Southside Bancshares (SBSI) 10-Q 29 Apr 16 2016 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2016	Apr. 25, 2016
Document and Entity Information [Abstract]
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
Document Type	10-Q
Document Period End Date	Mar. 31, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Common Stock, Shares Outstanding		24,969,676

CONSOLIDATED BALANCE SHEETS (UN

CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands		Mar. 31, 2016	Dec. 31, 2015
ASSETS
Cash and due from banks		$ 52,324	$ 54,288
Interest earning deposits		16,130	26,687
Total cash and cash equivalents		68,454	80,975
Securities available for sale, at estimated fair value		1,332,381	1,460,492
Securities held to maturity, at carrying value (estimated fair value of $818,108 and $799,763, respectively)		784,579	784,296
FHLB stock, at cost		47,550	51,047
Other investments		5,501	5,462
Loans held for sale		4,971	3,811
Loans:
Loans	[1]	2,443,231	2,431,753
Less: Allowance for loan losses		(21,799)	(19,736)
Net Loans		2,421,432	2,412,017
Premises and equipment, net		107,556	107,929
Goodwill		91,520	91,520
Other intangible assets, net		6,029	6,548
Interest receivable		16,548	22,700
Deferred tax asset		12,512	19,903
Unsettled trades to sell securities		15,039	9,343
Bank owned life insurance		95,718	95,080
Other assets		9,222	10,953
TOTAL ASSETS		5,019,012	5,162,076
Deposits:
Noninterest bearing		698,695	672,470
Interest bearing		2,920,673	2,782,937
Total deposits		3,619,368	3,455,407
Short-term obligations:
Federal funds purchased and repurchase agreements		2,501	2,429
FHLB advances		257,145	645,407
Total short-term obligations		259,646	647,836
Long-term obligations:
FHLB advances	[2]	561,990	502,281
Long-term debt	[3]	60,311	60,311
Total long-term obligations		622,301	562,592
Unsettled trades to purchase securities		23,920	19,350
Other liabilities		36,201	32,829
TOTAL LIABILITIES		$ 4,561,436	$ 4,718,014
Off-Balance Sheet Arrangements, Commitments and Contingencies
Shareholders’ equity:
Common stock ($1.25 par, 40,000,000 shares authorized, 27,882,740 shares issued at March 31, 2016 and 27,865,798 shares issued at December 31, 2015)		$ 34,853	$ 34,832
Paid-in capital		424,753	424,078
Retained earnings		49,254	41,527
Treasury stock, at cost (2,913,064 at March 31, 2016 and 2,469,638 at December 31, 2015)		(47,891)	(37,692)
Accumulated other comprehensive loss		(3,393)	(18,683)
TOTAL SHAREHOLDERS’ EQUITY		457,576	444,062
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY		$ 5,019,012	$ 5,162,076
[1]	Includes approximately $525.4 million and $581.1 million of loans acquired with the Omni acquisition as of March 31, 2016 and December 31, 2015, respectively. The allowance for loan loss recorded on acquired loans totaled $519,000 and $629,000 as of March 31, 2016 and December 31, 2015, respectively.Real Estate Construction Loans
[2]	At March 31, 2016, the weighted average cost of these advances was 1.17%. Long-term FHLB Advances have maturities ranging from April 2017 through July 2028.
[3]	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.

CONSOLIDATED BALANCE SHEETS (U3

CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Held-to-maturity Securities, Other Disclosure Items [Abstract]
Securities held to maturity, fair value	$ 818,108	$ 799,763
Shareholders' equity:
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)	27,882,740	27,865,798
Treasury stock (in shares)	2,913,064	2,469,638

CONSOLIDATED STATEMENTS OF INCO

CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Interest income
Loans	$ 27,765	$ 23,916
Investment securities – taxable	214	237
Investment securities – tax-exempt	5,355	5,865
Mortgage-backed securities	9,391	8,462
FHLB stock and other investments	217	93
Other interest earning assets	70	34
Total interest income	43,012	38,607
Interest expense
Deposits	3,256	2,529
Short-term obligations	696	142
Long-term obligations	2,443	2,145
Total interest expense	6,395	4,816
Net interest income	36,617	33,791
Provision for loan losses	2,316	3,848
Net interest income after provision for loan losses	34,301	29,943
Noninterest income
Deposit services	5,085	4,989
Net gain on sale of securities available for sale	2,441	2,476
Gain on sale of loans	643	377
Trust income	855	893
Bank owned life insurance income	674	669
Brokerage services	575	639
Other	1,323	745
Total noninterest income	11,596	10,788
Noninterest expense
Salaries and employee benefits	17,732	18,199
Occupancy expense	3,335	3,199
Advertising, travel & entertainment	685	657
ATM and debit card expense	712	679
Professional fees	1,338	742
Software and data processing expense	749	1,031
Telephone and communications	484	469
FDIC insurance	638	638
Other	3,735	3,835
Total noninterest expense	29,408	29,449
Income before income tax expense	16,489	11,282
Income tax expense	2,973	1,903
Net income	$ 13,516	$ 9,379
Earnings per common share - basic (in dollars per share)	$ 0.54	$ 0.37
Earnings per common share - diluted (in dollars per share)	0.54	0.37
Dividends paid per common share (in dollars per shares)	$ 0.23	$ 0.23

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 13,516	$ 9,379
Securities available for sale and transferred securities:
Net unrealized holding gains on available for sale securities during the period	27,744	9,520
Change in net unrealized loss on securities transferred to held to maturity	0	0
Reclassification adjustment for amortization of unrealized losses on securities transferred to held to maturity	57	282
Reclassification adjustment for net gain on sale of available for sale securities, included in net income	(2,441)	(2,476)
Derivatives:
Change in net unrealized loss on effective cash flow hedge interest rate swap derivatives	(2,244)	0
Pension plans:
Amortization of net actuarial loss, included in net periodic benefit cost	411	531
Amortization of prior service credit, included in net periodic benefit cost	(4)	(4)
Other comprehensive income, before tax	23,523	7,853
Income tax expense related to other items of comprehensive income	(8,233)	(2,749)
Other comprehensive income, net of tax	15,290	5,104
Comprehensive income	$ 28,806	$ 14,483

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Thousands	Total	Common Stock	Paid In Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income (Loss)
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	9,379			9,379
Other comprehensive income	5,104					5,104
Issuance of common stock (12,030 shares in 2016 and 9,983 shares in 2015)	304	12	292
Stock compensation expense	273		273
Tax benefit (expense) related to stock awards	4		4
Net issuance of common stock under employee stock plans	53	4	60	(11)
Cash dividends paid on common stock ($0.23 per share in 2016 and 2015)	(5,546)			(5,546)
Balance at Mar. 31, 2015	434,814	33,239	390,515	59,218	(37,692)	(10,466)
Balance at Dec. 31, 2015	444,062	34,832	424,078	41,527	(37,692)	(18,683)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	13,516			13,516
Other comprehensive income	15,290					15,290
Issuance of common stock (12,030 shares in 2016 and 9,983 shares in 2015)	314	15	299
Purchase of common stock (443,426 shares)	(10,199)				(10,199)
Stock compensation expense	355		355
Tax benefit (expense) related to stock awards	(12)		(12)
Net issuance of common stock under employee stock plans	24	6	33	(15)
Cash dividends paid on common stock ($0.23 per share in 2016 and 2015)	(5,774)			(5,774)
Balance at Mar. 31, 2016	$ 457,576	$ 34,853	$ 424,753	$ 49,254	$ (47,891)	$ (3,393)

CONSOLIDATED STATEMENTS OF CHA7

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (UNAUDITED) (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Issuance of common stock (in shares)	12,030	9,983
Dividends paid on common stock (in dollars per shares)	$ 0.23	$ 0.23
Purchase of common stock (in shares)	443,426

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
OPERATING ACTIVITIES:
Net income	$ 13,516	$ 9,379
Adjustments to reconcile net income to net cash provided by operations:
Depreciation and net amortization	2,169	2,123
Securities premium amortization (discount accretion), net	4,510	5,264
Accretion of loan (discounts) premium amortization, net	(799)	(565)
Provision for loan losses	2,316	3,848
Stock compensation expense	355	273
Deferred Income Tax Expense (Benefit)	(812)	(1,535)
Tax expense (benefit) related to stock awards	12	(4)
Net gain on sale of securities available for sale	(2,441)	(2,476)
Net (gain) loss on premises and equipment	(19)	138
Gross proceeds from sales of loans held for sale	17,944	15,176
Gross originations of loans held for sale	(19,104)	(16,373)
Net loss on other real estate owned	152	272
Net change in:
Interest receivable	6,152	5,792
Other assets	590	3,564
Interest payable	291	(66)
Other liabilities	1,243	(3,142)
Net cash provided by operating activities	26,075	21,668
Securities held to maturity:
Purchases	(18,922)	0
Maturities, calls and principal repayments	5,168	4,061
Securities available for sale:
Purchases	(135,648)	(279,911)
Sales	251,976	285,326
Maturities, calls and principal repayments	47,407	77,202
Proceeds from redemption of FHLB stock	3,644	0
Purchases of FHLB stock and other investments	(171)	(20)
Net loans originated	(11,420)	6,266
Purchases of premises and equipment	(1,648)	(1,223)
Proceeds from sales of premises and equipment	50	3
Proceeds from sales of other real estate owned	483	548
Proceeds from sales of repossessed assets	311	1,088
Net cash provided by investing activities	141,230	93,340
FINANCING ACTIVITIES:
Net change in deposits	164,249	121,246
Net increase (decrease) in federal funds purchased and repurchase agreements	72	(2,110)
Proceeds from FHLB advances	2,916,882	5,227,768
Repayment of FHLB advances	(3,245,382)	(5,434,204)
Tax (expense) benefit related to stock awards	(12)	4
Net issuance of common stock under employee stock plan	24	53
Purchase of common stock	(10,199)	0
Proceeds from the issuance of common stock	314	304
Cash dividends paid	(5,774)	(5,546)
Net cash used in financing activities	(179,826)	(92,485)
Net (decrease) increase in cash and cash equivalents	(12,521)	22,523
Cash and cash equivalents at beginning of period	80,975	84,655
Cash and cash equivalents at end of period	68,454	107,178
SUPPLEMENTAL DISCLOSURES FOR CASH FLOW INFORMATION:
Interest paid	6,104	4,881
Income taxes paid	0	0
SUPPLEMENTAL DISCLOSURES OF NONCASH INVESTING AND FINANCING ACTIVITIES:
Loans transferred to other repossessed assets and real estate through foreclosure	465	674
Adjustment to pension liability	(407)	(527)
Unsettled trades to purchase securities	(23,920)	(13,096)
Unsettled trades to sell securities	$ 15,039	$ 1,792

Summary of Significant Accounti

Summary of Significant Accounting and Reporting Policies	3 Months Ended
	Mar. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation and Significant Accounting Policies [Text Block]	Summary of Significant Accounting and Reporting Policies Basis of Presentation In this report, the words “the Company,” “we,” “us,” and “our” refer to the combined entities of Southside Bancshares, Inc. and its subsidiaries. The words “Southside” and “Southside Bancshares” refer to Southside Bancshares, Inc. The words “Southside Bank” and “the Bank” refer to Southside Bank. “Omni” refers to OmniAmerican Bancorp, Inc., a bank holding company acquired by Southside on December 17, 2014. “SFG” refers to SFG Finance, LLC (formerly Southside Financial Group, LLC), which was a wholly-owned subsidiary of the Bank that was dissolved in April 2015. The consolidated balance sheet as of March 31, 2016 , and the related consolidated statements of income, comprehensive income, changes in shareholders’ equity, cash flows and notes to the financial statements for the three- month periods ended March 31, 2016 and 2015 are unaudited; in the opinion of management, all adjustments necessary for a fair statement of such financial statements have been included. Such adjustments consisted only of normal recurring items. All significant intercompany accounts and transactions are eliminated in consolidation. The preparation of these consolidated financial statements in conformity with U.S. generally accepted accounting principles (“GAAP”) requires the use of management’s estimates. These estimates are subjective in nature and involve matters of judgment. Actual amounts could differ from these estimates. Certain prior period amounts have been reclassified to conform to current year presentation and had no impact on net income, equity or cash flows. Interim results are not necessarily indicative of results for a full year. These financial statements should be read in conjunction with the financial statements and notes thereto in our Annual Report on Form 10-K for the year ended December 31, 2015 . For a description of our significant accounting and reporting policies, refer to “Note 1- Summary of Significant Accounting and Reporting Policies” in our consolidated financial statements in our Annual Report on Form 10-K for the year ended December 31, 2015 . The accounting and reporting policies we follow with respect to our derivative instruments and hedging activities are presented below. Derivative Financial Instruments and Hedging Activities Derivative financial instruments are carried on the consolidated balance sheets as other assets or other liabilities, as applicable, at estimated fair value. The accounting for changes in the fair value (i.e., gains or losses) of a derivative financial instrument is determined by whether it has been designated and qualifies as part of a hedging relationship and, further, by the type of hedging relationship. We present derivative financial instruments at fair value in the consolidated balance sheets on a net basis when a right of offset exists, based on transactions with a single counterparty and any cash collateral paid to and/or received from that counterparty for derivative contracts that are subject to legally enforceable master netting arrangements. For derivative instruments that are designated and qualify as cash flow hedges (i.e., hedging the exposure to variability in expected future cash flows that is attributable to a particular risk), the effective portion of the gain or loss on the derivative instrument is reported as a component of other comprehensive income and reclassified into earnings in the same period or periods during which the hedged transaction affects earnings. The remaining gain or loss on the derivative instrument in excess of the cumulative change in the present value of future cash flows of the hedged item (i.e., the ineffective portion), if any, is recognized in current earnings during the period of change. For derivative instruments not designated as hedging instruments, the gain or loss is recognized in current earnings during the period of change. For derivatives designated as hedging instruments at inception, statistical regression analysis is used at inception and for each reporting period thereafter to assess whether the derivative used has been and is expected to be highly effective in offsetting changes in the fair value or cash flows of the hedged item. All components of each derivative instrument’s gain or loss are included in the assessment of hedge effectiveness. Net hedge ineffectiveness is recorded in “other noninterest income” on the consolidated statements of income. Further information on our derivative instruments and hedging activities is included in “Note 9 - Derivative Financial Instruments and Hedging Activities.” Accounting Pronouncements In February 2016, the FASB issued ASU 2016-02, “Leases (Topic 842).” ASU 2016-02 requires a lessee to recognize assets and liabilities for leases with lease terms of more than 12 months. Consistent with current GAAP, the recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee primarily will depend on its classification as a finance or operating lease. However, unlike current GAAP which requires only capital leases to be recognized on the balance sheet, the new ASU will require both types of leases to be recognized on the balance sheet. ASU 2016-02 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. Early adoption is permitted. We have not yet selected a transition method nor have we determined the impact of adoption on our consolidated financial statements. In March 2016, the FASB issued ASU 2016-09, “Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting.” ASU 2016-09 simplifies several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification in the statement of cash flows. The ASU requires that all excess tax benefits and tax deficiencies be recognized as income tax expense or benefit in the income statement and should be classified along with other income tax cash flows as an operating activity instead of a financing activity as currently required under GAAP. The ASU also simplifies accounting for forfeitures by allowing an entity to make an entity-wide accounting policy election either to estimate the number of forfeitures expected to occur or to recognize the effects of forfeitures when they occur in compensation cost. Additionally, cash paid by an employer when directly withholding shares for tax-withholding purposes should be classified as a financing activity, and to qualify for equity classification, an employer can now withhold up to the maximum statutory tax rate instead of the minimum statutory tax rate as currently required by GAAP. ASU 2016-09 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2016. Early adoption is permitted. We have not yet selected a transition method nor have we determined the impact of adoption on our consolidated financial statements.

