WesBanco (WSBC) 10-Q 25 Jul 14 2014 Q2 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	6 Months Ended
	Jun. 30, 2014	Jul. 21, 2014
Document And Entity Information [Abstract]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	30-Jun-14	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q2	'
Entity Registrant Name	'WESBANCO INC	'
Entity Central Index Key	'0000203596	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Large Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	29,278,925

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
ASSETS	'	'
Cash and due from banks, including interest bearing amounts of $12,698 and $15,550, respectively	$94,488	$95,551
Securities:	'	'
Available-for-sale, at fair value	1,006,079	934,386
Held-to-maturity (fair values of $628,540 and $596,308, respectively)	607,695	598,520
Total securities	1,613,774	1,532,906
Loans held for sale	10,641	5,855
Portfolio loans, net of unearned income	3,946,118	3,894,917
Allowance for loan losses	-45,741	-47,368
Net portfolio loans	3,900,377	3,847,549
Premises and equipment, net	92,106	93,157
Accrued interest receivable	19,087	18,960
Goodwill and other intangible assets, net	320,449	321,426
Bank-owned life insurance	121,878	121,390
Other assets	104,220	107,979
Total Assets	6,277,020	6,144,773
Deposits:	'	'
Non-interest bearing demand	1,021,414	960,814
Interest bearing demand	871,487	857,761
Money market	969,518	942,768
Savings deposits	829,155	789,709
Certificates of deposit	1,425,829	1,511,478
Total deposits	5,117,403	5,062,530
Federal Home Loan Bank borrowings	138,596	39,508
Other short-term borrowings	94,745	150,536
Junior subordinated debt owed to unconsolidated subsidiary trusts	106,156	106,137
Total borrowings	339,497	296,181
Accrued interest payable	2,306	2,354
Other liabilities	39,189	37,113
Total Liabilities	5,498,395	5,398,178
SHAREHOLDERS' EQUITY	'	'
Preferred stock, no par value; 1,000,000 shares authorized; none outstanding	0	0
Common stock, $2.0833 par value; 50,000,000 shares authorized; 29,367,511 issued in 2014 and 2013, respectively; outstanding: 29,278,925 and 29,175,236 shares in 2014 and 2013, respectively	61,182	61,182
Capital surplus	244,029	244,974
Retained earnings	482,786	460,351
Treasury stock (88,586 and 192,275 shares in 2014 and 2013, respectively, at cost)	-2,748	-5,969
Accumulated other comprehensive loss	-5,393	-12,734
Deferred benefits for directors	-1,231	-1,209
Total Shareholders' Equity	778,625	746,595
Total Liabilities and Shareholders' Equity	$6,277,020	$6,144,773

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, except Share data, unless otherwise specified
Statement Of Financial Position [Abstract]	'	'
Interest bearing deposits, banks	$12,698	$15,550
Held-to-maturity securities, fair values	$628,540	$596,308
Preferred stock, no par value	'	'
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares outstanding	0	0
Common stock, par value	$2.08	$2.08
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	29,367,511	29,367,511
Common stock, shares outstanding	29,278,925	29,175,236
Treasury stock, shares	88,586	192,275

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	3 Months Ended		6 Months Ended
In Thousands, except Share data, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
INTEREST AND DIVIDEND INCOME	'	'	'	'
Loans, including fees	$42,546	$43,753	$85,291	$88,029
Interest and dividends on securities:	'	'	'	'
Taxable	7,452	7,357	14,676	14,790
Tax-exempt	3,435	3,264	6,821	6,392
Total interest and dividends on securities	10,887	10,621	21,497	21,182
Other interest income	611	50	713	106
Total interest and dividend income	54,044	54,424	107,501	109,317
INTEREST EXPENSE	'	'	'	'
Interest bearing demand deposits	395	365	768	666
Money market deposits	466	338	907	677
Savings deposits	133	127	263	268
Certificates of deposit	3,422	5,881	7,052	12,029
Total interest expense on deposits	4,416	6,711	8,990	13,640
Federal Home Loan Bank borrowings	175	289	386	609
Other short-term borrowings	350	627	907	1,249
Junior subordinated debt owed to unconsolidated subsidiary trusts	796	808	1,587	1,701
Total interest expense	5,737	8,435	11,870	17,199
NET INTEREST INCOME	48,307	45,989	95,631	92,118
Provision for credit losses	849	1,021	3,048	3,123
Net interest income after provision for credit losses	47,458	44,968	92,583	88,995
NON-INTEREST INCOME	'	'	'	'
Trust fees	5,210	4,823	10,858	9,840
Service charges on deposits	4,078	4,462	7,937	8,659
Electronic banking fees	3,267	3,195	6,281	6,062
Net securities brokerage revenue	2,003	1,641	3,832	3,138
Bank-owned life insurance	1,821	880	2,695	2,829
Net gains on sales of mortgage loans	475	701	628	1,413
Net securities gains	165	686	175	702
Net (loss) / gain on other real estate owned and other assets	-165	101	-52	55
Other income	1,387	1,235	2,936	2,522
Total non-interest income	18,241	17,724	35,290	35,220
NON-INTEREST EXPENSE	'	'	'	'
Salaries and wages	16,904	15,772	33,370	31,599
Employee benefits	5,529	5,813	11,238	12,158
Net occupancy	2,857	2,830	6,348	6,022
Equipment	2,914	2,802	5,698	5,209
Marketing	1,713	1,624	2,716	2,429
FDIC insurance	880	919	1,757	1,890
Amortization of intangible assets	482	561	977	1,186
Restructuring and merger-related expense	'	51	'	1,229
Other operating expenses	9,025	9,127	18,294	18,524
Total non-interest expense	40,304	39,499	80,398	80,246
Income before provision for income taxes	25,395	23,193	47,475	43,969
Provision for income taxes	6,520	6,176	12,179	10,932
NET INCOME	18,875	17,017	35,296	33,037
EARNINGS PER COMMON SHARE	'	'	'	'
Basic	$0.65	$0.58	$1.21	$1.13
Diluted	$0.64	$0.58	$1.20	$1.13
AVERAGE COMMON SHARES OUTSTANDING	'	'	'	'
Basic	29,242,180	29,245,201	29,212,347	29,228,355
Diluted	29,321,927	29,308,806	29,293,424	29,288,018
DIVIDENDS DECLARED PER COMMON SHARE	$0.22	$0.19	$0.44	$0.38
COMPREHENSIVE INCOME	$22,943	$6,493	$42,637	$22,073

Consolidated_Statements_of_Cha

Consolidated Statements of Changes in Shareholders' Equity (USD $)	Total	Common Stock [Member]	Capital Surplus [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Deferred Benefits for Directors [Member]
In Thousands, except Share data
Beginning Balance at Dec. 31, 2012	$714,184	$60,863	$241,672	$419,246	'	($6,365)	($1,232)
Beginning Balance, Shares at Dec. 31, 2012	'	29,214,660	'	'	'	'	'
Net income	33,037	'	'	33,037	'	'	'
Other comprehensive income (loss)	-10,964	'	'	'	'	-10,964	'
Comprehensive income	22,073	'	'	'	'	'	'
Common dividends declared (0.44 and 0.38 per share in June 30, 2014 and 2013 respectively)	-11,115	'	'	-11,115	'	'	'
Treasury shares acquired	-296	'	'	'	-296	'	'
Treasury shares acquired, Shares	'	-11,851	'	'	'	'	'
Stock options exercised	1,018	94	897	'	27	'	'
Stock options exercised, Shares	'	46,025	'	'	'	'	'
Restricted stock granted	0	57	-326	'	269	'	'
Restricted stock granted, Shares	'	38,250	'	'	'	'	'
Adjustment to shares issued in acquisition	-104	-9	-95	'	'	'	'
Adjustment to shares issued in acquisition, Shares	'	-4,672	'	'	'	'	'
Stock compensation expense	472	'	472	'	'	'	'
Deferred benefits for directors- net	0	'	20	'	'	'	-20
Ending Balance at Jun. 30, 2013	726,232	61,005	242,640	441,168	0	-17,329	-1,252
Ending Balance, Shares at Jun. 30, 2013	'	29,282,412	'	'	'	'	'
Beginning Balance at Dec. 31, 2013	746,595	61,182	244,974	460,351	-5,969	-12,734	-1,209
Beginning Balance, Shares at Dec. 31, 2013	'	29,175,236	'	'	'	'	'
Net income	35,296	'	'	35,296	'	'	'
Other comprehensive income (loss)	7,341	'	'	'	'	7,341	'
Comprehensive income	42,637	'	'	'	'	'	'
Common dividends declared (0.44 and 0.38 per share in June 30, 2014 and 2013 respectively)	-12,861	'	'	-12,861	'	'	'
Treasury shares acquired	-20	'	49	'	-69	'	'
Treasury shares acquired, Shares	'	-2,258	'	'	'	'	'
Stock options exercised	1,658	'	-311	'	1,969	'	'
Stock options exercised, Shares	'	63,393	'	'	'	'	'
Restricted stock granted	0	'	-1,321	'	1,321	'	'
Restricted stock granted, Shares	'	42,554	'	'	'	'	'
Stock compensation expense	616	'	616	'	'	'	'
Deferred benefits for directors- net	0	'	22	'	'	'	-22
Ending Balance at Jun. 30, 2014	$778,625	$61,182	$244,029	$482,786	($2,748)	($5,393)	($1,231)
Ending Balance, Shares at Jun. 30, 2014	'	29,278,925	'	'	'	'	'

Consolidated_Statements_of_Cha1

Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) (USD $)	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Common dividends declared, per share	$0.44	$0.38
Retained Earnings [Member]	'	'
Common dividends declared, per share	$0.44	$0.38

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013
Statement Of Cash Flows [Abstract]	'	'
NET CASH PROVIDED BY OPERATING ACTIVITIES	$41,380	$66,015
INVESTING ACTIVITIES	'	'
Net increase in loans	-55,683	-115,220
Securities available-for-sale:	'	'
Proceeds from sales	3,491	9,265
Proceeds from maturities, prepayments and calls	117,595	147,472
Purchases of securities	-182,501	-126,546
Securities held-to-maturity:	'	'
Proceeds from maturities, prepayments and calls	18,982	57,719
Purchases of securities	-29,704	-65,576
Purchases of premises and equipment - net	-2,659	-3,989
Net cash used in investing activities	-130,479	-96,875
FINANCING ACTIVITIES	'	'
Increase (decrease) in deposits	55,248	-6,176
Proceeds from Federal Home Loan Bank borrowings	115,532	'
Repayment of Federal Home Loan Bank borrowings	-16,368	-50,415
(Decrease) increase in other short-term borrowings	-35,609	1,813
(Decrease) increase in federal funds purchased	-20,000	56,000
Repayment of junior subordinated debt	'	-7,732
Dividends paid to common shareholders	-12,256	-10,811
Treasury shares sold (purchased) - net	1,489	-274
Issuance of common stock	'	920
Net cash provided by (used in) financing activities	88,036	-16,675
Net decrease in cash and cash equivalents	-1,063	-47,535
Cash and cash equivalents at beginning of the period	95,551	125,605
Cash and cash equivalents at end of the period	94,488	78,070
SUPPLEMENTAL DISCLOSURES	'	'
Interest paid on deposits and other borrowings	12,532	17,549
Income taxes paid	7,850	11,425
Transfers of loans to other real estate owned	$1,610	$1,084

Summary_of_Significant_Account

Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2014
Accounting Policies [Abstract]	'
Summary of Significant Accounting Policies	'
	NOTE 1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
	Basis of presentation — The accompanying unaudited interim financial statements of WesBanco, Inc. and its consolidated subsidiaries (“WesBanco”) have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) for interim financial information and the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements and should be read in conjunction with our Annual Report on Form 10-K for the year ended December 31, 2013.
	WesBanco’s interim financial statements have been prepared following the significant accounting policies disclosed in Note 1 of the Notes to the Consolidated Financial Statements of its 2013 Annual Report on Form 10-K filed with the Securities and Exchange Commission. In the opinion of management, the accompanying interim financial information reflects all adjustments, including normal recurring adjustments, necessary to present fairly WesBanco’s financial position and results of operations for each of the interim periods presented. Results of operations for interim periods are not necessarily indicative of the results of operations that may be expected for a full year.
	Recent accounting pronouncements — In June 2014, the Financial Accounting Standards Board (the “FASB”) issued an Accounting Standards Update (“ASU”) (ASU 2014-11) related to repurchase-to-maturity transactions, repurchase financing and disclosures. The pronouncement changes the accounting for repurchase-to-maturity transactions and linked repurchase financings to secured borrowing accounting, which is consistent with the accounting for other repurchase agreements. The pronouncement also requires two new disclosures. The first disclosure requires an entity to disclose information on transfers accounted for as sales in transactions that are economically similar to repurchase agreements. The second disclosure provides increased transparency about the types of collateral pledged in repurchase agreements and similar transactions accounted for as secured borrowings. The pronouncement is effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2014. Early adoption is not permitted. The adoption of this pronouncement is not expected to have a material impact on WesBanco’s Consolidated Financial Statements.
	In May 2014, the FASB issued an accounting pronouncement (ASU 2014-09) related to the recognition of revenue from contracts with customers. The new revenue pronouncement creates a single source of revenue guidance for all companies in all industries and is more principles-based than current revenue guidance. The pronouncement provides a five-step model for a company to recognize revenue when it transfers control of goods or services to customers at an amount that reflects the consideration to which it expects to be entitled in exchange for those goods or services. The five steps are (1) identify the contract with the customer, (2) identify the separate performance obligations in the contract, (3) determine the transaction price, (4) allocate the transaction price to the separate performance obligations and (5) recognize revenue when each performance obligation is satisfied. The pronouncement is effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2016 using either a full retrospective approach for all periods presented in the period of adoption or a modified retrospective approach. Early adoption is not permitted. WesBanco is currently evaluating the impact of the adoption of this pronouncement on its Consolidated Financial Statements.
	In January 2014, the FASB issued an accounting pronouncement (ASU 2014-04) related to in-substance repossessions and foreclosures. The pronouncement clarifies when an in-substance repossession or foreclosure occurs. A creditor is considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan, upon either (1) the creditor obtaining legal title to the residential real estate property upon completion of a foreclosure or (2) the borrower conveying all interest in the residential real estate property to the creditor to satisfy that loan through completion of a deed in lieu of foreclosure or through a similar legal agreement. Additionally, the amendments require interim and annual disclosure of both (1) the amount of foreclosed residential real estate property held by the creditor and (2) the recorded investment in consumer mortgage loans collateralized by residential real estate property that are in the process of foreclosure according to local requirements of the applicable jurisdiction. The pronouncement is effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2014 and may be adopted under either a modified retrospective transition method or a prospective transition method. Early adoption is permitted. The adoption of this pronouncement is not expected to have a material impact on WesBanco’s Consolidated Financial Statements.
	In January 2014, the FASB issued an accounting pronouncement (ASU 2014-01) which applies to all reporting entities that invest in qualified affordable housing projects through limited liability entities. The pronouncement permits reporting entities to make an accounting policy election to account for these investments using the proportional amortization method if certain conditions exist. The pronouncement also requires disclosure that enables users of its financial statements to understand the nature of these investments. Under the proportional amortization method, an entity amortizes the initial cost of the investment in proportion to the tax credits and other tax benefits received and recognizes the net investment performance in the income statement as a component of income tax expense (benefit). The pronouncement should be applied retrospectively for all periods presented, effective for annual periods and interim reporting periods within those annual periods, beginning after December 15, 2014. Early adoption is permitted. The adoption of this pronouncement is not expected to have a material impact on WesBanco’s Consolidated Financial Statements.
	In July 2013, the FASB issued an accounting pronouncement (ASU 2013-11) to improve the reporting for unrecognized tax benefits when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists. The pronouncement is expected to reduce diversity in practice by providing guidance on the presentation of unrecognized tax benefits and will better reflect the manner in which an entity would settle at the reporting date any additional income taxes that would result from the disallowance of a tax position when net operating loss carryforwards, similar tax losses, or tax credit carryforwards exist. The pronouncement is effective prospectively for fiscal years, and interim periods within those years, beginning after December 15, 2013. The adoption of this pronouncement did not have a material impact on WesBanco’s Consolidated Financial Statements.

Earnings_Per_Common_Share

Earnings Per Common Share	6 Months Ended
	Jun. 30, 2014
Earnings Per Share [Abstract]	'
Earnings Per Common Share	'
	NOTE 2. EARNINGS PER COMMON SHARE
	Earnings per common share are calculated as follows:
		For the Three Months Ended				For the Six Months Ended
		June 30,				June 30,
	(unaudited, in thousands, except shares and per share amounts)	2014		2013		2014		2013
	Numerator for both basic and diluted earnings per common share:
	Net income	$	18,875	$	17,017	$	35,296	$	33,037
	Denominator:
	Total average basic common shares outstanding		29,242,180		29,245,201		29,212,347		29,228,355
	Effect of dilutive stock options and warrant		79,747		63,605		81,077		59,663
	Total diluted average common shares outstanding		29,321,927		29,308,806		29,293,424		29,288,018
	Earnings per common share - basic	$	0.65	$	0.58	$	1.21	$	1.13
	Earnings per common share - diluted	$	0.64	$	0.58	$	1.2	$	1.13
	Stock options representing shares of 179,335 for the three months ended June 30, 2013, and shares of 180,969 for the six months ended June 30, 2013, were not included in the computation of diluted earnings per share, because to do so would have been anti-dilutive. For the three and six months ended June 30, 2014, all outstanding options were dilutive.

Securities

Securities	6 Months Ended
	Jun. 30, 2014
Investments Debt And Equity Securities [Abstract]	'
Securities	'
	NOTE 3. SECURITIES
	The following table presents the fair value and amortized cost of available-for-sale and held-to-maturity securities:
			June 30, 2014										December 31, 2013
	(unaudited, in thousands)		Amortized		Gross			Gross			Estimated		Amortized			Gross		Gross			Estimated
			Cost		Unrealized			Unrealized			Fair Value		Cost			Unrealized		Unrealized			Fair Value
					Gains			Losses								Gains		Losses
	Available-for-sale
	Obligations of government agencies		$	79,164	$	382		$	(644	)	$	78,902	$	75,164		$	6	$	(1,938	)	$	73,232
	Residential mortgage-backed securities and collateralized mortgage obligations of government agencies			772,918		4,114			(9,550	)		767,482		707,000			3,191		(15,924	)		694,267
	Obligations of states and political subdivisions			104,553		5,700			(14	)		110,239		112,536			4,165		(355	)		116,346
	Corporate debt securities			36,731		260			(99	)		36,892		38,777			174		(470	)		38,481
	Total debt securities		$	993,366	$	10,456		$	(10,307	)	$	993,515	$	933,477		$	7,536	$	(18,687	)	$	922,326
	Equity securities			11,270		1,294			—			12,564		10,597			1,463		—			12,060
	Total available-for-sale securities		$	1,004,636	$	11,750		$	(10,307	)	$	1,006,079	$	944,074		$	8,999	$	(18,687	)	$	934,386
	Held-to-maturity
	Residential mortgage-backed securities and collateralized mortgage obligations of government agencies		$	88,897	$	3,705		$	(501	)	$	92,101	$	99,409		$	2,804	$	(1,023	)	$	101,190
	Obligations of states and political subdivisions			513,058		20,866			(3,206	)		530,718		496,396			10,158		(13,906	)		492,648
	Corporate debt securities			5,740		66			(85	)		5,721		2,715			—		(245	)		2,470
	Total held-to-maturity securities		$	607,695	$	24,637		$	(3,792	)	$	628,540	$	598,520		$	12,962	$	(15,174	)	$	596,308
	Total securities		$	1,612,331	$	36,387		$	(14,099	)	$	1,634,619	$	1,542,594		$	21,961	$	(33,861	)	$	1,530,694
	At June 30, 2014, and December 31, 2013, there were no holdings of any one issuer, other than the U.S. government and its agencies, in an amount greater than 10% of WesBanco’s shareholders’ equity.
	The following table presents the fair value of available-for-sale and held-to-maturity securities by contractual maturity at June 30, 2014. In some instances, the issuers may have the right to call or prepay obligations without penalty prior to the contractual maturity date.
			June 30, 2014
	(unaudited, in thousands)		One Year		One to			Five to			After		Mortgage-backed			Total
			or less		Five Years			Ten Years			Ten Years		and Equity
	Available-for-sale
	Obligations of government agencies		$	313	$	9,833		$	26,123		$	42,633	$	—		$	78,902
	Residential mortgage-backed securities and collateralized mortgage obligations of government agencies (1)			—		—			—			—		767,482			767,482
	Obligations of states and political subdivisions			7,072		43,257			21,615			38,295		—			110,239
	Corporate debt securities			4,018		15,939			12,044			4,891		—			36,892
	Equity securities (2)			—		—			—			—		12,564			12,564
	Total available-for-sale securities		$	11,403	$	69,029		$	59,782		$	85,819	$	780,046		$	1,006,079
	Held-to-maturity (3)
	Residential mortgage-backed securities and collateralized mortgage obligations of government agencies (1)		$	—	$	—		$	—		$	—	$	92,101		$	92,101
	Obligations of states and political subdivisions			4,743		12,390			178,977			334,608		—			530,718
	Corporate debt securities			—		—			5,721			—		—			5,721
	Total held-to-maturity securities		$	4,743	$	12,390		$	184,698		$	334,608	$	92,101		$	628,540
	Total securities		$	16,146	$	81,419		$	244,480		$	420,427	$	872,147		$	1,634,619
	(1)	Mortgage-backed and collateralized mortgage securities, which have prepayment provisions, are not assigned to maturity categories due to fluctuations in their prepayment speeds.
	-2	Equity securities, which have no stated maturity, are not assigned a maturity category.
	(3)	The held-to-maturity portfolio is carried at an amortized cost of $607.7 million.
	Securities with aggregate fair values of $707.5 million and $701.7 million at June 30, 2014 and December 31, 2013, respectively, were pledged as security for public and trust funds, and securities sold under agreements to repurchase. Proceeds from the sale of available-for-sale securities were $3.5 million and $9.3 million for the six months ended June 30, 2014 and 2013, respectively. Net unrealized gains (losses) on available-for-sale securities included in accumulated other comprehensive income net of tax, as of June 30, 2014 and December 31, 2013 were $0.9 million and ($6.1) million, respectively.
	The following tables provide information on unrealized losses on investment securities that have been in an unrealized loss position for less than twelve months and twelve months or more as of June 30, 2014 and December 31, 2013:
			June 30, 2014
			Less than 12 months								12 months or more							Total
			Fair		Unrealized			# of			Fair		Unrealized			# of		Fair			Unrealized			# of
	(unaudited, dollars in thousands)		Value		Losses			Securities			Value		Losses			Securities		Value			Losses			Securities
	Obligations of government agencies		$	18,919	$	(124	)		5		$	19,790	$	(520	)		5	$	38,709		$	(644	)		10
	Residential mortgage-backed securities and collateralized mortgage obligations of government agencies			191,506		(1,380	)		37			239,724		(8,671	)		42		431,230			(10,051	)		79
	Obligations of states and political subdivisions			20,790		(107	)		34			115,199		(3,113	)		177		135,989			(3,220	)		211
	Corporate debt securities			4,996		(4	)		1			4,525		(180	)		2		9,521			(184	)		3
	Total temporarily impaired securities		$	236,211	$	(1,615	)		77		$	379,238	$	(12,484	)		226	$	615,449		$	(14,099	)		303
			31-Dec-13
			Less than 12 months								12 months or more							Total
			Fair		Unrealized			# of			Fair		Unrealized			# of		Fair			Unrealized			# of
	(unaudited, dollars in thousands)		Value		Losses			Securities			Value		Losses			Securities		Value			Losses			Securities
	Obligations of government agencies		$	54,356	$	(1,911	)		15		$	5,083	$	(27	)		2	$	59,439		$	(1,938	)		17
	Residential mortgage-backed securities and collateralized mortgage obligations of government agencies			513,495		(14,639	)		89			37,002		(2,308	)		11		550,497			(16,947	)		100
	Obligations of states and political subdivisions			181,667		(10,830	)		277			47,793		(3,431	)		76		229,460			(14,261	)		353
	Corporate debt securities			19,837		(560	)		7			2,845		(155	)		1		22,682			(715	)		8
	Total temporarily impaired securities		$	769,355	$	(27,940	)		388		$	92,723	$	(5,921	)		90	$	862,078		$	(33,861	)		478
	Unrealized losses on debt securities in the tables represent temporary fluctuations resulting from changes in market rates in relation to fixed yields. Unrealized losses in the available-for-sale portfolio are accounted for as an adjustment to other comprehensive income in shareholders’ equity.
	WesBanco does not believe the securities presented above are impaired due to reasons of credit quality, as there are no debt securities rated below investment grade and all are paying principal and interest according to their contractual terms. WesBanco does not intend to sell, nor is it more likely than not that it will be required to sell, loss position securities prior to recovery of their cost, and therefore, management believes the unrealized losses detailed above are temporary and no impairment loss relating to these securities has been recognized.
Securities that do not have readily determinable fair values and for which WesBanco does not exercise significant influence are carried at cost. Cost method investments consist primarily of Federal Home Loan Bank (“FHLB”) Pittsburgh and FHLB Cincinnati stock totaling $15.0 million and $11.6 million at June 30, 2014 and December 31, 2013, respectively, and are included in other assets in the Consolidated Balance Sheets. Cost method investments are evaluated for impairment whenever events or circumstances suggest that their carrying value may not be recoverable.

