F.N.B. (FNB) 10-Q 7 Nov 14 2014 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Sep. 30, 2014	Oct. 31, 2014
Document And Entity Information [Abstract]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	30-Sep-14	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q3	'
Trading Symbol	'FNB	'
Entity Registrant Name	'FNB CORP/FL/	'
Entity Central Index Key	'0000037808	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Large Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	173,538,511

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Assets	'	'
Cash and due from banks	$205,062	$197,534
Interest bearing deposits with banks	32,906	16,447
Cash and Cash Equivalents	237,968	213,981
Securities available for sale	1,439,735	1,141,650
Securities held to maturity (fair value of $1,480,229 and $1,189,563)	1,475,552	1,199,169
Residential mortgage loans held for sale	4,431	7,138
Loans, net of unearned income of $53,184 and $55,051	10,967,860	9,506,094
Allowance for loan losses	-120,601	-110,784
Net Loans	10,847,259	9,395,310
Premises and equipment, net	166,661	154,032
Goodwill	829,271	764,248
Core deposit and other intangible assets, net	50,017	47,608
Bank owned life insurance	299,828	289,402
Other assets	406,323	350,867
Total Assets	15,757,045	13,563,405
Liabilities	'	'
Non-interest bearing demand	2,647,081	2,200,081
Interest bearing demand	4,551,241	3,968,679
Savings	1,574,187	1,423,399
Certificates and other time deposits	2,679,584	2,606,073
Total Deposits	11,452,093	10,198,232
Other liabilities	157,230	130,418
Short-term borrowings	1,601,167	1,241,239
Long-term debt	483,189	143,928
Junior subordinated debt	58,233	75,205
Total Liabilities	13,751,912	11,789,022
Stockholders' Equity	'	'
Preferred stock-$0.01 par value Authorized-20,000,000 shares Issued-110,877 shares	106,882	106,882
Common stock - $0.01 par value Authorized - 500,000,000 shares Issued - 174,818,616 and 159,624,796 shares	1,747	1,592
Additional paid-in capital	1,791,674	1,608,117
Retained earnings	159,812	121,870
Accumulated other comprehensive loss	-40,451	-56,924
Treasury stock - 1,322,849 and 657,585 shares at cost	-14,531	-7,154
Total Stockholders' Equity	2,005,133	1,774,383
Total Liabilities and Stockholders' Equity	$15,757,045	$13,563,405

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, except Share data, unless otherwise specified
Statement of Financial Position [Abstract]	'	'
Securities held to maturity, fair value	$1,480,229	$1,189,563
Unearned income on loans	$53,184	$55,051
Preferred stock, par value	$0.01	$0.01
Preferred stock, shares authorized	20,000,000	20,000,000
Preferred stock, shares issued	110,877	110,877
Common stock, par value	$0.01	$0.01
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	174,818,616	159,624,796
Treasury stock, shares	1,322,849	657,585

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (Unaudited) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Interest Income	'	'	'	'
Loans, including fees	$116,468	$97,499	$330,107	$286,156
Securities:	'	'	'	'
Taxable	13,693	10,888	39,557	32,141
Nontaxable	1,356	1,377	3,934	4,336
Dividends	26	13	218	71
Other	23	13	70	45
Total Interest Income	131,566	109,790	373,886	322,749
Interest Expense	'	'	'	'
Deposits	7,457	6,895	22,067	22,503
Short-term borrowings	1,459	1,122	4,011	3,304
Long-term debt	1,692	719	3,850	2,268
Junior subordinated debt	339	1,800	1,322	5,578
Total Interest Expense	10,947	10,536	31,250	33,653
Net Interest Income	120,619	99,254	342,636	289,096
Provision for loan losses	11,197	7,280	28,608	22,724
Net Interest Income After Provision for Loan Losses	109,422	91,974	314,028	266,372
Non-Interest Income	'	'	'	'
Service charges	17,742	16,427	50,452	51,416
Trust fees	4,868	4,176	14,494	12,428
Insurance commissions and fees	4,169	4,088	12,805	12,619
Securities commissions and fees	3,132	2,575	8,525	8,365
Net securities gains	1,178	5	11,415	757
Mortgage banking	1,078	885	2,220	3,083
Bank owned life insurance	1,828	1,635	5,820	5,161
Other	3,557	3,019	13,081	9,290
Total Non-Interest Income	37,552	32,810	118,812	103,119
Non-Interest Expense	'	'	'	'
Salaries and employee benefits	49,590	45,155	147,008	132,261
Net occupancy	7,734	6,132	24,284	19,669
Equipment	7,625	6,415	21,701	18,013
Amortization of intangibles	2,455	2,067	7,199	6,063
Outside services	8,183	7,565	23,653	23,332
FDIC insurance	3,206	3,161	9,599	8,197
Merger related	1,904	913	8,054	4,211
Other	15,150	11,765	41,099	34,356
Total Non-Interest Expense	95,847	83,173	282,597	246,102
Income Before Income Taxes	51,127	41,611	150,243	123,389
Income taxes	15,736	9,977	45,497	34,024
Net Income	35,391	31,634	104,746	89,365
Less: Preferred stock dividends	2,010	'	6,342	'
Net Income Available to Common Stockholders	33,381	31,634	98,404	89,365
Net Income per Common Share - Basic	$0.20	$0.22	$0.60	$0.63
Net Income per Common Share - Diluted	$0.20	$0.22	$0.59	$0.62
Cash Dividends per Common Share	$0.12	$0.12	$0.36	$0.36
Comprehensive Income	$31,499	$27,540	$121,219	$69,418

Consolidated_Statement_of_Stoc

Consolidated Statement of Stockholders' Equity (Unaudited) (USD $)	Total	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]
In Thousands, unless otherwise specified
Balance at Dec. 31, 2012	$1,402,069	'	$1,398	$1,376,601	$75,312	($46,224)	($5,018)
Net income	89,365	'	'	'	89,365	'	'
Change in other comprehensive income (loss), net of tax	-19,947	'	'	'	'	-19,947	'
Dividends declared:	'	'	'	'	'	'	'
Common stock: $0.36/share	-52,028	'	'	'	-52,028	'	'
Issuance of common stock	1,282	'	11	3,318	'	'	-2,047
Issuance of common stock - acquisitions	56,289	'	46	56,243	'	'	'
Restricted stock compensation	3,339	'	'	3,339	'	'	'
Tax benefit of stock-based compensation	1,278	'	'	1,278	'	'	'
Balance at Sep. 30, 2013	1,481,647	'	1,455	1,440,779	112,649	-66,171	-7,065
Balance at Dec. 31, 2013	1,774,383	106,882	1,592	1,608,117	121,870	-56,924	-7,154
Net income	104,746	'	'	'	104,746	'	'
Change in other comprehensive income (loss), net of tax	16,473	'	'	'	'	16,473	'
Dividends declared:	'	'	'	'	'	'	'
Preferred stock	-6,342	'	'	'	-6,342	'	'
Common stock: $0.36/share	-60,234	'	'	'	-60,234	'	'
Issuance of common stock	1,418	'	16	9,007	-228	'	-7,377
Issuance of common stock - acquisitions	170,163	'	139	170,024	'	'	'
Restricted stock compensation	2,328	'	'	2,328	'	'	'
Tax benefit of stock-based compensation	2,198	'	'	2,198	'	'	'
Balance at Sep. 30, 2014	$2,005,133	$106,882	$1,747	$1,791,674	$159,812	($40,451)	($14,531)

Consolidated_Statement_of_Stoc1

Consolidated Statement of Stockholders' Equity (Unaudited) (Parenthetical) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Statement of Stockholders' Equity [Abstract]	'	'	'	'
Common stock dividends per share	$0.12	$0.12	$0.36	$0.36

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (Unaudited) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Operating Activities	'	'
Net income	$104,746	$89,365
Adjustments to reconcile net income to net cash flows provided by operating activities:	'	'
Depreciation, amortization and accretion	29,007	21,845
Provision for loan losses	28,608	22,724
Deferred tax (benefit) expenses	-2,533	12,246
Net securities gains	-11,415	-757
Tax benefit of stock-based compensation	-2,198	-1,278
Loans originated for sale	-98,741	-190,704
Loans sold	105,169	213,293
Gain on sale of loans	-3,721	-2,942
Net change in:	'	'
Interest receivable	-1,590	-1,568
Interest payable	-1,058	-2,836
Trading securities	241,595	88,052
Bank owned life insurance	-5,205	-1,808
Other, net	-4,165	18,610
Net cash flows provided by operating activities	378,499	264,242
Investing Activities	'	'
Net change in loans	-888,443	-473,933
Securities available for sale:	'	'
Purchases	-686,108	-250,724
Sales	175,872	21,919
Maturities	245,942	269,330
Securities held to maturity:	'	'
Purchases	-436,519	-335,533
Sales	4,570	17,429
Maturities	153,624	239,942
Purchase of bank owned life insurance	-16	-10,016
Withdrawal/surrender of bank owned life insurance	18,715	'
Increase in premises and equipment	-12,580	-7,745
Net cash received in business combinations	60,035	41,986
Net cash flows used in investing activities	-1,364,908	-487,345
Financing Activities	'	'
Demand (non-interest bearing and interest bearing) and savings accounts	654,144	536,442
Time deposits	-224,733	-240,111
Short-term borrowings	348,827	68,643
Increase in long-term debt	376,418	37,602
Decrease in long-term debt	-53,655	-73,867
Decrease in junior subordinated debt	-34,022	-15,000
Net proceeds from issuance of common stock	7,795	4,609
Tax benefit of stock-based compensation	2,198	1,278
Cash dividends paid:	'	'
Preferred stock	-6,342	'
Common stock	-60,234	-52,028
Net cash flows provided by financing activities	1,010,396	267,568
Net Increase (Decrease) in Cash and Cash Equivalents	23,987	44,465
Cash and cash equivalents at beginning of period	213,981	239,044
Cash and Cash Equivalents at End of Period	$237,968	$283,509

Business

Business	9 Months Ended
	Sep. 30, 2014
Accounting Policies [Abstract]	'
Business	'
	BUSINESS
	F.N.B. Corporation (the Corporation), headquartered in Pittsburgh, Pennsylvania, is a diversified financial services company operating in six states and three major metropolitan areas, including Pittsburgh, Baltimore, Maryland and Cleveland, Ohio. As of September 30, 2014, the Corporation had 289 banking offices throughout Pennsylvania, Ohio, Maryland and West Virginia. The Corporation provides a full range of commercial banking, consumer banking and wealth management solutions through its subsidiary network which is led by its largest affiliate, First National Bank of Pennsylvania (FNBPA). Commercial banking solutions include corporate banking, small business banking, investment real estate financing, international banking, business credit, capital markets and lease financing. Consumer banking products and services include deposit products, mortgage lending, consumer lending and a complete suite of mobile and online banking services. Wealth management services include asset management, private banking and insurance. The Corporation also operates Regency Finance Company (Regency), which had 71 consumer finance offices in Pennsylvania, Ohio, Kentucky and Tennessee as of September 30, 2014.

Basis_of_Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2014
Accounting Policies [Abstract]	'
Basis of Presentation	'
	BASIS OF PRESENTATION
	The Corporation’s accompanying consolidated financial statements and these notes to the financial statements include subsidiaries in which the Corporation has a controlling financial interest. The Corporation owns and operates FNBPA, First National Trust Company, First National Investment Services Company, LLC, F.N.B. Investment Advisors, Inc., First National Insurance Agency, LLC, Regency and Bank Capital Services, LLC, and includes results for each of these entities in the accompanying consolidated financial statements.
	The accompanying consolidated financial statements include all adjustments that are necessary, in the opinion of management, to fairly reflect the Corporation’s financial position and results of operations in accordance with U.S. generally accepted accounting principles (GAAP). All significant intercompany balances and transactions have been eliminated. Certain prior period amounts have been reclassified to conform to the current period presentation. Events occurring subsequent to the date of the balance sheet have been evaluated for potential recognition or disclosure in the consolidated financial statements through the date of the filing of the consolidated financial statements with the Securities and Exchange Commission (SEC).
	Certain information and note disclosures normally included in consolidated financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to the rules and regulations of the SEC. The interim operating results are not necessarily indicative of operating results the Corporation expects for the full year. These interim consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in the Corporation’s Annual Report on Form 10-K filed with the SEC on February 28, 2014.

Use_of_Estimates

Use of Estimates	9 Months Ended
	Sep. 30, 2014
Accounting Policies [Abstract]	'
Use of Estimates	'
	USE OF ESTIMATES
	The accounting and reporting policies of the Corporation conform with GAAP. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual results could materially differ from those estimates. Material estimates that are particularly susceptible to significant changes include the allowance for loan losses, securities valuations, goodwill and other intangible assets and income taxes.

Securities_Offerings

Securities Offerings	9 Months Ended
	Sep. 30, 2014
Equity [Abstract]	'
Securities Offerings	'
	SECURITIES OFFERINGS
	On November 1, 2013, the Corporation completed a public offering of 4,693,876 shares of common stock at a price of $12.25 per share, including 612,244 shares of common stock purchased by the underwriters pursuant to an over-allotment option, which the underwriters exercised in full. On November 1, 2013, the Corporation also completed a public offering of 4,000,000 Depositary Shares, each representing a 1/40th interest in the Non-Cumulative Perpetual Preferred Stock, Series E, of the Corporation, at a price of $25.00 per share. On November 14, 2013, the underwriters exercised their over-allotment option of 435,080 additional Depositary Shares at the same terms. The net proceeds of the common and preferred stock offerings after deducting underwriting discounts and commissions and offering expenses were $54,434 and $106,882, respectively.

Mergers_and_Acquisitions

Mergers and Acquisitions	9 Months Ended
	Sep. 30, 2014
Business Combinations [Abstract]	'
Mergers and Acquisitions	'
	MERGERS AND ACQUISITIONS
	OBA Financial Services, Inc.
	On September 19, 2014, the Corporation completed its acquisition of OBA Financial Services, Inc. (OBA), a bank holding company based in Germantown, Maryland. On the acquisition date, the estimated fair values of OBA included $393,597 in assets, $300,467 in loans and $295,922 in deposits. The acquisition was valued at approximately $85,567 and resulted in the Corporation issuing 7,170,037 shares of its common stock in exchange for 4,025,895 shares of OBA common stock. The Corporation also acquired the outstanding stock options of OBA that became fully vested upon the acquisition. The assets and liabilities of OBA were recorded on the Corporation’s consolidated balance sheet at their preliminary estimated fair values as of September 19, 2014, the acquisition date, and OBA’s results of operations have been included in the Corporation’s consolidated statement of comprehensive income since that date. OBA’s banking affiliate, OBA Bank, was merged into FNBPA on September 19, 2014. Based on a preliminary purchase price allocation, the Corporation recorded $18,238 in goodwill and $4,347 in core deposit intangibles as a result of the acquisition. These fair value estimates are provisional amounts based on third party valuations that are currently under review. None of the goodwill is deductible for income tax purposes.
	BCSB Bancorp, Inc.
	On February 15, 2014, the Corporation completed its acquisition of BCSB Bancorp, Inc. (BCSB), a bank holding company based in Baltimore, Maryland. On the acquisition date, the estimated fair values of BCSB included $595,263 in assets, $304,932 in loans and $532,197 in deposits. The acquisition was valued at approximately $80,544 and resulted in the Corporation issuing 6,730,597 shares of its common stock in exchange for 3,235,961 shares of BCSB common stock. The Corporation also acquired the outstanding stock options of BCSB that became fully vested upon the acquisition. The assets and liabilities of BCSB were recorded on the Corporation’s consolidated balance sheet at their fair values as of February 15, 2014, the acquisition date, and BCSB’s results of operations have been included in the Corporation’s consolidated statement of comprehensive income since that date. BCSB’s banking affiliate, Baltimore County Savings Bank, was merged into FNBPA on February 15, 2014. Based on the purchase price allocation, the Corporation recorded $43,758 in goodwill and $6,591 in core deposit intangibles as a result of the acquisition. None of the goodwill is deductible for income tax purposes.
	PVF Capital Corp.
	On October 12, 2013, the Corporation completed its acquisition of PVF Capital Corp. (PVF), a savings and loan holding company based in Solon, Ohio. On the acquisition date, the estimated fair values of PVF included $737,813 in assets, $512,795 in loans and $628,019 in deposits. The acquisition was valued at $109,856 and resulted in the Corporation issuing 8,893,598 shares of its common stock in exchange for 26,119,398 shares of PVF common stock. The Corporation also acquired the outstanding stock options of PVF that became fully vested upon the acquisition. The assets and liabilities of PVF were recorded on the Corporation’s consolidated balance sheets at their fair values as of October 12, 2013, the acquisition date, and PVF’s results of operations have been included in the Corporation’s consolidated statements of comprehensive income since that date. PVF’s banking affiliate, Park View Federal Savings Bank, was merged into FNBPA on October 12, 2013. Based on the purchase price allocation, the Corporation recorded $55,867 in goodwill and $6,867 in core deposit intangibles as a result of the acquisition. None of the goodwill is deductible for income tax purposes.
	Annapolis Bancorp, Inc.
	On April 6, 2013, the Corporation completed its acquisition of Annapolis Bancorp, Inc. (ANNB), a bank holding company based in Annapolis, Maryland. On the acquisition date, the estimated fair values of ANNB included $430,475 in assets, $256,212 in loans and $349,370 in deposits. The acquisition was valued at $56,300 and resulted in the Corporation issuing 4,641,412 shares of its common stock in exchange for 4,060,802 shares of ANNB common stock. The Corporation also acquired the outstanding stock options of ANNB that became fully vested upon the acquisition. Additionally, the Corporation paid $609, or $0.15 per share, to the holders of ANNB common stock as cash consideration due to the collection of a certain loan, as designated in the merger agreement. The assets and liabilities of ANNB were recorded on the Corporation’s consolidated balance sheets at their fair values as of April 6, 2013, the acquisition date, and ANNB’s results of operations have been included in the Corporation’s consolidated statements of comprehensive income since that date. ANNB’s banking affiliate, BankAnnapolis, was merged into FNBPA on April 6, 2013. In conjunction with the acquisition, a warrant issued by ANNB to the U.S. Department of the Treasury (UST) under the Capital Purchase Program (CPP) was assumed by the Corporation and converted into a warrant to purchase up to 342,564 shares of the Corporation’s common stock. The warrant expires January 30, 2019 and has an exercise price of $3.57 per share. Based on the purchase price allocation, the Corporation recorded $35,854 in goodwill and $3,775 in core deposit intangibles as a result of the acquisition. None of the goodwill is deductible for income tax purposes.

New_Accounting_Standards

New Accounting Standards	9 Months Ended
	Sep. 30, 2014
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]	'
New Accounting Standards	'
	NEW ACCOUNTING STANDARDS
	Presentation of Financial Statements
	In August 2014, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2014-15, Presentation of Financial Statements – Going Concern. ASU 2014-15 requires management to evaluate whether there is substantial doubt about the entity’s ability to continue as a going concern, and if so, disclose that fact. ASU 2014-15 defines substantial doubt as when it is probable that the entity will be unable to meet its obligations as they become due within one year of the date the financial statements are issued. The guidance states that when making this assessment, management should consider relevant conditions or events that are known or reasonably knowable on the date the financial statements are issued. The requirements of ASU 2014-15 are effective for reporting periods beginning after December 15, 2016, with early adoption permitted. The adoption of this update is not expected to have an effect on the financial statements, results of operations or liquidity of the Corporation.
	Troubled Debt Restructurings
	In August 2014, the FASB issued ASU No. 2014-14, Receivables – Troubled Debt Restructurings by Creditors. ASU 2014-14 requires that a mortgage loan be derecognized and that a separate other receivable be recognized upon foreclosure if the following conditions are met: (1) the loan has a government guarantee that is not separable from the loan before foreclosure; (2) at the time of foreclosure, the creditor has the intent to convey the real estate property to the guarantor and make a claim on the guarantee, and the creditor has the ability to recover under that claim; and (3) at the time of foreclosure, any amount of the claim that is determined on the basis of the fair value of the real estate is fixed. Upon foreclosure, the separate other receivable should be measured based on the amount of the loan balance (principal and interest) expected to be recovered from the guarantor. An entity can adopt the amendments in this guidance using either a prospective transition method or a modified retrospective method. For prospective transition, an entity should apply the amendments in this update to foreclosures that occur after the date of adoption. For modified retrospective transition, an entity should apply the amendments in this update by means of a cumulative-effect adjustment as of the beginning of the annual period of adoption. Prior periods should not be adjusted. The requirements of ASU 2014-14 are effective for reporting periods beginning after December 15, 2014, with early adoption permitted. The adoption of this update is not expected to have a material effect on the financial statements, results of operations or liquidity of the Corporation.
	In January 2014, the FASB issued ASU No. 2014-04, Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure, to clarify when an in-substance repossession or foreclosure occurs; that is, when a creditor should be considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan such that the loan should be derecognized and other real estate owned (OREO) recognized. ASU 2014-04 requires a creditor to reclassify a collateralized consumer mortgage loan to OREO upon obtaining legal title to the real estate collateral, or the borrower voluntarily conveying all interest in the real estate property to the lender to satisfy the loan through a deed in lieu of foreclosure or similar legal agreement. The requirements of ASU 2014-04 are effective for reporting periods beginning after December 15, 2014. The adoption of this update will not have an impact on the financial statements, results of operations or liquidity of the Corporation since the Corporation already accounts for foreclosures according to the requirements of this update.
	Stock Compensation
	In June 2014, the FASB issued ASU No. 2014-12, Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period. ASU 2014-12 provides guidance relating to the accounting for a performance target that could be achieved after the requisite service period. ASU 2014-12 requires that such performance targets be treated as a performance condition. As such, the performance target should not be reflected in estimating the grant-date fair value of the award. Compensation cost should be recognized in the period in which it becomes probable that the performance target will be achieved and should represent the compensation cost attributable to the periods for which the requisite service has already been rendered. The requirements of ASU 2014-12 are effective for reporting periods beginning after December 15, 2015, with early adoption permitted. Companies may apply the amendments in this standard either prospectively to all awards granted or modified after the effective date or retrospectively to all awards with performance targets that are outstanding as of the beginning of the earliest annual period presented in the financial statements and to all new or modified awards thereafter. If retrospective transition is adopted, the cumulative effect of applying ASU 2014-12 should be recognized as an adjustment to the beginning balance of retained earnings. The adoption of this update is not expected to have a material effect on the financial statements, results of operations or liquidity of the Corporation.
	Repurchase Agreements
	In June 2014, the FASB issued ASU No. 2014-11, Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures, that requires repurchase-to-maturity transactions to be accounted for as secured borrowings, eliminates current guidance on repurchase financings and requires separate accounting for a transfer of a financial asset executed contemporaneously with a repurchase agreement with the same counterparty. ASU 2014-11 also requires an entity to disclose information on transfers accounted for as sales in transactions that are economically similar to repurchase agreements and to disclose information about the types of collateral pledged in repurchase agreements and similar transactions accounted for as secured borrowings. The accounting changes in ASU 2014-11 are effective for the first interim or annual reporting period beginning after December 15, 2014. Changes in accounting for transactions outstanding on the effective date must be presented as a cumulative-effect adjustment to retained earnings as of the beginning of the period of adoption. Early adoption is prohibited. The disclosure for certain transactions accounted for as a sale is required to be presented for interim and annual reporting periods beginning after December 15, 2014. The disclosure for repurchase agreements and repurchase-to-maturity transactions accounted for as secured borrowings is required to be presented for annual periods beginning after December 15, 2014, and for interim periods beginning after March 15, 2015. The Corporation is evaluating this new guidance and has not yet determined the impact that the adoption of this update will have on its financial statements.
	Revenue Recognition
	In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers, to clarify the principles for recognizing revenue and to improve financial reporting by creating common revenue recognition guidance for GAAP and International Financial Reporting Standards. The core principle of the new guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. ASU 2014-09 is effective for annual reporting periods beginning after December 15, 2016, including interim periods within that reporting period. Early application is not permitted. An entity should apply the amendments in this update using either a full retrospective application or a modified retrospective application. Under the full retrospective application, an entity will apply the standard to each prior reporting period presented. Under the modified retrospective application, an entity recognizes the cumulative effect of initially applying the new standard as an adjustment to the opening balance of retained earnings at the date of initial application. Revenue in periods presented before that date will continue to be reported under guidance in effect before the change. The Corporation is evaluating this new guidance and has not yet determined which approach it will adopt to apply the amendments in ASU 2014-09 or the impact that the adoption of this update will have on its financial statements.
	Investments in Qualified Affordable Housing Projects
	In January 2014, the FASB issued ASU No. 2014-01, Accounting for Investments in Qualified Affordable Housing Projects, to revise the accounting for investments in qualified affordable housing projects. ASU 2014-01 modifies the conditions that must be met to present the pretax effects and related tax benefits of such investments as a component of income taxes (“net” within income tax expense). It is expected that the new guidance will enable more investors to use a “net” presentation for investments in qualified affordable housing projects. Investors that do not qualify for “net” presentation under the new guidance will continue to account for such investments under the equity method or cost method, which results in losses recognized in pretax income and tax benefits recognized in income taxes (“gross” presentation of investment results). For investments that qualify for the “net” presentation of investment performance, the guidance introduces a “proportional amortization method” that can be elected to amortize the investment basis. If elected, the method is required for all eligible investments in qualified affordable housing projects. The requirements of ASU 2014-01 are effective for reporting periods beginning after December 15, 2014, with early adoption permitted. The adoption of this update is not expected to have a material effect on the financial statements, results of operations or liquidity of the Corporation.
	Income Taxes
	In July 2013, the FASB issued ASU No. 2013-11, Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists, to provide guidance on the financial statement presentation of certain unrecognized tax benefits. An unrecognized tax benefit or a portion of an unrecognized tax benefit should be presented in the financial statements as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss or a tax credit carryforward with certain exceptions related to availability. The requirements of ASU 2013-11 are effective prospectively for reporting periods beginning after December 15, 2013, with early adoption permitted. The adoption of this update did not have a material effect on the financial statements, results of operations or liquidity of the Corporation.

