracts | contract		0	1
1-4 Family Residential Real Estate Loans
Troubled Debt Restructuring [Abstract]
Extend Amortization Period		$ 0	$ 0
Interest Rate Reduction		80	280
Loan modification related to more than one restructuring type	[1]	255	374
Total modifications		$ 335	$ 654
Number of contracts | contract		3	3
Commercial Real Estate Loans
Troubled Debt Restructuring [Abstract]
Extend Amortization Period		$ 438	$ 558
Interest Rate Reduction		0	0
Loan modification related to more than one restructuring type	[1]	1,290	391
Total modifications		$ 1,728	$ 949
Number of contracts | contract		4	3
Commercial Loans
Troubled Debt Restructuring [Abstract]
Extend Amortization Period		$ 13,249	$ 291
Interest Rate Reduction		0	0
Loan modification related to more than one restructuring type	[1]	7,507	172
Total modifications		$ 20,756	$ 463
Number of contracts | contract		12	6
Loans to Individuals
Troubled Debt Restructuring [Abstract]
Extend Amortization Period		$ 60	$ 5
Interest Rate Reduction		0	10
Loan modification related to more than one restructuring type	[1]	130	68
Total modifications		$ 190	$ 83
Number of contracts | contract		14	8
[1]	These modifications may include an extension of the amortization period, interest rate reduction, and/or converting the loan to interest-only for a limited period of time.

LOANS AND ALLOWANCE FOR PROBA77

LOANS AND ALLOWANCE FOR PROBABLE LOAN LOSSES - Purchased Credit Impaired (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Purchased Credit Impaired [Abstract]
Outstanding principal balance	$ 27,644	$ 32,572
Carrying amount	18,620	21,346	[1]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance at beginning of period	1,820	0
Additions	0	0
Additions due to acquisition	0	1,898
Reclassifications from Nonaccretable Difference	2,739	0
Accretion	(2,066)	(78)
Balance at end of period	$ 2,493	$ 1,820
[1]	PCI loans were measured at fair value at acquisition and did not have an associated allowance for loan loss as of December 31, 2014.

LOANS AND ALLOWANCE FOR PROBA78

LOANS AND ALLOWANCE FOR PROBABLE LOAN LOSSES - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]
Loans to related parties	$ 8,100,000	$ 7,100,000	$ 5,500,000
Related party loans as a percent of stockholders' equity	1.80%	1.70%	2.10%
Commercial Real Estate, Commercial Real Estate	$ 583,400,000
Commercial Real Estate, Multifamily	46,800,000
Commercial Real Estate, Farm Land	5,000,000
Financing Receivable, Significant Purchases	0
Financing Receivable, Significant Sales		$ 70,300,000
Loan review larger dollar loan relationship scope, aggregate debt	500,000
Specifically reserved loans or loan relationships threshold	150,000
Loans in Process of Foreclosure	67,000
Nonaccrual impaired commercial loan restructured as TDR	12,400,000
Purchase Credit Impaired Loan Restructured as TDR	7,500,000
Additional allowance provision due to PCI restructured loan	633,000
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	627,000	0
Loans and leases receivable, impaired, commitment to lend	$ 0	$ 0

PREMISES AND EQUIPMENT (Details

PREMISES AND EQUIPMENT (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Abstract]
Premises	$ 124,626	$ 121,740
Furniture and equipment	35,069	36,045
Premises and equipment, gross	159,695	157,785
Less: accumulated depreciation	51,766	44,925
Premises and equipment, net	107,929	112,860
Depreciation [Abstract]
Accumulated depreciation of assets written off	1,200	614
Depreciation expense	$ 8,100	$ 3,300	$ 3,700

DEPOSITS - Types and Component

DEPOSITS - Types and Components of Deposit Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Noninterest bearing demand deposits:
Noninterest bearing demand deposits	$ 672,470	$ 661,014
Interest bearing deposits:
Total interest bearing deposits	2,782,937	2,713,403
Total deposits	3,455,407	3,374,417
Private accounts
Noninterest bearing demand deposits:
Noninterest bearing demand deposits	651,992	640,450
Interest bearing deposits:
Savings deposits	233,157	226,267
Money market demand deposits	341,432	379,149
Platinum money market deposits	323,526	291,473
Interest bearing checking	177,409	11,863
NOW demand deposits	253,041	409,737
Certificates and other time deposits of $250,000 or more	57,209	60,408
Certificates and other time deposits under $250,000	498,901	493,125
Total interest bearing deposits	1,884,675	1,872,022
Public accounts
Noninterest bearing demand deposits:
Noninterest bearing demand deposits	20,478	20,564
Interest bearing deposits:
Savings deposits	15	9
Money market demand deposits	22,518	22,656
Platinum money market deposits	383,716	398,333
Interest bearing checking	6,679	35
NOW demand deposits	151,974	132,909
Certificates and other time deposits of $250,000 or more	311,824	268,302
Certificates and other time deposits under $250,000	21,536	19,137
Total interest bearing deposits	$ 898,262	$ 841,381

DEPOSITS - Scheduled Maturitie

DEPOSITS - Scheduled Maturities of Time Deposits (Details) $ in Thousands	Dec. 31, 2015USD ($)
Time Deposits, Fiscal Year Maturity [Abstract]
2,016	$ 501,440
2,017	160,560
2,018	136,379
2,019	47,368
2,020	37,875
2021 and thereafter	5,848
Total	$ 889,470

DEPOSITS - Narrative (Details)

DEPOSITS - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Deposit Liabilities Disclosures [Line Items]
Interest expense on time deposits of $250,000 or more	$ 1,400,000	$ 1,100,000	$ 1,400,000
Related Party Deposit Liabilities	11,600,000	10,700,000
Demand deposit overdrafts reclassified as loans	637,000	2,800,000
Certificates of deposit - CDs
Deposit Liabilities Disclosures [Line Items]
Brokered certificates of deposit	$ 85,300,000	$ 23,400,000
Brokered certificates of deposit, as a percent of total deposits	2.50%
Category under which brokered certificates of deposit are reported	$ 250,000
Maximum brokered certificates of deposit balance allowed per company policy	180,000,000
Non-Callable | Certificates of deposit - CDs
Deposit Liabilities Disclosures [Line Items]
Interest-bearing Domestic Deposit, Brokered, Non-Callable	$ 64,600,000
Weighted Average Rate Domestic Deposit, Brokered	5600.00%
Non-Callable | Minimum
Deposit Liabilities Disclosures [Line Items]
Brokered certificates of deposit, maturity period	5 months
Non-Callable | Maximum
Deposit Liabilities Disclosures [Line Items]
Brokered certificates of deposit, maturity period	13 months
Callable | Certificates of deposit - CDs
Deposit Liabilities Disclosures [Line Items]
Brokered certificates of deposit, maturity period	5 years
Interest-bearing Domestic Deposit, Brokered, Long-Term with Company Controlled Short-Term Calls	$ 20,700,000

SHORT-TERM BORROWINGS - Short-

SHORT-TERM BORROWINGS - Short-term Borrowings by Type of Debt (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014
Short-term Debt [Line Items]
Balance at end of period		$ 647,836	$ 301,605
Federal funds purchased and repurchase agreements
Short-term Debt [Line Items]
Balance at end of period		2,429	4,237
Average amount outstanding during the period	[1]	2,277	1,886
Maximum amount outstanding during the period	[2]	$ 2,429	$ 4,237
Weighted average interest rate during the period	[3]	0.10%	0.20%
Interest rate at end of period		0.10%	1.40%
FHLB advances
Short-term Debt [Line Items]
Balance at end of period		$ 645,407	$ 297,368
Average amount outstanding during the period	[1]	382,417	62,240
Maximum amount outstanding during the period	[2]	$ 656,431	$ 297,368
Weighted average interest rate during the period	[3]	0.30%	0.90%
Interest rate at end of period		0.50%	0.40%
[1]	The average amount outstanding during the period was computed by dividing the total daily outstanding principal balances by the number of days in the period.
[2]	The maximum amount outstanding at any month-end during the period.
[3]	The weighted average interest rate during the period was computed by dividing the actual interest expense by the average balance outstanding during the period.

SHORT-TERM BORROWINGS - Lines

SHORT-TERM BORROWINGS - Lines of Credit (Details)	Dec. 31, 2015USD ($)credit_lineOustanding_Letters_of_Credit	Dec. 31, 2014USD ($)
Line of Credit Facility [Line Items]
Number of credit lines maintained by the Company | credit_line	3
Number of outstanding letters of credit | Oustanding_Letters_of_Credit	1
Letters of Credit Outstanding, Amount	$ 195,000
Additional funding the Company could obtain from FHLB using unpledged securities (less required FHLB stock purchases)	606,900,000
Federal funds purchased	0	$ 0
Letters of Credit, FHLB, as Collateral	0
Frost Bank
Line of Credit Facility [Line Items]
Line of credit, maximum borrowing capacity	30,000,000
Line of credit facility, capacity available for issuance of letters of credit	5,000,000
TIB - The Independent Bankers Bank
Line of Credit Facility [Line Items]
Line of credit, maximum borrowing capacity	15,000,000
Comerica Bank
Line of Credit Facility [Line Items]
Line of credit, maximum borrowing capacity	$ 7,500,000

SHORT-TERM BORROWINGS - Securi

SHORT-TERM BORROWINGS - Securities Sold Under Agreements to Repurchase (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Securities Sold under Agreements to Repurchase [Line Items]
Securities sold under agreements to repurchase	$ 2.4	$ 4.2
Maturity of repurchase agreements	1 year

LONG-TERM OBLIGATIONS - Long-t

LONG-TERM OBLIGATIONS - Long-term Borrowings by Type of Debt (Details) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
FHLB advances		$ 502,281	$ 600,052
Long-term debt		60,311	60,311
FHLB advances
Debt Instrument [Line Items]
FHLB advances		$ 502,281	$ 600,052
Weighted average interest rate during the period	[1]	1.30%	1.40%
Interest rate at end of period		1.30%	1.30%
Long-term debt
Debt Instrument [Line Items]
Long-term debt	[2]	$ 60,311	$ 60,311
Weighted average interest rate during the period	[1],[2]	2.40%	2.40%
Interest rate at end of period	[2]	2.60%	2.30%
[1]	The weighted average interest rate during the period was computed by dividing the actual interest expense by the average balance outstanding during the period.
[2]	This long-term debt consists of trust preferred securities that qualify under the risk-based capital guidelines as Tier 1 capital, subject to certain limitations.