Loans_and_the_Allowance_for_Cr

Loans and the Allowance for Credit Losses	6 Months Ended
	Jun. 30, 2014
Receivables [Abstract]	'
Loans and the Allowance for Credit Losses	'
	NOTE 4. LOANS AND THE ALLOWANCE FOR CREDIT LOSSES
	The recorded investment in loans is presented in the Consolidated Balance Sheets net of deferred loan fees and costs of $2.8 million and $2.7 million at June 30, 2014 and December 31, 2013, respectively.
			June 30,			December 31,
	(unaudited, in thousands)		2014			2013
	Commercial real estate:
	Land and construction		$	255,499		$	263,117
	Improved property			1,685,373			1,649,802
	Total commercial real estate			1,940,872			1,912,919
	Commercial and industrial			578,665			556,249
	Residential real estate			898,357			890,804
	Home equity			295,127			284,687
	Consumer			233,097			250,258
	Total portfolio loans			3,946,118			3,894,917
	Loans held for sale			10,641			5,855
	Total loans		$	3,956,759		$	3,900,772
	The following tables summarize changes in the allowance for credit losses applicable to each category of the loan portfolio:
			Allowance for Credit Losses By Category
			For the Six Months Ended June 30, 2014 and 2013
	(unaudited, in thousands)		Commercial			Commercial			Commercial			Residential			Home			Consumer			Deposit			Total
			Real Estate -			Real Estate -			& Industrial			Real Estate			Equity						Overdraft
			Land and			Improved
			Construction			Property
	Balance at December 31, 2013:
	Allowance for loan losses		$	6,056		$	18,157		$	9,925		$	5,673		$	2,017		$	5,020		$	520		$	47,368
	Allowance for loan commitments			301			62			130			5			85			19			—			602
	Total beginning allowance for credit losses			6,357			18,219			10,055			5,678			2,102			5,039			520			47,970
	Provision for credit losses:
	Provision for loan losses			(405	)		(511	)		1,870			575			392			642			551			3,114
	Provision for loan commitments			(20	)		(52	)		1			—			5			—			—			(66	)
	Total provision for credit losses			(425	)		(563	)		1,871			575			397			642			551			3,048
	Charge-offs			—			(728	)		(2,384	)		(1,207	)		(348	)		(1,610	)		(362	)		(6,639	)
	Recoveries			—			390			543			248			71			512			134			1,898
	Net charge-offs			—			(338	)		(1,841	)		(959	)		(277	)		(1,098	)		(228	)		(4,741	)
	Balance at June 30, 2014:
	Allowance for loan losses			5,651			17,308			9,954			5,289			2,132			4,564			843			45,741
	Allowance for loan commitments			281			10			131			5			90			19			—			536
	Total ending allowance for credit losses		$	5,932		$	17,318		$	10,085		$	5,294		$	2,222		$	4,583		$	843		$	46,277
	Balance at December 31, 2012:
	Allowance for loan losses		$	3,741		$	23,614		$	9,326		$	7,182		$	2,458		$	5,557		$	821		$	52,699
	Allowance for loan commitments			27			25			215			6			49			19			—			341
	Total beginning allowance for credit losses			3,768			23,639			9,541			7,188			2,507			5,576			821			53,040
	Provision for credit losses:
	Provision for loan losses			559			1,855			(208	)		87			(32	)		836			50			3,147
	Provision for loan commitments			11			(2	)		(77	)		—			44			—			—			(24	)
	Total provision for credit losses			570			1,853			(285	)		87			12			836			50			3,123
	Charge-offs			(373	)		(1,395	)		(919	)		(1,573	)		(346	)		(2,043	)		(414	)		(7,063	)
	Recoveries			10			420			273			113			43			607			132			1,598
	Net charge-offs			(363	)		(975	)		(646	)		(1,460	)		(303	)		(1,436	)		(282	)		(5,465	)
	Balance at June 30, 2013:
	Allowance for loan losses			3,937			24,494			8,472			5,809			2,123			4,957			589			50,381
	Allowance for loan commitments			38			23			138			6			93			19			—			317
	Total ending allowance for credit losses		$	3,975		$	24,517		$	8,610		$	5,815		$	2,216		$	4,976		$	589		$	50,698
	The following tables present the allowance for credit losses and recorded investment in loans by category:
			Allowance for Credit Losses and Recorded Investment in Loans
	(unaudited, in thousands)		Commercial			Commercial			Commercial			Residential			Home			Consumer			Over-draft			Total
			Real Estate-			Real Estate-			and Industrial			Real Estate			Equity
			Land and			Improved
			Construction			Property
	June 30, 2014
	Allowance for credit losses:
	Allowance for loans individually evaluated for impairment		$	—		$	39		$	1,029		$	—		$	—		$	—		$	—		$	1,068
	Allowance for loans collectively evaluated for impairment			5,651			17,269			8,925			5,289			2,132			4,564			843			44,673
	Allowance for loan commitments			281			10			131			5			90			19			—			536
Total allowance for credit losses		$	5,932		$	17,318		$	10,085		$	5,294		$	2,222		$	4,583		$	843		$	46,277
Portfolio loans:
Individually evaluated for impairment (1)		$	—		$	4,264		$	3,084		$	—		$	—		$	—		$	—		$	7,348
Collectively evaluated for impairment			255,499			1,681,109			575,581			898,357			295,127			233,097			—			3,938,770
Total portfolio loans		$	255,499		$	1,685,373		$	578,665		$	898,357		$	295,127		$	233,097		$	—		$	3,946,118
December 31, 2013
Allowance for credit losses:
Allowance for loans individually evaluated for impairment		$	—		$	51		$	681		$	—		$	—		$	—		$	—		$	732
Allowance for loans collectively evaluated for impairment			6,056			18,106			9,244			5,673			2,017			5,020			520			46,636
Allowance for loan commitments			301			62			130			5			85			19			—			602
Total allowance for credit losses		$	6,357		$	18,219		$	10,055		$	5,678		$	2,102		$	5,039		$	520		$	47,970
Portfolio loans:
Individually evaluated for impairment (1)		$	—		$	4,321		$	1,754		$	—		$	—		$	—		$	—		$	6,075
Collectively evaluated for impairment			263,117			1,645,481			554,495			890,804			284,687			250,258			—			3,888,842
Total portfolio loans		$	263,117		$	1,649,802		$	556,249		$	890,804		$	284,687		$	250,258		$	—		$	3,894,917
(1)	Commercial loans greater than $1 million that are reported as non-accrual or as a troubled debt restructuring (“TDR”) are individually evaluated for impairment.
WesBanco maintains an internal loan grading system to reflect the credit quality of commercial loans. Commercial loan risk grades are determined based on an evaluation of the relevant characteristics of each loan, assigned at the inception of each loan and adjusted thereafter at any time to reflect changes in the risk profile throughout the life of each loan. The primary factors used to determine the risk grade are the reliability and sustainability of the primary source of repayment and overall financial strength of the borrower. This includes an analysis of cash flow available to repay debt, profitability, liquidity, leverage, and overall financial trends. Other factors include management, industry or property type risks, an assessment of secondary sources of repayment such as collateral or guarantees, other terms and conditions of the loan that may increase or reduce its risk, and economic conditions and other external factors that may influence repayment capacity and financial condition.
Commercial real estate — land and construction consists of loans to finance investments in vacant land, land development, construction of residential housing, and construction of commercial buildings. Commercial real estate – improved property consists of loans for the purchase or refinance of all types of improved owner-occupied and investment properties. Factors that are considered in assigning the risk grade vary depending on the type of property financed. The risk grade assigned to construction and development loans is based on the overall viability of the project, the experience and financial capacity of the developer or builder to successfully complete the project, project specific and market absorption rates and comparable property values, and the amount of pre-sales for residential housing construction or pre-leases for commercial investment property. The risk grade assigned to commercial investment property loans is based primarily on the adequacy of net rental income generated by the property to service the debt, the type, quality, industry and mix of tenants, and the terms of leases, but also considers the overall financial capacity of the investors and their experience in owning and managing investment property. The risk grade assigned to owner-occupied commercial real estate and commercial and industrial loans is based primarily on historical and projected earnings, the adequacy of operating cash flow to service all of the business’ debt, and the capital resources, liquidity and leverage of the business, but also considers the industry in which the business operates, the business’ specific competitive advantages or disadvantages, the quality and experience of management, and external influences on the business such as economic conditions. Other factors that are considered for commercial and industrial loans include the type, quality and marketability of non-real estate collateral and whether the structure of the loan increases or reduces its risk. The type, age, condition, location and any environmental risks associated with a property are also considered for all types of commercial real estate. The overall financial condition and repayment capacity of any guarantors is also evaluated to determine the extent to which they mitigate other risks of the loan. The following descriptions of risk grades apply to commercial real estate and commercial and industrial loans:
Excellent or minimal risk loans are fully secured by liquid or readily marketable collateral and therefore have virtually no risk of loss. Good or desirable risk loans are extended in the normal course of business to creditworthy borrowers that exhibit a history of positive financial results that are at least comparable to the average for their industry or type of real estate. These loans are expected to perform satisfactorily during most economic cycles and there are no significant external factors that are expected to adversely affect these borrowers more than others in the same industry. Any minor unfavorable characteristics of these loans are outweighed or mitigated by strong positive factors including but not limited to adequate secondary sources of repayment or guarantees.
Fair or acceptable risk loans have a somewhat higher credit risk profile due to specific weaknesses or uncertainties that could adversely impact repayment capacity. Loans in this category generally warrant additional attention or monitoring, or a more rigid loan structure. These loans represent the maximum level of risk accepted in the normal course of lending. Specific issues that may warrant this grade include financial results that are less favorable than the average for the borrower’s industry or type of real estate, cyclical financial results, loans based on projections that have a reasonable probability of being achieved, start-up businesses, construction projects, and other external factors that indicate a higher level of credit risk. Loans that are underwritten primarily on the basis of the repayment capacity or financial condition of guarantors may also be assigned this grade.
Criticized or marginal loans are currently protected but have weaknesses, which, if not corrected, may inadequately protect WesBanco Bank, Inc. (the “Bank”) at some future date. These loans represent an unwarranted credit risk and would generally not be extended in the normal course of lending. Specific issues which may warrant this grade include declining financial results, increased reliance on secondary sources of repayment or guarantor support and adverse external influences that may negatively impact the business or property.
Substandard and doubtful loans are equivalent to the classifications used by banking regulators. Substandard loans are inadequately protected by the current repayment capacity and equity of the borrower or collateral pledged, if any. Substandard loans have one or more well-defined weaknesses that jeopardize their repayment or collection in full. These loans may or may not be reported as non-accrual. Doubtful loans have all the weaknesses inherent to a substandard loan with the added characteristic that full repayment is highly questionable or improbable on the basis of currently existing facts, conditions and collateral values. However, recognition of loss may be deferred if there are reasonably specific pending factors that will reduce the risk if they occur.
The following tables summarize commercial loans by their assigned risk grade:
		Commerical Loans by Internally Assigned Risk Grade
(unaudited, in thousands)		Commercial			Commercial			Commercial			Total
		Real Estate-			Real Estate-			& Industrial			Commercial
		Land and			Improved						Loans
		Construction			Property
As of June 30, 2014
Excellent - minimal risk		$	—		$	352		$	72,161		$	72,513
Good - desirable risk			23,884			707,407			201,844			933,135
Fair - acceptable risk			222,915			885,735			283,772			1,392,422
Criticized - marginal			6,282			50,934			11,491			68,707
Classified - substandard			2,418			40,945			9,397			52,760
Classified - doubtful			—			—			—			—
Total		$	255,499		$	1,685,373		$	578,665		$	2,519,537
As of December 31, 2013
Excellent - minimal risk		$	—		$	360		$	73,389		$	73,749
Good - desirable risk			39,409			710,137			197,269			946,815
Fair - acceptable risk			213,822			838,283			260,915			1,313,020
Criticized - marginal			6,498			57,983			10,768			75,249
Classified - substandard			3,388			43,039			13,908			60,335
Classified - doubtful			—			—			—			—
Total		$	263,117		$	1,649,802		$	556,249		$	2,469,168
Residential real estate, home equity and consumer loans are not assigned internal risk grades other than as required by regulatory guidelines that are based primarily on the age of past due loans. WesBanco primarily evaluates the credit quality of residential real estate, home equity and consumer loans based on repayment performance and historical loss rates. The aggregate amount of residential real estate, home equity and consumer loans classified as substandard in accordance with regulatory guidelines were $14.7 million at June 30, 2014 and $14.4 million at December 31, 2013, of which $2.7 and $2.0 million were accruing, for each period, respectively. The aggregate amount of residential real estate, home equity and consumer loans classified as substandard are not included in the tables above.
The following tables summarize the age analysis of all categories of loans:
		Age Analysis of Loans
(unaudited, in thousands)		Current			30-59			60-89			90 Days			Total			Total Loans			90 Days or
					Days			Days			or More			Past Due						More
					Past Due			Past Due			Past Due									Past Due and
																				Accruing (1)
As of June 30, 2014
Commercial real estate:
Land and construction		$	253,610		$	290		$	1		$	1,598		$	1,889		$	255,499		$	248
Improved property			1,669,880			456			967			14,070			15,493			1,685,373			—
Total commercial real estate			1,923,490			746			968			15,668			17,382			1,940,872			248
Commercial and industrial			574,121			1,594			229			2,721			4,544			578,665			6
Residential real estate			884,456			1,554			2,692			9,655			13,901			898,357			1,843
Home equity			291,075			2,004			666			1,382			4,052			295,127			628
Consumer			229,714			2,492			529			362			3,383			233,097			222
Total portfolio loans			3,902,856			8,390			5,084			29,788			43,262			3,946,118			2,947
Loans held for sale			10,641			—			—			—			—			10,641			—
Total loans		$	3,913,497		$	8,390		$	5,084		$	29,788		$	43,262		$	3,956,759		$	2,947
Impaired loans included above are as follows:
Non-accrual loans		$	6,636		$	1,694		$	1,060		$	26,728		$	29,482		$	36,118
TDRs accruing interest (1)			12,818			167			415			113			695			13,513
Total impaired		$	19,454		$	1,861		$	1,475		$	26,841		$	30,177		$	49,631
As of December 31, 2013
Commercial real estate:
Land and construction		$	261,165		$	2		$	—		$	1,950		$	1,952		$	263,117		$	248
Improved property			1,632,973			2,482			2,346			12,001			16,829			1,649,802			318
Total commercial real estate			1,894,138			2,484			2,346			13,951			18,781			1,912,919			566
Commercial and industrial			552,414			1,112			977			1,746			3,835			556,249			—
Residential real estate			875,192			1,641			4,710			9,261			15,612			890,804			1,289
Home equity			281,004			1,581			470			1,632			3,683			284,687			411
Consumer			245,876			3,223			649			510			4,382			250,258			325
Total portfolio loans			3,848,624			10,041			9,152			27,100			46,293			3,894,917			2,591
Loans held for sale			5,855			—			—			—			—			5,855			—
Total loans		$	3,854,479		$	10,041		$	9,152		$	27,100		$	46,293		$	3,900,772		$	2,591
Impaired loans included above are as follows:
Non-accrual loans		$	9,028		$	588		$	2,722		$	24,295		$	27,605		$	36,633
TDRs accruing interest (1)			13,595			171			881			214			1,266			14,861
Total impaired		$	22,623		$	759		$	3,603		$	24,509		$	28,871		$	51,494
-1	Loans 90 days or more past due and accruing interest exclude TDRs 90 days or more past due and accruing interest.
Impaired Loans — A loan is considered impaired, based on current information and events, if it is probable that WesBanco will be unable to collect the payments of principal and interest when due according to the contractual terms of the loan agreement. Impaired loans generally included all non-accrual loans and TDRs.
Loans are generally placed on non-accrual when they are 90 days past due unless the loan is well-secured and in the process of collection. Loans may also be placed on non-accrual when full collection of principal is in doubt even if payments on such loans remain current, or may remain on non-accrual if they were past due but subsequently brought current.
Loans are categorized as TDRs when the Bank, for economic or legal reasons related to a borrower’s financial difficulties, grants a concession to the borrower that it would not otherwise consider.
The following tables summarize impaired loans:
		Impaired Loans
		June 30, 2014									December 31, 2013
(unaudited, in thousands)		Unpaid			Recorded			Related			Unpaid			Recorded			Related
		Principal			Investment			Allowance			Principal			Investment			Allowance
		Balance (1)									Balance (1)
With no related specific allowance recorded:
Commercial real estate:
Land and construction		$	2,050		$	1,950		$	—		$	2,663		$	2,564		$	—
Improved property			19,719			18,455			—			21,421			19,628			—
Commercial and industrial			4,970			4,428			—			3,773			3,249			—
Residential real estate			20,726			18,891			—			22,006			20,090			—
Home equity			2,355			2,118			—			2,675			2,506			—
Consumer			1,317			1,103			—			1,402			1,182			—
Total impaired loans without a specific allowance			51,137			46,945			—			53,940			49,219			—
With a specific allowance recorded:
Commercial real estate:
Improved property			725			725			39			729			729			51
Commercial and industrial			1,961			1,961			1,029			1,546			1,546			681
Total impaired loans with a specific allowance			2,686			2,686			1,068			2,275			2,275			732
Total impaired loans		$	53,823		$	49,631		$	1,068		$	56,215		$	51,494		$	732
-1	The difference between the unpaid principal balance and the recorded investment generally reflects amounts that have been previously charged-off.
		Impaired Loans
		For the Three Months Ended												For the Six Months Ended
		June 30, 2014						June 30, 2013						June 30, 2014						June 30, 2013
(unaudited, in thousands)		Average			Interest			Average			Interest			Average			Interest			Average			Interest
		Recorded			Income			Recorded			Income			Recorded			Income			Recorded			Income
		Investment			Recognized			Investment			Recognized			Investment			Recognized			Investment			Recognized
With no related specific allowance recorded:
Commercial real estate:
Land and construction		$	2,143		$	13		$	5,704		$	37		$	2,283		$	15		$	5,661		$	97
Improved Property			18,572			133			24,428			185			18,924			153			24,437			316
Commercial and industrial			4,122			57			3,974			28			3,831			89			3,989			61
Residential real estate			18,864			209			19,462			171			19,272			391			19,731			365
Home equity			2,173			16			2,034			15			2,284			35			2,092			30
Consumer			1,135			18			1,433			22			1,150			46			1,461			49
Total impaired loans without a specific allowance			47,009			446			57,035			458			47,744			729			57,371			918
With a specific allowance recorded:
Commercial real estate:
Land and construction			—			—			1,540			9			—			—			1,569			22
Improved Property			727			3			4,168			17			727			4			4,106			32
Commercial and industrial			2,537			29			—			—			2,206			41			—			—
Total impaired loans with a specific allowance			3,264			32			5,708			26			2,933			45			5,675			54
Total impaired loans		$	50,273		$	478		$	62,743		$	484		$	50,677		$	774		$	63,046		$	972
The following tables present the recorded investment in non-accrual loans and TDRs:
		Non-accrual Loans (1)
(unaudited, in thousands)		June 30,			December 31,
		2014			2013
Commercial real estate:
Land and construction		$	1,950		$	2,564
Improved property			15,946			17,305
Total commercial real estate			17,896			19,869
Commercial and industrial			6,167			4,380
Residential real estate			10,137			10,240
Home equity			1,283			1,604
Consumer			635			540
Total		$	36,118		$	36,633
(1)	Total non-accrual loans include loans that are also restructured. Such loans are also set forth in the following table as non-accrual TDRs.
		TDRs
		June 30, 2014									December 31, 2013
(unaudited, in thousands)		Accruing			Non-			Total			Accruing			Non-			Total
					Accrual									Accrual
Commercial real estate:
Land and construction		$	—		$	1,008		$	1,008		$	—		$	1,601		$	1,601
Improved property			3,234			1,944			5,178			3,052			3,658			6,710
Total commercial real estate			3,234			2,952			6,186			3,052			5,259			8,311
Commercial and industrial			222			403			625			415			579			994
Residential real estate			8,754			2,414			11,168			9,850			2,991			12,841
Home equity			835			217			1,052			902			289			1,191
Consumer			468			295			763			642			206			848
Total		$	13,513		$	6,281		$	19,794		$	14,861		$	9,324		$	24,185
As of June 30, 2014, there were no TDRs greater than $1.0 million. The concessions granted in the majority of loans reported as accruing and non-accrual TDRs are extensions of the maturity date or the amortization period, reductions in the interest rate below the prevailing market rate for loans with comparable characteristics, and/or permitting interest-only payments for longer than three months.
The following tables present details related to loans identified as TDRs during the three and six months ended June 30, 2014 and June 30, 2013, respectively:
		New TDRs (1)
		For the Three Months Ended
		June 30, 2014									June 30, 2013
(unaudited, dollars in thousands)		Number  of			Pre-			Post-			Number  of			Pre-			Post-
		Modifications			Modification			Modification			Modifications			Modification			Modification
					Outstanding			Outstanding						Outstanding			Outstanding
					Recorded			Recorded						Recorded			Recorded
					Investment			Investment						Investment			Investment
Commercial real estate:
Land and construction			—		$	—		$	—			—		$	—		$	—
Improved Property			1			112			112			3			120			120
Total commercial real estate			1			112			112			3			120			120
Commercial and industrial			—			—			—			—			—			—
Residential real estate			2			70			70			9			673			672
Home equity			—			—			—			1			13			13
Consumer			9			100			93			3			36			35
Total			12		$	282		$	275			16		$	842		$	840
(1)	Excludes loans that were either paid off or charged-off by period end. The pre-modification balance represents the balance outstanding at the beginning of the period. The post-modification balance represents the outstanding balance at period end.
		New TDRs (1)
		For the Six Months Ended
		June 30, 2014									June 30, 2013
(unaudited, dollars in thousands)		Number of			Pre-			Post-			Number  of			Pre-			Post-
		Modifications			Modification			Modification			Modifications			Modification			Modification
					Outstanding			Outstanding						Outstanding			Outstanding
					Recorded			Recorded						Recorded			Recorded
					Investment			Investment						Investment			Investment
Commercial real estate:
Land and construction			—		$	—		$	—			1		$	299		$	295
Improved Property			2			203			201			8			1,011			836
Total commercial real estate			2			203			201			9			1,310			1,131
Commercial and industrial			—			—			—			6			161			161
Residential real estate			5			189			185			16			1,883			1,819
Home equity			—			—			—			1			14			13
Consumer			11			138			123			8			73			67
Total			18		$	530		$	509			40		$	3,441		$	3,191
(1)	Excludes loans that were either paid off or charged-off by period end. The pre-modification balance represents the balance outstanding at the beginning of the period. The post-modification balance represents the outstanding balance at period end.
The following tables summarize TDRs which defaulted (defined as past due 90 days or more) during the three and six months ended June 30, 2014 and 2013 that were restructured within the last twelve months prior to June 30, 2014 and 2013:
		Defaulted TDRs (1)
		For the Three Months Ended
		June 30, 2014						June 30, 2013
(unaudited, dollars in thousands)		Number of			Recorded			Number of			Recorded
		Defaults			Investment			Defaults			Investment
Commercial real estate:
Land and construction			—		$	—			—		$	—
Improved property			—			—			—			—
Total commercial real estate			—			—			—			—
Commercial and industrial			—			—			—			—
Residential real estate			—			—			5			312
Home equity			—			—			1			21
Consumer			—			—			—			—
Total			—		$	—			6		$	333
(1)	Excludes loans that were either charged-off or cured by period end. The recorded investment is as of June 30, 2014 and 2013.
		Defaulted TDRs (1)
		For the Six Months Ended
		June 30, 2014						June 30, 2013
(unaudited, dollars in thousands)		Number of			Recorded			Number of			Recorded
		Defaults			Investment			Defaults			Investment
Commercial real estate:
Land and construction			—		$	—			—		$	—
Improved property			—			—			2			645
Total commercial real estate			—			—			2			645
Commercial and industrial			—			—			3			313
Residential real estate			4			236			19			1,634
Home equity			—			—			6			124
Consumer			—			—			1			32
Total			4		$	236			31		$	2,748
(1)	Excludes loans that were either charged-off or cured by period end. The recorded investment is as of June 30, 2014 and 2013.
TDRs that defaulted during the six month period that were restructured within the last twelve months represented 1.2% of the total TDR balance at June 30, 2014. These loans are placed on non-accrual status unless they are both well-secured and in the process of collection. At June 30, 2014, none of the loans in the table above were accruing interest.
The following table summarizes other real estate owned and repossessed assets included in other assets:
(unaudited, in thousands)		June 30,			December 31,
		2014			2013
Other real estate owned		$	4,923		$	4,689
Repossessed assets			183			171
Total other real estate owned and repossessed assets		$	5,106		$	4,860