Acquisitions

Acquisitions	3 Months Ended
	Mar. 31, 2016
Business Combinations [Abstract]
Schedule of Business Acquisitions, by Acquisition [Table Text Block]	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 total merger consideration for the Omni merger was $298.3 million . The operations of Omni were merged into ours as of the date of the acquisition. The fair value of assets acquired, adjusted for subsequent measurement period adjustments, excluding goodwill, totaled $1.36 billion , including total loans of $763.5 million and total investment securities of $428.4 million . Total fair value of the liabilities assumed, adjusted for subsequent measurement period adjustments, totaled $1.13 billion , including deposits of $801.3 million . We recognized $69.5 million in goodwill associated with the Omni acquisition. The goodwill resulting from the acquisition represents consideration paid in excess of the net assets acquired and 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. We recognized a core deposit intangible of $8.6 million in connection with the Omni acquisition, which will be amortized using an accelerated method over a 10 year period consistent with expected future cash flows. The Omni acquisition 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. For more information concerning the fair value of the assets acquired and liabilities assumed in relation to the acquisition of Omni, see “Note 2 - Acquisition” in our Annual Report on Form 10-K for the year ended December 31, 2015. The following table reflects our goodwill for the periods presented (in thousands). March 31, 2016 December 31, 2015 Goodwill $ 91,520 $ 91,520

Earnings Per Share

Earnings Per Share	3 Months Ended
	Mar. 31, 2016
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share Earnings per share on a basic and diluted basis have been calculated as follows (in thousands, except per share amounts): Three Months Ended 2016 2015 Basic and Diluted Earnings: Net income $ 13,516 $ 9,379 Basic weighted-average shares outstanding 25,186 25,322 Add: Stock awards 66 81 Diluted weighted-average shares outstanding 25,252 25,403 Basic Earnings Per Share: $ 0.54 $ 0.37 Diluted Earnings Per Share: $ 0.54 $ 0.37 For the three- month periods ended March 31, 2016 and 2015 , there were approximately 95,000 and 10,000 anti-dilutive shares, respectively.

Accumulated Other Comprehensive

Accumulated Other Comprehensive (Loss) Income	3 Months Ended
	Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive (Loss) Income	Accumulated Other Comprehensive (Loss) Income The changes in accumulated other comprehensive (loss) income by component are as follows (in thousands): Three Months Ended March 31, 2016 Pension Plans Unrealized Gains (Losses) on Securities Unrealized Gains (Losses) on Derivatives Net Prior Net Gain (Loss) Total Beginning balance, net of tax $ (239 ) $ — $ (44 ) $ (18,400 ) $ (18,683 ) Other comprehensive (loss) income: Other comprehensive income (loss) before reclassifications 27,744 (2,244 ) — — 25,500 Reclassified from accumulated other comprehensive income (2,384 ) — (4 ) 411 (1,977 ) Income tax (expense) benefit (8,876 ) 785 1 (143 ) (8,233 ) Net current-period other comprehensive income (loss), net of tax 16,484 (1,459 ) (3 ) 268 15,290 Ending balance, net of tax $ 16,245 $ (1,459 ) $ (47 ) $ (18,132 ) $ (3,393 ) Three Months Ended March 31, 2015 Pension Plans Unrealized Gains (Losses) on Securities Unrealized Gains (Losses) on Derivatives Net Prior Service (Cost) Credit Net Gain (Loss) Total Beginning balance, net of tax $ 6,238 $ — $ 7 $ (21,815 ) $ (15,570 ) Other comprehensive (loss) income: Other comprehensive income before reclassifications 9,520 — — — 9,520 Reclassified from accumulated other comprehensive income (2,194 ) — (4 ) 531 (1,667 ) Income tax (expense) benefit (2,564 ) — 1 (186 ) (2,749 ) Net current-period other comprehensive income (loss), net of tax 4,762 — (3 ) 345 5,104 Ending balance, net of tax $ 11,000 $ — $ 4 $ (21,470 ) $ (10,466 ) The reclassifications out of accumulated other comprehensive loss into net income are presented below (in thousands): Three Months Ended 2016 2015 Unrealized losses on securities transferred to held to maturity: Amortization of unrealized losses (1) $ (57 ) $ (282 ) Tax benefit 20 99 Net of tax (37 ) (183 ) Unrealized gains and losses on available for sale securities: Realized net gain on sale of securities (2) $ 2,441 $ 2,476 Tax expense (854 ) (867 ) Net of tax 1,587 1,609 Amortization of pension plan: Net actuarial loss (3) $ (411 ) $ (531 ) Prior service credit (3) 4 4 Total before tax (407 ) (527 ) Tax benefit 142 185 Net of tax (265 ) (342 ) Total reclassifications for the period, net of tax $ 1,285 $ 1,084 (1) Included in interest income on the consolidated statements of income. (2) Listed as net gain on sale of securities available for sale on the consolidated statements of income. (3) These accumulated other comprehensive income components are included in the computation of net periodic pension cost (income) presented in “Note 8 - Employee Benefit Plans.”

Securities

Securities	3 Months Ended
	Mar. 31, 2016
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 March 31, 2016 and December 31, 2015 are reflected in the tables below (in thousands): March 31, 2016 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: State and Political Subdivisions $ 270,091 $ 10,172 $ 471 $ 279,792 $ — $ — $ 279,792 Other Stocks and Bonds 12,774 80 45 12,809 — — 12,809 Other Equity Securities 6,048 52 — 6,100 — — 6,100 Mortgage-backed Securities: (1) Residential 553,121 12,042 153 565,010 — — 565,010 Commercial 456,552 12,118 — 468,670 — — 468,670 Total $ 1,298,586 $ 34,464 $ 669 $ 1,332,381 $ — $ — $ 1,332,381 HELD TO MATURITY Investment Securities: State and Political Subdivisions $ 387,936 $ 4,480 $ 9,094 $ 383,322 $ 17,387 $ 1,179 $ 399,530 Mortgage-backed Securities: (1) Residential 34,187 — 44 34,143 2,380 1 36,522 Commercial 371,258 1,192 5,336 367,114 14,942 — 382,056 Total $ 793,381 $ 5,672 $ 14,474 $ 784,579 $ 34,709 $ 1,180 $ 818,108 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 (1) All mortgage-backed securities issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises. From time to time, we may transfer securities from available for sale (“AFS”) to held to maturity (“HTM”) due to overall balance sheet strategies. Our management has the current intent and ability to hold the transferred securities until maturity. Any net unrealized gain or loss on the transferred securities included in accumulated other comprehensive income at the time of transfer will be amortized over the remaining life of the underlying security as an adjustment of the yield on those securities. AFS securities transferred with losses included in accumulated other comprehensive income continue to be included in management’s assessment for other-than-temporary impairment for each individual security. There were no securities transferred from AFS to HTM during the three months ended March 31, 2016 . The following tables represent the fair value and unrealized loss on securities as of March 31, 2016 and December 31, 2015 (in thousands): As of March 31, 2016 Less Than 12 Months More Than 12 Months Total Fair Value Unrealized Loss Fair Value Unrealized Loss Fair Value Unrealized Loss AVAILABLE FOR SALE Investment Securities: State and Political Subdivisions $ 6,134 $ 16 $ 17,650 $ 455 $ 23,784 $ 471 Other Stocks and Bonds 2,955 45 — — 2,955 45 Mortgage-backed Securities: Residential 57,543 147 2,699 6 60,242 153 Total $ 66,632 $ 208 $ 20,349 $ 461 $ 86,981 $ 669 HELD TO MATURITY Investment Securities: State and Political Subdivisions $ 4,197 $ 40 $ 47,304 $ 1,139 $ 51,501 $ 1,179 Mortgage-backed Securities: Residential 540 1 — — 540 1 Total $ 4,737 $ 41 $ 47,304 $ 1,139 $ 52,041 $ 1,180 As of December 31, 2015 Less Than 12 Months More Than 12 Months Total Fair Value Unrealized Fair Value Unrealized Fair Value Unrealized 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 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. We consider 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 March 31, 2016 . The majority of the unrealized loss positions are comprised of highly rated municipal securities and U.S. Agency mortgage- backed securities (“MBS”) where the unrealized loss is a direct result of the change in interest rates and spreads. 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 March 31, 2016 . Interest income recognized on securities for the periods presented (in thousands): Three Months Ended 2016 2015 U.S. Treasury $ 127 $ 116 U.S. Government Agency Debentures — 32 State and Political Subdivisions 5,355 5,870 Other Stocks and Bonds 58 52 Other Equity Securities 29 32 Mortgage-backed Securities 9,391 8,462 Total interest income on securities $ 14,960 $ 14,564 Of the approximately $2.4 million in net securities gains from the AFS portfolio for the three months ended March 31, 2016 , there were $2.6 million in realized gains and $202,000 in realized losses. Of the $2.5 million in net securities gains from the AFS portfolio for the three months ended March 31, 2015 , there were $2.5 million in realized gains and $54,000 in realized losses. There were no sales from the HTM portfolio during the three months ended March 31, 2016 or 2015 . We calculate realized gains and losses on sales of securities under the specific identification method. The amortized cost, carrying value and fair value of securities at March 31, 2016 , 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 security 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. March 31, 2016 Amortized Cost Fair Value AVAILABLE FOR SALE (in thousands) Investment Securities: Due in one year or less $ 18,483 $ 18,576 Due after one year through five years 21,036 22,078 Due after five years through ten years 30,220 31,318 Due after ten years 213,126 220,629 282,865 292,601 Mortgage-backed Securities and Other Equity Securities: 1,015,721 1,039,780 Total $ 1,298,586 $ 1,332,381 March 31, 2016 Carrying Value Fair Value HELD TO MATURITY (in thousands) Investment Securities: Due in one year or less $ 5,233 $ 5,144 Due after one year through five years 22,189 22,649 Due after five years through ten years 77,787 80,387 Due after ten years 278,113 291,350 383,322 399,530 Mortgage-backed Securities: 401,257 418,578 Total $ 784,579 $ 818,108 Investment and MBS with carrying values of $1.13 billion and $1.33 billion were pledged as of March 31, 2016 and December 31, 2015 , respectively, to collateralize Federal Home Loan Bank of Dallas, (“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	3 Months Ended
	Mar. 31, 2016
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): March 31, 2016 December 31, 2015 Real Estate Loans: Construction $ 464,750 $ 438,247 1-4 Family Residential 644,826 655,410 Commercial 657,962 635,210 Commercial Loans 233,857 242,527 Municipal Loans 286,217 288,115 Loans to Individuals 155,619 172,244 Total Loans (1) 2,443,231 2,431,753 Less: Allowance for Loan Losses 21,799 19,736 Net Loans $ 2,421,432 $ 2,412,017 (1) Includes approximately $525.4 million and $581.1 million of loans acquired with the Omni acquisition as of March 31, 2016 and December 31, 2015 , respectively. The allowance for loan loss recorded on acquired loans totaled $519,000 and $629,000 as of March 31, 2016 and December 31, 2015 , 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 $582.8 million of commercial real estate loans, $69.9 million of loans secured by multi-family properties and $5.3 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. 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 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 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. 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 occur 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): Three Months Ended March 31, 2016 Real Estate Construction 1-4 Family Residential Commercial Commercial Loans Municipal Loans Loans to Individuals Total Balance at beginning of period $ 4,350 $ 2,595 $ 4,577 $ 6,596 $ 725 $ 893 $ 19,736 Provision (reversal) for loan losses (42 ) (551 ) (116 ) 2,620 (5 ) 410 2,316 Loans charged off — (19 ) — (273 ) — (848 ) (1,140 ) Recoveries of loans charged off 269 130 6 21 — 461 887 Balance at end of period $ 4,577 $ 2,155 $ 4,467 $ 8,964 $ 720 $ 916 $ 21,799 Three Months Ended March 31, 2015 Real Estate Construction 1-4 Family Residential Commercial Commercial Loans Municipal Loans Loans to Individuals Total Balance at beginning of period (1) $ 2,456 $ 2,822 $ 3,025 $ 3,279 $ 716 $ 994 $ 13,292 Provision (reversal) for loan losses 275 573 269 2,065 108 558 3,848 Loans charged off — (6 ) — (57 ) — (1,023 ) (1,086 ) Recoveries of loans charged off 43 11 66 29 — 723 872 Balance at end of period $ 2,774 $ 3,400 $ 3,360 $ 5,316 $ 824 $ 1,252 $ 16,926 (1) Loans acquired with the Omni acquisition were measured at fair value on December 17, 2014 with no carryover of allowance for loan loss. The following tables present the balance in the allowance for loan losses by portfolio segment based on impairment method (in thousands): As of March 31, 2016 Real Estate Construction 1-4 Family Residential Commercial Commercial Loans Municipal Loans Loans to Individuals Total Ending balance – individually evaluated for impairment (1) $ 31 $ 23 $ 56 $ 6,422 $ 13 $ 92 $ 6,637 Ending balance – collectively evaluated for impairment 4,546 2,132 4,411 2,542 707 824 15,162 Balance at end of period $ 4,577 $ 2,155 $ 4,467 $ 8,964 $ 720 $ 916 $ 21,799 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 (1) There was approximately $519,000 and $629,000 of allowance for loan losses associated with purchased credit impaired (“PCI”) loans as of March 31, 2016 and December 31, 2015 , respectively. The following tables present the recorded investment in loans by portfolio segment based on impairment method (in thousands): March 31, 2016 Real Estate Construction 1-4 Family Residential Commercial Commercial Loans Municipal Loans Loans to Individuals Total Loans individually evaluated for impairment $ 688 $ 1,730 $ 5,651 $ 14,650 $ 637 $ 235 $ 23,591 Loans collectively evaluated for impairment 463,842 636,151 649,297 211,096 285,580 155,194 2,401,160 Purchased credit impaired loans 220 6,945 3,014 8,111 — 190 18,480 Total ending loan balance $ 464,750 $ 644,826 $ 657,962 $ 233,857 $ 286,217 $ 155,619 $ 2,443,231 December 31, 2015 Real Estate Construction 1-4 Family Residential Commercial Commercial Loans Municipal Loans Loans to 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 loan balance $ 438,247 $ 655,410 $ 635,210 $ 242,527 $ 288,115 $ 172,244 $ 2,431,753 The following tables set forth loans by credit quality indicator for the periods presented (in thousands): March 31, 2016 Pass Pass Watch Special Mention (1) Substandard (1) Doubtful (1) Total Real Estate Loans: Construction $ 452,660 $ — $ 1,943 $ 10,031 $ 116 $ 464,750 1-4 Family Residential 634,028 1,390 1,622 3,943 3,843 644,826 Commercial 643,504 621 113 12,512 1,212 657,962 Commercial Loans 197,689 1,148 4,717 10,263 20,040 233,857 Municipal Loans 284,563 — 1,017 637 — 286,217 Loans to Individuals 153,923 1 — 436 1,259 155,619 Total $ 2,366,367 $ 3,160 $ 9,412 $ 37,822 $ 26,470 $ 2,443,231 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 and $3.6 million substandard at both March 31, 2016 and December 31, 2015 . Includes PCI loans comprised of $9.8 million and $9.9 million doubtful as of March 31, 2016 and December 31, 2015 , respectively. 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) $ 21,927 $ 20,526 Accruing loans past due more than 90 days (1) 7 3 Restructured loans (2) 11,762 11,143 Other real estate owned 265 744 Repossessed assets 85 64 Total Nonperforming Assets $ 34,046 $ 32,480 (1) Excludes PCI loans measured at fair value at acquisition. (2) Includes $7.4 million and $7.5 million in PCI loans restructured as of March 31, 2016 and December 31, 2015 , respectively. 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 $2.9 million and $67,000 loans secured by 1-4 family residential properties for which formal foreclosure proceedings were in process as of March 31, 2016 and December 31, 2015 , respectively. The following table sets forth the recorded investment in nonaccrual loans by class of loans for the periods presented (in thousands): Nonaccrual Loans (1) March 31, 2016 December 31, 2015 Real Estate Loans: Construction $ 134 $ 508 1-4 Family Residential 1,410 1,847 Commercial 4,731 2,816 Commercial Loans 14,207 13,896 Loans to Individuals 1,445 1,459 Total $ 21,927 $ 20,526 (1) Excludes PCI loans measured at fair value at acquisition. Accruing loans past due more than 90 days were not significant at March 31, 2016 and December 31, 2015 . 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): March 31, 2016 Unpaid Contractual Principal Balance Recorded Investment With Allowance Related Allowance for Loan Losses Real Estate Loans: Construction $ 690 $ 688 $ 31 1-4 Family Residential 1,823 1,730 23 Commercial 6,669 6,509 56 Commercial Loans 30,239 21,685 6,422 Municipal Loans 637 637 13 Loans to Individuals 269 235 92 Total (1) $ 40,327 $ 31,484 $ 6,637 (1) Includes $7.9 million of PCI loans that experienced deterioration in credit quality subsequent to the acquisition date. 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 $8.0 million of PCI loans that experienced deterioration in credit quality subsequent to the acquisition date. There were no impaired loans recorded without an allowance as of March 31, 2016 or December 31, 2015 . The following tables present the aging of the recorded investment in past due loans by class of loans (in thousands): March 31, 2016 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 $ 1,156 $ — $ 93 $ 1,249 $ 463,501 $ 464,750 1-4 Family Residential 3,622 39 716 4,377 640,449 644,826 Commercial 330 35 1,318 1,683 656,279 657,962 Commercial Loans 844 2,899 54 3,797 230,060 233,857 Municipal Loans — — — — 286,217 286,217 Loans to Individuals 1,811 208 253 2,272 153,347 155,619 Total $ 7,763 $ 3,181 $ 2,434 $ 13,378 $ 2,429,853 $ 2,443,231 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 (1) Includes PCI loans measured at fair value at acquisition. 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): Three Months Ended March 31, 2016 March 31, 2015 Average Recorded Investment (1) Interest Income Recognized (1) Average Recorded (1) Interest Income Recognized (1) Real Estate Loans: Construction $ 454 $ 6 $ 2,401 $ 23 1-4 Family Residential 1,865 14 4,000 17 Commercial 5,488 21 1,945 13 Commercial Loans 21,675 167 4,530 8 Municipal Loans 637 9 761 10 Loans to Individuals 247 2 462 — Total $ 30,366 $ 219 $ 14,099 $ 71 (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 March 31, 2016 and 2015 of loans considered to be TDRs that were restructured during the periods presented (dollars in thousands): Three Months Ended March 31, 2016 Extend Amortization Period Interest Rate Reductions Combination (1) Total Modifications Number of Loans Real Estate Loans: Construction $ 554 $ — $ — $ 554 1 Commercial 2,118 — — 2,118 1 Commercial Loans 1,176 — — 1,176 4 Total $ 3,848 $ — $ — $ 3,848 6 Three Months Ended March 31, 2015 Extend Amortization Period Interest Rate Reductions Combination (1) Total Modifications Number of Loans Real Estate Loans: 1-4 Family Residential $ — $ — $ 266 $ 266 2 Commercial 31 — — 31 1 Commercial Loans — — 762 762 1 Loans to Individuals — — 27 27 2 Total $ 31 $ — $ 1,055 $ 1,086 6 (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 restructured as TDRs during the three months ended March 31, 2016 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 three months ended March 31, 2016 and 2015 were not significant. 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 default for TDRs is recognized when the borrower is 90 days or more past due. For the three months ended March 31, 2016 , there were $1.4 million of TDRs in default. For the three months ended March 31, 2015 , there were no material TDRs in default. Payment defaults for TDRs did not significantly impact the determination of the allowance for loan loss in either period presented. At March 31, 2016 and 2015 , there were no commitments to lend additional funds to borrowers whose terms had been modified in TDRs. Purchased Credit Impaired Loans The following table presents the outstanding principal balance and carrying value for PCI loans for the periods presented (in thousands): March 31, 2016 December 31, 2015 Outstanding principal balance $ 27,005 $ 27,644 Carrying amount $ 18,480 $ 18,620 The following table presents the changes of the accretable yield during the periods for PCI loans (in thousands): Three Months Ended 2016 2015 Balance at beginning of period $ 2,493 $ 1,820 Additions — — Reclassifications from Nonaccretable Discount 443 — Accretion (594 ) (524 ) Balance at end of period $ 2,342 $ 1,296