LONG-TERM OBLIGATIONS - Maturi

LONG-TERM OBLIGATIONS - Maturities of Fixed Rate Long-term Obligations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Long-term Debt, Fiscal Year Maturity [Abstract]
2,016	$ 1,093
2,017	288,808
2,018	78,288
2,019	42,348
2,020	76,016
Thereafter	76,039
Total long-term obligations	562,592	$ 660,363
FHLB advances
Long-term Debt, Fiscal Year Maturity [Abstract]
2,016	1,093
2,017	288,808
2,018	78,288
2,019	42,348
2,020	76,016
Thereafter	15,728
Total long-term obligations	502,281
Long-term debt
Long-term Debt, Fiscal Year Maturity [Abstract]
2,016	0
2,017	0
2,018	0
2,019	0
2,020	0
Thereafter	60,311
Total long-term obligations	$ 60,311
Maximum
Debt Instrument [Line Items]
Maturity range of FHLB advances	13 years
Fixed interest rate on FHLB advances, range to	5.00%
Minimum
Debt Instrument [Line Items]
Maturity range of FHLB advances	1 year
Fixed interest rate on FHLB advances, range from	0.80%

LONG-TERM OBLIGATIONS - Intere

LONG-TERM OBLIGATIONS - Interest Rate Swap (Details) - Interest Rate Swap [Member]	12 Months Ended
	Dec. 31, 2015Rate
Derivative [Line Items]
Derivative, Description of Hedged Item	$20.0 million variable rate advance agreement with FHLB
Debt Instrument, Description of Variable Rate Basis	one-month LIBOR
Debt Instrument, Basis Spread on Variable Rate	0.17%
Derivative, Description of Objective	Company entered into an interest rate swap contract that is treated as a cash flow hedge under ASC 815 that effectively converted the variable rate advance to a fixed interest rate
Derivative, Fixed Interest Rate	1.529%
Derivative, Term of Contract	5 years

LONG-TERM OBLIGATIONS - Other

LONG-TERM OBLIGATIONS - Other Long-term Debt by Type of Trust (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Long-term debt	$ 60,311	$ 60,311
Southside Statutory Trust III
Debt Instrument [Line Items]
Long-term debt	$ 20,619	20,619
Debt maturity dates	2,033
Adjusted rate of debt	3.5467%
Date of interest rate adjustment	Mar. 30, 2016
Debt Instrument, Description of Variable Rate Basis	three-month LIBOR
Basis spread on variable rate	2.94%
Southside Statutory Trust IV
Debt Instrument [Line Items]
Long-term debt	$ 23,196	23,196
Debt maturity dates	2,037
Adjusted rate of debt	1.6219%
Date of interest rate adjustment	Jan. 29, 2016
Long-term Debt, Percentage Bearing Variable Interest, Future Percentage Rate	1.9156%
Future Date of interest rate adjustment	Apr. 29, 2016
Debt Instrument, Description of Variable Rate Basis	three-month LIBOR
Basis spread on variable rate	1.30%
Southside Statutory Trust V
Debt Instrument [Line Items]
Long-term debt	$ 12,887	12,887
Debt maturity dates	2,037
Adjusted rate of debt	2.762%
Date of interest rate adjustment	Mar. 14, 2016
Debt Instrument, Description of Variable Rate Basis	three-month LIBOR
Basis spread on variable rate	2.25%
Magnolia Trust Company I
Debt Instrument [Line Items]
Long-term debt	$ 3,609	$ 3,609
Debt maturity dates	2,035
Adjusted rate of debt	2.1776%
Date of interest rate adjustment	Feb. 22, 2016
Long-term Debt, Percentage Bearing Variable Interest, Future Percentage Rate	2.4182%
Future Date of interest rate adjustment	May 22, 2016
Debt Instrument, Description of Variable Rate Basis	three-month LIBOR
Basis spread on variable rate	1.80%

EMPLOYEE BENEFITS - Narrative

EMPLOYEE BENEFITS - Narrative (Details)		Dec. 17, 2014USD ($)	Dec. 31, 2015USD ($)executive_officershares	Dec. 31, 2014USD ($)shares	Dec. 31, 2013USD ($)shares	Feb. 29, 2016executive_officer
Health Insurance Coverage [Abstract]
Cost of health care benefits			$ 6,000,000	$ 4,600,000	$ 4,000,000
Health coverage eligibility for retiring employees, minimum years of service			50 years
Retirees participating in health insurance			2	0	0
Employee Stock Ownership Plan (ESOP) [Abstract]
Contributions to the employee stock ownership plan (ESOP)			$ 350,000	$ 250,000	$ 250,000
Shares owned by the ESOP | shares			310,646	351,936
Supplemental Unemployment Benefits [Abstract]
Long-term disability coverage, minimum years of service rendered for officers to automatically qualify			3 years
Long-term disability coverage, minimum annual salary level for officers to automatically qualify			$ 50,000
Long-term disability coverage, maximum benefit provided, as a ratio of final salary			0.667%
Long-term disability coverage, maximum benefit provided, per month			$ 15,000
Split Dollar Life Insurance Agreements [Abstract]
Total split dollar liability			$ 95,080,000	$ 92,384,000
401(k) [Abstract]
Defined Contribution Plan, Requisite Service Period			1 year
401(k) Plan, minimum eligibility age			21 years
401(k) Plan expense			$ 447,000	$ 171,000	227,000
Defined Benefit Pension Plan
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]
Defined benefit pension plan, minimum eligibility age			65 years
Early retirement election at reduced benefit levels, minimum eligibility age			55 years
Number of shares of Company stock included in plan assets | shares			223,615	223,615
Funded (under funded) status			$ (3,685,000)	$ (4,320,000)	8,944,000
Special and contractual termination benefits			$ 176,000	0	0
Defined Benefit Plan, Description of Nature of Event Resulting in Special or Contractual Termination Benefits Recognized During Period			we offered an early retirement package
Defined Benefit, Special Termination Benefits, Number of Employees Offered Early Retirement			24
Defined Benefit Plan, Special Termination Benefits, Number of Employees that Accepted Early Retirement Offer			16
Defined Benefit Plan, Special Termination Benefits, Early Retirement Offer Deadline			Jan. 29, 2016
Expected contributions to defined benefit plan 2016			$ 3,000,000
Defined Benefit Pension Plan Acquired
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]
Funded (under funded) status	[1]		(945,000)	(1,465,000)
Special and contractual termination benefits			0	0
Expected contributions to defined benefit plan 2016			0
Restoration Plan
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]
Funded (under funded) status			(12,024,000)	(13,259,000)	(10,848,000)
Special and contractual termination benefits			0	$ 0	$ 0
Expected contributions to defined benefit plan 2016			$ 258,000
Other Equity Securities | Defined Benefit Pension Plan
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]
Target plan asset allocations			55.00%
Fixed Income Securities | Defined Benefit Pension Plan
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]
Target plan asset allocations			44.50%
Cash equivalents | Defined Benefit Pension Plan
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]
Target plan asset allocations			0.50%
Incentive Plan 2009
Share-based Compensation [Abstract]
Common stock shares reserved and available for issuance (in shares) | shares			1,407,103
Nonvested awards outstanding (in shares) | shares			520,756	244,147	437,578
Share-based compensation expense			$ 1,400,000	$ 1,100,000	$ 911,000
Tax benefit from share-based compensation expense			488,000	379,000	319,000
Unrecognized compensation expense			$ 4,000,000	$ 1,800,000	$ 3,200,000
Unrecognized compensation, weighted-average period for recognition			2 years 10 months 30 days
Stock compensation issued from available authorized shares (in shares) | shares			28,651	88,908	33,802
Tax (benefit) expense realized for deductions related to stock option exercises			$ (75,000)	$ 76,000	$ (65,000)
Incentive Plan 2009 | Nonqualified Stock Options (NQSOs)
Share-based Compensation [Abstract]
Awards contractual term			10 years
Total intrinsic value of outstanding stock options			$ 1,700,000
Total intrinsic value of exercisable stock options			1,500,000
Total intrinsic value of stock options exercised during period			119,000	1,000,000	97,000
Cash received from exercise of stock options			$ 236,000	1,200,000	206,000
Incentive Plan 2009 | Nonqualified Stock Options (NQSOs) | Minimum
Share-based Compensation [Abstract]
Awards vesting period			3 years
Incentive Plan 2009 | Nonqualified Stock Options (NQSOs) | Maximum
Share-based Compensation [Abstract]
Awards vesting period			4 years
Incentive Plan 2009 | Restricted Stock Units (RSUs) | Minimum
Share-based Compensation [Abstract]
Awards vesting period			3 years
Incentive Plan 2009 | Restricted Stock Units (RSUs) | Maximum
Share-based Compensation [Abstract]
Awards vesting period			4 years
Executive officers
Deferred Compensation Arrangements [Abstract]
Number of employees included in the deferred compensation agreement with the Company | executive_officer			17
Aggregate payment amount provided in the deferred compensation agreements			$ 6,100,000
Maximum benefit period after retirement or death			15 years
Number of individuals receiving payments | executive_officer			5
Number of individuals eligible for retirement | executive_officer			1
Deferred Compensation Agreements, Number of Individuals That Accepted the Retirement Package | executive_officer			3
Deferred compensation expense			$ 553,000	224,000	589,000
Total deferred compensation plan liability			$ 3,900,000	3,800,000
Split Dollar Life Insurance Agreements [Abstract]
Number of employees covered by the split dollar agreements | executive_officer			8
Aggregate death benefit amount provided in agreement, before inflation adjustment			$ 4,500,000
Bank Owned Life Insurance, Death Benefits Paid During the Period					1,100,000
Aggregate death benefits, inflation adjusted			5,000,000
Expense of split dollar retirement bonus			28,000	7,000	$ 26,000
Total split dollar liability			$ 1,900,000	$ 1,600,000
Executive officers | Minimum
Split Dollar Life Insurance Agreements [Abstract]
Inflation adjustment factor applied to benefits, annual			3.00%
Executive officers | Maximum
Split Dollar Life Insurance Agreements [Abstract]
Inflation adjustment factor applied to benefits, annual			5.00%
OmniAmerican Bancorp, Inc.
Share-based Compensation [Abstract]
Share-based compensation expense	[2]	$ 8,874,000
Subsequent Event | Executive officers
Deferred Compensation Arrangements [Abstract]
Number of individuals eligible for retirement | executive_officer						3
[1]	Defined benefit plan acquired with the acquisition of Omni on December 17, 2014.
[2]	In connection with the merger, we recorded the unvested stock options and the non-vested restricted stock awards as a post-combination expense.