Pension_Plan

Pension Plan	6 Months Ended
	Jun. 30, 2014
Compensation And Retirement Disclosure [Abstract]	'
Pension Plan	'
	NOTE 5. PENSION PLAN
	The following table presents the net periodic pension cost for WesBanco’s Defined Benefit Pension Plan (the “Plan”) and the related components:
		For the Three Months Ended						For the Six Months  Ended
		June 30,						June 30,
	(unaudited, in thousands)	2014			2013			2014			2013
	Service cost - benefits earned during year	$	725		$	698		$	1,442		$	1,655
	Interest cost on projected benefit obligation		1,183			982			2,353			2,078
	Expected return on plan assets		(1,802	)		(1,437	)		(3,585	)		(3,040	)
	Amortization of prior service cost		11			11			22			23
	Amortization of net loss		367			897			730			1,720
	Net periodic pension cost	$	484		$	1,151		$	962		$	2,436
	The Plan covers all employees of WesBanco who were hired on or before August 1, 2007 who satisfy minimum age and length of service requirements, and is not available to employees hired after such date.
	A minimum required contribution of $5.3 million is due for 2014 which will be partially funded by the Plan’s $29.2 million available credit balance. A contribution of $2.5 million was made in June 2014 and an additional $2.5 million is expected to be funded in December.

Fair_Value_Measurement

Fair Value Measurement	6 Months Ended
	Jun. 30, 2014
Fair Value Disclosures [Abstract]	'
Fair Value Measurement	'
	NOTE 6. FAIR VALUE MEASUREMENT
	Fair value estimates are based on quoted market prices, if available, quoted market prices of similar assets or liabilities, or the present value of expected future cash flows and other valuation techniques. These valuations are significantly affected by discount rates, cash flow assumptions, and risk assumptions used. Therefore, fair value estimates may not be substantiated by comparison to independent markets and are not intended to reflect the proceeds that may be realizable in an immediate settlement of the instruments.
	Fair value is determined at one point in time and is not representative of future value. These amounts do not reflect the total value of a going concern organization. Management does not have the intention to dispose of a significant portion of its assets and liabilities and therefore, the unrealized gains or losses should not be interpreted as a forecast of future earnings and cash flows.
	The following is a discussion of assets and liabilities measured at fair value on a recurring basis and valuation techniques applied:
	Securities available-for-sale: The fair value of securities available-for-sale which are measured on a recurring basis are determined primarily by obtaining quoted prices on nationally recognized securities exchanges or matrix pricing, which is a mathematical technique used widely in the industry to value debt securities without relying exclusively on quoted prices for the specific securities but rather by relying on the securities’ relationship to other similar securities. These securities are classified within level 1 or 2 in the fair value hierarchy. Certain equity securities that are lightly traded in over-the-counter markets are classified as level 2 in the fair value hierarchy, as quoted market prices may not be available on the fair value measurement date. Positions that are not traded in active markets for which valuations are generated using assumptions not observable in the market or management’s best estimate are classified within level 3 of the fair value hierarchy. This includes certain specific municipal debt issues for which the credit quality and discount rate must be estimated.
	We may be required from time to time to measure certain assets at fair value on a nonrecurring basis in accordance with GAAP. These adjustments to fair value usually result from application of lower of cost or market accounting or write-downs of individual assets.
	Impaired loans: Impaired loans are carried at the lower of cost or the fair value of the collateral for collateral-dependent loans. Collateral may be in the form of real estate or business assets including equipment, inventory and accounts receivable. The use of independent appraisals, discounted cash flow models and management’s best judgment are significant inputs in arriving at the fair value measure of the underlying collateral and impaired loans are therefore classified within level 3 of the fair value hierarchy.
	Other real estate owned and repossessed assets: Other real estate owned and repossessed assets are carried at the lower of the investment in the assets or the fair value of the assets less estimated selling costs. The use of independent appraisals and management’s best judgment are significant inputs in arriving at the fair value measure of the underlying collateral, and therefore other real estate owned and repossessed assets are classified within level 3 of the fair value hierarchy.
	Loans held for sale: Loans held for sale are carried, in aggregate, at the lower of cost or fair value. The use of a valuation model using quoted prices of similar instruments are significant inputs in arriving at the fair value and therefore loans held for sale are classified within level 2 of the fair value hierarchy.
	The following tables set forth WesBanco’s financial assets and liabilities that were accounted for at fair value on a recurring and nonrecurring basis by level within the fair value hierarchy as of June 30, 2014 and December 31, 2013:
					June 30, 2014
					Fair Value Measurements Using:
	(unaudited, in thousands)		June 30,		Quoted Prices in			Significant  Other		Significant
			2014		Active  Markets			Observable		Unobservable
					for Identical			Inputs		Inputs
					Assets (level 1)			(level 2)		(level 3)
	Recurring fair value measurements
	Securities - available-for-sale
	Obligations of government agencies		$	78,902	$	—		$	78,902	$	—
	Residential mortgage-backed securities and collateralized mortgage obligations of government agencies			767,482		—			767,482		—
	Obligations of state and political subdivisions			110,239		—			110,239		—
	Corporate debt securities			36,892		—			36,892		—
	Equity securities			12,564		10,558			2,006		—
	Total securities - available-for-sale		$	1,006,079	$	10,558		$	995,521	$	—
	Total recurring fair value measurements		$	1,006,079	$	10,558		$	995,521	$	—
	Nonrecurring fair value measurements
	Impaired loans		$	1,618	$	—		$	—	$	1,618
	Other real estate owned and repossessed assets			5,106		—			—		5,106
	Loans held for sale			10,641		—			10,641		—
	Total nonrecurring fair value measurements		$	17,365	$	—		$	10,641	$	6,724
					December 31, 2013
					Fair Value Measurements Using:
	(unaudited, in thousands)		December 31,		Quoted Prices in			Significant  Other		Significant
			2013		Active  Markets			Observable		Unobservable
					for Identical			Inputs		Inputs
					Assets (level 1)			(level 2)		(level 3)
	Recurring fair value measurements
	Securities - available-for-sale
	Obligations of government agencies		$	73,232	$	—		$	73,232	$	—
	Residential mortgage-backed securities and collateralized mortgage obligations of government agencies			694,267		—			694,267		—
	Obligations of state and political subdivisions			116,346		—			116,346		—
	Corporate debt securities			38,481		—			38,481		—
	Equity securities			12,060		9,962			2,098		—
	Total securities - available-for-sale		$	934,386	$	9,962		$	924,424	$	—
	Total recurring fair value measurements		$	934,386	$	9,962		$	924,424	$	—
	Nonrecurring fair value measurements
	Impaired loans		$	1,543	$	—		$	—	$	1,543
	Other real estate owned and repossessed assets			4,860		—			—		4,860
	Loans held for sale			5,855		—			5,855		—
	Total nonrecurring fair value measurements		$	12,258	$	—		$	5,855	$	6,403
	WesBanco’s policy is to recognize transfers between levels as of the actual date of the event or change in circumstances that caused the transfer. There were no transfers between level 1, 2 or 3 for the six months ended June 30, 2014 or 2013.
	The following table presents additional quantitative information about assets measured at fair value on a nonrecurring basis and for which WesBanco has utilized level 3 inputs to determine fair value:
			Quantitative Information about Level 3 Fair Value Measurements
	(unaudited, in thousands)		Fair Value		Valuation Techniques		Unobservable Input	Range / Weighted Average
			Estimate
	30-Jun-14
	Impaired loans		$	1,618	Appraisal of collateral (1)		Appraisal adjustments (2)	0% to (36.1%) / (22.7%)
							Liquidation expenses (2)	(1.0%) to (8.0%) / (3.7%)
	Other real estate owned and repossessed assets			5,106	Appraisal of collateral (1), (3)
	December 31, 2013:
	Impaired loans		$	1,543	Appraisal of collateral (1)		Appraisal adjustments (2)	0% to (29.1%) / (15.6%)
							Liquidation expenses (2)	(3.5%) to (8.0%) / (4.7%)
	Other real estate owned and repossessed assets			4,860	Appraisal of collateral (1), (3)
-1	Fair value is generally determined through independent appraisals of the underlying collateral, which generally include various level 3 inputs which are not identifiable.
(2)	Appraisals may be adjusted by management for qualitative factors such as economic conditions and estimated liquidation expenses. The range and weighted average of appraisal adjustments and liquidation expenses are presented as a percent of the appraisal.
(3)	Includes estimated liquidation expenses and numerous dissimilar qualitative adjustments by management which are not identifiable.
The estimated fair values of WesBanco’s financial instruments are summarized below:
							Fair Value Measurements
(unaudited in thousands)		Carrying		Fair Value			Quoted Prices in		Significant  Other		Significant
		Amount		Estimate			Active  Markets		Observable		Unobservable
							for Identical		Inputs		Inputs
							Assets (level 1)		(level 2)		(level 3)
June 30, 2014
Financial Assets
Cash and due from banks		$	94,488	$	94,488		$	94,488	$	—	$	—
Securities available-for-sale			1,006,079		1,006,079			10,558		995,521		—
Securities held-to-maturity			607,695		628,540			—		627,805		735
Net loans			3,900,377		3,784,772			—		—		3,784,772
Loans held for sale			10,641		10,641			—		10,641		—
Accrued interest receivable			19,087		19,087			19,087		—		—
Bank-owned life insurance			121,878		121,878			121,878		—		—
Financial Liabilities
Deposits			5,117,403		5,127,522			3,691,573		1,435,949		—
Federal Home Loan Bank borrowings			138,596		141,126			—		141,126		—
Other borrowings			94,745		96,661			68,475		28,186		—
Junior subordinated debt			106,156		77,075			—		77,075		—
Accrued interest payable			2,306		2,306			2,306		—		—
December 31, 2013:
Financial Assets
Cash and due from banks		$	95,551	$	95,551		$	95,551	$	—	$	—
Securities available-for-sale			934,386		934,386			9,962		924,424		—
Securities held-to-maturity			598,520		596,308			—		595,581		727
Net loans			3,847,549		3,754,465			—		—		3,754,465
Loans held for sale			5,855		5,855			—		5,855		—
Accrued interest receivable			18,960		18,960			18,960		—		—
Bank-owned life insurance			121,390		121,390			121,390		—		—
Financial Liabilities
Deposits			5,062,530		5,076,207			3,551,052		1,525,155		—
Federal Home Loan Bank borrowings			39,508		42,314			—		42,314		—
Other borrowings			150,536		153,015			104,196		48,819		—
Junior subordinated debt			106,137		74,038			—		74,038		—
Accrued interest payable			2,354		2,354			2,354		—		—
The following methods and assumptions were used to measure the fair value of financial instruments recorded at cost on WesBanco’s Consolidated Balance Sheets:
Cash and due from banks: The carrying amount for cash and due from banks is a reasonable estimate of fair value.
Securities held-to-maturity: Fair values for securities held-to-maturity are determined in the same manner as securities available-for-sale which is described above.
Net loans: Fair values for loans are estimated using a discounted cash flow methodology. The discount rates take into account interest rates currently being offered to customers for loans with similar terms, the credit risk associated with the loan and other market factors, including liquidity. The valuation of the loan portfolio reflects discounts that WesBanco believes are consistent with transactions occurring in the marketplace for both performing and distressed loan types. The carrying value that fair value is compared to is net of the allowance for loan losses and other associated premiums and discounts. Due to the significant judgment involved in evaluating credit quality, loans are classified within level 3 of the fair value hierarchy.
Accrued interest receivable: The carrying amount of accrued interest receivable approximates its fair value.
Bank-owned life insurance: The carrying value of bank-owned life insurance represents the net cash surrender value of the underlying insurance policies, should these policies be terminated. Management believes that the carrying value approximates its fair value.
Deposits: The carrying amount is considered a reasonable estimate of fair value for demand, savings and other variable rate deposit accounts. The fair value of fixed maturity certificates of deposit is estimated by a discounted cash flow method using rates currently offered for deposits of similar remaining maturities.
Federal Home Loan Bank borrowings: The fair value of FHLB borrowings is based on rates currently available to WesBanco for borrowings with similar terms and remaining maturities.
Other borrowings: The carrying amount of federal funds purchased and overnight sweep accounts generally approximate fair value. Other repurchase agreements are based on quoted market prices if available. If market prices are not available, for certain fixed and adjustable rate repurchase agreements, then quoted market prices of similar instruments are used.
Junior subordinated debt owed to unconsolidated subsidiary trusts: Due to the pooled nature of these instruments, which are not actively traded, estimated fair value is based on recent similar transactions of single-issuer trust preferred securities.
Accrued interest payable: The carrying amount of accrued interest payable approximates its fair value.
Off-balance sheet financial instruments: Off-balance sheet financial instruments consist of commitments to extend credit including letters of credit. Fair values for commitments to extend credit are estimated using the fees currently charged to enter into similar agreements, taking into account the remaining terms of the agreements and the present credit standing of the counterparties. The estimated fair value of the commitments to extend credit and letters of credit are insignificant and therefore are not presented in the above tables.

Comprehensive_Income

Comprehensive Income	6 Months Ended
	Jun. 30, 2014
Equity [Abstract]	'
Comprehensive Income	'
	NOTE 7. COMPREHENSIVE INCOME
	The activity in accumulated other comprehensive income for the six months ended June 30, 2014 and 2013 is as follows:
			Accumulated Other Comprehensive Income(1)
	(unaudited, in thousands)		Defined			Unrealized Gains			Unrealized Gains			Total
			Benefit			(Losses) on			on Securities
			Pension			Securities			Transferred
			Plan			Available-for-Sale			from Available-
									for-Sale to
									Held-to-Maturity
	Balance at December 31, 2013		$	(7,966	)	$	(6,126	)	$	1,358		$	(12,734	)
	Other comprehensive income before reclassifications			—			7,194			—			7,194
	Amounts reclassified from accumulated other comprehensive income			475			(157	)	$	(171	)		147
	Period change			475			7,037		$	(171	)		7,341
	Balance at June 30, 2014		$	(7,491	)	$	911		$	1,187		$	(5,393	)
	Balance at December 31, 2012		$	(21,401	)	$	13,032		$	2,004		$	(6,365	)
	Other comprehensive income before reclassifications			—			(11,526	)		—			(11,526	)
	Amounts reclassified from accumulated other comprehensive income			1,050			(82	)		(406	)		562
	Period change			1,050			(11,608	)		(406	)		(10,964	)
	Balance at June 30, 2013		$	(20,351	)	$	1,424		$	1,598		$	(17,329	)
	(1)	All amounts are net of tax. Related income tax expense or benefit is calculated using a combined Federal and State income tax rate approximating 36.5%.
	The following table provides details about amounts reclassified from accumulated other comprehensive income for the three and six months ended June 30, 2014 and 2013:
	Details about Accumulated Other Comprehensive		For the Three Months Ended						For the Six Months  Ended						Affected Line Item in the
	Income Components		June 30,						June 30,						Statement of Net Income
	(unaudited, in thousands)		2014			2013			2014			2013
	Securities available-for-sale (1):
	Net securities gains reclassified into earnings		$	(170	)	$	(113	)	$	(248	)	$	(129	)	Net securities gains (Non-interest income)
	Related income tax expense			63			42			91			47		Provision for income taxes
	Net effect on accumulated other comprehensive income for the period			(107	)		(71	)		(157	)		(82	)
	Securities held-to-maturity (1):
	Amortization of unrealized gain transferred from available-for-sale			(132	)		(362	)		(270	)		(650	)	Interest and dividends on securities (Interest and dividend income)
	Related income tax expense			48			133			99			244		Provision for income taxes
	Net effect on accumulated other comprehensive income for the period			(84	)		(229	)		(171	)		(406	)
	Defined benefit pension plan (2):
	Amortization of net loss and prior service costs			378			909			752			1,743		Employee benefits (Non-interest expense)
	Related income tax expense			(139	)		(334	)		(277	)		(693	)	Provision for income taxes
	Net effect on accumulated other comprehensive income for the period			239			575			475			1,050
	Total reclassifications for the period		$	48		$	275			147		$	562
	(1)	For additional detail related to unrealized gains on securities and related amounts reclassified from accumulated other comprehensive income see Note 3, “Securities.”
	(2)	Included in the computation of net periodic pension cost. See Note 5, “Pension Plan” for additional detail.