Long-term Obligations

Long-term Obligations	3 Months Ended
	Mar. 31, 2016
Debt Disclosure [Abstract]
Long-term Obligations	Long-term Obligations Long-term obligations are summarized as follows (in thousands): March 31, December 31, FHLB Advances (1) $ 561,990 $ 502,281 Long-term Debt (2) Southside Statutory Trust III Due 2033 (3) 20,619 20,619 Southside Statutory Trust IV Due 2037 (4) 23,196 23,196 Southside Statutory Trust V Due 2037 (5) 12,887 12,887 Magnolia Trust Company I Due 2035 (6) 3,609 3,609 Total Long-term Debt 60,311 60,311 Total Long-term Obligations $ 622,301 $ 562,592 (1) At March 31, 2016 , the weighted average cost of these advances was 1.17% . Long-term FHLB Advances have maturities ranging from April 2017 through July 2028 . (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. (3) This debt carries an adjustable rate of 3.57085% through June 29, 2016 and adjusts quarterly at a rate equal to three-month LIBOR plus 294 basis points . (4) This debt carried an adjustable rate of 1.9156% through April 29, 2016 and adjusts quarterly at a rate equal to three-month LIBOR plus 130 basis points . (5) This debt carries an adjustable rate of 2.88385% through June 14, 2016 and adjusts quarterly at a rate equal to three-month LIBOR plus 225 basis points . (6) This debt carries an adjustable rate of 2.4182% through May 22, 2016 and adjusts quarterly at a rate equal to three-month LIBOR plus 180 basis points . During the fourth quarter of 2015 and continuing into the first quarter of 2016 , we entered into various variable rate advance agreements with the FHLB . At March 31, 2016 , these agreements were $190.0 million with rates ranging from one-month LIBOR plus 0.17% to one-month LIBOR plus 0.277% . In addition, we entered into various interest rate swap contracts that are treated as cash flow hedges under ASC 815 that effectively converted the variable rate advances to fixed interest rates ranging from 0.932% to 1.647% and ranging from four years to nine years. The cash flows of the swaps 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. Refer to “Note 9 - Derivative Financial Instruments and Hedging Activities” in our consolidated financial statements included in this report for a detailed description of our hedging policy and methodology related to derivative instruments.

Employee Benefit Plans

Employee Benefit Plans	3 Months Ended
	Mar. 31, 2016
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Employee Benefit Plans	Employee Benefit Plans The components of net periodic benefit cost (income) are as follows (in thousands): Three Months Ended March 31, Defined Benefit Defined Benefit Pension Plan Acquired Restoration 2016 2015 2016 2015 2016 2015 Service cost $ 368 $ 476 $ — $ — $ 47 $ 73 Interest cost 917 857 53 59 135 135 Expected return on assets (1,354 ) (1,422 ) (67 ) (73 ) — — Net loss amortization 358 383 — — 53 148 Prior service (credit) cost amortization (6 ) (6 ) — — 2 2 Special and contractual termination benefits 1,520 — — — — — Net periodic benefit cost (income) $ 1,803 $ 288 $ (14 ) $ (14 ) $ 237 $ 358

Derivative Financial Instrument

Derivative Financial Instruments and Hedging Activities Derivatives Financial Instruments and Hedging Activites	3 Months Ended
	Mar. 31, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments and Hedging Activities Disclosure	Derivative Financial Instruments and Hedging Activities Our hedging policy allows the use of interest rate derivative instruments to manage our exposure to interest rate risk or hedge specified assets and liabilities. These instruments may include interest rate swaps and interest rate caps and floors. All derivative instruments are carried on the balance sheet at their estimated fair value and are recorded in other assets or other liabilities, as appropriate. Derivative instruments may be designated as cash flow hedges of variable rate assets or liabilities, or as forecasted transactions. Derivative instruments designated as cash flow hedges are recorded in accumulated other comprehensive income to the extent they are effective. The amount recorded in other comprehensive income is reclassified to earnings in the same periods as the hedged cash flows impact earnings. The ineffective portion of changes in fair value is reported in current earnings. During the fourth quarter of 2015 and continuing into the first quarter of 2016, we entered into certain interest rate swap contracts on specific variable-rate advance agreements with the FHLB having a total notional amount of $190.0 million at March 31, 2016 . These interest rate swap contracts were designated as hedging instruments in cash flow hedges under ASC 815. The objective of the interest rate swap contracts is to manage the expected future cash flows on our $190.0 million of variable-rate advance agreements with the FHLB. 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. At March 31, 2016 , net derivative liabilities included $1.7 million of cash collateral paid to the counterparty related to instruments executed with the same counterparty under a master netting agreement. The notional amounts of the derivative instruments represent the contractual cash flows pertaining to the underlying agreements. These amounts are not exchanged and are not reflected in the consolidated balance sheets. The fair value of the interest rate swaps are presented at net in other assets and other liabilities when a right of offset exists, based on transactions with a single counterparty that are subject to a legally enforceable master netting agreement. The following tables present the notional and estimated fair value amount of derivative positions outstanding for the periods presented (in thousands): March 31, 2016 December 31, 2015 Estimated Fair Value Estimated Fair Value Notional Amount (1) Asset Derivative Liability Derivative Notional Amount (1) Asset Derivative Liability Derivative Derivatives designated as hedging instruments Interest rate contracts: Swaps-Cash Flow Hedge- receive floating/pay fixed $ 190,000 $ 350 $ 2,594 $ 20,000 $ — $ 1 Gross derivatives 350 2,594 — 1 Offsetting derivative assets/liabilities (350 ) (350 ) — — Cash collateral received/posted — (1,740 ) — — Net derivatives included in the consolidated balance sheets (2) $ — $ 504 $ — $ 1 (1) Notional amounts, which represent the extent of involvement in the derivatives market, are used to determine the contractual cash flows required in accordance with the terms of the agreement. These amounts are typically not exchanged, significantly exceed amounts subject to credit or market risk and are not reflected in the consolidated balance sheets. (2) Net derivative assets are included in “other assets” and net derivative liabilities are included in “other liabilities” on the consolidated balance sheets. Included in the fair value of net derivative assets and net derivative liabilities are credit valuation adjustments reflecting counterparty credit risk and our credit risk. The fair value of net derivative liabilities included credit valuation adjustments for our credit exposure of $350,000 at March 31, 2016 . We had no credit exposure at December 31, 2015 . The summarized expected weighted average remaining maturity of the notional amount of interest rate swaps and the weighted average interest rates associated with the amounts expected to be received or paid on interest rate swap agreements are presented below (in thousands): March 31, 2016 December 31, 2015 Weighted Average Weighted Average Notional Amount Remaining Maturity (in years) Receive Rate (1) Pay Rate Notional Amount Remaining Maturity Receive Rate (1) Pay Swaps-Cash Flow Hedge-receive floating/pay fixed Medium-and long-term debt designation $ 190,000 5.9 0.44 % 1.36 % $ 20,000 4.9 0.29 % 1.53 % (1) Variable rates received on pay fixed swaps are based on one-month LIBOR rates in effect at March 31, 2016 and December 31, 2015 .

Fair Value Measurement

Fair Value Measurement	3 Months Ended
	Mar. 31, 2016
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 is not 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 March 31, 2016 and December 31, 2015 , 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 three months ended March 31, 2016 . 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 independent pricing services. 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 services 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 services 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. Derivatives – Derivatives are reported at fair value utilizing Level 2 inputs. We obtain fair value measurements from three sources including an independent pricing service and the counterparty to the derivatives. The fair value measurements consider observable data that may include dealer quotes, market spreads, the U.S. Treasury yield curve, live trading levels, trade execution data, credit information and the derivatives’ terms and conditions, among other things. We review the prices supplied by the sources for reasonableness. In addition, we obtain a basic understanding of their underlying pricing methodology. We validate prices supplied by the sources by comparison to one another. 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 March 31, 2016 and December 31, 2015 . Foreclosed Assets – Foreclosed assets are initially recorded 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 March 31, 2016 and December 31, 2015 , 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 March 31, 2016 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: State and Political Subdivisions $ 279,792 $ — $ 279,792 $ — Other Stocks and Bonds 12,809 — 12,809 — Other Equity Securities 6,100 6,100 — — Mortgage-backed Securities: (1) Residential 565,010 — 565,010 — Commercial 468,670 — 468,670 — Derivative assets: Interest rate swaps 350 — 350 — Total asset recurring fair value measurements $ 1,332,731 $ 6,100 $ 1,326,631 $ — Derivative liabilities: Interest rate swaps $ 2,594 $ — $ 2,594 $ — Total liability recurring fair value measurements $ 2,594 $ — $ 2,594 $ — Nonrecurring fair value measurements Foreclosed assets $ 350 $ — $ — $ 350 Impaired loans (2) 24,847 — — 24,847 Total asset nonrecurring fair value measurements $ 25,197 $ — $ — $ 25,197 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 asset 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 asset nonrecurring fair value measurements $ 25,091 $ — $ — $ 25,091 (1) All mortgage-backed securities are issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises. (2) Impaired loans represent collateral-dependent 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 when 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 amount 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 March 31, 2016 Carrying Total Level 1 Level 2 Level 3 Financial Assets: Cash and cash equivalents $ 68,454 $ 68,454 $ 68,454 $ — $ — Investment securities: Held to maturity, at carrying value 383,322 399,530 — 399,530 — Mortgage-backed securities: Held to maturity, at carrying value 401,257 418,578 — 418,578 — FHLB stock and other investments, at cost 53,051 53,051 — 53,051 — Loans, net of allowance for loan losses 2,421,432 2,404,287 — — 2,404,287 Loans held for sale 4,971 4,971 — 4,971 — Financial Liabilities: Retail deposits $ 3,619,368 $ 3,615,409 $ — $ 3,615,409 $ — Federal funds purchased and repurchase agreements 2,501 2,501 — 2,501 — FHLB advances 819,135 815,742 — 815,742 — Long-term debt 60,311 44,996 — 44,996 — 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 — 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.

Income Taxes Income Taxes (Not

Income Taxes Income Taxes (Notes)	3 Months Ended
	Mar. 31, 2016
Income Tax Disclosure [Abstract]
Income Taxes	The income tax expense included in the accompanying statements of income consists of the following (in thousands): Three Months Ended 2016 2015 Current income tax expense $ 3,785 $ 3,438 Deferred income tax (benefit) expense (812 ) (1,535 ) Income tax expense $ 2,973 $ 1,903 Net deferred tax assets totaled $12.5 million at March 31, 2016 and $19.9 million at December 31, 2015 . No valuation allowance for deferred tax assets was recorded at March 31, 2016 or December 31, 2015 , 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 March 31, 2016 or December 31, 2015 . We recognized income tax expense of $3.0 million , for an effective tax rate of 18.0% , for the three months ended March 31, 2016 , compared to income tax expense of $1.9 million , for an effective tax rate of 16.9% , for the three months ended March 31, 2015 . The higher effective tax rate for the three months ended March 31, 2016 was due to a decrease in tax-exempt income as a percentage of pre-tax income as compared to the same period in 2015 . We file federal income tax returns and certain state tax returns. We are no longer subject to U.S. federal income tax examinations by tax authorities for years before 2012 .

Off-Balance-Sheet Arrangements,

Off-Balance-Sheet Arrangements, Commitments and Contingencies	3 Months Ended
	Mar. 31, 2016
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 $ 530,310 $ 546,660 Standby letters of credit 8,804 7,752 Total $ 539,114 $ 554,412 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. 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 $23.9 million and $19.4 million of unsettled trades to purchase securities at March 31, 2016 and December 31, 2015 , respectively. There were $15.0 million and $9.3 million of unsettled trades to sell securities as of March 31, 2016 and December 31, 2015 , respectively. Deposits . There were no unsettled issuances of brokered CDs at March 31, 2016 or December 31, 2015 . 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.