EMPLOYEE BENEFITS - Change in

EMPLOYEE BENEFITS - Change in Projected Benefit Obligation and Plan Assets (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013
Defined Benefit Pension Plan
Change in Projected Benefit Obligation:
Benefit obligation at end of prior year		$ 84,050		$ 70,046		$ 78,002
Service cost		1,838		1,697		2,118
Interest cost		3,410		3,497		3,155
Actuarial (gain) loss		(6,777)		13,146		(11,642)
Benefits paid		(2,590)		(4,118)		(1,776)
Expenses paid		(67)		(175)		(111)
Plan acquired through acquisition		0		0		0
Plan Amendments		0		(43)		300
Settlements		0		0		0
Special and contractual termination benefits		176		0		0
Benefit obligation at end of year		80,040		84,050		70,046
Change in Plan Assets:
Fair value of plan assets at end of prior year		79,730		78,990		63,165
Actual return		(718)		5,033		12,712
Employer contributions		0		0		5,000
Benefits paid		(2,590)		(4,118)		(1,776)
Expenses paid		(67)		(175)		(111)
Settlements		0		0		0
Plan acquired through acquisition		0		0		0
Fair value of plan assets at end of year		76,355		79,730		78,990
(Un)Funded status at end of year		(3,685)		(4,320)		8,944
Accrued benefit (liability) asset recognized		(3,685)		(4,320)		8,944
Accumulated benefit obligation at end of year		69,737		71,201		57,283
Defined Benefit Pension Plan Acquired
Change in Projected Benefit Obligation:
Benefit obligation at end of prior year	[1]	5,977		0
Service cost		0	[1]	0	[1]	0
Interest cost		238	[1]	0	[1]	0
Actuarial (gain) loss	[1]	(753)		0
Benefits paid	[1]	(28)		0
Expenses paid	[1]	(30)		0
Plan acquired through acquisition	[1]	0		5,977
Plan Amendments	[1]	0		0
Settlements	[1]	(719)		0
Special and contractual termination benefits		0		0
Benefit obligation at end of year		4,685		5,977	[1]	0	[1]
Change in Plan Assets:
Fair value of plan assets at end of prior year	[1]	4,512		0
Actual return	[1]	5		0
Employer contributions	[1]	0		0
Benefits paid	[1]	(28)		0
Expenses paid	[1]	(30)		0
Settlements	[1]	(719)		0
Plan acquired through acquisition	[1]	0		4,512
Fair value of plan assets at end of year	[1]	3,740		4,512		0
(Un)Funded status at end of year	[1]	(945)		(1,465)
Accrued benefit (liability) asset recognized	[1]	(945)		(1,465)
Accumulated benefit obligation at end of year	[1]	4,685		5,977
Restoration Plan
Change in Projected Benefit Obligation:
Benefit obligation at end of prior year		13,259		10,848		9,801
Service cost		334		275		298
Interest cost		668		563		468
Actuarial (gain) loss		(1,968)		1,813		344
Benefits paid		(269)		(240)		(120)
Expenses paid		0		0		0
Plan acquired through acquisition		0		0		0
Plan Amendments		0		0		57
Settlements		0		0		0
Special and contractual termination benefits		0		0		0
Benefit obligation at end of year		12,024		13,259		10,848
Change in Plan Assets:
Fair value of plan assets at end of prior year		0		0		0
Actual return		0		0		0
Employer contributions		269		240		120
Benefits paid		(269)		(240)		(120)
Expenses paid		0		0		0
Settlements		0		0		0
Plan acquired through acquisition		0		0		0
Fair value of plan assets at end of year		0		0		0
(Un)Funded status at end of year		(12,024)		(13,259)		(10,848)
Accrued benefit (liability) asset recognized		(12,024)		(13,259)		(10,848)
Accumulated benefit obligation at end of year		$ 10,290		$ 10,811		$ 8,088
[1]	Defined benefit plan acquired with the acquisition of Omni on December 17, 2014.

EMPLOYEE BENEFITS - Amounts Re

EMPLOYEE BENEFITS - Amounts Recognized as a Component of Other Comprehensive Income (loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Recognition of net loss	$ (2,448)	$ (1,042)	$ (2,787)
Recognition of prior service (credit) cost	16	14	43
Net prior service credit (cost) occurring during the year	0	(43)	357
Defined Benefit Pension Plan
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Recognition of net loss	1,505	543	2,197
Recognition of prior service (credit) cost	(23)	(19)	(42)
Recognition of gain due to settlements	0	0	0
Net gain (loss) occurring during the year	375	(13,761)	19,559
Net prior service credit (cost) occurring during the year	0	43	(300)
Total adjustment during the year	1,857	(13,194)	21,414
Deferred tax (expense) benefit	(650)	4,618	(7,495)
Other comprehensive income (loss), net of tax	1,207	(8,576)	13,919
Defined Benefit Pension Plan Acquired
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Recognition of net loss	0
Recognition of prior service (credit) cost	0
Recognition of gain due to settlements	(62)	0	0
Net gain (loss) occurring during the year	463
Net prior service credit (cost) occurring during the year	0
Total adjustment during the year	401
Deferred tax (expense) benefit	(141)
Other comprehensive income (loss), net of tax	260
Restoration Plan
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Recognition of net loss	943	499	590
Recognition of prior service (credit) cost	7	5	(1)
Recognition of gain due to settlements	0	0	0
Net gain (loss) occurring during the year	1,968	(1,813)	(344)
Net prior service credit (cost) occurring during the year	0	0	(57)
Total adjustment during the year	2,918	(1,309)	188
Deferred tax (expense) benefit	(1,021)	458	(66)
Other comprehensive income (loss), net of tax	$ 1,897	$ (851)	$ 122

EMPLOYEE BENEFITS - Amounts in

EMPLOYEE BENEFITS - Amounts in Accumulated Other Comprehensive Income (Loss) Recognized in Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Net loss	$ (2,448)	$ (1,042)	$ (2,787)
Prior service (credit) cost	16	14	43
Defined Benefit Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Net loss	1,505	543	2,197
Prior service (credit) cost	(23)	(19)	(42)
Gain recognized due to settlement	0	0	0
Total amount in other comprehensive income recognized in net periodic benefit cost, before tax	1,482	524
Deferred tax (expense) benefit	(519)	(183)
Accumulated other comprehensive income (loss), net of tax	963	341
Defined Benefit Pension Plan Acquired
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Net loss	0
Prior service (credit) cost	0
Gain recognized due to settlement	(62)	0	0
Total amount in other comprehensive income recognized in net periodic benefit cost, before tax	(62)
Deferred tax (expense) benefit	22
Accumulated other comprehensive income (loss), net of tax	(40)
Restoration Plan
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Net loss	943	499	590
Prior service (credit) cost	7	5	(1)
Gain recognized due to settlement	0	0	$ 0
Total amount in other comprehensive income recognized in net periodic benefit cost, before tax	950	504
Deferred tax (expense) benefit	(333)	(176)
Accumulated other comprehensive income (loss), net of tax	$ 617	$ 328

EMPLOYEE BENEFITS - Amounts 94

EMPLOYEE BENEFITS - Amounts Recognized as a Component of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Pension Plan
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]
Net (loss) gain	$ (25,956)	$ (27,836)
Prior service credit (cost)	40	62
Accumulated other comprehensive (loss) income, before tax	(25,916)	(27,774)
Deferred tax benefit	9,071	9,721
Accumulated other comprehensive (loss) income, net of tax	(16,845)	(18,053)
Defined Benefit Pension Plan Acquired
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]
Net (loss) gain	401
Prior service credit (cost)	0
Accumulated other comprehensive (loss) income, before tax	401
Deferred tax benefit	(141)
Accumulated other comprehensive (loss) income, net of tax	260
Restoration Plan
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]
Net (loss) gain	(2,816)	(5,727)
Prior service credit (cost)	(44)	(50)
Accumulated other comprehensive (loss) income, before tax	(2,860)	(5,777)
Deferred tax benefit	1,001	2,022
Accumulated other comprehensive (loss) income, net of tax	$ (1,859)	$ (3,755)

EMPLOYEE BENEFITS - Net Period

EMPLOYEE BENEFITS - Net Periodic Benefit Cost and Postretirement Benefit Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013
Defined Benefit Pension Plan
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	$ 1,838		$ 1,697		$ 2,118
Interest cost	3,410		3,497		3,155
Expected return on assets	(5,684)		(5,648)		(4,795)
Net loss amortization	1,505		543		2,197
Prior service credit amortization	(23)		(19)		(42)
Special and contractual termination benefits	176		0		0
Gain recognized due to settlement	0		0		0
Net periodic benefit cost	1,222		70		2,633
Restoration Plan
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	334		275		298
Interest cost	668		563		468
Net loss amortization	943		499		590
Prior service credit amortization	7		5		(1)
Special and contractual termination benefits	0		0		0
Gain recognized due to settlement	0		0		0
Net periodic benefit cost	1,952		1,342		1,355
Defined Benefit Pension Plan Acquired
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	0	[1]	0	[1]	0
Interest cost	238	[1]	0	[1]	0
Expected return on assets	(294)		0		0
Net loss amortization	0		0		0
Prior service credit amortization	0		0		0
Special and contractual termination benefits	0		0
Gain recognized due to settlement	(62)		0		0
Net periodic benefit cost	$ (118)		$ 0		$ 0
[1]	Defined benefit plan acquired with the acquisition of Omni on December 17, 2014.