Securities

Securities	9 Months Ended
	Sep. 30, 2014
Investments, Debt and Equity Securities [Abstract]	'
Securities	'
	SECURITIES
	The amortized cost and fair value of securities are as follows:
		Amortized			Gross			Gross			Fair Value
		Cost			Unrealized			Unrealized
					Gains			Losses
	Securities Available for Sale:
	September 30, 2014
	U.S. Treasury	$	29,570		$	—		$	(36	)	$	29,534
	U.S. government-sponsored entities		278,330			162			(2,984	)		275,508
	Residential mortgage-backed securities:
	Agency mortgage-backed securities		492,456			4,798			(771	)		496,483
	Agency collateralized mortgage obligations		608,284			645			(11,995	)		596,934
	Non-agency collateralized mortgage obligations		1,530			17			—			1,547
	Commercial mortgage-backed securities		8,062			—			(25	)		8,037
	States of the U.S. and political subdivisions		13,413			523			(42	)		13,894
	Other debt securities		16,587			473			(582	)		16,478
	Total debt securities		1,448,232			6,618			(16,435	)		1,438,415
	Equity securities		1,031			289			—			1,320
		$	1,449,263		$	6,907		$	(16,435	)	$	1,439,735
	December 31, 2013
	U.S. government-sponsored entities	$	336,763		$	126		$	(5,904	)	$	330,985
	Residential mortgage-backed securities:
	Agency mortgage-backed securities		247,880			4,304			(1,303	)		250,881
	Agency collateralized mortgage obligations		511,098			895			(20,794	)		491,199
	Non-agency collateralized mortgage obligations		1,747			15			—			1,762
	States of the U.S. and political subdivisions		16,842			410			(250	)		17,002
	Collateralized debt obligations		37,203			4,507			(10,115	)		31,595
	Other debt securities		16,505			524			(929	)		16,100
	Total debt securities		1,168,038			10,781			(39,295	)		1,139,524
	Equity securities		1,444			682			—			2,126
		$	1,169,482		$	11,463		$	(39,295	)	$	1,141,650
	Securities Held to Maturity:
	September 30, 2014
	U.S. Treasury	$	502		$	141		$	—		$	643
	U.S. government-sponsored entities		101,652			496			(937	)		101,211
	Residential mortgage-backed securities:
	Agency mortgage-backed securities		709,123			13,428			(1,792	)		720,759
	Agency collateralized mortgage obligations		494,791			1,061			(10,784	)		485,068
	Non-agency collateralized mortgage obligations		4,630			17			(2	)		4,645
	Commercial mortgage-backed securities		14,959			122			(99	)		14,982
	States of the U.S. and political subdivisions		149,895			3,119			(93	)		152,921
		$	1,475,552		$	18,384		$	(13,707	)	$	1,480,229
	December 31, 2013
	U.S. Treasury	$	503		$	99		$	—		$	602
	U.S. government-sponsored entities		43,322			180			(1,151	)		42,351
	Residential mortgage-backed securities:
	Agency mortgage-backed securities		628,681			12,281			(6,032	)		634,930
	Agency collateralized mortgage obligations		385,408			764			(15,844	)		370,328
	Non-agency collateralized mortgage obligations		6,852			44			(4	)		6,892
	Commercial mortgage-backed securities		2,241			124			(37	)		2,328
	States of the U.S. and political subdivisions		132,162			1,992			(2,022	)		132,132
		$	1,199,169		$	15,484		$	(25,090	)	$	1,189,563
	The Corporation classifies securities as trading securities when management intends to sell such securities in the near term. Such securities are carried at fair value, with unrealized gains (losses) reflected through the consolidated statements of comprehensive income. The Corporation classified certain securities acquired in conjunction with its acquisitions as trading securities. The Corporation both acquired and sold these trading securities during the quarterly periods in which each of the acquisitions occurred. As of September 30, 2014 and December 31, 2013, the Corporation did not hold any trading securities.
	Gross gains and gross losses were realized on securities as follows:
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2014			2013			2014			2013
	Gross gains	$	1,191		$	5		$	19,939		$	1,120
	Gross losses		(13	)		—			(8,524	)		(363	)
		$	1,178		$	5		$	11,415		$	757
	During the first quarter of 2014, the Corporation strategically sold its entire portfolio of pooled trust preferred securities (TPS) with net proceeds of $51,540 and a gain of $13,766. These were previously classified as collateralized debt obligations (CDOs) available for sale. Of the 23 pooled securities sold, one was determined to be a disallowed investment under the Volcker Rule (Section 619) of the Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010 (Dodd-Frank Act), and as such, was required to be disposed of by July 2015. Partially offsetting this gain was a net loss of $2,351 relating to the sale of other securities. By selling these securities, the Corporation strengthened the risk profile of its investment portfolio, improved its capital levels due to lowered risk-weighted assets and generated capital to support future growth.
	As of September 30, 2014, the amortized cost and fair value of securities, by contractual maturities, were as follows:
		Available for Sale						Held to Maturity
	Amortized			Fair			Amortized			Fair
	Cost			Value			Cost			Value
Due in one year or less	$	—		$	—		$	3,711		$	3,741
Due from one to five years		283,913			282,767			90,393			89,667
Due from five to ten years		47,102			46,344			79,109			80,905
Due after ten years		6,885			6,303			78,836			80,462
		337,900			335,414			252,049			254,775
Residential mortgage-backed securities:
Agency mortgage-backed securities		492,456			496,483			709,123			720,759
Agency collateralized mortgage obligations		608,284			596,934			494,791			485,068
Non-agency collateralized mortgage obligations		1,530			1,547			4,630			4,645
Commercial mortgage-backed securities		8,062			8,037			14,959			14,982
Equity securities		1,031			1,320			—			—
	$	1,449,263		$	1,439,735		$	1,475,552		$	1,480,229
Maturities may differ from contractual terms because borrowers may have the right to call or prepay obligations with or without penalties. Periodic payments are received on mortgage-backed securities based on the payment patterns of the underlying collateral.
At September 30, 2014 and December 31, 2013, securities with a carrying value of $1,114,235 and $909,548, respectively, were pledged to secure public deposits, trust deposits and for other purposes as required by law. Securities with a carrying value of $890,323 and $860,279 at September 30, 2014 and December 31, 2013, respectively, were pledged as collateral for short-term borrowings.
Following are summaries of the fair values and unrealized losses of securities, segregated by length of impairment:
	Less than 12 Months									12 Months or More								Total
	#			Fair Value			Unrealized			#			Fair Value		Unrealized			#		Fair Value		Unrealized
							Losses								Losses							Losses
Securities Available for Sale:
September 30, 2014
U.S. Treasury		3		$	29,534		$	(36	)		—		$	—	$	—			3	$	29,534	$	(36	)
U.S. government-sponsored entities		9			102,319			(259	)		8			113,264		(2,725	)		17		215,583		(2,984	)
Residential mortgage-backed securities:
Agency mortgage-backed securities		10			196,423			(771	)		—			—		—			10		196,423		(771	)
Agency collateralized mortgage obligations		14			292,696			(2,225	)		16			232,824		(9,770	)		30		525,520		(11,995	)
Commercial mortgage-backed securities		1			8,036			(25	)		—			—		—			1		8,036		(25	)
States of the U.S. and political subdivisions		—			—			—			1			1,149		(42	)		1		1,149		(42	)
Other debt securities		—			—			—			4			6,304		(582	)		4		6,304		(582	)
		37		$	629,008		$	(3,316	)		29		$	353,541	$	(13,119	)		66	$	982,549	$	(16,435	)
December 31, 2013
U.S. government-sponsored entities		17		$	232,962		$	(5,904	)		—		$	—	$	—			17	$	232,962	$	(5,904	)
Residential mortgage-backed securities:
Agency mortgage-backed securities		9			108,284			(1,303	)		—			—		—			9		108,284		(1,303	)
Agency collateralized mortgage obligations		26			389,989			(18,644	)		2			34,229		(2,150	)		28		424,218		(20,794	)
States of the U.S. and political subdivisions		2			3,022			(250	)		—			—		—			2		3,022		(250	)
Collateralized debt obligations		—			—			—			8			7,965		(10,115	)		8		7,965		(10,115	)
Other debt securities		—			—			—			4			5,950		(929	)		4		5,950		(929	)
		54		$	734,257		$	(26,101	)		14		$	48,144	$	(13,194	)		68	$	782,401	$	(39,295	)
Securities Held to Maturity:
September 30, 2014
U.S. government-sponsored entities		3		$	39,956		$	(151	)		3		$	39,247	$	(786	)		6	$	79,203	$	(937	)
Residential mortgage-backed securities:
Agency mortgage-backed securities		12			149,058			(631	)		8			83,697		(1,161	)		20		232,755		(1,792	)
Agency collateralized mortgage obligations		8			125,974			(1,036	)		16			216,359		(9,748	)		24		342,333		(10,784	)
Non-agency collateralized mortgage obligations		1			761			(2	)		—			—		—			1		761		(2	)
Commercial mortgage-backed securities		2			13,655			(99	)		—			—		—			2		13,655		(99	)
States of the U.S. and political subdivisions		1			1,726			(13	)		5			6,606		(80	)		6		8,332		(93	)
		27		$	331,130		$	(1,932	)		32		$	345,909	$	(11,775	)		59	$	677,039	$	(13,707	)
December 31, 2013
U.S. government-sponsored entities		2		$	24,513		$	(530	)		1		$	14,378	$	(621	)		3	$	38,891	$	(1,151	)
Residential mortgage-backed securities:
Agency mortgage-backed securities		24			308,864			(5,942	)		1			1,296		(90	)		25		310,160		(6,032	)
Agency collateralized mortgage obligations		21			301,312			(15,844	)		—			—		—			21		301,312		(15,844	)
Non-agency collateralized mortgage obligations		3			2,010			(4	)		—			—		—			3		2,010		(4	)
Commercial mortgage-backed securities		1			984			(37	)		—			—		—			1		984		(37	)
States of the U.S. and political subdivisions		27			31,537			(2,022	)		—			—		—			27		31,537		(2,022	)
		78		$	669,220		$	(24,379	)		2		$	15,674	$	(711	)		80	$	684,894	$	(25,090	)
The Corporation does not intend to sell the debt securities and it is not more likely than not the Corporation will be required to sell the securities before recovery of their amortized cost basis.
The Corporation’s unrealized losses on CDOs as of December 31, 2013 related to investments in pooled TPS, all of which were sold during the first quarter of 2014 as previously noted. The Corporation’s remaining portfolio of TPS consists of four single-issuer securities, which are primarily from money-center and large regional banks and are included in other debt securities. These single-issuer TPS had an amortized cost and estimated fair value of $6,885 and $6,304 at September 30, 2014, respectively. The Corporation has concluded from its analysis performed at September 30, 2014 that it is probable that the Corporation will collect all contractual principal and interest payments related to these securities.
Other-Than-Temporary Impairment
The Corporation evaluates its investment securities portfolio for other-than-temporary impairment (OTTI) on a quarterly basis. Impairment is assessed at the individual security level. The Corporation considers an investment security impaired if the fair value of the security is less than its cost or amortized cost basis. The following table presents a summary of the cumulative credit-related OTTI charges recognized as components of earnings for securities for which a portion of an OTTI is recognized in other comprehensive income:
	Collateralized			Residential			Equities			Total
	Debt			Non-Agency
	Obligations			CMOs
For the Nine Months Ended September 30, 2014
Beginning balance	$	17,155		$	—		$	27		$	17,182
Loss where impairment was not previously recognized		—			—			—			—
Additional loss where impairment was previously recognized		—			—			—			—
Reduction due to credit impaired securities sold		(17,155	)		—			—			(17,155	)
Ending balance	$	—		$	—		$	27		$	27
For the Nine Months Ended September 30, 2013
Beginning balance	$	17,155		$	212			—		$	17,367
Loss where impairment was not previously recognized		—			—			—			—
Additional loss where impairment was previously recognized		—			—			—			—
Reduction due to credit impaired securities sold		—			(212	)		—			(212	)
Ending balance	$	17,155		$	—			—		$	17,155
The Corporation did not recognize any impairment losses on securities for the nine months ended September 30, 2014 or 2013.
States of the U.S. and Political Subdivisions
The Corporation’s municipal bond portfolio of $163,789 as of September 30, 2014 is highly rated with an average entity-specific rating of AA and 99.0% of the portfolio rated A or better. General obligation bonds comprise 99.5% of the portfolio. Geographically, municipal bonds support the Corporation’s primary footprint as 86.8% of the securities are from municipalities located throughout Pennsylvania, Ohio and Maryland. The average holding size of the securities in the municipal bond portfolio is $1,092. In addition to the strong stand-alone ratings, 88.0% of the municipalities have some formal credit enhancement insurance that strengthens the creditworthiness of their issue. Management also reviews the credit profile of each issuer on a quarterly basis.

Federal_Home_Loan_Bank_Stock

Federal Home Loan Bank Stock	9 Months Ended
	Sep. 30, 2014
Banking and Thrift [Abstract]	'
Federal Home Loan Bank Stock	'
	FEDERAL HOME LOAN BANK STOCK
	The Corporation is a member of the Federal Home Loan Bank (FHLB) of Pittsburgh. The FHLB requires members to purchase and hold a specified minimum level of FHLB stock based upon their level of borrowings, collateral balances and participation in other programs offered by the FHLB. Stock in the FHLB is non-marketable and is redeemable at the discretion of the FHLB. Both cash and stock dividends on FHLB stock are reported as income.
	Members do not purchase stock in the FHLB for the same reasons that traditional equity investors acquire stock in an investor-owned enterprise. Rather, members purchase stock to obtain access to the low-cost products and services offered by the FHLB. Unlike equity securities of traditional for-profit enterprises, the stock of FHLB does not provide its holders with an opportunity for capital appreciation because, by regulation, FHLB stock can only be purchased, redeemed and transferred at par value.
	At September 30, 2014 and December 31, 2013, the Corporation’s FHLB stock totaled $58,372 and $23,636, respectively, and is included in other assets on the balance sheet. The Corporation accounts for the stock in accordance with ASC 325, which requires the investment to be carried at cost and evaluated for impairment based on the ultimate recoverability of the par value. Due to the continued improvement of the FHLB’s financial performance and stability over the past several years, the Corporation believes its holdings in the stock are ultimately recoverable at par value and, therefore, determined that FHLB stock was not other-than-temporarily impaired. In addition, the Corporation has ample liquidity and does not require redemption of its FHLB stock in the foreseeable future.

Loans_and_Allowance_for_Loan_L

Loans and Allowance for Loan Losses	9 Months Ended
	Sep. 30, 2014
Receivables [Abstract]	'
Loans and Allowance for Loan Losses	'
	LOANS AND ALLOWANCE FOR LOAN LOSSES
	Following is a summary of loans, net of unearned income:
			Originated			Acquired			Total
			Loans			Loans			Loans
	September 30, 2014
	Commercial real estate		$	2,930,146		$	860,018		$	3,790,164
	Commercial and industrial			2,104,559			143,046			2,247,605
	Commercial leases			171,615			—			171,615
	Total commercial loans and leases			5,206,320			1,003,064			6,209,384
	Direct installment			1,509,096			70,216			1,579,312
	Residential mortgages			762,743			469,053			1,231,796
	Indirect installment			803,201			2,635			805,836
	Consumer lines of credit			915,007			172,264			1,087,271
	Other			54,261			—			54,261
			$	9,250,628		$	1,717,232		$	10,967,860
	December 31, 2013
	Commercial real estate		$	2,640,428		$	604,781		$	3,245,209
	Commercial and industrial			1,761,668			119,806			1,881,474
	Commercial leases			158,895			—			158,895
	Total commercial loans and leases			4,560,991			724,587			5,285,578
	Direct installment			1,387,995			79,241			1,467,236
	Residential mortgages			678,227			408,512			1,086,739
	Indirect installment			649,701			5,886			655,587
	Consumer lines of credit			832,668			133,103			965,771
	Other			45,183			—			45,183
			$	8,154,765		$	1,351,329		$	9,506,094
	The carrying amount of acquired loans at September 30, 2014 totaled $1,711,200 including purchased credit-impaired (PCI) loans with a carrying amount of $7,512, while the carrying amount of acquired loans at December 31, 2013 totaled $1,345,429, including PCI loans with a carrying amount of $21,192. The outstanding contractual balance receivable of acquired loans at September 30, 2014 totaled $1,805,350, including PCI loans with an outstanding contractual balance receivable of $22,172, while the outstanding contractual balance receivable of acquired loans at December 31, 2013 totaled $1,449,227, including PCI loans with an outstanding contractual balance receivable of $56,500.
	Commercial real estate includes both owner-occupied and non-owner-occupied loans secured by commercial properties. Commercial and industrial includes loans to businesses that are not secured by real estate. Commercial leases are made for new or used equipment. Direct installment is comprised of fixed-rate, closed-end consumer loans for personal, family or household use, such as home equity loans and automobile loans. Residential mortgages consist of conventional and jumbo mortgage loans for non-commercial properties. Indirect installment is comprised of loans originated by third parties and underwritten by the Corporation, primarily automobile loans. Consumer lines of credit include home equity lines of credit (HELOC) and consumer lines of credit that are either unsecured or secured by collateral other than home equity. Other is comprised primarily of mezzanine loans and student loans.
	The loan portfolio consists principally of loans to individuals and small- and medium-sized businesses within the Corporation’s primary market area of Pennsylvania, eastern Ohio, Maryland and northern West Virginia. The total loan portfolio contains consumer finance loans to individuals in Pennsylvania, Ohio, Tennessee and Kentucky, which totaled $175,460 or 1.6% of total loans at September 30, 2014, compared to $179,970 or 1.9% of total loans at December 31, 2013. Due to the relative size of the consumer finance loan portfolio, they are not segregated from other consumer loans.
	As of September 30, 2014, 41.2% of the commercial real estate loans were owner-occupied, while the remaining 58.8% were non-owner-occupied, compared to 43.1% and 56.9%, respectively, as of December 31, 2013. As of September 30, 2014 and December 31, 2013, the Corporation had commercial construction loans of $299,859 and $252,842, respectively, representing 2.7% of total loans for both periods.
	ASC 310-30 Loans
	All loans acquired in acquisitions since 2009, except for revolving loans, are accounted for in accordance with ASC 310-30. Revolving loans are accounted for under ASC 310-20. The Corporation’s allowance for loan losses for acquired loans reflects only those losses incurred after acquisition.
	The following table reflects amounts at acquisition for all purchased loans subject to ASC 310-30 (impaired and non-impaired) acquired from BCSB in 2014 and PVF and ANNB in 2013. ASC 310-30 (impaired and non-impaired) loans acquired from OBA in 2014 are not presented because their values are expected to be immaterial, are preliminary in nature and are subject to refinement as additional information becomes available.
			Acquired			Acquired			Total
			Impaired			Performing
			Loans			Loans
	Acquired from BCSB in 2014
	Contractually required cash flows at acquisition		$	10,470		$	350,243		$	360,713
	Non-accretable difference (expected losses and foregone interest)			(5,426	)		(17,720	)		(23,146	)
	Cash flows expected to be collected at acquisition			5,044			332,523			337,567
	Accretable yield			(704	)		(70,407	)		(71,111	)
	Basis in acquired loans at acquisition		$	4,340		$	262,116		$	266,456
	Acquired from PVF and ANNB in 2013
	Contractually required cash flows at acquisition		$	40,972		$	796,114		$	837,086
	Non-accretable difference (expected losses and foregone interest)			(23,207	)		(52,992	)		(76,199	)
	Cash flows expected to be collected at acquisition			17,765			743,122			760,887
	Accretable yield			(2,505	)		(112,847	)		(115,352	)
	Basis in acquired loans at acquisition		$	15,260		$	630,275		$	645,535
	The following table provides a summary of change in accretable yield for all acquired loans:
			Acquired			Acquired			Total
			Impaired			Performing
			Loans			Loans
	Nine Months Ended September 30, 2014
	Balance at beginning of period		$	7,456		$	298,190		$	305,646
	Acquisitions			704			70,407			71,111
	Reduction due to unexpected early payoffs			—			(34,747	)		(34,747	)
	Reclass from non-accretable difference			2,612			7,313			9,925
	Disposals/transfers			(2,938	)		(2,452	)		(5,390	)
	Accretion			(4,530	)		(50,134	)		(54,664	)
	Balance at end of period		$	3,304		$	288,577		$	291,881
	Year Ended December 31, 2013
	Balance at beginning of period		$	778		$	253,375		$	254,153
	Acquisitions			2,505			112,847			115,352
Reduction due to unexpected early payoffs			—			(42,582	)		(42,582	)
Reclass from non-accretable difference			8,097			8,296			16,393
Disposals/transfers			(368	)		(224	)		(592	)
Accretion			(3,556	)		(33,522	)		(37,078	)
Balance at end of period		$	7,456		$	298,190		$	305,646
Purchased Credit-Impaired (PCI) Loans
The Corporation has acquired loans for which there was evidence of deterioration of credit quality since origination and for which it was probable, at acquisition, that all contractually required payments would not be collected.
Following is information about PCI loans identified in the Corporation’s acquisition of BCSB:
		At			September 30,
		Acquisition			2014
Outstanding balance		$	10,470		$	—
Carrying amount			4,340			—
Allowance for loan losses			n/a			—
Impairment recognized since acquisition			n/a			275
Allowance reduction recognized since acquisition			n/a			275
As of September 30, 2014, all BCSB PCI balances were resolved through loan sale, runoff or charge-off.
Following is information about PCI loans. The table below does not include impaired loans from the OBA acquisition because their values are expected to be immaterial, are preliminary in nature and are subject to refinement as additional information becomes available.
		Outstanding			Non-Accretable			Expected			Accretable			Recorded
		Balance			Difference			Cash Flows			Yield			Investment
For the Nine Months Ended September 30, 2014
Balance at beginning of period		$	56,500		$	(26,852	)	$	29,648		$	(7,456	)	$	22,192
Acquisitions			10,470			(5,426	)		5,044			(704	)		4,340
Accretion			—			—			—			4,530			4,530
Payments received			(21,000	)		1,877			(19,123	)		—			(19,123	)
Reclass from non-accretable difference			—			2,612			2,612			(2,612	)		—
Disposals/transfers			(25,900	)		19,299			(6,601	)		2,938			(3,663	)
Contractual interest			2,102			(2,102	)		—			—			—
Balance at end of period		$	22,172		$	(10,592	)	$	11,580		$	(3,304	)	$	8,276
For the Year Ended December 31, 2013
Balance at beginning of period		$	41,134		$	(23,733	)	$	17,401		$	(778	)	$	16,623
Acquisitions			42,031			(24,266	)		17,765			(2,505	)		15,260
Accretion			—			—			—			3,556			3,556
Payments received			(10,670	)		1,345			(9,325	)		—			(9,325	)
Reclass from non-accretable difference			—			8,097			8,097			(8,097	)		—
Disposals/transfers			(18,695	)		14,405			(4,290	)		368			(3,922	)
Contractual interest			2,700			(2,700	)		—			—			—
Balance at end of period		$	56,500		$	(26,852	)	$	29,648		$	(7,456	)	$	22,192
The accretion in the table above includes $1,790 in 2014 and $440 in 2013 that primarily represents amounts received on certain loans in excess of expected cash flows.
Credit Quality
Management monitors the credit quality of the Corporation’s loan portfolio on an ongoing basis. Measurement of delinquency and past due status are based on the contractual terms of each loan.
Non-performing loans include non-accrual loans and non-performing troubled debt restructurings (TDRs). Past due loans are reviewed on a monthly basis to identify loans for non-accrual status. The Corporation places a loan on non-accrual status and discontinues interest accruals on originated loans generally when principal or interest is due and has remained unpaid for a certain number of days unless the loan is both well secured and in the process of collection. Commercial loans are placed on non-accrual at 90 days, installment loans are placed on non-accrual at 120 days and residential mortgages and consumer lines of credit are generally placed on non-accrual at 180 days. When a loan is placed on non-accrual status, all unpaid interest is reversed. Non-accrual loans may not be restored to accrual status until all delinquent principal and interest have been paid and the ultimate ability to collect the remaining principal and interest is reasonably assured. TDRs are loans in which the borrower has been granted a concession on the interest rate or the original repayment terms due to financial distress. Non-performing assets also include debt securities on which OTTI has been taken in the current or prior periods that have not been returned to accrual status.
Following is a summary of non-performing assets:
		September 30,			December 31,
		2014			2013
Non-accrual loans		$	55,095		$	58,755
Troubled debt restructurings			21,797			18,698
Total non-performing loans			76,892			77,453
Other real estate owned (OREO)			39,040			40,681
Total non-performing loans and OREO			115,932			118,134
Non-performing investments			—			797
Total non-performing assets		$	115,932		$	118,931
Asset quality ratios:
Non-performing loans as a percent of total loans			0.7	%		0.81	%
Non-performing loans + OREO as a percent of total loans + OREO			1.05	%		1.24	%
Non-performing assets as a percent of total assets			0.74	%		0.88	%
The following tables provide an analysis of the aging of the Corporation’s past due loans by class, segregated by loans originated and loans acquired:
		30-89 Days			>90 Days			Non-Accrual			Total			Current			Total
		Past Due			Past Due and						Past Due						Loans
					Still Accruing
Originated loans:
September 30, 2014
Commercial real estate		$	3,711		$	132		$	33,710		$	37,553		$	2,892,593		$	2,930,146
Commercial and industrial			2,478			6			8,439			10,923			2,093,636			2,104,559
Commercial leases			985			—			651			1,636			169,979			171,615
Total commercial loans and leases			7,174			138			42,800			50,112			5,156,208			5,206,320
Direct installment			11,102			3,498			6,761			21,361			1,487,735			1,509,096
Residential mortgages			9,646			2,242			3,471			15,359			747,384			762,743
Indirect installment			5,255			536			1,190			6,981			796,220			803,201
Consumer lines of credit			2,581			646			873			4,100			910,907			915,007
Other			141			25			—			166			54,095			54,261
		$	35,899		$	7,085		$	55,095		$	98,079		$	9,152,549		$	9,250,628
December 31, 2013
Commercial real estate		$	5,428		$	252		$	40,960		$	46,640		$	2,593,788		$	2,640,428
Commercial and industrial			2,066			8			6,643			8,717			1,752,951			1,761,668
Commercial leases			714			—			734			1,448			157,447			158,895
Total commercial loans and leases			8,208			260			48,337			56,805			4,504,186			4,560,991
Direct installment			9,038			3,753			4,686			17,477			1,370,518			1,387,995
Residential mortgages			12,681			2,401			4,260			19,342			658,885			678,227
Indirect installment			5,653			471			1,060			7,184			642,517			649,701
Consumer lines of credit			1,737			1,076			412			3,225			829,443			832,668
Other			25			10			—			35			45,148			45,183
		$	37,342		$	7,971		$	58,755		$	104,068		$	8,050,697		$	8,154,765
		30-89			> 90 Days			Non-Accrual			Total			Current			Discount			Total
		Days			Past Due						Past									Loans
		Past Due			and Still						Due (1)
					Accruing
Acquired Loans:
September 30, 2014
Commercial real estate		$	14,415		$	14,019			—		$	28,434		$	866,319		$	(34,735	)	$	860,018
Commercial and industrial			350			2,306			—			2,656			147,605			(7,215	)		143,046
Commercial leases			—			—			—			—			—			—			—
Total commercial loans and leases			14,765			16,325			—			31,090			1,013,924			(41,950	)		1,003,064
Direct installment			1,280			1,399			—			2,679			65,972			1,565			70,216
Residential mortgages			11,010			18,573			—			29,583			479,330			(39,860	)		469,053
Indirect installment			45			22			—			67			2,991			(423	)		2,635
Consumer lines of credit			2,091			2,917			—			5,008			174,706			(7,450	)		172,264
Other			—			—			—			—			—			—			—
		$	29,191		$	39,236			—		$	68,427		$	1,736,923		$	(88,118	)	$	1,717,232
December 31, 2013
Commercial real estate		$	13,637		$	20,668			—		$	34,305		$	619,197		$	(48,721	)	$	604,781
Commercial and industrial			1,860			1,899			—			3,759			124,415			(8,368	)		119,806
Commercial leases			—			—			—			—			—			—			—
Total commercial loans and leases			15,497			22,567			—			38,064			743,612			(57,089	)		724,587
Direct installment			1,447			1,178			—			2,625			74,917			1,699			79,241
Residential mortgages			11,464			19,298			—			30,762			412,704			(34,954	)		408,512
Indirect installment			205			31			—			236			6,267			(617	)		5,886
Consumer lines of credit			1,592			2,749			—			4,341			135,699			(6,937	)		133,103
Other			—			—			—			—			—			—			—
		$	30,205		$	45,823			—		$	76,028		$	1,373,199		$	(97,898	)	$	1,351,329
-1	Past due information for acquired loans is based on the contractual balance outstanding at September 30, 2014 and December 31, 2013.
The Corporation utilizes the following categories to monitor credit quality within its commercial loan portfolio:
Rating Category		Definition
Pass		in general, the condition of the borrower and the performance of the loan is satisfactory or better
Special Mention		in general, the condition of the borrower has deteriorated, requiring an increased level of monitoring
Substandard		in general, the condition of the borrower has significantly deteriorated and the performance of
		the loan could further deteriorate if deficiencies are not corrected
Doubtful		in general, the condition of the borrower has significantly deteriorated and the collection in full
		of both principal and interest is highly questionable or improbable
The use of these internally assigned credit quality categories within the commercial loan portfolio permits management’s use of transition matrices to estimate a quantitative portion of credit risk. The Corporation’s internal credit risk grading system is based on past experiences with similarly graded loans and conforms with regulatory categories. In general, loan risk ratings within each category are reviewed on an ongoing basis according to the Corporation’s policy for each class of loans. Each quarter, management analyzes the resulting ratings, as well as other external statistics and factors such as delinquency, to track the migration performance of the commercial loan portfolio. Loans within the Pass credit category or that migrate toward the Pass credit category generally have a lower risk of loss compared to loans that migrate toward the Substandard or Doubtful credit categories. Accordingly, management applies higher risk factors to Substandard and Doubtful credit categories.
The following tables present a summary of the Corporation’s commercial loans by credit quality category, segregated by loans originated and loans acquired:
		Commercial Loan Credit Quality Categories
		Pass			Special			Substandard			Doubtful			Total
					Mention
Originated Loans:
September 30, 2014
Commercial real estate		$	2,784,908		$	52,952		$	91,385		$	901		$	2,930,146
Commercial and industrial			1,973,472			80,128			50,086			873			2,104,559
Commercial leases			170,465			291			859			—			171,615
		$	4,928,845		$	133,371		$	142,330		$	1,774		$	5,206,320
December 31, 2013
Commercial real estate		$	2,476,988		$	56,140		$	106,599		$	701		$	2,640,428
Commercial and industrial			1,611,530			97,675			52,322			141			1,761,668
Commercial leases			155,991			1,945			959			—			158,895
		$	4,244,509		$	155,760		$	159,880		$	842		$	4,560,991
Acquired Loans:
September 30, 2014
Commercial real estate		$	661,300		$	91,116		$	107,430		$	172		$	860,018
Commercial and industrial			119,457			5,447			18,142			—			143,046
Commercial leases			—			—			—			—			—
		$	780,757		$	96,563		$	125,572		$	172		$	1,003,064
December 31, 2013
Commercial real estate		$	442,604		$	74,315		$	85,086		$	2,776		$	604,781
Commercial and industrial			100,743			6,182			12,866			15			119,806
Commercial leases			—			—			—			—			—
		$	543,347		$	80,497		$	97,952		$	2,791		$	724,587
Credit quality information for acquired loans is based on the contractual balance outstanding at September 30, 2014 and December 31, 2013. The increase in acquired loans in 2014 primarily relates to the OBA and BCSB acquisitions on September 19, 2014 and February 15, 2014, respectively.
The Corporation uses delinquency transition matrices within the consumer and other loan classes to enable management to estimate a quantitative portion of credit risk. Each month, management analyzes payment and volume activity, FICO scores and other external factors such as unemployment, to determine how consumer loans are performing.
Following is a table showing originated consumer loans by payment status:
		Consumer Loan Credit Quality
		by Payment Status
		Performing			Non-Performing			Total
September 30, 2014
Direct installment		$	1,495,276		$	13,820		$	1,509,096
Residential mortgages			747,276			15,467			762,743
Indirect installment			801,862			1,339			803,201
Consumer lines of credit			913,224			1,783			915,007
Other			53,610			651			54,261
December 31, 2013
Direct installment		$	1,377,418		$	10,577		$	1,387,995
Residential mortgages			664,214			14,013			678,227
Indirect installment			648,499			1,202			649,701
Consumer lines of credit			832,071			597			832,668
Other			45,183			—			45,183
Loans are designated as impaired when, in the opinion of management, based on current information and events, the collection of principal and interest in accordance with the loan contract is doubtful. Typically, the Corporation does not consider loans for impairment unless a sustained period of delinquency (i.e., 90-plus days) is noted or there are subsequent events that impact repayment probability (i.e., negative financial trends, bankruptcy filings, imminent foreclosure proceedings, etc.). Impairment is evaluated in the aggregate for consumer installment loans, residential mortgages, consumer lines of credit and commercial loan relationships less than $500 based on loan segment loss given default. For commercial loan relationships greater than or equal to $500, a specific valuation allowance is allocated, if necessary, so that the loan is reported net, at the present value of estimated future cash flows using a market interest rate or at the fair value of collateral if repayment is expected solely from the collateral. Consistent with the Corporation’s existing method of income recognition for loans, interest on impaired loans, except those classified as non-accrual, is recognized as income using the accrual method. Impaired loans, or portions thereof, are charged off when deemed uncollectible.
Following is a summary of information pertaining to originated loans considered to be impaired, by class of loans:
		Recorded			Unpaid			Specific			Average
		Investment			Principal			Related			Recorded
					Balance			Allowance			Investment
At or For the Nine Months Ended September 30, 2014
With no specific allowance recorded:
Commercial real estate		$	24,718		$	33,948		$	—		$	31,351
Commercial and industrial			7,494			9,191			—			7,455
Commercial leases			651			651			—			719
Total commercial loans and leases			32,863			43,790			—			39,525
Direct installment			13,820			14,189			—			13,226
Residential mortgages			15,467			17,397			—			15,662
Indirect installment			1,339			1,504			—			1,436
Consumer lines of credit			1,783			1,791			—			1,695
Other			—			—			—			—
With a specific allowance recorded:
Commercial real estate			10,571			23,263			901			6,688
Commercial and industrial			1,966			1,995			870			2,195
Commercial leases			—			—			—			—
Total commercial loans and leases			12,537			25,258			1,771			8,883
Direct installment			—			—			—			—
Residential mortgages			—			—			—			—
Indirect installment			—			—			—			—
Consumer lines of credit			—			—			—			—
Other			—			—			—			—
Total:
Commercial real estate			35,289			57,211			901			38,039
Commercial and industrial			9,460			11,186			870			9,650
Commercial leases			651			651			—			719
Total commercial loans and leases			45,400			69,048			1,771			48,408
Direct installment			13,820			14,189			—			13,226
Residential mortgages			15,467			17,397			—			15,662
Indirect installment			1,339			1,504			—			1,436
Consumer lines of credit			1,783			1,791			—			1,695
Other			—			—			—			—
		Recorded			Unpaid			Specific			Average
		Investment			Principal			Related			Recorded
					Balance			Allowance			Investment
At or For the Year Ended December 31, 2013
With no specific allowance recorded:
Commercial real estate		$	40,472		$	62,034		$	—		$	37,376
Commercial and industrial			7,301			8,669			—			8,304
Commercial leases			734			734			—			758
Total commercial loans and leases			48,507			71,437			—			46,438
Direct installment			10,577			10,830			—			10,557
Residential mortgages			14,012			14,560			—			13,565
Indirect installment			1,202			2,633			—			1,127
Consumer lines of credit			597			668			—			573
Other			—			—			—			—
With a specific allowance recorded:
Commercial real estate			3,603			3,818			701			14,379
Commercial and industrial			122			130			123			126
Commercial leases			—			—			—			—
Total commercial loans and leases			3,725			3,948			824			14,505
Direct installment			—			—			—			—
Residential mortgages			—			—			—			—
Indirect installment			—			—			—			—
Consumer lines of credit			—			—			—			—
Other			—			—			—			—
Total:
Commercial real estate			44,075			65,852			701			51,755
Commercial and industrial			7,423			8,799			123			8,430
Commercial leases			734			734			—			758
Total commercial loans and leases			52,232			75,385			824			60,943
Direct installment			10,577			10,830			—			10,557
Residential mortgages			14,012			14,560			—			13,565
Indirect installment			1,202			2,633			—			1,127
Consumer lines of credit			597			668			—			573
Other			—			—			—			—
Interest income is generally no longer recognized once a loan becomes impaired.
The above tables do not include PCI loans with a recorded investment of $8,276 at September 30, 2014 and $22,192 at December 31, 2013. These tables do not reflect the additional allowance for loan losses relating to acquired loans in the following pools and categories: commercial real estate of $3,025; commercial and industrial of $644; direct installment of $1,530; residential mortgages of $326; indirect installment of $243; and consumer lines of credit of $264, totaling $6,032 at September 30, 2014 and commercial real estate of $3,093; commercial and industrial of $786; direct installment of $727; residential mortgages of $970 and indirect installment of $324, totaling $5,900 at December 31, 2013.
Troubled Debt Restructurings
TDRs are loans whose contractual terms have been modified in a manner that grants a concession to a borrower experiencing financial difficulties. TDRs typically result from loss mitigation activities and could include the extension of a maturity date, interest rate reduction, principal forgiveness, deferral or decrease in payments for a period of time and other actions intended to minimize the economic loss and to avoid foreclosure or repossession of collateral.
Following is a summary of the payment status of total TDRs:
		September 30,			December 31,
		2014			2013
Accruing:
Performing		$	9,899		$	10,220
Non-performing			21,797			18,698
Non-accrual			9,677			12,705
		$	41,373		$	41,623
TDRs that are accruing and performing include loans that met the criteria for non-accrual of interest prior to restructuring for which the Corporation can reasonably estimate the timing and amount of the expected cash flows on such loans and for which the Corporation expects to fully collect the new carrying value of the loans. During the nine months ended September 30, 2014, the Corporation returned to performing status $2,862 in restructured residential mortgage loans that have consistently met their modified obligations for more than six months. TDRs that are accruing and non-performing are comprised of consumer loans that have not demonstrated a consistent repayment pattern on the modified terms for more than six months, however it is expected that the Corporation will collect all future principal and interest payments. TDRs that are on non-accrual are not placed on accruing status until all delinquent principal and interest have been paid and the ultimate collectability of the remaining principal and interest is reasonably assured. Some loan modifications classified as TDRs may not ultimately result in the full collection of principal and interest, as modified, and may result in potential incremental losses which are factored into the allowance for loan losses.
Excluding purchased impaired loans, commercial loans over $500 whose terms have been modified in a TDR are generally placed on non-accrual, individually analyzed and measured for estimated impairment based on the fair value of the underlying collateral. The Corporation’s allowance for loan losses included specific reserves for commercial TDRs of $400 and $561 at September 30, 2014 and December 31, 2013, respectively, and pooled reserves for individual loans under $500 of $1,047 and $193 for those same respective periods, based on loan segment loss given default. Upon default, the amount of the recorded investment in the TDR in excess of the fair value of the collateral, less estimated selling costs, is generally considered a confirmed loss and is charged-off against the allowance for loan losses.
All other classes of loans, which are primarily secured by residential properties, whose terms have been modified in a TDR are pooled and measured for estimated impairment based on the expected net present value of the estimated future cash flows of the pool. The Corporation’s allowance for loan losses included pooled reserves for these classes of loans of $1,098 and $1,005 at September 30, 2014 and December 31, 2013, respectively. Upon default of an individual loan, the Corporation’s charge-off policy is followed accordingly for that class of loan.
The majority of TDRs are the result of interest rate concessions for a limited period of time. Following is a summary of loans, by class, that have been restructured during the periods indicated:
		Three Months Ended September 30, 2014									Nine Months Ended September 30, 2014
		Number			Pre-Modification			Post-			Number			Pre-Modification			Post-
		of			Outstanding			Modification			of			Outstanding			Modification
		Contracts			Recorded			Outstanding			Contracts			Recorded			Outstanding
					Investment			Recorded						Investment			Recorded
								Investment									Investment
Commercial real estate			1		$	50		$	48			10		$	2,633		$	2,187
Commercial and industrial			2			126			119			3			323			307
Commercial leases			—			—			—			—			—			—
Total commercial loans and leases			3			176			167			13			2,956			2,494
Direct installment			116			1,323			1,240			378			4,922			4,693
Residential mortgages			9			480			470			33			1,847			1,784
Indirect installment			7			18			15			20			52			48
Consumer lines of credit			6			88			56			31			899			857
Other			—			—			—			—			—			—
			141		$	2,085		$	1,948			475		$	10,676		$	9,876
		Three Months Ended September 30, 2013									Nine Months Ended September 30, 2013
		Number			Pre-Modification			Post-			Number			Pre-Modification			Post-
		of			Outstanding			Modification			of			Outstanding			Modification
		Contracts			Recorded			Outstanding			Contracts			Recorded			Outstanding
					Investment			Recorded						Investment			Recorded
								Investment									Investment
Commercial real estate			2		$	212		$	207			7		$	1,252		$	1,031
Commercial and industrial			—			—			—			—			—			—
Commercial leases			—			—			—			—			—			—
Total commercial loans and leases			2			212			207			7			1,252			1,031
Direct installment			117			1,199			1,168			300			3,078			2,930
Residential mortgages			9			346			348			39			1,809			1,784
Indirect installment			5			20			18			20			92			84
Consumer lines of credit			1			6			6			14			207			204
Other			—			—			—			—			—			—
			134		$	1,783		$	1,747			380		$	6,438		$	6,033
Following is a summary of TDRs, by class of loans, for which there was a payment default, excluding loans that were either charged-off or cured by period end. Default occurs when a loan is 90 days or more past due and is within 12 months of restructuring.
		Three Months Ended						Nine Months Ended
		September 30, 2014 (1)						September 30, 2014 (1)
		Number of			Recorded			Number of			Recorded
		Contracts			Investment			Contracts			Investment
Commercial real estate			—		$	—			—		$	—
Commercial and industrial			—			—			—			—
Commercial leases			—			—			—			—
Total commercial loans and leases			—			—			—			—
Direct installment			41			356			80			732
Residential mortgages			2			33			2			33
Indirect installment			3			10			4			11
Consumer lines of credit			1			50			1			50
Other			—			—			—			—
			47		$	449			87		$	826
		Three Months Ended						Nine Months Ended
		September 30, 2013 (1)						September 30, 2013 (1)
		Number of			Recorded			Number of			Recorded
		Contracts			Investment			Contracts			Investment
Commercial real estate			—		$	—			1		$	751
Commercial and industrial			—			—			1			15
Commercial leases			—			—			—			—
Total commercial loans and leases			—			—			2			766
Direct installment			24			254			53			509
Residential mortgages			2			99			5			240
Indirect installment			—			—			4			37
Consumer lines of credit			1			85			1			85
Other			—			—			—			—
			27		$	438			65		$	1,637
-1	The recorded investment is as of period end.
Allowance for Loan Losses
The allowance for loan losses is established as losses are estimated to have occurred through a provision charged to earnings. Loan losses are charged against the allowance for loan losses when management believes the uncollectability of a loan balance is confirmed. Subsequent recoveries, if any, are credited to the allowance for loan losses. Allowances for impaired commercial loans over $500 are generally determined based on collateral values or the present value of estimated cash flows. All other impaired loans are evaluated in the aggregate based on loan segment loss given default. Changes in the allowance for loan losses related to impaired loans are charged or credited to the provision for loan losses.
The allowance for loan losses is maintained at a level that, in management’s judgment, is believed adequate to absorb probable losses associated with specifically identified loans, as well as estimated probable credit losses inherent in the remainder of the loan portfolio. Adequacy of the allowance for loan losses is based on management’s evaluation of potential loan losses in the loan portfolio, which includes an assessment of past experience, current economic conditions in specific industries and geographic areas, general economic conditions, known and inherent risks in the loan portfolio, the estimated value of underlying collateral and residuals and changes in the composition of the loan portfolio. Determination of the allowance for loan losses is inherently subjective as it requires significant estimates, including the amounts and timing of expected future cash flows on impaired loans, estimated losses on pools of homogeneous loans based on transition matrices with predefined loss emergence periods and consideration of qualitative factors, all of which are susceptible to significant change.
Credit impaired loans obtained through acquisitions are accounted for under the provisions of ASC 310-30. The Corporation also accounts for certain acquired loans considered performing at the time of acquisition by analogy to ASC 310-30. ASC 310-30 requires the initial recognition of acquired loans at the present value of amounts expected to be received. Any deterioration in the credit quality of acquired loans subsequent to acquisition would be considered in the allowance for loan losses.
Following is a summary of changes in the allowance for loan losses, by loan class:
		Balance at			Charge-			Recoveries			Net			Provision			Balance at
		Beginning			Offs						Charge-			for Loan			End of
		of Period									Offs			Losses			Period
Three Months Ended September 30, 2014
Commercial real estate		$	38,478		$	(1,724	)	$	506		$	(1,218	)	$	(80	)	$	37,180
Commercial and industrial			33,017			(1,796	)		192			(1,604	)		2,883			34,296
Commercial leases			2,079			(167	)		11			(156	)		282			2,205
Total commercial loans and leases			73,574			(3,687	)		709			(2,978	)		3,085			73,681
Direct installment			16,844			(2,369	)		271			(2,098	)		4,814			19,560
Residential mortgages			5,506			(87	)		13			(74	)		1,218			6,650
Indirect installment			6,693			(898	)		211			(687	)		364			6,370
Consumer lines of credit			7,664			(360	)		50			(310	)		587			7,941
Other			907			(341	)		9			(332	)		(208	)		367
Total allowance on originated loans			111,188			(7,742	)		1,263			(6,479	)		9,860			114,569
Purchased credit-impaired loans			448			(712	)		1			(711	)		1,026			763
Other acquired loans			5,112			(113	)		(41	)		(154	)		311			5,269
Total allowance on acquired loans			5,560			(825	)		(40	)		(865	)		1,337			6,032
Total allowance		$	116,748		$	(8,567	)	$	1,223		$	(7,344	)	$	11,197		$	120,601
Nine Months Ended September 30, 2014
Commercial real estate		$	32,548		$	(5,519	)	$	1,068		$	(4,451	)	$	9,083		$	37,180
Commercial and industrial			32,603			(2,849	)		730			(2,119	)		3,812			34,296
Commercial leases			1,903			(317	)		93			(224	)		526			2,205
Total commercial loans and leases			67,054			(8,685	)		1,891			(6,794	)		13,421			73,681
Direct installment			17,824			(7,154	)		821			(6,333	)		8,069			19,560
Residential mortgages			5,836			(356	)		61			(295	)		1,109			6,650
Indirect installment			6,409			(2,396	)		658			(1,738	)		1,699			6,370
Consumer lines of credit			7,231			(1,023	)		143			(880	)		1,590			7,941
Other			530			(910	)		19			(891	)		728			367
Total allowance on originated loans			104,884			(20,524	)		3,593			(16,931	)		26,616			114,569
Purchased credit-impaired loans			1,000			(2,614	)		1			(2,613	)		2,376			763
Other acquired loans			4,900			(230	)		983			753			(384	)		5,269
Total allowance on acquired loans			5,900			(2,844	)		984			(1,860	)		1,992			6,032
Total allowance		$	110,784		$	(23,368	)	$	4,577		$	(18,791	)	$	28,608		$	120,601
		Balance at			Charge-			Recoveries			Net			Provision			Balance at
		Beginning			Offs						Charge-			for Loan			End of
		of Period									Offs			Losses			Period
Three Months Ended September 30, 2013
Commercial real estate		$	35,666		$	(365	)	$	80		$	(285	)	$	(538	)	$	34,843
Commercial and industrial			32,486			(1,529	)		231			(1,298	)		1,460			32,648
Commercial leases			1,756			(69	)		59			(10	)		21			1,767
Total commercial loans and leases			69,908			(1,963	)		370			(1,593	)		943			69,258
Direct installment			15,993			(2,183	)		227			(1,956	)		3,194			17,231
Residential mortgages			5,120			(174	)		50			(124	)		437			5,433
Indirect installment			5,626			(807	)		188			(619	)		1,120			6,127
Consumer lines of credit			6,421			(454	)		660			(394	)		1,052			7,079
Other			(219	)		(333	)		—			(333	)		760			208
Total allowance on originated loans			102,849			(5,914	)		895			(5,019	)		7,506			105,336
Purchased credit-impaired loans			325			—			—			—			337			662
Other acquired loans			5,106			70			(559	)		(489	)		(563	)		4,054
Total allowance on acquired loans			5,431			70			(559	)		(489	)		(226	)		4,716
Total allowance		$	108,280		$	(5,844	)	$	336		$	(5,508	)	$	7,280		$	110,052
Nine Months Ended September 30, 2013
Commercial real estate		$	34,810		$	(3,067	)	$	1,606		$	(1,461	)	$	1,494		$	34,843
Commercial and industrial			31,849			(4,262	)		734			(3,528	)		4,327			32,648
Commercial leases			1,744			(317	)		161			(156	)		179			1,767
Total commercial loans and leases			68,403			(7,646	)		2,501			(5,145	)		6,000			69,258
Direct installment			15,130			(6,824	)		709			(6,115	)		8,216			17,231
Residential mortgages			5,155			(733	)		90			(643	)		921			5,433
Indirect installment			5,449			(2,349	)		576			(1,773	)		2,451			6,127
Consumer lines of credit			6,057			(1,183	)		209			(974	)		1,996			7,079
Other			—			(721	)		—			(721	)		929			208
Total allowance on originated loans			100,194			(19,456	)		4,085			(15,371	)		20,513			105,336
Purchased credit-impaired loans			759			(156	)		—			(156	)		59			662
Other acquired loans			3,421			(1,199	)		(320	)		(1,519	)		2,152			4,054
Total allowance on acquired loans			4,180			(1,355	)		(320	)		(1,675	)		2,211			4,716
Total allowance		$	104,374		$	(20,811	)	$	3,765		$	(17,046	)	$	22,724		$	110,052
Following is a summary of the individual and collective originated allowance for loan losses and corresponding loan balances by class:
		Allowance						Loans Outstanding
		Individually			Collectively			Loans			Individually			Collectively
		Evaluated for			Evaluated for						Evaluated for			Evaluated for
		Impairment			Impairment						Impairment			Impairment
September 30, 2014
Commercial real estate		$	901		$	36,279		$	2,930,146		$	21,619		$	2,908,527
Commercial and industrial			870			33,426			2,104,559			5,966			2,098,593
Commercial leases			—			2,205			171,615			—			171,615
Total commercial loans and leases			1,771			71,910			5,206,320			27,585			5,178,735
Direct installment			—			19,560			1,509,096			—			1,509,096
Residential mortgages			—			6,650			762,743			—			762,743
Indirect installment			—			6,370			803,201			—			803,201
Consumer lines of credit			—			7,941			915,007			—			915,007
Other			—			367			54,261			—			54,261
		$	1,771		$	112,798		$	9,250,628		$	27,585		$	9,223,043
December 31, 2013
Commercial real estate		$	701		$	31,847		$	2,640,428		$	30,133		$	2,610,295
Commercial and industrial			123			32,480			1,761,668			4,243			1,757,425
Commercial leases			—			1,903			158,895			—			158,895
Total commercial loans and leases			824			66,230			4,560,991			34,376			4,526,615
Direct installment			—			17,824			1,387,995			—			1,387,995
Residential mortgages			—			5,836			678,227			—			678,227
Indirect installment			—			6,409			649,701			—			649,701
Consumer lines of credit			—			7,231			832,668			—			832,668
Other			—			530			45,183			—			45,183
		$	824		$	104,060		$	8,154,765		$	34,376		$	8,120,389