Summary of Significant Accoun21

Summary of Significant Accounting and Reporting Policies Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2016
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation In this report, the words “the Company,” “we,” “us,” and “our” refer to the combined entities of Southside Bancshares, Inc. and its subsidiaries. The words “Southside” and “Southside Bancshares” refer to Southside Bancshares, Inc. The words “Southside Bank” and “the Bank” refer to Southside Bank. “Omni” refers to OmniAmerican Bancorp, Inc., a bank holding company acquired by Southside on December 17, 2014. “SFG” refers to SFG Finance, LLC (formerly Southside Financial Group, LLC), which was a wholly-owned subsidiary of the Bank that was dissolved in April 2015. The consolidated balance sheet as of March 31, 2016 , and the related consolidated statements of income, comprehensive income, changes in shareholders’ equity, cash flows and notes to the financial statements for the three- month periods ended March 31, 2016 and 2015 are unaudited; in the opinion of management, all adjustments necessary for a fair statement of such financial statements have been included. Such adjustments consisted only of normal recurring items. All significant intercompany accounts and transactions are eliminated in consolidation. The preparation of these consolidated financial statements in conformity with U.S. generally accepted accounting principles (“GAAP”) requires the use of management’s estimates. These estimates are subjective in nature and involve matters of judgment. Actual amounts could differ from these estimates. Certain prior period amounts have been reclassified to conform to current year presentation and had no impact on net income, equity or cash flows. Interim results are not necessarily indicative of results for a full year. These financial statements should be read in conjunction with the financial statements and notes thereto in our Annual Report on Form 10-K for the year ended December 31, 2015 .
Derivative Financial Instruments and Hedging Activities Policy	Derivative Financial Instruments and Hedging Activities Derivative financial instruments are carried on the consolidated balance sheets as other assets or other liabilities, as applicable, at estimated fair value. The accounting for changes in the fair value (i.e., gains or losses) of a derivative financial instrument is determined by whether it has been designated and qualifies as part of a hedging relationship and, further, by the type of hedging relationship. We present derivative financial instruments at fair value in the consolidated balance sheets on a net basis when a right of offset exists, based on transactions with a single counterparty and any cash collateral paid to and/or received from that counterparty for derivative contracts that are subject to legally enforceable master netting arrangements. For derivative instruments that are designated and qualify as cash flow hedges (i.e., hedging the exposure to variability in expected future cash flows that is attributable to a particular risk), the effective portion of the gain or loss on the derivative instrument is reported as a component of other comprehensive income and reclassified into earnings in the same period or periods during which the hedged transaction affects earnings. The remaining gain or loss on the derivative instrument in excess of the cumulative change in the present value of future cash flows of the hedged item (i.e., the ineffective portion), if any, is recognized in current earnings during the period of change. For derivative instruments not designated as hedging instruments, the gain or loss is recognized in current earnings during the period of change. For derivatives designated as hedging instruments at inception, statistical regression analysis is used at inception and for each reporting period thereafter to assess whether the derivative used has been and is expected to be highly effective in offsetting changes in the fair value or cash flows of the hedged item. All components of each derivative instrument’s gain or loss are included in the assessment of hedge effectiveness. Net hedge ineffectiveness is recorded in “other noninterest income” on the consolidated statements of income. Further information on our derivative instruments and hedging activities is included in “Note 9 - Derivative Financial Instruments and Hedging Activities.”
Accounting Pronouncements	Accounting Pronouncements In February 2016, the FASB issued ASU 2016-02, “Leases (Topic 842).” ASU 2016-02 requires a lessee to recognize assets and liabilities for leases with lease terms of more than 12 months. Consistent with current GAAP, the recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee primarily will depend on its classification as a finance or operating lease. However, unlike current GAAP which requires only capital leases to be recognized on the balance sheet, the new ASU will require both types of leases to be recognized on the balance sheet. ASU 2016-02 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. Early adoption is permitted. We have not yet selected a transition method nor have we determined the impact of adoption on our consolidated financial statements. In March 2016, the FASB issued ASU 2016-09, “Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting.” ASU 2016-09 simplifies several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification in the statement of cash flows. The ASU requires that all excess tax benefits and tax deficiencies be recognized as income tax expense or benefit in the income statement and should be classified along with other income tax cash flows as an operating activity instead of a financing activity as currently required under GAAP. The ASU also simplifies accounting for forfeitures by allowing an entity to make an entity-wide accounting policy election either to estimate the number of forfeitures expected to occur or to recognize the effects of forfeitures when they occur in compensation cost. Additionally, cash paid by an employer when directly withholding shares for tax-withholding purposes should be classified as a financing activity, and to qualify for equity classification, an employer can now withhold up to the maximum statutory tax rate instead of the minimum statutory tax rate as currently required by GAAP. ASU 2016-09 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2016. Early adoption is permitted. We have not yet selected a transition method nor have we determined the impact of adoption on our consolidated financial statements.

Acquisitions Acquisitions (Tab

Acquisitions Acquisitions (Tables)	3 Months Ended
	Mar. 31, 2016
Business Combinations [Abstract]
Business Combination, Segment Allocation [Table Text Block]	The following table reflects our goodwill for the periods presented (in thousands). March 31, 2016 December 31, 2015 Goodwill $ 91,520 $ 91,520

Earnings Per Share (Tables)

Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2016
Earnings Per Share [Abstract]
Earnings per share on a basic and diluted basis	Earnings per share on a basic and diluted basis have been calculated as follows (in thousands, except per share amounts): Three Months Ended 2016 2015 Basic and Diluted Earnings: Net income $ 13,516 $ 9,379 Basic weighted-average shares outstanding 25,186 25,322 Add: Stock awards 66 81 Diluted weighted-average shares outstanding 25,252 25,403 Basic Earnings Per Share: $ 0.54 $ 0.37 Diluted Earnings Per Share: $ 0.54 $ 0.37

Accumulated Other Comprehensi24

Accumulated Other Comprehensive (Loss) Income (Tables)	3 Months Ended
	Mar. 31, 2016
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): Three Months Ended March 31, 2016 Pension Plans Unrealized Gains (Losses) on Securities Unrealized Gains (Losses) on Derivatives Net Prior Net Gain (Loss) Total Beginning balance, net of tax $ (239 ) $ — $ (44 ) $ (18,400 ) $ (18,683 ) Other comprehensive (loss) income: Other comprehensive income (loss) before reclassifications 27,744 (2,244 ) — — 25,500 Reclassified from accumulated other comprehensive income (2,384 ) — (4 ) 411 (1,977 ) Income tax (expense) benefit (8,876 ) 785 1 (143 ) (8,233 ) Net current-period other comprehensive income (loss), net of tax 16,484 (1,459 ) (3 ) 268 15,290 Ending balance, net of tax $ 16,245 $ (1,459 ) $ (47 ) $ (18,132 ) $ (3,393 ) Three Months Ended March 31, 2015 Pension Plans Unrealized Gains (Losses) on Securities Unrealized Gains (Losses) on Derivatives Net Prior Service (Cost) Credit Net Gain (Loss) Total Beginning balance, net of tax $ 6,238 $ — $ 7 $ (21,815 ) $ (15,570 ) Other comprehensive (loss) income: Other comprehensive income before reclassifications 9,520 — — — 9,520 Reclassified from accumulated other comprehensive income (2,194 ) — (4 ) 531 (1,667 ) Income tax (expense) benefit (2,564 ) — 1 (186 ) (2,749 ) Net current-period other comprehensive income (loss), net of tax 4,762 — (3 ) 345 5,104 Ending balance, net of tax $ 11,000 $ — $ 4 $ (21,470 ) $ (10,466 )
Reclassifications out of accumulated other comprehensive income	The reclassifications out of accumulated other comprehensive loss into net income are presented below (in thousands): Three Months Ended 2016 2015 Unrealized losses on securities transferred to held to maturity: Amortization of unrealized losses (1) $ (57 ) $ (282 ) Tax benefit 20 99 Net of tax (37 ) (183 ) Unrealized gains and losses on available for sale securities: Realized net gain on sale of securities (2) $ 2,441 $ 2,476 Tax expense (854 ) (867 ) Net of tax 1,587 1,609 Amortization of pension plan: Net actuarial loss (3) $ (411 ) $ (531 ) Prior service credit (3) 4 4 Total before tax (407 ) (527 ) Tax benefit 142 185 Net of tax (265 ) (342 ) Total reclassifications for the period, net of tax $ 1,285 $ 1,084 (1) Included in interest income on the consolidated statements of income. (2) Listed as net gain on sale of securities available for sale on the consolidated statements of income. (3) These accumulated other comprehensive income components are included in the computation of net periodic pension cost (income) presented in “Note 8 - Employee Benefit Plans.”

Securities (Tables)

Securities (Tables)	3 Months Ended
	Mar. 31, 2016
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 March 31, 2016 and December 31, 2015 are reflected in the tables below (in thousands): March 31, 2016 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: State and Political Subdivisions $ 270,091 $ 10,172 $ 471 $ 279,792 $ — $ — $ 279,792 Other Stocks and Bonds 12,774 80 45 12,809 — — 12,809 Other Equity Securities 6,048 52 — 6,100 — — 6,100 Mortgage-backed Securities: (1) Residential 553,121 12,042 153 565,010 — — 565,010 Commercial 456,552 12,118 — 468,670 — — 468,670 Total $ 1,298,586 $ 34,464 $ 669 $ 1,332,381 $ — $ — $ 1,332,381 HELD TO MATURITY Investment Securities: State and Political Subdivisions $ 387,936 $ 4,480 $ 9,094 $ 383,322 $ 17,387 $ 1,179 $ 399,530 Mortgage-backed Securities: (1) Residential 34,187 — 44 34,143 2,380 1 36,522 Commercial 371,258 1,192 5,336 367,114 14,942 — 382,056 Total $ 793,381 $ 5,672 $ 14,474 $ 784,579 $ 34,709 $ 1,180 $ 818,108 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 (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 tables represent the fair value and unrealized loss on securities as of March 31, 2016 and December 31, 2015 (in thousands): As of March 31, 2016 Less Than 12 Months More Than 12 Months Total Fair Value Unrealized Loss Fair Value Unrealized Loss Fair Value Unrealized Loss AVAILABLE FOR SALE Investment Securities: State and Political Subdivisions $ 6,134 $ 16 $ 17,650 $ 455 $ 23,784 $ 471 Other Stocks and Bonds 2,955 45 — — 2,955 45 Mortgage-backed Securities: Residential 57,543 147 2,699 6 60,242 153 Total $ 66,632 $ 208 $ 20,349 $ 461 $ 86,981 $ 669 HELD TO MATURITY Investment Securities: State and Political Subdivisions $ 4,197 $ 40 $ 47,304 $ 1,139 $ 51,501 $ 1,179 Mortgage-backed Securities: Residential 540 1 — — 540 1 Total $ 4,737 $ 41 $ 47,304 $ 1,139 $ 52,041 $ 1,180 As of December 31, 2015 Less Than 12 Months More Than 12 Months Total Fair Value Unrealized Fair Value Unrealized Fair Value Unrealized 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
Interest income recognized on securities	Interest income recognized on securities for the periods presented (in thousands): Three Months Ended 2016 2015 U.S. Treasury $ 127 $ 116 U.S. Government Agency Debentures — 32 State and Political Subdivisions 5,355 5,870 Other Stocks and Bonds 58 52 Other Equity Securities 29 32 Mortgage-backed Securities 9,391 8,462 Total interest income on securities $ 14,960 $ 14,564
Amortized cost, carrying value and fair value of securities presented by contractual maturity	The amortized cost, carrying value and fair value of securities at March 31, 2016 , 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 security 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. March 31, 2016 Amortized Cost Fair Value AVAILABLE FOR SALE (in thousands) Investment Securities: Due in one year or less $ 18,483 $ 18,576 Due after one year through five years 21,036 22,078 Due after five years through ten years 30,220 31,318 Due after ten years 213,126 220,629 282,865 292,601 Mortgage-backed Securities and Other Equity Securities: 1,015,721 1,039,780 Total $ 1,298,586 $ 1,332,381 March 31, 2016 Carrying Value Fair Value HELD TO MATURITY (in thousands) Investment Securities: Due in one year or less $ 5,233 $ 5,144 Due after one year through five years 22,189 22,649 Due after five years through ten years 77,787 80,387 Due after ten years 278,113 291,350 383,322 399,530 Mortgage-backed Securities: 401,257 418,578 Total $ 784,579 $ 818,108