EMPLOYEE BENEFITS - Amounts th

EMPLOYEE BENEFITS - Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in next fiscal year (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)
Defined Benefit Pension Plan
Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in 2016 [Abstract]
Net loss	$ 1,408
Prior service (credit) cost	(23)
Total amount that will be amortized from accumulated other comprehensive income	1,385
Deferred tax benefit	(485)
Accumulated other comprehensive loss, net of tax	900
Defined Benefit Pension Plan Acquired
Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in 2016 [Abstract]
Net loss	0
Prior service (credit) cost	0
Total amount that will be amortized from accumulated other comprehensive income	0
Deferred tax benefit	0
Accumulated other comprehensive loss, net of tax	0
Restoration Plan
Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in 2016 [Abstract]
Net loss	214
Prior service (credit) cost	6
Total amount that will be amortized from accumulated other comprehensive income	220
Deferred tax benefit	(77)
Accumulated other comprehensive loss, net of tax	$ 143

EMPLOYEE BENEFITS - Assumption

EMPLOYEE BENEFITS - Assumptions Used to Calculate Benefit Obligation, Net Periodic Benefit Cost and Postretirement Benefit (Details)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Pension Plan
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate	4.56%	4.14%
Compensation increase rate	3.50%	3.50%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount Rate	4.14%	5.06%	4.08%
Expected Long-term Return on Assets	7.25%	7.25%	7.25%
Compensation increase rate	3.50%	4.50%	4.50%
Defined Benefit Pension Plan Acquired
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate	4.56%	4.14%
Compensation increase rate	0.00%	0.00%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount Rate	4.14%
Expected Long-term Return on Assets	7.25%
Compensation increase rate	0.00%
Restoration Plan
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate	4.56%	4.14%
Compensation increase rate	3.50%	3.50%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount Rate	4.14%	5.06%	4.08%
Compensation increase rate	3.50%	4.50%	4.50%

EMPLOYEE BENEFITS - Pension Pl

EMPLOYEE BENEFITS - Pension Plan Asset Categories (Details) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Pension Plan
Defined Benefit Plan, Categories of Plan Assets [Abstract]
Total fair value of plan assets		$ 76,355	$ 79,730	$ 78,990	$ 63,165
Defined Benefit Pension Plan Acquired
Defined Benefit Plan, Categories of Plan Assets [Abstract]
Total fair value of plan assets	[1]	3,740	4,512	$ 0
Level 1 | Defined Benefit Pension Plan | Cash
Defined Benefit Plan, Categories of Plan Assets [Abstract]
Total fair value of plan assets		588	2,176
Level 1 | Defined Benefit Pension Plan | U.S. large cap equities
Defined Benefit Plan, Categories of Plan Assets [Abstract]
Total fair value of plan assets	[2]	26,098	25,550
Level 1 | Defined Benefit Pension Plan | U.S. mid cap equities
Defined Benefit Plan, Categories of Plan Assets [Abstract]
Total fair value of plan assets	[3]	7,527	7,653
Level 1 | Defined Benefit Pension Plan | U.S. small cap equities
Defined Benefit Plan, Categories of Plan Assets [Abstract]
Total fair value of plan assets	[4]	6,186	7,000
Level 1 | Defined Benefit Pension Plan | Corporate bonds
Defined Benefit Plan, Categories of Plan Assets [Abstract]
Total fair value of plan assets	[5]	0	0
Level 1 | Defined Benefit Pension Plan | International developed
Defined Benefit Plan, Categories of Plan Assets [Abstract]
Total fair value of plan assets	[6]	2,975	3,320
Level 1 | Defined Benefit Pension Plan | International emerging
Defined Benefit Plan, Categories of Plan Assets [Abstract]
Total fair value of plan assets	[3]	1,108	1,302
Level 1 | Defined Benefit Pension Plan Acquired | Cash
Defined Benefit Plan, Categories of Plan Assets [Abstract]
Total fair value of plan assets		0	0
Level 1 | Defined Benefit Pension Plan Acquired | U.S. large cap equities
Defined Benefit Plan, Categories of Plan Assets [Abstract]
Total fair value of plan assets	[2]	0	752
Level 1 | Defined Benefit Pension Plan Acquired | U.S. mid cap equities
Defined Benefit Plan, Categories of Plan Assets [Abstract]
Total fair value of plan assets	[3]	0	387
Level 1 | Defined Benefit Pension Plan Acquired | U.S. small cap equities
Defined Benefit Plan, Categories of Plan Assets [Abstract]
Total fair value of plan assets	[4]	0	1,159
Level 1 | Defined Benefit Pension Plan Acquired | Corporate bonds
Defined Benefit Plan, Categories of Plan Assets [Abstract]
Total fair value of plan assets	[5]	0	357
Level 1 | Defined Benefit Pension Plan Acquired | International developed
Defined Benefit Plan, Categories of Plan Assets [Abstract]
Total fair value of plan assets	[6]	0	340
Level 1 | Defined Benefit Pension Plan Acquired | International emerging
Defined Benefit Plan, Categories of Plan Assets [Abstract]
Total fair value of plan assets	[3]	0	359
Level 2 | Defined Benefit Pension Plan | Cash equivalents
Defined Benefit Plan, Categories of Plan Assets [Abstract]
Total fair value of plan assets		13,491	17,548
Level 2 | Defined Benefit Pension Plan | U.S. large cap equities
Defined Benefit Plan, Categories of Plan Assets [Abstract]
Total fair value of plan assets		0	0
Level 2 | Defined Benefit Pension Plan | U.S. mid cap equities
Defined Benefit Plan, Categories of Plan Assets [Abstract]
Total fair value of plan assets		0	0
Level 2 | Defined Benefit Pension Plan | U.S. small cap equities
Defined Benefit Plan, Categories of Plan Assets [Abstract]
Total fair value of plan assets		0	0
Level 2 | Defined Benefit Pension Plan | International
Defined Benefit Plan, Categories of Plan Assets [Abstract]
Total fair value of plan assets		0	0
Level 2 | Defined Benefit Pension Plan | Corporate bonds
Defined Benefit Plan, Categories of Plan Assets [Abstract]
Total fair value of plan assets	[5]	1,443	794
Level 2 | Defined Benefit Pension Plan | U.S. government agencies
Defined Benefit Plan, Categories of Plan Assets [Abstract]
Total fair value of plan assets	[5]	9,116	3,583
Level 2 | Defined Benefit Pension Plan | Municipal bonds
Defined Benefit Plan, Categories of Plan Assets [Abstract]
Total fair value of plan assets	[5]	7,365	10,202
Level 2 | Defined Benefit Pension Plan | U.S. agency mortgage-backed securities
Defined Benefit Plan, Categories of Plan Assets [Abstract]
Total fair value of plan assets	[7]	458	602
Level 2 | Defined Benefit Pension Plan | Asset-backed Securities
Defined Benefit Plan, Categories of Plan Assets [Abstract]
Total fair value of plan assets	[8]	0	0
Level 2 | Defined Benefit Pension Plan | Real Estate
Defined Benefit Plan, Categories of Plan Assets [Abstract]
Total fair value of plan assets	[9]	0	0
Level 2 | Defined Benefit Pension Plan | Balanced Asset Allocation
Defined Benefit Plan, Categories of Plan Assets [Abstract]
Total fair value of plan assets	[10]	0	0
Level 2 | Defined Benefit Pension Plan | Other
Defined Benefit Plan, Categories of Plan Assets [Abstract]
Total fair value of plan assets	[11]	0	0
Level 2 | Defined Benefit Pension Plan Acquired | Cash equivalents
Defined Benefit Plan, Categories of Plan Assets [Abstract]
Total fair value of plan assets		0	0
Level 2 | Defined Benefit Pension Plan Acquired | U.S. large cap equities
Defined Benefit Plan, Categories of Plan Assets [Abstract]
Total fair value of plan assets		1,231	382
Level 2 | Defined Benefit Pension Plan Acquired | U.S. mid cap equities
Defined Benefit Plan, Categories of Plan Assets [Abstract]
Total fair value of plan assets		157	415
Level 2 | Defined Benefit Pension Plan Acquired | U.S. small cap equities
Defined Benefit Plan, Categories of Plan Assets [Abstract]
Total fair value of plan assets		156	0
Level 2 | Defined Benefit Pension Plan Acquired | International
Defined Benefit Plan, Categories of Plan Assets [Abstract]
Total fair value of plan assets		514	0
Level 2 | Defined Benefit Pension Plan Acquired | Corporate bonds
Defined Benefit Plan, Categories of Plan Assets [Abstract]
Total fair value of plan assets	[5]	376	0
Level 2 | Defined Benefit Pension Plan Acquired | U.S. government agencies
Defined Benefit Plan, Categories of Plan Assets [Abstract]
Total fair value of plan assets	[5]	0	0
Level 2 | Defined Benefit Pension Plan Acquired | Municipal bonds
Defined Benefit Plan, Categories of Plan Assets [Abstract]
Total fair value of plan assets	[5]	0	0
Level 2 | Defined Benefit Pension Plan Acquired | U.S. agency mortgage-backed securities
Defined Benefit Plan, Categories of Plan Assets [Abstract]
Total fair value of plan assets	[7]	0	361
Level 2 | Defined Benefit Pension Plan Acquired | Asset-backed Securities
Defined Benefit Plan, Categories of Plan Assets [Abstract]
Total fair value of plan assets	[8]	729	0
Level 2 | Defined Benefit Pension Plan Acquired | Real Estate
Defined Benefit Plan, Categories of Plan Assets [Abstract]
Total fair value of plan assets	[9]	189	0
Level 2 | Defined Benefit Pension Plan Acquired | Balanced Asset Allocation
Defined Benefit Plan, Categories of Plan Assets [Abstract]
Total fair value of plan assets	[10]	189	0
Level 2 | Defined Benefit Pension Plan Acquired | Other
Defined Benefit Plan, Categories of Plan Assets [Abstract]
Total fair value of plan assets	[11]	$ 199	$ 0
[1]	Defined benefit plan acquired with the acquisition of Omni on December 17, 2014.
[2]	This category is comprised of individual securities that are actively managed and a broadly diversified "passive" mutual fund.
[3]	This category is comprised of broadly diversified ‘passive’ mutual funds.
[4]	For the defined benefit pension plan, this category is comprised primarily of Southside Bancshares stock that is owned in the Plan and a broadly diversified "passive" mutual fund.
[5]	This category is comprised of individual investment grade securities that are generally held to maturity in the Plan. The Acquired Plan assets in this category consist of investment grade and below investment grade bonds.
[6]	This category is comprised of a broadly ‘passive’ mutual fund.
[7]	This category is comprised of individual securities that are generally not held to maturity.
[8]	This category is mainly comprised of asset backed securities, residential mortgage backed securities, commercial mortgage backed securities and corporate bonds.
[9]	This category is comprised of commercial real estate and includes mortgage loans which are backed by the associated properties.
[10]	This category is comprised of a combination of fixed income and equity investment options.
[11]	This category is comprised of a broad range of instruments including, but not limited to, equities, bonds, currencies, convertible securities and derivatives such as futures, options, swaps and forwards.