Borrowings

Borrowings	9 Months Ended
	Sep. 30, 2014
Debt Disclosure [Abstract]	'
Borrowings	'
	BORROWINGS
	Following is a summary of short-term borrowings:
		September 30,		December 31,
		2014		2013
	Securities sold under repurchase agreements	$	857,217	$	841,741
	Federal Home Loan Bank advances		450,000		—
	Federal funds purchased		165,000		270,000
	Subordinated notes		128,950		129,498
		$	1,601,167	$	1,241,239
	Securities sold under repurchase agreements is comprised of customer repurchase agreements, which are sweep accounts with next day maturities utilized by larger commercial customers to earn interest on their funds. Securities are pledged to these customers in an amount equal to the outstanding balance.
	Following is a summary of long-term debt:
		September 30,		December 31,
		2014		2013
	Federal Home Loan Bank advances	$	400,056	$	50,076
	Subordinated notes		83,133		84,637
	Other subordinated debt		—		8,637
	Convertible debt		—		578
		$	483,189	$	143,928
	The Corporation’s banking affiliate has available credit with the FHLB of $3,840,436 of which $850,056 was used as of September 30, 2014. These advances are secured by loans collateralized by residential mortgages, HELOCs, commercial real estate and FHLB stock and are scheduled to mature in various amounts periodically through the year 2021. Effective interest rates paid on these advances ranged from 0.26% to 4.19% for the nine months ended September 30, 2014 and 1.06% to 4.19% for the year ended December 31, 2013.

Junior_Subordinated_Debt

Junior Subordinated Debt

9 Months Ended

Sep. 30, 2014

Text Block [Abstract]

'

Junior Subordinated Debt

'

JUNIOR SUBORDINATED DEBT

The Corporation has two unconsolidated subsidiary trusts as of September 30, 2014 (collectively, the Trusts): F.N.B. Statutory Trust II and Omega Financial Capital Trust I. One hundred percent of the common equity of each Trust is owned by the Corporation. The Trusts were formed for the purpose of issuing Corporation-obligated mandatorily redeemable capital securities (TPS) to third-party investors. The proceeds from the sale of TPS and the issuance of common equity by the Trusts were invested in junior subordinated debt securities (subordinated debt) issued by the Corporation, which are the sole assets of each Trust. Since third-party investors are the primary beneficiaries, the Trusts are not consolidated in the Corporation’s financial statements. The Trusts pay dividends on the TPS at the same rate as the distributions paid by the Corporation on the junior subordinated debt held by the Trusts. Omega Financial Capital Trust I was assumed as a result of an acquisition.

Distributions on the subordinated debt issued to the Trusts are recorded as interest expense by the Corporation. The TPS are subject to mandatory redemption, in whole or in part, upon repayment of the subordinated debt. The TPS are eligible for redemption, at any time, at the Corporation’s discretion. The subordinated debt, net of the Corporation’s investment in the Trusts, qualifies as tier 1 capital under the Board of Governors of the Federal Reserve System (FRB) guidelines. Under recently issued capital guidelines, these TPS obligations are subject to limitations when total assets of the Corporation exceed $15,000,000. The Corporation has entered into agreements which, when taken collectively, fully and unconditionally guarantee the obligations under the TPS subject to the terms of each of the guarantees.

During the first nine months of 2014, the Corporation redeemed $33,000 of the Corporation-issued TPS, including $16,500 that the Corporation assumed as a result of the BCSB acquisition. During 2013, the Corporation redeemed $130,000 of the Corporation-issued TPS. The Corporation proactively redeemed these Corporation-issued TPS, primarily using proceeds from the November 2013 capital raise, in anticipation of meeting the limitations as described above. Under applicable regulatory capital guidelines issued by the bank regulatory agencies, upon notice of redemption, the redeemed TPS no longer qualify as tier 1 capital for the Corporation.

The following table provides information relating to the Trusts as of September 30, 2014:

Trust

Common

Junior

Stated

Interest

Preferred

Securities

Subordinated

Maturity

Rate

Securities

Debt

Date

F.N.B. Statutory Trust II

$

21,500

$

665

$

22,165

6/15/36

1.88

%

Variable; LIBOR + 165 basis points (bps)

Omega Financial Capital Trust I

36,000

1,114

36,068

10/18/34

2.42

%

Variable; LIBOR + 219 bps

$

57,500

$

1,779

$

58,233

Derivative_Instruments

Derivative Instruments	9 Months Ended
	Sep. 30, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Derivative Instruments	'
	DERIVATIVE INSTRUMENTS
	The Corporation is exposed to certain risks arising from both its business operations and economic conditions. The Corporation principally manages its exposures to a wide variety of business and operational risks through management of its core business activities. The Corporation manages economic risks, including interest rate risk, primarily by managing the amount, source, and duration of its assets and liabilities, and through the use of derivative instruments. Interest rate swaps are the primary derivative instrument used by the Corporation for interest rate risk management. The Corporation also uses derivative instruments to facilitate transactions on behalf of its customers.
	Commercial Borrower Derivatives
	The Corporation enters into interest rate swap agreements to meet the financing, interest rate and equity risk management needs of qualifying commercial loan customers. These agreements provide the customer the ability to convert from variable to fixed interest rates. The Corporation then enters into positions with a derivative counterparty in order to offset its exposure on the fixed components of the customer agreements. The credit risk associated with derivatives executed with customers is essentially the same as that involved in extending loans and is subject to normal credit policies and monitoring. The Corporation seeks to minimize counterparty credit risk by entering into transactions with only high-quality institutions. Since June 10, 2014, the majority of the Corporation’s derivative transactions are executed through CME Clearing, a SEC registered clearing agency, whose purpose is to ensure safety and soundness in the markets, rather than directly with a counterparty. These arrangements meet the definition of derivatives, but are not designated as hedging instruments under ASC 815, Derivatives and Hedging. The interest rate swap agreement with the loan customer and with the counterparty is reported at fair value in other assets and other liabilities on the consolidated balance sheet with any resulting gain or loss recorded in current period earnings as other income or other expense.
	Risk Management Derivatives
	The Corporation entered into interest rate derivative agreements in order to manage its net interest income by increasing the stability of the net interest income over a range of potential interest rate scenarios. Interest rate swaps are also used to modify the interest rate characteristics of designated commercial loans from variable rate to fixed rate in order to reduce the impact of changes in future cash flows due to interest rate changes. These agreements are designated as cash flow hedges (i.e., hedging the exposure to variability in expected future cash flows). The effective portion of the derivative’s gain or loss is initially reported as a component of other comprehensive income and subsequently reclassified into earnings in the same line item associated with the forecasted transaction when the forecasted transaction affects earnings. The ineffective portion of the gain or loss is reported in earnings immediately. Gains and losses from hedge ineffectiveness recognized in the consolidated statement of comprehensive income were not material for the nine months ended September 30, 2014.
	In accordance with the requirements of ASU No. 2011-04, the Corporation made an accounting policy election to use the portfolio exception with respect to measuring derivative instruments, consistent with the guidance in ASC 820. The Corporation further documents that it meets the criteria for this exception as follows:
		•		The Corporation manages credit risk for its derivative positions on a counterparty-by-counterparty basis, consistent with its risk management strategy for such transactions. The Corporation manages credit risk by considering indicators of risk such as credit ratings, and by negotiating terms in its master netting arrangements and credit support annex documentation with each individual counterparty. Review of credit risk plays a central role in the decision of which counterparties to consider for such relationships and when deciding with whom it will enter into derivative transactions.
		•		Since the effective date of ASC 820, the Corporation’s management has monitored and measured credit risk and calculated credit valuation adjustments (CVAs) for its derivative transactions on a counterparty-by-counterparty basis. Management receives reports from an independent third-party valuation specialist on a monthly basis to assist in determining CVAs by counterparty for purposes of reviewing and managing its credit risk exposures. Since the portfolio exception applies only to the fair value measurement and not to the financial statement presentation, the portfolio-level adjustments are then allocated in a reasonable and consistent manner each period to the individual assets or liabilities that make up the counterparty derivative portfolio, in accordance with the Corporation’s accounting policy elections.
	The Corporation notes that key market participants take into account the existence of such arrangements that mitigate credit risk exposure in the event of default. As such, the Corporation formally elects to apply the portfolio exception in ASC 820 with respect to measuring counterparty credit risk for all of its derivative transactions subject to master netting arrangements.
	At September 30, 2014, the Corporation was party to 330 swaps with customers with notional amounts totaling $950,427 and 296 swaps with derivative counterparties with notional amounts totaling $1,150,427.
	Derivative assets are classified in the balance sheet under “other assets” and derivative liabilities are classified in the balance sheet under “other liabilities.” The following tables present information about derivative assets and derivative liabilities that are subject to enforceable master netting agreements as well as those not subject to enforceable master netting arrangements:
			Gross		Gross			Net Amount
			Amount		Amounts			Presented in
					Offset in			the Balance
					the Balance			Sheet
					Sheet
	Offsetting of Derivative Assets:
	September 30, 2014
	Derivative assets subject to master netting arrangement:
	Interest rate contracts		$	1,698		—		$	1,698
	Equity contracts			50		—			50
	Derivative assets not subject to master netting arrangement:
	Interest rate contracts			32,880		—			32,880
	Total derivative assets		$	34,628		—		$	34,628
	December 31, 2013
	Derivative assets subject to master netting arrangement:
	Interest rate contracts		$	3,547		—		$	3,547
	Equity contracts			32		—			32
	Derivative assets not subject to master netting arrangement:
	Interest rate contracts			29,738		—			29,738
	Total derivative assets		$	33,317		—		$	33,317
	Offsetting of Derivative Liabilities:
	September 30, 2014
	Derivative liabilities subject to master netting arrangement:
	Interest rate contracts		$	37,565		—		$	37,565
	Derivative liabilities not subject to master netting arrangement:
	Interest rate contracts			1,040		—			1,040
	Equity contracts			50		—			50
	Total derivative liabilities		$	38,655		—		$	38,655
	December 31, 2013
	Derivative liabilities subject to master netting arrangement:
	Interest rate contracts		$	40,323		—		$	40,323
	Derivative liabilities not subject to master netting arrangement:
	Interest rate contracts			3,014		—			3,014
	Equity contracts			32		—			32
	Total derivative liabilities		$	43,369		—		$	43,369
	The following tables present a reconciliation of the net amounts of derivative assets and derivative liabilities presented in the balance sheet to the net amounts that would result in the event of offset:
					Gross Amounts Not Offset in the
					Balance Sheet
			Net Amount		Financial			Cash		Net Amount
			Presented in the		Instruments			Collateral
			Balance Sheet					Received
	Derivative Assets:
	September 30, 2014
	Counterparty B		$	30	$	30		$	—		—
	Counterparty D			67		67			—		—
	Counterparty E			657		657			—		—
	Counterparty F			137		137			—		—
	Counterparty G			71		71			—		—
	Counterparty I			232		232			—		—
	Counterparty J			554		—			554		—
			$	1,748	$	1,194		$	554		—
December 31, 2013
Counterparty B		$	24	$	24		$	—	$	—
Counterparty D			566		566			—		—
Counterparty E			1,696		1,696			—		—
Counterparty F			355		273			—		82
Counterparty G			251		251			—		—
Counterparty I			634		634			—		—
Counterparty J			53		—			53		—
		$	3,579	$	3,444		$	53	$	82
Derivative Liabilities:
September 30, 2014
Counterparty A		$	4,033	$	4,033		$	—	$	—
Counterparty B			1,882		1,882			—		—
Counterparty C			1,160		1,160			—		—
Counterparty D			7,105		7,105			—		—
Counterparty E			3,509		3,509			—		—
Counterparty F			719		667			—		52
Counterparty G			4,146		4,146			—		—
Counterparty H			1,761		—			—		1,761
Counterparty I			5,399		5,399			—		—
Counterparty J			7,851		—			7,851		—
		$	37,565	$	27,901		$	7,851	$	1,813
December 31, 2013
Counterparty A		$	4,934	$	4,934		$	—	$	—
Counterparty B			3,249		3,249			—		—
Counterparty C			1,431		1,431			—		—
Counterparty D			9,614		9,614			—		—
Counterparty E			6,257		6,257			—		—
Counterparty F			13		13			—		—
Counterparty G			5,309		5,309			—		—
Counterparty H			2,257		125			—		2,132
Counterparty I			5,649		5,649			—		—
Counterparty J			1,610		—			1,610		—
		$	40,323	$	36,581		$	1,610	$	2,132
The following table presents the effect of the Corporation’s derivative financial instruments on the income statement:
		Income		Nine Months Ended
		Statement		September 30,
		Location		2014			2013
Interest Rate Products			Other income	$	(9	)	$	40
The Corporation has agreements with each of its derivative counterparties that contain a provision where if the Corporation defaults on any of its indebtedness, including default where repayment of the indebtedness has not been accelerated by the lender, then the Corporation could also be declared in default on its derivative obligations. The Corporation also has agreements with certain of its derivative counterparties that contain a provision that if the Corporation fails to maintain its status as a well-capitalized institution, then the counterparty could terminate the derivative positions and the Corporation would be required to settle its obligations under the agreements. Certain of the Corporation’s agreements with its derivative counterparties contain provisions where if a material or adverse change occurs that materially changes the Corporation’s creditworthiness in an adverse manner, the Corporation may be required to fully collateralize its obligations under the derivative instrument.
Interest rate swap agreements generally require posting of collateral by either party under certain conditions. As of September 30, 2014 and December 31, 2013, the fair value of counterparty derivatives in a net liability position, which includes accrued interest but excludes any adjustment for non-performance risk related to these agreements, was $37,100 and $38,239, respectively. At September 30, 2014, the Corporation has posted collateral with derivative counterparties with a fair value of $29,796 and cash collateral of $10,986. At December 31, 2013, the Corporation had posted collateral with derivative counterparties with a fair value of $37,427 and cash collateral of $1,976. Additionally, if the Corporation had breached its agreements with its derivative counterparties it would be required to settle its obligations under the agreements at the termination value and would be required to pay an additional $1,963 and $2,224 as of September 30, 2014 and December 31, 2013, respectively, in excess of amounts previously posted as collateral with the respective counterparty.
The Corporation has entered into interest rate lock commitments to originate residential mortgage loans held for sale and forward commitments to sell residential mortgage loans to secondary market investors. These arrangements are considered derivative instruments. The fair values of the Corporation’s rate lock commitments to customers and commitments with investors at September 30, 2014 and December 31, 2013 are not material.

