Southside Bancshares (SBSI) 10-Q 11 May 15 2015 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
	Mar. 31, 2015	Apr. 30, 2015
Entity Information [Line Items]
Entity Registrant Name	SOUTHSIDE BANCSHARES INC
Entity Central Index Key	705432
Current Fiscal Year End Date	-19
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	31-Mar-15
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Amendment Flag	FALSE
Entity Common Stock, Shares Outstanding		25,331,116

CONSOLIDATED_BALANCE_SHEETS_UN

CONSOLIDATED BALANCE SHEETS (UNAUDITED) (USD $)	Mar. 31, 2015		Dec. 31, 2014
In Thousands, unless otherwise specified
ASSETS
Cash and due from banks	$55,055		$64,001
Interest earning deposits	52,123		20,654
Total cash and cash equivalents	107,178		84,655
Investment securities:
Available for sale, at estimated fair value	293,735		306,706
Held to maturity, at carrying value (estimated fair value of $399,503 and $400,248, respectively)	388,106		388,823
Mortgage-backed securities:
Available for sale, at estimated fair value	1,140,140		1,142,002
Held to maturity, at carrying value (estimated fair value of $260,818 and $261,339, respectively)	249,430		253,496
FHLB stock, at cost	39,978		39,942
Other investments, at cost	5,259		3,929
Loans held for sale	4,096		2,899
Loans:
Loans	2,174,614	[1]	2,181,133	[1]
Less: Allowance for loan losses	-16,926		-13,292
Net loans	2,157,688		2,167,841
Premises and equipment, net	111,903		112,860
Balance as of December 31, 2014	90,394		91,372
Other intangible assets, net	8,242		8,844
Interest receivable	16,644		22,436
Deferred tax asset	10,966		12,707
Unsettled trades to sell securities	1,792		57,202
Bank owned life insurance	93,021		92,384
Other assets	13,821		19,163
TOTAL ASSETS	4,732,393		4,807,261
Deposits:
Noninterest bearing	680,122		661,014
Interest bearing	2,815,218		2,713,403
Total deposits	3,495,340		3,374,417
Short-term obligations:
Federal funds purchased and repurchase agreements	2,127		4,237
FHLB advances	141,244		297,368
Total short-term obligations	143,371		301,605
Long-term obligations:
FHLB advances	549,545	[2]	600,052	[2]
Long-term debt	60,311	[3]	60,311	[3]
Total long-term obligations	609,856		660,363
Unsettled trades to purchase securities	13,096		5,982
Other liabilities	35,916		39,651
TOTAL LIABILITIES	4,297,579		4,382,018
Off-Balance Sheet Arrangements, Commitments and Contingencies
Shareholders' equity:
Common stock ($1.25 par, 40,000,000 shares authorized, 27,800,279 shares issued at March 31, 2015 (including 1,209,337 shares declared on April 13, 2015 as a stock dividend) and 26,578,127 shares issued at December 31, 2014)	33,239		33,223
Paid-in capital	390,515		389,886
Retained earnings	59,218		55,396
Treasury stock (2,469,638 shares at cost)	-37,692		-37,692
Accumulated other comprehensive loss	-10,466		-15,570
TOTAL SHAREHOLDERS' EQUITY	434,814		425,243
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$4,732,393		$4,807,261
[1]	Includes approximately $727.7 million and $763.3 million of loans acquired with the Omni acquisition as of March 31, 2015 and December 31, 2014, respectively. These loans were measured at fair value at the acquisition date with no carryover of allowance for loan loss.
[2]	At March 31, 2015, the weighted average cost of these advances was 1.32%. Long-term FHLB Advances have maturities ranging from July 2016 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_UN1

CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) (USD $)	3 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Held-to-maturity Securities, Other Disclosure Items [Abstract]
Held to Maturity, Investment Securities, fair value	$399,503	$400,248
Held to Maturity, Mortgage Backed Securities, fair value	$260,818	$261,339
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)	27,800,279	26,578,127
Treasury stock (in shares)	2,469,638	2,469,638
Stock dividend, declared and issuable (in shares)	1,209,337
Stock dividend, declared	13-Apr-15

CONSOLIDATED_STATEMENTS_OF_INC

CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Interest income
Loans	$23,916	$18,363
Investment securities - taxable	237	123
Investment securities - tax exempt	5,865	5,958
Mortgage-backed securities	8,462	7,682
FHLB stock and other investments	93	70
Other interest earning assets	34	43
Total interest income	38,607	32,239
Interest expense
Deposits	2,529	2,116
Short-term obligations	142	71
Long-term obligations	2,145	2,160
Total interest expense	4,816	4,347
Net interest income	33,791	27,892
Provision for loan losses	3,848	4,133
Net interest income after provision for loan losses	29,943	23,759
Noninterest income
Deposit services	4,989	3,638
Net gain on sale of securities available for sale	2,476	11
Gain on sale of loans	377	80
Trust income	893	780
Bank owned life insurance income	669	314
Other	1,644	983
Total noninterest income	11,048	5,806
Noninterest expense
Salaries and employee benefits	18,199	13,102
Occupancy expense	3,459	1,754
Advertising, travel & entertainment	657	543
ATM and debit card expense	679	317
Professional fees	742	927
Software and data processing expense	1,031	501
Telephone and communications	469	278
FDIC insurance	638	448
Other	3,835	2,312
Total noninterest expense	29,709	20,182
Income before income tax expense	11,282	9,383
Income tax expense	1,903	1,159
Net income	$9,379	$8,224
Earnings per common share - basic (in dollars per share)	$0.37	$0.41
Earnings per common share - diluted (in dollars per share)	$0.37	$0.41
Dividends paid on common stock (in dollars per shares)	$0.23	$0.21

CONSOLIDATED_STATEMENTS_OF_COM

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Net income	$9,379	$8,224
Other comprehensive income:
Net unrealized holding gains on available for sale securities during the period	9,520	10,011
Change in net unrealized loss on securities transferred to held to maturity	282	276
Reclassification adjustment for net gain on sale of available for sale securities, included in net income	-2,476	-11
Amortization of net actuarial loss, included in net periodic benefit cost	531	232
Amortization of prior service credit, included in net periodic benefit cost	-4	-3
Other comprehensive income, before tax	7,853	10,505
Income tax expense related to other items of comprehensive income	-2,749	-3,677
Other comprehensive income, net of tax	5,104	6,828
Comprehensive income	$14,483	$15,052

CONSOLIDATED_STATEMENTS_OF_CHA

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (UNAUDITED) (USD $)	Total	Common Stock	Paid In Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income (Loss)
In Thousands, unless otherwise specified
Balance at Dec. 31, 2013	$259,518	$25,483	$214,091	$78,673	($37,692)	($21,037)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	8,224			8,224
Other comprehensive income	6,828					6,828
Issuance of common stock (9,983 shares in 2015 and 8,325 shares in 2014)	257	10	247
Stock compensation expense	286		286
Tax benefits related to stock awards	1		1
Net issuance of common stock under employee stock plans	42	3	130	-91
Cash dividends paid on common stock ($0.23 per share in 2015 and $0.21 per share in 2014)	-3,763			-3,763
Stock dividend declared	0	1,123	24,923	-26,046
Balance at Mar. 31, 2014	271,393	26,619	239,678	56,997	-37,692	-14,209
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 (9,983 shares in 2015 and 8,325 shares in 2014)	304	12	292
Stock compensation expense	273		273
Tax benefits 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 2015 and $0.21 per share in 2014)	-5,546			-5,546
Balance at Mar. 31, 2015	$434,814	$33,239	$390,515	$59,218	($37,692)	($10,466)

CONSOLIDATED_STATEMENTS_OF_CHA1

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (UNAUDITED) (Parenthetical) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Issuance of common stock (in shares)	9,983	8,325
Dividends paid on common stock (in dollars per shares)	$0.23	$0.21

CONSOLIDATED_STATEMENTS_OF_CAS

CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
OPERATING ACTIVITIES:
Net income	$9,379	$8,224
Adjustments to reconcile net income to net cash provided by operations:
Depreciation	2,039	790
Amortization of premium	6,974	5,482
Accretion of discount and loan fees	-2,191	-887
Provision for loan losses	3,848	4,133
Stock compensation expense	273	286
Deferred tax benefit	-1,535	-989
Tax benefit related to stock awards	-4	-5
Net gain on sale of securities available for sale	-2,476	-11
Loss (gain) on premises and equipment	138	-7
Loss on other real estate owned	272	55
Net change in:
Interest receivable	5,792	6,520
Other assets	3,564	-3
Interest payable	-66	-35
Other liabilities	-3,142	3,332
Loans originated for sale	-1,197	-56
Net cash provided by operating activities	21,668	26,829
Securities held to maturity:
Maturities, calls and principal repayments	4,061	9,863
Securities available for sale:
Purchases	-279,911	-165,673
Sales	285,326	101,830
Maturities, calls and principal repayments	77,202	76,840
Proceeds from redemption of FHLB stock	0	6,766
Purchases of FHLB stock and other investments	-20	-32
Net loans originated	6,266	-24,173
Purchases of premises and equipment	-1,223	-1,285
Proceeds from sales of premises and equipment	3	8
Proceeds from sales of other real estate owned	548	194
Proceeds from sales of repossessed assets	1,088	1,730
Net cash provided by investing activities	93,340	6,068
FINANCING ACTIVITIES:
Net increase in demand and savings accounts	108,731	59,468
Net increase (decrease) in certificates of deposit	12,515	-40,463
Net (decrease) increase in federal funds purchased and repurchase agreements	-2,110	1,055
Proceeds from FHLB advances	5,227,768	5,064,879
Repayment of FHLB advances	-5,434,204	-5,111,416
Tax benefit related to stock awards	4	5
Net issuance of common stock under employee stock plan	53	42
Proceeds from the issuance of common stock	304	257
Cash dividends paid	-5,546	-3,763
Net cash used in financing activities	-92,485	-29,936
Net increase in cash and cash equivalents	22,523	2,961
Cash and cash equivalents at beginning of period	84,655	54,431
Cash and cash equivalents at end of period	107,178	57,392
SUPPLEMENTAL DISCLOSURES FOR CASH FLOW INFORMATION:
Interest paid	4,881	4,382
Income taxes paid	0	500
SUPPLEMENTAL DISCLOSURES OF NONCASH INVESTING AND FINANCING ACTIVITIES:
Loans transferred to other repossessed assets and real estate through foreclosure	674	1,263
Adjustment to pension liability	-527	-229
Declaration of 5% stock dividend	0	26,046
Unsettled trades to purchase securities	-13,096	-1,032
Unsettled trades to sell securities	$1,792	$0

CONSOLIDATED_STATEMENTS_OF_CAS1

CONSOLIDATED STATEMENTS OF CASH FLOWS CONSOLIDATED STATEMENTS OF CASH FLOW (Parenthetical)	3 Months Ended
	Mar. 31, 2015
	Rate
Stock dividend declared, percentage of common stock	5.00%

Basis_of_Presentation

Basis of Presentation	3 Months Ended
	Mar. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [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.  “OABC” and “Omni” refer to OmniAmerican Bancorp, Inc.  “SFG” refers to SFG Finance, LLC (formerly Southside Financial Group, LLC), which is a wholly-owned subsidiary of the Bank.
	The consolidated balance sheet as of March 31, 2015, and the related consolidated statements of income, comprehensive income, changes in shareholders' equity and cash flows and notes to the financial statements for the three-month periods ended March 31, 2015 and 2014 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.
	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, 2014.  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, 2014.
	On April 13, 2015, our board of directors declared a 5% stock dividend to common stock shareholders of record as of April 27, 2015, which will be paid on May 14, 2015. All share data has been adjusted to give retroactive recognition to stock dividends.
	Accounting Pronouncements
	In January 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2014-04, “Receivables-Troubled Debt Restructurings by Creditors (Subtopic 310-40): Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure.” This update clarifies that an in-substance repossession or foreclosure occurs, and a creditor is considered to have received physical possession of the residential real estate property collateralizing a consumer mortgage loan, upon either: (i) the creditor obtaining legal title to the property upon completion of the foreclosure; or (ii) the borrower conveying all interest in the property to the creditor to satisfy the loan through completion of a deed-in-lieu of foreclosure or through a similar legal agreement. ASU 2014-04 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2014. The adoption of this guidance did not have a material impact on our consolidated financial statements.
	In April 2014, the FASB issued ASU No. 2014-08, “Presentation of Financial Statements (Topic 205) and Property, Plant, and Equipment (Topic 360): Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity.”  Under the new guidance, a disposal of a component of an entity or a group of components of an entity is required to be reported in discontinued operations if the disposal represents a strategic shift that has (or will have) a major effect on the entity's operations and financial results when any of the following occurs: (i) the component of an entity or group of components of an entity meets the criteria in paragraph 205-20-45-1E to be classified as held for sale; (ii) the component of an entity or group of components of an entity is disposed of by sale; or (iii) the component of an entity or group of components of an entity is disposed of other than by sale (for example, by abandonment or in a distribution to owners in a spin-off). ASU 2014-08 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2014 with early adoption permitted.  We early adopted ASU 2014-08 in the third quarter of 2014.  The adoption of this guidance did not have a material impact on our consolidated financial statements.
	In May 2014, the FASB issued ASU 2014-09, “Revenue from Contracts with Customers (Topic 606).”  This update states that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services.  This update affects entities that enter into contracts with customers to transfer goods or services or enter into contracts for the transfer of nonfinancial assets, unless those contracts are within the scope of other standards.  ASU 2014-09 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2016.  Early adoption is not permitted.  We are in the process of reviewing the potential impact the adoption of this guidance will have on our consolidated financial statements.
	In June 2014, the FASB issued ASU 2014-11, “Transfers and Servicing (Topic 860): Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures.”  This update aligns the accounting for repurchase-to-maturity transactions and repurchase agreements executed as a repurchase financing with the accounting for other typical repurchase agreements by accounting for these transactions as secured borrowings.  This update also requires a new disclosure for transactions economically similar to repurchase agreements in which the transferor retains substantially all of the exposure to the economic return of the transferred financial assets throughout the term of the transaction.  ASU 2014-11 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2014. The adoption of this guidance did not have a significant impact on our consolidated financial statements.
	In August 2014, the FASB issued ASU 2014-14, “Receivables - Troubled Debt Restructurings by Creditors (Subtopic 310-40): Classification of Certain Government-Guaranteed Mortgage Loans upon Foreclosure.”  This update affects creditors that hold government-guaranteed mortgage loans, including those guaranteed by the Federal Housing Administration (FHA) of the U.S.  Department of Housing and Urban Development (HUD), and the U.S. Department of Veterans Affairs (VA).  The update requires that, upon foreclosure, a guaranteed mortgage loan be derecognized and a separate other receivable be recognized when specific criteria are met.  ASU 2014-14 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2014. The adoption of this guidance did not have a significant impact on our consolidated financial statements.
	In April 2015, the FASB issued ASU 2015-05, “Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40) – Customer’s Accounting for Fees Paid in a Cloud Computing Arrangement.” ASU 2015-05 affects the accounting for fees paid by a customer in cloud computing arrangements such as (i) software as a service, (ii) platform as a service (iii) infrastructure as a service and (iv) other similar hosting arrangements. If a cloud computing arrangement includes a software license, then the customer should account for the software license element of the arrangement consistent with the acquisition of other software licenses. If a cloud computing arrangement does not include a software license, the customer should account for the arrangement as a service contract. ASU 2015-05 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. Early adoption is permitted. The adoption of this guidance is not expected to have a significant impact on our consolidated financial statements.

Acquisitions_Acquisitions

Acquisitions Acquisitions	3 Months Ended
	Mar. 31, 2015
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 operations of Omni were merged into ours as of the date of the acquisition.
	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.  The purchase price allocation remains preliminary and is subject to final determination and valuation of the fair value of assets acquired and liabilities assumed. Subsequent to filing our Annual Report on Form 10-K for the year ended December 31, 2014, we continued to evaluate the assets and liabilities assumed.  This evaluation resulted in a $1.4 million adjustment to the fair value of Visa Class B stock included in other investments on the consolidated balance sheets, not previously recorded.  The impact of this adjustment on goodwill, net of deferred tax, is reflected below. 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, 2014.
	The following table reflects the changes in the carrying amount of our goodwill for the three months ended March 31, 2015 (in thousands):
		Goodwill
	Balance as of December 31, 2014	$	91,372
	Less: measurement period adjustments	(978		)
	Balance as of March 31, 2015	$	90,394

Earnings_Per_Share

Earnings Per Share	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share
	Earnings per share on a basic and diluted basis have been adjusted to give retroactive recognition to stock dividends and is calculated as follows (in thousands, except per share amounts):
		Three Months Ended March 31,
		2015		2014
	Basic and Diluted Earnings:
	Net income	$	9,379	$	8,224
	Basic weighted-average shares outstanding	25,322		19,761
	Add:   Stock awards	81		89
	Diluted weighted-average shares outstanding	25,403		19,850
	Basic Earnings Per Share:	$	0.37	$	0.41
	Diluted Earnings Per Share:	$	0.37	$	0.41
	For the three-month periods ended March 31, 2015 and 2014, there were approximately 10,000 and 26,000 anti-dilutive shares, respectively.

Accumulated_Other_Comprehensiv

Accumulated Other Comprehensive (Loss) Income	3 Months Ended
	Mar. 31, 2015
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, 2015
		Unrealized Gains (Losses) on Securities			Pension Plans
		Other			Net Prior			Net Gain (Loss)			Total
					Service
					(Cost)
					Credit
	Beginning balance, net of tax	$	6,238		$	7		$	(21,815	)	$	(15,570	)
	Other comprehensive income before reclassifications	9,802			—			—			9,802
	Reclassified to income	(2,476		)	(4		)	531			(1,949		)
	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	)
		Three Months Ended March 31, 2014
		Unrealized Gains (Losses) on Securities			Pension Plans
		Other			Net Prior			Net Gain (Loss)			Total
					Service
					(Cost)
					Credit
	Beginning balance, net of tax	$	(8,656	)	$	(12	)	$	(12,369	)	$	(21,037	)
	Other comprehensive income before reclassifications	10,287			—			—			10,287
	Reclassified to income	(11		)	(3		)	232			218
	Income tax (expense) benefit	(3,597		)	1			(81		)	(3,677		)
	Net current-period other comprehensive income (loss), net of tax	6,679			(2		)	151			6,828
	Ending balance, net of tax	$	(1,977	)	$	(14	)	$	(12,218	)	$	(14,209	)
	The reclassifications out of accumulated other comprehensive income into net income are presented below (in thousands):
		Three Months Ended March 31,
		2015			2014
	Unrealized gains and losses on available for sale securities:
	Realized net gain on sale of securities (1)	$	2,476		$	11
	Tax expense	(867		)	(4		)
	Net of tax	$	1,609		$	7
	Amortization of pension plan:
	Net actuarial loss (2)	$	(531	)	$	(232	)
	Prior service credit (2)	4			3
	Total before tax	(527		)	(229		)
	Tax benefit	185			80
	Net of tax	$	(342	)	$	(149	)
	Total reclassifications for the period, net of tax	$	1,267		$	(142	)
	(1) Listed as net gain on sale of securities available for sale on the consolidated statements of income.
	(2) These accumulated other comprehensive income components are included in the computation of net periodic benefit cost presented in “Note 8 - Employee Benefit Plans.”