EMPLOYEE BENEFITS - Expected F

EMPLOYEE BENEFITS - Expected Future Benefit Payments (Details) $ in Thousands	Dec. 31, 2015USD ($)
Defined Benefit Pension Plan
Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity [Abstract]
2,016	$ 2,921
2,017	3,243
2,018	3,565
2,019	3,779
2,020	3,980
2021 through 2025	22,707
Total expected future payments	40,195
Defined Benefit Pension Plan Acquired
Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity [Abstract]
2,016	112
2,017	56
2,018	67
2,019	76
2,020	230
2021 through 2025	842
Total expected future payments	1,383
Restoration Plan
Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity [Abstract]
2,016	346
2,017	570
2,018	618
2,019	668
2,020	726
2021 through 2025	4,406
Total expected future payments	$ 7,334

EMPLOYEE BENEFITS - Stock Opti

EMPLOYEE BENEFITS - Stock Option Valuation Assumptions (Details) - Stock options - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value method used	Black-Scholes option-pricing model
Weighted-average grant date fair value per option	$ 6.29	$ 8.58
Weighted-average assumptions:
Risk-free interest rates	2.01%	2.23%
Expected dividend yield	3.24%	3.10%
Expected volatility factors of the market price of Southside Bancshares common stock	30.91%	40.88%
Expected option life (in years)	6 years 4 months	6 years 11 months 4 days

EMPLOYEE BENEFITS - Summary of

EMPLOYEE BENEFITS - Summary of Activity of Share-based Plans (Details)	12 Months Ended
	Dec. 31, 2015$ / sharesshares
Shares Available for Grant for All Share-based Plans [Roll Forward]
Balance, January 1, 2015 (shares) | shares	821,604
Granted (shares) | shares	(427,587)
Stock awards vested (shares) | shares	0
Forfeited (shares) | shares	32,018
Canceled/expired (shares) | shares	1,254
Balance, December 31, 2015 (shares) | shares	427,289
Restricted stock
Number of Shares
Balance, January 1, 2015 (shares) | shares	31,753
Granted (shares) | shares	57,482
Stock awards vested (shares) | shares	(16,497)
Forfeited (shares) | shares	(3,324)
Canceled/expired (shares) | shares	0
Balance, December 31, 2015 (shares) | shares	69,414
Weighted- Average Grant-Date Fair Value
Balance, January 1, 2015 (in dollars per share) | $ / shares	$ 21.75
Granted (in dollars per share) | $ / shares	27.63
Stock awards vested (in dollars per share) | $ / shares	20.33
Forfeited (in dollars per share) | $ / shares	25.14
Canceled/expired (in dollars per share) | $ / shares	0
Balance, December 31, 2015 (in dollars per share) | $ / shares	$ 26.79
Stock options
Number of Shares
Balance, January 1, 2015 (shares) | shares	419,334
Granted (shares) | shares	370,105
Stock options exercised (shares) | shares	(12,895)
Stock awards vested (shares) | shares	0
Forfeited (shares) | shares	(28,694)
Canceled/expired (shares) | shares	(1,254)
Balance, December 31, 2015 (shares) | shares	746,596
Weighted- Average Exercise Price
Balance, January 1, 2015 (in dollars per share) | $ / shares	$ 19.88
Granted (in dollars per share) | $ / shares	28.08
Stock options exercised (in dollars per share) | $ / shares	18.27
Forfeited (in dollars per share) | $ / shares	24.29
Canceled/expired (in dollars per share) | $ / shares	24.62
Balance, December 31, 2015 (in dollars per share) | $ / shares	23.79
Weighted- Average Grant-Date Fair Value
Balance, January 1, 2015 (in dollars per share) | $ / shares	6
Granted (in dollars per share) | $ / shares	6.29
Stock options exercised (in dollars per share) | $ / shares	5.45
Stock awards vested (in dollars per share) | $ / shares	0
Forfeited (in dollars per share) | $ / shares	6.69
Canceled/expired (in dollars per share) | $ / shares	7.78
Balance, December 31, 2015 (in dollars per share) | $ / shares	$ 6.12

EMPLOYEE BENEFITS - Stock O102

EMPLOYEE BENEFITS - Stock Options Exercise Price Range (Details)	12 Months Ended
	Dec. 31, 2015$ / sharesshares
Options Outstanding
Number of Shares | shares	746,596
Weighted- Average Exercise Price (in dollars per share)	$ 23.79
Weighted- Average Remaining Contractual Life in Years	8 years 4 days
Options Exercisable
Number of Shares | shares	295,254
Weighted- Average Exercise Price (in dollars per share)	$ 18.93
$15.79 - $20.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices - Lower Range Limit (in dollars per share)	15.79
Range of Exercise Prices - Upper Range Limit (in dollars per share)	$ 20
Options Outstanding
Number of Shares | shares	248,088
Weighted- Average Exercise Price (in dollars per share)	$ 17.11
Weighted- Average Remaining Contractual Life in Years	6 years 1 month
Options Exercisable
Number of Shares | shares	219,829
Weighted- Average Exercise Price (in dollars per share)	$ 16.98
$20.01 - $25.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices - Lower Range Limit (in dollars per share)	20.01
Range of Exercise Prices - Upper Range Limit (in dollars per share)	$ 25
Options Outstanding
Number of Shares | shares	142,574
Weighted- Average Exercise Price (in dollars per share)	$ 24.62
Weighted- Average Remaining Contractual Life in Years	7 years 10 months 30 days
Options Exercisable
Number of Shares | shares	75,425
Weighted- Average Exercise Price (in dollars per share)	$ 24.62
$25.01 - $28.51
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices - Lower Range Limit (in dollars per share)	25.01
Range of Exercise Prices - Upper Range Limit (in dollars per share)	$ 28.51
Options Outstanding
Number of Shares | shares	355,934
Weighted- Average Exercise Price (in dollars per share)	$ 28.12
Weighted- Average Remaining Contractual Life in Years	9 years 4 months 21 days
Options Exercisable
Number of Shares | shares	0
Weighted- Average Exercise Price (in dollars per share)	$ 0