Commitments_and_Contingent_Lia

Commitments and Contingent Liabilities	6 Months Ended
	Jun. 30, 2014
Commitments And Contingencies Disclosure [Abstract]	'
Commitments and Contingent Liabilities	'
	NOTE 8. COMMITMENTS AND CONTINGENT LIABILITIES
	Commitments — In the normal course of business, WesBanco offers off-balance sheet credit arrangements to enable its customers to meet their financing objectives. Those instruments involve, to varying degrees, elements of credit and interest rate risk in excess of the amount recognized in the financial statements. WesBanco’s exposure to credit losses in the event of non-performance by the other parties to the financial instruments for commitments to extend credit and standby letters of credit is limited to the contractual amount of those instruments. WesBanco uses the same credit policies in making commitments and conditional obligations as for all other lending. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. The allowance for credit losses associated with commitments was $0.5 million and $0.6 million as of June 30, 2014 and December 31, 2013, respectively, and is included in other liabilities on the Consolidated Balance Sheets.
	Letters of credit are conditional commitments issued by banks to guarantee the performance of a customer to a third party. Those guarantees are primarily issued to support public and private borrowing arrangements, including normal business activities, bond financing and similar transactions. Letters of credit are considered guarantees. The liability associated with letters of credit was immaterial as of June 30, 2014 and December 31, 2013.
	Contingent obligations to purchase loans funded by other entities include affordable housing plan guarantees and credit card guarantees. Affordable housing plan guarantees are performance guarantees for various building project loans. The guarantee amortizes as the loan balances decrease. Credit card guarantees are credit card balances not owned by WesBanco, whereby the Bank guarantees the performance of the cardholder.
	The following table presents total commitments to extend credit, guarantees and various letters of credit outstanding:
	(unaudited, in thousands)	June 30,		December 31,
		2014		2013
	Lines of credit	$	936,986	$	964,777
	Loans approved but not closed		132,542		73,937
	Overdraft limits		88,648		96,291
	Letters of credit		26,212		18,686
	Contingent obligations to purchase loans funded by other entities		6,313		6,327
	Contingent Liabilities — WesBanco is a party to various legal and administrative proceedings and claims. While any litigation contains an element of uncertainty, management does not believe that a material loss related to such proceedings or claims pending or known to be threatened is reasonably possible.

Business_Segments

Business Segments	6 Months Ended
	Jun. 30, 2014
Segment Reporting [Abstract]	'
Business Segments	'
	NOTE 9. BUSINESS SEGMENTS
	WesBanco operates two reportable segments: community banking as well as trust and investment services. WesBanco’s community banking segment offers services traditionally offered by full-service commercial banks, including commercial demand, individual demand and time deposit accounts, as well as commercial, mortgage and individual installment loans, and certain non-traditional offerings, such as insurance and securities brokerage services. The trust and investment services segment offers trust services as well as various mutual funds. The market value of assets managed or held in custody by the trust and investment services segment was approximately $3.8 billion and $3.4 billion at June 30, 2014 and 2013, respectively. These assets are held by WesBanco in fiduciary or agency capacities for their customers and therefore are not included as assets on WesBanco’s Consolidated Balance Sheets.
	Condensed financial information by business segment is presented below:
	(unaudited, in thousands)	Community		Trust and		Consolidated
		Banking		Investment
				Services
	For the Three Months ended June 30, 2014:
	Interest income	$	54,044	$	—	$	54,044
	Interest expense		5,737		—		5,737
	Net interest income		48,307		—		48,307
	Provision for credit losses		849		—		849
	Net interest income after provision for credit losses		47,458		—		47,458
	Non-interest income		13,031		5,210		18,241
	Non-interest expense		37,367		2,937		40,304
	Income before provision for income taxes		23,122		2,273		25,395
	Provision for income taxes		5,611		909		6,520
	Net income	$	17,511	$	1,364	$	18,875
	For the Three Months ended June 30, 2013:
	Interest income	$	54,424	$	—	$	54,424
	Interest expense		8,435		—		8,435
	Net interest income		45,989		—		45,989
	Provision for credit losses		1,021		—		1,021
	Net interest income after provision for credit losses		44,968		—		44,968
	Non-interest income		12,901		4,823		17,724
	Non-interest expense		36,620		2,879		39,499
	Income before provision for income taxes		21,249		1,944		23,193
	Provision for income taxes		5,399		777		6,176
	Net income	$	15,850	$	1,167	$	17,017
	For the Six Months ended June 30, 2014:
	Interest income	$	107,501	$	—	$	107,501
	Interest expense		11,870		—		11,870
	Net interest income		95,631		—		95,631
	Provision for credit losses		3,048		—		3,048
	Net interest income after provision for credit losses		92,583		—		92,583
	Non-interest income		24,432		10,858		35,290
	Non-interest expense		74,193		6,205		80,398
	Income before provision for income taxes		42,822		4,653		47,475
	Provision for income taxes		10,318		1,861		12,179
	Net income	$	32,504	$	2,792	$	35,296
	For the Six Months ended June 30, 2013:
	Interest income	$	109,317	$	—	$	109,317
	Interest expense		17,199		—		17,199
	Net interest income		92,118		—		92,118
	Provision for credit losses		3,123		—		3,123
	Net interest income after provision for credit losses		88,995		—		88,995
	Non-interest income		25,380		9,840		35,220
	Non-interest expense		74,372		5,874		80,246
	Income before provision for income taxes		40,003		3,966		43,969
	Provision for income taxes		9,346		1,586		10,932
	Net income	$	30,657	$	2,380	$	33,037
	Total non-fiduciary assets of the trust and investment services segment were $3.9 million and $3.1 million at June 30, 2014 and 2013, respectively. All goodwill and other intangible assets were allocated to the community banking segment.

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2014
Accounting Policies [Abstract]	'
Basis of presentation	'
	Basis of presentation — The accompanying unaudited interim financial statements of WesBanco, Inc. and its consolidated subsidiaries (“WesBanco”) have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) for interim financial information and the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements and should be read in conjunction with our Annual Report on Form 10-K for the year ended December 31, 2013.
	WesBanco’s interim financial statements have been prepared following the significant accounting policies disclosed in Note 1 of the Notes to the Consolidated Financial Statements of its 2013 Annual Report on Form 10-K filed with the Securities and Exchange Commission. In the opinion of management, the accompanying interim financial information reflects all adjustments, including normal recurring adjustments, necessary to present fairly WesBanco’s financial position and results of operations for each of the interim periods presented. Results of operations for interim periods are not necessarily indicative of the results of operations that may be expected for a full year.
Recent accounting pronouncements	'
	Recent accounting pronouncements — In June 2014, the Financial Accounting Standards Board (the “FASB”) issued an Accounting Standards Update (“ASU”) (ASU 2014-11) related to repurchase-to-maturity transactions, repurchase financing and disclosures. The pronouncement changes the accounting for repurchase-to-maturity transactions and linked repurchase financings to secured borrowing accounting, which is consistent with the accounting for other repurchase agreements. The pronouncement also requires two new disclosures. The first disclosure requires an entity to disclose information on transfers accounted for as sales in transactions that are economically similar to repurchase agreements. The second disclosure provides increased transparency about the types of collateral pledged in repurchase agreements and similar transactions accounted for as secured borrowings. The pronouncement is effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2014. Early adoption is not permitted. The adoption of this pronouncement is not expected to have a material impact on WesBanco’s Consolidated Financial Statements.
	In May 2014, the FASB issued an accounting pronouncement (ASU 2014-09) related to the recognition of revenue from contracts with customers. The new revenue pronouncement creates a single source of revenue guidance for all companies in all industries and is more principles-based than current revenue guidance. The pronouncement provides a five-step model for a company to recognize revenue when it transfers control of goods or services to customers at an amount that reflects the consideration to which it expects to be entitled in exchange for those goods or services. The five steps are (1) identify the contract with the customer, (2) identify the separate performance obligations in the contract, (3) determine the transaction price, (4) allocate the transaction price to the separate performance obligations and (5) recognize revenue when each performance obligation is satisfied. The pronouncement is effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2016 using either a full retrospective approach for all periods presented in the period of adoption or a modified retrospective approach. Early adoption is not permitted. WesBanco is currently evaluating the impact of the adoption of this pronouncement on its Consolidated Financial Statements.
	In January 2014, the FASB issued an accounting pronouncement (ASU 2014-04) related to in-substance repossessions and foreclosures. The pronouncement clarifies when an in-substance repossession or foreclosure occurs. A creditor is considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan, upon either (1) the creditor obtaining legal title to the residential real estate property upon completion of a foreclosure or (2) the borrower conveying all interest in the residential real estate property to the creditor to satisfy that loan through completion of a deed in lieu of foreclosure or through a similar legal agreement. Additionally, the amendments require interim and annual disclosure of both (1) the amount of foreclosed residential real estate property held by the creditor and (2) the recorded investment in consumer mortgage loans collateralized by residential real estate property that are in the process of foreclosure according to local requirements of the applicable jurisdiction. The pronouncement is effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2014 and may be adopted under either a modified retrospective transition method or a prospective transition method. Early adoption is permitted. The adoption of this pronouncement is not expected to have a material impact on WesBanco’s Consolidated Financial Statements.
	In January 2014, the FASB issued an accounting pronouncement (ASU 2014-01) which applies to all reporting entities that invest in qualified affordable housing projects through limited liability entities. The pronouncement permits reporting entities to make an accounting policy election to account for these investments using the proportional amortization method if certain conditions exist. The pronouncement also requires disclosure that enables users of its financial statements to understand the nature of these investments. Under the proportional amortization method, an entity amortizes the initial cost of the investment in proportion to the tax credits and other tax benefits received and recognizes the net investment performance in the income statement as a component of income tax expense (benefit). The pronouncement should be applied retrospectively for all periods presented, effective for annual periods and interim reporting periods within those annual periods, beginning after December 15, 2014. Early adoption is permitted. The adoption of this pronouncement is not expected to have a material impact on WesBanco’s Consolidated Financial Statements.
	In July 2013, the FASB issued an accounting pronouncement (ASU 2013-11) to improve the reporting for unrecognized tax benefits when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists. The pronouncement is expected to reduce diversity in practice by providing guidance on the presentation of unrecognized tax benefits and will better reflect the manner in which an entity would settle at the reporting date any additional income taxes that would result from the disallowance of a tax position when net operating loss carryforwards, similar tax losses, or tax credit carryforwards exist. The pronouncement is effective prospectively for fiscal years, and interim periods within those years, beginning after December 15, 2013. The adoption of this pronouncement did not have a material impact on WesBanco’s Consolidated Financial Statements.

Earnings_Per_Common_Share_Tabl

Earnings Per Common Share (Tables)	6 Months Ended
	Jun. 30, 2014
Earnings Per Share [Abstract]	'
Summary of Earnings Per Common Share	'
	Earnings per common share are calculated as follows:
		For the Three Months Ended				For the Six Months Ended
		June 30,				June 30,
	(unaudited, in thousands, except shares and per share amounts)	2014		2013		2014		2013
	Numerator for both basic and diluted earnings per common share:
	Net income	$	18,875	$	17,017	$	35,296	$	33,037
	Denominator:
	Total average basic common shares outstanding		29,242,180		29,245,201		29,212,347		29,228,355
	Effect of dilutive stock options and warrant		79,747		63,605		81,077		59,663
	Total diluted average common shares outstanding		29,321,927		29,308,806		29,293,424		29,288,018
	Earnings per common share - basic	$	0.65	$	0.58	$	1.21	$	1.13
	Earnings per common share - diluted	$	0.64	$	0.58	$	1.2	$	1.13

Securities_Tables

Securities (Tables)	6 Months Ended
	Jun. 30, 2014
Investments Debt And Equity Securities [Abstract]	'
Schedule of Fair Value and Amortized Cost of Available-for-sale and Held-to-maturity Securities	'
	The following table presents the fair value and amortized cost of available-for-sale and held-to-maturity securities:
			June 30, 2014										December 31, 2013
	(unaudited, in thousands)		Amortized		Gross			Gross			Estimated		Amortized			Gross		Gross			Estimated
			Cost		Unrealized			Unrealized			Fair Value		Cost			Unrealized		Unrealized			Fair Value
					Gains			Losses								Gains		Losses
	Available-for-sale
	Obligations of government agencies		$	79,164	$	382		$	(644	)	$	78,902	$	75,164		$	6	$	(1,938	)	$	73,232
	Residential mortgage-backed securities and collateralized mortgage obligations of government agencies			772,918		4,114			(9,550	)		767,482		707,000			3,191		(15,924	)		694,267
	Obligations of states and political subdivisions			104,553		5,700			(14	)		110,239		112,536			4,165		(355	)		116,346
	Corporate debt securities			36,731		260			(99	)		36,892		38,777			174		(470	)		38,481
	Total debt securities		$	993,366	$	10,456		$	(10,307	)	$	993,515	$	933,477		$	7,536	$	(18,687	)	$	922,326
	Equity securities			11,270		1,294			—			12,564		10,597			1,463		—			12,060
	Total available-for-sale securities		$	1,004,636	$	11,750		$	(10,307	)	$	1,006,079	$	944,074		$	8,999	$	(18,687	)	$	934,386
	Held-to-maturity
	Residential mortgage-backed securities and collateralized mortgage obligations of government agencies		$	88,897	$	3,705		$	(501	)	$	92,101	$	99,409		$	2,804	$	(1,023	)	$	101,190
	Obligations of states and political subdivisions			513,058		20,866			(3,206	)		530,718		496,396			10,158		(13,906	)		492,648
	Corporate debt securities			5,740		66			(85	)		5,721		2,715			—		(245	)		2,470
	Total held-to-maturity securities		$	607,695	$	24,637		$	(3,792	)	$	628,540	$	598,520		$	12,962	$	(15,174	)	$	596,308
	Total securities		$	1,612,331	$	36,387		$	(14,099	)	$	1,634,619	$	1,542,594		$	21,961	$	(33,861	)	$	1,530,694
Schedule of Fair Value of Available-for-sale and Held-to-maturity Securities by Contractual Maturity	'
	The following table presents the fair value of available-for-sale and held-to-maturity securities by contractual maturity at June 30, 2014. In some instances, the issuers may have the right to call or prepay obligations without penalty prior to the contractual maturity date.
			June 30, 2014
	(unaudited, in thousands)		One Year		One to			Five to			After		Mortgage-backed			Total
			or less		Five Years			Ten Years			Ten Years		and Equity
	Available-for-sale
	Obligations of government agencies		$	313	$	9,833		$	26,123		$	42,633	$	—		$	78,902
	Residential mortgage-backed securities and collateralized mortgage obligations of government agencies (1)			—		—			—			—		767,482			767,482
	Obligations of states and political subdivisions			7,072		43,257			21,615			38,295		—			110,239
	Corporate debt securities			4,018		15,939			12,044			4,891		—			36,892
	Equity securities (2)			—		—			—			—		12,564			12,564
	Total available-for-sale securities		$	11,403	$	69,029		$	59,782		$	85,819	$	780,046		$	1,006,079
	Held-to-maturity (3)
	Residential mortgage-backed securities and collateralized mortgage obligations of government agencies (1)		$	—	$	—		$	—		$	—	$	92,101		$	92,101
	Obligations of states and political subdivisions			4,743		12,390			178,977			334,608		—			530,718
	Corporate debt securities			—		—			5,721			—		—			5,721
	Total held-to-maturity securities		$	4,743	$	12,390		$	184,698		$	334,608	$	92,101		$	628,540
	Total securities		$	16,146	$	81,419		$	244,480		$	420,427	$	872,147		$	1,634,619
	(1)	Mortgage-backed and collateralized mortgage securities, which have prepayment provisions, are not assigned to maturity categories due to fluctuations in their prepayment speeds.
	-2	Equity securities, which have no stated maturity, are not assigned a maturity category.
	(3)	The held-to-maturity portfolio is carried at an amortized cost of $607.7 million.
Schedule of Unrealized Losses on Investment Securities	'
	The following tables provide information on unrealized losses on investment securities that have been in an unrealized loss position for less than twelve months and twelve months or more as of June 30, 2014 and December 31, 2013:
			June 30, 2014
			Less than 12 months								12 months or more							Total
			Fair		Unrealized			# of			Fair		Unrealized			# of		Fair			Unrealized			# of
	(unaudited, dollars in thousands)		Value		Losses			Securities			Value		Losses			Securities		Value			Losses			Securities
	Obligations of government agencies		$	18,919	$	(124	)		5		$	19,790	$	(520	)		5	$	38,709		$	(644	)		10
	Residential mortgage-backed securities and collateralized mortgage obligations of government agencies			191,506		(1,380	)		37			239,724		(8,671	)		42		431,230			(10,051	)		79
	Obligations of states and political subdivisions			20,790		(107	)		34			115,199		(3,113	)		177		135,989			(3,220	)		211
	Corporate debt securities			4,996		(4	)		1			4,525		(180	)		2		9,521			(184	)		3
	Total temporarily impaired securities		$	236,211	$	(1,615	)		77		$	379,238	$	(12,484	)		226	$	615,449		$	(14,099	)		303
			31-Dec-13
			Less than 12 months								12 months or more							Total
			Fair		Unrealized			# of			Fair		Unrealized			# of		Fair			Unrealized			# of
	(unaudited, dollars in thousands)		Value		Losses			Securities			Value		Losses			Securities		Value			Losses			Securities
	Obligations of government agencies		$	54,356	$	(1,911	)		15		$	5,083	$	(27	)		2	$	59,439		$	(1,938	)		17
	Residential mortgage-backed securities and collateralized mortgage obligations of government agencies			513,495		(14,639	)		89			37,002		(2,308	)		11		550,497			(16,947	)		100
	Obligations of states and political subdivisions			181,667		(10,830	)		277			47,793		(3,431	)		76		229,460			(14,261	)		353
	Corporate debt securities			19,837		(560	)		7			2,845		(155	)		1		22,682			(715	)		8
	Total temporarily impaired securities		$	769,355	$	(27,940	)		388		$	92,723	$	(5,921	)		90	$	862,078		$	(33,861	)		478