Securities

Securities	3 Months Ended
	Mar. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Securities	Securities
	The amortized cost, carrying value, and estimated fair value of investment and mortgage-backed securities as of March 31, 2015 and December 31, 2014 are reflected in the tables below (in thousands):
			March 31, 2015
						Recognized in OCI									Not recognized in OCI
			Amortized			Gross			Gross Unrealized			Carrying			Gross			Gross Unrealized		Estimated
						Unrealized									Unrealized
	AVAILABLE FOR SALE		Cost			Gains			Losses			Value			Gains			Losses		Fair Value
	Investment Securities:
	U.S. Treasuries		$	24,646		$	507		$	—		$	25,153		$	—		$	—	$	25,153
	U.S. Government Agency Debentures		4,840			78			—			4,918			—			—		4,918
	State and Political Subdivisions		237,460			7,823			954			244,329			—			—		244,329
	Other Stocks and Bonds		13,089			140			—			13,229			—			—		13,229
	Other Equity Securities		6,061			45			—			6,106			—			—		6,106
	Mortgage-backed Securities: (1)
	Residential		791,207			15,459			197			806,469			—			—		806,469
	Commercial		328,813			5,240			382			333,671			—			—		333,671
	Total		$	1,406,116		$	29,292		$	1,533		$	1,433,875		$	—		$	—	$	1,433,875
	HELD TO MATURITY
	Investment Securities:
	State and Political Subdivisions		$	392,731		$	5,095		$	9,720		$	388,106		$	12,286		$	889	$	399,503
	Mortgage-backed Securities: (1)
	Residential		48,305			—			65			48,240			2,851			—		51,091
	Commercial		207,335			—			6,145			201,190			8,569			32		209,727
	Total		$	648,371		$	5,095		$	15,930		$	637,536		$	23,706		$	921	$	660,321
			December 31, 2014
						Recognized in OCI									Not recognized in OCI
			Amortized			Gross			Gross Unrealized			Carrying			Gross			Gross Unrealized		Estimated
						Unrealized									Unrealized
	AVAILABLE FOR SALE		Cost			Gains			Losses			Value			Gains			Losses		Fair Value
	Investment Securities:
	U.S. Treasuries		$	14,883		$	30		$	7		$	14,906		$	—		$	—	$	14,906
	U.S. Government Agency Debentures		4,835			—			7			4,828			—			—		4,828
	State and Political Subdivisions		260,535			8,055			906			267,684			—			—		267,684
	Other Stocks and Bonds		13,086			153			—			13,239			—			—		13,239
	Other Equity Securities		6,061			—			12			6,049			—			—		6,049
	Mortgage-backed Securities:(1)
	Residential		952,481			12,624			807			964,298			—			—		964,298
	Commercial		176,112			1,743			151			177,704			—			—		177,704
	Total		$	1,427,993		$	22,605		$	1,890		$	1,448,708		$	—		$	—	$	1,448,708
	HELD TO MATURITY
	Investment Securities:
	State and Political Subdivisions		$	393,525		$	5,168		$	9,870		$	388,823		$	12,181		$	756	$	400,248
	Mortgage-backed Securities:(1)
	Residential		52,287			—			70			52,217			2,871			—		55,088
	Commercial		207,624			—			6,345			201,279			5,461			489		206,251
	Total		$	653,436		$	5,168		$	16,285		$	642,319		$	20,513		$	1,245	$	661,587
	(1) All mortgage-backed securities issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.
	From time to time, the Company 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. There were no securities transferred from AFS to HTM during the three months ended March 31, 2015.
	The following table represents the unrealized loss on securities as of March 31, 2015 and December 31, 2014 (in thousands):
		As of March 31, 2015
		Less Than 12 Months						More Than 12 Months						Total
		Fair Value			Unrealized			Fair Value			Unrealized			Fair Value			Unrealized
					Loss						Loss						Loss
	AVAILABLE FOR SALE
	Investment Securities:
	State and Political Subdivisions	$	38,943		$	325		$	23,758		$	629		$	62,701		$	954
	Mortgage-backed Securities:
	Residential	53,148			119			18,656			78			71,804			197
	Commercial	77,243			382			—			—			77,243			382
	Total	$	169,334		$	826		$	42,414		$	707		$	211,748		$	1,533
	HELD TO MATURITY
	Investment Securities:
	State and Political Subdivisions	$	10,955		$	98		$	57,230		$	791		$	68,185		$	889
	Mortgage-backed Securities:
Commercial	—			—			6,638			32			6,638			32
Total	$	10,955		$	98		$	63,868		$	823		$	74,823		$	921
	As of December 31, 2014
	Less Than 12 Months						More Than 12 Months						Total
	Fair Value			Unrealized			Fair Value			Unrealized			Fair Value			Unrealized
				Loss						Loss						Loss
AVAILABLE FOR SALE
Investment Securities:
U.S. Treasuries	$	4,968		$	7		$	—		$	—		$	4,968		$	7
U.S. Government Agency Debentures	4,828			7			—			—			4,828			7
State and Political Subdivisions	28,155			90			44,269			816			72,424			906
Other Equity Securities	6,049			12			—			—			6,049			12
Mortgage-backed Securities:
Residential	347,777			573			27,632			234			375,409			807
Commercial	21,103			54			10,116			97			31,219			151
Total	$	412,880		$	743		$	82,017		$	1,147		$	494,897		$	1,890
HELD TO MATURITY
Investment Securities:
State and Political Subdivisions	$	7,843		$	31		$	64,946		$	725		$	72,789		$	756
Mortgage-backed Securities:
Commercial	—			—			44,144			489			44,144			489
Total	$	7,843		$	31		$	109,090		$	1,214		$	116,933		$	1,245
We review those securities in an unrealized loss position for significant differences between fair value and the cost basis to evaluate if a classification of other-than-temporary impairment is warranted. In estimating other-than-temporary impairment losses, management considers, among other things, the length of time and the extent to which the fair value has been less than cost and the financial condition and near-term prospects of the issuer.  The Company considers an other-than-temporary impairment to have occurred when there is an adverse change in expected cash flows.  When it is determined that a decline in fair value of HTM and 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 the securities with an unrealized loss do not have other-than-temporary impairment at March 31, 2015. 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, 2015.
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 security before the anticipated recovery of its amortized cost basis.
Interest income recognized on securities for the periods presented (in thousands):
	Three Months Ended March 31,
	2015			2014
U.S. Treasury	$	116		$	—
U.S. Government Agency Debentures	32			59
State and Political Subdivisions	5,870			5,970
Other Stocks and Bonds	84			52
Mortgage-backed Securities	8,462			7,682
Total interest income on securities	$	14,564		$	13,763
Of the approximately $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.  Of the $11,000 in net securities gains from the AFS portfolio for the three months ended March 31, 2014, there were $2.9 million in realized gains and $2.9 million in realized losses. There were no sales from the HTM portfolio during the three months ended March 31, 2015 or 2014. 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, 2015, are presented below by contractual maturity.  Expected maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations.  MBS are presented in total by category due to the fact that MBS typically are issued with stated principal amounts, and the securities are backed by pools of mortgages that have loans with varying maturities.  The characteristics of the underlying pool of mortgages, such as fixed-rate or adjustable-rate, as well as prepayment risk, are passed on to the 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, 2015
	Amortized Cost			Fair Value
AVAILABLE FOR SALE	(in thousands)
Investment Securities:
Due in one year or less	$	5,546		$	5,588
Due after one year through five years	17,737			18,151
Due after five years through ten years	73,069			74,408
Due after ten years	183,683			189,482
	280,035			287,629
Mortgage-backed Securities and Other Equity Securities:	1,126,081			1,146,246
Total	$	1,406,116		$	1,433,875
	March 31, 2015
	Carrying Value			Fair Value
HELD TO MATURITY	(in thousands)
Investment Securities:
Due in one year or less	$	1,078		$	1,081
Due after one year through five years	2,927			3,047
Due after five years through ten years	44,464			45,368
Due after ten years	339,637			350,007
	388,106			399,503
Mortgage-backed Securities:	249,430			260,818
Total	$	637,536		$	660,321
Investment securities and MBS with carrying values of $1.09 billion and $1.12 billion were pledged as of March 31, 2015 and December 31, 2014, respectively, to collateralize Federal Home Loan Bank (“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 their fair value and are assessed for other-than-temporary impairment.  These securities have no maturity date.

Loans_and_Allowance_for_Probab

Loans and Allowance for Probable Loan Losses	3 Months Ended
	Mar. 31, 2015
Receivables [Abstract]
Loans and Allowance for Probable Loan Losses	Loans and Allowance for Probable Loan Losses
	Loans in the accompanying consolidated balance sheets are classified as follows (in thousands):
		March 31, 2015			December 31, 2014
	Real Estate Loans:
	Construction	$	237,236		$	243,486
	1-4 Family Residential	691,955			689,288
	Other	502,476			485,226
	Commercial Loans	249,407			235,356
	Municipal Loans	252,756			257,492
	Loans to Individuals	240,784			270,285
	Total Loans (1)	2,174,614			2,181,133
	Less: Allowance for Loan Losses	16,926			13,292
	Net Loans	$	2,157,688		$	2,167,841
	(1) Includes approximately $727.7 million and $763.3 million of loans acquired with the Omni acquisition as of March 31, 2015 and December 31, 2014, respectively. These loans were measured at fair value at the acquisition date with no carryover of allowance for loan loss. The allowance for loan loss recorded on acquired loans for the three months ended March 31, 2015 was not significant.
	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 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.
	Other Real Estate
	Other 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. Other 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 throughout the state of Texas.  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.
	On October 3, 2014, we announced that we intended to sell all of our subprime automobile loans purchased through SFG, as well as the repossessed assets held by SFG.  During the fourth quarter of  2014, the sale of the subprime automobile loans and repossessed assets held by SFG was completed.  As a result, the carrying amount of SFG loans totaling $70.3 million were sold and were therefore not included in our loan portfolio as of December 31, 2014. There have been no subsequent loan pool purchases through SFG since December 2014 and there will be no additional loan pool purchases through SFG. For the three months ended March 31, 2014, SFG purchased loan pools of approximately $20.8 million, net of discount.
	Allowance for Loan Losses
	The allowance for loan losses is based on the most current review of the loan portfolio and is a result of multiple processes.  First, the bank utilizes historical data to establish general reserve amounts for each class of loans. The historical charge off figure is further adjusted through qualitative factors that include general trends in past dues, nonaccruals and classified loans to more effectively and promptly react to both positive and negative movements. Second, our lenders have the primary responsibility for identifying problem loans based on customer financial stress and underlying collateral.  These recommendations are reviewed by senior loan administration, the special assets department, and the loan review department.  Third, the loan review department independently reviews the portfolio on an annual basis.  The loan review department follows a board-approved annual loan review scope.  The loan review scope encompasses a number of considerations including the size of the loan, the type of credit extended, the seasoning of the loan and the performance of the loan.  The loan review scope, as it relates to size, focuses more on larger dollar loan relationships, typically, for example, aggregate debt of $500,000 or greater.  The loan review officer also reviews specific reserves compared to general reserves to determine trends in comparative reserves as well as losses not reserved for prior to charge-off to determine the effectiveness of the specific reserve process.
	At each review, a subjective analysis methodology is used to grade the respective loan.  Categories of grading vary in severity from loans that do not appear to have a significant probability of loss at the time of review to loans that indicate a probability that the entire balance of the loan will be uncollectible.  If full collection of the loan balance appears unlikely at the time of review, estimates of future expected cash flows or appraisals of the collateral securing the debt are used to determine the necessary allowances.  The internal loan review department maintains a list of all loans or loan relationships that are graded as having more than the normal degree of risk associated with them. In addition, a list of specifically reserved loans or loan relationships of $150,000 or more is updated on a quarterly basis in order to properly determine necessary allowances and keep management informed on the status of attempts to correct the deficiencies noted with respect to the loan.
	We calculate historical loss ratios for pools of similar loans with similar characteristics based on the proportion of actual charge-offs experienced to the total population of loans in the pool. The historical gross loss ratios are updated based on actual charge-off experience quarterly and adjusted for qualitative factors. Our pools of similar loans include consumer loans and loans secured by 1-4 family loans.
	Prior to September 30, 2014, SFG loans included in loans to individuals that experienced past due status or extension of maturity characteristics were reserved for at higher levels based on the circumstances associated with each specific loan.  In general, the reserves for SFG were calculated based on the past due status of the loan.  For reserve purposes, the portfolio was segregated by past due status and by the remaining term variance from the original contract.  During repayment, loans that paid late took longer to repay than the original contract.  Additionally, some loans may have been granted extensions for extenuating payment circumstances and evaluated for troubled debt classification.  The remaining term extensions increased the risk of collateral deterioration and, accordingly, reserves were increased to recognize this risk.
	Industry and our own experience indicates that a portion of our loans will become delinquent and a portion of the loans will require partial or full charge-off.  Regardless of the underwriting criteria utilized, losses may be experienced as a result of various factors beyond our control, including, among other things, changes in market conditions affecting the value of properties used as collateral for loans and problems affecting the credit of the borrower and the ability of the borrower to make payments on the loan.  Our determination of the appropriateness of the allowance for loan losses is based on various considerations, including an analysis of the risk characteristics of various classifications of loans, previous loan loss experience, specific loans which would have loan loss potential, delinquency trends, estimated fair value of the underlying collateral, current economic conditions, and geographic and industry loan concentration.
	Credit Quality Indicators
	We categorize loans into risk categories on an ongoing basis based on relevant information about the ability of borrowers to service their debt such as:  current financial information, historical payment experience, credit documentation, public information, and current economic trends, among other factors.  We use the following definitions for risk ratings:
	•	Pass (Rating 1 – 4) – This rating is assigned to all satisfactory loans.  This category, by definition, consists of acceptable credit.  Credit and collateral exceptions should not be present, although their presence would not necessarily prohibit a loan from being rated Pass, if deficiencies are in process of correction.  These loans are not included in the Watch List.
	•	Pass Watch (Rating 5) – These loans require some degree of special treatment, but not due to credit quality.  This category does not include loans specially mentioned or adversely classified; however, particular attention must be accorded such credits due to characteristics such as:
	◦	A lack of, or abnormally extended payment program;
	◦	A heavy degree of concentration of collateral without sufficient margin;
	◦	A vulnerability to competition through lesser or extensive financial leverage; and
	◦	A dependence on a single or few customers or sources of supply and materials without suitable substitutes or alternatives.
	•	Special Mention (Rating 6) – A Special Mention asset has potential weaknesses that deserve management’s close attention.  If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects for the asset or in the institution’s credit position at some future date.  Special Mention assets are not adversely classified and do not expose an institution to sufficient risk to warrant adverse classification.
	•	Substandard (Rating 7) – Substandard loans are inadequately protected by the current sound worth and paying capacity of the obligor or of the collateral pledged, if any.  Loans so classified must have a well-defined weakness or weaknesses that jeopardize the liquidation of the debt.  They are characterized by the distinct possibility that the Bank will sustain some loss if the deficiencies are not corrected.
	•	Doubtful (Rating 8) – Loans classified as Doubtful have all the weaknesses inherent in those classified Substandard with the added characteristic that the weaknesses make collection or liquidation, in full, on the basis of currently known facts, conditions and values, highly questionable and improbable.
	Loans, with the exception of loans to individuals and 1-4 family residential loans, that are accruing 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 are collectively evaluated and included in the general portion of the allowance for loan losses. 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.
	The following table details activity in the allowance for loan losses by portfolio segment for the periods presented (in thousands):
		Three Months Ended March 31, 2015
		Real Estate
		Construction			1-4 Family			Other			Commercial			Municipal		Loans to			Total
					Residential						Loans			Loans		Individuals
	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.
	Three Months Ended March 31, 2014
	Real Estate
	Construction			1-4 Family			Other			Commercial			Municipal		Loans to			Total
				Residential						Loans			Loans		Individuals
Balance at beginning of period	$	2,142		$	3,277		$	2,572		$	1,970		$	668	$	8,248		$	18,877
Provision (reversal) for loan losses	(10		)	536			(164		)	3			109		3,659			4,133
Loans charged off	(14		)	(22		)	—			—			—		(4,732		)	(4,768		)
Recoveries of loans charged off	12			6			3			58			—		466			545
Balance at end of period	$	2,130		$	3,797		$	2,411		$	2,031		$	777	$	7,641		$	18,787
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, 2015
	Real Estate
	Construction (1)			1-4 Family			Other			Commercial			Municipal		Loans to			Total
				Residential						Loans			Loans		Individuals
Ending balance – individually evaluated for impairment	$	123		$	47		$	35		$	3,601		$	201	$	36		$	4,043
Ending balance – collectively evaluated for impairment	2,651			3,353			3,325			1,715			623		1,216			12,883
Balance at end of period	$	2,774		$	3,400		$	3,360		$	5,316		$	824	$	1,252		$	16,926
(1) Included in individually evaluated for impairment is $78,000 in allowance for loan loss for purchased credit impaired ("PCI") loans as of March 31, 2015.
	As of December 31, 2014
	Real Estate
	Construction			1-4 Family			Other			Commercial			Municipal		Loans to			Total
				Residential						Loans			Loans		Individuals
Ending balance – individually evaluated for impairment	$	43		$	102		$	26		$	242		$	14	$	103		$	530
Ending balance – collectively evaluated for impairment	2,413			2,720			2,999			3,037			702		891			12,762
Balance at end of period	$	2,456		$	2,822		$	3,025		$	3,279		$	716	$	994		$	13,292
The following tables present the recorded investment in loans by portfolio segment based on impairment method (in thousands):
	March 31, 2015
	Real Estate
	Construction			1-4 Family			Other			Commercial			Municipal		Loans to			Total
				Residential						Loans			Loans		Individuals
Loans individually evaluated for impairment	$	2,375		$	2,069		$	3,006		$	15,278		$	949	$	126		$	23,803
Loans collectively evaluated for impairment	234,088			682,659			496,464			224,723			251,807		239,773			2,129,514
Purchased credit impaired loans	773			7,227			3,006			9,406			—		885			21,297
Total ending loan balance	$	237,236		$	691,955		$	502,476		$	249,407		$	252,756	$	240,784		$	2,174,614
	December 31, 2014
	Real Estate
	Construction			1-4 Family			Other			Commercial			Municipal		Loans to			Total
				Residential						Loans			Loans		Individuals
Loans individually evaluated for impairment	$	2,461		$	2,936		$	1,605		$	1,011		$	699	$	310		$	9,022
Loans collectively evaluated for impairment (1)	240,240			679,051			480,619			225,168			256,793		268,894			2,150,765
Purchased credit impaired loans (2)	785			7,301			3,002			9,177			—		1,081			21,346
Total ending loan balance	$	243,486		$	689,288		$	485,226		$	235,356		$	257,492	$	270,285		$	2,181,133
(1) Includes purchased non impaired loans which were measured at fair value at acquisition and did not have an associated allowance for loan loss as of December 31, 2014.
(2) PCI loans were measured at fair value at acquisition and did not have an associated allowance for loan loss as of December 31, 2014.
The following table sets forth loans by credit quality indicator for the periods presented (in thousands):
	March 31, 2015
	Pass			Pass Watch			Special Mention (1)			Substandard (1)			Doubtful (1)		Total
Real Estate Loans:
Construction	$	229,338		$	861		$	1,340		$	5,670		$	27	$	237,236
1-4 Family Residential	682,231			1,439			1,692			5,534			1,059		691,955
Other	491,551			—			2,544			8,381			—		502,476
Commercial Loans	217,861			768			2,073			18,397			10,308		249,407
Municipal Loans	251,807			—			—			699			250		252,756
Loans to Individuals	239,716			13			—			621			434		240,784
Total	$	2,112,504		$	3,081		$	7,649		$	39,302		$	12,078	$	2,174,614
(1) Includes $1.5 million special mention, $4.6 million substandard, and $8.3 million doubtful of PCI loans as of March 31, 2015.
	December 31, 2014
	Pass			Pass Watch			Special Mention (1)			Substandard (1)			Doubtful		Total
Real Estate Loans:
Construction	$	235,839		$	862		$	1,394		$	5,363		$	28	$	243,486
1-4 Family Residential	675,952			1,453			1,706			9,167			1,010		689,288
Other	472,449			2,416			2,569			7,792			—		485,226
Commercial Loans	208,202			781			1,044			25,102			227		235,356
Municipal Loans	256,543			—			—			949			—		257,492
Loans to Individuals	269,204			16			—			871			194		270,285
Total	$	2,118,189		$	5,528		$	6,713		$	49,244		$	1,459	$	2,181,133
(1) Includes $0.7 million special mention and $17.8 million substandard of PCI loans as of December 31, 2014.
Nonperforming Assets and Past Due Loans
Nonaccrual loans are loans 90 days or more delinquent and collection in full of both the principal and interest is not expected.  Additionally, some loans that are not delinquent may be placed on nonaccrual status due to doubts about full collection of principal or interest.  When a loan is categorized as nonaccrual, the accrual of interest is discontinued and any accrued balance is reversed for financial statement purposes.  Payments received on nonaccrual loans are applied to the outstanding principal balance. Payments of contractual interest are recognized as income only to the extent that full recovery of the principal balance of the loan is reasonably certain.  Loans are returned to accrual status when all the principal and interest amounts contractually due are brought current and future payments are reasonably assured.  Other factors, such as the value of collateral securing the loan and the financial condition of the borrower, are considered in judgments as to potential loan loss.
Nonaccrual loans and accruing loans past due more than 90 days include both smaller balance homogeneous loans that are collectively evaluated for impairment and individually classified impaired loans.
PCI loans are recorded at fair value at acquisition date. Although the PCI loans may be contractually delinquent, we do not classify these loans as past due or nonperforming as the loans were written down to fair value at the acquisition date and the accretable yield is recognized in interest income over the remaining life of the loan. Subsequent to acquisition, we re-assess PCI loans for additional impairment.
The following table sets forth nonperforming assets for the periods presented (in thousands):
	At			At
	March 31,			December 31,
	2015			2014
Nonaccrual loans (1)	$	20,321		$	4,096
Accruing loans past due more than 90 days (1)	1			4
Restructured loans (1)	5,782			5,874
Other real estate owned	985			1,738
Repossessed assets	173			565
Total Nonperforming Assets	$	27,262		$	12,277
(1) Excludes PCI loans measured at fair value at acquisition.
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. Loans secured by 1-4 family residential properties for which formal foreclosure proceedings were in process as of March 31, 2015 were $37,000.
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, 2015			December 31, 2014
Real Estate Loans:
Construction	$	631		$	716
1-4 Family Residential	1,982			2,017
Other	2,096			675
Commercial Loans	14,717			416
Municipal Loans	249			—
Loans to Individuals	646			272
Total	$	20,321		$	4,096
(1) Excludes PCI loans measured at fair value at acquisition.
Accruing loans past due more than 90 days were not significant.
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, 2015
	Unpaid Contractual Principal Balance			Recorded Investment With Allowance			Total Recorded Investment			Related
										Allowance for
										Loan Losses
Real Estate Loans:
Construction	$	3,113		$	2,375		$	2,375		$	45
1-4 Family Residential	2,150			2,069			2,069			47
Other	3,031			3,006			3,006			35
Commercial Loans	16,758			15,278			15,278			3,601
Municipal Loans	949			949			949			201
Loans to Individuals	136			126			126			36
Total	$	26,137		$	23,803		$	23,803		$	3,965
	December 31, 2014
	Unpaid			Recorded			Total			Related
	Contractual			Investment			Recorded			Allowance for
	Principal			With			Investment			Loan Losses
	Balance			Allowance
Real Estate Loans:
Construction	$	3,183		$	2,461		$	2,461		$	43
1-4 Family Residential	4,023			3,854			3,854			108
Other	1,622			1,605			1,605			26
Commercial Loans	1,162			1,011			1,011			242
Municipal Loans	699			699			699			14
Loans to Individuals	321			310			310			103
Total (1)	$	11,010		$	9,940		$	9,940		$	536
(1) PCI loans are excluded from this table as there was no evidence of further deterioration in credit quality subsequent to the acquisition date that would indicate it is probable that our recorded investment in these loans would not be recoverable.
There were no impaired loans recorded without an allowance as of March 31, 2015 or December 31, 2014.
The following tables present the aging of the recorded investment in past due loans by class of loans (in thousands):
	March 31, 2015
	30-59 Days			60-89 Days			Greater than 90 Days Past Due			Total Past			Current (1)		Total
	Past Due			Past Due						Due
Real Estate Loans:
Construction	$	1,777		$	—		$	118		$	1,895		$	235,341	$	237,236
1-4 Family Residential	6,329			589			306			7,224			684,731		691,955
Other	1,793			54			179			2,026			500,450		502,476
Commercial Loans	132			254			72			458			248,949		249,407
Municipal Loans	2,763			—			—			2,763			249,993		252,756
Loans to Individuals	2,974			423			415			3,812			236,972		240,784
Total	$	15,768		$	1,320		$	1,090		$	18,178		$	2,156,436	$	2,174,614
	December 31, 2014
	30-59 Days Past Due			60-89 Days Past Due			Greater than 90 Days			Total Past			Current (1)		Total
							Past Due			Due
Real Estate Loans:
Construction	$	376		$	42		$	716		$	1,134		$	242,352	$	243,486
1-4 Family Residential	3,511			509			2,017			6,037			683,251		689,288
Other	1,203			—			675			1,878			483,348		485,226
Commercial Loans	397			3			416			816			234,540		235,356
Municipal Loans	—			—			—			—			257,492		257,492
Loans to Individuals	362			66			276			704			269,581		270,285
Total	$	5,849		$	620		$	4,100		$	10,569		$	2,170,564	$	2,181,133
(1) Includes PCI loans measured at fair value at acquisition.
The following table sets forth interest income recognized on impaired loans by class of loans for the periods presented. Average recorded investment of impaired loans is reported on a year-to-date basis (in thousands):
	Three Months Ended
	March 31, 2015						March 31, 2014
	Average Recorded Investment (1)			Interest Income Recognized (1)			Average Recorded			Interest Income Recognized
							Investment
Real Estate Loans:
Construction	$	2,401		$	23		$	1,371		$	—
1-4 Family Residential	4,000			17			2,471			12
Other	1,945			13			1,717			12
Commercial Loans	4,530			8			1,480			4
Municipal Loans	761			10			759			—
Loans to Individuals	462			—			3,099			32
Total	$	14,099		$	71		$	10,897		$	60
(1) Excludes PCI loans measured at fair value at acquisition.
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, 2015 and 2014 of loans considered to be TDRs that were restructured during the periods presented (dollars in thousands):
	Three Months Ended March 31, 2015
	Extend Amortization			Interest Rate Reductions			Combination (1)			Total Modifications			Number of Loans
	Period
Real Estate Loans:
1-4 Family Residential	$	—		$	—		$	266		$	266		2
Other	31			—			—			31			1
Commercial Loans	—			—			762			762			1
Loans to Individuals	—			—			27			27			2
Total	$	31		$	—		$	1,055		$	1,086		6
	Three Months Ended March 31, 2014
	Extend Amortization			Interest Rate Reductions			Combination (1)			Total Modifications			Number of Loans
	Period
Real Estate Loans:
1-4 Family Residential	—			286			—			286			1
Other	338			—			25			363			2
Commercial Loans	261			—			57			318			3
Loans to Individuals	—			17			47			64			4
Total	$	599		$	303		$	129		$	1,031		10
(1) These modifications include an extension of the amortization period and interest rate reduction.
The majority of loans restructured as TDRs during the three months ended March 31, 2015 were modified with a combination of interest rate reductions and 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, 2015 and March 31, 2014 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, 2015 and 2014, there were no material defaults. Payment defaults for TDRs did not significantly impact the determination of the allowance for loan loss in either period presented.
At March 31, 2015 and 2014, 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, 2015			December 31, 2014
Outstanding principal balance	$	31,584		$	32,572
Carrying amount	$	21,297		$	21,346
The following table presents the changes of the accretable yield during the periods for PCI loans (in thousands):
	March 31, 2015			31-Dec-14
Balance at beginning of period	$	1,820		$	—
Additions	—			—
Additions due to acquisition	—			1,898
Accretion	(524		)	(78		)
Balance at end of period	$	1,296		$	1,820