Loans and Allowance for Proba26

Loans and Allowance for Probable Loan Losses (Tables)	3 Months Ended
	Mar. 31, 2016
Receivables [Abstract]
Classification of loans in the consolidated balance sheets	Loans in the accompanying consolidated balance sheets are classified as follows (in thousands): March 31, 2016 December 31, 2015 Real Estate Loans: Construction $ 464,750 $ 438,247 1-4 Family Residential 644,826 655,410 Commercial 657,962 635,210 Commercial Loans 233,857 242,527 Municipal Loans 286,217 288,115 Loans to Individuals 155,619 172,244 Total Loans (1) 2,443,231 2,431,753 Less: Allowance for Loan Losses 21,799 19,736 Net Loans $ 2,421,432 $ 2,412,017 (1) Includes approximately $525.4 million and $581.1 million of loans acquired with the Omni acquisition as of March 31, 2016 and December 31, 2015 , respectively. The allowance for loan loss recorded on acquired loans totaled $519,000 and $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): Three Months Ended March 31, 2016 Real Estate Construction 1-4 Family Residential Commercial Commercial Loans Municipal Loans Loans to Individuals Total Balance at beginning of period $ 4,350 $ 2,595 $ 4,577 $ 6,596 $ 725 $ 893 $ 19,736 Provision (reversal) for loan losses (42 ) (551 ) (116 ) 2,620 (5 ) 410 2,316 Loans charged off — (19 ) — (273 ) — (848 ) (1,140 ) Recoveries of loans charged off 269 130 6 21 — 461 887 Balance at end of period $ 4,577 $ 2,155 $ 4,467 $ 8,964 $ 720 $ 916 $ 21,799 Three Months Ended March 31, 2015 Real Estate Construction 1-4 Family Residential Commercial Commercial Loans Municipal Loans Loans to Individuals Total Balance at beginning of period (1) $ 2,456 $ 2,822 $ 3,025 $ 3,279 $ 716 $ 994 $ 13,292 Provision (reversal) for loan losses 275 573 269 2,065 108 558 3,848 Loans charged off — (6 ) — (57 ) — (1,023 ) (1,086 ) Recoveries of loans charged off 43 11 66 29 — 723 872 Balance at end of period $ 2,774 $ 3,400 $ 3,360 $ 5,316 $ 824 $ 1,252 $ 16,926 (1) Loans acquired with the Omni acquisition were measured at fair value on December 17, 2014 with no carryover of allowance for loan loss.
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 March 31, 2016 Real Estate Construction 1-4 Family Residential Commercial Commercial Loans Municipal Loans Loans to Individuals Total Ending balance – individually evaluated for impairment (1) $ 31 $ 23 $ 56 $ 6,422 $ 13 $ 92 $ 6,637 Ending balance – collectively evaluated for impairment 4,546 2,132 4,411 2,542 707 824 15,162 Balance at end of period $ 4,577 $ 2,155 $ 4,467 $ 8,964 $ 720 $ 916 $ 21,799 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 (1) There was approximately $519,000 and $629,000 of allowance for loan losses associated with purchased credit impaired (“PCI”) loans as of March 31, 2016 and December 31, 2015 , respectively.
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): March 31, 2016 Real Estate Construction 1-4 Family Residential Commercial Commercial Loans Municipal Loans Loans to Individuals Total Loans individually evaluated for impairment $ 688 $ 1,730 $ 5,651 $ 14,650 $ 637 $ 235 $ 23,591 Loans collectively evaluated for impairment 463,842 636,151 649,297 211,096 285,580 155,194 2,401,160 Purchased credit impaired loans 220 6,945 3,014 8,111 — 190 18,480 Total ending loan balance $ 464,750 $ 644,826 $ 657,962 $ 233,857 $ 286,217 $ 155,619 $ 2,443,231 December 31, 2015 Real Estate Construction 1-4 Family Residential Commercial Commercial Loans Municipal Loans Loans to 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 loan balance $ 438,247 $ 655,410 $ 635,210 $ 242,527 $ 288,115 $ 172,244 $ 2,431,753
Summary of loans by credit quality indicators	The following tables set forth loans by credit quality indicator for the periods presented (in thousands): March 31, 2016 Pass Pass Watch Special Mention (1) Substandard (1) Doubtful (1) Total Real Estate Loans: Construction $ 452,660 $ — $ 1,943 $ 10,031 $ 116 $ 464,750 1-4 Family Residential 634,028 1,390 1,622 3,943 3,843 644,826 Commercial 643,504 621 113 12,512 1,212 657,962 Commercial Loans 197,689 1,148 4,717 10,263 20,040 233,857 Municipal Loans 284,563 — 1,017 637 — 286,217 Loans to Individuals 153,923 1 — 436 1,259 155,619 Total $ 2,366,367 $ 3,160 $ 9,412 $ 37,822 $ 26,470 $ 2,443,231 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 and $3.6 million substandard at both March 31, 2016 and December 31, 2015 . Includes PCI loans comprised of $9.8 million and $9.9 million doubtful as of March 31, 2016 and December 31, 2015 , respectively.
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) $ 21,927 $ 20,526 Accruing loans past due more than 90 days (1) 7 3 Restructured loans (2) 11,762 11,143 Other real estate owned 265 744 Repossessed assets 85 64 Total Nonperforming Assets $ 34,046 $ 32,480 (1) Excludes PCI loans measured at fair value at acquisition. (2) Includes $7.4 million and $7.5 million in PCI loans restructured as of March 31, 2016 and December 31, 2015 , respectively.
Recorded investment in nonaccrual and accruing loans past due more than 90 days by class of loans	The following table sets forth the recorded investment in nonaccrual loans by class of loans for the periods presented (in thousands): Nonaccrual Loans (1) March 31, 2016 December 31, 2015 Real Estate Loans: Construction $ 134 $ 508 1-4 Family Residential 1,410 1,847 Commercial 4,731 2,816 Commercial Loans 14,207 13,896 Loans to Individuals 1,445 1,459 Total $ 21,927 $ 20,526 (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): March 31, 2016 Unpaid Contractual Principal Balance Recorded Investment With Allowance Related Allowance for Loan Losses Real Estate Loans: Construction $ 690 $ 688 $ 31 1-4 Family Residential 1,823 1,730 23 Commercial 6,669 6,509 56 Commercial Loans 30,239 21,685 6,422 Municipal Loans 637 637 13 Loans to Individuals 269 235 92 Total (1) $ 40,327 $ 31,484 $ 6,637 (1) Includes $7.9 million of PCI loans that experienced deterioration in credit quality subsequent to the acquisition date. 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 $8.0 million of PCI loans that experienced deterioration in credit quality subsequent to the acquisition date.
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): March 31, 2016 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 $ 1,156 $ — $ 93 $ 1,249 $ 463,501 $ 464,750 1-4 Family Residential 3,622 39 716 4,377 640,449 644,826 Commercial 330 35 1,318 1,683 656,279 657,962 Commercial Loans 844 2,899 54 3,797 230,060 233,857 Municipal Loans — — — — 286,217 286,217 Loans to Individuals 1,811 208 253 2,272 153,347 155,619 Total $ 7,763 $ 3,181 $ 2,434 $ 13,378 $ 2,429,853 $ 2,443,231 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 (1) Includes PCI loans measured at fair value at acquisition.
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): Three Months Ended March 31, 2016 March 31, 2015 Average Recorded Investment (1) Interest Income Recognized (1) Average Recorded (1) Interest Income Recognized (1) Real Estate Loans: Construction $ 454 $ 6 $ 2,401 $ 23 1-4 Family Residential 1,865 14 4,000 17 Commercial 5,488 21 1,945 13 Commercial Loans 21,675 167 4,530 8 Municipal Loans 637 9 761 10 Loans to Individuals 247 2 462 — Total $ 30,366 $ 219 $ 14,099 $ 71 (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 March 31, 2016 and 2015 of loans considered to be TDRs that were restructured during the periods presented (dollars in thousands): Three Months Ended March 31, 2016 Extend Amortization Period Interest Rate Reductions Combination (1) Total Modifications Number of Loans Real Estate Loans: Construction $ 554 $ — $ — $ 554 1 Commercial 2,118 — — 2,118 1 Commercial Loans 1,176 — — 1,176 4 Total $ 3,848 $ — $ — $ 3,848 6 Three Months Ended March 31, 2015 Extend Amortization Period Interest Rate Reductions Combination (1) Total Modifications Number of Loans Real Estate Loans: 1-4 Family Residential $ — $ — $ 266 $ 266 2 Commercial 31 — — 31 1 Commercial Loans — — 762 762 1 Loans to Individuals — — 27 27 2 Total $ 31 $ — $ 1,055 $ 1,086 6 (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 following table presents the outstanding principal balance and carrying value for PCI loans for the periods presented (in thousands): March 31, 2016 December 31, 2015 Outstanding principal balance $ 27,005 $ 27,644 Carrying amount $ 18,480 $ 18,620
Schedule of changes in accretable yield for pci loans	The following table presents the changes of the accretable yield during the periods for PCI loans (in thousands): Three Months Ended 2016 2015 Balance at beginning of period $ 2,493 $ 1,820 Additions — — Reclassifications from Nonaccretable Discount 443 — Accretion (594 ) (524 ) Balance at end of period $ 2,342 $ 1,296

Long-term Obligations (Tables)

Long-term Obligations (Tables)	3 Months Ended
	Mar. 31, 2016
Debt Disclosure [Abstract]
Summary of long-term obligation	Long-term Obligations Long-term obligations are summarized as follows (in thousands): March 31, December 31, FHLB Advances (1) $ 561,990 $ 502,281 Long-term Debt (2) Southside Statutory Trust III Due 2033 (3) 20,619 20,619 Southside Statutory Trust IV Due 2037 (4) 23,196 23,196 Southside Statutory Trust V Due 2037 (5) 12,887 12,887 Magnolia Trust Company I Due 2035 (6) 3,609 3,609 Total Long-term Debt 60,311 60,311 Total Long-term Obligations $ 622,301 $ 562,592 (1) At March 31, 2016 , the weighted average cost of these advances was 1.17% . Long-term FHLB Advances have maturities ranging from April 2017 through July 2028 . (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. (3) This debt carries an adjustable rate of 3.57085% through June 29, 2016 and adjusts quarterly at a rate equal to three-month LIBOR plus 294 basis points . (4) This debt carried an adjustable rate of 1.9156% through April 29, 2016 and adjusts quarterly at a rate equal to three-month LIBOR plus 130 basis points . (5) This debt carries an adjustable rate of 2.88385% through June 14, 2016 and adjusts quarterly at a rate equal to three-month LIBOR plus 225 basis points . (6) This debt carries an adjustable rate of 2.4182% through May 22, 2016 and adjusts quarterly at a rate equal to three-month LIBOR plus 180 basis points .

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	3 Months Ended
	Mar. 31, 2016
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
The components of net periodic benefit cost	The components of net periodic benefit cost (income) are as follows (in thousands): Three Months Ended March 31, Defined Benefit Defined Benefit Pension Plan Acquired Restoration 2016 2015 2016 2015 2016 2015 Service cost $ 368 $ 476 $ — $ — $ 47 $ 73 Interest cost 917 857 53 59 135 135 Expected return on assets (1,354 ) (1,422 ) (67 ) (73 ) — — Net loss amortization 358 383 — — 53 148 Prior service (credit) cost amortization (6 ) (6 ) — — 2 2 Special and contractual termination benefits 1,520 — — — — — Net periodic benefit cost (income) $ 1,803 $ 288 $ (14 ) $ (14 ) $ 237 $ 358

Derivative Financial Instrume29

Derivative Financial Instruments and Hedging Activities Derivative Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]	The following tables present the notional and estimated fair value amount of derivative positions outstanding for the periods presented (in thousands): March 31, 2016 December 31, 2015 Estimated Fair Value Estimated Fair Value Notional Amount (1) Asset Derivative Liability Derivative Notional Amount (1) Asset Derivative Liability Derivative Derivatives designated as hedging instruments Interest rate contracts: Swaps-Cash Flow Hedge- receive floating/pay fixed $ 190,000 $ 350 $ 2,594 $ 20,000 $ — $ 1 Gross derivatives 350 2,594 — 1 Offsetting derivative assets/liabilities (350 ) (350 ) — — Cash collateral received/posted — (1,740 ) — — Net derivatives included in the consolidated balance sheets (2) $ — $ 504 $ — $ 1 (1) Notional amounts, which represent the extent of involvement in the derivatives market, are used to determine the contractual cash flows required in accordance with the terms of the agreement. These amounts are typically not exchanged, significantly exceed amounts subject to credit or market risk and are not reflected in the consolidated balance sheets. (2) Net derivative assets are included in “other assets” and net derivative liabilities are included in “other liabilities” on the consolidated balance sheets. Included in the fair value of net derivative assets and net derivative liabilities are credit valuation adjustments reflecting counterparty credit risk and our credit risk. The fair value of net derivative liabilities included credit valuation adjustments for our credit exposure of $350,000 at March 31, 2016 . We had no credit exposure at December 31, 2015 .
Weighted Average Maturity And Interest Rates On Risk Management Interest Rate Swaps [Table Text Block]	The summarized expected weighted average remaining maturity of the notional amount of interest rate swaps and the weighted average interest rates associated with the amounts expected to be received or paid on interest rate swap agreements are presented below (in thousands): March 31, 2016 December 31, 2015 Weighted Average Weighted Average Notional Amount Remaining Maturity (in years) Receive Rate (1) Pay Rate Notional Amount Remaining Maturity Receive Rate (1) Pay Swaps-Cash Flow Hedge-receive floating/pay fixed Medium-and long-term debt designation $ 190,000 5.9 0.44 % 1.36 % $ 20,000 4.9 0.29 % 1.53 % (1) Variable rates received on pay fixed swaps are based on one-month LIBOR rates in effect at March 31, 2016 and December 31, 2015 .

Fair Value Measurement (Tables)

Fair Value Measurement (Tables)	3 Months Ended
	Mar. 31, 2016
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	he 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 March 31, 2016 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: State and Political Subdivisions $ 279,792 $ — $ 279,792 $ — Other Stocks and Bonds 12,809 — 12,809 — Other Equity Securities 6,100 6,100 — — Mortgage-backed Securities: (1) Residential 565,010 — 565,010 — Commercial 468,670 — 468,670 — Derivative assets: Interest rate swaps 350 — 350 — Total asset recurring fair value measurements $ 1,332,731 $ 6,100 $ 1,326,631 $ — Derivative liabilities: Interest rate swaps $ 2,594 $ — $ 2,594 $ — Total liability recurring fair value measurements $ 2,594 $ — $ 2,594 $ — Nonrecurring fair value measurements Foreclosed assets $ 350 $ — $ — $ 350 Impaired loans (2) 24,847 — — 24,847 Total asset nonrecurring fair value measurements $ 25,197 $ — $ — $ 25,197 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 asset 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 asset nonrecurring fair value measurements $ 25,091 $ — $ — $ 25,091 (1) All mortgage-backed securities are issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises. (2) Impaired loans represent collateral-dependent 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 March 31, 2016 Carrying Total Level 1 Level 2 Level 3 Financial Assets: Cash and cash equivalents $ 68,454 $ 68,454 $ 68,454 $ — $ — Investment securities: Held to maturity, at carrying value 383,322 399,530 — 399,530 — Mortgage-backed securities: Held to maturity, at carrying value 401,257 418,578 — 418,578 — FHLB stock and other investments, at cost 53,051 53,051 — 53,051 — Loans, net of allowance for loan losses 2,421,432 2,404,287 — — 2,404,287 Loans held for sale 4,971 4,971 — 4,971 — Financial Liabilities: Retail deposits $ 3,619,368 $ 3,615,409 $ — $ 3,615,409 $ — Federal funds purchased and repurchase agreements 2,501 2,501 — 2,501 — FHLB advances 819,135 815,742 — 815,742 — Long-term debt 60,311 44,996 — 44,996 — 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 —

Income Taxes Income Taxes (Tabl

Income Taxes Income Taxes (Tables)	3 Months Ended
	Mar. 31, 2016
Income Tax Disclosure [Abstract]
Income Taxes	The income tax expense included in the accompanying statements of income consists of the following (in thousands): Three Months Ended 2016 2015 Current income tax expense $ 3,785 $ 3,438 Deferred income tax (benefit) expense (812 ) (1,535 ) Income tax expense $ 2,973 $ 1,903

Off-Balance-Sheet Arrangement32

Off-Balance-Sheet Arrangements, Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 31, 2016
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 $ 530,310 $ 546,660 Standby letters of credit 8,804 7,752 Total $ 539,114 $ 554,412

Acquisitions - Acquisitions (D

Acquisitions - Acquisitions (Details) $ in Thousands	Dec. 17, 2014USD ($)banking_office	Mar. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Goodwill
Goodwill		$ 91,520	$ 91,520
OmniAmerican Bancorp, Inc.
Business Acquisition [Line Items]
Date of acquisition	Dec. 17, 2014
Percentage of voting interests acquired	100.00%
Name of acquired entity	OmniAmerican Bancorp, Inc.
Number of banking offices | banking_office	14
Business Combination, Consideration Transferred	$ 298,300
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets			1,360,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Marketable Securities			428,400
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities			1,130,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Deposits			801,300
Goodwill
Goodwill			69,500
Loans | OmniAmerican Bancorp, Inc.
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Loans			$ 763,500
Core Deposits | OmniAmerican Bancorp, Inc.
Business Acquisition [Line Items]
Finite-lived Intangible Assets Acquired	$ 8,600
Finite-Lived Intangible Assets, Remaining Amortization Period	10 years

Earnings Per Share - Earnings

Earnings Per Share - Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Basic and Diluted Earnings:
Net income	$ 13,516	$ 9,379
Basic weighted-average shares outstanding	25,186	25,322
Add: Stock awards	66	81
Diluted weighted-average shares outstanding	25,252	25,403
Basic Earnings Per Share:
Earnings per common share - basic (in dollars per share)	$ 0.54	$ 0.37
Diluted Earnings Per Share:
Earnings per common share - diluted (in dollars per share)	$ 0.54	$ 0.37
Antidilutive securities from non-qualified stock options excluded from calculating earnings
Number of antidilutive options (in shares)	95	10

Accumulated Other Comprehensi35

Accumulated Other Comprehensive (Loss) Income - Accumulated Other Comprehensive Income, Changes In (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Accumulated Other Comprehensive Income by Component, Changes [Line Items]
Beginning balance, net of tax	$ (18,683)	$ (15,570)
Other comprehensive income (loss) before reclassifications	25,500	9,520
Reclassified from accumulated other comprehensive income	(1,977)	(1,667)
Income tax (expense) benefit	(8,233)	(2,749)
Net current-period other comprehensive income (loss), net of tax	15,290	5,104
Ending balance, net of tax	(3,393)	(10,466)
Unrealized Gains (Losses) on Securities
Accumulated Other Comprehensive Income by Component, Changes [Line Items]
Beginning balance, net of tax	(239)	6,238
Other comprehensive income (loss) before reclassifications	27,744	9,520
Reclassified from accumulated other comprehensive income	(2,384)	(2,194)
Income tax (expense) benefit	(8,876)	(2,564)
Net current-period other comprehensive income (loss), net of tax	16,484	4,762
Ending balance, net of tax	16,245	11,000
Unrealized Gains (Losses) on Derivatives
Accumulated Other Comprehensive Income by Component, Changes [Line Items]
Beginning balance, net of tax	0	0
Other comprehensive income (loss) before reclassifications	(2,244)	0
Reclassified from accumulated other comprehensive income	0	0
Income tax (expense) benefit	785	0
Net current-period other comprehensive income (loss), net of tax	(1,459)	0
Ending balance, net of tax	(1,459)	0
Net Prior Service (Cost) Credit
Accumulated Other Comprehensive Income by Component, Changes [Line Items]
Beginning balance, net of tax	(44)	7
Other comprehensive income (loss) before reclassifications	0	0
Reclassified from accumulated other comprehensive income	(4)	(4)
Income tax (expense) benefit	1	1
Net current-period other comprehensive income (loss), net of tax	(3)	(3)
Ending balance, net of tax	(47)	4
Net Gain (Loss)
Accumulated Other Comprehensive Income by Component, Changes [Line Items]
Beginning balance, net of tax	(18,400)	(21,815)
Other comprehensive income (loss) before reclassifications	0	0
Reclassified from accumulated other comprehensive income	411	531
Income tax (expense) benefit	(143)	(186)
Net current-period other comprehensive income (loss), net of tax	268	345
Ending balance, net of tax	$ (18,132)	$ (21,470)

Accumulated Other Comprehensi36

Accumulated Other Comprehensive (Loss) Income - Reclassifications out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of Unrealized Losses on Securities Transferred to Held to Maturity, before tax		$ (57)	$ (282)
Realized net gain on sale of securities		2,441	2,476
Net actuarial loss		(411)	(531)
Prior service credit		4	4
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest		16,489	11,282
Tax (expense) benefit		(2,973)	(1,903)
Net income		13,516	9,379
Total reclassifications for the period, net of tax		13,516	9,379
Reclassification out of accumulated other comprehensive income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications for the period, net of tax		1,285	1,084
Reclassification out of accumulated other comprehensive income | Unrealized losses on securities transferred to held to maturity:
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of Unrealized Losses on Securities Transferred to Held to Maturity, before tax	[1]	57	282
Tax (expense) benefit		20	99
Net income		(37)	(183)
Reclassification out of accumulated other comprehensive income | Unrealized gains and losses on available for sale securities:
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Realized net gain on sale of securities	[2]	2,441	2,476
Tax (expense) benefit		(854)	(867)
Net income		1,587	1,609
Reclassification out of accumulated other comprehensive income | Amortization of pension plan:
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net actuarial loss	[3]	(411)	(531)
Prior service credit	[3]	4	4
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest		(407)	(527)
Tax (expense) benefit		142	185
Net income		$ (265)	$ (342)
[1]	Included in interest income on the consolidated statements of income.
[2]	Listed as net gain on sale of securities available for sale on the consolidated statements of income.
[3]	hese accumulated other comprehensive income components are included in the computation of net periodic pension cost (income) presented in “Note 8 - Employee Benefit Plans.”