FAIR VALUE MEASUREMENT - Fair

FAIR VALUE MEASUREMENT - Fair Value Measurements, Recurring and Nonrecurring Basis (Details) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
Level 1
Recurring fair value measurement [Abstract]
Assets, Fair Value Disclosure, Recurring		$ 109,603	$ 20,955
Nonrecurring fair value measurements [Abstract]
Assets, Fair Value Disclosure, Nonrecurring		0	0
Level 1 | Foreclosed assets
Nonrecurring fair value measurements [Abstract]
Assets, Fair Value Disclosure, Nonrecurring		0	0
Level 1 | Impaired loans
Nonrecurring fair value measurements [Abstract]
Assets, Fair Value Disclosure, Nonrecurring	[1]	0	0
Level 1 | US Treasury
Recurring fair value measurement [Abstract]
Assets, Fair Value Disclosure, Recurring		103,587	14,906
Level 1 | U.S. Government Agency Debentures
Recurring fair value measurement [Abstract]
Assets, Fair Value Disclosure, Recurring		0	0
Level 1 | State and Political Subdivisions
Recurring fair value measurement [Abstract]
Assets, Fair Value Disclosure, Recurring		0	0
Level 1 | Other Stocks and Bonds
Recurring fair value measurement [Abstract]
Assets, Fair Value Disclosure, Recurring		0	0
Level 1 | Other Equity Securities
Recurring fair value measurement [Abstract]
Assets, Fair Value Disclosure, Recurring		6,016	6,049
Level 1 | Residential MBS
Recurring fair value measurement [Abstract]
Assets, Fair Value Disclosure, Recurring	[2]	0	0
Level 1 | Commercial MBS
Recurring fair value measurement [Abstract]
Assets, Fair Value Disclosure, Recurring	[2]	0	0
Level 2
Recurring fair value measurement [Abstract]
Assets, Fair Value Disclosure, Recurring		1,350,889	1,427,753
Nonrecurring fair value measurements [Abstract]
Assets, Fair Value Disclosure, Nonrecurring		0	0
Level 2 | Foreclosed assets
Nonrecurring fair value measurements [Abstract]
Assets, Fair Value Disclosure, Nonrecurring		0	0
Level 2 | Impaired loans
Nonrecurring fair value measurements [Abstract]
Assets, Fair Value Disclosure, Nonrecurring	[1]	0	0
Level 2 | US Treasury
Recurring fair value measurement [Abstract]
Assets, Fair Value Disclosure, Recurring		0	0
Level 2 | U.S. Government Agency Debentures
Recurring fair value measurement [Abstract]
Assets, Fair Value Disclosure, Recurring		0	4,828
Level 2 | State and Political Subdivisions
Recurring fair value measurement [Abstract]
Assets, Fair Value Disclosure, Recurring		244,246	267,684
Level 2 | Other Stocks and Bonds
Recurring fair value measurement [Abstract]
Assets, Fair Value Disclosure, Recurring		12,790	13,239
Level 2 | Other Equity Securities
Recurring fair value measurement [Abstract]
Assets, Fair Value Disclosure, Recurring		0	0
Level 2 | Residential MBS
Recurring fair value measurement [Abstract]
Assets, Fair Value Disclosure, Recurring	[2]	588,502	964,298
Level 2 | Commercial MBS
Recurring fair value measurement [Abstract]
Assets, Fair Value Disclosure, Recurring	[2]	505,351	177,704
Level 3
Recurring fair value measurement [Abstract]
Assets, Fair Value Disclosure, Recurring		0	0
Nonrecurring fair value measurements [Abstract]
Assets, Fair Value Disclosure, Nonrecurring		25,091	11,707
Level 3 | Foreclosed assets
Nonrecurring fair value measurements [Abstract]
Assets, Fair Value Disclosure, Nonrecurring		808	2,303
Level 3 | Impaired loans
Nonrecurring fair value measurements [Abstract]
Assets, Fair Value Disclosure, Nonrecurring	[1]	24,283	9,404
Level 3 | US Treasury
Recurring fair value measurement [Abstract]
Assets, Fair Value Disclosure, Recurring		0	0
Level 3 | U.S. Government Agency Debentures
Recurring fair value measurement [Abstract]
Assets, Fair Value Disclosure, Recurring		0	0
Level 3 | State and Political Subdivisions
Recurring fair value measurement [Abstract]
Assets, Fair Value Disclosure, Recurring		0
Level 3 | Other Stocks and Bonds
Recurring fair value measurement [Abstract]
Assets, Fair Value Disclosure, Recurring		0	0
Level 3 | Other Equity Securities
Recurring fair value measurement [Abstract]
Assets, Fair Value Disclosure, Recurring		0	0
Level 3 | Residential MBS
Recurring fair value measurement [Abstract]
Assets, Fair Value Disclosure, Recurring	[2]	0	0
Level 3 | Commercial MBS
Recurring fair value measurement [Abstract]
Assets, Fair Value Disclosure, Recurring	[2]	0	0
Carrying Amount
Recurring fair value measurement [Abstract]
Assets, Fair Value Disclosure, Recurring		1,460,492	1,448,708
Nonrecurring fair value measurements [Abstract]
Assets, Fair Value Disclosure, Nonrecurring		25,091	11,707
Carrying Amount | Foreclosed assets
Nonrecurring fair value measurements [Abstract]
Assets, Fair Value Disclosure, Nonrecurring		808	2,303
Carrying Amount | Impaired loans
Nonrecurring fair value measurements [Abstract]
Assets, Fair Value Disclosure, Nonrecurring	[1]	24,283	9,404
Carrying Amount | US Treasury
Recurring fair value measurement [Abstract]
Assets, Fair Value Disclosure, Recurring		103,587	14,906
Carrying Amount | U.S. Government Agency Debentures
Recurring fair value measurement [Abstract]
Assets, Fair Value Disclosure, Recurring		0	4,828
Carrying Amount | State and Political Subdivisions
Recurring fair value measurement [Abstract]
Assets, Fair Value Disclosure, Recurring		244,246	267,684
Carrying Amount | Other Stocks and Bonds
Recurring fair value measurement [Abstract]
Assets, Fair Value Disclosure, Recurring		12,790	13,239
Carrying Amount | Other Equity Securities
Recurring fair value measurement [Abstract]
Assets, Fair Value Disclosure, Recurring		6,016	6,049
Carrying Amount | Residential MBS
Recurring fair value measurement [Abstract]
Assets, Fair Value Disclosure, Recurring	[2]	588,502	964,298
Carrying Amount | Commercial MBS
Recurring fair value measurement [Abstract]
Assets, Fair Value Disclosure, Recurring	[2]	$ 505,351	$ 177,704
[1]	Loans represent collateral dependent impaired loans with a specific valuation allowance. Losses on these loans represent charge-offs which are netted against the allowance for loan losses.
[2]	All mortgage-backed securities issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.

FAIR VALUE MEASUREMENT - Fa104

FAIR VALUE MEASUREMENT - Fair Value, Balance Sheet Grouping (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Investment securities:
Investment Securities held-to-maturity securities, fair value disclosure	$ 397,194	$ 400,248
Mortgage-backed securities:
Held to maturity, at carrying value	402,569	261,339
Level 1
Financial Assets
Cash and cash equivalents	80,975	84,655
Investment securities:
Investment Securities held-to-maturity securities, fair value disclosure	0	0
Mortgage-backed securities:
Held to maturity, at carrying value	0	0
FHLB stock and other investments, at cost	0	0
Loans, net of allowance for loan losses	0	0
Loans held for sale	0	0
Financial Liabilities:
Retail deposits	0	0
Federal funds purchased and repurchase agreements	0	0
FHLB advances	0	0
Long-term debt	0	0
Level 2
Financial Assets
Cash and cash equivalents	0	0
Investment securities:
Investment Securities held-to-maturity securities, fair value disclosure	397,194	400,248
Mortgage-backed securities:
Held to maturity, at carrying value	402,569	261,339
FHLB stock and other investments, at cost	56,509	43,871
Loans, net of allowance for loan losses	0	0
Loans held for sale	3,811	2,899
Financial Liabilities:
Retail deposits	3,449,002	3,369,784
Federal funds purchased and repurchase agreements	2,429	4,237
FHLB advances	1,143,218	886,087
Long-term debt	43,695	43,860
Level 3
Financial Assets
Cash and cash equivalents	0	0
Investment securities:
Investment Securities held-to-maturity securities, fair value disclosure	0	0
Mortgage-backed securities:
Held to maturity, at carrying value	0	0
FHLB stock and other investments, at cost	0	0
Loans, net of allowance for loan losses	2,364,968	2,140,088
Loans held for sale	0	0
Financial Liabilities:
Retail deposits	0	0
Federal funds purchased and repurchase agreements	0	0
FHLB advances	0	0
Long-term debt	0	0
Carrying Amount
Financial Assets
Cash and cash equivalents	80,975	84,655
Investment securities:
Investment Securities held-to-maturity securities, fair value disclosure	385,496	388,823
Mortgage-backed securities:
Held to maturity, at carrying value	398,800	253,496
FHLB stock and other investments, at cost	56,509	43,871
Loans, net of allowance for loan losses	2,412,017	2,167,841
Loans held for sale	3,811	2,899
Financial Liabilities:
Retail deposits	3,455,407	3,374,417
Federal funds purchased and repurchase agreements	2,429	4,237
FHLB advances	1,147,688	897,420
Long-term debt	60,311	60,311
Estimated Fair Value
Financial Assets
Cash and cash equivalents	80,975	84,655
Investment securities:
Investment Securities held-to-maturity securities, fair value disclosure	397,194	400,248
Mortgage-backed securities:
Held to maturity, at carrying value	402,569	261,339
FHLB stock and other investments, at cost	56,509	43,871
Loans, net of allowance for loan losses	2,364,968	2,140,088
Loans held for sale	3,811	2,899
Financial Liabilities:
Retail deposits	3,449,002	3,369,784
Federal funds purchased and repurchase agreements	2,429	4,237
FHLB advances	1,143,218	886,087
Long-term debt	$ 43,695	$ 43,860

FAIR VALUE MEASUREMENT - Fair V

FAIR VALUE MEASUREMENT - Fair Value Measurements, Securities Available for Sale, Narrative	12 Months Ended
	Dec. 31, 2015source
Fair Value Disclosures [Abstract]
Number of third party sources used to validate prices	3