Longterm_Obligations

Long-term Obligations	3 Months Ended
	Mar. 31, 2015
Debt Disclosure [Abstract]
Long-term Obligations	Long-term Obligations
	Long-term obligations are summarized as follows (in thousands):
		March 31,		December 31,
		2015		2014
	FHLB Advances (1)	$	549,545	$	600,052
	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	$	609,856	$	660,363
	-1	At March 31, 2015, the weighted average cost of these advances was 1.32%.  Long-term FHLB Advances have maturities ranging from July 2016 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 3.2154% through June 29, 2015 and adjusts quarterly thereafter at a rate equal to three-month LIBOR plus 294 basis points.
	-4	This debt carries an adjustable rate of 1.5546% through April 29, 2015 and adjusts quarterly thereafter at a rate equal to three-month LIBOR plus 130 basis points.
	-5	This debt carries an adjustable rate of 2.5206% through June 14, 2015 and adjusts quarterly thereafter at a rate equal to three-month LIBOR plus 225 basis points.
	-6	This debt carries an adjustable rate of 2.0615% through May 25, 2015 and adjusts quarterly thereafter at a rate equal to three-month LIBOR plus 180 basis points.

Employee_Benefit_Plans

Employee Benefit Plans	3 Months Ended
	Mar. 31, 2015
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
Employee Benefit Plans	Employee Benefit Plans
	The components of net periodic benefit cost are as follows (in thousands):
		Three Months Ended March 31,
		Defined Benefit						Defined Benefit Pension Plan Acquired					Restoration
		Pension Plan											Plan
		2015			2014			2015			2014		2015		2014
	Service cost	$	476		$	448		$	—		$	—	$	73	$	69
	Interest cost	857			872			59			—		135		136
	Expected return on assets	(1,422		)	(1,412		)	(73		)	—		—		—
	Net actuarial loss recognition	383			131			—			—		148		101
	Prior service (credit) cost amortization	(6		)	(4		)	—			—		2		1
	Net periodic benefit cost	$	288		$	35		$	(14	)	$	—	$	358	$	307
	Employer Contributions.  For the three months ended March 31, 2015, contributions of $60,000 have been made to our restoration plan. We do not anticipate contributing to either of our defined benefit pension plans in 2015.

Sharebased_Incentive_Plans

Share-based Incentive Plans	3 Months Ended
	Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-based Incentive Plans	Share-based Incentive Plans
	2009 Incentive Plan
	On April 16, 2009, our shareholders approved the Southside Bancshares, Inc. 2009 Incentive Plan (the “2009 Incentive Plan”), which is a stock-based incentive compensation plan.  A total of 1,407,103 shares of our common stock were reserved and available for issuance pursuant to awards granted under the 2009 Incentive Plan.  Under the 2009 Incentive Plan, we were authorized to grant nonqualified stock options (“NQSOs”), restricted stock units (“RSUs”), or any combination thereof to certain officers. During the three months ended March 31, 2015, we granted RSUs and NQSOs pursuant to the 2009 Incentive Plan. During the three months ended March 31 2014, there were no grants of RSUs or NQSOs pursuant to the 2009 Incentive Plan.
	As of March 31, 2015, there were 299,306 unvested awards outstanding.  For the three months ended March 31, 2015, there was share-based compensation expense of $273,000 with an associated income tax benefit for the three months of $95,000. As of March 31, 2014, there were 424,169 unvested awards outstanding.  Share-based compensation expense for the three months ended March 31, 2014 was $286,000 with an associated income tax benefit for the three months of $100,000.
	As of March 31, 2015 and 2014, there was $2.2 million and $2.8 million of unrecognized compensation cost, respectively, related to the unvested awards outstanding. The remaining cost at March 31, 2015 is expected to be recognized over a weighted-average period of 2.8 years.
	The NQSOs have contractual terms of 10 years and vest in equal annual installments over three- and four-year periods.
	The fair value of each RSU is the closing stock price on the date of grant.  The RSUs vest in equal annual installments over three- and four-year periods.
	Each award is evidenced by an award agreement that specifies the exercise price, if applicable, the duration of the award, the number of shares to which the award pertains, and such other provisions as the Board determines.
	Shares issued in connection with stock compensation awards are issued from authorized shares and not from treasury shares.  During the three months ended March 31, 2015 and 2014, there were 2,974 and 2,515 shares, respectively, issued in connection with stock compensation awards from available authorized shares.
	The following table presents activity related to our RSUs and NQSOs as of March 31, 2015.
					Restricted Stock Units							Stock Options
					Outstanding							Outstanding
		Shares			Number			Weighted-				Number			Weighted-		Weighted-
		Available			of Shares			Average				of Shares			Average		Average
		for Grant						Grant-Date							Exercise		Grant-Date
								Fair Value							Price		Fair Value
	Balance, January 1, 2015	821,604			31,753			$	21.75			419,334			$	19.88	$	6
	Granted	(68,098	)		15,097			25.46				53,001			25.46		7.25
	Stock options exercised	—			—			—				(2,974	)		17.74		5.28
	Stock awards vested	—			—			—				—			—		—
	Forfeited	13,000			(1,700	)		25.23				(11,300	)		22.52		6.63
	Canceled/expired	—			—			—				—			—		—
	Balance, March 31, 2015	766,506			45,150			$	22.86			458,061			$	20.47	$	6.13
	Other information regarding options outstanding and exercisable as of March 31, 2015 is as follows:
							Options Outstanding									Options Exercisable
	Range of Exercise Prices						Number			Weighted-				Weighted-		Number	Weighted-
							of Shares			Average				Average Remaining		of Shares	Average
										Exercise				Contractual			Exercise
										Price				Life in Years			Price
	$	15.79		-	$25.46		458,061			$	20.47			7.77		203,905	$	18.42
	Total						458,061			$	20.47			7.77		203,905	$	18.42
	The total intrinsic value (i.e., the amount by which the fair value of the underlying common stock exceeds the exercise price of a stock option) of outstanding stock options and exercisable stock options was $3.1 million and $1.8 million at March 31, 2015, respectively.
	Cash received from stock options exercised for the three months ended March 31, 2015 and 2014 was $53,000 and $42,000, respectively. The total intrinsic value related to stock options exercised during the three months ended March 31, 2015 and 2014, was approximately $28,000 and $24,000, respectively.