Commitments_Credit_Risk_and_Co

Commitments, Credit Risk and Contingencies	9 Months Ended
	Sep. 30, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Commitments, Credit Risk and Contingencies	'
	COMMITMENTS, CREDIT RISK AND CONTINGENCIES
	The Corporation has commitments to extend credit and standby letters of credit that involve certain elements of credit risk in excess of the amount stated in the consolidated balance sheet. The Corporation’s exposure to credit loss in the event of non-performance by the customer is represented by the contractual amount of those instruments. The credit risk associated with loan commitments and standby letters of credit is essentially the same as that involved in extending loans to customers and is subject to normal credit policies. Since many of these commitments expire without being drawn upon, the total commitment amounts do not necessarily represent future cash flow requirements.
	Following is a summary of off-balance sheet credit risk information:
		September 30,		December 31,
		2014		2013
	Commitments to extend credit	$	3,445,792	$	2,897,748
	Standby letters of credit		122,290		114,298
	At September 30, 2014, funding of 74.2% of the commitments to extend credit was dependent on the financial condition of the customer. The Corporation has the ability to withdraw such commitments at its discretion. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. Based on management’s credit evaluation of the customer, collateral may be deemed necessary. Collateral requirements vary and may include accounts receivable, inventory, property, plant and equipment and income-producing commercial properties.
	Standby letters of credit are conditional commitments issued by the Corporation that may require payment at a future date. The credit risk involved in issuing letters of credit is quantified on a quarterly basis, through the review of historical performance of the Corporation’s portfolios and allocated as a liability on the Corporation’s balance sheet.
	Other Legal Proceedings
	The Corporation and its subsidiaries are involved in various pending and threatened legal proceedings in which claims for monetary damages and other relief are asserted. These actions include claims brought against the Corporation and its subsidiaries where the Corporation or a subsidiary acted as one or more of the following: a depository bank, lender, underwriter, fiduciary, financial advisor, broker or was engaged in other business activities. Although the ultimate outcome for any asserted claim cannot be predicted with certainty, the Corporation believes that it and its subsidiaries have valid defenses for all asserted claims. Reserves are established for legal claims when losses associated with the claims are judged to be probable and the amount of the loss can be reasonably estimated.
	Based on information currently available, advice of counsel, available insurance coverage and established reserves, the Corporation does not anticipate, at the present time, that the aggregate liability, if any, arising out of such legal proceedings will have a material adverse effect on the Corporation’s consolidated financial position. However, the Corporation cannot determine whether or not any claims asserted against it will have a material adverse effect on its consolidated results of operations in any future reporting period.
	OBA Financial Services, Inc. Stockholder Litigation
	On May 7, 2014, a purported shareholder of OBA filed a putative class action complaint in the Circuit Court for Montgomery County, Maryland, captioned Parshall v. OBA Financial Services, Inc., et al., Case No. 390369V, and naming as defendants OBA, OBA Bank, OBA’s board of directors, the. Corporation and FNBPA. The plaintiff alleged that OBA’s board of directors breached its fiduciary duty to OBA’s shareholders by approving a proposed transaction containing certain so-called “deal protection devices” and, as a result, OBA’s shareholders allegedly would not receive fair value for their stock. The plaintiff further alleged that OBA, OBA Bank, the Corporation and FNBPA aided and abetted the alleged breaches of fiduciary duty by the OBA board. On July 3, 2014, the plaintiff filed an amended complaint with additional allegations regarding certain purported nondisclosures relating to the registration statement for the proposed transaction.
	The plaintiff sought an injunction barring the defendants from completing the merger; rescission of the merger agreement to the extent already implemented or, in the alternative, an award of rescissory damages; an accounting to plaintiff for all damages caused by the defendants; and an award of the costs and expenses incurred by the plaintiff in the lawsuit, including a reasonable allowance for counsel fees and expert fees.
	On September 15, 2014, the plaintiff voluntarily dismissed his complaint.

Stock_Incentive_Plans

Stock Incentive Plans	9 Months Ended
	Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Stock Incentive Plans	'
	STOCK INCENTIVE PLANS
	Restricted Stock
	The Corporation issues restricted stock awards, consisting of both restricted stock and restricted stock units, to key employees under its Incentive Compensation Plans (Plans). Beginning in 2014, the Corporation issues time-based awards and performance-based awards under these Plans, both of which are based on a three-year vesting period. The grant date fair value of the time-based awards is equal to the price of the Corporation’s common stock on the grant date. The grant date fair value of the performance-based awards is based on total shareholder return compared to peers. The amount of expense for the performance-based awards is fixed, regardless of how much of the awards ultimately vest.
	Prior to 2014, the grant date fair value of the restricted stock awards under these Plans was equal to the price of the Corporation’s common stock on the grant date. More than half of the restricted stock awards granted to management were earned if the Corporation met or exceeded certain financial performance results when compared to its peers. These performance-related awards were expensed ratably from the date that the likelihood of meeting the performance measure was probable through the end of a four-year vesting period. The service-based awards were expensed ratably over a three-year vesting period. The Corporation also issued discretionary service-based awards to certain employees that vested over five years.
	For the nine months ended September 30, 2014 and 2013, the Corporation issued 364,065 and 344,479 restricted stock awards, respectively, with aggregate weighted average grant date fair values of $4,954 and $3,802, respectively, under these Plans. As of September 30, 2014, the Corporation had available up to 2,419,585 shares of common stock to issue under these Plans.
	The unvested restricted stock awards are eligible to receive cash dividends or dividend equivalents which are ultimately used to purchase additional shares of stock. Any additional shares of stock received as a result of cash dividends are subject to forfeiture if the requisite service period is not completed or the specified performance criteria are not met. These awards are subject to certain accelerated vesting provisions upon retirement, death, disability or in the event of a change of control as defined in the award agreements.
	Share-based compensation expense related to restricted stock awards was $2,294 and $3,338 for the nine months ended September 30, 2014 and 2013, the tax benefit of which was $803 and $1,186, respectively.
	The following table summarizes certain information concerning restricted stock awards:
		Nine Months Ended September 30,
		2014					2013
		Awards			Weighted		Awards			Weighted
					Average					Average
					Grant					Grant
					Price					Price
	Unvested awards outstanding at beginning of period		1,729,033		$	10.23		1,913,073		$	9.17
	Granted		364,065			13.61		344,479			11.04
	Net adjustment due to performance		(87,512	)		11.41		73,835			10.6
	Vested		(703,428	)		8.79		(734,129	)		7.6
	Forfeited		(50,849	)		11.47		(37,175	)		10.4
	Dividend reinvestment		34,521			12.73		43,934			11.66
	Unvested awards outstanding at end of period		1,285,830			11.9		1,604,017			10.26
	The total fair value of awards vested was $10,670 and $8,259 for the nine months ended September 30, 2014 and 2013, respectively.
	As of September 30, 2014, there was $5,950 of unrecognized compensation cost related to unvested restricted stock awards, including $71 that is subject to accelerated vesting under the Plan’s immediate vesting upon retirement provision for awards granted prior to the adoption of ASC 718, Compensation – Stock Compensation. The components of the restricted stock awards as of September 30, 2014 are as follows:
		Service-			Performance-		Total
		Based			Based
		Awards			Awards
	Unvested awards		498,890			786,940		1,285,830
	Unrecognized compensation expense	$	3,367		$	2,583	$	5,950
	Intrinsic value	$	5,982		$	9,435	$	15,417
	Weighted average remaining life (in years)		2.26			2.1		2.16
	Stock Options
	All outstanding stock options were assumed from acquisitions and are fully vested. The Corporation issues shares of treasury stock or authorized but unissued shares to satisfy stock options exercised. Shares issued upon the exercise of stock options were 135,417 and 36,647 for the nine months ended September 30, 2014 and 2013, respectively.
	The following table summarizes certain information concerning stock option awards:
		Nine Months Ended September 30,
		2014					2013
		Shares			Weighted		Shares			Weighted
					Average					Average
					Exercise					Exercise
					Price					Price
	Options outstanding at beginning of period		533,524		$	11.5		640,050		$	13.21
	Assumed from acquisition		805,507			7.39		19,223			7.92
	Exercised		(140,817	)		6.21		(36,647	)		8.9
	Forfeited		(54,962	)		24.41		(298,150	)		15.1
	Options outstanding and exercisable at end of period		1,143,252			8.64		324,476			11.65
	The intrinsic value of outstanding and exercisable stock options at September 30, 2014 was $4,413.
	Warrants
	In conjunction with its participation in the UST’s CPP, the Corporation issued to the UST a warrant to purchase up to 1,302,083 shares of the Corporation’s common stock. Pursuant to Section 13(H) of the Warrant to Purchase Common Stock, the number of shares of common stock issuable upon exercise of the warrant was reduced in half to 651,042 shares on June 16, 2009, the date the Corporation completed a public offering. The warrant, which expires in 2019, has an exercise price of $11.52 per share.
	In conjunction with the Parkvale Financial Corporation (Parkvale) acquisition on January 1, 2012, the warrant issued by Parkvale to the UST under the CPP has been converted into a warrant to purchase up to 819,640 shares of the Corporation’s common stock. This warrant, which was recorded at its fair value on January 1, 2012, expires in 2018 and has an exercise price of $5.81 per share.
	In conjunction with the ANNB acquisition, the warrant issued by ANNB to the UST under the CPP has been converted into a warrant to purchase up to 342,564 shares of the Corporation’s common stock. The warrant, which was recorded at its fair value on April 6, 2013, expires in 2019 and has an exercise price of $3.57 per share.

Retirement_Plans

Retirement Plans	9 Months Ended
	Sep. 30, 2014
Compensation and Retirement Disclosure [Abstract]	'
Retirement Plans	'
	RETIREMENT PLANS
	The Corporation sponsors the Retirement Income Plan (RIP), a qualified noncontributory defined benefit pension plan that covered substantially all salaried employees hired prior to January 1, 2008. The RIP covers employees who satisfied minimum age and length of service requirements. During 2006, the Corporation amended the RIP such that effective January 1, 2007 benefits were earned based on the employee’s compensation each year. The Corporation’s funding guideline has been to make annual contributions to the RIP each year, if necessary, such that minimum funding requirements have been met. The RIP was frozen as of December 31, 2010.
	The Corporation also sponsors two supplemental non-qualified retirement plans. The ERISA Excess Retirement Plan provides retirement benefits equal to the difference, if any, between the maximum benefit allowable under the Internal Revenue Code and the amount that would be provided under the RIP, if no limits were applied. The Basic Retirement Plan (BRP) is applicable to certain officers whom the Board of Directors designates. Officers participating in the BRP receive a benefit based on a target benefit percentage based on years of service at retirement and a designated tier as determined by the Board of Directors. When a participant retires, the basic benefit under the BRP is a monthly benefit equal to the target benefit percentage times the participant’s highest average monthly cash compensation during five consecutive calendar years within the last ten calendar years of employment. This monthly benefit was reduced by the monthly benefit the participant receives from Social Security, the RIP, the ERISA Excess Retirement Plan and the annuity equivalent of the three percent automatic contributions to the qualified 401(k) defined contribution plan and the ERISA Excess Lost Match Plan. The BRP was frozen as of December 31, 2008. The ERISA Excess Retirement Plan was frozen as of December 31, 2010.
	The net periodic benefit credit for the defined benefit plans includes the following components:
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2014			2013			2014			2013
	Service cost	$	15		$	15		$	47		$	51
	Interest cost		1,610			1,437			4,802			4,291
	Expected return on plan assets		(2,486	)		(2,271	)		(7,460	)		(6,811	)
	Amortization:
	Unrecognized net transition asset		(6	)		(24	)		(16	)		(70	)
	Unrecognized prior service cost		2			2			6			6
	Unrecognized loss		347			575			1,021			1,689
	Net periodic pension credit	$	(518	)	$	(266	)	$	(1,600	)	$	(844	)
	The Corporation’s subsidiaries participate in a qualified 401(k) defined contribution plan under which employees may contribute a percentage of their salary. Employees are eligible to participate upon their first day of employment. Under this plan, the Corporation matches 100% of the first four percent that the employee defers. Additionally, substantially all employees receive an automatic contribution of three percent of compensation at the end of the year and the Corporation may make an additional contribution of up to two percent depending on the Corporation achieving its performance goals for the plan year. The Corporation’s contribution expense was $7,595 and $6,975 for the nine months ended September 30, 2014 and 2013, respectively.
	The Corporation also sponsors an ERISA Excess Lost Match Plan for certain officers. This plan provides retirement benefits equal to the difference, if any, between the maximum benefit allowable under the Internal Revenue Code and the amount that would have been provided under the qualified 401(k) defined contribution plan, if no limits were applied.

Income_Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2014
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	INCOME TAXES
	The Corporation bases its provision for income taxes upon income before income taxes, adjusted for the effect of certain tax-exempt income and non-deductible expenses. In addition, the Corporation reports certain items of income and expense in different periods for financial reporting and tax return purposes. The Corporation recognizes the tax effects of these temporary differences currently in the deferred income tax provision or benefit. The Corporation computes deferred tax assets or liabilities based upon the differences between the financial statement and income tax bases of assets and liabilities using the applicable marginal tax rate.
	The Corporation must evaluate the probability that it will ultimately realize the full value of its deferred tax assets. Realization of the Corporation’s deferred tax assets is dependent upon a number of factors including the existence of any cumulative losses in prior periods, the amount of taxes paid in available carry-back periods, expectations for future earnings, applicable tax planning strategies and assessment of current and future economic and business conditions. The Corporation establishes a valuation allowance when it is “more likely than not” that the Corporation will not be able to realize a benefit from its deferred tax assets, or when future deductibility is uncertain.
	At September 30, 2014, the Corporation anticipates that it will not utilize state net operating loss carryforwards and other net deferred tax assets at certain of its subsidiaries and has recorded a valuation allowance against the state deferred tax assets. The Corporation believes that, except for the portion which is covered by the valuation allowance, it is more likely than not the Corporation will realize the benefits of its deferred tax assets, net of the valuation allowance, at September 30, 2014, based on the level of historical taxable income and taxes paid in available carry-back periods.

Comprehensive_Income

Comprehensive Income	9 Months Ended
	Sep. 30, 2014
Equity [Abstract]	'
Comprehensive Income	'
	COMPREHENSIVE INCOME
	The components of comprehensive income, net of related tax, are as follows:
			Three Months Ended						Nine Months Ended
			September 30,						September 30,
			2014			2013			2014			2013
	Net income		$	35,391		$	31,634		$	104,746		$	89,365
	Other comprehensive (loss) income:
	Securities available for sale:
	Unrealized (losses) gains arising during the period, net of tax (benefit) expense of $(1,551), $(2,635), $7,065 and $(8,835)			(2,881	)		(4,894	)		13,120			(16,408	)
	Reversal of non-credit related losses on debt securities not expected to be sold, net of tax expense of $3,335			—			—			6,192			—
	Reclassification adjustment for gains included in net income, net of tax expense of $412, $2, $3,995 and $260			(766	)		(3	)		(7,420	)		(483	)
	Derivative instruments:
	Unrealized (losses) gains arising during the period, net of tax (benefit) expense of $(253), $239, $2,112 and $(2,215)			(469	)		443			3,922			(4,113	)
	Pension and postretirement benefit obligations:
	Unrealized gains arising during the period, net of tax expense of $121, $194, $355 and $569			224			360			659			1,057
	Other comprehensive (loss) income			(3,892	)		(4,094	)		16,473			(19,947	)
	Comprehensive income		$	31,499		$	27,540		$	121,219		$	69,418
	The following table presents changes in accumulated other comprehensive income, net of tax, by component:
			Unrealized			Non-Credit			Unrealized			Unrecognized			Total
			Net Gains			Related Loss			Losses on			Pension and
			(Losses) on			on Debt			Derivative			Postretirement
			Securities			Securities not			Instruments			Obligations
			Available			Expected to
			for Sale			be Sold
	Nine Months Ended September 30, 2014
	Balance at beginning of period		$	(11,874	)	$	(6,192	)	$	(6,586	)	$	(32,272	)	$	(56,924	)
	Other comprehensive income (loss) before reclassifications			13,120			6,192			3,922			659			23,893
	Amounts reclassified from accumulated other comprehensive income			(7,420	)		—			—			—			(7,420	)
	Net current period other comprehensive income (loss)			5,700			6,192			3,922			659			16,473
	Balance at end of period		$	(6,174	)	$	—		$	(2,664	)	$	(31,613	)	$	(40,451	)
	The following table presents a summary of the reclassifications out of accumulated other comprehensive income:
	Nine Months Ended September 30, 2014
	Details About Accumulated Other		Amount			Affected Line Item
			Reclassified from			in the Statement
	Comprehensive Income Component		Other			where Net Income
			Comprehensive			is Presented
			Income
	Unrealized net gains on securities available for sale (1)		$	(11,415	)	Net securities gains
				(3,995	)	Tax expense
			$	(7,420	)
	-1	For additional detail related to unrealized net gains on securities available for sale and related amounts reclassified from accumulated other comprehensive income see the “Securities” note in this Report.

Earnings_Per_Common_Share

Earnings Per Common Share	9 Months Ended
	Sep. 30, 2014
Earnings Per Share [Abstract]	'
Earnings Per Common Share	'
	EARNINGS PER COMMON SHARE
	Basic earnings per common share is calculated by dividing net income available to common stockholders by the weighted average number of shares of common stock outstanding net of unvested shares of restricted stock.
	Diluted earnings per common share is calculated by dividing net income available to common stockholders by the weighted average number of shares of common stock outstanding, adjusted for the dilutive effect of potential common shares issuable for stock options, warrants and restricted shares, as calculated using the treasury stock method. Adjustments to the weighted average number of shares of common stock outstanding are made only when such adjustments dilute earnings per common share.
	The following table sets forth the computation of basic and diluted earnings per common share:
		Three Months Ended				Nine Months Ended
		September 30,				September 30,
		2014		2013		2014		2013
	Net income	$	35,391	$	31,634	$	104,746	$	89,365
	Less: Preferred stock dividends		2,010		—		6,342		—
	Net income available to common stockholders	$	33,381	$	31,634	$	98,404	$	89,365
	Basic weighted average common shares outstanding		167,260,386		144,759,887		165,229,206		142,949,134
	Net effect of dilutive stock options, warrants, restricted stock and convertible debt		1,623,741		1,686,555		1,695,637		1,520,683
	Diluted weighted average common shares outstanding		168,884,127		146,446,442		166,924,843		144,469,817
	Earnings per common share:
	Basic	$	0.2	$	0.22	$	0.6	$	0.63
	Diluted	$	0.2	$	0.22	$	0.59	$	0.62
	For the three months ended September 30, 2014 and 2013, 32,419 and 17,081 shares of common stock, respectively, related to stock options and warrants were excluded from the computation of diluted earnings per common share because the exercise price of the shares was greater than the average market price of the common shares and, therefore, the effect would be anti-dilutive. For the nine months ended September 30, 2014 and 2013, 38,151 and 41,779 shares of common stock, respectively, related to stock options and warrants were excluded from the computation of diluted earnings per common share because the exercise price of the shares was greater than the average market price of the common shares and, therefore, the effect would be anti-dilutive.

Cash_Flow_Information

Cash Flow Information	9 Months Ended
	Sep. 30, 2014
Supplemental Cash Flow Elements [Abstract]	'
Cash Flow Information	'
	CASH FLOW INFORMATION
	Following is a summary of supplemental cash flow information:
	Nine Months Ended September 30	2014		2013
	Interest paid on deposits and other borrowings	$	31,804	$	36,340
	Income taxes paid		17,000		18,700
	Transfers of loans to other real estate owned		7,784		10,856
	Financing of other real estate owned sold		287		549

Business_Segments

Business Segments	9 Months Ended
	Sep. 30, 2014
Segment Reporting [Abstract]	'
Business Segments	'
	BUSINESS SEGMENTS
	The Corporation operates in four reportable segments: Community Banking, Wealth Management, Insurance and Consumer Finance.
		•		The Community Banking segment provides commercial and consumer banking services. Commercial banking solutions include corporate banking, small business banking, investment real estate financing, asset based lending, capital markets and lease financing. Consumer banking products and services include deposit products, mortgage lending, consumer lending and a complete suite of mobile and online banking services.
		•		The Wealth Management segment provides a broad range of personal and corporate fiduciary services including the administration of decedent and trust estates. In addition, it offers various alternative products, including securities brokerage and investment advisory services, mutual funds and annuities.
		•		The Insurance segment includes a full-service insurance agency offering all lines of commercial and personal insurance through major carriers. The Insurance segment also includes a reinsurer.
		•		The Consumer Finance segment primarily makes installment loans to individuals and purchases installment sales finance contracts from retail merchants. The Consumer Finance segment activity is funded through the sale of the Corporation’s subordinated notes at the finance company’s branch offices.
	The following tables provide financial information for these segments of the Corporation. The information provided under the caption “Parent and Other” represents operations not considered to be reportable segments and/or general operating expenses of the Corporation, and includes the parent company, other non-bank subsidiaries and eliminations and adjustments which are necessary for purposes of reconciliation to the consolidated amounts.
			Community		Wealth		Insurance		Consumer		Parent and			Consolidated
			Banking		Management				Finance		Other
	At or for the Three Months Ended September 30, 2014
	Interest income		$	120,122	$	—	$	24	$	9,773	$	1,647		$	131,566
	Interest expense			9,435		—		—		826		686			10,947
	Net interest income			110,687		—		24		8,947		961			120,619
	Provision for loan losses			9,427		—		—		1,519		251			11,197
	Non-interest income			27,179		8,174		3,373		719		(1,893	)		37,552
	Non-interest expense			79,243		6,294		2,943		4,983		(71	)		93,392
	Intangible amortization			2,282		72		101		—		—			2,455
	Income tax expense (benefit)			14,347		656		128		1,216		(611	)		15,736
	Net income (loss)			32,567		1,152		225		1,948		(501	)		35,391
	Total assets			15,584,832		21,892		19,148		182,301		(51,128	)		15,757,045
	Total intangibles			856,464		10,792		10,223		1,809		—			879,288
			Community		Wealth		Insurance		Consumer		Parent and			Consolidated
			Banking		Management				Finance		Other
	At or for the Three Months Ended September 30, 2013
	Interest income		$	98,716	$	—	$	27	$	9,600	$	1,447		$	109,790
	Interest expense			7,552		—		—		839		2,145			10,536
	Net interest income			91,164		—		27		8,761		(698	)		99,254
	Provision for loan losses			5,432		—		—		1,725		123			7,280
	Non-interest income			24,317		6,916		3,222		681		(2,326	)		32,810
	Non-interest expense			68,091		5,850		2,799		4,724		(358	)		81,106
	Intangible amortization			1,890		76		101		—		—			2,067
	Income tax expense (benefit)			9,552		366		128		1,145		(1,214	)		9,977
	Net income (loss)			30,516		624		221		1,848		(1,575	)		31,634
	Total assets			12,610,043		19,614		19,788		182,695		(41,861	)		12,790,279
	Total intangibles			725,389		11,084		10,627		1,809		—			748,909
	At or for the Nine Months Ended September 30, 2014
	Interest income		$	339,974	$	—	$	74	$	28,716	$	5,122		$	373,886
	Interest expense			26,413		—		—		2,481		2,356			31,250
	Net interest income			313,561		—		74		26,235		2,766			342,636
	Provision for loan losses			23,148		—		—		4,754		706			28,608
	Non-interest income			86,512		23,530		10,582		2,120		(3,932	)		118,812
	Non-interest expense			231,390		19,038		8,900		14,800		1,270			275,398
	Intangible amortization			6,680		216		303		—		—			7,199
	Income tax expense (benefit)			41,738		1,555		521		3,386		(1,703	)		45,497
	Net income (loss)			97,117		2,721		932		5,415		(1,439	)		104,746
	Total assets			15,584,832		21,892		19,148		182,301		(51,128	)		15,757,045
	Total intangibles			856,454		10,792		10,223		1,809		—			879,288
	At or for the Nine Months Ended September 30, 2013
	Interest income		$	289,984	$	—	$	82	$	27,920	$	4,763		$	322,749
	Interest expense			24,449		—		—		2,533		6,671			33,653
	Net interest income			265,535		—		82		25,387		(1,908	)		289,096
	Provision for loan losses			17,283		—		—		4,930		511			22,724
	Non-interest income			73,955		21,294		10,024		2,029		(4,183	)		103,119
	Non-interest expense			198,395		18,338		8,420		14,063		823			240,039
	Intangible amortization			5,531		228		304		—		—			6,063
	Income tax expense (benefit)			32,486		1,009		497		3,234		(3,202	)		34,024
	Net income (loss)			85,795		1,719		885		5,189		(4,223	)		89,365
	Total assets			12,610,043		19,614		19,788		182,695		(41,861	)		12,790,279
	Total intangibles			725,389		11,084		10,627		1,809		—			748,909