Securities - Schedule of Debt

Securities - Schedule of Debt and Equity Securities Components (Details) - USD ($) $ in Thousands		Mar. 31, 2016	Dec. 31, 2015
AVAILABLE FOR SALE
Amortized cost		$ 1,298,586	$ 1,452,001
Gross unrealized gains, in OCI		34,464	18,033
Gross unrealized losses, in OCI		669	9,542
Estimated fair value		1,332,381	1,460,492
HELD TO MATURITY
Amortized cost		793,381	793,154
Gross unrealized gains, in OCI		5,672	6,005
Gross unrealized losses, in OCI		14,474	14,863
Carrying value		784,579	784,296
Gross unrealized gains, not in OCI		34,709	19,311
Gross unrealized losses, not in OCI		1,180	3,844
Estimated fair value		818,108	799,763
U.S. Treasury
AVAILABLE FOR SALE
Amortized cost		0	103,906
Gross unrealized gains, in OCI		0	61
Gross unrealized losses, in OCI		0	380
Estimated fair value		0	103,587
State and Political Subdivisions
AVAILABLE FOR SALE
Amortized cost		270,091	236,534
Gross unrealized gains, in OCI		10,172	8,323
Gross unrealized losses, in OCI		471	611
Estimated fair value		279,792	244,246
HELD TO MATURITY
Amortized cost		387,936	389,997
Gross unrealized gains, in OCI		4,480	4,772
Gross unrealized losses, in OCI		9,094	9,273
Carrying value		383,322	385,496
Gross unrealized gains, not in OCI		17,387	13,061
Gross unrealized losses, not in OCI		1,179	1,363
Estimated fair value		399,530	397,194
Other Stocks and Bonds
AVAILABLE FOR SALE
Amortized cost		12,774	12,772
Gross unrealized gains, in OCI		80	63
Gross unrealized losses, in OCI		45	45
Estimated fair value		12,809	12,790
Other Equity Securities
AVAILABLE FOR SALE
Amortized cost		6,048	6,052
Gross unrealized gains, in OCI		52	0
Gross unrealized losses, in OCI		0	36
Estimated fair value		6,100	6,016
Residential
AVAILABLE FOR SALE
Amortized cost	[1]	553,121	580,621
Gross unrealized gains, in OCI	[1]	12,042	9,120
Gross unrealized losses, in OCI	[1]	153	1,239
Estimated fair value	[1]	565,010	588,502
HELD TO MATURITY
Amortized cost	[1]	34,187	31,430
Gross unrealized gains, in OCI	[1]	0	0
Gross unrealized losses, in OCI	[1]	44	51
Carrying value	[1]	34,143	31,379
Gross unrealized gains, not in OCI	[1]	2,380	2,018
Gross unrealized losses, not in OCI	[1]	1	1
Estimated fair value	[1]	36,522	33,396
Commercial
AVAILABLE FOR SALE
Amortized cost	[1]	456,552	512,116
Gross unrealized gains, in OCI	[1]	12,118	466
Gross unrealized losses, in OCI	[1]	0	7,231
Estimated fair value	[1]	468,670	505,351
HELD TO MATURITY
Amortized cost	[1]	371,258	371,727
Gross unrealized gains, in OCI	[1]	1,192	1,233
Gross unrealized losses, in OCI	[1]	5,336	5,539
Carrying value	[1]	367,114	367,421
Gross unrealized gains, not in OCI	[1]	14,942	4,232
Gross unrealized losses, not in OCI	[1]	0	2,480
Estimated fair value	[1]	$ 382,056	$ 369,173
[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 ($)	Mar. 31, 2016	Dec. 31, 2015
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months, fair value	$ 66,632,000	$ 740,522,000
More than 12 months, fair value	20,349,000	28,197,000
Total fair value	86,981,000	768,719,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]
Less than 12 months, unrealized loss	208,000	8,831,000
More than 12 months, unrealized loss	461,000	711,000
Total unrealized loss	669,000	9,542,000
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months, fair value	4,737,000	219,767,000
More than 12 months, fair value	47,304,000	64,721,000
Total fair value	52,041,000	284,488,000
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Losses [Abstract]
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	41,000	2,654,000
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	1,139,000	1,190,000
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss	1,180,000	3,844,000
State and Political Subdivisions
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months, fair value	6,134,000	15,550,000
More than 12 months, fair value	17,650,000	19,270,000
Total fair value	23,784,000	34,820,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]
Less than 12 months, unrealized loss	16,000	116,000
More than 12 months, unrealized loss	455,000	495,000
Total unrealized loss	471,000	611,000
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months, fair value	4,197,000	24,340,000
More than 12 months, fair value	47,304,000	62,240,000
Total fair value	51,501,000	86,580,000
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Losses [Abstract]
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	40,000	214,000
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	1,139,000	1,149,000
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss	1,179,000	1,363,000
US Treasury
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months, fair value	0	64,172,000
More than 12 months, fair value	0	0
Total fair value	0	64,172,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]
Less than 12 months, unrealized loss	0	380,000
More than 12 months, unrealized loss	0	0
Total unrealized loss	0	380,000
Other Stocks and Bonds
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months, fair value	2,955,000	2,954,000
More than 12 months, fair value	0	0
Total fair value	2,955,000	2,954,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]
Less than 12 months, unrealized loss	45,000	45,000
More than 12 months, unrealized loss	0	0
Total unrealized loss	45,000	45,000
Other Equity Securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months, fair value	0	6,016,000
More than 12 months, fair value	0	0
Total fair value	0	6,016,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]
Less than 12 months, unrealized loss	0	36,000
More than 12 months, unrealized loss	0	0
Total unrealized loss	0	36,000
Residential
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months, fair value	57,543,000	229,514,000
More than 12 months, fair value	2,699,000	3,817,000
Total fair value	60,242,000	233,331,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]
Less than 12 months, unrealized loss	147,000	1,215,000
More than 12 months, unrealized loss	6,000	24,000
Total unrealized loss	153,000	1,239,000
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months, fair value	540,000	1,717,000
More than 12 months, fair value	0	0
Total fair value	540,000	1,717,000
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Losses [Abstract]
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1,000	1,000
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss	1,000	1,000
Commercial
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months, fair value	0	422,316,000
More than 12 months, fair value	0	5,110,000
Total fair value	0	427,426,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract]
Less than 12 months, unrealized loss	0	7,039,000
More than 12 months, unrealized loss	0	192,000
Total unrealized loss	0	7,231,000
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months, fair value	0	193,710,000
More than 12 months, fair value	0	2,481,000
Total fair value	0	196,191,000
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Losses [Abstract]
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	0	2,439,000
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	41,000
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 0	$ 2,480,000

Securities - Interest Income o

Securities - Interest Income on Securities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Interest income recognized on securities [Abstract]
U.S. Treasury	$ 127	$ 116
U.S. Government Agency Debentures	0	32
State and Political Subdivisions	5,355	5,870
Other Stocks and Bonds	58	52
Other Equity Securities	29	32
Mortgage-backed Securities	9,391	8,462
Total interest income on securities	$ 14,960	$ 14,564

Securities - Amortized Cost an

Securities - Amortized Cost and Estimated Fair Value of Investments in Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Due in one year or less	$ 18,483
Due after one year through five years	21,036
Due after five years through ten years	30,220
Due after ten years	213,126
Total available-for-sale investment securities, amortized cost	282,865
Mortgage-backed Securities and Other Equity Securities:	1,015,721
Total	1,298,586
Available-for-sale Securities, Fair Value, Fiscal Year Maturity [Abstract]
Due in one year or less	18,576
Due after one year through five years	22,078
Due after five years through ten years	31,318
Due after ten years	220,629
Total available-for-sale investment securities	292,601
Mortgage-backed Securities and Other Equity Securities:	1,039,780
Total	1,332,381	$ 1,460,492
Held to Maturity Securities, Carrying Amount [Abstract]
Due in one year or less	5,233
Due after one year through five years	22,189
Due after five years through ten years	77,787
Due after ten years	278,113
Total held-to-maturity investment securities	383,322
Mortgage-backed securities	401,257
Carrying value	784,579	$ 784,296
Held to Maturity Securities, Fair Value [Abstract]
Due in one year or less	5,144
Due after one year through five years	22,649
Due after five years through ten years	80,387
Due after ten years	291,350
Total held-to-maturity investment securities	399,530
Mortgage-backed Securities	418,578
Total	$ 818,108

Securities - Narrative (Detail

Securities - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]
Net realized gain on AFS securities	$ 2,400	$ 2,500
Realized gains	2,600	2,500
Realized losses	202	54
Held-to-maturity Securities, Other Disclosure Items [Abstract]
Proceeds from sale of held-to-maturity securities	0	$ 0
Pledged Financial Instruments, Not Separately Reported, Securities	$ 1,130,000		$ 1,330,000

Loans and Allowance for Proba42

Loans and Allowance for Probable Loan Losses - Loans by Portfolio Segment (Details) - USD ($) $ in Thousands		Mar. 31, 2016	Dec. 31, 2015
Loans and Leases Receivable Disclosure [Abstract]
Total ending loan balance	[1]	$ 2,443,231	$ 2,431,753
Less: Allowance for Loan Losses		21,799	19,736
Net Loans		2,421,432	2,412,017
Construction
Loans and Leases Receivable Disclosure [Abstract]
Total ending loan balance		464,750	438,247
1-4 Family Residential
Loans and Leases Receivable Disclosure [Abstract]
Total ending loan balance		644,826	655,410
Commercial
Loans and Leases Receivable Disclosure [Abstract]
Total ending loan balance		657,962	635,210
Commercial Loans
Loans and Leases Receivable Disclosure [Abstract]
Total ending loan balance		233,857	242,527
Municipal Loans
Loans and Leases Receivable Disclosure [Abstract]
Total ending loan balance		286,217	288,115
Loans to Individuals
Loans and Leases Receivable Disclosure [Abstract]
Total ending loan balance		155,619	172,244
OmniAmerican Bancorp, Inc.
Loans and Financing Receivable [Line Items]
Loans acquired carrying amount		525,400	581,100
Loans and Leases Receivable Disclosure [Abstract]
Less: Allowance for Loan Losses		$ 519	$ 629
[1]	Includes approximately $525.4 million and $581.1 million of loans acquired with the Omni acquisition as of March 31, 2016 and December 31, 2015, respectively. The allowance for loan loss recorded on acquired loans totaled $519,000 and $629,000 as of March 31, 2016 and December 31, 2015, respectively.Real Estate Construction Loans

Loans and Allowance for Proba43

Loans and Allowance for Probable Loan Losses - Allowance for Loan Losses Activity by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Change in Allowances for Loan Losses [Abstract]
Balance at beginning of period	$ 19,736	$ 13,292	[1]
Provision (reversal) for loan losses	2,316	3,848
Loans charged off	(1,140)	(1,086)
Recoveries of loans charged off	887	872
Balance at end of period	21,799	16,926
Construction
Change in Allowances for Loan Losses [Abstract]
Balance at beginning of period	4,350	2,456	[1]
Provision (reversal) for loan losses	(42)	275
Loans charged off	0	0
Recoveries of loans charged off	269	43
Balance at end of period	4,577	2,774
1-4 Family Residential
Change in Allowances for Loan Losses [Abstract]
Balance at beginning of period	2,595	2,822	[1]
Provision (reversal) for loan losses	(551)	573
Loans charged off	(19)	(6)
Recoveries of loans charged off	130	11
Balance at end of period	2,155	3,400
Commercial
Change in Allowances for Loan Losses [Abstract]
Balance at beginning of period	4,577	3,025	[1]
Provision (reversal) for loan losses	(116)	269
Loans charged off	0	0
Recoveries of loans charged off	6	66
Balance at end of period	4,467	3,360
Commercial Loans
Change in Allowances for Loan Losses [Abstract]
Balance at beginning of period	6,596	3,279	[1]
Provision (reversal) for loan losses	2,620	2,065
Loans charged off	(273)	(57)
Recoveries of loans charged off	21	29
Balance at end of period	8,964	5,316
Municipal Loans
Change in Allowances for Loan Losses [Abstract]
Balance at beginning of period	725	716	[1]
Provision (reversal) for loan losses	(5)	108
Loans charged off	0	0
Recoveries of loans charged off	0	0
Balance at end of period	720	824
Loans to Individuals
Change in Allowances for Loan Losses [Abstract]
Balance at beginning of period	893	994	[1]
Provision (reversal) for loan losses	410	558
Loans charged off	(848)	(1,023)
Recoveries of loans charged off	461	723
Balance at end of period	$ 916	$ 1,252
[1]	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 Proba44

Loans and Allowance for Probable Loan Losses - Allowance Balance, by Impairment Method (Details) - USD ($) $ in Thousands		Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014	[2]
Schedule of Allowance For Loan Losses, Allowance Balance, by Impairment Method [Line Items]
Ending balance - individually evaluated for impairment	[1]	$ 6,637	$ 4,891
Ending balance - collectively evaluated for impairment		15,162	14,845
Balance at end of period		21,799	19,736	$ 16,926	$ 13,292
Allowance for credit losses, individually evaluated for impairment, PCI loans		519	629
Construction
Schedule of Allowance For Loan Losses, Allowance Balance, by Impairment Method [Line Items]
Ending balance - individually evaluated for impairment	[1]	31	12
Ending balance - collectively evaluated for impairment		4,546	4,338
Balance at end of period		4,577	4,350	2,774	2,456
1-4 Family Residential
Schedule of Allowance For Loan Losses, Allowance Balance, by Impairment Method [Line Items]
Ending balance - individually evaluated for impairment	[1]	23	25
Ending balance - collectively evaluated for impairment		2,132	2,570
Balance at end of period		2,155	2,595	3,400	2,822
Commercial
Schedule of Allowance For Loan Losses, Allowance Balance, by Impairment Method [Line Items]
Ending balance - individually evaluated for impairment	[1]	56	137
Ending balance - collectively evaluated for impairment		4,411	4,440
Balance at end of period		4,467	4,577	3,360	3,025
Commercial Loans
Schedule of Allowance For Loan Losses, Allowance Balance, by Impairment Method [Line Items]
Ending balance - individually evaluated for impairment	[1]	6,422	4,599
Ending balance - collectively evaluated for impairment		2,542	1,997
Balance at end of period		8,964	6,596	5,316	3,279
Municipal Loans
Schedule of Allowance For Loan Losses, Allowance Balance, by Impairment Method [Line Items]
Ending balance - individually evaluated for impairment	[1]	13	13
Ending balance - collectively evaluated for impairment		707	712
Balance at end of period		720	725	824	716
Loans to Individuals
Schedule of Allowance For Loan Losses, Allowance Balance, by Impairment Method [Line Items]
Ending balance - individually evaluated for impairment	[1]	92	105
Ending balance - collectively evaluated for impairment		824	788
Balance at end of period		$ 916	$ 893	$ 1,252	$ 994
[1]	There was approximately $519,000 and $629,000 of allowance for loan losses associated with purchased credit impaired (“PCI”) loans as of March 31, 2016 and December 31, 2015, respectively.
[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 Proba45