Fair_Value_Measurement

Fair Value Measurement	3 Months Ended
	Mar. 31, 2015
Fair Value Disclosures [Abstract]
Fair Value Measurement	Fair Value Measurement
	Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants.  A fair value measurement assumes that the transaction to sell the asset or transfer the liability occurs in the principal market for the asset or liability or, in the absence of a principal market, the most advantageous market for the asset or liability.  The price in the principal (or most advantageous) market used to measure the fair value of the asset or liability shall not be adjusted for transaction costs.  An orderly transaction is a transaction that assumes exposure to the market for a period prior to the measurement date to allow for marketing activities that are usual and customary for transactions involving such assets and liabilities; it is not a forced transaction.  Market participants are buyers and sellers in the principal market that are (i) independent, (ii) knowledgeable, (iii) able to transact and (iv) willing to transact.
	Valuation techniques including the market approach, the income approach and/or the cost approach are utilized to determine fair value.  Inputs to valuation techniques refer to the assumptions that market participants would use in pricing the asset or liability.  Valuation policies and procedures are determined by our investment department and reported to our Asset/Liability Committee ("ALCO") for review.  An entity must consider all aspects of nonperforming risk, including the entity’s own credit standing, when measuring fair value of a liability.  Inputs may be observable, meaning those that reflect the assumptions market participants would use in pricing the asset or liability developed based on market data obtained from independent sources, or unobservable, meaning those that reflect the reporting entity’s own assumptions about the assumptions market participants would use in pricing the asset or liability developed based on the best information available in the circumstances.  A fair value hierarchy for valuation inputs gives the highest priority to quoted prices in active markets for identical assets or liabilities and the lowest priority to unobservable inputs.  The fair value hierarchy is as follows:
	Level 1 Inputs - Unadjusted quoted prices in active markets for identical assets or liabilities that the reporting entity has the ability to access at the measurement date.
	Level 2 Inputs - Inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly.  These might include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability (such as interest rates, volatilities, prepayment speeds, credit risks, etc.) or inputs that are derived principally from or corroborated by market data by correlation or other means.
	Level 3 Inputs - Unobservable inputs for determining the fair values of assets or liabilities that reflect an entity's own assumptions about the assumptions that market participants would use in pricing the assets or liabilities.
	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.
	Securities Available for Sale – U.S. Treasury 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.
	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, 2015.
	Loans Held for Sale – These loans are reported at the lower of cost or fair value.  Fair value is determined based on expected proceeds, which are based on sales contracts and commitments and are considered Level 2 inputs. Based on our estimates of fair value, no valuation allowance was recognized as of March 31, 2015 or December 31, 2014.
	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, sales cost estimates, etc.  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, 2015 and December 31, 2014, the impact of loans with specific reserves based on the fair value of the collateral was reflected in our allowance for loan losses.
	Certain nonfinancial assets and nonfinancial liabilities measured at fair value on a recurring basis include reporting units measured at fair value and tested for goodwill impairment.
	Level 3 assets recorded at fair value on a nonrecurring basis at March 31, 2015, included loans for which a specific allowance was established based on the fair value of collateral and other 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.
	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, 2015
				Fair Value Measurements at the End of the Reporting Period Using
		Carrying		Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
		Amount		(Level 1)		(Level 2)		(Level 3)
	Recurring fair value measurements
	Investment Securities:
	U.S. Treasuries	$	25,153	$	25,153	$	—	$	—
	U.S. Government Agency Debentures	4,918		—		4,918		—
	State and Political Subdivisions	244,329		—		244,329		—
	Other Stocks and Bonds	13,229		—		13,229		—
	Other Equity Securities	6,106		6,106		—		—
	Mortgage-backed Securities: (1)
	Residential	806,469		—		806,469		—
	Commercial	333,671		—		333,671		—
	Total recurring fair value measurements	$	1,433,875	$	31,259	$	1,402,616	$	—
	Nonrecurring fair value measurements
	Foreclosed assets	$	1,158	$	—	$	—	$	1,158
	Impaired loans (2)	19,838		—		—		19,838
	Total nonrecurring fair value measurements	$	20,996	$	—	$	—	$	20,996
		As of December 31, 2014
				Fair Value Measurements at the End of the Reporting Period Using
		Carrying		Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
		Amount		(Level 1)		(Level 2)		(Level 3)
	Recurring fair value measurements
	Investment Securities:
	U.S. Treasuries	$	14,906	$	14,906	$	—	$	—
	U.S. Government Agency Debentures	4,828		—		4,828		—
	State and Political Subdivisions	267,684		—		267,684		—
	Other Stocks and Bonds	13,239		—		13,239		—
	Other Equity Securities	6,049		6,049		—		—
	Mortgage-backed Securities: (1)
	Residential	964,298		—		964,298		—
	Commercial	177,704		—		177,704		—
	Total recurring fair value measurements	$	1,448,708	$	20,955	$	1,427,753	$	—
	Nonrecurring fair value measurements
	Foreclosed assets	$	2,303	$	—	$	—	$	2,303
	Impaired loans (2)	9,404		—		—		9,404
	Total nonrecurring fair value measurements	$	11,707	$	—	$	—	$	11,707
	-1	All mortgage-backed securities are issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.
	-2	Loans represent collateral dependent impaired loans with a specific valuation allowance. Losses on these loans represent charge-offs which are netted against the allowance for loan losses.
	Disclosure of fair value information about financial instruments, whether or not recognized in the balance sheet is required 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 - 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 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.
	Deposit liabilities - The fair value of demand deposits, savings accounts, and certain money market deposits is the amount on demand at the reporting date, that 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, 2015	Carrying		Total		Level 1		Level 2		Level 3
	Amount
Financial Assets:
Cash and cash equivalents	$	107,178	$	107,178	$	107,178	$	—	$	—
Investment securities:
Held to maturity, at carrying value	388,106		399,503		—		399,503		—
Mortgage-backed securities:
Held to maturity, at carrying value	249,430		260,818		—		260,818		—
FHLB stock and other investments, at cost	45,237		45,237		—		45,237		—
Loans, net of allowance for loan losses	2,157,688		2,129,587		—		—		2,129,587
Loans held for sale	4,096		4,096		—		4,096		—
Financial Liabilities:
Retail deposits	$	3,495,340	$	3,493,430	$	—	$	3,493,430	$	—
Federal funds purchased and repurchase agreements	2,127		2,127		—		2,127		—
FHLB advances	690,789		683,933		—		683,933		—
Long-term debt	60,311		43,844		—		43,844		—
			Estimated Fair Value
December 31, 2014	Carrying		Total		Level 1		Level 2		Level 3
	Amount
Financial Assets:
Cash and cash equivalents	$	84,655	$	84,655	$	84,655	$	—	$	—
Investment securities:
Held to maturity, at carrying value	388,823		400,248		—		400,248		—
Mortgage-backed securities:
Held to maturity, at carrying value	253,496		261,339		—		261,339		—
FHLB stock and other investments, at cost	43,871		43,871		—		43,871		—
Loans, net of allowance for loan losses	2,167,841		2,140,088		—		—		2,140,088
Loans held for sale	2,899		2,899		—		2,899		—
Financial Liabilities:
Retail deposits	$	3,374,417	$	3,369,784	$	—	$	3,369,784	$	—
Federal funds purchased and repurchase agreements	4,237		4,237		—		4,237		—
FHLB advances	897,420		886,087		—		886,087		—
Long-term debt	60,311		43,860		—		43,860		—
As discussed earlier, the fair value estimate of financial instruments for which quoted market prices are unavailable is dependent upon 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_Note

Income Taxes Income Taxes (Notes)	3 Months Ended
	Mar. 31, 2015
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 March 31,
		2015			2014
	Current income tax expense	$	3,438		$	2,016
	Deferred income tax (benefit) expense	(1,535		)	(857		)
	Income tax expense	$	1,903		$	1,159
	Net deferred tax assets totaled $11.0 million at March 31, 2015 and $12.7 million at December 31, 2014. The decrease in net deferred tax assets resulted from an increase in unrealized gains on securities available for sale. No valuation allowance for deferred tax assets was recorded at March 31, 2015 or December 31, 2014, as management believes it is more likely than not that all of the deferred tax assets will be realized in future years. There was approximately $50,000 in unrecognized tax benefits at March 31, 2015.
	We recognized income tax expense of $1.9 million, for an effective tax rate of 16.9%, for the three months ended March 31, 2015, compared to income tax expense of $1.2 million, for an effective tax rate of 12.4%, for the three months ended March 31, 2014. The higher effective tax rate for the three months ended March 31, 2015 was due to a decrease in tax-exempt income as a percentage of pre-tax income as compared to the same period in 2014. We file income tax returns in the U.S. federal jurisdiction and in certain states. We are no longer subject to U.S. federal income tax examinations by tax authorities for years before 2011.

OffBalanceSheet_Arrangements_C

Off-Balance-Sheet Arrangements, Commitments and Contingencies	3 Months Ended
	Mar. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Off-Balance-Sheet Arrangements, Commitments and Contingencies	Off-Balance-Sheet Arrangements, Commitments and Contingencies
	Financial Instruments with Off-Balance-Sheet Risk. In the normal course of business, we are a party to certain financial instruments, with off-balance-sheet risk, to meet the financing needs of our customers.  These off-balance-sheet instruments include commitments to extend credit and standby letters of credit.  These instruments involve, to varying degrees, elements of credit and interest rate risk in excess of the amount reflected in the financial statements.  The contract or notional amounts of these instruments reflect the extent of involvement and exposure to credit loss that we have in these particular classes of financial instruments.
	Commitments to extend credit are agreements to lend to a customer provided that the terms established in the contract are met. Commitments generally have fixed expiration dates and may require 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.
	Financial instruments with off-balance-sheet risk were as follows (in thousands):
		At		At
		March 31,		December 31,
		2015		2014
	Unused commitments:
	Commitments to extend credit	$	425,712	$	373,255
	Standby letters of credit	6,387		6,222
	Total	$	432,099	$	379,477
	We apply the same credit policies in making commitments and standby letters of credit as we do for on-balance-sheet instruments.  We evaluate each customer's creditworthiness on a case-by-case basis.  The amount of collateral obtained, if deemed necessary, upon extension of credit is based on management's credit evaluation of the borrower.  Collateral held varies but may include cash or cash equivalents, negotiable instruments, real estate, accounts receivable, inventory, oil, gas and mineral interests, property, plant, and equipment.
	Lease Commitments. We lease certain branch facilities and office equipment under operating leases.  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 $13.1 million and $6.0 million of unsettled trades to purchase securities at March 31, 2015 and December 31, 2014, respectively. There were $1.8 million and $57.2 million unsettled trades to sell securities as of March 31, 2015 and December 31, 2014, respectively.
	Deposits. There were no unsettled issuances of brokered CDs at March 31, 2015 or December 31, 2014.
	Litigation. We are involved with various litigation in the normal course of business.  Management, after consulting with our legal counsel, believes that any liability resulting from litigation will not have a material effect on our financial position, results of operations or liquidity.

Basis_of_Presentation_Accounti

Basis of Presentation Accounting Pronouncements (Policies)	3 Months Ended
	Mar. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accounting Pronouncements	Accounting Pronouncements
	In January 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2014-04, “Receivables-Troubled Debt Restructurings by Creditors (Subtopic 310-40): Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure.” This update clarifies that an in-substance repossession or foreclosure occurs, and a creditor is considered to have received physical possession of the residential real estate property collateralizing a consumer mortgage loan, upon either: (i) the creditor obtaining legal title to the property upon completion of the foreclosure; or (ii) the borrower conveying all interest in the property to the creditor to satisfy the loan through completion of a deed-in-lieu of foreclosure or through a similar legal agreement. ASU 2014-04 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2014. The adoption of this guidance did not have a material impact on our consolidated financial statements.
	In April 2014, the FASB issued ASU No. 2014-08, “Presentation of Financial Statements (Topic 205) and Property, Plant, and Equipment (Topic 360): Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity.”  Under the new guidance, a disposal of a component of an entity or a group of components of an entity is required to be reported in discontinued operations if the disposal represents a strategic shift that has (or will have) a major effect on the entity's operations and financial results when any of the following occurs: (i) the component of an entity or group of components of an entity meets the criteria in paragraph 205-20-45-1E to be classified as held for sale; (ii) the component of an entity or group of components of an entity is disposed of by sale; or (iii) the component of an entity or group of components of an entity is disposed of other than by sale (for example, by abandonment or in a distribution to owners in a spin-off). ASU 2014-08 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2014 with early adoption permitted.  We early adopted ASU 2014-08 in the third quarter of 2014.  The adoption of this guidance did not have a material impact on our consolidated financial statements.
	In May 2014, the FASB issued ASU 2014-09, “Revenue from Contracts with Customers (Topic 606).”  This update states that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services.  This update affects entities that enter into contracts with customers to transfer goods or services or enter into contracts for the transfer of nonfinancial assets, unless those contracts are within the scope of other standards.  ASU 2014-09 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2016.  Early adoption is not permitted.  We are in the process of reviewing the potential impact the adoption of this guidance will have on our consolidated financial statements.
	In June 2014, the FASB issued ASU 2014-11, “Transfers and Servicing (Topic 860): Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures.”  This update aligns the accounting for repurchase-to-maturity transactions and repurchase agreements executed as a repurchase financing with the accounting for other typical repurchase agreements by accounting for these transactions as secured borrowings.  This update also requires a new disclosure for transactions economically similar to repurchase agreements in which the transferor retains substantially all of the exposure to the economic return of the transferred financial assets throughout the term of the transaction.  ASU 2014-11 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2014. The adoption of this guidance did not have a significant impact on our consolidated financial statements.
	In August 2014, the FASB issued ASU 2014-14, “Receivables - Troubled Debt Restructurings by Creditors (Subtopic 310-40): Classification of Certain Government-Guaranteed Mortgage Loans upon Foreclosure.”  This update affects creditors that hold government-guaranteed mortgage loans, including those guaranteed by the Federal Housing Administration (FHA) of the U.S.  Department of Housing and Urban Development (HUD), and the U.S. Department of Veterans Affairs (VA).  The update requires that, upon foreclosure, a guaranteed mortgage loan be derecognized and a separate other receivable be recognized when specific criteria are met.  ASU 2014-14 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2014. The adoption of this guidance did not have a significant impact on our consolidated financial statements.
	In April 2015, the FASB issued ASU 2015-05, “Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40) – Customer’s Accounting for Fees Paid in a Cloud Computing Arrangement.” ASU 2015-05 affects the accounting for fees paid by a customer in cloud computing arrangements such as (i) software as a service, (ii) platform as a service (iii) infrastructure as a service and (iv) other similar hosting arrangements. If a cloud computing arrangement includes a software license, then the customer should account for the software license element of the arrangement consistent with the acquisition of other software licenses. If a cloud computing arrangement does not include a software license, the customer should account for the arrangement as a service contract. ASU 2015-05 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. Early adoption is permitted. The adoption of this guidance is not expected to have a significant impact on our consolidated financial statements.

Acquisitions_Acquisitions_Tabl

Acquisitions Acquisitions (Tables)	3 Months Ended
	Mar. 31, 2015
Business Combinations [Abstract]
Business Combination, Segment Allocation [Table Text Block]	The following table reflects the changes in the carrying amount of our goodwill for the three months ended March 31, 2015 (in thousands):
		Goodwill
	Balance as of December 31, 2014	$	91,372
	Less: measurement period adjustments	(978		)
	Balance as of March 31, 2015	$	90,394

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Earnings per share on a basic and diluted basis	Earnings per share on a basic and diluted basis have been adjusted to give retroactive recognition to stock dividends and is calculated as follows (in thousands, except per share amounts):
		Three Months Ended March 31,
		2015		2014
	Basic and Diluted Earnings:
	Net income	$	9,379	$	8,224
	Basic weighted-average shares outstanding	25,322		19,761
	Add:   Stock awards	81		89
	Diluted weighted-average shares outstanding	25,403		19,850
	Basic Earnings Per Share:	$	0.37	$	0.41
	Diluted Earnings Per Share:	$	0.37	$	0.41

Accumulated_Other_Comprehensiv1

Accumulated Other Comprehensive (Loss) Income (Tables)	3 Months Ended
	Mar. 31, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Schedule of accumulated other comprehensive income (loss) by component	The changes in accumulated other comprehensive (loss) income by component are as follows (in thousands):
		Three Months Ended March 31, 2015
		Unrealized Gains (Losses) on Securities			Pension Plans
		Other			Net Prior			Net Gain (Loss)			Total
					Service
					(Cost)
					Credit
	Beginning balance, net of tax	$	6,238		$	7		$	(21,815	)	$	(15,570	)
	Other comprehensive income before reclassifications	9,802			—			—			9,802
	Reclassified to income	(2,476		)	(4		)	531			(1,949		)
	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	)
		Three Months Ended March 31, 2014
		Unrealized Gains (Losses) on Securities			Pension Plans
		Other			Net Prior			Net Gain (Loss)			Total
					Service
					(Cost)
					Credit
	Beginning balance, net of tax	$	(8,656	)	$	(12	)	$	(12,369	)	$	(21,037	)
	Other comprehensive income before reclassifications	10,287			—			—			10,287
	Reclassified to income	(11		)	(3		)	232			218
	Income tax (expense) benefit	(3,597		)	1			(81		)	(3,677		)
	Net current-period other comprehensive income (loss), net of tax	6,679			(2		)	151			6,828
	Ending balance, net of tax	$	(1,977	)	$	(14	)	$	(12,218	)	$	(14,209	)
Reclassifications out of accumulated other comprehensive income	The reclassifications out of accumulated other comprehensive income into net income are presented below (in thousands):
		Three Months Ended March 31,
		2015			2014
	Unrealized gains and losses on available for sale securities:
	Realized net gain on sale of securities (1)	$	2,476		$	11
	Tax expense	(867		)	(4		)
	Net of tax	$	1,609		$	7
	Amortization of pension plan:
	Net actuarial loss (2)	$	(531	)	$	(232	)
	Prior service credit (2)	4			3
	Total before tax	(527		)	(229		)
	Tax benefit	185			80
	Net of tax	$	(342	)	$	(149	)
	Total reclassifications for the period, net of tax	$	1,267		$	(142	)
	(1) Listed as net gain on sale of securities available for sale on the consolidated statements of income.
	(2) These accumulated other comprehensive income components are included in the computation of net periodic benefit cost presented in “Note 8 - Employee Benefit Plans.”

Securities_Tables

Securities (Tables)	3 Months Ended
	Mar. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Amortized cost and estimated fair value of investment and mortgage-backed securities	The amortized cost, carrying value, and estimated fair value of investment and mortgage-backed securities as of March 31, 2015 and December 31, 2014 are reflected in the tables below (in thousands):
			March 31, 2015
						Recognized in OCI									Not recognized in OCI
			Amortized			Gross			Gross Unrealized			Carrying			Gross			Gross Unrealized		Estimated
						Unrealized									Unrealized
	AVAILABLE FOR SALE		Cost			Gains			Losses			Value			Gains			Losses		Fair Value
	Investment Securities:
	U.S. Treasuries		$	24,646		$	507		$	—		$	25,153		$	—		$	—	$	25,153
	U.S. Government Agency Debentures		4,840			78			—			4,918			—			—		4,918
	State and Political Subdivisions		237,460			7,823			954			244,329			—			—		244,329
	Other Stocks and Bonds		13,089			140			—			13,229			—			—		13,229
	Other Equity Securities		6,061			45			—			6,106			—			—		6,106
	Mortgage-backed Securities: (1)
	Residential		791,207			15,459			197			806,469			—			—		806,469
	Commercial		328,813			5,240			382			333,671			—			—		333,671
	Total		$	1,406,116		$	29,292		$	1,533		$	1,433,875		$	—		$	—	$	1,433,875
	HELD TO MATURITY
	Investment Securities:
	State and Political Subdivisions		$	392,731		$	5,095		$	9,720		$	388,106		$	12,286		$	889	$	399,503
	Mortgage-backed Securities: (1)
	Residential		48,305			—			65			48,240			2,851			—		51,091
	Commercial		207,335			—			6,145			201,190			8,569			32		209,727
	Total		$	648,371		$	5,095		$	15,930		$	637,536		$	23,706		$	921	$	660,321
			December 31, 2014
						Recognized in OCI									Not recognized in OCI
			Amortized			Gross			Gross Unrealized			Carrying			Gross			Gross Unrealized		Estimated
						Unrealized									Unrealized
	AVAILABLE FOR SALE		Cost			Gains			Losses			Value			Gains			Losses		Fair Value
	Investment Securities:
	U.S. Treasuries		$	14,883		$	30		$	7		$	14,906		$	—		$	—	$	14,906
	U.S. Government Agency Debentures		4,835			—			7			4,828			—			—		4,828
	State and Political Subdivisions		260,535			8,055			906			267,684			—			—		267,684
	Other Stocks and Bonds		13,086			153			—			13,239			—			—		13,239
	Other Equity Securities		6,061			—			12			6,049			—			—		6,049
	Mortgage-backed Securities:(1)
	Residential		952,481			12,624			807			964,298			—			—		964,298
	Commercial		176,112			1,743			151			177,704			—			—		177,704
	Total		$	1,427,993		$	22,605		$	1,890		$	1,448,708		$	—		$	—	$	1,448,708
	HELD TO MATURITY
	Investment Securities:
	State and Political Subdivisions		$	393,525		$	5,168		$	9,870		$	388,823		$	12,181		$	756	$	400,248
	Mortgage-backed Securities:(1)
	Residential		52,287			—			70			52,217			2,871			—		55,088
	Commercial		207,624			—			6,345			201,279			5,461			489		206,251
	Total		$	653,436		$	5,168		$	16,285		$	642,319		$	20,513		$	1,245	$	661,587
	(1) All mortgage-backed securities issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.
Unrealized loss on securities	The following table represents the unrealized loss on securities as of March 31, 2015 and December 31, 2014 (in thousands):
		As of March 31, 2015
		Less Than 12 Months						More Than 12 Months						Total
		Fair Value			Unrealized			Fair Value			Unrealized			Fair Value			Unrealized
					Loss						Loss						Loss
	AVAILABLE FOR SALE
	Investment Securities:
	State and Political Subdivisions	$	38,943		$	325		$	23,758		$	629		$	62,701		$	954
	Mortgage-backed Securities:
	Residential	53,148			119			18,656			78			71,804			197
	Commercial	77,243			382			—			—			77,243			382
	Total	$	169,334		$	826		$	42,414		$	707		$	211,748		$	1,533
	HELD TO MATURITY
	Investment Securities:
	State and Political Subdivisions	$	10,955		$	98		$	57,230		$	791		$	68,185		$	889
	Mortgage-backed Securities:
	Commercial	—			—			6,638			32			6,638			32
	Total	$	10,955		$	98		$	63,868		$	823		$	74,823		$	921
		As of December 31, 2014
		Less Than 12 Months						More Than 12 Months						Total
		Fair Value			Unrealized			Fair Value			Unrealized			Fair Value			Unrealized
					Loss						Loss						Loss
	AVAILABLE FOR SALE
	Investment Securities:
	U.S. Treasuries	$	4,968		$	7		$	—		$	—		$	4,968		$	7
	U.S. Government Agency Debentures	4,828			7			—			—			4,828			7
	State and Political Subdivisions	28,155			90			44,269			816			72,424			906
	Other Equity Securities	6,049			12			—			—			6,049			12
	Mortgage-backed Securities:
	Residential	347,777			573			27,632			234			375,409			807
	Commercial	21,103			54			10,116			97			31,219			151
	Total	$	412,880		$	743		$	82,017		$	1,147		$	494,897		$	1,890
	HELD TO MATURITY
	Investment Securities:
	State and Political Subdivisions	$	7,843		$	31		$	64,946		$	725		$	72,789		$	756
	Mortgage-backed Securities:
	Commercial	—			—			44,144			489			44,144			489
	Total	$	7,843		$	31		$	109,090		$	1,214		$	116,933		$	1,245
Interest income recognized on securities	Interest income recognized on securities for the periods presented (in thousands):
		Three Months Ended March 31,
		2015			2014
	U.S. Treasury	$	116		$	—
	U.S. Government Agency Debentures	32			59
	State and Political Subdivisions	5,870			5,970
	Other Stocks and Bonds	84			52
	Mortgage-backed Securities	8,462			7,682
	Total interest income on securities	$	14,564		$	13,763
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, 2015, are presented below by contractual maturity.  Expected maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations.  MBS are presented in total by category due to the fact that MBS typically are issued with stated principal amounts, and the securities are backed by pools of mortgages that have loans with varying maturities.  The characteristics of the underlying pool of mortgages, such as fixed-rate or adjustable-rate, as well as prepayment risk, are passed on to the 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, 2015
		Amortized Cost			Fair Value
	AVAILABLE FOR SALE	(in thousands)
	Investment Securities:
	Due in one year or less	$	5,546		$	5,588
	Due after one year through five years	17,737			18,151
	Due after five years through ten years	73,069			74,408
	Due after ten years	183,683			189,482
		280,035			287,629
	Mortgage-backed Securities and Other Equity Securities:	1,126,081			1,146,246
	Total	$	1,406,116		$	1,433,875
		March 31, 2015
		Carrying Value			Fair Value
	HELD TO MATURITY	(in thousands)
	Investment Securities:
	Due in one year or less	$	1,078		$	1,081
	Due after one year through five years	2,927			3,047
	Due after five years through ten years	44,464			45,368
	Due after ten years	339,637			350,007
		388,106			399,503
	Mortgage-backed Securities:	249,430			260,818
	Total	$	637,536		$	660,321