Loans_and_the_Allowance_for_Cr1

Loans and the Allowance for Credit Losses (Tables)	6 Months Ended
	Jun. 30, 2014
Receivables [Abstract]	'
Schedule of Recorded Investment in Loans by Category	'
	The recorded investment in loans is presented in the Consolidated Balance Sheets net of deferred loan fees and costs of $2.8 million and $2.7 million at June 30, 2014 and December 31, 2013, respectively.
			June 30,			December 31,
	(unaudited, in thousands)		2014			2013
	Commercial real estate:
	Land and construction		$	255,499		$	263,117
	Improved property			1,685,373			1,649,802
	Total commercial real estate			1,940,872			1,912,919
	Commercial and industrial			578,665			556,249
	Residential real estate			898,357			890,804
	Home equity			295,127			284,687
	Consumer			233,097			250,258
	Total portfolio loans			3,946,118			3,894,917
	Loans held for sale			10,641			5,855
	Total loans		$	3,956,759		$	3,900,772
Summary of Changes in Allowance for Credit Losses	'
	The following tables summarize changes in the allowance for credit losses applicable to each category of the loan portfolio:
			Allowance for Credit Losses By Category
			For the Six Months Ended June 30, 2014 and 2013
	(unaudited, in thousands)		Commercial			Commercial			Commercial			Residential			Home			Consumer			Deposit			Total
			Real Estate -			Real Estate -			& Industrial			Real Estate			Equity						Overdraft
			Land and			Improved
			Construction			Property
	Balance at December 31, 2013:
	Allowance for loan losses		$	6,056		$	18,157		$	9,925		$	5,673		$	2,017		$	5,020		$	520		$	47,368
	Allowance for loan commitments			301			62			130			5			85			19			—			602
	Total beginning allowance for credit losses			6,357			18,219			10,055			5,678			2,102			5,039			520			47,970
	Provision for credit losses:
	Provision for loan losses			(405	)		(511	)		1,870			575			392			642			551			3,114
	Provision for loan commitments			(20	)		(52	)		1			—			5			—			—			(66	)
	Total provision for credit losses			(425	)		(563	)		1,871			575			397			642			551			3,048
	Charge-offs			—			(728	)		(2,384	)		(1,207	)		(348	)		(1,610	)		(362	)		(6,639	)
	Recoveries			—			390			543			248			71			512			134			1,898
	Net charge-offs			—			(338	)		(1,841	)		(959	)		(277	)		(1,098	)		(228	)		(4,741	)
	Balance at June 30, 2014:
	Allowance for loan losses			5,651			17,308			9,954			5,289			2,132			4,564			843			45,741
	Allowance for loan commitments			281			10			131			5			90			19			—			536
	Total ending allowance for credit losses		$	5,932		$	17,318		$	10,085		$	5,294		$	2,222		$	4,583		$	843		$	46,277
	Balance at December 31, 2012:
	Allowance for loan losses		$	3,741		$	23,614		$	9,326		$	7,182		$	2,458		$	5,557		$	821		$	52,699
	Allowance for loan commitments			27			25			215			6			49			19			—			341
	Total beginning allowance for credit losses			3,768			23,639			9,541			7,188			2,507			5,576			821			53,040
	Provision for credit losses:
	Provision for loan losses			559			1,855			(208	)		87			(32	)		836			50			3,147
	Provision for loan commitments			11			(2	)		(77	)		—			44			—			—			(24	)
	Total provision for credit losses			570			1,853			(285	)		87			12			836			50			3,123
	Charge-offs			(373	)		(1,395	)		(919	)		(1,573	)		(346	)		(2,043	)		(414	)		(7,063	)
	Recoveries			10			420			273			113			43			607			132			1,598
	Net charge-offs			(363	)		(975	)		(646	)		(1,460	)		(303	)		(1,436	)		(282	)		(5,465	)
	Balance at June 30, 2013:
	Allowance for loan losses			3,937			24,494			8,472			5,809			2,123			4,957			589			50,381
	Allowance for loan commitments			38			23			138			6			93			19			—			317
	Total ending allowance for credit losses		$	3,975		$	24,517		$	8,610		$	5,815		$	2,216		$	4,976		$	589		$	50,698
Allowance for Credit Losses and Recorded Investment in Loans	'
	The following tables present the allowance for credit losses and recorded investment in loans by category:
			Allowance for Credit Losses and Recorded Investment in Loans
	(unaudited, in thousands)		Commercial			Commercial			Commercial			Residential			Home			Consumer			Over-draft			Total
			Real Estate-			Real Estate-			and Industrial			Real Estate			Equity
			Land and			Improved
			Construction			Property
	June 30, 2014
	Allowance for credit losses:
	Allowance for loans individually evaluated for impairment		$	—		$	39		$	1,029		$	—		$	—		$	—		$	—		$	1,068
	Allowance for loans collectively evaluated for impairment			5,651			17,269			8,925			5,289			2,132			4,564			843			44,673
	Allowance for loan commitments			281			10			131			5			90			19			—			536
	Total allowance for credit losses		$	5,932		$	17,318		$	10,085		$	5,294		$	2,222		$	4,583		$	843		$	46,277
	Portfolio loans:
	Individually evaluated for impairment (1)		$	—		$	4,264		$	3,084		$	—		$	—		$	—		$	—		$	7,348
	Collectively evaluated for impairment			255,499			1,681,109			575,581			898,357			295,127			233,097			—			3,938,770
	Total portfolio loans		$	255,499		$	1,685,373		$	578,665		$	898,357		$	295,127		$	233,097		$	—		$	3,946,118
	December 31, 2013
	Allowance for credit losses:
	Allowance for loans individually evaluated for impairment		$	—		$	51		$	681		$	—		$	—		$	—		$	—		$	732
	Allowance for loans collectively evaluated for impairment			6,056			18,106			9,244			5,673			2,017			5,020			520			46,636
	Allowance for loan commitments			301			62			130			5			85			19			—			602
	Total allowance for credit losses		$	6,357		$	18,219		$	10,055		$	5,678		$	2,102		$	5,039		$	520		$	47,970
	Portfolio loans:
	Individually evaluated for impairment (1)		$	—		$	4,321		$	1,754		$	—		$	—		$	—		$	—		$	6,075
	Collectively evaluated for impairment			263,117			1,645,481			554,495			890,804			284,687			250,258			—			3,888,842
	Total portfolio loans		$	263,117		$	1,649,802		$	556,249		$	890,804		$	284,687		$	250,258		$	—		$	3,894,917
	(1)	Commercial loans greater than $1 million that are reported as non-accrual or as a troubled debt restructuring (“TDR”) are individually evaluated for impairment.
Summary of Commercial Loans by Risk Grade	'
	The following tables summarize commercial loans by their assigned risk grade:
			Commerical Loans by Internally Assigned Risk Grade
	(unaudited, in thousands)		Commercial			Commercial			Commercial			Total
			Real Estate-			Real Estate-			& Industrial			Commercial
			Land and			Improved						Loans
			Construction			Property
	As of June 30, 2014
	Excellent - minimal risk		$	—		$	352		$	72,161		$	72,513
	Good - desirable risk			23,884			707,407			201,844			933,135
	Fair - acceptable risk			222,915			885,735			283,772			1,392,422
	Criticized - marginal			6,282			50,934			11,491			68,707
	Classified - substandard			2,418			40,945			9,397			52,760
	Classified - doubtful			—			—			—			—
	Total		$	255,499		$	1,685,373		$	578,665		$	2,519,537
	As of December 31, 2013
	Excellent - minimal risk		$	—		$	360		$	73,389		$	73,749
	Good - desirable risk			39,409			710,137			197,269			946,815
	Fair - acceptable risk			213,822			838,283			260,915			1,313,020
	Criticized - marginal			6,498			57,983			10,768			75,249
	Classified - substandard			3,388			43,039			13,908			60,335
	Classified - doubtful			—			—			—			—
	Total		$	263,117		$	1,649,802		$	556,249		$	2,469,168
Summary of Age Analysis of Loan Categories	'
	The following tables summarize the age analysis of all categories of loans:
			Age Analysis of Loans
	(unaudited, in thousands)		Current			30-59			60-89			90 Days			Total			Total Loans			90 Days or
						Days			Days			or More			Past Due						More
						Past Due			Past Due			Past Due									Past Due and
																					Accruing (1)
	As of June 30, 2014
	Commercial real estate:
	Land and construction		$	253,610		$	290		$	1		$	1,598		$	1,889		$	255,499		$	248
	Improved property			1,669,880			456			967			14,070			15,493			1,685,373			—
	Total commercial real estate			1,923,490			746			968			15,668			17,382			1,940,872			248
	Commercial and industrial			574,121			1,594			229			2,721			4,544			578,665			6
	Residential real estate			884,456			1,554			2,692			9,655			13,901			898,357			1,843
	Home equity			291,075			2,004			666			1,382			4,052			295,127			628
	Consumer			229,714			2,492			529			362			3,383			233,097			222
	Total portfolio loans			3,902,856			8,390			5,084			29,788			43,262			3,946,118			2,947
	Loans held for sale			10,641			—			—			—			—			10,641			—
	Total loans		$	3,913,497		$	8,390		$	5,084		$	29,788		$	43,262		$	3,956,759		$	2,947
	Impaired loans included above are as follows:
	Non-accrual loans		$	6,636		$	1,694		$	1,060		$	26,728		$	29,482		$	36,118
	TDRs accruing interest (1)			12,818			167			415			113			695			13,513
	Total impaired		$	19,454		$	1,861		$	1,475		$	26,841		$	30,177		$	49,631
	As of December 31, 2013
	Commercial real estate:
	Land and construction		$	261,165		$	2		$	—		$	1,950		$	1,952		$	263,117		$	248
	Improved property			1,632,973			2,482			2,346			12,001			16,829			1,649,802			318
	Total commercial real estate			1,894,138			2,484			2,346			13,951			18,781			1,912,919			566
	Commercial and industrial			552,414			1,112			977			1,746			3,835			556,249			—
	Residential real estate			875,192			1,641			4,710			9,261			15,612			890,804			1,289
	Home equity			281,004			1,581			470			1,632			3,683			284,687			411
	Consumer			245,876			3,223			649			510			4,382			250,258			325
	Total portfolio loans			3,848,624			10,041			9,152			27,100			46,293			3,894,917			2,591
	Loans held for sale			5,855			—			—			—			—			5,855			—
	Total loans		$	3,854,479		$	10,041		$	9,152		$	27,100		$	46,293		$	3,900,772		$	2,591
	Impaired loans included above are as follows:
	Non-accrual loans		$	9,028		$	588		$	2,722		$	24,295		$	27,605		$	36,633
	TDRs accruing interest (1)			13,595			171			881			214			1,266			14,861
	Total impaired		$	22,623		$	759		$	3,603		$	24,509		$	28,871		$	51,494
	-1	Loans 90 days or more past due and accruing interest exclude TDRs 90 days or more past due and accruing interest.
Summary of Impaired Loans	'
	The following tables summarize impaired loans:
			Impaired Loans
			June 30, 2014									December 31, 2013
	(unaudited, in thousands)		Unpaid			Recorded			Related			Unpaid			Recorded			Related
			Principal			Investment			Allowance			Principal			Investment			Allowance
			Balance (1)									Balance (1)
	With no related specific allowance recorded:
	Commercial real estate:
	Land and construction		$	2,050		$	1,950		$	—		$	2,663		$	2,564		$	—
	Improved property			19,719			18,455			—			21,421			19,628			—
	Commercial and industrial			4,970			4,428			—			3,773			3,249			—
	Residential real estate			20,726			18,891			—			22,006			20,090			—
	Home equity			2,355			2,118			—			2,675			2,506			—
	Consumer			1,317			1,103			—			1,402			1,182			—
	Total impaired loans without a specific allowance			51,137			46,945			—			53,940			49,219			—
	With a specific allowance recorded:
	Commercial real estate:
	Improved property			725			725			39			729			729			51
	Commercial and industrial			1,961			1,961			1,029			1,546			1,546			681
	Total impaired loans with a specific allowance			2,686			2,686			1,068			2,275			2,275			732
	Total impaired loans		$	53,823		$	49,631		$	1,068		$	56,215		$	51,494		$	732
	-1	The difference between the unpaid principal balance and the recorded investment generally reflects amounts that have been previously charged-off.
			Impaired Loans
			For the Three Months Ended												For the Six Months Ended
			June 30, 2014						June 30, 2013						June 30, 2014						June 30, 2013
	(unaudited, in thousands)		Average			Interest			Average			Interest			Average			Interest			Average			Interest
			Recorded			Income			Recorded			Income			Recorded			Income			Recorded			Income
			Investment			Recognized			Investment			Recognized			Investment			Recognized			Investment			Recognized
	With no related specific allowance recorded:
	Commercial real estate:
	Land and construction		$	2,143		$	13		$	5,704		$	37		$	2,283		$	15		$	5,661		$	97
	Improved Property			18,572			133			24,428			185			18,924			153			24,437			316
	Commercial and industrial			4,122			57			3,974			28			3,831			89			3,989			61
	Residential real estate			18,864			209			19,462			171			19,272			391			19,731			365
	Home equity			2,173			16			2,034			15			2,284			35			2,092			30
	Consumer			1,135			18			1,433			22			1,150			46			1,461			49
	Total impaired loans without a specific allowance			47,009			446			57,035			458			47,744			729			57,371			918
	With a specific allowance recorded:
	Commercial real estate:
	Land and construction			—			—			1,540			9			—			—			1,569			22
	Improved Property			727			3			4,168			17			727			4			4,106			32
	Commercial and industrial			2,537			29			—			—			2,206			41			—			—
	Total impaired loans with a specific allowance			3,264			32			5,708			26			2,933			45			5,675			54
	Total impaired loans		$	50,273		$	478		$	62,743		$	484		$	50,677		$	774		$	63,046		$	972
Recorded Investment in Non-Accrual Loans and TDRs	'
	The following tables present the recorded investment in non-accrual loans and TDRs:
			Non-accrual Loans (1)
	(unaudited, in thousands)		June 30,			December 31,
			2014			2013
	Commercial real estate:
	Land and construction		$	1,950		$	2,564
	Improved property			15,946			17,305
	Total commercial real estate			17,896			19,869
	Commercial and industrial			6,167			4,380
	Residential real estate			10,137			10,240
	Home equity			1,283			1,604
	Consumer			635			540
	Total		$	36,118		$	36,633
	(1)	Total non-accrual loans include loans that are also restructured. Such loans are also set forth in the following table as non-accrual TDRs.
			TDRs
			June 30, 2014									December 31, 2013
	(unaudited, in thousands)		Accruing			Non-			Total			Accruing			Non-			Total
						Accrual									Accrual
	Commercial real estate:
	Land and construction		$	—		$	1,008		$	1,008		$	—		$	1,601		$	1,601
	Improved property			3,234			1,944			5,178			3,052			3,658			6,710
	Total commercial real estate			3,234			2,952			6,186			3,052			5,259			8,311
	Commercial and industrial			222			403			625			415			579			994
	Residential real estate			8,754			2,414			11,168			9,850			2,991			12,841
	Home equity			835			217			1,052			902			289			1,191
	Consumer			468			295			763			642			206			848
	Total		$	13,513		$	6,281		$	19,794		$	14,861		$	9,324		$	24,185
Loans Identified as TDRs	'
	The following tables present details related to loans identified as TDRs during the three and six months ended June 30, 2014 and June 30, 2013, respectively:
			New TDRs (1)
			For the Three Months Ended
			June 30, 2014									June 30, 2013
	(unaudited, dollars in thousands)		Number  of			Pre-			Post-			Number  of			Pre-			Post-
			Modifications			Modification			Modification			Modifications			Modification			Modification
						Outstanding			Outstanding						Outstanding			Outstanding
						Recorded			Recorded						Recorded			Recorded
						Investment			Investment						Investment			Investment
	Commercial real estate:
	Land and construction			—		$	—		$	—			—		$	—		$	—
	Improved Property			1			112			112			3			120			120
	Total commercial real estate			1			112			112			3			120			120
	Commercial and industrial			—			—			—			—			—			—
	Residential real estate			2			70			70			9			673			672
	Home equity			—			—			—			1			13			13
	Consumer			9			100			93			3			36			35
	Total			12		$	282		$	275			16		$	842		$	840
	(1)	Excludes loans that were either paid off or charged-off by period end. The pre-modification balance represents the balance outstanding at the beginning of the period. The post-modification balance represents the outstanding balance at period end.
			New TDRs (1)
			For the Six Months Ended
			June 30, 2014									June 30, 2013
	(unaudited, dollars in thousands)		Number of			Pre-			Post-			Number  of			Pre-			Post-
			Modifications			Modification			Modification			Modifications			Modification			Modification
						Outstanding			Outstanding						Outstanding			Outstanding
						Recorded			Recorded						Recorded			Recorded
						Investment			Investment						Investment			Investment
	Commercial real estate:
	Land and construction			—		$	—		$	—			1		$	299		$	295
	Improved Property			2			203			201			8			1,011			836
	Total commercial real estate			2			203			201			9			1,310			1,131
	Commercial and industrial			—			—			—			6			161			161
	Residential real estate			5			189			185			16			1,883			1,819
	Home equity			—			—			—			1			14			13
	Consumer			11			138			123			8			73			67
	Total			18		$	530		$	509			40		$	3,441		$	3,191
	(1)	Excludes loans that were either paid off or charged-off by period end. The pre-modification balance represents the balance outstanding at the beginning of the period. The post-modification balance represents the outstanding balance at period end.
TDRs Defaulted Later Restructured	'
	The following tables summarize TDRs which defaulted (defined as past due 90 days or more) during the three and six months ended June 30, 2014 and 2013 that were restructured within the last twelve months prior to June 30, 2014 and 2013:
			Defaulted TDRs (1)
			For the Three Months Ended
			June 30, 2014						June 30, 2013
	(unaudited, dollars in thousands)		Number of			Recorded			Number of			Recorded
			Defaults			Investment			Defaults			Investment
	Commercial real estate:
	Land and construction			—		$	—			—		$	—
	Improved property			—			—			—			—
	Total commercial real estate			—			—			—			—
	Commercial and industrial			—			—			—			—
	Residential real estate			—			—			5			312
	Home equity			—			—			1			21
	Consumer			—			—			—			—
	Total			—		$	—			6		$	333
	(1)	Excludes loans that were either charged-off or cured by period end. The recorded investment is as of June 30, 2014 and 2013.
			Defaulted TDRs (1)
			For the Six Months Ended
			June 30, 2014						June 30, 2013
	(unaudited, dollars in thousands)		Number of			Recorded			Number of			Recorded
			Defaults			Investment			Defaults			Investment
	Commercial real estate:
	Land and construction			—		$	—			—		$	—
	Improved property			—			—			2			645
	Total commercial real estate			—			—			2			645
	Commercial and industrial			—			—			3			313
	Residential real estate			4			236			19			1,634
	Home equity			—			—			6			124
	Consumer			—			—			1			32
	Total			4		$	236			31		$	2,748
	(1)	Excludes loans that were either charged-off or cured by period end. The recorded investment is as of June 30, 2014 and 2013.
Summary of Other Real Estate Owned and Repossessed Assets	'
	The following table summarizes other real estate owned and repossessed assets included in other assets:
	(unaudited, in thousands)		June 30,			December 31,
			2014			2013
	Other real estate owned		$	4,923		$	4,689
	Repossessed assets			183			171
	Total other real estate owned and repossessed assets		$	5,106		$	4,860

Pension_Plan_Tables

Pension Plan (Tables)	6 Months Ended
	Jun. 30, 2014
Compensation And Retirement Disclosure [Abstract]	'
Components of Net Periodic Pension Cost	'
	The following table presents the net periodic pension cost for WesBanco’s Defined Benefit Pension Plan (the “Plan”) and the related components:
		For the Three Months Ended						For the Six Months  Ended
		June 30,						June 30,
	(unaudited, in thousands)	2014			2013			2014			2013
	Service cost - benefits earned during year	$	725		$	698		$	1,442		$	1,655
	Interest cost on projected benefit obligation		1,183			982			2,353			2,078
	Expected return on plan assets		(1,802	)		(1,437	)		(3,585	)		(3,040	)
	Amortization of prior service cost		11			11			22			23
	Amortization of net loss		367			897			730			1,720
	Net periodic pension cost	$	484		$	1,151		$	962		$	2,436

Fair_Value_Measurement_Tables

Fair Value Measurement (Tables)	6 Months Ended
	Jun. 30, 2014
Fair Value Disclosures [Abstract]	'
Schedule of Fair Value of Assets and Liabilities Measured on Recurring and Nonrecurring Basis	'
	The following tables set forth WesBanco’s financial assets and liabilities that were accounted for at fair value on a recurring and nonrecurring basis by level within the fair value hierarchy as of June 30, 2014 and December 31, 2013:
					June 30, 2014
					Fair Value Measurements Using:
	(unaudited, in thousands)		June 30,		Quoted Prices in			Significant  Other		Significant
			2014		Active  Markets			Observable		Unobservable
					for Identical			Inputs		Inputs
					Assets (level 1)			(level 2)		(level 3)
	Recurring fair value measurements
	Securities - available-for-sale
	Obligations of government agencies		$	78,902	$	—		$	78,902	$	—
	Residential mortgage-backed securities and collateralized mortgage obligations of government agencies			767,482		—			767,482		—
	Obligations of state and political subdivisions			110,239		—			110,239		—
	Corporate debt securities			36,892		—			36,892		—
	Equity securities			12,564		10,558			2,006		—
	Total securities - available-for-sale		$	1,006,079	$	10,558		$	995,521	$	—
	Total recurring fair value measurements		$	1,006,079	$	10,558		$	995,521	$	—
	Nonrecurring fair value measurements
	Impaired loans		$	1,618	$	—		$	—	$	1,618
	Other real estate owned and repossessed assets			5,106		—			—		5,106
	Loans held for sale			10,641		—			10,641		—
	Total nonrecurring fair value measurements		$	17,365	$	—		$	10,641	$	6,724
					December 31, 2013
					Fair Value Measurements Using:
	(unaudited, in thousands)		December 31,		Quoted Prices in			Significant  Other		Significant
			2013		Active  Markets			Observable		Unobservable
					for Identical			Inputs		Inputs
					Assets (level 1)			(level 2)		(level 3)
	Recurring fair value measurements
	Securities - available-for-sale
	Obligations of government agencies		$	73,232	$	—		$	73,232	$	—
	Residential mortgage-backed securities and collateralized mortgage obligations of government agencies			694,267		—			694,267		—
	Obligations of state and political subdivisions			116,346		—			116,346		—
	Corporate debt securities			38,481		—			38,481		—
	Equity securities			12,060		9,962			2,098		—
	Total securities - available-for-sale		$	934,386	$	9,962		$	924,424	$	—
	Total recurring fair value measurements		$	934,386	$	9,962		$	924,424	$	—
	Nonrecurring fair value measurements
	Impaired loans		$	1,543	$	—		$	—	$	1,543
	Other real estate owned and repossessed assets			4,860		—			—		4,860
	Loans held for sale			5,855		—			5,855		—
	Total nonrecurring fair value measurements		$	12,258	$	—		$	5,855	$	6,403
Schedule of Assets Measured at Fair Value on Nonrecurring Basis	'
	The following table presents additional quantitative information about assets measured at fair value on a nonrecurring basis and for which WesBanco has utilized level 3 inputs to determine fair value:
			Quantitative Information about Level 3 Fair Value Measurements
	(unaudited, in thousands)		Fair Value		Valuation Techniques		Unobservable Input	Range / Weighted Average
			Estimate
	30-Jun-14
	Impaired loans		$	1,618	Appraisal of collateral (1)		Appraisal adjustments (2)	0% to (36.1%) / (22.7%)
							Liquidation expenses (2)	(1.0%) to (8.0%) / (3.7%)
	Other real estate owned and repossessed assets			5,106	Appraisal of collateral (1), (3)
	December 31, 2013:
	Impaired loans		$	1,543	Appraisal of collateral (1)		Appraisal adjustments (2)	0% to (29.1%) / (15.6%)
							Liquidation expenses (2)	(3.5%) to (8.0%) / (4.7%)
	Other real estate owned and repossessed assets			4,860	Appraisal of collateral (1), (3)
	-1	Fair value is generally determined through independent appraisals of the underlying collateral, which generally include various level 3 inputs which are not identifiable.
	(2)	Appraisals may be adjusted by management for qualitative factors such as economic conditions and estimated liquidation expenses. The range and weighted average of appraisal adjustments and liquidation expenses are presented as a percent of the appraisal.
	(3)	Includes estimated liquidation expenses and numerous dissimilar qualitative adjustments by management which are not identifiable.
Estimates Fair Value of Financial Instruments	'
	The estimated fair values of WesBanco’s financial instruments are summarized below:
								Fair Value Measurements
	(unaudited in thousands)		Carrying		Fair Value			Quoted Prices in		Significant  Other		Significant
			Amount		Estimate			Active  Markets		Observable		Unobservable
								for Identical		Inputs		Inputs
								Assets (level 1)		(level 2)		(level 3)
	June 30, 2014
	Financial Assets
	Cash and due from banks		$	94,488	$	94,488		$	94,488	$	—	$	—
	Securities available-for-sale			1,006,079		1,006,079			10,558		995,521		—
	Securities held-to-maturity			607,695		628,540			—		627,805		735
	Net loans			3,900,377		3,784,772			—		—		3,784,772
	Loans held for sale			10,641		10,641			—		10,641		—
	Accrued interest receivable			19,087		19,087			19,087		—		—
	Bank-owned life insurance			121,878		121,878			121,878		—		—
	Financial Liabilities
	Deposits			5,117,403		5,127,522			3,691,573		1,435,949		—
	Federal Home Loan Bank borrowings			138,596		141,126			—		141,126		—
	Other borrowings			94,745		96,661			68,475		28,186		—
	Junior subordinated debt			106,156		77,075			—		77,075		—
	Accrued interest payable			2,306		2,306			2,306		—		—
	December 31, 2013:
	Financial Assets
	Cash and due from banks		$	95,551	$	95,551		$	95,551	$	—	$	—
	Securities available-for-sale			934,386		934,386			9,962		924,424		—
	Securities held-to-maturity			598,520		596,308			—		595,581		727
	Net loans			3,847,549		3,754,465			—		—		3,754,465
	Loans held for sale			5,855		5,855			—		5,855		—
	Accrued interest receivable			18,960		18,960			18,960		—		—
	Bank-owned life insurance			121,390		121,390			121,390		—		—
	Financial Liabilities
	Deposits			5,062,530		5,076,207			3,551,052		1,525,155		—
	Federal Home Loan Bank borrowings			39,508		42,314			—		42,314		—
	Other borrowings			150,536		153,015			104,196		48,819		—
	Junior subordinated debt			106,137		74,038			—		74,038		—
	Accrued interest payable			2,354		2,354			2,354		—		—