SHAREHOLDERS' EQUITY - Regulat

SHAREHOLDERS' EQUITY - Regulatory Capital Requirements (Details) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
Consolidated
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Basel III Common Equity TIer 1, Amount		$ 368,865
Basel III common equity Tier 1, Ratio		12.71%
Basel III common equity Tier 1 Minimum Requirement		$ 130,549
Basel III common equity TIer 1, Minimum Requirement to Risk Weighted Assets		4.50%
Total Capital (to Risk Weighted Assets)
Total Capital		$ 443,106	$ 412,893
Total Capital Required for Capital Adequacy Purposes		$ 232,087	$ 197,863
Total Capital (to Risk Weighted Assets) Ratios
Total Capital to Risk Weighted Assets		15.27%	16.69%
Total Capital Required for Capital Adequacy Purposes to Risk Weighted Assets		8.00%	8.00%
Tier 1 Capital (to Risk Weighted Assets)
Tier 1 Capital		$ 422,513	$ 398,798
Tier 1 Capital Required for Capital Adequacy Purposes		$ 174,065	$ 98,932
Tier 1 Capital (to Risk Weighted Assets) Ratios
Tier 1 Capital to Risk Weighted Assets		14.56%	16.12%
Tier 1 Capital Required for Capital Adequacy Purposes to Risk Weighted Assets		6.00%	4.00%
Tier 1 Capital (to Average Assets)
Tier 1 Capital	[1]	$ 422,513	$ 398,798
Tier 1 Capital Required for Capital Adequacy Purposes	[1]	$ 196,347	$ 140,492
Tier 1 Capital (to Average Assets) Ratios
Tier 1 Capital to Average Assets	[1]	8.61%	11.35%
Tier 1 Capital Required for Capital Adequacy Purposes to Average Assets	[1]	4.00%	4.00%
Bank Only
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Basel III Common Equity TIer 1, Amount		$ 416,378
Basel III common equity Tier 1, Ratio		14.36%
Basel III common equity Tier 1 Minimum Requirement		$ 130,446
Basel III common equity TIer 1, Minimum Requirement to Risk Weighted Assets		4.50%
Basel III common equity Tier 1 to be well capitalized		$ 188,422
Basel III common equity Tier 1 to be well capitalized to risk weighted assets		6.50%
Total Capital (to Risk Weighted Assets)
Total Capital		$ 436,971	$ 398,104
Total Capital Required for Capital Adequacy Purposes		231,904	197,503
Total Capital Required to be Well Capitalized		$ 289,881	$ 246,878
Total Capital (to Risk Weighted Assets) Ratios
Total Capital to Risk Weighted Assets		15.07%	16.13%
Total Capital Required for Capital Adequacy Purposes to Risk Weighted Assets		8.00%	8.00%
Total Capital Required to be Well Capitalized to Risk Weighted Assets		10.00%	10.00%
Tier 1 Capital (to Risk Weighted Assets)
Tier 1 Capital		$ 416,378	$ 384,009
Tier 1 Capital Required for Capital Adequacy Purposes		173,928	98,751
Tier 1 Capital Required to be Well Capitalized		$ 231,904	$ 148,127
Tier 1 Capital (to Risk Weighted Assets) Ratios
Tier 1 Capital to Risk Weighted Assets		14.36%	15.55%
Tier 1 Capital Required for Capital Adequacy Purposes to Risk Weighted Assets		6.00%	4.00%
Tier 1 Capital Required to be Well Capitalized to Risk Weighted Assets		8.00%	6.00%
Tier 1 Capital (to Average Assets)
Tier 1 Capital	[1]	$ 416,378	$ 384,009
Tier 1 Capital Required for Capital Adequacy Purposes	[1]	196,209	140,329
Tier 1 Capital Required to be Well Capitalized	[1]	$ 245,261	$ 175,412
Tier 1 Capital (to Average Assets) Ratios
Tier 1 Capital to Average Assets	[1]	8.49%	10.95%
Tier 1 Capital Required for Capital Adequacy Purposes to Average Assets	[1]	4.00%	4.00%
Tier 1 Capital Required to be Well Capitalized to Average Assets	[1]	5.00%	5.00%
[1]	Refers to quarterly average assets as calculated in accordance with policies established by bank regulatory agencies.

SHAREHOLDERS' EQUITY - Narrativ

SHAREHOLDERS' EQUITY - Narrative (Details) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Payments of Ordinary Dividends [Abstract]
Dividends paid on common stock (in dollars per share)	$ 1	$ 0.96	$ 0.91
Dividends declared on common stock (in dollars per share)	$ 1	$ 0.96	$ 0.91

DIVIDEND REINVESTMENT AND CO108

DIVIDEND REINVESTMENT AND COMMON STOCK REPURCHASE PLAN (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Net Investment Income [Line Items]
Stock issued during period under dividend reinvestment plan (in shares)	49,908	40,142
Stock issued during period under dividend reinvestment plan, average price per share	$ 27.46	$ 30.23
Purchase of common stock, cost			$ 1,899
Purchase of common stock (in shares)	0	0	90,300

INCOME TAXES - Provision for I

INCOME TAXES - Provision for Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Current income tax (benefit) expense									$ 10,671	$ (1,239)	$ 6,041
Deferred income tax (benefit) expense									(3,392)	(925)	(944)
Income tax (benefit) expense	$ 1,438	$ 1,971	$ 1,967	$ 1,903	$ (3,918)	$ (243)	$ 838	$ 1,159	$ 7,279	$ (2,164)	$ 5,097

INCOME TAXES - Summary of Net

INCOME TAXES - Summary of Net Deferred Tax Assets (Liabilities) (Details) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Assets
Allowance for loan losses	$ 6,907,000	$ 4,625,000
Fair value adjustment on loans	5,143,000	6,381,000
Fair value adjustment on time deposits	302,000	767,000
Alternative minimum tax credit	7,465,000	5,613,000
Unfunded status of defined benefit plan	9,931,000	11,743,000
State business tax credit	622,000	639,000
Stock-based compensation	841,000	494,000
Other	220,000	803,000
Gross deferred tax assets	31,431,000	31,065,000
Liabilities
Retirement and other benefit plans	(2,220,000)	(3,250,000)
Unrealized gains on securities available for sale	(1,298,000)	(5,112,000)
Premises and equipment	(5,797,000)	(7,033,000)
Core deposit intangible	(2,213,000)	(2,963,000)
Gross deferred tax liabilities	(11,528,000)	(18,358,000)
Net deferred tax asset at year-end	19,903,000	12,707,000
Deferred Tax Assets, Valuation Allowance	$ 0	$ 0

INCOME TAXES - Income Tax Expe

INCOME TAXES - Income Tax Expense Reconciliation (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Amount
Statutory tax expense									$ 17,946,000	$ 6,348,000	$ 15,738,000
Increase (decrease) in taxes from:
Tax exempt interest									(9,975,000)	(9,942,000)	(10,298,000)
Bank Owned Life Insurance									(914,000)	(451,000)	(1,059,000)
Share based compensation									(75,000)	766,000	0
Acquisition costs									0	787,000	0
State Business Tax									0	146,000	350,000
Other, net									297,000	182,000	366,000
Income tax (benefit) expense	$ 1,438,000	$ 1,971,000	$ 1,967,000	$ 1,903,000	$ (3,918,000)	$ (243,000)	$ 838,000	$ 1,159,000	$ 7,279,000	$ (2,164,000)	$ 5,097,000
Percent of Pre-Tax Income
Statutory tax expense									35.00%	34.00%	34.00%
Increase (Decrease) in Taxes From:
Percent of Pre-tax income, Tax exempt interest									(19.50%)	(53.30%)	(22.20%)
Percent of Pre-tax income, Bank Owned Life Insurance									(1.80%)	(2.40%)	(2.30%)
Percent of Pre-tax income, Share based compensation									(0.10%)	4.10%	0.00%
Percent of Pre-tax income, Acquisition Costs									0.00%	4.20%	0.00%
Percent of Pre-tax income, State Business Tax									0.00%	0.80%	0.70%
Percent of Pre-tax income, Other Net									0.60%	1.00%	0.80%
Percent of Pre-tax income, Income tax (benefit) expense									14.20%	(11.60%)	11.00%
Deferred Tax Assets, Valuation Allowance	$ 0				$ 0				$ 0	$ 0

OFF-BALANCE-SHEET ARRANGEMEN112

OFF-BALANCE-SHEET ARRANGEMENTS, COMMITMENTS AND CONTINGENCIES - Off-Balance Sheet Arrangements, Commitments and Contingencies (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial instruments with off-balance sheet risk, at fair value	$ 554,412	$ 379,477
Commitments to Extend Credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial instruments with off-balance sheet risk, at fair value	546,660	373,255
Standby Letters of Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial instruments with off-balance sheet risk, at fair value	$ 7,752	$ 6,222

OFF-BALANCE-SHEET ARRANGEMEN113

OFF-BALANCE-SHEET ARRANGEMENTS, COMMITMENTS AND CONTINGENCIES - Operating Lease Commitments and Rent Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2,016	$ 1,988
2,017	1,523
2,018	1,245
2,019	861
2,020	580
Thereafter	267
Total future minimum payments due	6,464
Branch facilities
Operating Leases, Rent Expense, Net [Abstract]
Rent expense	2,500	$ 1,600	$ 1,400
Leased equipment
Operating Leases, Rent Expense, Net [Abstract]
Rent expense	$ 297	$ 235	$ 251

OFF-BALANCE-SHEET ARRANGEMEN114

OFF-BALANCE-SHEET ARRANGEMENTS, COMMITMENTS AND CONTINGENCIES - Operating Lease - Lessor (Details) ft² in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)ft²	Dec. 31, 2014USD ($)ft²
Commitments and Contingencies Disclosure [Abstract]
2,016	$ 3,093
2,017	2,746
2,018	2,023
2,019	1,684
2,020	1,572
Thereafter	4,002
Operating Leases, Future Minimum Payments Receivable	$ 15,120
Operating Leases, Income Statement, Lease Revenue [Abstract]
Square feet in office building acquired | ft²		202
Number of square feet occupied by bank branch and operations in building acquired | ft²	42
Lease Revenue	$ 2,800	$ 116

OFF-BALANCE-SHEET ARRANGEMEN115

OFF-BALANCE-SHEET ARRANGEMENTS, COMMITMENTS AND CONTINGENCIES - Narrative (Details) - USD ($)	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Securities
Unsettled trades to purchase securities	$ 19,350,000	$ 5,982,000	$ 973,000
Unsettled trades to sell securities	9,343,000	57,202,000	$ 3,933,000
Deposits [Abstract]
Unsettled issuances of brokered cds	$ 0	$ 0