Loans_and_Allowance_for_Probab1

Loans and Allowance for Probable Loan Losses (Tables)	3 Months Ended
	Mar. 31, 2015
Receivables [Abstract]
Classification of loans in the consolidated balance sheets	Loans in the accompanying consolidated balance sheets are classified as follows (in thousands):
		March 31, 2015			December 31, 2014
	Real Estate Loans:
	Construction	$	237,236		$	243,486
	1-4 Family Residential	691,955			689,288
	Other	502,476			485,226
	Commercial Loans	249,407			235,356
	Municipal Loans	252,756			257,492
	Loans to Individuals	240,784			270,285
	Total Loans (1)	2,174,614			2,181,133
	Less: Allowance for Loan Losses	16,926			13,292
	Net Loans	$	2,157,688		$	2,167,841
	(1) Includes approximately $727.7 million and $763.3 million of loans acquired with the Omni acquisition as of March 31, 2015 and December 31, 2014, respectively. These loans were measured at fair value at the acquisition date with no carryover of allowance for loan loss. The allowance for loan loss recorded on acquired loans for the three months ended March 31, 2015 was not significant.
Activity in the allowance for loan losses by portfolio segment	The following table details activity in the allowance for loan losses by portfolio segment for the periods presented (in thousands):
		Three Months Ended March 31, 2015
		Real Estate
		Construction			1-4 Family			Other			Commercial			Municipal		Loans to			Total
					Residential						Loans			Loans		Individuals
	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.
		Three Months Ended March 31, 2014
		Real Estate
		Construction			1-4 Family			Other			Commercial			Municipal		Loans to			Total
					Residential						Loans			Loans		Individuals
	Balance at beginning of period	$	2,142		$	3,277		$	2,572		$	1,970		$	668	$	8,248		$	18,877
	Provision (reversal) for loan losses	(10		)	536			(164		)	3			109		3,659			4,133
	Loans charged off	(14		)	(22		)	—			—			—		(4,732		)	(4,768		)
	Recoveries of loans charged off	12			6			3			58			—		466			545
	Balance at end of period	$	2,130		$	3,797		$	2,411		$	2,031		$	777	$	7,641		$	18,787
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, 2015
		Real Estate
		Construction (1)			1-4 Family			Other			Commercial			Municipal		Loans to			Total
					Residential						Loans			Loans		Individuals
	Ending balance – individually evaluated for impairment	$	123		$	47		$	35		$	3,601		$	201	$	36		$	4,043
	Ending balance – collectively evaluated for impairment	2,651			3,353			3,325			1,715			623		1,216			12,883
	Balance at end of period	$	2,774		$	3,400		$	3,360		$	5,316		$	824	$	1,252		$	16,926
	(1) Included in individually evaluated for impairment is $78,000 in allowance for loan loss for purchased credit impaired ("PCI") loans as of March 31, 2015.
		As of December 31, 2014
		Real Estate
		Construction			1-4 Family			Other			Commercial			Municipal		Loans to			Total
					Residential						Loans			Loans		Individuals
	Ending balance – individually evaluated for impairment	$	43		$	102		$	26		$	242		$	14	$	103		$	530
	Ending balance – collectively evaluated for impairment	2,413			2,720			2,999			3,037			702		891			12,762
	Balance at end of period	$	2,456		$	2,822		$	3,025		$	3,279		$	716	$	994		$	13,292
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, 2015
		Real Estate
		Construction			1-4 Family			Other			Commercial			Municipal		Loans to			Total
					Residential						Loans			Loans		Individuals
	Loans individually evaluated for impairment	$	2,375		$	2,069		$	3,006		$	15,278		$	949	$	126		$	23,803
	Loans collectively evaluated for impairment	234,088			682,659			496,464			224,723			251,807		239,773			2,129,514
	Purchased credit impaired loans	773			7,227			3,006			9,406			—		885			21,297
	Total ending loan balance	$	237,236		$	691,955		$	502,476		$	249,407		$	252,756	$	240,784		$	2,174,614
		December 31, 2014
		Real Estate
		Construction			1-4 Family			Other			Commercial			Municipal		Loans to			Total
					Residential						Loans			Loans		Individuals
	Loans individually evaluated for impairment	$	2,461		$	2,936		$	1,605		$	1,011		$	699	$	310		$	9,022
	Loans collectively evaluated for impairment (1)	240,240			679,051			480,619			225,168			256,793		268,894			2,150,765
	Purchased credit impaired loans (2)	785			7,301			3,002			9,177			—		1,081			21,346
	Total ending loan balance	$	243,486		$	689,288		$	485,226		$	235,356		$	257,492	$	270,285		$	2,181,133
	(1) Includes purchased non impaired loans which were measured at fair value at acquisition and did not have an associated allowance for loan loss as of December 31, 2014.
	(2) PCI loans were measured at fair value at acquisition and did not have an associated allowance for loan loss as of December 31, 2014.
Summary of loans by credit quality indicators	The following table sets forth loans by credit quality indicator for the periods presented (in thousands):
		March 31, 2015
		Pass			Pass Watch			Special Mention (1)			Substandard (1)			Doubtful (1)		Total
	Real Estate Loans:
	Construction	$	229,338		$	861		$	1,340		$	5,670		$	27	$	237,236
	1-4 Family Residential	682,231			1,439			1,692			5,534			1,059		691,955
	Other	491,551			—			2,544			8,381			—		502,476
	Commercial Loans	217,861			768			2,073			18,397			10,308		249,407
	Municipal Loans	251,807			—			—			699			250		252,756
	Loans to Individuals	239,716			13			—			621			434		240,784
	Total	$	2,112,504		$	3,081		$	7,649		$	39,302		$	12,078	$	2,174,614
	(1) Includes $1.5 million special mention, $4.6 million substandard, and $8.3 million doubtful of PCI loans as of March 31, 2015.
		December 31, 2014
		Pass			Pass Watch			Special Mention (1)			Substandard (1)			Doubtful		Total
	Real Estate Loans:
	Construction	$	235,839		$	862		$	1,394		$	5,363		$	28	$	243,486
	1-4 Family Residential	675,952			1,453			1,706			9,167			1,010		689,288
	Other	472,449			2,416			2,569			7,792			—		485,226
	Commercial Loans	208,202			781			1,044			25,102			227		235,356
	Municipal Loans	256,543			—			—			949			—		257,492
	Loans to Individuals	269,204			16			—			871			194		270,285
	Total	$	2,118,189		$	5,528		$	6,713		$	49,244		$	1,459	$	2,181,133
	(1) Includes $0.7 million special mention and $17.8 million substandard of PCI loans as of December 31, 2014.
Summary of nonperforming assets for the period	The following table sets forth nonperforming assets for the periods presented (in thousands):
		At			At
		March 31,			December 31,
		2015			2014
	Nonaccrual loans (1)	$	20,321		$	4,096
	Accruing loans past due more than 90 days (1)	1			4
	Restructured loans (1)	5,782			5,874
	Other real estate owned	985			1,738
	Repossessed assets	173			565
	Total Nonperforming Assets	$	27,262		$	12,277
	(1) Excludes PCI loans measured at fair value at acquisition.
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, 2015			December 31, 2014
	Real Estate Loans:
	Construction	$	631		$	716
	1-4 Family Residential	1,982			2,017
	Other	2,096			675
	Commercial Loans	14,717			416
	Municipal Loans	249			—
	Loans to Individuals	646			272
	Total	$	20,321		$	4,096
	(1) Excludes PCI loans measured at fair value at acquisition.
Summary of impaired loans by class of loans for the period	The following tables set forth impaired loans by class of loans for the periods presented (in thousands):
		March 31, 2015
		Unpaid Contractual Principal Balance			Recorded Investment With Allowance			Total Recorded Investment			Related
											Allowance for
											Loan Losses
	Real Estate Loans:
	Construction	$	3,113		$	2,375		$	2,375		$	45
	1-4 Family Residential	2,150			2,069			2,069			47
	Other	3,031			3,006			3,006			35
	Commercial Loans	16,758			15,278			15,278			3,601
	Municipal Loans	949			949			949			201
	Loans to Individuals	136			126			126			36
	Total	$	26,137		$	23,803		$	23,803		$	3,965
		December 31, 2014
		Unpaid			Recorded			Total			Related
		Contractual			Investment			Recorded			Allowance for
		Principal			With			Investment			Loan Losses
		Balance			Allowance
	Real Estate Loans:
	Construction	$	3,183		$	2,461		$	2,461		$	43
	1-4 Family Residential	4,023			3,854			3,854			108
	Other	1,622			1,605			1,605			26
	Commercial Loans	1,162			1,011			1,011			242
	Municipal Loans	699			699			699			14
	Loans to Individuals	321			310			310			103
	Total (1)	$	11,010		$	9,940		$	9,940		$	536
	(1) PCI loans are excluded from this table as there was no evidence of further deterioration in credit quality subsequent to the acquisition date that would indicate it is probable that our recorded investment in these loans would not be recoverable.
Aging of recorded investment in past due loans by class of loans	The following tables present the aging of the recorded investment in past due loans by class of loans (in thousands):
		March 31, 2015
		30-59 Days			60-89 Days			Greater than 90 Days Past Due			Total Past			Current (1)		Total
		Past Due			Past Due						Due
	Real Estate Loans:
	Construction	$	1,777		$	—		$	118		$	1,895		$	235,341	$	237,236
	1-4 Family Residential	6,329			589			306			7,224			684,731		691,955
	Other	1,793			54			179			2,026			500,450		502,476
	Commercial Loans	132			254			72			458			248,949		249,407
	Municipal Loans	2,763			—			—			2,763			249,993		252,756
	Loans to Individuals	2,974			423			415			3,812			236,972		240,784
	Total	$	15,768		$	1,320		$	1,090		$	18,178		$	2,156,436	$	2,174,614
		December 31, 2014
		30-59 Days Past Due			60-89 Days Past Due			Greater than 90 Days			Total Past			Current (1)		Total
								Past Due			Due
	Real Estate Loans:
	Construction	$	376		$	42		$	716		$	1,134		$	242,352	$	243,486
	1-4 Family Residential	3,511			509			2,017			6,037			683,251		689,288
	Other	1,203			—			675			1,878			483,348		485,226
	Commercial Loans	397			3			416			816			234,540		235,356
	Municipal Loans	—			—			—			—			257,492		257,492
	Loans to Individuals	362			66			276			704			269,581		270,285
	Total	$	5,849		$	620		$	4,100		$	10,569		$	2,170,564	$	2,181,133
	(1) Includes PCI loans measured at fair value at acquisition.
Average recorded investment and interest income on impaired loans	The following table sets forth interest income recognized on impaired loans by class of loans for the periods presented. Average recorded investment of impaired loans is reported on a year-to-date basis (in thousands):
		Three Months Ended
		March 31, 2015						March 31, 2014
		Average Recorded Investment (1)			Interest Income Recognized (1)			Average Recorded			Interest Income Recognized
								Investment
	Real Estate Loans:
	Construction	$	2,401		$	23		$	1,371		$	—
	1-4 Family Residential	4,000			17			2,471			12
	Other	1,945			13			1,717			12
	Commercial Loans	4,530			8			1,480			4
	Municipal Loans	761			10			759			—
	Loans to Individuals	462			—			3,099			32
	Total	$	14,099		$	71		$	10,897		$	60
	(1) Excludes PCI loans measured at fair value at acquisition.
Schedule of recorded investment in loans modified	The following tables set forth the recorded balance at March 31, 2015 and 2014 of loans considered to be TDRs that were restructured during the periods presented (dollars in thousands):
		Three Months Ended March 31, 2015
		Extend Amortization			Interest Rate Reductions			Combination (1)			Total Modifications			Number of Loans
		Period
	Real Estate Loans:
	1-4 Family Residential	$	—		$	—		$	266		$	266		2
	Other	31			—			—			31			1
	Commercial Loans	—			—			762			762			1
	Loans to Individuals	—			—			27			27			2
	Total	$	31		$	—		$	1,055		$	1,086		6
		Three Months Ended March 31, 2014
		Extend Amortization			Interest Rate Reductions			Combination (1)			Total Modifications			Number of Loans
		Period
	Real Estate Loans:
	1-4 Family Residential	—			286			—			286			1
	Other	338			—			25			363			2
	Commercial Loans	261			—			57			318			3
	Loans to Individuals	—			17			47			64			4
	Total	$	599		$	303		$	129		$	1,031		10
	(1) These modifications include an extension of the amortization period and interest rate reduction.
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, 2015			December 31, 2014
	Outstanding principal balance	$	31,584		$	32,572
	Carrying amount	$	21,297		$	21,346
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):
		March 31, 2015			31-Dec-14
	Balance at beginning of period	$	1,820		$	—
	Additions	—			—
	Additions due to acquisition	—			1,898
	Accretion	(524		)	(78		)
	Balance at end of period	$	1,296		$	1,820

Longterm_Obligations_Tables

Long-term Obligations (Tables)	3 Months Ended
	Mar. 31, 2015
Debt Disclosure [Abstract]
Summary of long-term obligation	Long-term obligations are summarized as follows (in thousands):
		March 31,		December 31,
		2015		2014
	FHLB Advances (1)	$	549,545	$	600,052
	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	$	609,856	$	660,363
	-1	At March 31, 2015, the weighted average cost of these advances was 1.32%.  Long-term FHLB Advances have maturities ranging from July 2016 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 3.2154% through June 29, 2015 and adjusts quarterly thereafter at a rate equal to three-month LIBOR plus 294 basis points.
	-4	This debt carries an adjustable rate of 1.5546% through April 29, 2015 and adjusts quarterly thereafter at a rate equal to three-month LIBOR plus 130 basis points.
	-5	This debt carries an adjustable rate of 2.5206% through June 14, 2015 and adjusts quarterly thereafter at a rate equal to three-month LIBOR plus 225 basis points.
	-6	This debt carries an adjustable rate of 2.0615% through May 25, 2015 and adjusts quarterly thereafter 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, 2015
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
The components of net periodic benefit cost	The components of net periodic benefit cost are as follows (in thousands):
		Three Months Ended March 31,
		Defined Benefit						Defined Benefit Pension Plan Acquired					Restoration
		Pension Plan											Plan
		2015			2014			2015			2014		2015		2014
	Service cost	$	476		$	448		$	—		$	—	$	73	$	69
	Interest cost	857			872			59			—		135		136
	Expected return on assets	(1,422		)	(1,412		)	(73		)	—		—		—
	Net actuarial loss recognition	383			131			—			—		148		101
	Prior service (credit) cost amortization	(6		)	(4		)	—			—		2		1
	Net periodic benefit cost	$	288		$	35		$	(14	)	$	—	$	358	$	307

Sharebased_Incentive_Plans_Tab

Share-based Incentive Plans (Tables)	3 Months Ended
	Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Summary of activity in share-based plans	The following table presents activity related to our RSUs and NQSOs as of March 31, 2015.
					Restricted Stock Units							Stock Options
					Outstanding							Outstanding
		Shares			Number			Weighted-				Number			Weighted-		Weighted-
		Available			of Shares			Average				of Shares			Average		Average
		for Grant						Grant-Date							Exercise		Grant-Date
								Fair Value							Price		Fair Value
	Balance, January 1, 2015	821,604			31,753			$	21.75			419,334			$	19.88	$	6
	Granted	(68,098	)		15,097			25.46				53,001			25.46		7.25
	Stock options exercised	—			—			—				(2,974	)		17.74		5.28
	Stock awards vested	—			—			—				—			—		—
	Forfeited	13,000			(1,700	)		25.23				(11,300	)		22.52		6.63
	Canceled/expired	—			—			—				—			—		—
	Balance, March 31, 2015	766,506			45,150			$	22.86			458,061			$	20.47	$	6.13
Other information regarding options outstanding and exercisable	Other information regarding options outstanding and exercisable as of March 31, 2015 is as follows:
							Options Outstanding									Options Exercisable
	Range of Exercise Prices						Number			Weighted-				Weighted-		Number	Weighted-
							of Shares			Average				Average Remaining		of Shares	Average
										Exercise				Contractual			Exercise
										Price				Life in Years			Price
	$	15.79		-	$25.46		458,061			$	20.47			7.77		203,905	$	18.42
	Total						458,061			$	20.47			7.77		203,905	$	18.42