Comprehensive_Income_Tables

Comprehensive Income (Tables)	6 Months Ended
	Jun. 30, 2014
Equity [Abstract]	'
Components of Accumulated Other Comprehensive Income	'
	The activity in accumulated other comprehensive income for the six months ended June 30, 2014 and 2013 is as follows:
			Accumulated Other Comprehensive Income(1)
	(unaudited, in thousands)		Defined			Unrealized Gains			Unrealized Gains			Total
			Benefit			(Losses) on			on Securities
			Pension			Securities			Transferred
			Plan			Available-for-Sale			from Available-
									for-Sale to
									Held-to-Maturity
	Balance at December 31, 2013		$	(7,966	)	$	(6,126	)	$	1,358		$	(12,734	)
	Other comprehensive income before reclassifications			—			7,194			—			7,194
	Amounts reclassified from accumulated other comprehensive income			475			(157	)	$	(171	)		147
	Period change			475			7,037		$	(171	)		7,341
	Balance at June 30, 2014		$	(7,491	)	$	911		$	1,187		$	(5,393	)
	Balance at December 31, 2012		$	(21,401	)	$	13,032		$	2,004		$	(6,365	)
	Other comprehensive income before reclassifications			—			(11,526	)		—			(11,526	)
	Amounts reclassified from accumulated other comprehensive income			1,050			(82	)		(406	)		562
	Period change			1,050			(11,608	)		(406	)		(10,964	)
	Balance at June 30, 2013		$	(20,351	)	$	1,424		$	1,598		$	(17,329	)
	(1)	All amounts are net of tax. Related income tax expense or benefit is calculated using a combined Federal and State income tax rate approximating 36.5%.
Schedule of Amounts Reclassified from Accumulated Other Comprehensive Income	'
	The following table provides details about amounts reclassified from accumulated other comprehensive income for the three and six months ended June 30, 2014 and 2013:
	Details about Accumulated Other Comprehensive		For the Three Months Ended						For the Six Months  Ended						Affected Line Item in the
	Income Components		June 30,						June 30,						Statement of Net Income
	(unaudited, in thousands)		2014			2013			2014			2013
	Securities available-for-sale (1):
	Net securities gains reclassified into earnings		$	(170	)	$	(113	)	$	(248	)	$	(129	)	Net securities gains (Non-interest income)
	Related income tax expense			63			42			91			47		Provision for income taxes
	Net effect on accumulated other comprehensive income for the period			(107	)		(71	)		(157	)		(82	)
	Securities held-to-maturity (1):
	Amortization of unrealized gain transferred from available-for-sale			(132	)		(362	)		(270	)		(650	)	Interest and dividends on securities (Interest and dividend income)
	Related income tax expense			48			133			99			244		Provision for income taxes
	Net effect on accumulated other comprehensive income for the period			(84	)		(229	)		(171	)		(406	)
	Defined benefit pension plan (2):
	Amortization of net loss and prior service costs			378			909			752			1,743		Employee benefits (Non-interest expense)
	Related income tax expense			(139	)		(334	)		(277	)		(693	)	Provision for income taxes
	Net effect on accumulated other comprehensive income for the period			239			575			475			1,050
	Total reclassifications for the period		$	48		$	275			147		$	562
	(1)	For additional detail related to unrealized gains on securities and related amounts reclassified from accumulated other comprehensive income see Note 3, “Securities.”
	(2)	Included in the computation of net periodic pension cost. See Note 5, “Pension Plan” for additional detail.

Commitments_and_Contingent_Lia1

Commitments and Contingent Liabilities (Tables)	6 Months Ended
	Jun. 30, 2014
Commitments And Contingencies Disclosure [Abstract]	'
Commitments to Extend Credit, Guarantees and Various Letters of Credit Outstanding	'
	The following table presents total commitments to extend credit, guarantees and various letters of credit outstanding:
	(unaudited, in thousands)	June 30,		December 31,
		2014		2013
	Lines of credit	$	936,986	$	964,777
	Loans approved but not closed		132,542		73,937
	Overdraft limits		88,648		96,291
	Letters of credit		26,212		18,686
	Contingent obligations to purchase loans funded by other entities		6,313		6,327

Business_Segments_Tables

Business Segments (Tables)	6 Months Ended
	Jun. 30, 2014
Segment Reporting [Abstract]	'
Financial Information by Business Segment	'
	Condensed financial information by business segment is presented below:
	(unaudited, in thousands)	Community		Trust and		Consolidated
		Banking		Investment
				Services
	For the Three Months ended June 30, 2014:
	Interest income	$	54,044	$	—	$	54,044
	Interest expense		5,737		—		5,737
	Net interest income		48,307		—		48,307
	Provision for credit losses		849		—		849
	Net interest income after provision for credit losses		47,458		—		47,458
	Non-interest income		13,031		5,210		18,241
	Non-interest expense		37,367		2,937		40,304
	Income before provision for income taxes		23,122		2,273		25,395
	Provision for income taxes		5,611		909		6,520
	Net income	$	17,511	$	1,364	$	18,875
	For the Three Months ended June 30, 2013:
	Interest income	$	54,424	$	—	$	54,424
	Interest expense		8,435		—		8,435
	Net interest income		45,989		—		45,989
	Provision for credit losses		1,021		—		1,021
	Net interest income after provision for credit losses		44,968		—		44,968
	Non-interest income		12,901		4,823		17,724
	Non-interest expense		36,620		2,879		39,499
	Income before provision for income taxes		21,249		1,944		23,193
	Provision for income taxes		5,399		777		6,176
	Net income	$	15,850	$	1,167	$	17,017
	For the Six Months ended June 30, 2014:
	Interest income	$	107,501	$	—	$	107,501
	Interest expense		11,870		—		11,870
	Net interest income		95,631		—		95,631
	Provision for credit losses		3,048		—		3,048
	Net interest income after provision for credit losses		92,583		—		92,583
	Non-interest income		24,432		10,858		35,290
	Non-interest expense		74,193		6,205		80,398
	Income before provision for income taxes		42,822		4,653		47,475
	Provision for income taxes		10,318		1,861		12,179
	Net income	$	32,504	$	2,792	$	35,296
	For the Six Months ended June 30, 2013:
	Interest income	$	109,317	$	—	$	109,317
	Interest expense		17,199		—		17,199
	Net interest income		92,118		—		92,118
	Provision for credit losses		3,123		—		3,123
	Net interest income after provision for credit losses		88,995		—		88,995
	Non-interest income		25,380		9,840		35,220
	Non-interest expense		74,372		5,874		80,246
	Income before provision for income taxes		40,003		3,966		43,969
	Provision for income taxes		9,346		1,586		10,932
	Net income	$	30,657	$	2,380	$	33,037

Earnings_Per_Common_Share_Summ

Earnings Per Common Share - Summary of Earnings Per Common Share (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, except Share data, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Numerator for both basic and diluted earnings per common share:	'	'	'	'
Net income	$18,875	$17,017	$35,296	$33,037
Denominator:	'	'	'	'
Total average basic common shares outstanding	29,242,180	29,245,201	29,212,347	29,228,355
Effect of dilutive stock options and warrant	79,747	63,605	81,077	59,663
Total diluted average common shares outstanding	29,321,927	29,308,806	29,293,424	29,288,018
Earnings per common share - basic	$0.65	$0.58	$1.21	$1.13
Earnings per common share - diluted	$0.64	$0.58	$1.20	$1.13

Earnings_Per_Common_Share_Addi

Earnings Per Common Share - Additional Information (Detail) (Stock Option [Member])	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013
Stock Option [Member]	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]	'	'
Stock options excluded from computation of diluted earnings per share	179,335	180,969

Securities_Schedule_of_Fair_Va

Securities - Schedule of Fair Value and Amortized Cost of Available-for-sale and Held-to-maturity Securities (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule of Trading Securities and Other Trading Assets [Line Items]	'	'
Available-for-sale, Amortized Cost	$1,004,636	$944,074
Available-for-sale, Gross Unrealized Gains	11,750	8,999
Available-for-sale, Gross Unrealized Losses	-10,307	-18,687
Available-for-sale, Estimated Fair Value	1,006,079	934,386
Held-to-maturity, Amortized Cost	607,695	598,520
Held-to-maturity, Gross Unrealized Gains	24,637	12,962
Held-to-maturity, Gross Unrealized Losses	-3,792	-15,174
Held-to-maturity securities, Fair value	628,540	596,308
Total securities, Amortized Cost	1,612,331	1,542,594
Total securities, Gross Unrealized Gains	36,387	21,961
Total securities, Gross Unrealized Losses	-14,099	-33,861
Total securities, Estimated Fair Value	1,634,619	1,530,694
Residential Mortgage-Backed Securities and Collateralized Mortgage Obligations of Government Agencies [Member]	'	'
Schedule of Trading Securities and Other Trading Assets [Line Items]	'	'
Available-for-sale, Amortized Cost	772,918	707,000
Available-for-sale, Gross Unrealized Gains	4,114	3,191
Available-for-sale, Gross Unrealized Losses	-9,550	-15,924
Available-for-sale, Estimated Fair Value	767,482	694,267
Held-to-maturity, Amortized Cost	88,897	99,409
Held-to-maturity, Gross Unrealized Gains	3,705	2,804
Held-to-maturity, Gross Unrealized Losses	-501	-1,023
Held-to-maturity securities, Fair value	92,101	101,190
Total securities, Gross Unrealized Losses	-10,051	-16,947
Obligations of State and Political Subdivisions [Member]	'	'
Schedule of Trading Securities and Other Trading Assets [Line Items]	'	'
Available-for-sale, Amortized Cost	104,553	112,536
Available-for-sale, Gross Unrealized Gains	5,700	4,165
Available-for-sale, Gross Unrealized Losses	-14	-355
Available-for-sale, Estimated Fair Value	110,239	116,346
Held-to-maturity, Amortized Cost	513,058	496,396
Held-to-maturity, Gross Unrealized Gains	20,866	10,158
Held-to-maturity, Gross Unrealized Losses	-3,206	-13,906
Held-to-maturity securities, Fair value	530,718	492,648
Total securities, Gross Unrealized Losses	-3,220	-14,261
Corporate Debt Securities [Member]	'	'
Schedule of Trading Securities and Other Trading Assets [Line Items]	'	'
Available-for-sale, Amortized Cost	36,731	38,777
Available-for-sale, Gross Unrealized Gains	260	174
Available-for-sale, Gross Unrealized Losses	-99	-470
Available-for-sale, Estimated Fair Value	36,892	38,481
Held-to-maturity, Amortized Cost	5,740	2,715
Held-to-maturity, Gross Unrealized Gains	66	'
Held-to-maturity, Gross Unrealized Losses	-85	-245
Held-to-maturity securities, Fair value	5,721	2,470
Total securities, Gross Unrealized Losses	-184	-715
Obligations of Government Agencies [Member]	'	'
Schedule of Trading Securities and Other Trading Assets [Line Items]	'	'
Available-for-sale, Amortized Cost	79,164	75,164
Available-for-sale, Gross Unrealized Gains	382	6
Available-for-sale, Gross Unrealized Losses	-644	-1,938
Available-for-sale, Estimated Fair Value	78,902	73,232
Total securities, Gross Unrealized Losses	-644	-1,938
Debt Securities [Member]	'	'
Schedule of Trading Securities and Other Trading Assets [Line Items]	'	'
Available-for-sale, Amortized Cost	993,366	933,477
Available-for-sale, Gross Unrealized Gains	10,456	7,536
Available-for-sale, Gross Unrealized Losses	-10,307	-18,687
Available-for-sale, Estimated Fair Value	993,515	922,326
Equity Securities [Member]	'	'
Schedule of Trading Securities and Other Trading Assets [Line Items]	'	'
Available-for-sale, Amortized Cost	11,270	10,597
Available-for-sale, Gross Unrealized Gains	1,294	1,463
Available-for-sale, Estimated Fair Value	$12,564	$12,060

Securities_Additional_Informat

Securities - Additional Information (Detail) (USD $)	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Dec. 31, 2012
	Holdings		Holdings
Amortized Cost And Fair Value Debt Securities [Abstract]	'	'	'	'
Maximum percentage of equity of one issuer	10.00%	'	'	'
Number of holdings greater than specified percentage of equity	0	'	0	'
Securities with aggregate fair values	$707,500,000	'	$701,700,000	'
Proceeds from sale of available-for-sale securities	3,491,000	9,265,000	'	'
Net unrealized gains (losses) on available-for-sale securities included in AOCI	911,000	1,424,000	-6,126,000	13,032,000
Impaired loss relating to securities	0	'	'	'
Federal home loan bank stock, Total	$15,000,000	'	$11,600,000	'

Securities_Schedule_of_Fair_Va1

Securities - Schedule of Fair Value of Available-for-Sale and Held-to-Maturity Securities by Contractual Maturity (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule Of Available For Sale Or Held To Maturity Securities [Line Items]	'	'
Total available-for-sale securities, One Year or less	$11,403	'
Total available-for-sale securities, One to Five Years	69,029	'
Total available-for-sale securities, Five to Ten Years	59,782	'
Total available-for-sale securities, After Ten Years	85,819	'
Total available-for-sale securities, Mortgage-backed and Equity	780,046	'
Available-for-sale, Estimated Fair Value	1,006,079	934,386
Total held-to-maturity securities, One Year or less	4,743	'
Total held-to-maturity securities, One to Five Years	12,390	'
Total held-to-maturity securities, Five to Ten years	184,698	'
Total held-to-maturity securities, After Ten Years	334,608	'
Total held-to-maturity securities, Mortgage-backed and Equity	92,101	'
Held-to-maturity securities, Fair value	628,540	596,308
Total securities, One Year or less	16,146	'
Total securities, One to Five Years	81,419	'
Total securities, Five to Ten Years	244,480	'
Total securities, After Ten Years, Fair value	420,427	'
Total securities, Mortgage- backed and Equity	872,147	'
Total securities, Fair value	1,634,619	'
Obligations of Government Agencies [Member]	'	'
Schedule Of Available For Sale Or Held To Maturity Securities [Line Items]	'	'
Total available-for-sale securities, One Year or less	313	'
Total available-for-sale securities, One to Five Years	9,833	'
Total available-for-sale securities, Five to Ten Years	26,123	'
Total available-for-sale securities, After Ten Years	42,633	'
Available-for-sale, Estimated Fair Value	78,902	73,232
Residential Mortgage-Backed Securities and Collateralized Mortgage Obligations of Government Agencies [Member]	'	'
Schedule Of Available For Sale Or Held To Maturity Securities [Line Items]	'	'
Total available-for-sale securities, Mortgage-backed and Equity	767,482	'
Available-for-sale, Estimated Fair Value	767,482	694,267
Total held-to-maturity securities, Mortgage-backed and Equity	92,101	'
Held-to-maturity securities, Fair value	92,101	101,190
Obligations of State and Political Subdivisions [Member]	'	'
Schedule Of Available For Sale Or Held To Maturity Securities [Line Items]	'	'
Total available-for-sale securities, One Year or less	7,072	'
Total available-for-sale securities, One to Five Years	43,257	'
Total available-for-sale securities, Five to Ten Years	21,615	'
Total available-for-sale securities, After Ten Years	38,295	'
Available-for-sale, Estimated Fair Value	110,239	116,346
Total held-to-maturity securities, One Year or less	4,743	'
Total held-to-maturity securities, One to Five Years	12,390	'
Total held-to-maturity securities, Five to Ten years	178,977	'
Total held-to-maturity securities, After Ten Years	334,608	'
Held-to-maturity securities, Fair value	530,718	492,648
Corporate Debt Securities [Member]	'	'
Schedule Of Available For Sale Or Held To Maturity Securities [Line Items]	'	'
Total available-for-sale securities, One Year or less	4,018	'
Total available-for-sale securities, One to Five Years	15,939	'
Total available-for-sale securities, Five to Ten Years	12,044	'
Total available-for-sale securities, After Ten Years	4,891	'
Available-for-sale, Estimated Fair Value	36,892	38,481
Total held-to-maturity securities, Five to Ten years	5,721	'
Held-to-maturity securities, Fair value	5,721	2,470
Equity Securities [Member]	'	'
Schedule Of Available For Sale Or Held To Maturity Securities [Line Items]	'	'
Total available-for-sale securities, Mortgage-backed and Equity	12,564	'
Available-for-sale, Estimated Fair Value	$12,564	$12,060

Securities_Schedule_of_Fair_Va2

Securities - Schedule of Fair Value of Available-for-Sale and Held-to-Maturity Securities by Contractual Maturity (Parenthetical) (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Amortized Cost And Fair Value Debt Securities [Abstract]	'	'
Held-to-maturity, Amortized Cost	$607,695	$598,520

Securities_Schedule_of_Unreali

Securities - Schedule of Unrealized Losses on Investment Securities (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]	'	'
Unrealized Losses, Total	($14,099)	($33,861)
Obligations of Government Agencies [Member]	'	'
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]	'	'
Less than 12 months, Fair Value	18,919	54,356
Less than 12 months, Unrealized Losses	-124	-1,911
Less than 12 months, Number of Securities	5	15
12 months or more, Fair Value	19,790	5,083
12 months or more, Unrealized Losses	-520	-27
12 months or more, Number of Securities	5	2
Fair Value, Total	38,709	59,439
Unrealized Losses, Total	-644	-1,938
Number of Securities Total	10	17
Residential Mortgage-Backed Securities and Collateralized Mortgage Obligations of Government Agencies [Member]	'	'
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]	'	'
Less than 12 months, Fair Value	191,506	513,495
Less than 12 months, Unrealized Losses	-1,380	-14,639
Less than 12 months, Number of Securities	37	89
12 months or more, Fair Value	239,724	37,002
12 months or more, Unrealized Losses	-8,671	-2,308
12 months or more, Number of Securities	42	11
Fair Value, Total	431,230	550,497
Unrealized Losses, Total	-10,051	-16,947
Number of Securities Total	79	100
Obligations of State and Political Subdivisions [Member]	'	'
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]	'	'
Less than 12 months, Fair Value	20,790	181,667
Less than 12 months, Unrealized Losses	-107	-10,830
Less than 12 months, Number of Securities	34	277
12 months or more, Fair Value	115,199	47,793
12 months or more, Unrealized Losses	-3,113	-3,431
12 months or more, Number of Securities	177	76
Fair Value, Total	135,989	229,460
Unrealized Losses, Total	-3,220	-14,261
Number of Securities Total	211	353
Corporate Debt Securities [Member]	'	'
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]	'	'
Less than 12 months, Fair Value	4,996	19,837
Less than 12 months, Unrealized Losses	-4	-560
Less than 12 months, Number of Securities	1	7
12 months or more, Fair Value	4,525	2,845
12 months or more, Unrealized Losses	-180	-155
12 months or more, Number of Securities	2	1
Fair Value, Total	9,521	22,682
Unrealized Losses, Total	-184	-715
Number of Securities Total	3	8
Total Temporarily Impaired Securities [Member]	'	'
Schedule Of Available For Sale Securities And Held To Maturity Securities [Line Items]	'	'
Less than 12 months, Fair Value	236,211	769,355
Less than 12 months, Unrealized Losses	-1,615	-27,940
Less than 12 months, Number of Securities	77	388
12 months or more, Fair Value	379,238	92,723
12 months or more, Unrealized Losses	-12,484	-5,921
12 months or more, Number of Securities	226	90
Fair Value, Total	615,449	862,078
Unrealized Losses, Total	($14,099)	($33,861)
Number of Securities Total	303	478

Loans_and_the_Allowance_for_Cr2

Loans and the Allowance for Credit Losses - Additional Information (Detail) (USD $)	6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
	Contract
	SecurityLoan
Financing Receivable, Recorded Investment [Line Items]	'	'
Deferred loan fees and costs	$2.80	$2.70
Non-accrual status period	'90 days	'
Number of restructured contracts greater than $1 million	0	'
Accruing and non accrual TDR permitted interest only payment period	'3 months	'
Percentage of TDRs defaulted during the period that were restructured within the last twelve months	1.20%	'
Loans with accruing interest	0	'
Substandard [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Aggregate amount of residential real estate, home equity and consumer loans classified as substandard	14.7	14.4
Internally assigned loan grades to residential real estate, home equity and consumer loans	$2.70	$2

Loans_and_the_Allowance_for_Cr3

Loans and the Allowance for Credit Losses - Schedule of Recorded Investment in Loans by Category (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment [Line Items]	'	'
Total portfolio loans	$3,946,118	$3,894,917
Loans held for sale	10,641	5,855
Total loans	3,956,759	3,900,772
Commercial Real Estate - Land and Construction [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total portfolio loans	255,499	263,117
Commercial Real Estate - Improved Property [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total portfolio loans	1,685,373	1,649,802
Commercial Real Estate [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total portfolio loans	1,940,872	1,912,919
Commercial and Industrial [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total portfolio loans	578,665	556,249
Residential Real Estate [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total portfolio loans	898,357	890,804
Home Equity [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total portfolio loans	295,127	284,687
Consumer [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total portfolio loans	$233,097	$250,258