Fair_Value_Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2014
Fair Value Disclosures [Abstract]	'
Fair Value Measurements	'
	FAIR VALUE MEASUREMENTS
	The Corporation uses fair value measurements to record fair value adjustments to certain financial assets and liabilities and to determine fair value disclosures. Securities available for sale and derivatives are recorded at fair value on a recurring basis. Additionally, from time to time, the Corporation may be required to record at fair value other assets on a non-recurring basis, such as mortgage loans held for sale, certain impaired loans, OREO and certain other assets.
	Fair value is defined as an exit price, representing the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Fair value measurements are not adjusted for transaction costs. Fair value is a market-based measure considered from the perspective of a market participant who holds the asset or owes the liability rather than an entity-specific measure.
	In determining fair value, the Corporation uses various valuation approaches, including market, income and cost approaches. ASC 820, Fair Value Measurements and Disclosures, establishes a hierarchy for inputs used in measuring fair value that maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that observable inputs be used when available. Observable inputs are inputs that market participants would use in pricing the asset or liability, which are developed based on market data obtained from sources independent of the Corporation. Unobservable inputs reflect the Corporation’s assumptions about the assumptions that market participants would use in pricing an asset or liability, which are developed based on the best information available in the circumstances.
	The fair value hierarchy gives the highest priority to unadjusted quoted market prices in active markets for identical assets or liabilities (Level 1 measurement) and the lowest priority to unobservable inputs (Level 3 measurement). The fair value hierarchy is broken down into three levels based on the reliability of inputs as follows:
	Measurement	Definition
	Category
	Level 1	valuation is based upon unadjusted quoted market prices for identical instruments traded in active markets.
	Level 2	valuation is based upon quoted market prices for similar instruments traded in active markets, quoted market prices for identical or similar instruments traded in markets that are not active and model-based valuation techniques for which all significant assumptions are observable in the market or can be corroborated by market data.
	Level 3	valuation is derived from other valuation methodologies including discounted cash flow models and similar techniques that use significant assumptions not observable in the market. These unobservable assumptions reflect estimates of assumptions that market participants would use in determining fair value.
	A financial instrument’s level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement.
	Following is a description of the valuation methodologies the Corporation uses for financial instruments recorded at fair value on either a recurring or non-recurring basis:
	Securities Available For Sale
	Securities available for sale consists of both debt and equity securities. These securities are recorded at fair value on a recurring basis. At September 30, 2014, 99.9% of these securities used valuation methodologies involving market-based or market-derived information, collectively Level 1 and Level 2 measurements, to measure fair value. The remaining 0.1% of these securities used model-based valuation techniques, with primarily unobservable (Level 3) inputs.
	The Corporation closely monitors market conditions involving assets that have become less actively traded. If the fair value measurement is based upon recent observable market activity of such assets or comparable assets (other than forced or distressed transactions) that occur in sufficient volume, and do not require significant adjustment using unobservable inputs, those assets are classified as Level 1 or Level 2; if not, they are classified as Level 3. Making this assessment requires significant judgment.
	The Corporation uses prices from independent pricing services and, to a lesser extent, indicative (non-binding) quotes from independent brokers, to measure the fair value of investment securities. The Corporation validates prices received from pricing services or brokers using a variety of methods, including, but not limited to, comparison to secondary pricing services, corroboration of pricing by reference to other independent market data such as secondary broker quotes and relevant benchmark indices, and review of pricing by Corporate personnel familiar with market liquidity and other market-related conditions.
	Derivative Financial Instruments
	The Corporation determines its fair value for derivatives using widely accepted valuation techniques including discounted cash flow analysis on the expected cash flows of each derivative. This analysis reflects contractual terms of the derivative, including the period to maturity and uses observable market based inputs, including interest rate curves and implied volatilities.
	The Corporation incorporates credit valuation adjustments to appropriately reflect both its own non-performance risk and the respective counterparty’s non-performance risk in the fair value measurements. In adjusting the fair value of its derivative contracts for the effect of non-performance risk, the Corporation considers the impact of netting and any applicable credit enhancements, such as collateral postings, thresholds, mutual puts and guarantees.
	Although the Corporation has determined that the majority of the inputs used to value its derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with its derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by itself and its counterparties. However, as of September 30, 2014, the Corporation has assessed the significance of the impact of the credit valuation adjustments on the overall valuation of its derivative positions and has determined that the credit valuation adjustments are not significant to the overall valuation of its derivatives. As a result, the Corporation has determined that its derivative valuations in their entirety are classified in Level 2 of the fair value hierarchy.
	Residential Mortgage Loans Held For Sale
	These loans are carried at the lower of cost or fair value. Under lower of cost or fair value accounting, periodically, it may be necessary to record non-recurring fair value adjustments. Fair value, when recorded, is based on independent quoted market prices and is classified as Level 2.
	Impaired Loans
	The Corporation reserves for commercial loan relationships greater than or equal to $500 that the Corporation considers impaired as defined in ASC 310 at the time the Corporation identifies the loan as impaired based upon the present value of expected future cash flows available to pay the loan, or based upon the fair value of the collateral less estimated selling costs where a loan is collateral dependent. Collateral may be real estate and/or business assets including equipment, inventory and accounts receivable.
	The Corporation determines the value of real estate based on appraisals by licensed or certified appraisers. The value of business assets is generally based on amounts reported on the business’ financial statements. Management must rely on the financial statements prepared and certified by the borrower or its accountants in determining the value of these business assets on an ongoing basis which may be subject to significant change over time. Based on the quality of information or statements provided, management may require the use of business asset appraisals and site-inspections to better value these assets. The Corporation may discount appraised and reported values based on management’s historical knowledge, changes in market conditions from the time of valuation or management’s knowledge of the borrower and the borrower’s business. Since not all valuation inputs are observable, the Corporation classifies these non-recurring fair value determinations as Level 2 or Level 3 based on the lowest level of input that is significant to the fair value measurement.
	The Corporation reviews and evaluates impaired loans no less frequently than quarterly for additional impairment based on the same factors identified above.
	Other Real Estate Owned
	OREO is comprised of commercial and residential real estate properties obtained in partial or total satisfaction of loan obligations plus some bank owned real estate. OREO acquired in settlement of indebtedness is recorded at the lower of carrying amount of the loan or fair value less costs to sell. Subsequently, these assets are carried at the lower of carrying value or fair value less costs to sell. Accordingly, it may be necessary to record non-recurring fair value adjustments. Fair value is generally based upon appraisals by licensed or certified appraisers and other market information and is classified as Level 2 or Level 3.
	The following table presents the balances of assets and liabilities measured at fair value on a recurring basis:
		Level 1			Level 2			Level 3			Total
	September 30, 2014
	Assets measured at fair value
	Available for sale debt securities:
	U.S. Treasury	$	—		$	29,534		$	—		$	29,534
	U.S. government-sponsored entities		—			275,508			—			275,508
	Residential mortgage-backed securities
	Agency mortgage-backed securities		—			496,483			—			496,483
	Agency collateralized mortgage obligations		—			596,935			—			596,935
	Non-agency collateralized mortgage obligations		—			13			1,534			1,547
	Commercial mortgage-backed securities		—			8,036			—			8,036
	States of the U.S. and political subdivisions		—			13,894			—			13,894
	Other debt securities		—			16,478			—			16,478
			—			1,436,881			1,534			1,438,415
	Available for sale equity securities:
	Financial services industry		87			677			440			1,204
	Insurance services industry		116			—			—			116
			203			677			440			1,320
			203			1,437,558			1,974			1,439,735
	Derivative financial instruments:
	Trading		—			34,086			—			34,086
	Not for trading		—			542			—			542
			—			34,628			—			34,628
		$	203		$	1,472,186		$	1,974		$	1,474,363
	Liabilities measured at fair value
	Derivative financial instruments:
	Trading		—		$	34,013			—		$	34,013
	Not for trading		—			4,642			—			4,642
			—		$	38,655			—		$	38,655
		Level 1			Level 2			Level 3			Total
	December 31, 2013
	Assets measured at fair value
	Available for sale debt securities:
	U.S. government-sponsored entities	$	—		$	330,985		$	—		$	330,985
Residential mortgage-backed securities
Agency mortgage-backed securities		—			250,881			—			250,881
Agency collateralized mortgage obligations		—			491,199			—			491,199
Non-agency collateralized mortgage obligations		—			18			1,744			1,762
States of the U.S. and political subdivisions		—			17,002			—			17,002
Collateralized debt obligations		—			—			31,595			31,595
Other debt securities		—			16,100			—			16,100
		—			1,106,185			33,339			1,139,524
Available for sale equity securities:
Financial services industry		584			1,067			410			2,061
Insurance services industry		65			—			—			65
		649			1,067			410			2,126
		649			1,107,252			33,749			1,141,650
Derivative financial instruments:
Trading		—			33,317			—			33,317
Not for trading		—			—			—			—
		—			33,317			—			33,317
	$	649		$	1,140,569		$	33,749		$	1,174,967
Liabilities measured at fair value
Derivative financial instruments:
Trading		—		$	33,236			—		$	33,236
Not for trading		—			10,133			—			10,133
		—		$	43,369			—		$	43,369
There were no transfers of assets or liabilities between the hierarchy levels for 2014. During 2013, the Corporation transferred out of Level 2 and Level 3 equity securities that now trade on NASDAQ. At December 31, 2013, the securities are classified as Level 1. Additionally during 2013, the Corporation transferred out of Level 3 and into Level 2 four single name TPS.
The following table presents additional information about assets measured at fair value on a recurring basis and for which the Corporation has utilized Level 3 inputs to determine fair value:
	Pooled Trust			Other			Equity			Residential			Total
	Preferred			Debt			Securities			Non-Agency
	Collateralized			Securities						Collateralized
	Debt									Mortgage
	Obligations									Obligations
Nine Months Ended September 30, 2014
Balance at beginning of period	$	31,595			—		$	410		$	1,744		$	33,749
Total gains (losses) – realized/unrealized:
Included in earnings		13,766			—			—			—			13,766
Included in other comprehensive income		5,608			—			30			4			5,642
Accretion included in earnings		657			—			—			3			660
Purchases, issuances, sales and settlements:
Purchases		—			—			—			—			—
Issuances		—			—			—			—			—
Sales/redemptions		(51,527	)		—			—			—			(51,527	)
Settlements		(99	)		—			—			(217	)		(316	)
Transfers from Level 3		—			—			—			—			—
Transfers into Level 3		—			—			—			—			—
Balance at end of period	$	—			—		$	440		$	1,534		$	1,974
Year Ended December 31, 2013
Balance at beginning of period	$	22,456		$	6,892		$	512		$	2,705		$	32,565
Total gains (losses) – realized/unrealized:
Included in earnings		—			78			—			—			78
Included in other comprehensive income		6,701			21			18			(35	)		6,705
Accretion included in earnings		3,160			4			—			12			3,176
Purchases, issuances, sales and settlements:
Purchases		—			—			—			—			—
Issuances		38			—			—			—			38
Sales/redemptions		—			(1,033	)		—			—			(1,033	)
Settlements		(760	)		—			—			(938	)		(1,698	)
Transfers from Level 3		—			(5,962	)		(120	)		—			(6,082	)
Transfers into Level 3		—			—			—			—			—
Balance at end of period	$	31,595		$	—		$	410		$	1,744		$	33,749
The Corporation reviews fair value hierarchy classifications on a quarterly basis. Changes in the observability of the valuation attributes may result in reclassification of certain financial assets or liabilities. Such reclassifications are reported as transfers in/out of Level 3 at fair value at the beginning of the period in which the changes occur. See the Securities footnote in the Notes to Consolidated Financial Statements section of this Report for information relating to significant unobservable inputs used in determining Level 3 fair values.
For the nine months ended September 30, 2014 and 2013, there were no gains or losses included in earnings attributable to the change in unrealized gains or losses relating to assets still held as of those dates. The total gains included in earnings are in the net securities gains line item in the Consolidated Statements of Comprehensive Income.
In accordance with GAAP, from time to time, the Corporation measures certain assets at fair value on a non-recurring basis. These adjustments to fair value usually result from the application of the lower of cost or fair value accounting or write-downs of individual assets. Valuation methodologies used to measure these fair value adjustments were previously described. For assets measured at fair value on a non-recurring basis still held at the balance sheet date, the following table provides the hierarchy level and the fair value of the related assets or portfolios:
	Level 1			Level 2			Level 3			Total
September 30, 2014
Impaired loans		—		$	10,724		$	1,393		$	12,117
Other real estate owned		—			3,801			2,405			6,206
December 31, 2013
Impaired loans		—			3,235			59			3,294
Other real estate owned		—			4,485			14,957			19,442
Impaired loans measured or re-measured at fair value on a non-recurring basis during the nine months ended September 30, 2014 had a carrying amount of $12,538 and an allocated allowance for loan losses of $1,771 at September 30, 2014. The allocated allowance is based on fair value of $12,117 less estimated costs to sell of $1,350. The allowance for loan losses includes a provision applicable to the current period fair value measurements of $1,374, which was included in the provision for loan losses for the nine months ended September 30, 2014.
OREO with a carrying amount of $7,164 was written down to $5,476 (fair value of $6,206 less estimated costs to sell of $730), resulting in a loss of $1,688, which was included in earnings for the nine months ended September 30, 2014.
Fair Value of Financial Instruments
The following methods and assumptions were used to estimate the fair value of each financial instrument:
Cash and Cash Equivalents, Accrued Interest Receivable and Accrued Interest Payable. For these short-term instruments, the carrying amount is a reasonable estimate of fair value.
Securities. For both securities available for sale and securities held to maturity, fair value equals the quoted market price from an active market, if available, and is classified within Level 1. If a quoted market price is not available, fair value is estimated using quoted market prices for similar securities or pricing models, and is classified as Level 2. Where there is limited market activity or significant valuation inputs are unobservable, securities are classified within Level 3. Under current market conditions, assumptions used to determine the fair value of Level 3 securities have greater subjectivity due to the lack of observable market transactions.
Loans. The fair value of fixed rate loans is estimated by discounting the future cash flows using the current rates at which similar loans would be made to borrowers with similar credit ratings and for the same remaining maturities less an illiquidity discount. The fair value of variable and adjustable rate loans approximates the carrying amount. Due to the significant judgment involved in evaluating credit quality, loans are classified within Level 3 of the fair value hierarchy.
Bank Owned Life Insurance. The Corporation owns general account, separate account and hybrid account bank owned life insurance (BOLI). The fair value of the general account BOLI is based on the insurance contract cash surrender value. The separate account BOLI has a stable value protection (SVP) component that mitigates the impact of market value fluctuations of the underlying account assets. The SVP component guarantees the book value, which is the insurance contract cash surrender value. The hybrid account BOLI also has a guaranteed book value, except it does not require a stable value protection component. Instead, the insurance carrier incurs the investment return risk, which is imbedded in their fee structure.
If the Corporation’s separate account and hybrid account BOLI book value exceeds the market value of the underlying securities, then the fair value of the separate account and hybrid account BOLI is the cash surrender value. If the Corporation’s separate account and hybrid account BOLI book value is less than the market value of the underlying securities, then the fair value of the separate account and hybrid account BOLI is the quoted market price of the underlying securities.
Derivative Assets and Liabilities. The Corporation determines its fair value for derivatives using widely accepted valuation techniques including discounted cash flow analysis on the expected cash flows of each derivative. This analysis reflects contractual terms of the derivative, including the period to maturity and uses observable market based inputs, including interest rate curves and implied volatilities.
The Corporation incorporates credit valuation adjustments to appropriately reflect both its own non-performance risk and the respective counterparty’s non-performance risk in the fair value measurements. In adjusting the fair value of its derivative contracts for the effect of non-performance risk, the Corporation considers the impact of netting and any applicable credit enhancements, such as collateral postings, thresholds, mutual puts and guarantees.
Although the Corporation has determined that the majority of the inputs used to value its derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with its derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by itself and its counterparties. However, as of September 30, 2014, the Corporation has assessed the significance of the impact of the credit valuation adjustments on the overall valuation of its derivative positions and has determined that the credit valuation adjustments are not significant to the overall valuation of its derivatives. As a result, the Corporation has determined that its derivative valuations in their entirety are classified in Level 2 of the fair value hierarchy.
Deposits. The estimated fair value of demand deposits, savings accounts and certain money market deposits is the amount payable on demand at the reporting date because of the customers’ ability to withdraw funds immediately. The fair value of fixed-maturity deposits is estimated by discounting future cash flows using rates currently offered for deposits of similar remaining maturities.
Short-Term Borrowings. The carrying amounts for short-term borrowings approximate fair value for amounts that mature in 90 days or less. The fair value of subordinated notes is estimated by discounting future cash flows using rates currently offered.
Long-Term and Junior Subordinated Debt. The fair value of long-term and junior subordinated debt is estimated by discounting future cash flows based on the market prices for the same or similar issues or on the current rates offered to the Corporation for debt of the same remaining maturities.
Loan Commitments and Standby Letters of Credit. Estimates of the fair value of these off-balance sheet items were not made because of the short-term nature of these arrangements and the credit standing of the counterparties. Also, unfunded loan commitments relate principally to variable rate commercial loans, typically are non-binding, and fees are not normally assessed on these balances.
Nature of Estimates. Many of the estimates presented herein are based upon the use of highly subjective information and assumptions and, accordingly, the results may not be precise. Management believes that fair value estimates may not be comparable to other financial institutions due to the wide range of permitted valuation techniques and numerous estimates which must be made. Further, because the disclosed fair value amounts were estimated as of the balance sheet date, the amounts actually realized or paid upon maturity or settlement of the various financial instruments could be significantly different.
The fair values of the Corporation’s financial instruments are as follows:
							Fair Value Measurements
	Carrying			Fair			Level 1			Level 2			Level 3
	Amount			Value
September 30, 2014
Financial Assets
Cash and cash equivalents	$	237,968		$	237,968		$	237,968		$	—		$	—
Securities available for sale		1,439,735			1,439,735			203			1,437,558			1,974
Securities held to maturity		1,475,552			1,480,229			—			1,475,584			4,645
Net loans, including loans held for sale		10,851,690			10,709,224			—			—			10,709,224
Bank owned life insurance		299,828			305,149			305,149			—			—
Derivative assets		34,628			34,628			—			34,628			—
Accrued interest receivable		39,609			39,609			39,609			—			—
Financial Liabilities
Deposits		11,452,093			11,455,085			8,772,509			2,682,576			—
Short-term borrowings		1,601,167			1,601,167			1,601,167			—			—
Long-term debt		483,189			484,900			—			—			484,900
Junior subordinated debt		58,233			58,225			—			—			58,225
Derivative liabilities		38,655			38,655			—			38,655			—
Accrued interest payable		6,507			6,507			6,507			—			—
December 31, 2013
Financial Assets
Cash and cash equivalents	$	213,981		$	213,981		$	213,981		$	—		$	—
Securities available for sale		1,141,650			1,141,650			649			1,107,252			33,749
Securities held to maturity		1,199,169			1,189,563			—			1,182,671			6,892
Net loans, including loans held for sale		9,402,448			9,243,780			—			—			9,243,780
Bank owned life insurance		289,402			292,694			292,694			—			—
Derivative assets		33,317			33,317			—			33,317			—
Accrued interest receivable		35,520			35,520			35,520			—			—
Financial Liabilities
Deposits		10,198,232			10,208,268			7,592,159			2,616,109			—
Short-term borrowings		1,241,239			1,241,239			1,241,239			—			—
Long-term debt		143,928			145,995			—			—			145,995
Junior subordinated debt		75,205			70,442			—			—			70,442
Derivative liabilities		43,369			43,369			—			43,369			—
Accrued interest payable		7,061			7,061			7,061			—			—

New_Accounting_Standards_Polic

New Accounting Standards (Policies)	9 Months Ended
	Sep. 30, 2014
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]	'
Presentation of Financial Statements	'
	Presentation of Financial Statements
	In August 2014, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2014-15, Presentation of Financial Statements – Going Concern. ASU 2014-15 requires management to evaluate whether there is substantial doubt about the entity’s ability to continue as a going concern, and if so, disclose that fact. ASU 2014-15 defines substantial doubt as when it is probable that the entity will be unable to meet its obligations as they become due within one year of the date the financial statements are issued. The guidance states that when making this assessment, management should consider relevant conditions or events that are known or reasonably knowable on the date the financial statements are issued. The requirements of ASU 2014-15 are effective for reporting periods beginning after December 15, 2016, with early adoption permitted. The adoption of this update is not expected to have an effect on the financial statements, results of operations or liquidity of the Corporation.
Troubled Debt Restructurings	'
	Troubled Debt Restructurings
	In August 2014, the FASB issued ASU No. 2014-14, Receivables – Troubled Debt Restructurings by Creditors. ASU 2014-14 requires that a mortgage loan be derecognized and that a separate other receivable be recognized upon foreclosure if the following conditions are met: (1) the loan has a government guarantee that is not separable from the loan before foreclosure; (2) at the time of foreclosure, the creditor has the intent to convey the real estate property to the guarantor and make a claim on the guarantee, and the creditor has the ability to recover under that claim; and (3) at the time of foreclosure, any amount of the claim that is determined on the basis of the fair value of the real estate is fixed. Upon foreclosure, the separate other receivable should be measured based on the amount of the loan balance (principal and interest) expected to be recovered from the guarantor. An entity can adopt the amendments in this guidance using either a prospective transition method or a modified retrospective method. For prospective transition, an entity should apply the amendments in this update to foreclosures that occur after the date of adoption. For modified retrospective transition, an entity should apply the amendments in this update by means of a cumulative-effect adjustment as of the beginning of the annual period of adoption. Prior periods should not be adjusted. The requirements of ASU 2014-14 are effective for reporting periods beginning after December 15, 2014, with early adoption permitted. The adoption of this update is not expected to have a material effect on the financial statements, results of operations or liquidity of the Corporation.
	In January 2014, the FASB issued ASU No. 2014-04, Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure, to clarify when an in-substance repossession or foreclosure occurs; that is, when a creditor should be considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan such that the loan should be derecognized and other real estate owned (OREO) recognized. ASU 2014-04 requires a creditor to reclassify a collateralized consumer mortgage loan to OREO upon obtaining legal title to the real estate collateral, or the borrower voluntarily conveying all interest in the real estate property to the lender to satisfy the loan through a deed in lieu of foreclosure or similar legal agreement. The requirements of ASU 2014-04 are effective for reporting periods beginning after December 15, 2014. The adoption of this update will not have an impact on the financial statements, results of operations or liquidity of the Corporation since the Corporation already accounts for foreclosures according to the requirements of this update.
Stock Compensation	'
	Stock Compensation
	In June 2014, the FASB issued ASU No. 2014-12, Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period. ASU 2014-12 provides guidance relating to the accounting for a performance target that could be achieved after the requisite service period. ASU 2014-12 requires that such performance targets be treated as a performance condition. As such, the performance target should not be reflected in estimating the grant-date fair value of the award. Compensation cost should be recognized in the period in which it becomes probable that the performance target will be achieved and should represent the compensation cost attributable to the periods for which the requisite service has already been rendered. The requirements of ASU 2014-12 are effective for reporting periods beginning after December 15, 2015, with early adoption permitted. Companies may apply the amendments in this standard either prospectively to all awards granted or modified after the effective date or retrospectively to all awards with performance targets that are outstanding as of the beginning of the earliest annual period presented in the financial statements and to all new or modified awards thereafter. If retrospective transition is adopted, the cumulative effect of applying ASU 2014-12 should be recognized as an adjustment to the beginning balance of retained earnings. The adoption of this update is not expected to have a material effect on the financial statements, results of operations or liquidity of the Corporation.
Repurchase Agreements	'
	Repurchase Agreements
	In June 2014, the FASB issued ASU No. 2014-11, Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures, that requires repurchase-to-maturity transactions to be accounted for as secured borrowings, eliminates current guidance on repurchase financings and requires separate accounting for a transfer of a financial asset executed contemporaneously with a repurchase agreement with the same counterparty. ASU 2014-11 also requires an entity to disclose information on transfers accounted for as sales in transactions that are economically similar to repurchase agreements and to disclose information about the types of collateral pledged in repurchase agreements and similar transactions accounted for as secured borrowings. The accounting changes in ASU 2014-11 are effective for the first interim or annual reporting period beginning after December 15, 2014. Changes in accounting for transactions outstanding on the effective date must be presented as a cumulative-effect adjustment to retained earnings as of the beginning of the period of adoption. Early adoption is prohibited. The disclosure for certain transactions accounted for as a sale is required to be presented for interim and annual reporting periods beginning after December 15, 2014. The disclosure for repurchase agreements and repurchase-to-maturity transactions accounted for as secured borrowings is required to be presented for annual periods beginning after December 15, 2014, and for interim periods beginning after March 15, 2015. The Corporation is evaluating this new guidance and has not yet determined the impact that the adoption of this update will have on its financial statements.
Revenue Recognition	'
	Revenue Recognition
	In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers, to clarify the principles for recognizing revenue and to improve financial reporting by creating common revenue recognition guidance for GAAP and International Financial Reporting Standards. The core principle of the new guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. ASU 2014-09 is effective for annual reporting periods beginning after December 15, 2016, including interim periods within that reporting period. Early application is not permitted. An entity should apply the amendments in this update using either a full retrospective application or a modified retrospective application. Under the full retrospective application, an entity will apply the standard to each prior reporting period presented. Under the modified retrospective application, an entity recognizes the cumulative effect of initially applying the new standard as an adjustment to the opening balance of retained earnings at the date of initial application. Revenue in periods presented before that date will continue to be reported under guidance in effect before the change. The Corporation is evaluating this new guidance and has not yet determined which approach it will adopt to apply the amendments in ASU 2014-09 or the impact that the adoption of this update will have on its financial statements.
Investments in Qualified Affordable Housing Projects	'
	Investments in Qualified Affordable Housing Projects
	In January 2014, the FASB issued ASU No. 2014-01, Accounting for Investments in Qualified Affordable Housing Projects, to revise the accounting for investments in qualified affordable housing projects. ASU 2014-01 modifies the conditions that must be met to present the pretax effects and related tax benefits of such investments as a component of income taxes (“net” within income tax expense). It is expected that the new guidance will enable more investors to use a “net” presentation for investments in qualified affordable housing projects. Investors that do not qualify for “net” presentation under the new guidance will continue to account for such investments under the equity method or cost method, which results in losses recognized in pretax income and tax benefits recognized in income taxes (“gross” presentation of investment results). For investments that qualify for the “net” presentation of investment performance, the guidance introduces a “proportional amortization method” that can be elected to amortize the investment basis. If elected, the method is required for all eligible investments in qualified affordable housing projects. The requirements of ASU 2014-01 are effective for reporting periods beginning after December 15, 2014, with early adoption permitted. The adoption of this update is not expected to have a material effect on the financial statements, results of operations or liquidity of the Corporation.
Income Taxes	'
	Income Taxes
	In July 2013, the FASB issued ASU No. 2013-11, Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists, to provide guidance on the financial statement presentation of certain unrecognized tax benefits. An unrecognized tax benefit or a portion of an unrecognized tax benefit should be presented in the financial statements as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss or a tax credit carryforward with certain exceptions related to availability. The requirements of ASU 2013-11 are effective prospectively for reporting periods beginning after December 15, 2013, with early adoption permitted. The adoption of this update did not have a material effect on the financial statements, results of operations or liquidity of the Corporation.

Securities_Tables

Securities (Tables)	9 Months Ended
	Sep. 30, 2014
Investments, Debt and Equity Securities [Abstract]	'
Schedule of Amortized Cost and Fair Value of Securities Available for Sale	'
	The amortized cost and fair value of securities are as follows:
		Amortized			Gross			Gross			Fair Value
		Cost			Unrealized			Unrealized
					Gains			Losses
	Securities Available for Sale:
	September 30, 2014
	U.S. Treasury	$	29,570		$	—		$	(36	)	$	29,534
	U.S. government-sponsored entities		278,330			162			(2,984	)		275,508
	Residential mortgage-backed securities:
	Agency mortgage-backed securities		492,456			4,798			(771	)		496,483
	Agency collateralized mortgage obligations		608,284			645			(11,995	)		596,934
	Non-agency collateralized mortgage obligations		1,530			17			—			1,547
	Commercial mortgage-backed securities		8,062			—			(25	)		8,037
	States of the U.S. and political subdivisions		13,413			523			(42	)		13,894
	Other debt securities		16,587			473			(582	)		16,478
	Total debt securities		1,448,232			6,618			(16,435	)		1,438,415
	Equity securities		1,031			289			—			1,320
		$	1,449,263		$	6,907		$	(16,435	)	$	1,439,735
	December 31, 2013
	U.S. government-sponsored entities	$	336,763		$	126		$	(5,904	)	$	330,985
	Residential mortgage-backed securities:
	Agency mortgage-backed securities		247,880			4,304			(1,303	)		250,881
	Agency collateralized mortgage obligations		511,098			895			(20,794	)		491,199
	Non-agency collateralized mortgage obligations		1,747			15			—			1,762
	States of the U.S. and political subdivisions		16,842			410			(250	)		17,002
	Collateralized debt obligations		37,203			4,507			(10,115	)		31,595
	Other debt securities		16,505			524			(929	)		16,100
	Total debt securities		1,168,038			10,781			(39,295	)		1,139,524
	Equity securities		1,444			682			—			2,126
		$	1,169,482		$	11,463		$	(39,295	)	$	1,141,650
Schedule of Amortized Cost and Fair Value of Securities Held to Maturity	'
		Amortized			Gross			Gross			Fair Value
		Cost			Unrealized			Unrealized
					Gains			Losses
	Securities Held to Maturity:
	September 30, 2014
	U.S. Treasury	$	502		$	141		$	—		$	643
	U.S. government-sponsored entities		101,652			496			(937	)		101,211
	Residential mortgage-backed securities:
	Agency mortgage-backed securities		709,123			13,428			(1,792	)		720,759
	Agency collateralized mortgage obligations		494,791			1,061			(10,784	)		485,068
	Non-agency collateralized mortgage obligations		4,630			17			(2	)		4,645
	Commercial mortgage-backed securities		14,959			122			(99	)		14,982
	States of the U.S. and political subdivisions		149,895			3,119			(93	)		152,921
		$	1,475,552		$	18,384		$	(13,707	)	$	1,480,229
	December 31, 2013
	U.S. Treasury	$	503		$	99		$	—		$	602
	U.S. government-sponsored entities		43,322			180			(1,151	)		42,351
	Residential mortgage-backed securities:
	Agency mortgage-backed securities		628,681			12,281			(6,032	)		634,930
	Agency collateralized mortgage obligations		385,408			764			(15,844	)		370,328
	Non-agency collateralized mortgage obligations		6,852			44			(4	)		6,892
	Commercial mortgage-backed securities		2,241			124			(37	)		2,328
	States of the U.S. and political subdivisions		132,162			1,992			(2,022	)		132,132
		$	1,199,169		$	15,484		$	(25,090	)	$	1,189,563
Gross Gains and Gross Losses Realized on Sales of Securities	'
	Gross gains and gross losses were realized on securities as follows:
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2014			2013			2014			2013
	Gross gains	$	1,191		$	5		$	19,939		$	1,120
	Gross losses		(13	)		—			(8,524	)		(363	)
		$	1,178		$	5		$	11,415		$	757
Amortized Cost and Fair Value of Securities, by Contractual Maturities	'
	As of September 30, 2014, the amortized cost and fair value of securities, by contractual maturities, were as follows:
		Available for Sale						Held to Maturity
		Amortized			Fair			Amortized			Fair
		Cost			Value			Cost			Value
	Due in one year or less	$	—		$	—		$	3,711		$	3,741
	Due from one to five years		283,913			282,767			90,393			89,667
	Due from five to ten years		47,102			46,344			79,109			80,905
	Due after ten years		6,885			6,303			78,836			80,462
			337,900			335,414			252,049			254,775
	Residential mortgage-backed securities:
	Agency mortgage-backed securities		492,456			496,483			709,123			720,759
	Agency collateralized mortgage obligations		608,284			596,934			494,791			485,068
	Non-agency collateralized mortgage obligations		1,530			1,547			4,630			4,645
	Commercial mortgage-backed securities		8,062			8,037			14,959			14,982
	Equity securities		1,031			1,320			—			—
		$	1,449,263		$	1,439,735		$	1,475,552		$	1,480,229
Summaries of Fair Values and Unrealized Losses of Securities, Segregated by Length of Impairment	'
	Following are summaries of the fair values and unrealized losses of securities, segregated by length of impairment:
		Less than 12 Months									12 Months or More								Total
		#			Fair Value			Unrealized			#			Fair Value		Unrealized			#		Fair Value		Unrealized
								Losses								Losses							Losses
	Securities Available for Sale:
	September 30, 2014
	U.S. Treasury		3		$	29,534		$	(36	)		—		$	—	$	—			3	$	29,534	$	(36	)
	U.S. government-sponsored entities		9			102,319			(259	)		8			113,264		(2,725	)		17		215,583		(2,984	)
	Residential mortgage-backed securities:
	Agency mortgage-backed securities		10			196,423			(771	)		—			—		—			10		196,423		(771	)
	Agency collateralized mortgage obligations		14			292,696			(2,225	)		16			232,824		(9,770	)		30		525,520		(11,995	)
	Commercial mortgage-backed securities		1			8,036			(25	)		—			—		—			1		8,036		(25	)
	States of the U.S. and political subdivisions		—			—			—			1			1,149		(42	)		1		1,149		(42	)
	Other debt securities		—			—			—			4			6,304		(582	)		4		6,304		(582	)
			37		$	629,008		$	(3,316	)		29		$	353,541	$	(13,119	)		66	$	982,549	$	(16,435	)
	December 31, 2013
	U.S. government-sponsored entities		17		$	232,962		$	(5,904	)		—		$	—	$	—			17	$	232,962	$	(5,904	)
	Residential mortgage-backed securities:
	Agency mortgage-backed securities		9			108,284			(1,303	)		—			—		—			9		108,284		(1,303	)
	Agency collateralized mortgage obligations		26			389,989			(18,644	)		2			34,229		(2,150	)		28		424,218		(20,794	)
	States of the U.S. and political subdivisions		2			3,022			(250	)		—			—		—			2		3,022		(250	)
	Collateralized debt obligations		—			—			—			8			7,965		(10,115	)		8		7,965		(10,115	)
	Other debt securities		—			—			—			4			5,950		(929	)		4		5,950		(929	)
			54		$	734,257		$	(26,101	)		14		$	48,144	$	(13,194	)		68	$	782,401	$	(39,295	)
	Securities Held to Maturity:
	September 30, 2014
	U.S. government-sponsored entities		3		$	39,956		$	(151	)		3		$	39,247	$	(786	)		6	$	79,203	$	(937	)
	Residential mortgage-backed securities:
	Agency mortgage-backed securities		12			149,058			(631	)		8			83,697		(1,161	)		20		232,755		(1,792	)
	Agency collateralized mortgage obligations		8			125,974			(1,036	)		16			216,359		(9,748	)		24		342,333		(10,784	)
	Non-agency collateralized mortgage obligations		1			761			(2	)		—			—		—			1		761		(2	)
	Commercial mortgage-backed securities		2			13,655			(99	)		—			—		—			2		13,655		(99	)
	States of the U.S. and political subdivisions		1			1,726			(13	)		5			6,606		(80	)		6		8,332		(93	)
			27		$	331,130		$	(1,932	)		32		$	345,909	$	(11,775	)		59	$	677,039	$	(13,707	)
	December 31, 2013
	U.S. government-sponsored entities		2		$	24,513		$	(530	)		1		$	14,378	$	(621	)		3	$	38,891	$	(1,151	)
	Residential mortgage-backed securities:
	Agency mortgage-backed securities		24			308,864			(5,942	)		1			1,296		(90	)		25		310,160		(6,032	)
	Agency collateralized mortgage obligations		21			301,312			(15,844	)		—			—		—			21		301,312		(15,844	)
	Non-agency collateralized mortgage obligations		3			2,010			(4	)		—			—		—			3		2,010		(4	)
	Commercial mortgage-backed securities		1			984			(37	)		—			—		—			1		984		(37	)
	States of the U.S. and political subdivisions		27			31,537			(2,022	)		—			—		—			27		31,537		(2,022	)
			78		$	669,220		$	(24,379	)		2		$	15,674	$	(711	)		80	$	684,894	$	(25,090	)
Summary of Cumulative Credit-Related OTTI Charges	'
	The following table presents a summary of the cumulative credit-related OTTI charges recognized as components of earnings for securities for which a portion of an OTTI is recognized in other comprehensive income:
		Collateralized			Residential			Equities			Total
		Debt			Non-Agency
		Obligations			CMOs
	For the Nine Months Ended September 30, 2014
	Beginning balance	$	17,155		$	—		$	27		$	17,182
	Loss where impairment was not previously recognized		—			—			—			—
	Additional loss where impairment was previously recognized		—			—			—			—
	Reduction due to credit impaired securities sold		(17,155	)		—			—			(17,155	)
	Ending balance	$	—		$	—		$	27		$	27
	For the Nine Months Ended September 30, 2013
	Beginning balance	$	17,155		$	212			—		$	17,367
	Loss where impairment was not previously recognized		—			—			—			—
	Additional loss where impairment was previously recognized		—			—			—			—
	Reduction due to credit impaired securities sold		—			(212	)		—			(212	)
	Ending balance	$	17,155		$	—			—		$	17,155