Fair_Value_Measurement_Tables

Fair Value Measurement (Tables)	3 Months Ended
	Mar. 31, 2015
Fair Value Disclosures [Abstract]
Summary of fair value measurement on recurring and nonrecurring basis segregated by level of valuation inputs within fair value hierarchy utilized to measure fair value	The following tables summarize assets measured at fair value on a recurring and nonrecurring basis segregated by the level of the valuation inputs within the fair value hierarchy utilized to measure fair value (in thousands):
		As of March 31, 2015
				Fair Value Measurements at the End of the Reporting Period Using
		Carrying		Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
		Amount		(Level 1)		(Level 2)		(Level 3)
	Recurring fair value measurements
	Investment Securities:
	U.S. Treasuries	$	25,153	$	25,153	$	—	$	—
	U.S. Government Agency Debentures	4,918		—		4,918		—
	State and Political Subdivisions	244,329		—		244,329		—
	Other Stocks and Bonds	13,229		—		13,229		—
	Other Equity Securities	6,106		6,106		—		—
	Mortgage-backed Securities: (1)
	Residential	806,469		—		806,469		—
	Commercial	333,671		—		333,671		—
	Total recurring fair value measurements	$	1,433,875	$	31,259	$	1,402,616	$	—
	Nonrecurring fair value measurements
	Foreclosed assets	$	1,158	$	—	$	—	$	1,158
	Impaired loans (2)	19,838		—		—		19,838
	Total nonrecurring fair value measurements	$	20,996	$	—	$	—	$	20,996
		As of December 31, 2014
				Fair Value Measurements at the End of the Reporting Period Using
		Carrying		Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
		Amount		(Level 1)		(Level 2)		(Level 3)
	Recurring fair value measurements
	Investment Securities:
	U.S. Treasuries	$	14,906	$	14,906	$	—	$	—
	U.S. Government Agency Debentures	4,828		—		4,828		—
	State and Political Subdivisions	267,684		—		267,684		—
	Other Stocks and Bonds	13,239		—		13,239		—
	Other Equity Securities	6,049		6,049		—		—
	Mortgage-backed Securities: (1)
	Residential	964,298		—		964,298		—
	Commercial	177,704		—		177,704		—
	Total recurring fair value measurements	$	1,448,708	$	20,955	$	1,427,753	$	—
	Nonrecurring fair value measurements
	Foreclosed assets	$	2,303	$	—	$	—	$	2,303
	Impaired loans (2)	9,404		—		—		9,404
	Total nonrecurring fair value measurements	$	11,707	$	—	$	—	$	11,707
	-1	All mortgage-backed securities are issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.
	-2	Loans represent collateral dependent impaired loans with a specific valuation allowance. Losses on these loans represent charge-offs which are netted against the allowance for loan losses.
Financial assets, financial liabilities, and unrecognized financial instruments at carrying amount and fair value	The following tables present our financial assets, financial liabilities, and unrecognized financial instruments measured on a nonrecurring basis at both their respective carrying amounts and estimated fair value (in thousands):
				Estimated Fair Value
	March 31, 2015	Carrying		Total		Level 1		Level 2		Level 3
		Amount
	Financial Assets:
	Cash and cash equivalents	$	107,178	$	107,178	$	107,178	$	—	$	—
	Investment securities:
	Held to maturity, at carrying value	388,106		399,503		—		399,503		—
	Mortgage-backed securities:
	Held to maturity, at carrying value	249,430		260,818		—		260,818		—
	FHLB stock and other investments, at cost	45,237		45,237		—		45,237		—
	Loans, net of allowance for loan losses	2,157,688		2,129,587		—		—		2,129,587
	Loans held for sale	4,096		4,096		—		4,096		—
	Financial Liabilities:
	Retail deposits	$	3,495,340	$	3,493,430	$	—	$	3,493,430	$	—
	Federal funds purchased and repurchase agreements	2,127		2,127		—		2,127		—
	FHLB advances	690,789		683,933		—		683,933		—
	Long-term debt	60,311		43,844		—		43,844		—
				Estimated Fair Value
	December 31, 2014	Carrying		Total		Level 1		Level 2		Level 3
		Amount
	Financial Assets:
	Cash and cash equivalents	$	84,655	$	84,655	$	84,655	$	—	$	—
	Investment securities:
	Held to maturity, at carrying value	388,823		400,248		—		400,248		—
	Mortgage-backed securities:
	Held to maturity, at carrying value	253,496		261,339		—		261,339		—
	FHLB stock and other investments, at cost	43,871		43,871		—		43,871		—
	Loans, net of allowance for loan losses	2,167,841		2,140,088		—		—		2,140,088
	Loans held for sale	2,899		2,899		—		2,899		—
	Financial Liabilities:
	Retail deposits	$	3,374,417	$	3,369,784	$	—	$	3,369,784	$	—
	Federal funds purchased and repurchase agreements	4,237		4,237		—		4,237		—
	FHLB advances	897,420		886,087		—		886,087		—
	Long-term debt	60,311		43,860		—		43,860		—

Income_Taxes_Income_Taxes_Tabl

Income Taxes Income Taxes (Tables)	3 Months Ended
	Mar. 31, 2015
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 March 31,
		2015			2014
	Current income tax expense	$	3,438		$	2,016
	Deferred income tax (benefit) expense	(1,535		)	(857		)
	Income tax expense	$	1,903		$	1,159
	Net deferred tax assets totaled $11.0 million at March 31, 2015 and $12.7 million at December 31, 2014. The decrease in net deferred tax assets resulted from an increase in unrealized gains on securities available for sale. No valuation allowance for deferred tax assets was recorded at March 31, 2015 or December 31, 2014, as management believes it is more likely than not that all of the deferred tax assets will be realized in future years. There was approximately $50,000 in unrecognized tax benefits at March 31, 2015.
	We recognized income tax expense of $1.9 million, for an effective tax rate of 16.9%, for the three months ended March 31, 2015, compared to income tax expense of $1.2 million, for an effective tax rate of 12.4%, for the three months ended March 31, 2014. The higher effective tax rate for the three months ended March 31, 2015 was due to a decrease in tax-exempt income as a percentage of pre-tax income as compared to the same period in 2014. We file income tax returns in the U.S. federal jurisdiction and in certain states. We are no longer subject to U.S. federal income tax examinations by tax authorities for years before 2011.

OffBalanceSheet_Arrangements_C1

Off-Balance-Sheet Arrangements, Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Scheduled maturities of unused commitments	Financial instruments with off-balance-sheet risk were as follows (in thousands):
		At		At
		March 31,		December 31,
		2015		2014
	Unused commitments:
	Commitments to extend credit	$	425,712	$	373,255
	Standby letters of credit	6,387		6,222
	Total	$	432,099	$	379,477

Basis_of_Presentation_Stock_Di

Basis of Presentation - Stock Dividend Percentage (Details)	3 Months Ended	0 Months Ended
	Mar. 31, 2015	Apr. 13, 2015
	Rate
Subsequent Event [Line Items]
Stock dividend, declared	13-Apr-15
Stock dividend declared, percentage of common stock	5.00%
Stock dividend declared
Subsequent Event [Line Items]
Stock dividend, declared		13-Apr-15
Stock dividend declared, percentage of common stock		5.00%
Stock Dividends Payable, Date of Record		27-Apr-15
Stock Dividends Payable, Date to be Paid		14-May-15

Acquisitions_Acquisitions_Deta

Acquisitions - Acquisitions (Details) (USD $)	3 Months Ended	0 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 17, 2014
		banking_office
Goodwill [Roll Forward]
Balance as of December 31, 2014	$91,372
Less: measurement period adjustments	978
Balance as of March 31, 2015	90,394
OmniAmerican Bancorp, Inc.
Business Acquisition [Line Items]
Date of acquisition		17-Dec-14
Percentage of voting interests acquired		100.00%
Name of acquired entity		OmniAmerican Bancorp, Inc.
Number of banking offices		14
OmniAmerican Bancorp, Inc. | Other investments
Business Acquisition [Line Items]
Adjustment to the fair value of Visa Class B stock included in other investments	$1,400

Earnings_Per_Share_Earnings_Pe

Earnings Per Share - Earnings Per Share (Details) (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Basic and Diluted Earnings:
Net income	$9,379	$8,224
Basic weighted-average shares outstanding	25,322	19,761
Add: Stock awards	81	89
Diluted weighted-average shares outstanding	25,403	19,850
Basic Earnings Per Share:
Earnings per common share - basic (in dollars per share)	$0.37	$0.41
Diluted Earnings Per Share:
Earnings per common share - diluted (in dollars per share)	$0.37	$0.41
Antidilutive securities from non-qualified stock options excluded from calculating earnings
Number of antidilutive options (in shares)	10	26

Accumulated_Other_Comprehensiv2

Accumulated Other Comprehensive (Loss) Income - Accumulated Other Comprehensive Income, Changes In (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Accumulated Other Comprehensive Income by Component, Changes [Line Items]
Beginning balance, net of tax	($15,570)	($21,037)
Other comprehensive income before reclassifications	9,802	10,287
Reclassified to income	-1,949	218
Income tax (expense) benefit	-2,749	-3,677
Net current-period other comprehensive income (loss), net of tax	5,104	6,828
Ending balance, net of tax	-10,466	-14,209
Net other unrealized gains (Losses) on securities
Accumulated Other Comprehensive Income by Component, Changes [Line Items]
Beginning balance, net of tax	6,238	-8,656
Other comprehensive income before reclassifications	9,802	10,287
Reclassified to income	-2,476	-11
Income tax (expense) benefit	-2,564	-3,597
Net current-period other comprehensive income (loss), net of tax	4,762	6,679
Ending balance, net of tax	11,000	-1,977
Net Prior Service (Cost) Credit
Accumulated Other Comprehensive Income by Component, Changes [Line Items]
Beginning balance, net of tax	7	-12
Other comprehensive income before reclassifications	0	0
Reclassified to income	-4	-3
Income tax (expense) benefit	1	1
Net current-period other comprehensive income (loss), net of tax	-3	-2
Ending balance, net of tax	4	-14
Net Gain (Loss)
Accumulated Other Comprehensive Income by Component, Changes [Line Items]
Beginning balance, net of tax	-21,815	-12,369
Other comprehensive income before reclassifications	0	0
Reclassified to income	531	232
Income tax (expense) benefit	-186	-81
Net current-period other comprehensive income (loss), net of tax	345	151
Ending balance, net of tax	($21,470)	($12,218)

Accumulated_Other_Comprehensiv3

Accumulated Other Comprehensive (Loss) Income - Reclassifications out of Accumulated Other Comprehensive Income (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Realized net gain on sale of securities	$2,476		$11
Net actuarial loss	531		232
Prior service credit	-4		-3
Income before income tax expense	11,282		9,383
Tax (expense) benefit	-1,903		-1,159
Net of tax	9,379		8,224
Reclassification out of accumulated other comprehensive income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net of tax	1,267		-142
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	2,476	[1]	11	[1]
Tax (expense) benefit	-867		-4
Net of tax	1,609		7
Reclassification out of accumulated other comprehensive income | Amortization of pension plan items
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net actuarial loss	-531	[2]	-232	[2]
Prior service credit	4	[2]	3	[2]
Income before income tax expense	-527		-229
Tax (expense) benefit	185		80
Net of tax	($342)		($149)
[1]	Listed as net gain on sale of securities available for sale on the consolidated statements of income.
[2]	These accumulated other comprehensive income components are included in the computation of net periodic benefit cost presented in “Note 8 - Employee Benefit Plans.”

Securities_Schedule_of_Debt_an

Securities - Schedule of Debt and Equity Securities Components (Details) (USD $)	Mar. 31, 2015		Dec. 31, 2014
In Thousands, unless otherwise specified
AVAILABLE FOR SALE
Amortized cost	$1,406,116		$1,427,993
Gross unrealized gains, in OCI	29,292		22,605
Gross unrealized losses, in OCI	1,533		1,890
Estimated fair value	1,433,875		1,448,708
HELD TO MATURITY
Amortized cost	648,371		653,436
Gross unrealized gains, in OCI	5,095		5,168
Gross unrealized losses, in OCI	15,930		16,285
Carrying value	637,536		642,319
Gross unrealized gains, not in OCI	23,706		20,513
Gross unrealized losses, not in OCI	921		1,245
Estimated fair value	660,321		661,587
US Treasury
AVAILABLE FOR SALE
Amortized cost	24,646		14,883
Gross unrealized gains, in OCI	507		30
Gross unrealized losses, in OCI	0		7
Estimated fair value	25,153		14,906
US Government Agency Debentures
AVAILABLE FOR SALE
Amortized cost	4,840		4,835
Gross unrealized gains, in OCI	78		0
Gross unrealized losses, in OCI	0		7
Estimated fair value	4,918		4,828
State and Political Subdivisions
AVAILABLE FOR SALE
Amortized cost	237,460		260,535
Gross unrealized gains, in OCI	7,823		8,055
Gross unrealized losses, in OCI	954		906
Estimated fair value	244,329		267,684
HELD TO MATURITY
Amortized cost	392,731		393,525
Gross unrealized gains, in OCI	5,095		5,168
Gross unrealized losses, in OCI	9,720		9,870
Carrying value	388,106		388,823
Gross unrealized gains, not in OCI	12,286		12,181
Gross unrealized losses, not in OCI	889		756
Estimated fair value	399,503		400,248
Other Stocks and Bonds
AVAILABLE FOR SALE
Amortized cost	13,089		13,086
Gross unrealized gains, in OCI	140		153
Gross unrealized losses, in OCI	0		0
Estimated fair value	13,229		13,239
Other Equity Securities
AVAILABLE FOR SALE
Amortized cost	6,061		6,061
Gross unrealized gains, in OCI	45		0
Gross unrealized losses, in OCI	0		12
Estimated fair value	6,106		6,049
Residential MBS
AVAILABLE FOR SALE
Amortized cost	791,207	[1]	952,481	[1]
Gross unrealized gains, in OCI	15,459	[1]	12,624	[1]
Gross unrealized losses, in OCI	197	[1]	807	[1]
Estimated fair value	806,469	[1]	964,298	[1]
HELD TO MATURITY
Amortized cost	48,305	[1]	52,287	[1]
Gross unrealized gains, in OCI	0	[1]	0	[1]
Gross unrealized losses, in OCI	65	[1]	70	[1]
Carrying value	48,240	[1]	52,217	[1]
Gross unrealized gains, not in OCI	2,851	[1]	2,871	[1]
Gross unrealized losses, not in OCI	0	[1]	0	[1]
Estimated fair value	51,091	[1]	55,088	[1]
Commercial MBS
AVAILABLE FOR SALE
Amortized cost	328,813	[1]	176,112	[1]
Gross unrealized gains, in OCI	5,240	[1]	1,743	[1]
Gross unrealized losses, in OCI	382	[1]	151	[1]
Estimated fair value	333,671	[1]	177,704	[1]
HELD TO MATURITY
Amortized cost	207,335	[1]	207,624	[1]
Gross unrealized gains, in OCI	0	[1]	0	[1]
Gross unrealized losses, in OCI	6,145	[1]	6,345	[1]
Carrying value	201,190	[1]	201,279	[1]
Gross unrealized gains, not in OCI	8,569	[1]	5,461	[1]
Gross unrealized losses, not in OCI	32	[1]	489	[1]
Estimated fair value	$209,727	[1]	$206,251	[1]
[1]	All mortgage-backed securities issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.

Securities_Unrealized_Loss_on_

Securities - Unrealized Loss on Securities (Details) (USD $)	3 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months, fair value	$169,334	$412,880
More than 12 months, fair value	42,414	82,017
Total fair value	211,748	494,897
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss [Abstract]
Less than 12 months, unrealized loss	826	743
More than 12 months, unrealized loss	707	1,147
Total unrealized loss	1,533	1,890
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months, fair value	10,955	7,843
More than 12 months, fair value	63,868	109,090
Total fair value	74,823	116,933
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]
Less than 12 months, unrealized loss	98	31
More than 12 months, unrealized loss	823	1,214
Total unrealized loss	921	1,245
US Treasury
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months, fair value	0	4,968
More than 12 months, fair value	0	0
Total fair value	0	4,968
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss [Abstract]
Less than 12 months, unrealized loss	0	7
More than 12 months, unrealized loss	0	0
Total unrealized loss	0	7
US Government Agency Debentures
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months, fair value	0	4,828
More than 12 months, fair value	0	0
Total fair value	0	4,828
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss [Abstract]
Less than 12 months, unrealized loss	0	7
More than 12 months, unrealized loss	0	0
Total unrealized loss	0	7
State and Political Subdivisions
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months, fair value	38,943	28,155
More than 12 months, fair value	23,758	44,269
Total fair value	62,701	72,424
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss [Abstract]
Less than 12 months, unrealized loss	325	90
More than 12 months, unrealized loss	629	816
Total unrealized loss	954	906
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months, fair value	10,955	7,843
More than 12 months, fair value	57,230	64,946
Total fair value	68,185	72,789
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]
Less than 12 months, unrealized loss	98	31
More than 12 months, unrealized loss	791	725
Total unrealized loss	889	756
Other Equity Securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months, fair value	0	6,049
More than 12 months, fair value	0	0
Total fair value	0	6,049
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss [Abstract]
Less than 12 months, unrealized loss	0	12
More than 12 months, unrealized loss	0	0
Total unrealized loss	0	12
Residential MBS
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months, fair value	53,148	347,777
More than 12 months, fair value	18,656	27,632
Total fair value	71,804	375,409
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss [Abstract]
Less than 12 months, unrealized loss	119	573
More than 12 months, unrealized loss	78	234
Total unrealized loss	197	807
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months, fair value	0	0
More than 12 months, fair value	0	0
Total fair value	0	0
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]
Less than 12 months, unrealized loss	0	0
More than 12 months, unrealized loss	0	0
Total unrealized loss	0	0
Commercial MBS
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months, fair value	77,243	21,103
More than 12 months, fair value	0	10,116
Total fair value	77,243	31,219
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss [Abstract]
Less than 12 months, unrealized loss	382	54
More than 12 months, unrealized loss	0	97
Total unrealized loss	382	151
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 months, fair value	0	0
More than 12 months, fair value	6,638	44,144
Total fair value	6,638	44,144
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract]
Less than 12 months, unrealized loss	0	0
More than 12 months, unrealized loss	32	489
Total unrealized loss	$32	$489

Securities_Interest_Income_on_

Securities - Interest Income on Securities (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Interest income recognized on securities [Abstract]
U.S. Treasury	$116	$0
U.S. Government Agency Debentures	32	59
State and Political Subdivisions	5,870	5,970
Other Stocks and Bonds	84	52
Mortgage-backed Securities	8,462	7,682
Total interest income on securities	$14,564	$13,763

Securities_Amortized_Cost_and_

Securities - Amortized Cost and Estimated Fair Value of Investments in Debt Securities by Contractual Maturity (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Available-for-sale Securities, Amortized Cost Basis [Abstract]
Due in one year or less	$5,546
Due after one year through five years	17,737
Due after five years through ten years	73,069
Due after ten years	183,683
Total available-for-sale investment securities, amortized cost	280,035
Mortgage-backed Securities and Other Equity Securities:	1,126,081
Total	1,406,116
Available-for-sale Securities, Fair Value, Fiscal Year Maturity [Abstract]
Due in one year or less	5,588
Due after one year through five years	18,151
Due after five years through ten years	74,408
Due after ten years	189,482
Total available-for-sale investment securities	287,629
Mortgage-backed Securities and Other Equity Securities:	1,146,246
Total	1,433,875	1,448,708
Held to Maturity Securities, Amortized Amount [Abstract]
Due in one year or less	1,078
Due after one year through five years	2,927
Due after five years through ten years	44,464
Due after ten years	339,637
Total held-to-maturity investment securities	388,106
Mortgage-backed securities	249,430
Carrying value	637,536	642,319
Held to Maturity Securities, Fair Value [Abstract]
Due in one year or less	1,081
Due after one year through five years	3,047
Due after five years through ten years	45,368
Due after ten years	350,007
Total held-to-maturity investment securities	399,503
Mortgage-backed securities	260,818
Total	$660,321

Securities_Narrative_Details

Securities - Narrative (Details) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]
Net realized gain on AFS securities	$2,500,000	$11,000
Realized gains	2,500,000	2,900,000
Realized losses	54,000	2,900,000
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	$1,090,000,000		$1,120,000,000

Loans_and_Allowance_for_Probab2

Loans and Allowance for Probable Loan Losses - Loans by Portfolio Segment (Details) (USD $)	Mar. 31, 2015		Dec. 31, 2014
Loans and Leases Receivable Disclosure [Abstract]
Total ending loans balance	$2,174,614,000	[1]	$2,181,133,000	[1]
Less: Allowance for loan losses	16,926,000		13,292,000
Net loans	2,157,688,000		2,167,841,000
Construction
Loans and Leases Receivable Disclosure [Abstract]
Total ending loans balance	237,236,000		243,486,000
1-4 Family Residential
Loans and Leases Receivable Disclosure [Abstract]
Total ending loans balance	691,955,000		689,288,000
Other
Loans and Leases Receivable Disclosure [Abstract]
Total ending loans balance	502,476,000		485,226,000
Commercial Loans
Loans and Leases Receivable Disclosure [Abstract]
Total ending loans balance	249,407,000		235,356,000
Municipal Loans
Loans and Leases Receivable Disclosure [Abstract]
Total ending loans balance	252,756,000		257,492,000
Loans to Individuals
Loans and Leases Receivable Disclosure [Abstract]
Total ending loans balance	240,784,000		270,285,000
OmniAmerican Bancorp, Inc.
Loans and Financing Receivable [Line Items]
Loans acquired carrying amount	$727,700,000		$763,300,000
[1]	Includes approximately $727.7 million and $763.3 million of loans acquired with the Omni acquisition as of March 31, 2015 and December 31, 2014, respectively. These loans were measured at fair value at the acquisition date with no carryover of allowance for loan loss.