Loans_and_the_Allowance_for_Cr4

Loans and the Allowance for Credit Losses - Summary of Changes in Allowance for Credit Losses (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'
Allowance for loan losses, beginning balance	'	'	$47,368	$52,699
Allowance for loan commitments, beginning balance	'	'	602	341
Total beginning allowance for credit losses	'	'	47,970	53,040
Provision for loan losses	'	'	3,114	3,147
Provision for loan commitments	'	'	-66	-24
Total provision for credit losses	849	1,021	3,048	3,123
Charge-offs	'	'	-6,639	-7,063
Recoveries	'	'	1,898	1,598
Net charge-offs	'	'	-4,741	-5,465
Allowance for loan losses, ending balance	45,741	50,381	45,741	50,381
Allowance for loan commitments, ending balance	536	317	536	317
Total ending allowance for credit losses	46,277	50,698	46,277	50,698
Commercial Real Estate - Land and Construction [Member]	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'
Allowance for loan losses, beginning balance	'	'	6,056	3,741
Allowance for loan commitments, beginning balance	'	'	301	27
Total beginning allowance for credit losses	'	'	6,357	3,768
Provision for loan losses	'	'	-405	559
Provision for loan commitments	'	'	-20	11
Total provision for credit losses	'	'	-425	570
Charge-offs	'	'	'	-373
Recoveries	'	'	'	10
Net charge-offs	'	'	'	-363
Allowance for loan losses, ending balance	5,651	3,937	5,651	3,937
Allowance for loan commitments, ending balance	281	38	281	38
Total ending allowance for credit losses	5,932	3,975	5,932	3,975
Commercial Real Estate - Improved Property [Member]	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'
Allowance for loan losses, beginning balance	'	'	18,157	23,614
Allowance for loan commitments, beginning balance	'	'	62	25
Total beginning allowance for credit losses	'	'	18,219	23,639
Provision for loan losses	'	'	-511	1,855
Provision for loan commitments	'	'	-52	-2
Total provision for credit losses	'	'	-563	1,853
Charge-offs	'	'	-728	-1,395
Recoveries	'	'	390	420
Net charge-offs	'	'	-338	-975
Allowance for loan losses, ending balance	17,308	24,494	17,308	24,494
Allowance for loan commitments, ending balance	10	23	10	23
Total ending allowance for credit losses	17,318	24,517	17,318	24,517
Commercial and Industrial [Member]	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'
Allowance for loan losses, beginning balance	'	'	9,925	9,326
Allowance for loan commitments, beginning balance	'	'	130	215
Total beginning allowance for credit losses	'	'	10,055	9,541
Provision for loan losses	'	'	1,870	-208
Provision for loan commitments	'	'	1	-77
Total provision for credit losses	'	'	1,871	-285
Charge-offs	'	'	-2,384	-919
Recoveries	'	'	543	273
Net charge-offs	'	'	-1,841	-646
Allowance for loan losses, ending balance	9,954	8,472	9,954	8,472
Allowance for loan commitments, ending balance	131	138	131	138
Total ending allowance for credit losses	10,085	8,610	10,085	8,610
Residential Real Estate [Member]	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'
Allowance for loan losses, beginning balance	'	'	5,673	7,182
Allowance for loan commitments, beginning balance	'	'	5	6
Total beginning allowance for credit losses	'	'	5,678	7,188
Provision for loan losses	'	'	575	87
Total provision for credit losses	'	'	575	87
Charge-offs	'	'	-1,207	-1,573
Recoveries	'	'	248	113
Net charge-offs	'	'	-959	-1,460
Allowance for loan losses, ending balance	5,289	5,809	5,289	5,809
Allowance for loan commitments, ending balance	5	6	5	6
Total ending allowance for credit losses	5,294	5,815	5,294	5,815
Home Equity [Member]	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'
Allowance for loan losses, beginning balance	'	'	2,017	2,458
Allowance for loan commitments, beginning balance	'	'	85	49
Total beginning allowance for credit losses	'	'	2,102	2,507
Provision for loan losses	'	'	392	-32
Provision for loan commitments	'	'	5	44
Total provision for credit losses	'	'	397	12
Charge-offs	'	'	-348	-346
Recoveries	'	'	71	43
Net charge-offs	'	'	-277	-303
Allowance for loan losses, ending balance	2,132	2,123	2,132	2,123
Allowance for loan commitments, ending balance	90	93	90	93
Total ending allowance for credit losses	2,222	2,216	2,222	2,216
Consumer [Member]	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'
Allowance for loan losses, beginning balance	'	'	5,020	5,557
Allowance for loan commitments, beginning balance	'	'	19	19
Total beginning allowance for credit losses	'	'	5,039	5,576
Provision for loan losses	'	'	642	836
Total provision for credit losses	'	'	642	836
Charge-offs	'	'	-1,610	-2,043
Recoveries	'	'	512	607
Net charge-offs	'	'	-1,098	-1,436
Allowance for loan losses, ending balance	4,564	4,957	4,564	4,957
Allowance for loan commitments, ending balance	19	19	19	19
Total ending allowance for credit losses	4,583	4,976	4,583	4,976
Deposit Overdraft [Member]	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'
Allowance for loan losses, beginning balance	'	'	520	821
Total beginning allowance for credit losses	'	'	520	821
Provision for loan losses	'	'	551	50
Total provision for credit losses	'	'	551	50
Charge-offs	'	'	-362	-414
Recoveries	'	'	134	132
Net charge-offs	'	'	-228	-282
Allowance for loan losses, ending balance	843	589	843	589
Total ending allowance for credit losses	$843	$589	$843	$589

Loans_and_the_Allowance_for_Cr5

Loans and the Allowance for Credit Losses - Allowance for Credit Losses and Recorded Investment in Loans (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'
Allowance for loans individually evaluated for impairment	$1,068	$732	'	'
Allowance for loans collectively evaluated for impairment	44,673	46,636	'	'
Allowance for loan commitments	536	602	317	341
Total allowance for credit losses	46,277	47,970	50,698	53,040
Individually evaluated for impairment	7,348	6,075	'	'
Collectively evaluated for impairment	3,938,770	3,888,842	'	'
Total Loans	3,946,118	3,894,917	'	'
Commercial Real Estate - Land and Construction [Member]	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'
Allowance for loans collectively evaluated for impairment	5,651	6,056	'	'
Allowance for loan commitments	281	301	38	27
Total allowance for credit losses	5,932	6,357	3,975	3,768
Collectively evaluated for impairment	255,499	263,117	'	'
Total Loans	255,499	263,117	'	'
Commercial Real Estate - Improved Property [Member]	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'
Allowance for loans individually evaluated for impairment	39	51	'	'
Allowance for loans collectively evaluated for impairment	17,269	18,106	'	'
Allowance for loan commitments	10	62	23	25
Total allowance for credit losses	17,318	18,219	24,517	23,639
Individually evaluated for impairment	4,264	4,321	'	'
Collectively evaluated for impairment	1,681,109	1,645,481	'	'
Total Loans	1,685,373	1,649,802	'	'
Commercial and Industrial [Member]	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'
Allowance for loans individually evaluated for impairment	1,029	681	'	'
Allowance for loans collectively evaluated for impairment	8,925	9,244	'	'
Allowance for loan commitments	131	130	138	215
Total allowance for credit losses	10,085	10,055	8,610	9,541
Individually evaluated for impairment	3,084	1,754	'	'
Collectively evaluated for impairment	575,581	554,495	'	'
Total Loans	578,665	556,249	'	'
Residential Real Estate [Member]	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'
Allowance for loans collectively evaluated for impairment	5,289	5,673	'	'
Allowance for loan commitments	5	5	6	6
Total allowance for credit losses	5,294	5,678	5,815	7,188
Collectively evaluated for impairment	898,357	890,804	'	'
Total Loans	898,357	890,804	'	'
Home Equity [Member]	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'
Allowance for loans collectively evaluated for impairment	2,132	2,017	'	'
Allowance for loan commitments	90	85	93	49
Total allowance for credit losses	2,222	2,102	2,216	2,507
Collectively evaluated for impairment	295,127	284,687	'	'
Total Loans	295,127	284,687	'	'
Consumer [Member]	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'
Allowance for loans collectively evaluated for impairment	4,564	5,020	'	'
Allowance for loan commitments	19	19	19	19
Total allowance for credit losses	4,583	5,039	4,976	5,576
Collectively evaluated for impairment	233,097	250,258	'	'
Total Loans	233,097	250,258	'	'
Deposit Overdraft [Member]	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'
Allowance for loans collectively evaluated for impairment	843	520	'	'
Total allowance for credit losses	$843	$520	$589	$821

Loans_and_the_Allowance_for_Cr6

Loans and the Allowance for Credit Losses - Allowance for Credit Losses and Recorded Investment in Loans (Parenthetical) (Detail) (USD $)	6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014
Receivables [Abstract]	'
Trouble debt restructuring threshold	$1

Loans_and_the_Allowance_for_Cr7

Loans and the Allowance for Credit Losses - Summary of Commercial Loans by Risk Grade (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Summary of commercial loans by risk grade	'	'
Commercial loans	$2,519,537	$2,469,168
Excellent - Minimal Risk [Member]	'	'
Summary of commercial loans by risk grade	'	'
Commercial loans	72,513	73,749
Good - Desirable Risk [Member]	'	'
Summary of commercial loans by risk grade	'	'
Commercial loans	933,135	946,815
Fair - Acceptable Risk [Member]	'	'
Summary of commercial loans by risk grade	'	'
Commercial loans	1,392,422	1,313,020
Criticized - Marginal [Member]	'	'
Summary of commercial loans by risk grade	'	'
Commercial loans	68,707	75,249
Classified - Substandard [Member]	'	'
Summary of commercial loans by risk grade	'	'
Commercial loans	52,760	60,335
Commercial Real Estate - Land and Construction [Member]	'	'
Summary of commercial loans by risk grade	'	'
Commercial loans	255,499	263,117
Commercial Real Estate - Land and Construction [Member] | Good - Desirable Risk [Member]	'	'
Summary of commercial loans by risk grade	'	'
Commercial loans	23,884	39,409
Commercial Real Estate - Land and Construction [Member] | Fair - Acceptable Risk [Member]	'	'
Summary of commercial loans by risk grade	'	'
Commercial loans	222,915	213,822
Commercial Real Estate - Land and Construction [Member] | Criticized - Marginal [Member]	'	'
Summary of commercial loans by risk grade	'	'
Commercial loans	6,282	6,498
Commercial Real Estate - Land and Construction [Member] | Classified - Substandard [Member]	'	'
Summary of commercial loans by risk grade	'	'
Commercial loans	2,418	3,388
Commercial Real Estate - Improved Property [Member]	'	'
Summary of commercial loans by risk grade	'	'
Commercial loans	1,685,373	1,649,802
Commercial Real Estate - Improved Property [Member] | Excellent - Minimal Risk [Member]	'	'
Summary of commercial loans by risk grade	'	'
Commercial loans	352	360
Commercial Real Estate - Improved Property [Member] | Good - Desirable Risk [Member]	'	'
Summary of commercial loans by risk grade	'	'
Commercial loans	707,407	710,137
Commercial Real Estate - Improved Property [Member] | Fair - Acceptable Risk [Member]	'	'
Summary of commercial loans by risk grade	'	'
Commercial loans	885,735	838,283
Commercial Real Estate - Improved Property [Member] | Criticized - Marginal [Member]	'	'
Summary of commercial loans by risk grade	'	'
Commercial loans	50,934	57,983
Commercial Real Estate - Improved Property [Member] | Classified - Substandard [Member]	'	'
Summary of commercial loans by risk grade	'	'
Commercial loans	40,945	43,039
Commercial and Industrial [Member]	'	'
Summary of commercial loans by risk grade	'	'
Commercial loans	578,665	556,249
Commercial and Industrial [Member] | Excellent - Minimal Risk [Member]	'	'
Summary of commercial loans by risk grade	'	'
Commercial loans	72,161	73,389
Commercial and Industrial [Member] | Good - Desirable Risk [Member]	'	'
Summary of commercial loans by risk grade	'	'
Commercial loans	201,844	197,269
Commercial and Industrial [Member] | Fair - Acceptable Risk [Member]	'	'
Summary of commercial loans by risk grade	'	'
Commercial loans	283,772	260,915
Commercial and Industrial [Member] | Criticized - Marginal [Member]	'	'
Summary of commercial loans by risk grade	'	'
Commercial loans	11,491	10,768
Commercial and Industrial [Member] | Classified - Substandard [Member]	'	'
Summary of commercial loans by risk grade	'	'
Commercial loans	$9,397	$13,908

Loans_and_the_Allowance_for_Cr8

Loans and the Allowance for Credit Losses - Summary of Age Analysis of Loan Categories (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment [Line Items]	'	'
Current	$3,902,856	$3,848,624
30-59 Days Past Due	8,390	10,041
60-89 Days Past Due	5,084	9,152
90 Days or More Past Due	29,788	27,100
Total Past Due	43,262	46,293
Total Loans	3,946,118	3,894,917
90 Days or More Past Due and Accruing	2,947	2,591
Loans held for sale	10,641	5,855
Total loans, current	3,913,497	3,854,479
Total loans	3,956,759	3,900,772
Loans Held for Sale [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
30-59 Days Past Due	'	'
60-89 Days Past Due	'	'
90 Days or More Past Due	'	'
Total Past Due	'	'
90 Days or More Past Due and Accruing	'	'
Loans held for sale, Current	10,641	5,855
Loans held for sale	10,641	5,855
Commercial Real Estate - Land and Construction [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Current	253,610	261,165
30-59 Days Past Due	290	2
60-89 Days Past Due	1	'
90 Days or More Past Due	1,598	1,950
Total Past Due	1,889	1,952
Total Loans	255,499	263,117
90 Days or More Past Due and Accruing	248	248
Commercial Real Estate - Improved Property [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Current	1,669,880	1,632,973
30-59 Days Past Due	456	2,482
60-89 Days Past Due	967	2,346
90 Days or More Past Due	14,070	12,001
Total Past Due	15,493	16,829
Total Loans	1,685,373	1,649,802
90 Days or More Past Due and Accruing	'	318
Commercial Real Estate [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Current	1,923,490	1,894,138
30-59 Days Past Due	746	2,484
60-89 Days Past Due	968	2,346
90 Days or More Past Due	15,668	13,951
Total Past Due	17,382	18,781
Total Loans	1,940,872	1,912,919
90 Days or More Past Due and Accruing	248	566
Commercial and Industrial [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Current	574,121	552,414
30-59 Days Past Due	1,594	1,112
60-89 Days Past Due	229	977
90 Days or More Past Due	2,721	1,746
Total Past Due	4,544	3,835
Total Loans	578,665	556,249
90 Days or More Past Due and Accruing	6	'
Residential Real Estate [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Current	884,456	875,192
30-59 Days Past Due	1,554	1,641
60-89 Days Past Due	2,692	4,710
90 Days or More Past Due	9,655	9,261
Total Past Due	13,901	15,612
Total Loans	898,357	890,804
90 Days or More Past Due and Accruing	1,843	1,289
Home Equity [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Current	291,075	281,004
30-59 Days Past Due	2,004	1,581
60-89 Days Past Due	666	470
90 Days or More Past Due	1,382	1,632
Total Past Due	4,052	3,683
Total Loans	295,127	284,687
90 Days or More Past Due and Accruing	628	411
Consumer [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Current	229,714	245,876
30-59 Days Past Due	2,492	3,223
60-89 Days Past Due	529	649
90 Days or More Past Due	362	510
Total Past Due	3,383	4,382
Total Loans	233,097	250,258
90 Days or More Past Due and Accruing	222	325
Non-Accrual Loans [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Current	6,636	9,028
30-59 Days Past Due	1,694	588
60-89 Days Past Due	1,060	2,722
90 Days or More Past Due	26,728	24,295
Total Past Due	29,482	27,605
Total Loans	36,118	36,633
TDRs Accruing Interest [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Current	12,818	13,595
30-59 Days Past Due	167	171
60-89 Days Past Due	415	881
90 Days or More Past Due	113	214
Total Past Due	695	1,266
Total Loans	13,513	14,861
Total Impaired [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Current	19,454	22,623
30-59 Days Past Due	1,861	759
60-89 Days Past Due	1,475	3,603
90 Days or More Past Due	26,841	24,509
Total Past Due	30,177	28,871
Total Loans	$49,631	$51,494

Loans_and_the_Allowance_for_Cr9

Loans and the Allowance for Credit Losses - Summary of Age Analysis of Loan Categories (Parenthetical) (Detail)	6 Months Ended
	Jun. 30, 2014
Receivables [Abstract]	'
Past due loans excluded TDRs past due and accruing	'90 days

Recovered_Sheet1

Loans and the Allowance for Credit Losses - Summary of Impaired Loans (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Financing Receivable, Impaired [Line Items]	'	'	'	'	'
Unpaid Principal Balance	$53,823	'	$53,823	'	$56,215
Recorded Investment	49,631	'	49,631	'	51,494
Related Allowance	1,068	'	1,068	'	732
Average Recorded Investment	50,273	62,743	50,677	63,046	'
Interest Income Recognized	478	484	774	972	'
Impaired Loans with No Related Specific Allowance Recorded [Member]	'	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'	'
Unpaid Principal Balance	51,137	'	51,137	'	53,940
Recorded Investment	46,945	'	46,945	'	49,219
Average Recorded Investment	47,009	57,035	47,744	57,371	'
Interest Income Recognized	446	458	729	918	'
Impaired Loans with No Related Specific Allowance Recorded [Member] | Commercial Real Estate - Land and Construction [Member]	'	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'	'
Unpaid Principal Balance	2,050	'	2,050	'	2,663
Recorded Investment	1,950	'	1,950	'	2,564
Average Recorded Investment	2,143	5,704	2,283	5,661	'
Interest Income Recognized	13	37	15	97	'
Impaired Loans with No Related Specific Allowance Recorded [Member] | Commercial Real Estate - Improved Property [Member]	'	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'	'
Unpaid Principal Balance	19,719	'	19,719	'	21,421
Recorded Investment	18,455	'	18,455	'	19,628
Average Recorded Investment	18,572	24,428	18,924	24,437	'
Interest Income Recognized	133	185	153	316	'
Impaired Loans with No Related Specific Allowance Recorded [Member] | Commercial and Industrial [Member]	'	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'	'
Unpaid Principal Balance	4,970	'	4,970	'	3,773
Recorded Investment	4,428	'	4,428	'	3,249
Average Recorded Investment	4,122	3,974	3,831	3,989	'
Interest Income Recognized	57	28	89	61	'
Impaired Loans with No Related Specific Allowance Recorded [Member] | Residential Real Estate [Member]	'	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'	'
Unpaid Principal Balance	20,726	'	20,726	'	22,006
Recorded Investment	18,891	'	18,891	'	20,090
Average Recorded Investment	18,864	19,462	19,272	19,731	'
Interest Income Recognized	209	171	391	365	'
Impaired Loans with No Related Specific Allowance Recorded [Member] | Home Equity [Member]	'	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'	'
Unpaid Principal Balance	2,355	'	2,355	'	2,675
Recorded Investment	2,118	'	2,118	'	2,506
Average Recorded Investment	2,173	2,034	2,284	2,092	'
Interest Income Recognized	16	15	35	30	'
Impaired Loans with No Related Specific Allowance Recorded [Member] | Consumer [Member]	'	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'	'
Unpaid Principal Balance	1,317	'	1,317	'	1,402
Recorded Investment	1,103	'	1,103	'	1,182
Average Recorded Investment	1,135	1,433	1,150	1,461	'
Interest Income Recognized	18	22	46	49	'
Impaired Loans with a Specific Allowance Recorded [Member]	'	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'	'
Unpaid Principal Balance	2,686	'	2,686	'	2,275
Recorded Investment	2,686	'	2,686	'	2,275
Related Allowance	1,068	'	1,068	'	732
Average Recorded Investment	3,264	5,708	2,933	5,675	'
Interest Income Recognized	32	26	45	54	'
Impaired Loans with a Specific Allowance Recorded [Member] | Commercial Real Estate - Land and Construction [Member]	'	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'	'
Average Recorded Investment	'	1,540	'	1,569	'
Interest Income Recognized	'	9	'	22	'
Impaired Loans with a Specific Allowance Recorded [Member] | Commercial Real Estate - Improved Property [Member]	'	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'	'
Unpaid Principal Balance	725	'	725	'	729
Recorded Investment	725	'	725	'	729
Related Allowance	39	'	39	'	51
Average Recorded Investment	727	4,168	727	4,106	'
Interest Income Recognized	3	17	4	32	'
Impaired Loans with a Specific Allowance Recorded [Member] | Commercial and Industrial [Member]	'	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'	'
Unpaid Principal Balance	1,961	'	1,961	'	1,546
Recorded Investment	1,961	'	1,961	'	1,546
Related Allowance	1,029	'	1,029	'	681
Average Recorded Investment	2,537	'	2,206	'	'
Interest Income Recognized	$29	'	$41	'	'

Recovered_Sheet2

Loans and the Allowance for Credit Losses - Recorded Investment in Non-Accrual Loans and TDRs (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financing Receivable, Impaired [Line Items]	'	'
Non-accrual loans	$36,118	$36,633
TDRs	19,794	24,185
Accruing TDRs [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
TDRs	13,513	14,861
Non-Accrual TDRs [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
TDRs	6,281	9,324
Commercial Real Estate - Land and Construction [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
Non-accrual loans	1,950	2,564
TDRs	1,008	1,601
Commercial Real Estate - Land and Construction [Member] | Non-Accrual TDRs [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
TDRs	1,008	1,601
Commercial Real Estate - Improved Property [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
Non-accrual loans	15,946	17,305
TDRs	5,178	6,710
Commercial Real Estate - Improved Property [Member] | Accruing TDRs [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
TDRs	3,234	3,052
Commercial Real Estate - Improved Property [Member] | Non-Accrual TDRs [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
TDRs	1,944	3,658
Commercial Real Estate [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
Non-accrual loans	17,896	19,869
TDRs	6,186	8,311
Commercial Real Estate [Member] | Accruing TDRs [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
TDRs	3,234	3,052
Commercial Real Estate [Member] | Non-Accrual TDRs [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
TDRs	2,952	5,259
Commercial and Industrial [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
Non-accrual loans	6,167	4,380
TDRs	625	994
Commercial and Industrial [Member] | Accruing TDRs [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
TDRs	222	415
Commercial and Industrial [Member] | Non-Accrual TDRs [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
TDRs	403	579
Residential Real Estate [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
Non-accrual loans	10,137	10,240
TDRs	11,168	12,841
Residential Real Estate [Member] | Accruing TDRs [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
TDRs	8,754	9,850
Residential Real Estate [Member] | Non-Accrual TDRs [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
TDRs	2,414	2,991
Home Equity [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
Non-accrual loans	1,283	1,604
TDRs	1,052	1,191
Home Equity [Member] | Accruing TDRs [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
TDRs	835	902
Home Equity [Member] | Non-Accrual TDRs [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
TDRs	217	289
Consumer [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
Non-accrual loans	635	540
TDRs	763	848
Consumer [Member] | Accruing TDRs [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
TDRs	468	642
Consumer [Member] | Non-Accrual TDRs [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
TDRs	$295	$206