Loans and Allowance for Probable Loan Losses - Allowance for Loan Losses, Loan Portfolio, by Impairment Method (Details) - USD ($) $ in Thousands		Mar. 31, 2016	Dec. 31, 2015
Schedule of Allowance For Loan Losses, Loan Balance, by Impairment Method [Line Items]
Loans individually evaluated for impairment		$ 23,591	$ 21,161
Loans collectively evaluated for impairment		2,401,160	2,391,972
Purchased credit impaired loans		18,480	18,620
Total ending loan balance	[1]	2,443,231	2,431,753
Construction
Schedule of Allowance For Loan Losses, Loan Balance, by Impairment Method [Line Items]
Loans individually evaluated for impairment		688	508
Loans collectively evaluated for impairment		463,842	437,518
Purchased credit impaired loans		220	221
Total ending loan balance		464,750	438,247
1-4 Family Residential
Schedule of Allowance For Loan Losses, Loan Balance, by Impairment Method [Line Items]
Loans individually evaluated for impairment		1,730	1,751
Loans collectively evaluated for impairment		636,151	646,590
Purchased credit impaired loans		6,945	7,069
Total ending loan balance		644,826	655,410
Commercial
Schedule of Allowance For Loan Losses, Loan Balance, by Impairment Method [Line Items]
Loans individually evaluated for impairment		5,651	3,757
Loans collectively evaluated for impairment		649,297	628,405
Purchased credit impaired loans		3,014	3,048
Total ending loan balance		657,962	635,210
Commercial Loans
Schedule of Allowance For Loan Losses, Loan Balance, by Impairment Method [Line Items]
Loans individually evaluated for impairment		14,650	14,250
Loans collectively evaluated for impairment		211,096	220,199
Purchased credit impaired loans		8,111	8,078
Total ending loan balance		233,857	242,527
Municipal Loans
Schedule of Allowance For Loan Losses, Loan Balance, by Impairment Method [Line Items]
Loans individually evaluated for impairment		637	637
Loans collectively evaluated for impairment		285,580	287,478
Purchased credit impaired loans		0	0
Total ending loan balance		286,217	288,115
Loans to Individuals
Schedule of Allowance For Loan Losses, Loan Balance, by Impairment Method [Line Items]
Loans individually evaluated for impairment		235	258
Loans collectively evaluated for impairment		155,194	171,782
Purchased credit impaired loans		190	204
Total ending loan balance		$ 155,619	$ 172,244
[1]	Includes approximately $525.4 million and $581.1 million of loans acquired with the Omni acquisition as of March 31, 2016 and December 31, 2015, respectively. The allowance for loan loss recorded on acquired loans totaled $519,000 and $629,000 as of March 31, 2016 and December 31, 2015, respectively.Real Estate Construction Loans

Loans and Allowance for Proba46

Loans and Allowance for Probable Loan Losses - Loans by Credit Quality Indicator (Details) - USD ($) $ in Thousands		Mar. 31, 2016		Dec. 31, 2015
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans	[1]	$ 2,443,231		$ 2,431,753
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net		18,480		18,620
Construction
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans		464,750		438,247
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net		220		221
1-4 Family Residential
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans		644,826		655,410
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net		6,945		7,069
Commercial
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans		657,962		635,210
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net		3,014		3,048
Commercial Loans
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans		233,857		242,527
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net		8,111		8,078
Municipal Loans
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans		286,217		288,115
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net		0		0
Loans to Individuals
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans		155,619		172,244
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net		190		204
Pass
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans		2,366,367		2,360,256
Pass | Construction
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans		452,660		434,893
Pass | 1-4 Family Residential
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans		634,028		643,498
Pass | Commercial
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans		643,504		620,117
Pass | Commercial Loans
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans		197,689		204,775
Pass | Municipal Loans
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans		284,563		286,415
Pass | Loans to Individuals
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans		153,923		170,558
Pass Watch
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans		3,160		2,121
Pass Watch | Construction
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans		0		0
Pass Watch | 1-4 Family Residential
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans		1,390		1,403
Pass Watch | Commercial
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans		621		0
Pass Watch | Commercial Loans
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans		1,148		716
Pass Watch | Municipal Loans
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans		0		0
Pass Watch | Loans to Individuals
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans		1		2
Special Mention
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans	[2]	9,412		6,191
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net		95		95
Special Mention | Construction
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans	[2]	1,943		1,754
Special Mention | 1-4 Family Residential
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans	[2]	1,622		1,636
Special Mention | Commercial
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans	[2]	113		0
Special Mention | Commercial Loans
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans	[2]	4,717		1,738
Special Mention | Municipal Loans
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans	[2]	1,017		1,063
Special Mention | Loans to Individuals
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans	[2]	0		0
Substandard
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans	[2]	37,822		50,275
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net		3,600		3,600
Substandard | Construction
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans	[2]	10,031		1,576
Substandard | 1-4 Family Residential
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans	[2]	3,943		4,915
Substandard | Commercial
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans	[2]	12,512		14,988
Substandard | Commercial Loans
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans	[2]	10,263		27,681
Substandard | Municipal Loans
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans	[2]	637		637
Substandard | Loans to Individuals
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans	[2]	436		478
Doubtful
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans		26,470	[2]	12,910
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net		9,800		9,900
Doubtful | Construction
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans		116	[2]	24
Doubtful | 1-4 Family Residential
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans		3,843	[2]	3,958
Doubtful | Commercial
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans		1,212	[2]	105
Doubtful | Commercial Loans
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans		20,040	[2]	7,617
Doubtful | Municipal Loans
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans		0	[2]	0
Doubtful | Loans to Individuals
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Loans		$ 1,259	[2]	$ 1,206
[1]	Includes approximately $525.4 million and $581.1 million of loans acquired with the Omni acquisition as of March 31, 2016 and December 31, 2015, respectively. The allowance for loan loss recorded on acquired loans totaled $519,000 and $629,000 as of March 31, 2016 and December 31, 2015, respectively.Real Estate Construction Loans
[2]	Includes PCI loans comprised of $95,000 special mention and $3.6 million substandard at both March 31, 2016 and December 31, 2015. Includes PCI loans comprised of $9.8 million and $9.9 million doubtful as of March 31, 2016 and December 31, 2015, respectively.

Loans and Allowance for Proba47

Loans and Allowance for Probable Loan Losses - Nonperforming Assets by Asset Class (Details) - USD ($) $ in Thousands		Mar. 31, 2016	Dec. 31, 2015
Receivables [Abstract]
Purchase Credit Impaired Loans Restructured		$ 7,400	$ 7,500
Nonperforming Assets by Asset Class [Abstract]
Nonaccrual loans	[1]	21,927	20,526
Accruing loans past due more than 90 days	[1]	7	3
Restructured loans	[2]	11,762	11,143
Other real estate owned		265	744
Repossessed assets		85	64
Total Nonperforming Assets		$ 34,046	$ 32,480
[1]	Excludes PCI loans measured at fair value at acquisition.
[2]	Includes $7.4 million and $7.5 million in PCI loans restructured as of March 31, 2016 and December 31, 2015, respectively

Loans and Allowance for Proba48

Loans and Allowance for Probable Loan Losses - Nonaccrual and Accruing Loans Past Due More Than 90 Days by Class (Details) - USD ($) $ in Thousands		Mar. 31, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	[1]	$ 21,927	$ 20,526
Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	[1]	134	508
1-4 Family Residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	[1]	1,410	1,847
Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	[1]	4,731	2,816
Commercial Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	[1]	14,207	13,896
Loans to Individuals
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	[1]	$ 1,445	$ 1,459
[1]	Excludes PCI loans measured at fair value at acquisition.

Loans and Allowance for Proba49

Loans and Allowance for Probable Loan Losses - Impaired Loans by Class of Loan (Details) - USD ($) $ in Thousands	Mar. 31, 2016		Dec. 31, 2015
Impaired Financing Receivable, Recorded Investment [Abstract]
Unpaid Contractual Principal Balance	$ 40,327	[1]	$ 38,687	[2]
Recorded Investment With Allowance	31,484	[1]	29,174	[2]
Related Allowance for Loan Losses	6,637	[1]	4,891	[2]
Purchase credit impaired loans, with deterioration in dredit quality, after acquisition	7,900		8,000
Construction
Impaired Financing Receivable, Recorded Investment [Abstract]
Unpaid Contractual Principal Balance	690		1,320
Recorded Investment With Allowance	688		508
Related Allowance for Loan Losses	31		12
1-4 Family Residential
Impaired Financing Receivable, Recorded Investment [Abstract]
Unpaid Contractual Principal Balance	1,823		1,842
Recorded Investment With Allowance	1,730		1,751
Related Allowance for Loan Losses	23		25
Commercial
Impaired Financing Receivable, Recorded Investment [Abstract]
Unpaid Contractual Principal Balance	6,669		4,756
Recorded Investment With Allowance	6,509		4,636
Related Allowance for Loan Losses	56		137
Commercial Loans
Impaired Financing Receivable, Recorded Investment [Abstract]
Unpaid Contractual Principal Balance	30,239		29,844
Recorded Investment With Allowance	21,685		21,385
Related Allowance for Loan Losses	6,422		4,599
Municipal Loans
Impaired Financing Receivable, Recorded Investment [Abstract]
Unpaid Contractual Principal Balance	637		637
Recorded Investment With Allowance	637		637
Related Allowance for Loan Losses	13		13
Loans to Individuals
Impaired Financing Receivable, Recorded Investment [Abstract]
Unpaid Contractual Principal Balance	269		288
Recorded Investment With Allowance	235		257
Related Allowance for Loan Losses	$ 92		$ 105
[1]	Includes $7.9 million of PCI loans that experienced deterioration in credit quality subsequent to the acquisition date.
[2]	Includes $8.0 million of PCI loans that experienced deterioration in credit quality subsequent to the acquisition date.

Loans and Allowance for Proba50

Loans and Allowance for Probable Loan Losses - Aging of Past Due Loans by Class of Loan (Details) - USD ($) $ in Thousands		Mar. 31, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		$ 13,378	$ 12,510
Current	[1]	2,429,853	2,419,243
Total ending loan balance	[2]	2,443,231	2,431,753
30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		7,763	7,167
60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		3,181	3,074
Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		2,434	2,269
Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		1,249	587
Current	[1]	463,501	437,660
Total ending loan balance		464,750	438,247
Construction | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		1,156	121
Construction | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		0	258
Construction | Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		93	208
1-4 Family Residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		4,377	5,564
Current	[1]	640,449	649,846
Total ending loan balance		644,826	655,410
1-4 Family Residential | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		3,622	3,703
1-4 Family Residential | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		39	781
1-4 Family Residential | Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		716	1,080
Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		1,683	2,009
Current	[1]	656,279	633,201
Total ending loan balance		657,962	635,210
Commercial | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		330	359
Commercial | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		35	1,289
Commercial | Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		1,318	361
Commercial Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		3,797	1,000
Current	[1]	230,060	241,527
Total ending loan balance		233,857	242,527
Commercial Loans | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		844	527
Commercial Loans | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		2,899	138
Commercial Loans | Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		54	335
Municipal Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		0	0
Current	[1]	286,217	288,115
Total ending loan balance		286,217	288,115
Municipal Loans | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		0	0
Municipal Loans | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		0	0
Municipal Loans | Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		0	0
Loans to Individuals
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		2,272	3,350
Current	[1]	153,347	168,894
Total ending loan balance		155,619	172,244
Loans to Individuals | 30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		1,811	2,457
Loans to Individuals | 60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		208	608
Loans to Individuals | Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due		$ 253	$ 285
[1]	Includes PCI loans measured at fair value at acquisition.
[2]	Includes approximately $525.4 million and $581.1 million of loans acquired with the Omni acquisition as of March 31, 2016 and December 31, 2015, respectively. The allowance for loan loss recorded on acquired loans totaled $519,000 and $629,000 as of March 31, 2016 and December 31, 2015, respectively.Real Estate Construction Loans

Loans and Allowance for Proba51

Loans and Allowance for Probable Loan Losses - Interest Income on Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	[1]	Mar. 31, 2015
Impaired Financing Receivable, Average Recorded Investment and Interest Income on Impaired Loans [Abstract]
Average recorded investment	$ 30,366		$ 14,099
Interest income recognized	219		71
Construction
Impaired Financing Receivable, Average Recorded Investment and Interest Income on Impaired Loans [Abstract]
Average recorded investment	454		2,401
Interest income recognized	6		23
1-4 Family Residential
Impaired Financing Receivable, Average Recorded Investment and Interest Income on Impaired Loans [Abstract]
Average recorded investment	1,865		4,000
Interest income recognized	14		17
Commercial
Impaired Financing Receivable, Average Recorded Investment and Interest Income on Impaired Loans [Abstract]
Average recorded investment	5,488		1,945
Interest income recognized	21		13
Commercial Loans
Impaired Financing Receivable, Average Recorded Investment and Interest Income on Impaired Loans [Abstract]
Average recorded investment	21,675		4,530
Interest income recognized	167		8
Municipal Loans
Impaired Financing Receivable, Average Recorded Investment and Interest Income on Impaired Loans [Abstract]
Average recorded investment	637		761
Interest income recognized	9		10
Loans to Individuals
Impaired Financing Receivable, Average Recorded Investment and Interest Income on Impaired Loans [Abstract]
Average recorded investment	247		462
Interest income recognized	$ 2		$ 0
[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 Proba52

Loans and Allowance for Probable Loan Losses - Troubled Debt Restructurings (Details) $ in Thousands		3 Months Ended
		Mar. 31, 2016USD ($)contract	Mar. 31, 2015USD ($)contract
Troubled Debt Restructuring [Abstract]
Extend Amortization Period		$ 3,848	$ 31
Interest Rate Reductions		0	0
Combination	[1]	0	1,055
Total Modifications		$ 3,848	$ 1,086
Number of Loans | contract		6	6
Construction
Troubled Debt Restructuring [Abstract]
Extend Amortization Period		$ 554	$ 0
Interest Rate Reductions		0	0
Combination	[1]	0	0
Total Modifications		$ 554	$ 0
Number of Loans | contract		1	0
1-4 Family Residential
Troubled Debt Restructuring [Abstract]
Extend Amortization Period		$ 0	$ 0
Interest Rate Reductions		0	0
Combination	[1]	0	266
Total Modifications		$ 0	$ 266
Number of Loans | contract		0	2
Commercial
Troubled Debt Restructuring [Abstract]
Extend Amortization Period		$ 2,118	$ 31
Interest Rate Reductions		0	0
Combination	[1]	0	0
Total Modifications		$ 2,118	$ 31
Number of Loans | contract		1	1
Commercial Loans
Troubled Debt Restructuring [Abstract]
Extend Amortization Period		$ 1,176	$ 0
Interest Rate Reductions		0	0
Combination	[1]	0	762
Total Modifications		$ 1,176	$ 762
Number of Loans | contract		4	1
Loans to Individuals
Troubled Debt Restructuring [Abstract]
Extend Amortization Period		$ 0	$ 0
Interest Rate Reductions		0	0
Combination	[1]	0	27
Total Modifications		$ 0	$ 27
Number of Loans | contract		0	2
[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 Proba53

Loans and Allowance for Probable Loan Losses - Purchased Credit Impaired (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Purchased Credit Impaired [Abstract]
Outstanding principal balance	$ 27,005		$ 27,644
Purchased credit impaired loans	18,480		$ 18,620
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance at beginning of period	2,493	$ 1,820
Additions	0	0
Reclassifications from Nonaccretable Discount	443	0
Accretion	(594)	(524)
Balance at end of period	$ 2,342	$ 1,296