Loans_and_Allowance_for_Loan_L1

Loans and Allowance for Loan Losses (Tables)	9 Months Ended
	Sep. 30, 2014
Receivables [Abstract]	'
Summary of Loans, Net of Unearned Income	'
	Following is a summary of loans, net of unearned income:
			Originated			Acquired			Total
			Loans			Loans			Loans
	September 30, 2014
	Commercial real estate		$	2,930,146		$	860,018		$	3,790,164
	Commercial and industrial			2,104,559			143,046			2,247,605
	Commercial leases			171,615			—			171,615
	Total commercial loans and leases			5,206,320			1,003,064			6,209,384
	Direct installment			1,509,096			70,216			1,579,312
	Residential mortgages			762,743			469,053			1,231,796
	Indirect installment			803,201			2,635			805,836
	Consumer lines of credit			915,007			172,264			1,087,271
	Other			54,261			—			54,261
			$	9,250,628		$	1,717,232		$	10,967,860
	December 31, 2013
	Commercial real estate		$	2,640,428		$	604,781		$	3,245,209
	Commercial and industrial			1,761,668			119,806			1,881,474
	Commercial leases			158,895			—			158,895
	Total commercial loans and leases			4,560,991			724,587			5,285,578
	Direct installment			1,387,995			79,241			1,467,236
	Residential mortgages			678,227			408,512			1,086,739
	Indirect installment			649,701			5,886			655,587
	Consumer lines of credit			832,668			133,103			965,771
	Other			45,183			—			45,183
			$	8,154,765		$	1,351,329		$	9,506,094
Carrying Amounts at Acquisition of All Purchased Loans (Impaired and Non-Impaired) Acquired	'
	The following table reflects amounts at acquisition for all purchased loans subject to ASC 310-30 (impaired and non-impaired) acquired from BCSB in 2014 and PVF and ANNB in 2013. ASC 310-30 (impaired and non-impaired) loans acquired from OBA in 2014 are not presented because their values are expected to be immaterial, are preliminary in nature and are subject to refinement as additional information becomes available.
			Acquired			Acquired			Total
			Impaired			Performing
			Loans			Loans
	Acquired from BCSB in 2014
	Contractually required cash flows at acquisition		$	10,470		$	350,243		$	360,713
	Non-accretable difference (expected losses and foregone interest)			(5,426	)		(17,720	)		(23,146	)
	Cash flows expected to be collected at acquisition			5,044			332,523			337,567
	Accretable yield			(704	)		(70,407	)		(71,111	)
	Basis in acquired loans at acquisition		$	4,340		$	262,116		$	266,456
	Acquired from PVF and ANNB in 2013
	Contractually required cash flows at acquisition		$	40,972		$	796,114		$	837,086
	Non-accretable difference (expected losses and foregone interest)			(23,207	)		(52,992	)		(76,199	)
	Cash flows expected to be collected at acquisition			17,765			743,122			760,887
	Accretable yield			(2,505	)		(112,847	)		(115,352	)
	Basis in acquired loans at acquisition		$	15,260		$	630,275		$	645,535
Summary of Change in Accretable Yield of Acquired Loans	'
	The following table provides a summary of change in accretable yield for all acquired loans:
			Acquired			Acquired			Total
			Impaired			Performing
			Loans			Loans
	Nine Months Ended September 30, 2014
	Balance at beginning of period		$	7,456		$	298,190		$	305,646
	Acquisitions			704			70,407			71,111
	Reduction due to unexpected early payoffs			—			(34,747	)		(34,747	)
	Reclass from non-accretable difference			2,612			7,313			9,925
	Disposals/transfers			(2,938	)		(2,452	)		(5,390	)
	Accretion			(4,530	)		(50,134	)		(54,664	)
	Balance at end of period		$	3,304		$	288,577		$	291,881
	Year Ended December 31, 2013
	Balance at beginning of period		$	778		$	253,375		$	254,153
	Acquisitions			2,505			112,847			115,352
	Reduction due to unexpected early payoffs			—			(42,582	)		(42,582	)
	Reclass from non-accretable difference			8,097			8,296			16,393
	Disposals/transfers			(368	)		(224	)		(592	)
	Accretion			(3,556	)		(33,522	)		(37,078	)
	Balance at end of period		$	7,456		$	298,190		$	305,646
Summary of Purchased Credit-Impaired Loans, Information Identified in Corporation's Acquisition of BCSB	'
	Following is information about PCI loans identified in the Corporation’s acquisition of BCSB:
			At			September 30,
			Acquisition			2014
	Outstanding balance		$	10,470		$	—
	Carrying amount			4,340			—
	Allowance for loan losses			n/a			—
	Impairment recognized since acquisition			n/a			275
	Allowance reduction recognized since acquisition			n/a			275
Summary of Information about Corporation's Purchased Credit-Impaired Loans	'
	Following is information about PCI loans. The table below does not include impaired loans from the OBA acquisition because their values are expected to be immaterial, are preliminary in nature and are subject to refinement as additional information becomes available.
			Outstanding			Non-Accretable			Expected			Accretable			Recorded
			Balance			Difference			Cash Flows			Yield			Investment
	For the Nine Months Ended September 30, 2014
	Balance at beginning of period		$	56,500		$	(26,852	)	$	29,648		$	(7,456	)	$	22,192
	Acquisitions			10,470			(5,426	)		5,044			(704	)		4,340
	Accretion			—			—			—			4,530			4,530
	Payments received			(21,000	)		1,877			(19,123	)		—			(19,123	)
	Reclass from non-accretable difference			—			2,612			2,612			(2,612	)		—
	Disposals/transfers			(25,900	)		19,299			(6,601	)		2,938			(3,663	)
	Contractual interest			2,102			(2,102	)		—			—			—
	Balance at end of period		$	22,172		$	(10,592	)	$	11,580		$	(3,304	)	$	8,276
	For the Year Ended December 31, 2013
	Balance at beginning of period		$	41,134		$	(23,733	)	$	17,401		$	(778	)	$	16,623
	Acquisitions			42,031			(24,266	)		17,765			(2,505	)		15,260
	Accretion			—			—			—			3,556			3,556
	Payments received			(10,670	)		1,345			(9,325	)		—			(9,325	)
	Reclass from non-accretable difference			—			8,097			8,097			(8,097	)		—
	Disposals/transfers			(18,695	)		14,405			(4,290	)		368			(3,922	)
	Contractual interest			2,700			(2,700	)		—			—			—
	Balance at end of period		$	56,500		$	(26,852	)	$	29,648		$	(7,456	)	$	22,192
Summary of Non-Performing Assets	'
	Following is a summary of non-performing assets:
			September 30,			December 31,
			2014			2013
	Non-accrual loans		$	55,095		$	58,755
	Troubled debt restructurings			21,797			18,698
	Total non-performing loans			76,892			77,453
	Other real estate owned (OREO)			39,040			40,681
	Total non-performing loans and OREO			115,932			118,134
	Non-performing investments			—			797
	Total non-performing assets		$	115,932		$	118,931
	Asset quality ratios:
	Non-performing loans as a percent of total loans			0.7	%		0.81	%
	Non-performing loans + OREO as a percent of total loans + OREO			1.05	%		1.24	%
	Non-performing assets as a percent of total assets			0.74	%		0.88	%
Age Analysis of Past Due Loans, by Class	'
	The following tables provide an analysis of the aging of the Corporation’s past due loans by class, segregated by loans originated and loans acquired:
			30-89 Days			>90 Days			Non-Accrual			Total			Current			Total
			Past Due			Past Due and						Past Due						Loans
						Still Accruing
	Originated loans:
	September 30, 2014
	Commercial real estate		$	3,711		$	132		$	33,710		$	37,553		$	2,892,593		$	2,930,146
	Commercial and industrial			2,478			6			8,439			10,923			2,093,636			2,104,559
	Commercial leases			985			—			651			1,636			169,979			171,615
	Total commercial loans and leases			7,174			138			42,800			50,112			5,156,208			5,206,320
	Direct installment			11,102			3,498			6,761			21,361			1,487,735			1,509,096
	Residential mortgages			9,646			2,242			3,471			15,359			747,384			762,743
	Indirect installment			5,255			536			1,190			6,981			796,220			803,201
	Consumer lines of credit			2,581			646			873			4,100			910,907			915,007
	Other			141			25			—			166			54,095			54,261
			$	35,899		$	7,085		$	55,095		$	98,079		$	9,152,549		$	9,250,628
	December 31, 2013
	Commercial real estate		$	5,428		$	252		$	40,960		$	46,640		$	2,593,788		$	2,640,428
	Commercial and industrial			2,066			8			6,643			8,717			1,752,951			1,761,668
	Commercial leases			714			—			734			1,448			157,447			158,895
	Total commercial loans and leases			8,208			260			48,337			56,805			4,504,186			4,560,991
	Direct installment			9,038			3,753			4,686			17,477			1,370,518			1,387,995
	Residential mortgages			12,681			2,401			4,260			19,342			658,885			678,227
	Indirect installment			5,653			471			1,060			7,184			642,517			649,701
	Consumer lines of credit			1,737			1,076			412			3,225			829,443			832,668
	Other			25			10			—			35			45,148			45,183
			$	37,342		$	7,971		$	58,755		$	104,068		$	8,050,697		$	8,154,765
			30-89			> 90 Days			Non-Accrual			Total			Current			Discount			Total
			Days			Past Due						Past									Loans
			Past Due			and Still						Due (1)
						Accruing
	Acquired Loans:
	September 30, 2014
	Commercial real estate		$	14,415		$	14,019			—		$	28,434		$	866,319		$	(34,735	)	$	860,018
	Commercial and industrial			350			2,306			—			2,656			147,605			(7,215	)		143,046
	Commercial leases			—			—			—			—			—			—			—
	Total commercial loans and leases			14,765			16,325			—			31,090			1,013,924			(41,950	)		1,003,064
	Direct installment			1,280			1,399			—			2,679			65,972			1,565			70,216
	Residential mortgages			11,010			18,573			—			29,583			479,330			(39,860	)		469,053
	Indirect installment			45			22			—			67			2,991			(423	)		2,635
	Consumer lines of credit			2,091			2,917			—			5,008			174,706			(7,450	)		172,264
	Other			—			—			—			—			—			—			—
			$	29,191		$	39,236			—		$	68,427		$	1,736,923		$	(88,118	)	$	1,717,232
	December 31, 2013
	Commercial real estate		$	13,637		$	20,668			—		$	34,305		$	619,197		$	(48,721	)	$	604,781
	Commercial and industrial			1,860			1,899			—			3,759			124,415			(8,368	)		119,806
	Commercial leases			—			—			—			—			—			—			—
	Total commercial loans and leases			15,497			22,567			—			38,064			743,612			(57,089	)		724,587
	Direct installment			1,447			1,178			—			2,625			74,917			1,699			79,241
	Residential mortgages			11,464			19,298			—			30,762			412,704			(34,954	)		408,512
	Indirect installment			205			31			—			236			6,267			(617	)		5,886
	Consumer lines of credit			1,592			2,749			—			4,341			135,699			(6,937	)		133,103
	Other			—			—			—			—			—			—			—
			$	30,205		$	45,823			—		$	76,028		$	1,373,199		$	(97,898	)	$	1,351,329
	-1	Past due information for acquired loans is based on the contractual balance outstanding at September 30, 2014 and December 31, 2013.
Summary of Commercial Loans by Credit Quality	'
	The following tables present a summary of the Corporation’s commercial loans by credit quality category, segregated by loans originated and loans acquired:
			Commercial Loan Credit Quality Categories
			Pass			Special			Substandard			Doubtful			Total
						Mention
	Originated Loans:
	September 30, 2014
	Commercial real estate		$	2,784,908		$	52,952		$	91,385		$	901		$	2,930,146
	Commercial and industrial			1,973,472			80,128			50,086			873			2,104,559
	Commercial leases			170,465			291			859			—			171,615
			$	4,928,845		$	133,371		$	142,330		$	1,774		$	5,206,320
	December 31, 2013
	Commercial real estate		$	2,476,988		$	56,140		$	106,599		$	701		$	2,640,428
	Commercial and industrial			1,611,530			97,675			52,322			141			1,761,668
	Commercial leases			155,991			1,945			959			—			158,895
			$	4,244,509		$	155,760		$	159,880		$	842		$	4,560,991
	Acquired Loans:
	September 30, 2014
	Commercial real estate		$	661,300		$	91,116		$	107,430		$	172		$	860,018
	Commercial and industrial			119,457			5,447			18,142			—			143,046
	Commercial leases			—			—			—			—			—
			$	780,757		$	96,563		$	125,572		$	172		$	1,003,064
	December 31, 2013
	Commercial real estate		$	442,604		$	74,315		$	85,086		$	2,776		$	604,781
	Commercial and industrial			100,743			6,182			12,866			15			119,806
	Commercial leases			—			—			—			—			—
			$	543,347		$	80,497		$	97,952		$	2,791		$	724,587
Summary of Consumer Loans by Payment Status	'
	Following is a table showing originated consumer loans by payment status:
			Consumer Loan Credit Quality
			by Payment Status
			Performing			Non-Performing			Total
	September 30, 2014
	Direct installment		$	1,495,276		$	13,820		$	1,509,096
	Residential mortgages			747,276			15,467			762,743
	Indirect installment			801,862			1,339			803,201
	Consumer lines of credit			913,224			1,783			915,007
	Other			53,610			651			54,261
	December 31, 2013
	Direct installment		$	1,377,418		$	10,577		$	1,387,995
	Residential mortgages			664,214			14,013			678,227
	Indirect installment			648,499			1,202			649,701
	Consumer lines of credit			832,071			597			832,668
	Other			45,183			—			45,183
Summary of Impaired Loans, by Class	'
	Following is a summary of information pertaining to originated loans considered to be impaired, by class of loans:
			Recorded			Unpaid			Specific			Average
			Investment			Principal			Related			Recorded
						Balance			Allowance			Investment
	At or For the Nine Months Ended September 30, 2014
	With no specific allowance recorded:
	Commercial real estate		$	24,718		$	33,948		$	—		$	31,351
	Commercial and industrial			7,494			9,191			—			7,455
	Commercial leases			651			651			—			719
	Total commercial loans and leases			32,863			43,790			—			39,525
	Direct installment			13,820			14,189			—			13,226
	Residential mortgages			15,467			17,397			—			15,662
	Indirect installment			1,339			1,504			—			1,436
	Consumer lines of credit			1,783			1,791			—			1,695
	Other			—			—			—			—
	With a specific allowance recorded:
	Commercial real estate			10,571			23,263			901			6,688
	Commercial and industrial			1,966			1,995			870			2,195
	Commercial leases			—			—			—			—
	Total commercial loans and leases			12,537			25,258			1,771			8,883
	Direct installment			—			—			—			—
	Residential mortgages			—			—			—			—
	Indirect installment			—			—			—			—
	Consumer lines of credit			—			—			—			—
	Other			—			—			—			—
	Total:
	Commercial real estate			35,289			57,211			901			38,039
	Commercial and industrial			9,460			11,186			870			9,650
	Commercial leases			651			651			—			719
	Total commercial loans and leases			45,400			69,048			1,771			48,408
	Direct installment			13,820			14,189			—			13,226
	Residential mortgages			15,467			17,397			—			15,662
	Indirect installment			1,339			1,504			—			1,436
	Consumer lines of credit			1,783			1,791			—			1,695
	Other			—			—			—			—
			Recorded			Unpaid			Specific			Average
			Investment			Principal			Related			Recorded
						Balance			Allowance			Investment
	At or For the Year Ended December 31, 2013
	With no specific allowance recorded:
	Commercial real estate		$	40,472		$	62,034		$	—		$	37,376
	Commercial and industrial			7,301			8,669			—			8,304
	Commercial leases			734			734			—			758
	Total commercial loans and leases			48,507			71,437			—			46,438
	Direct installment			10,577			10,830			—			10,557
	Residential mortgages			14,012			14,560			—			13,565
	Indirect installment			1,202			2,633			—			1,127
	Consumer lines of credit			597			668			—			573
	Other			—			—			—			—
	With a specific allowance recorded:
	Commercial real estate			3,603			3,818			701			14,379
	Commercial and industrial			122			130			123			126
	Commercial leases			—			—			—			—
	Total commercial loans and leases			3,725			3,948			824			14,505
	Direct installment			—			—			—			—
	Residential mortgages			—			—			—			—
	Indirect installment			—			—			—			—
	Consumer lines of credit			—			—			—			—
	Other			—			—			—			—
	Total:
	Commercial real estate			44,075			65,852			701			51,755
	Commercial and industrial			7,423			8,799			123			8,430
	Commercial leases			734			734			—			758
Total commercial loans and leases			52,232			75,385			824			60,943
Direct installment			10,577			10,830			—			10,557
Residential mortgages			14,012			14,560			—			13,565
Indirect installment			1,202			2,633			—			1,127
Consumer lines of credit			597			668			—			573
Other			—			—			—			—
Summary of Payment Status of Total TDRs	'
	Following is a summary of the payment status of total TDRs:
			September 30,			December 31,
			2014			2013
	Accruing:
	Performing		$	9,899		$	10,220
	Non-performing			21,797			18,698
	Non-accrual			9,677			12,705
			$	41,373		$	41,623
Summary of Troubled Debt Restructurings by Class of Loans	'
	The majority of TDRs are the result of interest rate concessions for a limited period of time. Following is a summary of loans, by class, that have been restructured during the periods indicated:
			Three Months Ended September 30, 2014									Nine Months Ended September 30, 2014
			Number			Pre-Modification			Post-			Number			Pre-Modification			Post-
			of			Outstanding			Modification			of			Outstanding			Modification
			Contracts			Recorded			Outstanding			Contracts			Recorded			Outstanding
						Investment			Recorded						Investment			Recorded
									Investment									Investment
	Commercial real estate			1		$	50		$	48			10		$	2,633		$	2,187
	Commercial and industrial			2			126			119			3			323			307
	Commercial leases			—			—			—			—			—			—
	Total commercial loans and leases			3			176			167			13			2,956			2,494
	Direct installment			116			1,323			1,240			378			4,922			4,693
	Residential mortgages			9			480			470			33			1,847			1,784
	Indirect installment			7			18			15			20			52			48
	Consumer lines of credit			6			88			56			31			899			857
	Other			—			—			—			—			—			—
				141		$	2,085		$	1,948			475		$	10,676		$	9,876
			Three Months Ended September 30, 2013									Nine Months Ended September 30, 2013
			Number			Pre-Modification			Post-			Number			Pre-Modification			Post-
			of			Outstanding			Modification			of			Outstanding			Modification
			Contracts			Recorded			Outstanding			Contracts			Recorded			Outstanding
						Investment			Recorded						Investment			Recorded
									Investment									Investment
	Commercial real estate			2		$	212		$	207			7		$	1,252		$	1,031
	Commercial and industrial			—			—			—			—			—			—
	Commercial leases			—			—			—			—			—			—
	Total commercial loans and leases			2			212			207			7			1,252			1,031
	Direct installment			117			1,199			1,168			300			3,078			2,930
	Residential mortgages			9			346			348			39			1,809			1,784
	Indirect installment			5			20			18			20			92			84
	Consumer lines of credit			1			6			6			14			207			204
	Other			—			—			—			—			—			—
				134		$	1,783		$	1,747			380		$	6,438		$	6,033
Summary of Troubled Debt Restructurings by Class of Loans, Payment Default	'
	Following is a summary of TDRs, by class of loans, for which there was a payment default, excluding loans that were either charged-off or cured by period end. Default occurs when a loan is 90 days or more past due and is within 12 months of restructuring.
			Three Months Ended						Nine Months Ended
			September 30, 2014 (1)						September 30, 2014 (1)
			Number of			Recorded			Number of			Recorded
			Contracts			Investment			Contracts			Investment
	Commercial real estate			—		$	—			—		$	—
	Commercial and industrial			—			—			—			—
	Commercial leases			—			—			—			—
	Total commercial loans and leases			—			—			—			—
	Direct installment			41			356			80			732
	Residential mortgages			2			33			2			33
	Indirect installment			3			10			4			11
	Consumer lines of credit			1			50			1			50
	Other			—			—			—			—
				47		$	449			87		$	826
			Three Months Ended						Nine Months Ended
			September 30, 2013 (1)						September 30, 2013 (1)
			Number of			Recorded			Number of			Recorded
			Contracts			Investment			Contracts			Investment
	Commercial real estate			—		$	—			1		$	751
	Commercial and industrial			—			—			1			15
	Commercial leases			—			—			—			—
	Total commercial loans and leases			—			—			2			766
	Direct installment			24			254			53			509
	Residential mortgages			2			99			5			240
	Indirect installment			—			—			4			37
	Consumer lines of credit			1			85			1			85
	Other			—			—			—			—
				27		$	438			65		$	1,637
	-1	The recorded investment is as of period end.
Summary of Changes in Allowance for Loan Losses by Class	'
	Following is a summary of changes in the allowance for loan losses, by loan class:
			Balance at			Charge-			Recoveries			Net			Provision			Balance at
			Beginning			Offs						Charge-			for Loan			End of
			of Period									Offs			Losses			Period
	Three Months Ended September 30, 2014
	Commercial real estate		$	38,478		$	(1,724	)	$	506		$	(1,218	)	$	(80	)	$	37,180
	Commercial and industrial			33,017			(1,796	)		192			(1,604	)		2,883			34,296
	Commercial leases			2,079			(167	)		11			(156	)		282			2,205
	Total commercial loans and leases			73,574			(3,687	)		709			(2,978	)		3,085			73,681
	Direct installment			16,844			(2,369	)		271			(2,098	)		4,814			19,560
	Residential mortgages			5,506			(87	)		13			(74	)		1,218			6,650
	Indirect installment			6,693			(898	)		211			(687	)		364			6,370
	Consumer lines of credit			7,664			(360	)		50			(310	)		587			7,941
	Other			907			(341	)		9			(332	)		(208	)		367
	Total allowance on originated loans			111,188			(7,742	)		1,263			(6,479	)		9,860			114,569
	Purchased credit-impaired loans			448			(712	)		1			(711	)		1,026			763
	Other acquired loans			5,112			(113	)		(41	)		(154	)		311			5,269
	Total allowance on acquired loans			5,560			(825	)		(40	)		(865	)		1,337			6,032
	Total allowance		$	116,748		$	(8,567	)	$	1,223		$	(7,344	)	$	11,197		$	120,601
	Nine Months Ended September 30, 2014
	Commercial real estate		$	32,548		$	(5,519	)	$	1,068		$	(4,451	)	$	9,083		$	37,180
	Commercial and industrial			32,603			(2,849	)		730			(2,119	)		3,812			34,296
	Commercial leases			1,903			(317	)		93			(224	)		526			2,205
	Total commercial loans and leases			67,054			(8,685	)		1,891			(6,794	)		13,421			73,681
	Direct installment			17,824			(7,154	)		821			(6,333	)		8,069			19,560
	Residential mortgages			5,836			(356	)		61			(295	)		1,109			6,650
	Indirect installment			6,409			(2,396	)		658			(1,738	)		1,699			6,370
	Consumer lines of credit			7,231			(1,023	)		143			(880	)		1,590			7,941
	Other			530			(910	)		19			(891	)		728			367
	Total allowance on originated loans			104,884			(20,524	)		3,593			(16,931	)		26,616			114,569
	Purchased credit-impaired loans			1,000			(2,614	)		1			(2,613	)		2,376			763
	Other acquired loans			4,900			(230	)		983			753			(384	)		5,269
	Total allowance on acquired loans			5,900			(2,844	)		984			(1,860	)		1,992			6,032
	Total allowance		$	110,784		$	(23,368	)	$	4,577		$	(18,791	)	$	28,608		$	120,601
			Balance at			Charge-			Recoveries			Net			Provision			Balance at
			Beginning			Offs						Charge-			for Loan			End of
			of Period									Offs			Losses			Period
	Three Months Ended September 30, 2013
	Commercial real estate		$	35,666		$	(365	)	$	80		$	(285	)	$	(538	)	$	34,843
	Commercial and industrial			32,486			(1,529	)		231			(1,298	)		1,460			32,648
	Commercial leases			1,756			(69	)		59			(10	)		21			1,767
	Total commercial loans and leases			69,908			(1,963	)		370			(1,593	)		943			69,258
	Direct installment			15,993			(2,183	)		227			(1,956	)		3,194			17,231
	Residential mortgages			5,120			(174	)		50			(124	)		437			5,433
	Indirect installment			5,626			(807	)		188			(619	)		1,120			6,127
	Consumer lines of credit			6,421			(454	)		660			(394	)		1,052			7,079
	Other			(219	)		(333	)		—			(333	)		760			208
	Total allowance on originated loans			102,849			(5,914	)		895			(5,019	)		7,506			105,336
	Purchased credit-impaired loans			325			—			—			—			337			662
	Other acquired loans			5,106			70			(559	)		(489	)		(563	)		4,054
	Total allowance on acquired loans			5,431			70			(559	)		(489	)		(226	)		4,716
	Total allowance		$	108,280		$	(5,844	)	$	336		$	(5,508	)	$	7,280		$	110,052
	Nine Months Ended September 30, 2013
	Commercial real estate		$	34,810		$	(3,067	)	$	1,606		$	(1,461	)	$	1,494		$	34,843
	Commercial and industrial			31,849			(4,262	)		734			(3,528	)		4,327			32,648
	Commercial leases			1,744			(317	)		161			(156	)		179			1,767
	Total commercial loans and leases			68,403			(7,646	)		2,501			(5,145	)		6,000			69,258
	Direct installment			15,130			(6,824	)		709			(6,115	)		8,216			17,231
	Residential mortgages			5,155			(733	)		90			(643	)		921			5,433
	Indirect installment			5,449			(2,349	)		576			(1,773	)		2,451			6,127
	Consumer lines of credit			6,057			(1,183	)		209			(974	)		1,996			7,079
	Other			—			(721	)		—			(721	)		929			208
	Total allowance on originated loans			100,194			(19,456	)		4,085			(15,371	)		20,513			105,336
Purchased credit-impaired loans			759			(156	)		—			(156	)		59			662
Other acquired loans			3,421			(1,199	)		(320	)		(1,519	)		2,152			4,054
Total allowance on acquired loans			4,180			(1,355	)		(320	)		(1,675	)		2,211			4,716
Total allowance		$	104,374		$	(20,811	)	$	3,765		$	(17,046	)	$	22,724		$	110,052
Summary of Individual and Collective Allowance for Loan Losses and Loan Balances by Class	'
	Following is a summary of the individual and collective originated allowance for loan losses and corresponding loan balances by class:
			Allowance						Loans Outstanding
			Individually			Collectively			Loans			Individually			Collectively
			Evaluated for			Evaluated for						Evaluated for			Evaluated for
			Impairment			Impairment						Impairment			Impairment
	September 30, 2014
	Commercial real estate		$	901		$	36,279		$	2,930,146		$	21,619		$	2,908,527
	Commercial and industrial			870			33,426			2,104,559			5,966			2,098,593
	Commercial leases			—			2,205			171,615			—			171,615
	Total commercial loans and leases			1,771			71,910			5,206,320			27,585			5,178,735
	Direct installment			—			19,560			1,509,096			—			1,509,096
	Residential mortgages			—			6,650			762,743			—			762,743
	Indirect installment			—			6,370			803,201			—			803,201
	Consumer lines of credit			—			7,941			915,007			—			915,007
	Other			—			367			54,261			—			54,261
			$	1,771		$	112,798		$	9,250,628		$	27,585		$	9,223,043
	December 31, 2013
	Commercial real estate		$	701		$	31,847		$	2,640,428		$	30,133		$	2,610,295
	Commercial and industrial			123			32,480			1,761,668			4,243			1,757,425
	Commercial leases			—			1,903			158,895			—			158,895
	Total commercial loans and leases			824			66,230			4,560,991			34,376			4,526,615
	Direct installment			—			17,824			1,387,995			—			1,387,995
	Residential mortgages			—			5,836			678,227			—			678,227
	Indirect installment			—			6,409			649,701			—			649,701
	Consumer lines of credit			—			7,231			832,668			—			832,668
	Other			—			530			45,183			—			45,183
			$	824		$	104,060		$	8,154,765		$	34,376		$	8,120,389

Borrowings_Tables

Borrowings (Tables)	9 Months Ended
	Sep. 30, 2014
Debt Disclosure [Abstract]	'
Summary of Short-Term Borrowings	'
	Following is a summary of short-term borrowings:
		September 30,		December 31,
		2014		2013
	Securities sold under repurchase agreements	$	857,217	$	841,741
	Federal Home Loan Bank advances		450,000		—
	Federal funds purchased		165,000		270,000
	Subordinated notes		128,950		129,498
		$	1,601,167	$	1,241,239
Summary of Long-Term Debt	'
	Following is a summary of long-term debt:
		September 30,		December 31,
		2014		2013
	Federal Home Loan Bank advances	$	400,056	$	50,076
	Subordinated notes		83,133		84,637
	Other subordinated debt		—		8,637
	Convertible debt		—		578
		$	483,189	$	143,928

Junior_Subordinated_Debt_Table

Junior Subordinated Debt (Tables)	9 Months Ended
	Sep. 30, 2014
Text Block [Abstract]	'
Junior Subordinated Debt Trusts	'
	The following table provides information relating to the Trusts as of September 30, 2014:
		Trust		Common		Junior		Stated		Interest
		Preferred		Securities		Subordinated		Maturity		Rate
		Securities				Debt		Date
	F.N.B. Statutory Trust II	$	21,500	$	665	$	22,165		6/15/36		1.88	%	Variable; LIBOR + 165
													basis points (bps)
	Omega Financial Capital Trust I		36,000		1,114		36,068		10/18/34		2.42	%	Variable; LIBOR + 219 bps
		$	57,500	$	1,779	$	58,233

Derivative_Instruments_Tables

Derivative Instruments (Tables)	9 Months Ended
	Sep. 30, 2014
Derivative Assets	'
		Gross		Gross			Net Amount
		Amount		Amounts			Presented in
				Offset in			the Balance
				the Balance			Sheet
				Sheet
	Offsetting of Derivative Assets:
	September 30, 2014
	Derivative assets subject to master netting arrangement:
	Interest rate contracts	$	1,698		—		$	1,698
	Equity contracts		50		—			50
	Derivative assets not subject to master netting arrangement:
	Interest rate contracts		32,880		—			32,880
	Total derivative assets	$	34,628		—		$	34,628
	December 31, 2013
	Derivative assets subject to master netting arrangement:
	Interest rate contracts	$	3,547		—		$	3,547
	Equity contracts		32		—			32
	Derivative assets not subject to master netting arrangement:
	Interest rate contracts		29,738		—			29,738
	Total derivative assets	$	33,317		—		$	33,317
Derivative Liabilities	'
		Gross		Gross			Net Amount
		Amount		Amounts			Presented in
				Offset in			the Balance
				the Balance			Sheet
				Sheet
	Offsetting of Derivative Liabilities:
	September 30, 2014
	Derivative liabilities subject to master netting arrangement:
	Interest rate contracts	$	37,565		—		$	37,565
	Derivative liabilities not subject to master netting arrangement:
	Interest rate contracts		1,040		—			1,040
	Equity contracts		50		—			50
	Total derivative liabilities	$	38,655		—		$	38,655
	December 31, 2013
	Derivative liabilities subject to master netting arrangement:
	Interest rate contracts	$	40,323		—		$	40,323
	Derivative liabilities not subject to master netting arrangement:
	Interest rate contracts		3,014		—			3,014
	Equity contracts		32		—			32
	Total derivative liabilities	$	43,369		—		$	43,369
Effect of Corporation's Derivative Financial Instruments on Income Statement	'
	The following table presents the effect of the Corporation’s derivative financial instruments on the income statement:
		Income		Nine Months Ended
		Statement		September 30,
		Location		2014			2013
	Interest Rate Products		Other income	$	(9	)	$	40
Collateral Held By Counterparty [Member]	'
Derivative Assets	'
				Gross Amounts Not Offset in the
				Balance Sheet
		Net Amount		Financial			Cash		Net Amount
		Presented in the		Instruments			Collateral
		Balance Sheet					Received
	Derivative Assets:
	September 30, 2014
	Counterparty B	$	30	$	30		$	—		—
	Counterparty D		67		67			—		—
	Counterparty E		657		657			—		—
	Counterparty F		137		137			—		—
	Counterparty G		71		71			—		—
	Counterparty I		232		232			—		—
	Counterparty J		554		—			554		—
		$	1,748	$	1,194		$	554		—
	December 31, 2013
	Counterparty B	$	24	$	24		$	—	$	—
	Counterparty D		566		566			—		—
	Counterparty E		1,696		1,696			—		—
	Counterparty F		355		273			—		82
	Counterparty G		251		251			—		—
	Counterparty I		634		634			—		—
	Counterparty J		53		—			53		—
		$	3,579	$	3,444		$	53	$	82
Derivative Liabilities	'
				Gross Amounts Not Offset in the
				Balance Sheet
		Net Amount		Financial			Cash		Net Amount
		Presented in the		Instruments			Collateral
		Balance Sheet					Received
	Derivative Liabilities:
	September 30, 2014
	Counterparty A	$	4,033	$	4,033		$	—	$	—
	Counterparty B		1,882		1,882			—		—
	Counterparty C		1,160		1,160			—		—
	Counterparty D		7,105		7,105			—		—
	Counterparty E		3,509		3,509			—		—
	Counterparty F		719		667			—		52
	Counterparty G		4,146		4,146			—		—
	Counterparty H		1,761		—			—		1,761
	Counterparty I		5,399		5,399			—		—
	Counterparty J		7,851		—			7,851		—
		$	37,565	$	27,901		$	7,851	$	1,813
	December 31, 2013
	Counterparty A	$	4,934	$	4,934		$	—	$	—
	Counterparty B		3,249		3,249			—		—
	Counterparty C		1,431		1,431			—		—
	Counterparty D		9,614		9,614			—		—
	Counterparty E		6,257		6,257			—		—
	Counterparty F		13		13			—		—
	Counterparty G		5,309		5,309			—		—
	Counterparty H		2,257		125			—		2,132
	Counterparty I		5,649		5,649			—		—
	Counterparty J		1,610		—			1,610		—
		$	40,323	$	36,581		$	1,610	$	2,132