Recovered_Sheet3

Loans and the Allowance for Credit Losses - Loans Identified as TDRs (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
	Contract	Contract	Contract	Contract
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of Modifications	12	16	18	40
Pre-Modification Outstanding Recorded Investment	$282	$842	$530	$3,441
Post-Modification Outstanding Recorded Investment	275	840	509	3,191
Commercial Real Estate - Land and Construction [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of Modifications	'	'	'	1
Pre-Modification Outstanding Recorded Investment	'	'	'	299
Post-Modification Outstanding Recorded Investment	'	'	'	295
Commercial Real Estate - Improved Property [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of Modifications	1	3	2	8
Pre-Modification Outstanding Recorded Investment	112	120	203	1,011
Post-Modification Outstanding Recorded Investment	112	120	201	836
Commercial Real Estate [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of Modifications	1	3	2	9
Pre-Modification Outstanding Recorded Investment	112	120	203	1,310
Post-Modification Outstanding Recorded Investment	112	120	201	1,131
Commercial and Industrial [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of Modifications	'	'	'	6
Pre-Modification Outstanding Recorded Investment	'	'	'	161
Post-Modification Outstanding Recorded Investment	'	'	'	161
Residential Real Estate [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of Modifications	2	9	5	16
Pre-Modification Outstanding Recorded Investment	70	673	189	1,883
Post-Modification Outstanding Recorded Investment	70	672	185	1,819
Home Equity [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of Modifications	'	1	'	1
Pre-Modification Outstanding Recorded Investment	'	13	'	14
Post-Modification Outstanding Recorded Investment	'	13	'	13
Consumer [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of Modifications	9	3	11	8
Pre-Modification Outstanding Recorded Investment	100	36	138	73
Post-Modification Outstanding Recorded Investment	$93	$35	$123	$67

Recovered_Sheet4

Loans and the Allowance for Credit Losses - TDRs Defaulted Later Restructured (Detail) (USD $)	3 Months Ended	6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
	Defaults	Defaults	Defaults
Financing Receivable, Modifications [Line Items]	'	'	'
Number of Defaults	6	4	31
Recorded Investment	$333	$236	$2,748
Commercial Real Estate - Improved Property [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of Defaults	'	'	2
Recorded Investment	'	'	645
Commercial Real Estate [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of Defaults	'	'	2
Recorded Investment	'	'	645
Commercial and Industrial [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of Defaults	'	'	3
Recorded Investment	'	'	313
Residential Real Estate [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of Defaults	5	4	19
Recorded Investment	312	236	1,634
Home Equity [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of Defaults	1	'	6
Recorded Investment	21	'	124
Consumer [Member]	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'
Number of Defaults	'	'	1
Recorded Investment	'	'	$32

Recovered_Sheet5

Loans and the Allowance for Credit Losses - Summary of Other Real Estate Owned and Repossessed Assets (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Receivables [Abstract]	'	'
Other real estate owned	$4,923	$4,689
Repossessed assets	183	171
Total other real estate owned and repossessed assets	$5,106	$4,860

Pension_Plan_Components_of_Net

Pension Plan - Components of Net Periodic Pension Cost (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Compensation And Retirement Disclosure [Abstract]	'	'	'	'
Service cost - benefits earned during year	$725	$698	$1,442	$1,655
Interest cost on projected benefit obligation	1,183	982	2,353	2,078
Expected return on plan assets	-1,802	-1,437	-3,585	-3,040
Amortization of prior service cost	11	11	22	23
Amortization of net loss	367	897	730	1,720
Net periodic pension cost	$484	$1,151	$962	$2,436

Pension_Plan_Additional_Inform

Pension Plan - Additional Information (Detail) (USD $)	6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014
Compensation And Retirement Disclosure [Abstract]	'
Minimum required pension plan contribution	$5.30
Partial credit balance utilized for minimum required contribution	29.2
Contribution of pension fund	2.5
Additional expected contribution	$2.50

Fair_Value_Measurement_Schedul

Fair Value Measurement - Schedule of Fair Value of Assets and Liabilities Measured on Recurring and Nonrecurring Basis (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total securities - available-for-sale	$1,006,079	$934,386
Other real estate owned and repossessed assets	5,106	4,860
Loans held for sale	10,641	5,855
Recurring Fair Value Measurements [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total securities - available-for-sale	1,006,079	934,386
Total recurring fair value measurements	1,006,079	934,386
Nonrecurring Fair Value Measurements [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Impaired loans	1,618	1,543
Other real estate owned and repossessed assets	5,106	4,860
Loans held for sale	10,641	5,855
Total nonrecurring fair value measurements	17,365	12,258
Obligations of Government Agencies [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total securities - available-for-sale	78,902	73,232
Obligations of Government Agencies [Member] | Recurring Fair Value Measurements [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total securities - available-for-sale	78,902	73,232
Residential Mortgage-Backed Securities and Collateralized Mortgage Obligations of Government Agencies [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total securities - available-for-sale	767,482	694,267
Residential Mortgage-Backed Securities and Collateralized Mortgage Obligations of Government Agencies [Member] | Recurring Fair Value Measurements [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total securities - available-for-sale	767,482	694,267
Obligations of State and Political Subdivisions [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total securities - available-for-sale	110,239	116,346
Obligations of State and Political Subdivisions [Member] | Recurring Fair Value Measurements [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total securities - available-for-sale	110,239	116,346
Corporate Debt Securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total securities - available-for-sale	36,892	38,481
Corporate Debt Securities [Member] | Recurring Fair Value Measurements [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total securities - available-for-sale	36,892	38,481
Equity Securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total securities - available-for-sale	12,564	12,060
Equity Securities [Member] | Recurring Fair Value Measurements [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total securities - available-for-sale	12,564	12,060
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total securities - available-for-sale	10,558	9,962
Loans held for sale	'	'
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Recurring Fair Value Measurements [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total securities - available-for-sale	10,558	9,962
Total recurring fair value measurements	10,558	9,962
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Nonrecurring Fair Value Measurements [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Impaired loans	'	'
Other real estate owned and repossessed assets	'	'
Loans held for sale	'	'
Total nonrecurring fair value measurements	'	'
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Obligations of Government Agencies [Member] | Recurring Fair Value Measurements [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total securities - available-for-sale	'	'
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Residential Mortgage-Backed Securities and Collateralized Mortgage Obligations of Government Agencies [Member] | Recurring Fair Value Measurements [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total securities - available-for-sale	'	'
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Obligations of State and Political Subdivisions [Member] | Recurring Fair Value Measurements [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total securities - available-for-sale	'	'
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Corporate Debt Securities [Member] | Recurring Fair Value Measurements [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total securities - available-for-sale	'	'
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity Securities [Member] | Recurring Fair Value Measurements [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total securities - available-for-sale	10,558	9,962
Significant Other Observable Inputs (Level 2) [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total securities - available-for-sale	995,521	924,424
Loans held for sale	10,641	5,855
Significant Other Observable Inputs (Level 2) [Member] | Recurring Fair Value Measurements [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total securities - available-for-sale	995,521	924,424
Total recurring fair value measurements	995,521	924,424
Significant Other Observable Inputs (Level 2) [Member] | Nonrecurring Fair Value Measurements [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Impaired loans	'	'
Other real estate owned and repossessed assets	'	'
Loans held for sale	10,641	5,855
Total nonrecurring fair value measurements	10,641	5,855
Significant Other Observable Inputs (Level 2) [Member] | Obligations of Government Agencies [Member] | Recurring Fair Value Measurements [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total securities - available-for-sale	78,902	73,232
Significant Other Observable Inputs (Level 2) [Member] | Residential Mortgage-Backed Securities and Collateralized Mortgage Obligations of Government Agencies [Member] | Recurring Fair Value Measurements [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total securities - available-for-sale	767,482	694,267
Significant Other Observable Inputs (Level 2) [Member] | Obligations of State and Political Subdivisions [Member] | Recurring Fair Value Measurements [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total securities - available-for-sale	110,239	116,346
Significant Other Observable Inputs (Level 2) [Member] | Corporate Debt Securities [Member] | Recurring Fair Value Measurements [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total securities - available-for-sale	36,892	38,481
Significant Other Observable Inputs (Level 2) [Member] | Equity Securities [Member] | Recurring Fair Value Measurements [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total securities - available-for-sale	2,006	2,098
Significant Unobservable Inputs (Level 3) [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total securities - available-for-sale	'	'
Loans held for sale	'	'
Significant Unobservable Inputs (Level 3) [Member] | Recurring Fair Value Measurements [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total securities - available-for-sale	'	'
Total recurring fair value measurements	'	'
Significant Unobservable Inputs (Level 3) [Member] | Nonrecurring Fair Value Measurements [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Impaired loans	1,618	1,543
Other real estate owned and repossessed assets	5,106	4,860
Loans held for sale	'	'
Total nonrecurring fair value measurements	6,724	6,403
Significant Unobservable Inputs (Level 3) [Member] | Obligations of Government Agencies [Member] | Recurring Fair Value Measurements [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total securities - available-for-sale	'	'
Significant Unobservable Inputs (Level 3) [Member] | Residential Mortgage-Backed Securities and Collateralized Mortgage Obligations of Government Agencies [Member] | Recurring Fair Value Measurements [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total securities - available-for-sale	'	'
Significant Unobservable Inputs (Level 3) [Member] | Obligations of State and Political Subdivisions [Member] | Recurring Fair Value Measurements [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total securities - available-for-sale	'	'
Significant Unobservable Inputs (Level 3) [Member] | Corporate Debt Securities [Member] | Recurring Fair Value Measurements [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total securities - available-for-sale	'	'
Significant Unobservable Inputs (Level 3) [Member] | Equity Securities [Member] | Recurring Fair Value Measurements [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Total securities - available-for-sale	'	'

Fair_Value_Measurement_Schedul1

Fair Value Measurement - Schedule of Assets Measured at Fair Value on Nonrecurring Basis (Detail) (USD $)	6 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'	'
Other real estate owned and repossessed assets	5,106	4,860
Nonrecurring Fair Value Measurements [Member]	'	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'	'
Impaired loans	1,618	1,543
Other real estate owned and repossessed assets	5,106	4,860
Minimum [Member]	'	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'	'
Impaired loans appraisal adjustments	0.00%	0.00%
Impaired loans liquidation expenses	-1.00%	-3.50%
Maximum [Member]	'	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'	'
Impaired loans appraisal adjustments	-36.10%	-29.10%
Impaired loans liquidation expenses	-8.00%	-8.00%
Weighted Average [Member]	'	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'	'
Impaired loans appraisal adjustments	-22.70%	-15.60%
Impaired loans liquidation expenses	-3.70%	-4.70%
Significant Unobservable Inputs (Level 3) [Member] | Nonrecurring Fair Value Measurements [Member]	'	'
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]	'	'
Impaired loans	1,618	1,543
Other real estate owned and repossessed assets	5,106	4,860

Fair_Value_Measurement_Estimat

Fair Value Measurement - Estimates Fair Value of Financial Instruments (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Financial Assets	'	'	'	'
Cash and due from banks	$94,488	$95,551	$78,070	$125,605
Securities available-for-sale	1,006,079	934,386	'	'
Securities held-to-maturity	607,695	598,520	'	'
Net loans	3,900,377	3,847,549	'	'
Loans held for sale	10,641	5,855	'	'
Accrued interest receivable	19,087	18,960	'	'
Bank owned life insurance	121,878	121,390	'	'
Financial Liabilities	'	'	'	'
Deposits	5,117,403	5,062,530	'	'
Federal Home Loan Bank borrowings	138,596	39,508	'	'
Other borrowings	94,745	150,536	'	'
Junior subordinated debt	106,156	106,137	'	'
Accrued interest payable	2,306	2,354	'	'
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]	'	'	'	'
Financial Assets	'	'	'	'
Cash and due from banks	94,488	95,551	'	'
Securities available-for-sale	10,558	9,962	'	'
Securities held-to-maturity	'	'	'	'
Net loans	'	'	'	'
Loans held for sale	'	'	'	'
Accrued interest receivable	19,087	18,960	'	'
Bank owned life insurance	121,878	121,390	'	'
Financial Liabilities	'	'	'	'
Deposits	3,691,573	3,551,052	'	'
Federal Home Loan Bank borrowings	'	'	'	'
Other borrowings	68,475	104,196	'	'
Junior subordinated debt	'	'	'	'
Accrued interest payable	2,306	2,354	'	'
Significant Other Observable Inputs (Level 2) [Member]	'	'	'	'
Financial Assets	'	'	'	'
Cash and due from banks	'	'	'	'
Securities available-for-sale	995,521	924,424	'	'
Securities held-to-maturity	627,805	595,581	'	'
Net loans	'	'	'	'
Loans held for sale	10,641	5,855	'	'
Accrued interest receivable	'	'	'	'
Bank owned life insurance	'	'	'	'
Financial Liabilities	'	'	'	'
Deposits	1,435,949	1,525,155	'	'
Federal Home Loan Bank borrowings	141,126	42,314	'	'
Other borrowings	28,186	48,819	'	'
Junior subordinated debt	77,075	74,038	'	'
Accrued interest payable	'	'	'	'
Significant Unobservable Inputs (Level 3) [Member]	'	'	'	'
Financial Assets	'	'	'	'
Cash and due from banks	'	'	'	'
Securities available-for-sale	'	'	'	'
Securities held-to-maturity	735	727	'	'
Net loans	3,784,772	3,754,465	'	'
Loans held for sale	'	'	'	'
Accrued interest receivable	'	'	'	'
Bank owned life insurance	'	'	'	'
Financial Liabilities	'	'	'	'
Deposits	'	'	'	'
Federal Home Loan Bank borrowings	'	'	'	'
Other borrowings	'	'	'	'
Junior subordinated debt	'	'	'	'
Accrued interest payable	'	'	'	'
Carrying Amount [Member]	'	'	'	'
Financial Assets	'	'	'	'
Cash and due from banks	94,488	95,551	'	'
Securities available-for-sale	1,006,079	934,386	'	'
Securities held-to-maturity	607,695	598,520	'	'
Net loans	3,900,377	3,847,549	'	'
Loans held for sale	10,641	5,855	'	'
Accrued interest receivable	19,087	18,960	'	'
Bank owned life insurance	121,878	121,390	'	'
Financial Liabilities	'	'	'	'
Deposits	5,117,403	5,062,530	'	'
Federal Home Loan Bank borrowings	138,596	39,508	'	'
Other borrowings	94,745	150,536	'	'
Junior subordinated debt	106,156	106,137	'	'
Accrued interest payable	2,306	2,354	'	'
Fair Value Estimate [Member]	'	'	'	'
Financial Assets	'	'	'	'
Cash and due from banks	94,488	95,551	'	'
Securities available-for-sale	1,006,079	934,386	'	'
Securities held-to-maturity	628,540	596,308	'	'
Net loans	3,784,772	3,754,465	'	'
Loans held for sale	10,641	5,855	'	'
Accrued interest receivable	19,087	18,960	'	'
Bank owned life insurance	121,878	121,390	'	'
Financial Liabilities	'	'	'	'
Deposits	5,127,522	5,076,207	'	'
Federal Home Loan Bank borrowings	141,126	42,314	'	'
Other borrowings	96,661	153,015	'	'
Junior subordinated debt	77,075	74,038	'	'
Accrued interest payable	$2,306	$2,354	'	'

Comprehensive_Income_Component

Comprehensive Income - Components of Accumulated Other Comprehensive Income (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Statement Of Income And Comprehensive Income [Abstract]	'	'	'	'
Beginning Balance, Defined Benefit Pension Plan	'	'	($7,966)	($21,401)
Defined Benefit Pension Plan, Other comprehensive income before reclassifications	'	'	'	'
Defined Benefit Pension Plan, Amounts reclassified from accumulated other comprehensive income	239	575	475	1,050
Defined Benefit Pension Plan, Period change	'	'	475	1,050
Ending Balance, Defined Benefit Pension Plan	-7,491	-20,351	-7,491	-20,351
Beginning Balance, Unrealized Gains (Losses) on Securities Available-for-Sale	'	'	-6,126	13,032
Unrealized Gains (Losses) on Securities Available-for-Sale, Other comprehensive income before reclassifications	'	'	7,194	-11,526
Unrealized Gains (Losses) on Securities Available-for-Sale, Amounts reclassified from accumulated other comprehensive income	-107	-71	-157	-82
Net effect on other comprehensive income for the period	'	'	7,037	-11,608
Ending Balance, Unrealized Gains (Losses) on Securities Available-for-Sale	911	1,424	911	1,424
Beginning Balance, Unrealized Gains on Securities Transferred from Available-for-Sale to Held-to-Maturity	'	'	1,358	2,004
Unrealized Gains on Securities Transferred from Available-for-Sale to Held-to-maturity, Other comprehensive income before reclassifications	'	'	'	'
Unrealized Gains on Securities Transferred from Available-for-Sale to Held-to-Maturity, Amounts reclassified from accumulated other comprehensive income	-84	-229	-171	-406
Unrealized Gains on Securities Transferred from Available-for-Sale to Held-to-Maturity, Period change	'	'	-171	-406
Ending Balance, Unrealized Gains on Securities Transferred from Available-for-Sale to Held-to-Maturity	1,187	1,598	1,187	1,598
Beginning Balance, Accumulated Other Comprehensive Income	'	'	-12,734	-6,365
Other comprehensive income before reclassifications	'	'	7,194	-11,526
Amounts reclassified from accumulated other comprehensive income	48	275	147	562
Other comprehensive income	'	'	7,341	-10,964
Ending Balance, Accumulated Other Comprehensive Income	($5,393)	($17,329)	($5,393)	($17,329)

Comprehensive_Income_Component1

Comprehensive Income - Components of Accumulated Other Comprehensive Income (Parenthetical) (Detail)	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Statement Of Income And Comprehensive Income [Abstract]	'	'
Percentage of Federal and State income tax rate	36.50%	36.50%

Comprehensive_Income_Schedule_

Comprehensive Income - Schedule of Accumulated Other Comprehensive Income Component Details (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Securities available-for-sale:	'	'	'	'
Net securities gains reclassified into earnings	($170)	($113)	($248)	($129)
Related income tax expense	63	42	91	47
Net effect on accumulated other comprehensive income for the period	-107	-71	-157	-82
Securities held-to-maturity:	'	'	'	'
Amortization of unrealized gain transferred from available-for-sale	-132	-362	-270	-650
Related income tax expense	48	133	99	244
Net effect on accumulated other comprehensive income for the period	-84	-229	-171	-406
Defined benefit pension plan:	'	'	'	'
Amortization of net loss and prior service costs	378	909	752	1,743
Related income tax expense	-139	-334	-277	-693
Net effect on accumulated other comprehensive income for the period	239	575	475	1,050
Total reclassifications for the period	$48	$275	$147	$562

Commitments_and_Contingent_Lia2

Commitments and Contingent Liabilities - Additional Information (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Commitments And Contingencies Disclosure [Abstract]	'	'	'	'
Allowance for credit losses associated with loan commitments	$536	$602	$317	$341

Commitments_and_Contingent_Lia3

Commitments and Contingent Liabilities - Commitments to Extend Credit, Guarantees and Various Letters of Credit Outstanding (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Commitments And Contingencies Disclosure [Abstract]	'	'
Lines of credit	$936,986	$964,777
Loans approved but not closed	132,542	73,937
Overdraft limits	88,648	96,291
Letters of credit	26,212	18,686
Contingent obligations to purchase loans funded by other entities	$6,313	$6,327

Business_Segments_Additional_I

Business Segments - Additional Information (Detail) (USD $)	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2014	Jun. 30, 2013
	Segment	Trust and Investment Services [Member]	Trust and Investment Services [Member]
Segment Reporting Information [Line Items]	'	'	'
Operating segments	2	'	'
Market value of assets held by trust and investment services segment	'	$3,800,000,000	$3,400,000,000
Total non-fiduciary assets	'	$3,900,000	$3,100,000

Business_Segments_Financial_In

Business Segments - Financial Information by Business Segment (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Segment Reporting Information [Line Items]	'	'	'	'
Interest income	$54,044	$54,424	$107,501	$109,317
Interest expense	5,737	8,435	11,870	17,199
Net interest income	48,307	45,989	95,631	92,118
Provision for credit losses	849	1,021	3,048	3,123
Net interest income after provision for credit losses	47,458	44,968	92,583	88,995
Non-interest income	18,241	17,724	35,290	35,220
Non-interest expense	40,304	39,499	80,398	80,246
Income before provision for income taxes	25,395	23,193	47,475	43,969
Provision for income taxes	6,520	6,176	12,179	10,932
Net income	18,875	17,017	35,296	33,037
Community Banking [Member]	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Interest income	54,044	54,424	107,501	109,317
Interest expense	5,737	8,435	11,870	17,199
Net interest income	48,307	45,989	95,631	92,118
Provision for credit losses	849	1,021	3,048	3,123
Net interest income after provision for credit losses	47,458	44,968	92,583	88,995
Non-interest income	13,031	12,901	24,432	25,380
Non-interest expense	37,367	36,620	74,193	74,372
Income before provision for income taxes	23,122	21,249	42,822	40,003
Provision for income taxes	5,611	5,399	10,318	9,346
Net income	17,511	15,850	32,504	30,657
Trust and Investment Services [Member]	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Interest income	'	'	'	'
Interest expense	'	'	'	'
Net interest income	'	'	'	'
Provision for credit losses	'	'	'	'
Net interest income after provision for credit losses	'	'	'	'
Non-interest income	5,210	4,823	10,858	9,840
Non-interest expense	2,937	2,879	6,205	5,874
Income before provision for income taxes	2,273	1,944	4,653	3,966
Provision for income taxes	909	777	1,861	1,586
Net income	$1,364	$1,167	$2,792	$2,380