Loans and Allowance for Proba54

Loans and Allowance for Probable Loan Losses - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Receivables [Abstract]
Commercial Real Estate Loans, Commercial Real Estate	$ 582,800,000
Commercial Real Estate Loans, Multifamily	69,900,000
Commercial Real Estate Loans, Farm Land	5,300,000
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]
Loan review larger dollar loan relationship scope, aggregate debt	500,000
Specifically reserved loans or loan relationships threshold	150,000
Loans transferred to other repossessed assets and real estate through foreclosure	2,900,000		$ 67,000
Material defaults	1,393,000	$ 0
Loans and leases receivable, impaired, commitment to lend	$ 0	$ 0

Long-term Obligations - Long-t

Long-term Obligations - Long-term Obligations (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2016		Dec. 31, 2015
Debt Instruments [Abstract]
FHLB advances	[1]	$ 561,990		$ 502,281
Long-term debt	[2]	60,311		60,311
Total Long-term Obligations		$ 622,301		562,592
Federal Home Loan Bank Advances
Advances from Federal Home Loan Banks [Abstract]
Weighted average cost (in hundredths)		1.17%
Maturity date range, earliest		Apr. 3, 2017
Maturity date range, latest		Jul. 3, 2028
Southside Statutory Trust III
Debt Instrument [Line Items]
Maturity date		2,033
Debt Instruments [Abstract]
Long-term debt	[2]	$ 20,619	[3]	20,619
Long-term Debt, Other Disclosures [Abstract]
Adjusted rate of debt		3.57085%
Date of interest rate adjustment		Jun. 29, 2016
Debt instrument, description of variable rate basis		three-month LIBOR plus 294 basis points
Southside Statutory Trust IV
Debt Instrument [Line Items]
Maturity date		2,037
Debt Instruments [Abstract]
Long-term debt	[2]	$ 23,196	[4]	23,196
Long-term Debt, Other Disclosures [Abstract]
Adjusted rate of debt		1.9156%
Date of interest rate adjustment		Apr. 29, 2016
Debt instrument, description of variable rate basis		three-month LIBOR plus 130 basis points
Southside Statutory Trust V
Debt Instrument [Line Items]
Maturity date		2,037
Debt Instruments [Abstract]
Long-term debt	[2]	$ 12,887	[5]	12,887
Long-term Debt, Other Disclosures [Abstract]
Adjusted rate of debt		2.88385%
Date of interest rate adjustment		Jun. 14, 2016
Debt instrument, description of variable rate basis		three-month LIBOR plus 225 basis points
Magnolia Trust Company I
Debt Instrument [Line Items]
Maturity date		2,035
Debt Instruments [Abstract]
Long-term debt	[2]	$ 3,609	[6]	$ 3,609
Long-term Debt, Other Disclosures [Abstract]
Adjusted rate of debt		2.4182%
Date of interest rate adjustment		May 22, 2016
Debt instrument, description of variable rate basis		three-month LIBOR plus 180 basis points
LIBOR | Southside Statutory Trust III
Long-term Debt, Other Disclosures [Abstract]
Basis spread on variable rate		2.94%
LIBOR | Southside Statutory Trust IV
Long-term Debt, Other Disclosures [Abstract]
Basis spread on variable rate		1.30%
LIBOR | Southside Statutory Trust V
Long-term Debt, Other Disclosures [Abstract]
Basis spread on variable rate		2.25%
LIBOR | Magnolia Trust Company I
Long-term Debt, Other Disclosures [Abstract]
Basis spread on variable rate		1.80%
[1]	At March 31, 2016, the weighted average cost of these advances was 1.17%. Long-term FHLB Advances have maturities ranging from April 2017 through July 2028.
[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.
[3]	This debt carries an adjustable rate of 3.57085% through June 29, 2016 and adjusts quarterly at a rate equal to three-month LIBOR plus 294 basis points.
[4]	This debt carried an adjustable rate of 1.9156% through April 29, 2016 and adjusts quarterly at a rate equal to three-month LIBOR plus 130 basis points.
[5]	This debt carries an adjustable rate of 2.88385% through June 14, 2016 and adjusts quarterly at a rate equal to three-month LIBOR plus 225 basis points.
[6]	This debt carries an adjustable rate of 2.4182% through May 22, 2016 and adjusts quarterly at a rate equal to three-month LIBOR plus 180 basis points.

Long-term Obligations - Intere

Long-term Obligations - Interest Rate Swaps (Details) $ in Millions	3 Months Ended
	Mar. 31, 2016USD ($)Rate
Derivative [Line Items]
Debt Instrument, Face Amount | $	$ 190
Interest Rate Swap
Derivative [Line Items]
Derivative, Description of Hedged Item	various variable rate advance agreements with the FHLB
Debt Instrument, Description of Variable Rate Basis	one-month LIBOR
Derivative, Description of Objective	entered into various interest rate swap contracts that are treated as cash flow hedges under ASC 815 that effectively converted the variable rate advances to fixed interest rates
Interest Rate Swap | Minimum
Derivative [Line Items]
Basis spread on variable rate	0.17%
Derivative, Fixed Interest Rate	0.932%
Derivative, Term of Contract	4 years
Interest Rate Swap | Maximum
Derivative [Line Items]
Basis spread on variable rate	0.277%
Derivative, Fixed Interest Rate	1.647%
Derivative, Term of Contract	9 years

Employee Benefit Plans - Emplo

Employee Benefit Plans - Employee Benefit Plans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Defined Benefit Pension Plan
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	$ 368	$ 476
Interest cost	917	857
Expected return on assets	(1,354)	(1,422)
Net loss amortization	358	383
Prior service (credit) cost amortization	(6)	(6)
Special and contractual termination benefits	1,520	0
Net periodic benefit cost (income)	1,803	288
Defined Benefit Pension Plan Acquired
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	0	0
Interest cost	53	59
Expected return on assets	(67)	(73)
Net loss amortization	0	0
Prior service (credit) cost amortization	0	0
Special and contractual termination benefits	0	0
Net periodic benefit cost (income)	(14)	(14)
Restoration Plan
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	47	73
Interest cost	135	135
Expected return on assets	0	0
Net loss amortization	53	148
Prior service (credit) cost amortization	2	2
Special and contractual termination benefits	0	0
Net periodic benefit cost (income)	$ 237	$ 358

Derivative Financial Instrume58

Derivative Financial Instruments and Hedging Activities - Schedule Of Derivative Instruments (Details) - USD ($)		Mar. 31, 2016	Dec. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Credit Risk Valuation Adjustment, Derivative Liabilities		$ 350,000	$ 0
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount		190,000,000
Derivative Asset [Abstract]
Gross Amounts of Recognized Assets		350,000	0
Amounts Offset in the Balance Sheet		(350,000)	0
Collateral Amounts Offset in the Balance Sheet		0	0
Net Amounts of Assets Presented in the Balance Sheet	[1]	0	0
Derivative Liability [Abstract]
Gross Amounts of Recognized Liabilities		2,594,000	1,000
Amounts Offset in the Balance Sheet		(350,000)	0
Collateral Amounts Offset in the Balance Sheet		(1,740,000)	0
Net Amounts of Liabilities Presented in the Balance Sheet	[1]	504,000	1,000
Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Swap
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	[2]	190,000,000	20,000,000
Derivative Asset [Abstract]
Gross Amounts of Recognized Assets		350,000	0
Derivative Liability [Abstract]
Gross Amounts of Recognized Liabilities		$ 2,594,000	$ 1,000
[1]	Net derivative assets are included in “other assets” and net derivative liabilities are included in “other liabilities” on the consolidated balance sheets. Included in the fair value of net derivative assets and net derivative liabilities are credit valuation adjustments reflecting counterparty credit risk and our credit risk. The fair value of net derivative liabilities included credit valuation adjustments for our credit exposure of $350,000 at March 31, 2016. We had no credit exposure at December 31, 2015.
[2]	Notional amounts, which represent the extent of involvement in the derivatives market, are used to determine the contractual cash flows required in accordance with the terms of the agreement. These amounts are typically not exchanged, significantly exceed amounts subject to credit or market risk and are not reflected in the consolidated balance sheets.

Derivative Financial Instrume59

Derivative Financial Instruments and Hedging Activities - Weighted Average Remaining Maturity, Lives, and Rates of Interest Rate Swaps (Details) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
		Mar. 31, 2016	Dec. 31, 2015
Derivative [Line Items]
Derivative, Notional Amount		$ 190,000
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap
Derivative [Line Items]
Derivative, Notional Amount	[1]	190,000	$ 20,000
Long-term Debt | Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap
Derivative [Line Items]
Derivative, Notional Amount		$ 190,000
Swap [Member] | Long-term Debt | Interest Rate Swap
Derivative [Line Items]
Derivative, Notional Amount			$ 20,000
Derivative, Average Remaining Maturity		5 years 10 months 25 days	4 years 10 months 25 days
Derivative, Average Variable Interest Rate	[2]	0.44%	0.29%
Derivative, Average Fixed Interest Rate		1.36%	1.53%
[1]	Notional amounts, which represent the extent of involvement in the derivatives market, are used to determine the contractual cash flows required in accordance with the terms of the agreement. These amounts are typically not exchanged, significantly exceed amounts subject to credit or market risk and are not reflected in the consolidated balance sheets.
[2]	Variable rates received on pay fixed swaps are based on one-month LIBOR rates in effect at March 31, 2016 and December 31, 2015.

Derivative Financial Instrume60

Derivative Financial Instruments and Hedging Activities - Narrative (Details) - USD ($)	Mar. 31, 2016	Dec. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative, Notional Amount	$ 190,000,000
Debt Instrument, Face Amount	190,000,000
Collateral Already Posted, Aggregate Fair Value	1,700,000
Derivative Credit Risk Valuation Adjustment, Derivative Liabilities	$ 350,000	$ 0

Fair Value Measurement - Fair

Fair Value Measurement - Fair Value Measurements, Recurring and Nonrecurring Basis (Details) - USD ($) $ in Thousands		Mar. 31, 2016	Dec. 31, 2015
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Recurring		$ 6,100	$ 109,603
Liabilities, Fair Value Disclosure, Recurring		0
Assets, Fair Value Disclosure, Nonrecurring		0	0
Level 1 | Foreclosed assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Nonrecurring		0	0
Level 1 | Impaired loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Nonrecurring	[1]	0	0
Level 1 | Interest rate swaps
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Recurring		0
Liabilities, Fair Value Disclosure, Recurring		0
Level 1 | US Treasury
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Recurring			103,587
Level 1 | State and Political Subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Recurring		0	0
Level 1 | Other Stocks and Bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Recurring		0	0
Level 1 | Other Equity Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Recurring		6,100	6,016
Level 1 | Residential
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Recurring	[2]	0	0
Level 1 | Commercial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Recurring	[2]	0	0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Recurring		1,326,631	1,350,889
Liabilities, Fair Value Disclosure, Recurring		2,594
Assets, Fair Value Disclosure, Nonrecurring		0	0
Level 2 | Foreclosed assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Nonrecurring		0	0
Level 2 | Impaired loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Nonrecurring	[1]	0	0
Level 2 | Interest rate swaps
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Recurring		350
Liabilities, Fair Value Disclosure, Recurring		2,594
Level 2 | US Treasury
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Recurring			0
Level 2 | State and Political Subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Recurring		279,792	244,246
Level 2 | Other Stocks and Bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Recurring		12,809	12,790
Level 2 | Other Equity Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Recurring		0	0
Level 2 | Residential
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Recurring	[2]	565,010	588,502
Level 2 | Commercial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Recurring	[2]	468,670	505,351
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Recurring		0	0
Liabilities, Fair Value Disclosure, Recurring		0
Assets, Fair Value Disclosure, Nonrecurring		25,197	25,091
Level 3 | Foreclosed assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Nonrecurring		350	808
Level 3 | Impaired loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Nonrecurring	[1]	24,847	24,283
Level 3 | Interest rate swaps
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Recurring		0
Liabilities, Fair Value Disclosure, Recurring		0
Level 3 | US Treasury
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Recurring			0
Level 3 | State and Political Subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Recurring		0	0
Level 3 | Other Stocks and Bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Recurring		0	0
Level 3 | Other Equity Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Recurring		0	0
Level 3 | Residential
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Recurring	[2]	0	0
Level 3 | Commercial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Recurring	[2]	0	0
Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Recurring		1,332,731	1,460,492
Liabilities, Fair Value Disclosure, Recurring		2,594
Assets, Fair Value Disclosure, Nonrecurring		25,197	25,091
Carrying Amount | Foreclosed assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Nonrecurring		350	808
Carrying Amount | Impaired loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Nonrecurring	[1]	24,847	24,283
Carrying Amount | Interest rate swaps
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Recurring		350
Liabilities, Fair Value Disclosure, Recurring		2,594
Carrying Amount | US Treasury
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Recurring			103,587
Carrying Amount | State and Political Subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Recurring		279,792	244,246
Carrying Amount | Other Stocks and Bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Recurring		12,809	12,790
Carrying Amount | Other Equity Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Recurring		6,100	6,016
Carrying Amount | Residential
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Recurring	[2]	565,010	588,502
Carrying Amount | Commercial
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Recurring	[2]	$ 468,670	$ 505,351
[1]	Impaired loans represent collateral-dependent 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 are issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.

Fair Value Measurement - Fai62

Fair Value Measurement - Fair Value, Balance Sheet Grouping (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Level 1
Financial Assets:
Cash and cash equivalents	$ 68,454	$ 80,975
Investment securities:
Held to maturity, at carrying value	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:
Held to maturity, at carrying value	399,530	397,194
Mortgage-backed securities:
Held to maturity, at carrying value	418,578	402,569
FHLB stock and other investments, at cost	53,051	56,509
Loans, net of allowance for loan losses	0	0
Loans held for sale	4,971	3,811
Financial Liabilities:
Retail deposits	3,615,409	3,449,002
Federal funds purchased and repurchase agreements	2,501	2,429
FHLB advances	815,742	1,143,218
Long-term debt	44,996	43,695
Level 3
Financial Assets:
Cash and cash equivalents	0	0
Investment securities:
Held to maturity, at carrying value	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	2,404,287	2,364,968
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	68,454	80,975
Investment securities:
Held to maturity, at carrying value	383,322	385,496
Mortgage-backed securities:
Held to maturity, at carrying value	401,257	398,800
FHLB stock and other investments, at cost	53,051	56,509
Loans, net of allowance for loan losses	2,421,432	2,412,017
Loans held for sale	4,971	3,811
Financial Liabilities:
Retail deposits	3,619,368	3,455,407
Federal funds purchased and repurchase agreements	2,501	2,429
FHLB advances	819,135	1,147,688
Long-term debt	60,311	60,311
Estimated Fair Value
Financial Assets:
Cash and cash equivalents	68,454	80,975
Investment securities:
Held to maturity, at carrying value	399,530	397,194
Mortgage-backed securities:
Held to maturity, at carrying value	418,578	402,569
FHLB stock and other investments, at cost	53,051	56,509
Loans, net of allowance for loan losses	2,404,287	2,364,968
Loans held for sale	4,971	3,811
Financial Liabilities:
Retail deposits	3,615,409	3,449,002
Federal funds purchased and repurchase agreements	2,501	2,429
FHLB advances	815,742	1,143,218
Long-term debt	$ 44,996	$ 43,695

Income Taxes - Provision for I

Income Taxes - Provision for Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income Tax Disclosure [Abstract]
Current income tax expense	$ 3,785	$ 3,438
Deferred income tax (benefit) expense	(812)	(1,535)
Income tax expense	$ 2,973	$ 1,903

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Net deferred tax assets	$ 12,500,000		$ 19,900,000
Deferred tax assets, valuation allowance	0		$ 0
Income tax expense	$ 2,973,000	$ 1,903,000
Effective income tax rate, percent	18.00%	16.90%

Off-Balance-Sheet Arrangement65

Off-Balance-Sheet Arrangements, Commitments and Contingencies (Details) - USD ($)	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial instruments with off-balance-sheet risk, at fair value	$ 539,114,000	$ 554,412,000
Securities:
Unsettled trades to purchase securities	23,920,000	19,350,000	$ 13,096,000
Unsettled trades to sell securities	15,039,000	9,343,000	$ 1,792,000
Deposits:
Unsettled issuances of brokered CDs	0	0
Commitments to extend credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial instruments with off-balance-sheet risk, at fair value	530,310,000	546,660,000
Standby letters of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial instruments with off-balance-sheet risk, at fair value	$ 8,804,000	$ 7,752,000