Commitments_Credit_Risk_and_Co1

Commitments, Credit Risk and Contingencies (Tables)	9 Months Ended
	Sep. 30, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Summary of Off-Balance Sheet Credit Risk Information	'
	Following is a summary of off-balance sheet credit risk information:
		September 30,		December 31,
		2014		2013
	Commitments to extend credit	$	3,445,792	$	2,897,748
	Standby letters of credit		122,290		114,298

Stock_Incentive_Plans_Tables

Stock Incentive Plans (Tables)	9 Months Ended
	Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Summary of Information Concerning Restricted Stock Awards	'
	The following table summarizes certain information concerning restricted stock awards:
		Nine Months Ended September 30,
		2014					2013
		Awards			Weighted		Awards			Weighted
					Average					Average
					Grant					Grant
					Price					Price
	Unvested awards outstanding at beginning of period		1,729,033		$	10.23		1,913,073		$	9.17
	Granted		364,065			13.61		344,479			11.04
	Net adjustment due to performance		(87,512	)		11.41		73,835			10.6
	Vested		(703,428	)		8.79		(734,129	)		7.6
	Forfeited		(50,849	)		11.47		(37,175	)		10.4
	Dividend reinvestment		34,521			12.73		43,934			11.66
	Unvested awards outstanding at end of period		1,285,830			11.9		1,604,017			10.26
Components of Restricted Stock Awards	'
	The components of the restricted stock awards as of September 30, 2014 are as follows:
		Service-			Performance-		Total
		Based			Based
		Awards			Awards
	Unvested awards		498,890			786,940		1,285,830
	Unrecognized compensation expense	$	3,367		$	2,583	$	5,950
	Intrinsic value	$	5,982		$	9,435	$	15,417
	Weighted average remaining life (in years)		2.26			2.1		2.16
Summary of Information Concerning Stock Option Awards	'
	The following table summarizes certain information concerning stock option awards:
		Nine Months Ended September 30,
		2014					2013
		Shares			Weighted		Shares			Weighted
					Average					Average
					Exercise					Exercise
					Price					Price
	Options outstanding at beginning of period		533,524		$	11.5		640,050		$	13.21
	Assumed from acquisition		805,507			7.39		19,223			7.92
	Exercised		(140,817	)		6.21		(36,647	)		8.9
	Forfeited		(54,962	)		24.41		(298,150	)		15.1
	Options outstanding and exercisable at end of period		1,143,252			8.64		324,476			11.65

Retirement_Plans_Tables

Retirement Plans (Tables)	9 Months Ended
	Sep. 30, 2014
Compensation and Retirement Disclosure [Abstract]	'
Net Periodic Benefit Credit for Defined Benefit Plans	'
	The net periodic benefit credit for the defined benefit plans includes the following components:
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2014			2013			2014			2013
	Service cost	$	15		$	15		$	47		$	51
	Interest cost		1,610			1,437			4,802			4,291
	Expected return on plan assets		(2,486	)		(2,271	)		(7,460	)		(6,811	)
	Amortization:
	Unrecognized net transition asset		(6	)		(24	)		(16	)		(70	)
	Unrecognized prior service cost		2			2			6			6
	Unrecognized loss		347			575			1,021			1,689
	Net periodic pension credit	$	(518	)	$	(266	)	$	(1,600	)	$	(844	)

Comprehensive_Income_Tables

Comprehensive Income (Tables)	9 Months Ended
	Sep. 30, 2014
Equity [Abstract]	'
Components of Comprehensive Income, Net of Related Tax	'
	The components of comprehensive income, net of related tax, are as follows:
			Three Months Ended						Nine Months Ended
			September 30,						September 30,
			2014			2013			2014			2013
	Net income		$	35,391		$	31,634		$	104,746		$	89,365
	Other comprehensive (loss) income:
	Securities available for sale:
	Unrealized (losses) gains arising during the period, net of tax (benefit) expense of $(1,551), $(2,635), $7,065 and $(8,835)			(2,881	)		(4,894	)		13,120			(16,408	)
	Reversal of non-credit related losses on debt securities not expected to be sold, net of tax expense of $3,335			—			—			6,192			—
	Reclassification adjustment for gains included in net income, net of tax expense of $412, $2, $3,995 and $260			(766	)		(3	)		(7,420	)		(483	)
	Derivative instruments:
	Unrealized (losses) gains arising during the period, net of tax (benefit) expense of $(253), $239, $2,112 and $(2,215)			(469	)		443			3,922			(4,113	)
	Pension and postretirement benefit obligations:
	Unrealized gains arising during the period, net of tax expense of $121, $194, $355 and $569			224			360			659			1,057
	Other comprehensive (loss) income			(3,892	)		(4,094	)		16,473			(19,947	)
	Comprehensive income		$	31,499		$	27,540		$	121,219		$	69,418
Changes in Accumulated Other Comprehensive Income, Net of Tax, by Component	'
	The following table presents changes in accumulated other comprehensive income, net of tax, by component:
			Unrealized			Non-Credit			Unrealized			Unrecognized			Total
			Net Gains			Related Loss			Losses on			Pension and
			(Losses) on			on Debt			Derivative			Postretirement
			Securities			Securities not			Instruments			Obligations
			Available			Expected to
			for Sale			be Sold
	Nine Months Ended September 30, 2014
	Balance at beginning of period		$	(11,874	)	$	(6,192	)	$	(6,586	)	$	(32,272	)	$	(56,924	)
	Other comprehensive income (loss) before reclassifications			13,120			6,192			3,922			659			23,893
	Amounts reclassified from accumulated other comprehensive income			(7,420	)		—			—			—			(7,420	)
	Net current period other comprehensive income (loss)			5,700			6,192			3,922			659			16,473
	Balance at end of period		$	(6,174	)	$	—		$	(2,664	)	$	(31,613	)	$	(40,451	)
Summary of Reclassifications Out of Accumulated Other Comprehensive Income	'
	The following table presents a summary of the reclassifications out of accumulated other comprehensive income:
	Nine Months Ended September 30, 2014
	Details About Accumulated Other		Amount			Affected Line Item
			Reclassified from			in the Statement
	Comprehensive Income Component		Other			where Net Income
			Comprehensive			is Presented
			Income
	Unrealized net gains on securities available for sale (1)		$	(11,415	)	Net securities gains
				(3,995	)	Tax expense
			$	(7,420	)
	-1	For additional detail related to unrealized net gains on securities available for sale and related amounts reclassified from accumulated other comprehensive income see the “Securities” note in this Report.

Earnings_Per_Common_Share_Tabl

Earnings Per Common Share (Tables)	9 Months Ended
	Sep. 30, 2014
Earnings Per Share [Abstract]	'
Computation of Basic and Diluted Earnings Per Common Share	'
	The following table sets forth the computation of basic and diluted earnings per common share:
		Three Months Ended				Nine Months Ended
		September 30,				September 30,
		2014		2013		2014		2013
	Net income	$	35,391	$	31,634	$	104,746	$	89,365
	Less: Preferred stock dividends		2,010		—		6,342		—
	Net income available to common stockholders	$	33,381	$	31,634	$	98,404	$	89,365
	Basic weighted average common shares outstanding		167,260,386		144,759,887		165,229,206		142,949,134
	Net effect of dilutive stock options, warrants, restricted stock and convertible debt		1,623,741		1,686,555		1,695,637		1,520,683
	Diluted weighted average common shares outstanding		168,884,127		146,446,442		166,924,843		144,469,817
	Earnings per common share:
	Basic	$	0.2	$	0.22	$	0.6	$	0.63
	Diluted	$	0.2	$	0.22	$	0.59	$	0.62

Cash_Flow_Information_Tables

Cash Flow Information (Tables)	9 Months Ended
	Sep. 30, 2014
Supplemental Cash Flow Elements [Abstract]	'
Summary of Cash Flow Information	'
	Following is a summary of supplemental cash flow information:
	Nine Months Ended September 30	2014		2013
	Interest paid on deposits and other borrowings	$	31,804	$	36,340
	Income taxes paid		17,000		18,700
	Transfers of loans to other real estate owned		7,784		10,856
	Financing of other real estate owned sold		287		549

Business_Segments_Tables

Business Segments (Tables)	9 Months Ended
	Sep. 30, 2014
Segment Reporting [Abstract]	'
Financial Information for Segments of Corporation	'
	The following tables provide financial information for these segments of the Corporation. The information provided under the caption “Parent and Other” represents operations not considered to be reportable segments and/or general operating expenses of the Corporation, and includes the parent company, other non-bank subsidiaries and eliminations and adjustments which are necessary for purposes of reconciliation to the consolidated amounts.
		Community		Wealth		Insurance		Consumer		Parent and			Consolidated
		Banking		Management				Finance		Other
	At or for the Three Months Ended September 30, 2014
	Interest income	$	120,122	$	—	$	24	$	9,773	$	1,647		$	131,566
	Interest expense		9,435		—		—		826		686			10,947
	Net interest income		110,687		—		24		8,947		961			120,619
	Provision for loan losses		9,427		—		—		1,519		251			11,197
	Non-interest income		27,179		8,174		3,373		719		(1,893	)		37,552
	Non-interest expense		79,243		6,294		2,943		4,983		(71	)		93,392
	Intangible amortization		2,282		72		101		—		—			2,455
	Income tax expense (benefit)		14,347		656		128		1,216		(611	)		15,736
	Net income (loss)		32,567		1,152		225		1,948		(501	)		35,391
	Total assets		15,584,832		21,892		19,148		182,301		(51,128	)		15,757,045
	Total intangibles		856,464		10,792		10,223		1,809		—			879,288
		Community		Wealth		Insurance		Consumer		Parent and			Consolidated
		Banking		Management				Finance		Other
	At or for the Three Months Ended September 30, 2013
	Interest income	$	98,716	$	—	$	27	$	9,600	$	1,447		$	109,790
	Interest expense		7,552		—		—		839		2,145			10,536
	Net interest income		91,164		—		27		8,761		(698	)		99,254
	Provision for loan losses		5,432		—		—		1,725		123			7,280
	Non-interest income		24,317		6,916		3,222		681		(2,326	)		32,810
	Non-interest expense		68,091		5,850		2,799		4,724		(358	)		81,106
	Intangible amortization		1,890		76		101		—		—			2,067
	Income tax expense (benefit)		9,552		366		128		1,145		(1,214	)		9,977
	Net income (loss)		30,516		624		221		1,848		(1,575	)		31,634
	Total assets		12,610,043		19,614		19,788		182,695		(41,861	)		12,790,279
	Total intangibles		725,389		11,084		10,627		1,809		—			748,909
	At or for the Nine Months Ended September 30, 2014
	Interest income	$	339,974	$	—	$	74	$	28,716	$	5,122		$	373,886
	Interest expense		26,413		—		—		2,481		2,356			31,250
	Net interest income		313,561		—		74		26,235		2,766			342,636
	Provision for loan losses		23,148		—		—		4,754		706			28,608
	Non-interest income		86,512		23,530		10,582		2,120		(3,932	)		118,812
	Non-interest expense		231,390		19,038		8,900		14,800		1,270			275,398
	Intangible amortization		6,680		216		303		—		—			7,199
	Income tax expense (benefit)		41,738		1,555		521		3,386		(1,703	)		45,497
	Net income (loss)		97,117		2,721		932		5,415		(1,439	)		104,746
	Total assets		15,584,832		21,892		19,148		182,301		(51,128	)		15,757,045
	Total intangibles		856,454		10,792		10,223		1,809		—			879,288
	At or for the Nine Months Ended September 30, 2013
	Interest income	$	289,984	$	—	$	82	$	27,920	$	4,763		$	322,749
	Interest expense		24,449		—		—		2,533		6,671			33,653
	Net interest income		265,535		—		82		25,387		(1,908	)		289,096
	Provision for loan losses		17,283		—		—		4,930		511			22,724
	Non-interest income		73,955		21,294		10,024		2,029		(4,183	)		103,119
	Non-interest expense		198,395		18,338		8,420		14,063		823			240,039
	Intangible amortization		5,531		228		304		—		—			6,063
	Income tax expense (benefit)		32,486		1,009		497		3,234		(3,202	)		34,024
	Net income (loss)		85,795		1,719		885		5,189		(4,223	)		89,365
	Total assets		12,610,043		19,614		19,788		182,695		(41,861	)		12,790,279
	Total intangibles		725,389		11,084		10,627		1,809		—			748,909

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2014
Fair Value Disclosures [Abstract]	'
Balances of Assets and Liabilities Measured at Fair Value on Recurring Basis	'
	The following table presents the balances of assets and liabilities measured at fair value on a recurring basis:
		Level 1			Level 2			Level 3			Total
	September 30, 2014
	Assets measured at fair value
	Available for sale debt securities:
	U.S. Treasury	$	—		$	29,534		$	—		$	29,534
	U.S. government-sponsored entities		—			275,508			—			275,508
	Residential mortgage-backed securities
	Agency mortgage-backed securities		—			496,483			—			496,483
	Agency collateralized mortgage obligations		—			596,935			—			596,935
	Non-agency collateralized mortgage obligations		—			13			1,534			1,547
	Commercial mortgage-backed securities		—			8,036			—			8,036
	States of the U.S. and political subdivisions		—			13,894			—			13,894
	Other debt securities		—			16,478			—			16,478
			—			1,436,881			1,534			1,438,415
	Available for sale equity securities:
	Financial services industry		87			677			440			1,204
	Insurance services industry		116			—			—			116
			203			677			440			1,320
			203			1,437,558			1,974			1,439,735
	Derivative financial instruments:
	Trading		—			34,086			—			34,086
	Not for trading		—			542			—			542
			—			34,628			—			34,628
		$	203		$	1,472,186		$	1,974		$	1,474,363
	Liabilities measured at fair value
	Derivative financial instruments:
	Trading		—		$	34,013			—		$	34,013
	Not for trading		—			4,642			—			4,642
			—		$	38,655			—		$	38,655
		Level 1			Level 2			Level 3			Total
	December 31, 2013
	Assets measured at fair value
	Available for sale debt securities:
	U.S. government-sponsored entities	$	—		$	330,985		$	—		$	330,985
	Residential mortgage-backed securities
	Agency mortgage-backed securities		—			250,881			—			250,881
	Agency collateralized mortgage obligations		—			491,199			—			491,199
	Non-agency collateralized mortgage obligations		—			18			1,744			1,762
	States of the U.S. and political subdivisions		—			17,002			—			17,002
	Collateralized debt obligations		—			—			31,595			31,595
	Other debt securities		—			16,100			—			16,100
			—			1,106,185			33,339			1,139,524
	Available for sale equity securities:
	Financial services industry		584			1,067			410			2,061
	Insurance services industry		65			—			—			65
			649			1,067			410			2,126
			649			1,107,252			33,749			1,141,650
	Derivative financial instruments:
	Trading		—			33,317			—			33,317
	Not for trading		—			—			—			—
			—			33,317			—			33,317
		$	649		$	1,140,569		$	33,749		$	1,174,967
	Liabilities measured at fair value
	Derivative financial instruments:
	Trading		—		$	33,236			—		$	33,236
	Not for trading		—			10,133			—			10,133
			—		$	43,369			—		$	43,369
Additional Information about Assets Measured at Fair Value on Recurring Basis	'
	The following table presents additional information about assets measured at fair value on a recurring basis and for which the Corporation has utilized Level 3 inputs to determine fair value:
		Pooled Trust			Other			Equity			Residential			Total
		Preferred			Debt			Securities			Non-Agency
		Collateralized			Securities						Collateralized
		Debt									Mortgage
		Obligations									Obligations
	Nine Months Ended September 30, 2014
	Balance at beginning of period	$	31,595			—		$	410		$	1,744		$	33,749
	Total gains (losses) – realized/unrealized:
	Included in earnings		13,766			—			—			—			13,766
	Included in other comprehensive income		5,608			—			30			4			5,642
	Accretion included in earnings		657			—			—			3			660
	Purchases, issuances, sales and settlements:
	Purchases		—			—			—			—			—
	Issuances		—			—			—			—			—
	Sales/redemptions		(51,527	)		—			—			—			(51,527	)
	Settlements		(99	)		—			—			(217	)		(316	)
	Transfers from Level 3		—			—			—			—			—
	Transfers into Level 3		—			—			—			—			—
	Balance at end of period	$	—			—		$	440		$	1,534		$	1,974
	Year Ended December 31, 2013
	Balance at beginning of period	$	22,456		$	6,892		$	512		$	2,705		$	32,565
	Total gains (losses) – realized/unrealized:
	Included in earnings		—			78			—			—			78
	Included in other comprehensive income		6,701			21			18			(35	)		6,705
	Accretion included in earnings		3,160			4			—			12			3,176
	Purchases, issuances, sales and settlements:
	Purchases		—			—			—			—			—
	Issuances		38			—			—			—			38
	Sales/redemptions		—			(1,033	)		—			—			(1,033	)
	Settlements		(760	)		—			—			(938	)		(1,698	)
	Transfers from Level 3		—			(5,962	)		(120	)		—			(6,082	)
	Transfers into Level 3		—			—			—			—			—
	Balance at end of period	$	31,595		$	—		$	410		$	1,744		$	33,749
Additional Information about Assets Measured at Fair Value on Non-Recurring Basis	'
	For assets measured at fair value on a non-recurring basis still held at the balance sheet date, the following table provides the hierarchy level and the fair value of the related assets or portfolios:
		Level 1			Level 2			Level 3			Total
	September 30, 2014
	Impaired loans		—		$	10,724		$	1,393		$	12,117
	Other real estate owned		—			3,801			2,405			6,206
	December 31, 2013
	Impaired loans		—			3,235			59			3,294
	Other real estate owned		—			4,485			14,957			19,442
Fair Values of Corporation's Financial Instruments	'
	The fair values of the Corporation’s financial instruments are as follows:
								Fair Value Measurements
		Carrying			Fair			Level 1			Level 2			Level 3
		Amount			Value
	September 30, 2014
	Financial Assets
	Cash and cash equivalents	$	237,968		$	237,968		$	237,968		$	—		$	—
	Securities available for sale		1,439,735			1,439,735			203			1,437,558			1,974
	Securities held to maturity		1,475,552			1,480,229			—			1,475,584			4,645
	Net loans, including loans held for sale		10,851,690			10,709,224			—			—			10,709,224
	Bank owned life insurance		299,828			305,149			305,149			—			—
	Derivative assets		34,628			34,628			—			34,628			—
	Accrued interest receivable		39,609			39,609			39,609			—			—
	Financial Liabilities
	Deposits		11,452,093			11,455,085			8,772,509			2,682,576			—
	Short-term borrowings		1,601,167			1,601,167			1,601,167			—			—
	Long-term debt		483,189			484,900			—			—			484,900
	Junior subordinated debt		58,233			58,225			—			—			58,225
	Derivative liabilities		38,655			38,655			—			38,655			—
	Accrued interest payable		6,507			6,507			6,507			—			—
	December 31, 2013
	Financial Assets
	Cash and cash equivalents	$	213,981		$	213,981		$	213,981		$	—		$	—
	Securities available for sale		1,141,650			1,141,650			649			1,107,252			33,749
	Securities held to maturity		1,199,169			1,189,563			—			1,182,671			6,892
	Net loans, including loans held for sale		9,402,448			9,243,780			—			—			9,243,780
	Bank owned life insurance		289,402			292,694			292,694			—			—
	Derivative assets		33,317			33,317			—			33,317			—
	Accrued interest receivable		35,520			35,520			35,520			—			—
	Financial Liabilities
	Deposits		10,198,232			10,208,268			7,592,159			2,616,109			—
	Short-term borrowings		1,241,239			1,241,239			1,241,239			—			—
	Long-term debt		143,928			145,995			—			—			145,995
	Junior subordinated debt		75,205			70,442			—			—			70,442
	Derivative liabilities		43,369			43,369			—			43,369			—
	Accrued interest payable		7,061			7,061			7,061			—			—

Business_Additional_Informatio

Business - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2014
	Office
	Location
	State
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Number of states, Company operating financial services	6
Number of metropolitan areas, Company operating financial services	3
Number of consumer finance offices	71
Number of banking offices	289

Securities_Offerings_Additiona

Securities Offerings - Additional Information (Detail) (USD $)	0 Months Ended		9 Months Ended
In Thousands, except Share data, unless otherwise specified	Nov. 14, 2013	Nov. 01, 2013	Sep. 30, 2014	Sep. 30, 2013
Stockholders' Equity [Line Items]	'	'	'	'
Public offering, common stock	'	4,693,876	'	'
Common stock per share price	'	$12.25	'	'
Net proceeds from common stock offerings	$54,434	'	$7,795	$4,609
Net proceeds from preferred stock offerings	$106,882	'	'	'
Series E [Member]	'	'	'	'
Stockholders' Equity [Line Items]	'	'	'	'
Public offering, depositary shares	'	4,000,000	'	'
Depositary shares, price per share	'	$25	'	'
Common Stock Over-Allotment Option [Member]	'	'	'	'
Stockholders' Equity [Line Items]	'	'	'	'
Public offering, common stock	'	612,244	'	'
Preferred Stock Over-Allotment Option [Member]	'	'	'	'
Stockholders' Equity [Line Items]	'	'	'	'
Public offering, depositary shares	435,080	'	'	'

Mergers_and_Acquisitions_Addit

Mergers and Acquisitions - Additional Information (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 19, 2014	Feb. 15, 2014	Apr. 06, 2013	Oct. 12, 2013
In Thousands, except Share data, unless otherwise specified			OBA Financial Services, Inc. (OBA) [Member]	BCSB Bancorp, Inc. (BCSB) [Member]	Annapolis Bancorp, Inc. [Member]	PVF Capital Corp (PVF) [Member]
Business Acquisition [Line Items]	'	'	'	'	'	'
Assets acquired as a result of merger	'	'	$393,597	$595,263	$430,475	$737,813
Loans acquired as a result of merger	'	'	300,467	304,932	256,212	512,795
Deposits acquired as a result of merger	'	'	295,922	532,197	349,370	628,019
Value of acquisition	'	'	85,567	80,544	56,300	109,856
Common shares issued	'	'	7,170,037	6,730,597	4,641,412	8,893,598
Common shares acquired	'	'	4,025,895	3,235,961	4,060,802	26,119,398
Goodwill recorded as a result of merger	829,271	764,248	18,238	43,758	35,854	55,867
Core deposit intangibles recorded as result of the acquisition	'	'	4,347	6,591	3,775	6,867
Contingent cash payment due to collection of loan	'	'	'	'	$609	'
Contingent cash payment due to collection of loan, per share	'	'	'	'	$0.15	'
Warrants converted to purchase common stock	'	'	'	'	342,564	'
Warrant expiration date	'	'	'	'	30-Jan-19	'
Warrant exercise price	'	'	'	'	$3.57	'

Securities_Schedule_of_Amortiz

Securities - Schedule of Amortized Cost and Fair Value of Securities Available for Sale (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'	'
Securities Available For Sale, Amortized Cost	$1,449,263	$1,169,482
Securities Available For Sale, Gross Unrealized Gains	6,907	11,463
Securities Available For Sale, Gross Unrealized Losses	-16,435	-39,295
Securities Available For Sale, Fair Value	1,438,415	1,139,524
Securities Available For Sale, Fair Value	1,320	2,126
Assets measured at fair value, Available for sale securities	1,439,735	1,141,650
U.S. Treasury [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Securities Available For Sale, Amortized Cost	29,570	'
Securities Available For Sale, Gross Unrealized Gains	'	'
Securities Available For Sale, Gross Unrealized Losses	-36	'
Securities Available For Sale, Fair Value	29,534	'
U.S. Government-Sponsored Entities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Securities Available For Sale, Amortized Cost	278,330	336,763
Securities Available For Sale, Gross Unrealized Gains	162	126
Securities Available For Sale, Gross Unrealized Losses	-2,984	-5,904
Securities Available For Sale, Fair Value	275,508	330,985
Agency Mortgage-Backed Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Securities Available For Sale, Amortized Cost	492,456	247,880
Securities Available For Sale, Gross Unrealized Gains	4,798	4,304
Securities Available For Sale, Gross Unrealized Losses	-771	-1,303
Securities Available For Sale, Fair Value	496,483	250,881
Assets measured at fair value, Available for sale securities	496,483	'
Agency Collateralized Mortgage Obligations [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Securities Available For Sale, Amortized Cost	608,284	511,098
Securities Available For Sale, Gross Unrealized Gains	645	895
Securities Available For Sale, Gross Unrealized Losses	-11,995	-20,794
Securities Available For Sale, Fair Value	596,934	491,199
Assets measured at fair value, Available for sale securities	596,934	'
Non-Agency Collateralized Mortgage Obligations [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Securities Available For Sale, Amortized Cost	1,530	1,747
Securities Available For Sale, Gross Unrealized Gains	17	15
Securities Available For Sale, Gross Unrealized Losses	'	'
Securities Available For Sale, Fair Value	1,547	1,762
Assets measured at fair value, Available for sale securities	1,547	'
Commercial Mortgage-Backed Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Securities Available For Sale, Amortized Cost	8,062	'
Securities Available For Sale, Gross Unrealized Gains	'	'
Securities Available For Sale, Gross Unrealized Losses	-25	'
Securities Available For Sale, Fair Value	8,037	'
Assets measured at fair value, Available for sale securities	8,037	'
States of the U.S. and Political Subdivisions [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Securities Available For Sale, Amortized Cost	13,413	16,842
Securities Available For Sale, Gross Unrealized Gains	523	410
Securities Available For Sale, Gross Unrealized Losses	-42	-250
Securities Available For Sale, Fair Value	13,894	17,002
Collateralized Debt Obligations [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Securities Available For Sale, Amortized Cost	'	37,203
Securities Available For Sale, Gross Unrealized Gains	'	4,507
Securities Available For Sale, Gross Unrealized Losses	'	-10,115
Securities Available For Sale, Fair Value	'	31,595
Other Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Securities Available For Sale, Amortized Cost	16,587	16,505
Securities Available For Sale, Gross Unrealized Gains	473	524
Securities Available For Sale, Gross Unrealized Losses	-582	-929
Securities Available For Sale, Fair Value	16,478	16,100
Debt securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Securities Available For Sale, Amortized Cost	1,448,232	1,168,038
Securities Available For Sale, Gross Unrealized Gains	6,618	10,781
Securities Available For Sale, Gross Unrealized Losses	-16,435	-39,295
Securities Available For Sale, Fair Value	1,438,415	1,139,524
Equity Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Securities Available For Sale, Amortized Cost	1,031	1,444
Securities Available For Sale, Gross Unrealized Gains	289	682
Securities Available For Sale, Gross Unrealized Losses	'	'
Securities Available For Sale, Fair Value	1,320	2,126
Assets measured at fair value, Available for sale securities	$1,320	'

Securities_Schedule_of_Amortiz1

Securities - Schedule of Amortized Cost and Fair Value of Securities Held to Maturity (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Investment Securities Held To Maturity [Line Items]	'	'
Securities Held To Maturity, Amortized Cost	$1,475,552	$1,199,169
Securities Held To Maturity, Gross Unrealized Gains	18,384	15,484
Securities Held To Maturity, Gross Unrealized Losses	-13,707	-25,090
Securities held to maturity, fair value	1,480,229	1,189,563
U.S. Treasury [Member]	'	'
Investment Securities Held To Maturity [Line Items]	'	'
Securities Held To Maturity, Amortized Cost	502	503
Securities Held To Maturity, Gross Unrealized Gains	141	99
Securities Held To Maturity, Gross Unrealized Losses	0	'
Securities held to maturity, fair value	643	602
U.S. Government-Sponsored Entities [Member]	'	'
Investment Securities Held To Maturity [Line Items]	'	'
Securities Held To Maturity, Amortized Cost	101,652	43,322
Securities Held To Maturity, Gross Unrealized Gains	496	180
Securities Held To Maturity, Gross Unrealized Losses	-937	-1,151
Securities held to maturity, fair value	101,211	42,351
Agency Mortgage-Backed Securities [Member]	'	'
Investment Securities Held To Maturity [Line Items]	'	'
Securities Held To Maturity, Amortized Cost	709,123	628,681
Securities Held To Maturity, Gross Unrealized Gains	13,428	12,281
Securities Held To Maturity, Gross Unrealized Losses	-1,792	-6,032
Securities held to maturity, fair value	720,759	634,930
Agency Collateralized Mortgage Obligations [Member]	'	'
Investment Securities Held To Maturity [Line Items]	'	'
Securities Held To Maturity, Amortized Cost	494,791	385,408
Securities Held To Maturity, Gross Unrealized Gains	1,061	764
Securities Held To Maturity, Gross Unrealized Losses	-10,784	-15,844
Securities held to maturity, fair value	485,068	370,328
Non-Agency Collateralized Mortgage Obligations [Member]	'	'
Investment Securities Held To Maturity [Line Items]	'	'
Securities Held To Maturity, Amortized Cost	4,630	6,852
Securities Held To Maturity, Gross Unrealized Gains	17	44
Securities Held To Maturity, Gross Unrealized Losses	-2	-4
Securities held to maturity, fair value	4,645	6,892
Commercial Mortgage-Backed Securities [Member]	'	'
Investment Securities Held To Maturity [Line Items]	'	'
Securities Held To Maturity, Amortized Cost	14,959	2,241
Securities Held To Maturity, Gross Unrealized Gains	122	124
Securities Held To Maturity, Gross Unrealized Losses	-99	-37
Securities held to maturity, fair value	14,982	2,328
States of the U.S. and Political Subdivisions [Member]	'	'
Investment Securities Held To Maturity [Line Items]	'	'
Securities Held To Maturity, Amortized Cost	149,895	132,162
Securities Held To Maturity, Gross Unrealized Gains	3,119	1,992
Securities Held To Maturity, Gross Unrealized Losses	-93	-2,022
Securities held to maturity, fair value	$152,921	$132,132

Securities_Gross_Gains_and_Gro

Securities - Gross Gains and Gross Losses Realized on Sales of Securities (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Investments, Debt and Equity Securities [Abstract]	'	'	'	'
Gross gains	$1,191	$5	$19,939	$1,120
Gross losses	-13	'	-8,524	-363
Total	$1,178	$5	$11,415	$757