SIGNIFICANT GROUP CONCENTRAT116

SIGNIFICANT GROUP CONCENTRATIONS OF CREDIT RISK (Details)	12 Months Ended
	Dec. 31, 2015Rate
Credit Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	37.90%
Concentration Risk, Additional Characteristic	loans collateralized by residential dwellings that are primarily owner-occupied
Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	1.34%
Concentration Risk, Other Risk	Our oil and gas exposure in the loan portfolio

PARENT COMPANY FINANCIAL INF117

PARENT COMPANY FINANCIAL INFORMATION - BALANCE SHEETS (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
ASSETS
Cash and due from banks	$ 54,288	$ 64,001
Other assets	10,953	19,163
TOTAL ASSETS	5,162,076	4,807,261
Liabilities [Abstract]
Long-term debt	60,311	60,311
Other liabilities	32,829	39,651
TOTAL LIABILITIES	4,718,014	4,382,018
Stockholders' Equity Attributable to Parent [Abstract]
Common stock: ($1.25 par, 40,000,000 shares authorized, 27,865,798 shares issued in 2015 and 26,578,127 shares issued in 2014)	34,832	33,223
Paid-in capital	424,078	389,886
Retained earnings	41,527	55,396
Treasury stock (2,469,638 shares at cost)	(37,692)	(37,692)
Accumulated other comprehensive loss	(18,683)	(15,570)	$ (21,037)	$ 2,938
TOTAL SHAREHOLDERS' EQUITY	444,062	425,243	$ 259,518	$ 257,763
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY	5,162,076	4,807,261
Parent
ASSETS
Cash and due from banks	1,766	11,696
Other assets	7,282	9,998
TOTAL ASSETS	505,004	489,894
Liabilities [Abstract]
Long-term debt	60,311	60,311
Other liabilities	631	4,340
TOTAL LIABILITIES	60,942	64,651
Stockholders' Equity Attributable to Parent [Abstract]
Common stock: ($1.25 par, 40,000,000 shares authorized, 27,865,798 shares issued in 2015 and 26,578,127 shares issued in 2014)	34,832	33,223
Paid-in capital	424,078	389,886
Retained earnings	41,527	55,396
Treasury stock (2,469,638 shares at cost)	(37,692)	(37,692)
Accumulated other comprehensive loss	(18,683)	(15,570)
TOTAL SHAREHOLDERS' EQUITY	444,062	425,243
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY	505,004	489,894
Parent | Bank subsidiaries
ASSETS
Investment in subsidiaries at equity in underlying net assets	494,130	466,374
Parent | Nonbank subsidiaries
ASSETS
Investment in subsidiaries at equity in underlying net assets	$ 1,826	$ 1,826

PARENT COMPANY FINANCIAL INF118

PARENT COMPANY FINANCIAL INFORMATION - BALANCE SHEETS SHARE INFORMATION (Details) - $ / shares	Dec. 31, 2015	Dec. 31, 2014
Common stock, par value (in dollars per share)	$ 1.25	$ 1.25
Common stock, shares authorized (in shares)	40,000,000	40,000,000
Common stock, shares issued (in shares)	27,865,798	26,578,127
Treasury stock, (in shares)	2,469,638	2,469,638
Parent
Common stock, par value (in dollars per share)	$ 1.25	$ 1.25
Common stock, shares authorized (in shares)	40,000,000	40,000,000
Common stock, shares issued (in shares)	27,865,798	26,578,127
Treasury stock, (in shares)	2,469,638	2,469,638

PARENT COMPANY FINANCIAL INF119

PARENT COMPANY FINANCIAL INFORMATION - INCOME STATEMENT (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
INCOME
Total interest income	$ 39,964	$ 38,211	$ 37,750	$ 38,607	$ 29,613	$ 29,840	$ 32,086	$ 32,239	$ 154,532	$ 123,778	$ 119,602
EXPENSE
Interest expense	5,267	4,926	4,845	4,816	4,259	4,120	4,230	4,347	19,854	16,956	17,968
Income tax benefit	(1,438)	(1,971)	(1,967)	(1,903)	3,918	243	(838)	(1,159)	(7,279)	2,164	(5,097)
Net income (loss)	$ 11,692	$ 11,762	$ 11,164	$ 9,379	$ (3,945)	$ 6,097	$ 10,457	$ 8,224	43,997	20,833	41,190
Parent
INCOME
Dividends from subsidiary									17,600	177,000	15,000
Interest income									44	53	43
Total interest income									17,644	177,053	15,043
EXPENSE
Interest expense									1,455	1,424	1,449
Other									3,193	16,144	2,461
TOTAL EXPENSE									4,648	17,568	3,910
Income before income tax expense									12,996	159,485	11,133
Income tax benefit									1,612	4,043	1,315
Income before equity in undistributed earnings of subsidiaries									14,608	163,528	12,448
Equity in undistributed earnings of subsidiaries									29,389	(142,695)	28,742
Net income (loss)									$ 43,997	$ 20,833	$ 41,190

PARENT COMPANY FINANCIAL INF120

PARENT COMPANY FINANCIAL INFORMATION - CASH FLOW (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
OPERATING ACTIVITIES:
Net income	$ 11,692	$ 11,762	$ 11,164	$ 9,379	$ (3,945)	$ 6,097	$ 10,457	$ 8,224	$ 43,997	$ 20,833	$ 41,190
Adjustments to reconcile net income to net cash provided by operations:
Decrease (increase) in other assets									325	(5,573)	(9,310)
(Decrease) increase in other liabilities									(1,775)	4,477	182
Net cash provided by operating activities									72,981	56,034	59,506
INVESTING ACTIVITIES:
Net cash paid for acquisition									0	(127,020)	0
Net cash used in investing activities									(384,409)	(67,290)	(367,803)
FINANCING ACTIVITIES:
Purchase of common stock									0	0	(1,899)
Proceeds from the issuance of common stock									1,370	1,213	1,396
Dividends paid									(25,071)	(17,919)	(16,088)
Net cash provided by financing activities									307,748	41,480	212,098
Net (decrease) increase in cash and cash equivalents									(3,680)	30,224	(96,199)
Cash and cash equivalents at beginning of period				84,655				54,431	84,655	54,431	150,630
Cash and cash equivalents at end of period	80,975				84,655				80,975	84,655	54,431
Parent
OPERATING ACTIVITIES:
Net income									43,997	20,833	41,190
Adjustments to reconcile net income to net cash provided by operations:
Equity in undistributed earnings of subsidiaries									(29,389)	142,695	(28,742)
Decrease (increase) in other assets									2,716	(6,477)	1,032
(Decrease) increase in other liabilities									(3,709)	3,904	319
Net cash provided by operating activities									13,615	160,955	13,799
INVESTING ACTIVITIES:
Investment in subsidiaries									(10)	0	0
Net cash paid for acquisition									0	(136,078)	0
Dissolution of subsidiaries									0	0	1,153
Net cash used in investing activities									(10)	(136,078)	1,153
FINANCING ACTIVITIES:
Purchase of common stock									0	0	(1,899)
Proceeds from the issuance of common stock									1,536	2,287	1,551
Dividends paid									(25,071)	(17,919)	(16,088)
Payments for other financing activities									0	(599)	0
Net cash provided by financing activities									(23,535)	(16,231)	(16,436)
Net (decrease) increase in cash and cash equivalents									(9,930)	8,646	(1,484)
Cash and cash equivalents at beginning of period				$ 11,696				$ 3,050	11,696	3,050	4,534
Cash and cash equivalents at end of period	$ 1,766				$ 11,696				$ 1,766	$ 11,696	$ 3,050

QUARTERLY FINANCIAL INFORMAT121

QUARTERLY FINANCIAL INFORMATION OF REGISTRANT (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items]
Interest income	$ 39,964	$ 38,211	$ 37,750	$ 38,607	$ 29,613	$ 29,840	$ 32,086	$ 32,239	$ 154,532	$ 123,778	$ 119,602
Interest expense	5,267	4,926	4,845	4,816	4,259	4,120	4,230	4,347	19,854	16,956	17,968
Net interest income	34,697	33,285	32,905	33,791	25,354	25,720	27,856	27,892	134,678	106,822	101,634
Provision for loan losses	1,951	2,276	268	3,848	3,287	4,868	2,650	4,133	8,343	14,938	8,879
Net gain (loss) on sale of securities available for sale	204	875	105	2,476	1,170	1,151	498	11	3,660	2,830	8,472
Noninterest income excluding net securities gains	8,611	8,486	8,826	8,312	5,979	3,868	6,017	5,795	37,895	24,489	35,245
Noninterest expense	28,431	26,637	28,437	29,449	37,079	20,017	20,426	20,182	112,954	97,704	81,713
Income before income tax expense	13,130	13,733	13,131	11,282	(7,863)	5,854	11,295	9,383	51,276	18,669	46,287
Provision for income tax expense	1,438	1,971	1,967	1,903	(3,918)	(243)	838	1,159	7,279	(2,164)	5,097
Net income (loss)	$ 11,692	$ 11,762	$ 11,164	$ 9,379	$ (3,945)	$ 6,097	$ 10,457	$ 8,224	$ 43,997	$ 20,833	$ 41,190
Earnings (loss) per common share
Earnings (loss) per common share - basic (in dollars per share)	$ 0.46	$ 0.46	$ 0.44	$ 0.37	$ (0.19)	$ 0.31	$ 0.53	$ 0.41	$ 1.74	$ 1.04	$ 2.09
Earnings (loss) per common share - diluted (in dollars per share)	$ 0.46	$ 0.46	$ 0.44	$ 0.37	$ (0.19)	$ 0.31	$ 0.53	$ 0.41	$ 1.73	$ 1.04	$ 2.09