Loans_and_Allowance_for_Probab3

Loans and Allowance for Probable Loan Losses - Allowance for Loan Losses Activity by Portfolio Segment (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014
Change in Allowances for Loan Losses [Abstract]
Balance at beginning of period	$13,292	[1]	$18,877
Provision (reversal) for loan losses	3,848		4,133
Loans charged off	-1,086		-4,768
Recoveries of loans charged off	872		545
Balance at end of period	16,926		18,787
Construction
Change in Allowances for Loan Losses [Abstract]
Balance at beginning of period	2,456	[1]	2,142
Provision (reversal) for loan losses	275		-10
Loans charged off	0		-14
Recoveries of loans charged off	43		12
Balance at end of period	2,774	[2]	2,130
1-4 Family Residential
Change in Allowances for Loan Losses [Abstract]
Balance at beginning of period	2,822	[1]	3,277
Provision (reversal) for loan losses	573		536
Loans charged off	-6		-22
Recoveries of loans charged off	11		6
Balance at end of period	3,400		3,797
Other
Change in Allowances for Loan Losses [Abstract]
Balance at beginning of period	3,025	[1]	2,572
Provision (reversal) for loan losses	269		-164
Loans charged off	0		0
Recoveries of loans charged off	66		3
Balance at end of period	3,360		2,411
Commercial Loans
Change in Allowances for Loan Losses [Abstract]
Balance at beginning of period	3,279	[1]	1,970
Provision (reversal) for loan losses	2,065		3
Loans charged off	-57		0
Recoveries of loans charged off	29		58
Balance at end of period	5,316		2,031
Municipal Loans
Change in Allowances for Loan Losses [Abstract]
Balance at beginning of period	716	[1]	668
Provision (reversal) for loan losses	108		109
Loans charged off	0		0
Recoveries of loans charged off	0		0
Balance at end of period	824		777
Loans to Individuals
Change in Allowances for Loan Losses [Abstract]
Balance at beginning of period	994	[1]	8,248
Provision (reversal) for loan losses	558		3,659
Loans charged off	-1,023		-4,732
Recoveries of loans charged off	723		466
Balance at end of period	$1,252		$7,641
[1]	Loans acquired with the Omni acquisition were measured at fair value on December 17, 2014 with no carryover of allowance for loan loss.
[2]	Included in individually evaluated for impairment is $78,000 in allowance for loan loss for purchased credit impaired ("PCI") loans as of March 31, 2015.

Loans_and_Allowance_for_Probab4

Loans and Allowance for Probable Loan Losses - Allowance Balance, by Impairment Method (Details) (USD $)	Mar. 31, 2015		Dec. 31, 2014		Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule of Allowance For Loan Losses, Allowance Balance, by Impairment Method [Line Items]
Ending balance - individually evaluated for impairment	$4,043		$530
Ending balance - collectively evaluated for impairment	12,883		12,762
Balance at end of period	16,926		13,292	[1]	18,787	18,877
Allowance for loan loss for purchased credit impaired loans	78
Construction
Schedule of Allowance For Loan Losses, Allowance Balance, by Impairment Method [Line Items]
Ending balance - individually evaluated for impairment	123	[2]	43
Ending balance - collectively evaluated for impairment	2,651	[2]	2,413
Balance at end of period	2,774	[2]	2,456	[1]	2,130	2,142
1-4 Family Residential
Schedule of Allowance For Loan Losses, Allowance Balance, by Impairment Method [Line Items]
Ending balance - individually evaluated for impairment	47		102
Ending balance - collectively evaluated for impairment	3,353		2,720
Balance at end of period	3,400		2,822	[1]	3,797	3,277
Other
Schedule of Allowance For Loan Losses, Allowance Balance, by Impairment Method [Line Items]
Ending balance - individually evaluated for impairment	35		26
Ending balance - collectively evaluated for impairment	3,325		2,999
Balance at end of period	3,360		3,025	[1]	2,411	2,572
Commercial Loans
Schedule of Allowance For Loan Losses, Allowance Balance, by Impairment Method [Line Items]
Ending balance - individually evaluated for impairment	3,601		242
Ending balance - collectively evaluated for impairment	1,715		3,037
Balance at end of period	5,316		3,279	[1]	2,031	1,970
Municipal Loans
Schedule of Allowance For Loan Losses, Allowance Balance, by Impairment Method [Line Items]
Ending balance - individually evaluated for impairment	201		14
Ending balance - collectively evaluated for impairment	623		702
Balance at end of period	824		716	[1]	777	668
Loans to Individuals
Schedule of Allowance For Loan Losses, Allowance Balance, by Impairment Method [Line Items]
Ending balance - individually evaluated for impairment	36		103
Ending balance - collectively evaluated for impairment	1,216		891
Balance at end of period	$1,252		$994	[1]	$7,641	$8,248
[1]	Loans acquired with the Omni acquisition were measured at fair value on December 17, 2014 with no carryover of allowance for loan loss.
[2]	Included in individually evaluated for impairment is $78,000 in allowance for loan loss for purchased credit impaired ("PCI") loans as of March 31, 2015.

Loans_and_Allowance_for_Probab5

Loans and Allowance for Probable Loan Losses - Allowance for Loan Losses, Loan Portfolio, by Impairment Method (Details) (USD $)	Mar. 31, 2015		Dec. 31, 2014
In Thousands, unless otherwise specified
Schedule of Allowance For Loan Losses, Loan Balance, by Impairment Method [Line Items]
Loans individually evaluated for impairment	$23,803		$9,022
Loans collectively evaluated for impairment	2,129,514		2,150,765	[1]
Purchased credit impaired loans	21,297		21,346	[2]
Total ending loans balance	2,174,614	[3]	2,181,133	[3]
Construction
Schedule of Allowance For Loan Losses, Loan Balance, by Impairment Method [Line Items]
Loans individually evaluated for impairment	2,375		2,461
Loans collectively evaluated for impairment	234,088		240,240	[1]
Purchased credit impaired loans	773		785	[2]
Total ending loans balance	237,236		243,486
1-4 Family Residential
Schedule of Allowance For Loan Losses, Loan Balance, by Impairment Method [Line Items]
Loans individually evaluated for impairment	2,069		2,936
Loans collectively evaluated for impairment	682,659		679,051	[1]
Purchased credit impaired loans	7,227		7,301	[2]
Total ending loans balance	691,955		689,288
Other
Schedule of Allowance For Loan Losses, Loan Balance, by Impairment Method [Line Items]
Loans individually evaluated for impairment	3,006		1,605
Loans collectively evaluated for impairment	496,464		480,619	[1]
Purchased credit impaired loans	3,006		3,002	[2]
Total ending loans balance	502,476		485,226
Commercial Loans
Schedule of Allowance For Loan Losses, Loan Balance, by Impairment Method [Line Items]
Loans individually evaluated for impairment	15,278		1,011
Loans collectively evaluated for impairment	224,723		225,168	[1]
Purchased credit impaired loans	9,406		9,177	[2]
Total ending loans balance	249,407		235,356
Municipal Loans
Schedule of Allowance For Loan Losses, Loan Balance, by Impairment Method [Line Items]
Loans individually evaluated for impairment	949		699
Loans collectively evaluated for impairment	251,807		256,793	[1]
Purchased credit impaired loans	0		0	[2]
Total ending loans balance	252,756		257,492
Loans to Individuals
Schedule of Allowance For Loan Losses, Loan Balance, by Impairment Method [Line Items]
Loans individually evaluated for impairment	126		310
Loans collectively evaluated for impairment	239,773		268,894	[1]
Purchased credit impaired loans	885		1,081	[2]
Total ending loans balance	$240,784		$270,285
[1]	Includes purchased non impaired loans which were measured at fair value at acquisition and did not have an associated allowance for loan loss as of December 31, 2014.
[2]	PCI loans were measured at fair value at acquisition and did not have an associated allowance for loan loss as of December 31, 2014.
[3]	Includes approximately $727.7 million and $763.3 million of loans acquired with the Omni acquisition as of March 31, 2015 and December 31, 2014, respectively. These loans were measured at fair value at the acquisition date with no carryover of allowance for loan loss.

Loans_and_Allowance_for_Probab6

Loans and Allowance for Probable Loan Losses - Loans by Credit Quality Indicator (Details) (USD $)	Mar. 31, 2015		Dec. 31, 2014
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance	$2,174,614	[1]	$2,181,133	[1]
Purchased credit impaired loans	21,297		21,346
Pass
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance	2,112,504		2,118,189
Pass Watch
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance	3,081		5,528
Special Mention
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance	7,649	[2]	6,713	[3]
Purchased credit impaired loans	1,500	[2]	700	[2]
Substandard
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance	39,302	[2]	49,244	[3]
Purchased credit impaired loans	4,600	[2]	17,800	[2]
Doubtful
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance	12,078	[2]	1,459
Purchased credit impaired loans	8,300	[2]
Construction
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance	237,236		243,486
Construction | Pass
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance	229,338		235,839
Construction | Pass Watch
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance	861		862
Construction | Special Mention
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance	1,340	[2]	1,394	[3]
Construction | Substandard
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance	5,670	[2]	5,363	[3]
Construction | Doubtful
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance	27	[2]	28
1-4 Family Residential
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance	691,955		689,288
1-4 Family Residential | Pass
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance	682,231		675,952
1-4 Family Residential | Pass Watch
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance	1,439		1,453
1-4 Family Residential | Special Mention
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance	1,692	[2]	1,706	[3]
1-4 Family Residential | Substandard
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance	5,534	[2]	9,167	[3]
1-4 Family Residential | Doubtful
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance	1,059	[2]	1,010
Other
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance	502,476		485,226
Other | Pass
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance	491,551		472,449
Other | Pass Watch
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance	0		2,416
Other | Special Mention
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance	2,544	[2]	2,569	[3]
Other | Substandard
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance	8,381	[2]	7,792	[3]
Other | Doubtful
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance	0	[2]	0
Commercial Loans
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance	249,407		235,356
Commercial Loans | Pass
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance	217,861		208,202
Commercial Loans | Pass Watch
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance	768		781
Commercial Loans | Special Mention
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance	2,073	[2]	1,044	[3]
Commercial Loans | Substandard
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance	18,397	[2]	25,102	[3]
Commercial Loans | Doubtful
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance	10,308	[2]	227
Municipal Loans
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance	252,756		257,492
Municipal Loans | Pass
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance	251,807		256,543
Municipal Loans | Pass Watch
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance	0		0
Municipal Loans | Special Mention
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance	0	[2]	0	[3]
Municipal Loans | Substandard
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance	699	[2]	949	[3]
Municipal Loans | Doubtful
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance	250	[2]	0
Loans to Individuals
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance	240,784		270,285
Loans to Individuals | Pass
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance	239,716		269,204
Loans to Individuals | Pass Watch
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance	13		16
Loans to Individuals | Special Mention
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance	0	[2]	0	[3]
Loans to Individuals | Substandard
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance	621	[2]	871	[3]
Loans to Individuals | Doubtful
Financing Receivable, Recorded Investment, Credit Quality Indicator [Abstract]
Total ending loans balance	$434	[2]	$194
[1]	Includes approximately $727.7 million and $763.3 million of loans acquired with the Omni acquisition as of March 31, 2015 and December 31, 2014, respectively. These loans were measured at fair value at the acquisition date with no carryover of allowance for loan loss.
[2]	Includes $1.5 million special mention, $4.6 million substandard, and $8.3 million doubtful of PCI loans as of March 31, 2015.
[3]	Includes $0.7 million special mention and $17.8 million substandard of PCI loans as of December 31, 2014.

Loans_and_Allowance_for_Probab7

Loans and Allowance for Probable Loan Losses - Nonperforming Assets by Asset Class (Details) (USD $)	Mar. 31, 2015		Dec. 31, 2014
In Thousands, unless otherwise specified
Nonperforming Assets by Asset Class [Abstract]
Nonaccrual loans	$20,321	[1]	$4,096	[1]
Accruing loans past due more than 90 days	1	[1]	4	[1]
Restructured loans	5,782	[1]	5,874	[1]
Other real estate owned	985		1,738
Repossessed assets	173		565
Total nonperforming assets	$27,262		$12,277
[1]	Excludes PCI loans measured at fair value at acquisition.

Loans_and_Allowance_for_Probab8

Loans and Allowance for Probable Loan Losses - Nonaccrual and Accruing Loans Past Due More Than 90 Days by Class (Details) (USD $)	Mar. 31, 2015		Dec. 31, 2014
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	$20,321	[1]	$4,096	[1]
Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	631	[1]	716	[1]
1-4 Family Residential
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	1,982	[1]	2,017	[1]
Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	2,096	[1]	675	[1]
Commercial Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	14,717	[1]	416	[1]
Municipal Loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	249	[1]	0	[1]
Loans to Individuals
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	$646	[1]	$272	[1]
[1]	Excludes PCI loans measured at fair value at acquisition.

Loans_and_Allowance_for_Probab9

Loans and Allowance for Probable Loan Losses - Impaired Loans by Class of Loan (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Impaired Financing Receivable, Recorded Investment [Abstract]
Unpaid contractual principal balance	$26,137	$11,010	[1]
Recorded investment with allowance	23,803	9,940	[1]
Total Recorded Investment	23,803	9,940	[1]
Related Allowance for Loan Losses	3,965	536	[1]
Construction
Impaired Financing Receivable, Recorded Investment [Abstract]
Unpaid contractual principal balance	3,113	3,183
Recorded investment with allowance	2,375	2,461
Total Recorded Investment	2,375	2,461
Related Allowance for Loan Losses	45	43
1-4 Family Residential
Impaired Financing Receivable, Recorded Investment [Abstract]
Unpaid contractual principal balance	2,150	4,023
Recorded investment with allowance	2,069	3,854
Total Recorded Investment	2,069	3,854
Related Allowance for Loan Losses	47	108
Other
Impaired Financing Receivable, Recorded Investment [Abstract]
Unpaid contractual principal balance	3,031	1,622
Recorded investment with allowance	3,006	1,605
Total Recorded Investment	3,006	1,605
Related Allowance for Loan Losses	35	26
Commercial Loans
Impaired Financing Receivable, Recorded Investment [Abstract]
Unpaid contractual principal balance	16,758	1,162
Recorded investment with allowance	15,278	1,011
Total Recorded Investment	15,278	1,011
Related Allowance for Loan Losses	3,601	242
Municipal Loans
Impaired Financing Receivable, Recorded Investment [Abstract]
Unpaid contractual principal balance	949	699
Recorded investment with allowance	949	699
Total Recorded Investment	949	699
Related Allowance for Loan Losses	201	14
Loans to Individuals
Impaired Financing Receivable, Recorded Investment [Abstract]
Unpaid contractual principal balance	136	321
Recorded investment with allowance	126	310
Total Recorded Investment	126	310
Related Allowance for Loan Losses	$36	$103
[1]	PCI loans are excluded from this table as there was no evidence of further deterioration in credit quality subsequent to the acquisition date that would indicate it is probable that our recorded investment in these loans would not be recoverable.

Recovered_Sheet1

Loans and Allowance for Probable Loan Losses - Aging of Past Due Loans by Class of Loan (Details) (USD $)	Mar. 31, 2015		Dec. 31, 2014
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment, Past Due [Abstract]
30-59 Days Past Due	$15,768		$5,849
60-89 Days Past Due	1,320		620
Greater than 90 Days Past Due	1,090		4,100
Total Past Due	18,178		10,569
Current	2,156,436	[1]	2,170,564	[1]
Total ending loans balance	2,174,614	[2]	2,181,133	[2]
Construction
Financing Receivable, Recorded Investment, Past Due [Abstract]
30-59 Days Past Due	1,777		376
60-89 Days Past Due	0		42
Greater than 90 Days Past Due	118		716
Total Past Due	1,895		1,134
Current	235,341	[1]	242,352	[1]
Total ending loans balance	237,236		243,486
1-4 Family Residential
Financing Receivable, Recorded Investment, Past Due [Abstract]
30-59 Days Past Due	6,329		3,511
60-89 Days Past Due	589		509
Greater than 90 Days Past Due	306		2,017
Total Past Due	7,224		6,037
Current	684,731	[1]	683,251	[1]
Total ending loans balance	691,955		689,288
Other
Financing Receivable, Recorded Investment, Past Due [Abstract]
30-59 Days Past Due	1,793		1,203
60-89 Days Past Due	54		0
Greater than 90 Days Past Due	179		675
Total Past Due	2,026		1,878
Current	500,450	[1]	483,348	[1]
Total ending loans balance	502,476		485,226
Commercial Loans
Financing Receivable, Recorded Investment, Past Due [Abstract]
30-59 Days Past Due	132		397
60-89 Days Past Due	254		3
Greater than 90 Days Past Due	72		416
Total Past Due	458		816
Current	248,949	[1]	234,540	[1]
Total ending loans balance	249,407		235,356
Municipal Loans
Financing Receivable, Recorded Investment, Past Due [Abstract]
30-59 Days Past Due	2,763		0
60-89 Days Past Due	0		0
Greater than 90 Days Past Due	0		0
Total Past Due	2,763		0
Current	249,993	[1]	257,492	[1]
Total ending loans balance	252,756		257,492
Loans to Individuals
Financing Receivable, Recorded Investment, Past Due [Abstract]
30-59 Days Past Due	2,974		362
60-89 Days Past Due	423		66
Greater than 90 Days Past Due	415		276
Total Past Due	3,812		704
Current	236,972	[1]	269,581	[1]
Total ending loans balance	$240,784		$270,285
[1]	Includes PCI loans measured at fair value at acquisition.
[2]	Includes approximately $727.7 million and $763.3 million of loans acquired with the Omni acquisition as of March 31, 2015 and December 31, 2014, respectively. These loans were measured at fair value at the acquisition date with no carryover of allowance for loan loss.

Recovered_Sheet2

Loans and Allowance for Probable Loan Losses - Interest Income on Impaired Loans (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014
Impaired Financing Receivable, Average Recorded Investment and Interest Income on Impaired Loans [Abstract]
Average recorded investment	$14,099	[1]	$10,897
Interest income recognized	71	[1]	60
Construction
Impaired Financing Receivable, Average Recorded Investment and Interest Income on Impaired Loans [Abstract]
Average recorded investment	2,401	[1]	1,371
Interest income recognized	23	[1]	0
1-4 Family Residential
Impaired Financing Receivable, Average Recorded Investment and Interest Income on Impaired Loans [Abstract]
Average recorded investment	4,000	[1]	2,471
Interest income recognized	17	[1]	12
Other
Impaired Financing Receivable, Average Recorded Investment and Interest Income on Impaired Loans [Abstract]
Average recorded investment	1,945	[1]	1,717
Interest income recognized	13	[1]	12
Commercial Loans
Impaired Financing Receivable, Average Recorded Investment and Interest Income on Impaired Loans [Abstract]
Average recorded investment	4,530	[1]	1,480
Interest income recognized	8	[1]	4
Municipal Loans
Impaired Financing Receivable, Average Recorded Investment and Interest Income on Impaired Loans [Abstract]
Average recorded investment	761	[1]	759
Interest income recognized	10	[1]	0
Loans to Individuals
Impaired Financing Receivable, Average Recorded Investment and Interest Income on Impaired Loans [Abstract]
Average recorded investment	462	[1]	3,099
Interest income recognized	$0	[1]	$32
[1]	Excludes PCI loans measured at fair value at acquisition.

Recovered_Sheet3

Loans and Allowance for Probable Loan Losses - Troubled Debt Restructurings (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014
	contract		contract
Troubled Debt Restructuring [Abstract]
Extend Amortization Period	$31		$599
Interest Rate Reductions	0		303
Combination	1,055	[1]	129	[1]
Total Modifications	1,086		1,031
Number of Loans	6		10
1-4 Family Residential
Troubled Debt Restructuring [Abstract]
Extend Amortization Period	0		0
Interest Rate Reductions	0		286
Combination	266	[1]	0	[1]
Total Modifications	266		286
Number of Loans	2		1
Other
Troubled Debt Restructuring [Abstract]
Extend Amortization Period	31		338
Interest Rate Reductions	0		0
Combination	0	[1]	25	[1]
Total Modifications	31		363
Number of Loans	1		2
Commercial Loans
Troubled Debt Restructuring [Abstract]
Extend Amortization Period	0		261
Interest Rate Reductions	0		0
Combination	762	[1]	57	[1]
Total Modifications	762		318
Number of Loans	1		3
Loans to Individuals
Troubled Debt Restructuring [Abstract]
Extend Amortization Period	0		0
Interest Rate Reductions	0		17
Combination	27	[1]	47	[1]
Total Modifications	$27		$64
Number of Loans	2		4
[1]	These modifications include an extension of the amortization period and interest rate reduction.

Recovered_Sheet4

Loans and Allowance for Probable Loan Losses - Purchased Credit Impaired (Details) (USD $)	3 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Purchased Credit Impaired [Abstract]
Outstanding principal balance	$31,584	$32,572
Carrying Amount	21,297	21,346
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance at beginning of period	1,820	0
Additions	0	0
Additions due to acquisition	0	1,898
Accretion	-524	-78
Balance at end of period	$1,296	$1,820

Recovered_Sheet5

Loans and Allowance for Probable Loan Losses - Narrative (Details) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Receivables [Abstract]
Financing Receivable, significant sales			$70,300,000
Financing receivable, significant purchases, net of discount		20,800,000
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	37,000
Material defaults	0	0
Loans and leases receivable, impaired, commitment to lend	$0	$0

Longterm_Obligations_Longterm_

Long-term Obligations - Long-term Obligations (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014
	Rate
Debt Instruments [Abstract]
FHLB advances	$549,545	[1]	$600,052	[1]
Long-term debt	60,311	[2]	60,311	[2]
Total long-term obligations	609,856		660,363
Federal Home Loan Bank Advances
Advances from Federal Home Loan Banks [Abstract]
Weighted average cost (in hundredths)	1.32%
Maturity date range, earliest	25-Jul-16
Maturity date range, latest	3-Jul-28
Southside Statutory Trust III
Debt Instruments [Abstract]
Long-term debt	20,619	[2],[3]	20,619	[2]
Long-term Debt, Other Disclosures [Abstract]
Maturity date	2033
Adjusted rate of debt	3.22%
Date of interest rate adjustment	29-Jun-15
Debt instrument, description of variable rate basis	three-month LIBOR plus 294 basis points
Southside Statutory Trust IV
Debt Instruments [Abstract]
Long-term debt	23,196	[2],[4]	23,196	[2]
Long-term Debt, Other Disclosures [Abstract]
Maturity date	2037
Adjusted rate of debt	1.55%
Date of interest rate adjustment	29-Apr-15
Debt instrument, description of variable rate basis	three-month LIBOR plus 130 basis points
Southside Statutory Trust V
Debt Instruments [Abstract]
Long-term debt	12,887	[2],[5]	12,887	[2]
Long-term Debt, Other Disclosures [Abstract]
Maturity date	2037
Adjusted rate of debt	2.52%
Date of interest rate adjustment	14-Jun-15
Debt instrument, description of variable rate basis	three-month LIBOR plus 225 basis points
Magnolia Trust Company I
Debt Instruments [Abstract]
Long-term debt	$3,609	[2],[6]	$3,609	[2]
Long-term Debt, Other Disclosures [Abstract]
Maturity date	2035
Adjusted rate of debt	2.06%
Date of interest rate adjustment	25-May-15
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, 2015, the weighted average cost of these advances was 1.32%. Long-term FHLB Advances have maturities ranging from July 2016 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 3.2154% through June 29, 2015 and adjusts quarterly thereafter at a rate equal to three-month LIBOR plus 294 basis points.
[4]	This debt carries an adjustable rate of 1.5546% through April 29, 2015 and adjusts quarterly thereafter at a rate equal to three-month LIBOR plus 130 basis points.
[5]	This debt carries an adjustable rate of 2.5206% through June 14, 2015 and adjusts quarterly thereafter at a rate equal to three-month LIBOR plus 225 basis points.
[6]	This debt carries an adjustable rate of 2.0615% through May 25, 2015 and adjusts quarterly thereafter at a rate equal to three-month LIBOR plus 180 basis points.

Employee_Benefit_Plans_Employe

Employee Benefit Plans - Employee Benefit Plans (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Defined Benefit Pension Plan
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	$476	$448
Interest cost	857	872
Expected return on assets	-1,422	-1,412
Net actuarial loss recognition	383	131
Prior service (credit) cost amortization	-6	-4
Net periodic benefit cost	288	35
Pension and Other Postretirement Benefit Contributions [Abstract]
Pension and other postretirement benefit contributions	0
Defined Benefit Pension Plan Acquired
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	0	0
Interest cost	59	0
Expected return on assets	-73	0
Net actuarial loss recognition	0	0
Prior service (credit) cost amortization	0	0
Net periodic benefit cost	-14	0
Pension and Other Postretirement Benefit Contributions [Abstract]
Pension and other postretirement benefit contributions	0
Restoration Plan
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	73	69
Interest cost	135	136
Expected return on assets	0	0
Net actuarial loss recognition	148	101
Prior service (credit) cost amortization	2	1
Net periodic benefit cost	358	307
Pension and Other Postretirement Benefit Contributions [Abstract]
Pension and other postretirement benefit contributions	$60

Sharebased_Incentive_Plans_Sha

Share-based Incentive Plans - Share-based Incentive Plans Narrative (Details) (2009 Incentive Plan, USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares reserved and available for issuance (in shares)	1,407,103
Nonvested awards outstanding (in shares)	299,306	424,169
Share-based compensation expense	$273,000	$286,000
Income tax benefit related to stock compensation expense	95,000	100,000
Unrecognized compensation expense	2,200,000	2,800,000
Unrecognized compensation cost, weighted-average period for recognition	2 years 9 months 20 days
Stock compensation issued from available authorized shares (in shares)	2,974	2,515
Nonqualified Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total intrinsic value of stock options outstanding	3,100,000
Total intrinsic value of exercisable stock options	1,800,000
Cash received from exercise of stock options	53,000	42,000
Total intrinsic value of stock options exercised	$28,000	$24,000
Nonqualified Stock Options | Three Year Vesting Schedule
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual term	10 years
Nonqualified Stock Options | Four Year Vesting Schedule
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual term	10 years
Nonqualified Stock Options | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Nonqualified Stock Options | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	4 years
Restricted Stock Units (RSUs) | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Restricted Stock Units (RSUs) | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	4 years

Sharebased_Incentive_Plans_Sha1

Share-based Incentive Plans - Share-based Incentive Plans, Activity (Details) (USD $)	3 Months Ended
	Mar. 31, 2015
Shares Available for Grant for All Share-based Plans [Roll Forward]
Balance, January 1, 2015 (shares)	821,604
Granted (shares)	-68,098
Stock awards vested (shares)	0
Forfeited (shares)	13,000
Canceled/expired (shares)	0
Balance, March 31, 2015 (shares)	766,506
Restricted Stock Units (RSUs)
Number of shares
Balance, January 1, 2015 (shares)	31,753
Granted (shares)	15,097
Stock awards vested (shares)	0
Forfeited (shares)	-1,700
Canceled/expired (shares)	0
Balance, March 31, 2015 (shares)	45,150
Weighted- Average Grant-Date Fair Value
Balance, January 1, 2015 (in dollars per share)	21.75
Granted (in dollars per share)	25.46
Stock awards vested (in dollars per share)	0
Forfeited (in dollars per share)	25.23
Canceled/expired (in dollars per share)	0
Balance, March 31, 2015 (in dollars per share)	22.86
Employee Stock Option
Number of shares
Balance, January 1, 2015 (shares)	419,334
Granted (shares)	53,001
Stock options exercised (shares)	-2,974
Stock awards vested (shares)	0
Forfeited (shares)	-11,300
Canceled/expired (shares)	0
Balance, March 31, 2015 (shares)	458,061
Weighted- Average Exercise Price
Balance, January 1, 2015 (in dollars per share)	19.88
Granted (in dollars per share)	25.46
Stock options exercised (in dollars per share)	17.74
Forfeited (in dollars per share)	22.52
Canceled/expired (in dollars per share)	0
Balance, March 31, 2015 (in dollars per share)	20.47
Weighted- Average Grant-Date Fair Value
Balance, January 1, 2015 (in dollars per share)	6
Granted (in dollars per share)	7.25
Stock options exercised (in dollars per share)	5.28
Stock awards vested (in dollars per share)	0
Forfeited (in dollars per share)	6.63
Canceled/expired (in dollars per share)	0
Balance, March 31, 2015 (in dollars per share)	6.13

Sharebased_Incentive_Plans_Sha2

Share-based Incentive Plans - Share-based Incentive Plans, Stock Options Exercise Price Range (Details) (USD $)	3 Months Ended
	Mar. 31, 2015
Shares Outstanding
Number of shares	458,061
Weighted- average exercise price (in dollars per share)	$20.47
Weighted- average remaining contractual term (in years)	7 years 9 months 7 days
Options Exercisable
Number of shares	203,905
Weighted- average exercise price (in dollars per share)	$18.42
$15.79 - $25.46
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, lower range limit (in dollars per share)	$15.79
Range of exercise prices, upper range limit (in dollars per share)	$25.46
Shares Outstanding
Number of shares	458,061
Weighted- average exercise price (in dollars per share)	$20.47
Weighted- average remaining contractual term (in years)	7 years 9 months 7 days
Options Exercisable
Number of shares	203,905
Weighted- average exercise price (in dollars per share)	$18.42

Fair_Value_Measurement_Fair_Va

Fair Value Measurement - Fair Value Measurements, Recurring and Nonrecurring Basis (Details) (USD $)	Mar. 31, 2015		Dec. 31, 2014
In Thousands, unless otherwise specified
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Recurring	$31,259		$20,955
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	0	[1]	0	[1]
Level 1 | US Treasury
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Recurring	25,153		14,906
Level 1 | US Government Agency Debentures
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Recurring	0		0
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	6,106		6,049
Level 1 | Residential MBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Recurring	0	[2]	0	[2]
Level 1 | Commercial MBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Recurring	0	[2]	0	[2]
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Recurring	1,402,616		1,427,753
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	0	[1]	0	[1]
Level 2 | US Treasury
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Recurring	0		0
Level 2 | US Government Agency Debentures
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Recurring	4,918		4,828
Level 2 | State and Political Subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Recurring	244,329		267,684
Level 2 | Other Stocks and Bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Recurring	13,229		13,239
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 MBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Recurring	806,469	[2]	964,298	[2]
Level 2 | Commercial MBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Recurring	333,671	[2]	177,704	[2]
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Recurring	0		0
Assets, Fair Value Disclosure, Nonrecurring	20,996		11,707
Level 3 | Foreclosed assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Nonrecurring	1,158		2,303
Level 3 | Impaired loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Nonrecurring	19,838	[1]	9,404	[1]
Level 3 | US Treasury
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Recurring	0		0
Level 3 | US Government Agency Debentures
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 MBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Recurring	0	[2]	0	[2]
Level 3 | Commercial MBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Recurring	0	[2]	0	[2]
Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Recurring	1,433,875		1,448,708
Assets, Fair Value Disclosure, Nonrecurring	20,996		11,707
Carrying Amount | Foreclosed assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Nonrecurring	1,158		2,303
Carrying Amount | Impaired loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Nonrecurring	19,838	[1]	9,404	[1]
Carrying Amount | US Treasury
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Recurring	25,153		14,906
Carrying Amount | US Government Agency Debentures
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Recurring	4,918		4,828
Carrying Amount | State and Political Subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Recurring	244,329		267,684
Carrying Amount | Other Stocks and Bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Recurring	13,229		13,239
Carrying Amount | Other Equity Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Recurring	6,106		6,049
Carrying Amount | Residential MBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Recurring	806,469	[2]	964,298	[2]
Carrying Amount | Commercial MBS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Recurring	$333,671	[2]	$177,704	[2]
[1]	Loans represent collateral dependent impaired loans with a specific valuation allowance. Losses on these loans represent charge-offs which are netted against the allowance for loan losses.
[2]	All mortgage-backed securities are issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.

Fair_Value_Measurement_Fair_Va1

Fair Value Measurement - Fair Value, Balance Sheet Grouping (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Investment securities:
Held to maturity, at carrying value	$399,503	$400,248
Mortgage-backed securities:
Held to maturity, at carrying value	260,818	261,339
Level 1
Financial Assets:
Cash and cash equivalents	107,178	84,655
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	399,503	400,248
Mortgage-backed securities:
Held to maturity, at carrying value	260,818	261,339
FHLB stock and other investments, at cost	45,237	43,871
Loans, net of allowance for loan losses	0	0
Loans held for sale	4,096	2,899
Financial Liabilities:
Retail deposits	3,493,430	3,369,784
Federal funds purchased and repurchase agreements	2,127	4,237
FHLB advances	683,933	886,087
Long-term debt	43,844	43,860
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	2,129,587	2,140,088
Loans held for sale	0	0
Financial Liabilities:
Retail deposits	0	0
Federal funds purchased and repurchase agreements	0	0
FHLB advances	0	0
Long-term debt	0	0
Carrying Amount
Financial Assets:
Cash and cash equivalents	107,178	84,655
Investment securities:
Held to maturity, at carrying value	388,106	388,823
Mortgage-backed securities:
Held to maturity, at carrying value	249,430	253,496
FHLB stock and other investments, at cost	45,237	43,871
Loans, net of allowance for loan losses	2,157,688	2,167,841
Loans held for sale	4,096	2,899
Financial Liabilities:
Retail deposits	3,495,340	3,374,417
Federal funds purchased and repurchase agreements	2,127	4,237
FHLB advances	690,789	897,420
Long-term debt	60,311	60,311
Estimated Fair Value
Financial Assets:
Cash and cash equivalents	107,178	84,655
Investment securities:
Held to maturity, at carrying value	399,503	400,248
Mortgage-backed securities:
Held to maturity, at carrying value	260,818	261,339
FHLB stock and other investments, at cost	45,237	43,871
Loans, net of allowance for loan losses	2,129,587	2,140,088
Loans held for sale	4,096	2,899
Financial Liabilities:
Retail deposits	3,493,430	3,369,784
Federal funds purchased and repurchase agreements	2,127	4,237
FHLB advances	683,933	886,087
Long-term debt	$43,844	$43,860

Income_Taxes_Provision_for_Inc

Income Taxes - Provision for Income Taxes (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Income Tax Disclosure [Abstract]
Current income tax expense	$3,438	$2,016
Deferred income tax (benefit) expense	-1,535	-857
Income tax expense	$1,903	$1,159

Income_Taxes_Narrative_Details

Income Taxes - Narrative (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Net deferred tax assets	$11,000,000		$12,700,000
Deferred tax assets, valuation allowance	0		0
Unrecognized tax benefits	50,000
Income tax expense	$1,903,000	$1,159,000
Effective income tax rate, percent	16.90%	12.40%

OffBalanceSheet_Arrangements_C2

- Off-Balance-Sheet Arrangements, Commitments and Contingencies (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
In Thousands, unless otherwise specified
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial instruments with off-balance-sheet risk, at fair value	$432,099	$379,477
Securities:
Unsettled trades to purchase securities	13,096	5,982	1,032
Unsettled trades to sell securities	1,792	57,202	0
Deposits:
Unsettled issuances of brokered CDs	0	0
Standby Letters of Credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial instruments with off-balance-sheet risk, at fair value	6,387	6,222
Commitments to Extend Credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial instruments with off-balance-sheet risk, at fair value	$425,712	$373,255