Securities_Additional_Informat

Securities - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended					3 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2014	Mar. 31, 2014	Mar. 31, 2014
	Security		Security		Securities		State of Pennsylvania [Member]	Pooled TPS [Member]	Other Securities [Member]
Schedule Of Securities [Line Items]	'	'	'	'	'	'	'	'	'
Number of pooled issue securities	'	'	'	'	23	'	'	'	'
Net proceeds from sale of securities	'	'	$175,872	$21,919	'	'	'	$51,540	'
Net securities gains (loss)	1,178	5	11,415	757	'	'	'	13,766	-2,351
Securities pledged to secure public deposits, trust deposits and for other purposes, carrying value	1,114,235	'	1,114,235	'	'	909,548	'	'	'
Securities pledged as collateral for short-term borrowings, carrying value	890,323	'	890,323	'	'	860,279	'	'	'
Number of single-issuer securities	4	'	4	'	'	'	'	'	'
Estimated fair value of single-issue trust preferred securities	6,304	'	6,304	'	'	'	'	'	'
Amortized cost of single-issue trust preferred securities	6,885	'	6,885	'	'	'	'	'	'
Impairment losses on securities	'	'	0	0	'	'	'	'	'
Municipal bond portfolio, value	163,789	'	163,789	'	'	'	'	'	'
Percent of municipal bond portfolio rated A or better	99.00%	'	99.00%	'	'	'	'	'	'
Percent of municipal bond portfolio, general obligation bonds	99.50%	'	99.50%	'	'	'	'	'	'
Percent of municipal bonds	'	'	'	'	'	'	86.80%	'	'
Average holding size of municipal bond	$1,092	'	$1,092	'	'	'	'	'	'
Percent of portfolio with credit support	88.00%	'	88.00%	'	'	'	'	'	'

Securities_Amortized_Cost_and_

Securities - Amortized Cost and Fair Value of Securities, by Contractual Maturities (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule Of Securities [Line Items]	'	'
Available for Sale, Due in one year or less, Amortized Cost	'	'
Available for Sale, Due from one to five years, Amortized Cost	283,913	'
Available for Sale, Due from five to ten years, Amortized Cost	47,102	'
Available for Sale, Due after ten years, Amortized Cost	6,885	'
Available for Sale, with contractual maturities, Amortized Cost	337,900	'
Total securities available for sale, Amortized Cost	1,449,263	1,169,482
Available for Sale, Due in one year or less, Fair Value	'	'
Available for Sale, Due from one to five years, Fair Value	282,767	'
Available for Sale, Due from five to ten years, Fair Value	46,344	'
Available for Sale, Due after ten years, Fair Value	6,303	'
Available for Sale, with contractual maturities, Fair Value	335,414	'
Total available for sale Securities, Fair Value	1,439,735	1,141,650
Held to Maturity, Due in one year or less, Amortized Cost	3,711	'
Held to Maturity, Due from one to five years, Amortized Cost	90,393	'
Held to Maturity, Due from five to ten years, Amortized Cost	79,109	'
Held to Maturity, Due after ten years, Amortized Cost	78,836	'
Securities Held To Maturity, with contractual maturities, Amortized Cost	252,049	'
Held to Maturity, with contractual maturities, Amortized Cost	1,475,552	1,199,169
Held to Maturity, Due in one year or less, Fair Value	3,741	'
Held to Maturity, Due from one to five years, Fair Value	89,667	'
Held to Maturity, Due from five to ten years, Fair Value	80,905	'
Held to Maturity, Due after ten years, Fair Value	80,462	'
Securities Held To Maturity, with contractual maturities, Fair Value	254,775	'
Held to Maturity, with contractual maturities, Fair Value	1,480,229	1,189,563
Agency Mortgage-Backed Securities [Member]	'	'
Schedule Of Securities [Line Items]	'	'
Total securities available for sale, Amortized Cost	492,456	247,880
Total available for sale Securities, Fair Value	496,483	'
Held to Maturity, with contractual maturities, Amortized Cost	709,123	628,681
Held to Maturity, with contractual maturities, Fair Value	720,759	634,930
Agency Collateralized Mortgage Obligations [Member]	'	'
Schedule Of Securities [Line Items]	'	'
Total securities available for sale, Amortized Cost	608,284	511,098
Total available for sale Securities, Fair Value	596,934	'
Held to Maturity, with contractual maturities, Amortized Cost	494,791	385,408
Held to Maturity, with contractual maturities, Fair Value	485,068	370,328
Non-Agency Collateralized Mortgage Obligations [Member]	'	'
Schedule Of Securities [Line Items]	'	'
Total securities available for sale, Amortized Cost	1,530	1,747
Total available for sale Securities, Fair Value	1,547	'
Held to Maturity, with contractual maturities, Amortized Cost	4,630	6,852
Held to Maturity, with contractual maturities, Fair Value	4,645	6,892
Commercial Mortgage-Backed Securities [Member]	'	'
Schedule Of Securities [Line Items]	'	'
Total securities available for sale, Amortized Cost	8,062	'
Total available for sale Securities, Fair Value	8,037	'
Held to Maturity, with contractual maturities, Amortized Cost	14,959	2,241
Held to Maturity, with contractual maturities, Fair Value	14,982	2,328
Equity Securities [Member]	'	'
Schedule Of Securities [Line Items]	'	'
Total securities available for sale, Amortized Cost	1,031	1,444
Total available for sale Securities, Fair Value	1,320	'
Held to Maturity, with contractual maturities, Amortized Cost	'	'
Held to Maturity, with contractual maturities, Fair Value	'	'

Securities_Summaries_of_Fair_V

Securities - Summaries of Fair Values and Unrealized Losses of Securities, Segregated by Length of Impairment (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Security	Security
Schedule Of Securities [Line Items]	'	'
Number of available for sale securities, Less than 1 year	37	54
Number of available for sale securities, Greater than 1 year	29	14
Number of available for sale securities	66	68
Securities Available For Sale, Less than 12 Months, Fair Value	$629,008	$734,257
Securities Available For Sale, Less than 12 Months, Unrealized Losses	-3,316	-26,101
Securities Available For Sale, 12 Months or More, Fair Value	353,541	48,144
Securities Available For Sale, 12 Months or More, Unrealized Losses	-13,119	-13,194
Securities Available For Sale, Fair Value, Total	982,549	782,401
Securities Available For Sale, Unrealized Losses, Total	-16,435	-39,295
Number of held to maturity securities	59	80
Securities Held To Maturity, Less than 12 Months, Fair Value	331,130	669,220
Securities Held To Maturity, Less than 12 Months, Unrealized Losses	-1,932	-24,379
Securities Held To Maturity, Greater than 12 Months, Fair Value	345,909	15,674
Securities Held To Maturity, Greater than 12 Months, Unrealized Losses	-11,775	-711
Securities Held To Maturity, Fair Value, Total	677,039	684,894
Securities Held To Maturity, Unrealized Losses, Total	-13,707	-25,090
Less than 12 Months [Member]	'	'
Schedule Of Securities [Line Items]	'	'
Number of held to maturity securities	27	78
Greater than 12 Months [Member]	'	'
Schedule Of Securities [Line Items]	'	'
Number of held to maturity securities	32	2
U.S. Treasury [Member]	'	'
Schedule Of Securities [Line Items]	'	'
Number of available for sale securities, Less than 1 year	3	'
Number of available for sale securities, Greater than 1 year	0	'
Number of available for sale securities	3	'
Securities Available For Sale, Less than 12 Months, Fair Value	29,534	'
Securities Available For Sale, Less than 12 Months, Unrealized Losses	-36	'
Securities Available For Sale, 12 Months or More, Fair Value	'	'
Securities Available For Sale, 12 Months or More, Unrealized Losses	'	'
Securities Available For Sale, Fair Value, Total	29,534	'
Securities Available For Sale, Unrealized Losses, Total	-36	'
Securities Held To Maturity, Unrealized Losses, Total	0	'
U.S. Government-Sponsored Entities [Member]	'	'
Schedule Of Securities [Line Items]	'	'
Number of available for sale securities, Less than 1 year	9	17
Number of available for sale securities, Greater than 1 year	8	'
Number of available for sale securities	17	17
Securities Available For Sale, Less than 12 Months, Fair Value	102,319	232,962
Securities Available For Sale, Less than 12 Months, Unrealized Losses	-259	-5,904
Securities Available For Sale, 12 Months or More, Fair Value	113,264	'
Securities Available For Sale, 12 Months or More, Unrealized Losses	-2,725	'
Securities Available For Sale, Fair Value, Total	215,583	232,962
Securities Available For Sale, Unrealized Losses, Total	-2,984	-5,904
Number of held to maturity securities	6	3
Securities Held To Maturity, Less than 12 Months, Fair Value	39,956	24,513
Securities Held To Maturity, Less than 12 Months, Unrealized Losses	-151	-530
Securities Held To Maturity, Greater than 12 Months, Fair Value	39,247	14,378
Securities Held To Maturity, Greater than 12 Months, Unrealized Losses	-786	-621
Securities Held To Maturity, Fair Value, Total	79,203	38,891
Securities Held To Maturity, Unrealized Losses, Total	-937	-1,151
U.S. Government-Sponsored Entities [Member] | Less than 12 Months [Member]	'	'
Schedule Of Securities [Line Items]	'	'
Number of held to maturity securities	3	2
U.S. Government-Sponsored Entities [Member] | Greater than 12 Months [Member]	'	'
Schedule Of Securities [Line Items]	'	'
Number of held to maturity securities	3	1
Agency Mortgage-Backed Securities [Member]	'	'
Schedule Of Securities [Line Items]	'	'
Number of available for sale securities, Less than 1 year	10	9
Number of available for sale securities, Greater than 1 year	0	'
Number of available for sale securities	10	9
Securities Available For Sale, Less than 12 Months, Fair Value	196,423	108,284
Securities Available For Sale, Less than 12 Months, Unrealized Losses	-771	-1,303
Securities Available For Sale, 12 Months or More, Fair Value	'	'
Securities Available For Sale, 12 Months or More, Unrealized Losses	'	'
Securities Available For Sale, Fair Value, Total	196,423	108,284
Securities Available For Sale, Unrealized Losses, Total	-771	-1,303
Number of held to maturity securities	20	25
Securities Held To Maturity, Less than 12 Months, Fair Value	149,058	308,864
Securities Held To Maturity, Less than 12 Months, Unrealized Losses	-631	-5,942
Securities Held To Maturity, Greater than 12 Months, Fair Value	83,697	1,296
Securities Held To Maturity, Greater than 12 Months, Unrealized Losses	-1,161	-90
Securities Held To Maturity, Fair Value, Total	232,755	310,160
Securities Held To Maturity, Unrealized Losses, Total	-1,792	-6,032
Agency Mortgage-Backed Securities [Member] | Less than 12 Months [Member]	'	'
Schedule Of Securities [Line Items]	'	'
Number of held to maturity securities	12	24
Agency Mortgage-Backed Securities [Member] | Greater than 12 Months [Member]	'	'
Schedule Of Securities [Line Items]	'	'
Number of held to maturity securities	8	1
Agency Collateralized Mortgage Obligations [Member]	'	'
Schedule Of Securities [Line Items]	'	'
Number of available for sale securities, Less than 1 year	14	26
Number of available for sale securities, Greater than 1 year	16	2
Number of available for sale securities	30	28
Securities Available For Sale, Less than 12 Months, Fair Value	292,696	389,989
Securities Available For Sale, Less than 12 Months, Unrealized Losses	-2,225	-18,644
Securities Available For Sale, 12 Months or More, Fair Value	232,824	34,229
Securities Available For Sale, 12 Months or More, Unrealized Losses	-9,770	-2,150
Securities Available For Sale, Fair Value, Total	525,520	424,218
Securities Available For Sale, Unrealized Losses, Total	-11,995	-20,794
Number of held to maturity securities	24	21
Securities Held To Maturity, Less than 12 Months, Fair Value	125,974	301,312
Securities Held To Maturity, Less than 12 Months, Unrealized Losses	-1,036	-15,844
Securities Held To Maturity, Greater than 12 Months, Fair Value	216,359	'
Securities Held To Maturity, Greater than 12 Months, Unrealized Losses	-9,748	'
Securities Held To Maturity, Fair Value, Total	342,333	301,312
Securities Held To Maturity, Unrealized Losses, Total	-10,784	-15,844
Agency Collateralized Mortgage Obligations [Member] | Less than 12 Months [Member]	'	'
Schedule Of Securities [Line Items]	'	'
Number of held to maturity securities	8	21
Agency Collateralized Mortgage Obligations [Member] | Greater than 12 Months [Member]	'	'
Schedule Of Securities [Line Items]	'	'
Number of held to maturity securities	16	'
Commercial Mortgage-Backed Securities [Member]	'	'
Schedule Of Securities [Line Items]	'	'
Number of available for sale securities, Less than 1 year	1	'
Number of available for sale securities, Greater than 1 year	'	'
Number of available for sale securities	1	'
Securities Available For Sale, Less than 12 Months, Fair Value	8,036	'
Securities Available For Sale, Less than 12 Months, Unrealized Losses	-25	'
Securities Available For Sale, 12 Months or More, Fair Value	'	'
Securities Available For Sale, 12 Months or More, Unrealized Losses	0	'
Securities Available For Sale, Fair Value, Total	8,036	'
Securities Available For Sale, Unrealized Losses, Total	-25	'
Number of held to maturity securities	2	1
Securities Held To Maturity, Less than 12 Months, Fair Value	13,655	984
Securities Held To Maturity, Less than 12 Months, Unrealized Losses	-99	-37
Securities Held To Maturity, Greater than 12 Months, Fair Value	'	'
Securities Held To Maturity, Greater than 12 Months, Unrealized Losses	'	'
Securities Held To Maturity, Fair Value, Total	13,655	984
Securities Held To Maturity, Unrealized Losses, Total	-99	-37
Commercial Mortgage-Backed Securities [Member] | Less than 12 Months [Member]	'	'
Schedule Of Securities [Line Items]	'	'
Number of held to maturity securities	2	1
Commercial Mortgage-Backed Securities [Member] | Greater than 12 Months [Member]	'	'
Schedule Of Securities [Line Items]	'	'
Number of held to maturity securities	'	'
States of the U.S. and Political Subdivisions [Member]	'	'
Schedule Of Securities [Line Items]	'	'
Number of available for sale securities, Less than 1 year	'	2
Number of available for sale securities, Greater than 1 year	1	'
Number of available for sale securities	1	2
Securities Available For Sale, Less than 12 Months, Fair Value	'	3,022
Securities Available For Sale, Less than 12 Months, Unrealized Losses	'	-250
Securities Available For Sale, 12 Months or More, Fair Value	1,149	'
Securities Available For Sale, 12 Months or More, Unrealized Losses	-42	'
Securities Available For Sale, Fair Value, Total	1,149	3,022
Securities Available For Sale, Unrealized Losses, Total	-42	-250
Number of held to maturity securities	6	27
Securities Held To Maturity, Less than 12 Months, Fair Value	1,726	31,537
Securities Held To Maturity, Less than 12 Months, Unrealized Losses	-13	-2,022
Securities Held To Maturity, Greater than 12 Months, Fair Value	6,606	'
Securities Held To Maturity, Greater than 12 Months, Unrealized Losses	-80	'
Securities Held To Maturity, Fair Value, Total	8,332	31,537
Securities Held To Maturity, Unrealized Losses, Total	-93	-2,022
States of the U.S. and Political Subdivisions [Member] | Less than 12 Months [Member]	'	'
Schedule Of Securities [Line Items]	'	'
Number of held to maturity securities	1	27
States of the U.S. and Political Subdivisions [Member] | Greater than 12 Months [Member]	'	'
Schedule Of Securities [Line Items]	'	'
Number of held to maturity securities	5	'
Other Securities [Member]	'	'
Schedule Of Securities [Line Items]	'	'
Number of available for sale securities, Less than 1 year	0	'
Number of available for sale securities, Greater than 1 year	4	4
Number of available for sale securities	4	4
Securities Available For Sale, Less than 12 Months, Fair Value	'	'
Securities Available For Sale, Less than 12 Months, Unrealized Losses	'	'
Securities Available For Sale, 12 Months or More, Fair Value	6,304	5,950
Securities Available For Sale, 12 Months or More, Unrealized Losses	-582	-929
Securities Available For Sale, Fair Value, Total	6,304	5,950
Securities Available For Sale, Unrealized Losses, Total	-582	-929
Collateralized Debt Obligations [Member]	'	'
Schedule Of Securities [Line Items]	'	'
Number of available for sale securities, Less than 1 year	'	'
Number of available for sale securities, Greater than 1 year	'	8
Number of available for sale securities	'	8
Securities Available For Sale, Less than 12 Months, Fair Value	'	'
Securities Available For Sale, Less than 12 Months, Unrealized Losses	'	'
Securities Available For Sale, 12 Months or More, Fair Value	'	7,965
Securities Available For Sale, 12 Months or More, Unrealized Losses	'	-10,115
Securities Available For Sale, Fair Value, Total	'	7,965
Securities Available For Sale, Unrealized Losses, Total	'	-10,115
Non-Agency Collateralized Mortgage Obligations [Member]	'	'
Schedule Of Securities [Line Items]	'	'
Number of held to maturity securities	1	3
Securities Held To Maturity, Less than 12 Months, Fair Value	761	2,010
Securities Held To Maturity, Less than 12 Months, Unrealized Losses	-2	-4
Securities Held To Maturity, Greater than 12 Months, Fair Value	'	'
Securities Held To Maturity, Greater than 12 Months, Unrealized Losses	'	'
Securities Held To Maturity, Fair Value, Total	761	2,010
Securities Held To Maturity, Unrealized Losses, Total	($2)	($4)
Non-Agency Collateralized Mortgage Obligations [Member] | Less than 12 Months [Member]	'	'
Schedule Of Securities [Line Items]	'	'
Number of held to maturity securities	1	3
Non-Agency Collateralized Mortgage Obligations [Member] | Greater than 12 Months [Member]	'	'
Schedule Of Securities [Line Items]	'	'
Number of held to maturity securities	'	'

Securities_Summary_of_Cumulati

Securities - Summary of Cumulative Credit-Related OTTI Charges (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]	'	'
Beginning balance	$17,182	$17,367
Loss where impairment was not previously recognized	'	0
Additional loss where impairment was previously recognized	'	0
Reduction due to credit impaired securities sold	-17,155	-212
Ending balance	27	17,155
Collateralized Debt Obligations [Member]	'	'
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]	'	'
Beginning balance	17,155	17,155
Loss where impairment was not previously recognized	'	'
Additional loss where impairment was previously recognized	'	0
Reduction due to credit impaired securities sold	-17,155	0
Ending balance	'	17,155
Residential Non-Agency Collateralized Mortgage Obligations [Member]	'	'
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]	'	'
Beginning balance	'	212
Loss where impairment was not previously recognized	'	'
Additional loss where impairment was previously recognized	'	'
Reduction due to credit impaired securities sold	'	-212
Ending balance	'	'
Equity Securities [Member]	'	'
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]	'	'
Beginning balance	27	'
Loss where impairment was not previously recognized	'	'
Additional loss where impairment was previously recognized	'	'
Reduction due to credit impaired securities sold	'	'
Ending balance	$27	'

Federal_Home_Loan_Bank_Stock_A

Federal Home Loan Bank Stock - Additional Information (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Statement of Financial Position [Abstract]	'	'
Federal Home Loan Bank stock	$58,372	$23,636

Loans_and_Allowance_for_Loan_L2

Loans and Allowance for Loan Losses - Summary of Loans, Net of Unearned Income (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	$10,967,860	$9,506,094
Commercial Real Estate [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	3,790,164	3,245,209
Commercial and Industrial [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	2,247,605	1,881,474
Commercial Leases [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	171,615	158,895
Total Commercial Loans and Leases [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	6,209,384	5,285,578
Direct Installment [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	1,579,312	1,467,236
Residential Mortgages [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	1,231,796	1,086,739
Indirect Installment [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	805,836	655,587
Consumer Lines of Credit [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	1,087,271	965,771
Other [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	54,261	45,183
Originated Loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	9,250,628	8,154,765
Originated Loans [Member] | Commercial Real Estate [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	2,930,146	2,640,428
Originated Loans [Member] | Commercial and Industrial [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	2,104,559	1,761,668
Originated Loans [Member] | Commercial Leases [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	171,615	158,895
Originated Loans [Member] | Total Commercial Loans and Leases [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	5,206,320	4,560,991
Originated Loans [Member] | Direct Installment [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	1,509,096	1,387,995
Originated Loans [Member] | Residential Mortgages [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	762,743	678,227
Originated Loans [Member] | Indirect Installment [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	803,201	649,701
Originated Loans [Member] | Consumer Lines of Credit [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	915,007	832,668
Originated Loans [Member] | Other [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	54,261	45,183
Acquired Loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	1,717,232	1,351,329
Acquired Loans [Member] | Commercial Real Estate [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	860,018	604,781
Acquired Loans [Member] | Commercial and Industrial [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	143,046	119,806
Acquired Loans [Member] | Commercial Leases [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	'	0
Acquired Loans [Member] | Total Commercial Loans and Leases [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	1,003,064	724,587
Acquired Loans [Member] | Direct Installment [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	70,216	79,241
Acquired Loans [Member] | Residential Mortgages [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	469,053	408,512
Acquired Loans [Member] | Indirect Installment [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	2,635	5,886
Acquired Loans [Member] | Consumer Lines of Credit [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	172,264	133,103
Acquired Loans [Member] | Other [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	'	$0

Loans_and_Allowance_for_Loan_L3

Loans and Allowance for Loan Losses - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans, net of unearned income	$10,967,860	'	$10,967,860	'	$9,506,094
Outstanding contractual balance receivable of acquired loans	1,805,350	'	1,805,350	'	1,449,227
Commercial construction loans	299,859	'	299,859	'	252,842
Amounts received on loans in excess of expected cash flows	'	'	1,790	'	440
Sustained period of delinquency for impairment evaluation	'90 days	'90 days	'90 days	'90 days	'
Minimum corporation reserves for commercial loan	500	'	500	'	'
Minimum amount to allocate specific valuation allowance	500	'	500	'	'
Recorded Investment	12,538	'	12,538	'	'
Allowance for loan losses	'	'	6,032	'	5,900
Restructured loans returned to performing status	'	'	2,862	'	'
Valuation for impairment of loans with pooled reserves	500	'	500	'	500
Pooled reserves for all other classes of loans	'	'	1,098	'	1,005
Commercial Real Estate [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans, net of unearned income	3,790,164	'	3,790,164	'	3,245,209
Recorded Investment	35,289	'	35,289	'	44,075
Allowance for loan losses	'	'	3,025	'	3,093
Consumer Lines of Credit [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans, net of unearned income	1,087,271	'	1,087,271	'	965,771
Consumer loans	175,460	'	175,460	'	179,970
Percentage of loan portfolio	1.60%	'	1.60%	'	1.90%
Recorded Investment	1,783	'	1,783	'	597
Commercial Construction Loans [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Percentage of loan portfolio	2.70%	'	2.70%	'	2.70%
Commercial and Industrial [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans, net of unearned income	2,247,605	'	2,247,605	'	1,881,474
Recorded Investment	9,460	'	9,460	'	7,423
Allowance for loan losses	'	'	644	'	786
Direct Installment [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans, net of unearned income	1,579,312	'	1,579,312	'	1,467,236
Recorded Investment	13,820	'	13,820	'	10,577
Allowance for loan losses	'	'	1,530	'	727
Residential Mortgages [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans, net of unearned income	1,231,796	'	1,231,796	'	1,086,739
Recorded Investment	15,467	'	15,467	'	14,012
Allowance for loan losses	'	'	326	'	970
Indirect Installment [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans, net of unearned income	805,836	'	805,836	'	655,587
Recorded Investment	1,339	'	1,339	'	1,202
Allowance for loan losses	'	'	243	'	324
Consumer Lines Of Credit [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Allowance for loan losses	'	'	264	'	'
Acquired Loans [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans, net of unearned income	1,711,200	'	1,711,200	'	1,345,429
Purchased Credit-Impaired Loans [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Carrying Amount	7,512	'	7,512	'	21,192
Outstanding contractual receivable of PCI loan	22,172	'	22,172	'	56,500
Recorded Investment	8,276	'	8,276	'	22,192
Owner-Occupied [Member] | Commercial Real Estate [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Percentage of loan portfolio	41.20%	'	41.20%	'	43.10%
Non-Owner-Occupied [Member] | Commercial Real Estate [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Percentage of loan portfolio	58.80%	'	58.80%	'	56.90%
Specific reserves for commercial TDRs [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Reserves in allowance for loan losses, TDRs	400	'	400	'	561
Pooled reserves for commercial TDRs [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Reserves in allowance for loan losses, TDRs	$1,047	'	$1,047	'	$193
Commercial Loans [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Threshold period past due for default non-accrual status of trade accounts receivable	'	'	'90 days	'	'
Installment Loans [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Threshold period past due for default non-accrual status of trade accounts receivable	'	'	'120 days	'	'
Residential Mortgages [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Threshold period past due for default non-accrual status of trade accounts receivable	'	'	'180 days	'	'

Loans_and_Allowance_for_Loan_L4

Loans and Allowance for Loan Losses - Carrying Amounts at Acquisition of All Purchased Loans (Impaired and Non-Impaired) Acquired (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]	'	'	'
Accretable yield	($291,881)	($305,646)	($254,153)
Acquired Loans [Member] | BCSB Bancorp, Inc. (BCSB) [Member]	'	'	'
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]	'	'	'
Contractually required cash flows at acquisition	360,713	'	'
Non-accretable difference (expected losses and foregone interest)	-23,146	'	'
Cash flows expected to be collected at acquisition	337,567	'	'
Accretable yield	-71,111	'	'
Basis in acquired loans at acquisition	266,456	'	'
Acquired Loans [Member] | BCSB Bancorp, Inc. (BCSB) [Member] | Impaired Loans [Member]	'	'	'
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]	'	'	'
Contractually required cash flows at acquisition	10,470	'	'
Non-accretable difference (expected losses and foregone interest)	-5,426	'	'
Cash flows expected to be collected at acquisition	5,044	'	'
Accretable yield	-704	'	'
Basis in acquired loans at acquisition	4,340	'	'
Acquired Loans [Member] | BCSB Bancorp, Inc. (BCSB) [Member] | Performing Loans [Member]	'	'	'
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]	'	'	'
Contractually required cash flows at acquisition	350,243	'	'
Non-accretable difference (expected losses and foregone interest)	-17,720	'	'
Cash flows expected to be collected at acquisition	332,523	'	'
Accretable yield	-70,407	'	'
Basis in acquired loans at acquisition	262,116	'	'
Acquired Loans [Member] | Annapolis Bancorp Inc. And PVF Capital Corp. [Member]	'	'	'
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]	'	'	'
Contractually required cash flows at acquisition	'	837,086	'
Non-accretable difference (expected losses and foregone interest)	'	-76,199	'
Cash flows expected to be collected at acquisition	'	760,887	'
Accretable yield	'	-115,352	'
Basis in acquired loans at acquisition	'	645,535	'
Acquired Loans [Member] | Annapolis Bancorp Inc. And PVF Capital Corp. [Member] | Impaired Loans [Member]	'	'	'
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]	'	'	'
Contractually required cash flows at acquisition	'	40,972	'
Non-accretable difference (expected losses and foregone interest)	'	-23,207	'
Cash flows expected to be collected at acquisition	'	17,765	'
Accretable yield	'	-2,505	'
Basis in acquired loans at acquisition	'	15,260	'
Acquired Loans [Member] | Annapolis Bancorp Inc. And PVF Capital Corp. [Member] | Performing Loans [Member]	'	'	'
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]	'	'	'
Contractually required cash flows at acquisition	'	796,114	'
Non-accretable difference (expected losses and foregone interest)	'	-52,992	'
Cash flows expected to be collected at acquisition	'	743,122	'
Accretable yield	'	-112,847	'
Basis in acquired loans at acquisition	'	$630,275	'

Loans_and_Allowance_for_Loan_L5

Loans and Allowance for Loan Losses - Summary of Change in Accretable Yield of Acquired Loans (Detail) (USD $)	9 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]	'	'
Balance at beginning of period	$305,646	$254,153
Acquisitions	71,111	115,352
Reduction due to unexpected early payoffs	-34,747	-42,582
Reclass from non-accretable difference	9,925	16,393
Disposals/transfers	-5,390	-592
Accretion	-54,664	-37,078
Balance at end of period	291,881	305,646
Acquired Impaired Loans [Member]	'	'
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]	'	'
Balance at beginning of period	7,456	778
Acquisitions	704	2,505
Reduction due to unexpected early payoffs	'	'
Reclass from non-accretable difference	2,612	8,097
Disposals/transfers	-2,938	-368
Accretion	-4,530	-3,556
Balance at end of period	3,304	7,456
Acquired Performing Loans [Member]	'	'
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]	'	'
Balance at beginning of period	298,190	253,375
Acquisitions	70,407	112,847
Reduction due to unexpected early payoffs	-34,747	-42,582
Reclass from non-accretable difference	7,313	8,296
Disposals/transfers	-2,452	-224
Accretion	-50,134	-33,522
Balance at end of period	$288,577	$298,190

Loans_and_Allowance_for_Loan_L6

Loans and Allowance for Loan Losses - Summary of Purchased Credit-Impaired Loans, Information Identified in Corporation's Acquisition of BCSB (Detail) (BCSB Bancorp, Inc. (BCSB) [Member], USD $)	Sep. 30, 2014	Feb. 15, 2014
In Thousands, unless otherwise specified
BCSB Bancorp, Inc. (BCSB) [Member]	'	'
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]	'	'
Outstanding balance	'	$10,470
Carrying amount	'	4,340
Allowance for loan losses	'	'
Impairment recognized since acquisition	275	'
Allowance reduction recognized since acquisition	$275	'

Loans_and_Allowance_for_Loan_L7

Loans and Allowance for Loan Losses - Summary of Information about Corporation's Purchased Credit-Impaired Loans (Detail) (USD $)	9 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Balance at beginning of period	$305,646	$254,153
Acquisitions	71,111	115,352
Accretion	54,664	37,078
Reclass from non-accretable difference	9,925	16,393
Disposals/transfers	-5,390	-592
Balance at end of period	291,881	305,646
Recorded Investment [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Balance at beginning of period	22,192	16,623
Acquisitions	4,340	15,260
Accretion	4,530	3,556
Payments received	-19,123	-9,325
Reclass from non-accretable difference	'	0
Disposals/transfers	-3,663	-3,922
Contractual interest	'	0
Balance at end of period	8,276	22,192
Accretable Yield [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Balance at beginning of period	-7,456	-778
Acquisitions	-704	-2,505
Accretion	4,530	3,556
Payments received	'	0
Reclass from non-accretable difference	-2,612	-8,097
Disposals/transfers	2,938	368
Contractual interest	'	0
Balance at end of period	-3,304	-7,456
Expected Cash Flows [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Balance at beginning of period	29,648	17,401
Acquisitions	5,044	17,765
Accretion	'	0
Payments received	-19,123	-9,325
Reclass from non-accretable difference	2,612	8,097
Disposals/transfers	-6,601	-4,290
Contractual interest	'	0
Balance at end of period	11,580	29,648
Non-Accretable Difference [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Balance at beginning of period	-26,852	-23,733
Acquisitions	-5,426	-24,266
Accretion	'	0
Payments received	1,877	1,345
Reclass from non-accretable difference	2,612	8,097
Disposals/transfers	19,299	14,405
Contractual interest	-2,102	-2,700
Balance at end of period	-10,592	-26,852
Outstanding Balance [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Balance at beginning of period	56,500	41,134
Acquisitions	10,470	42,031
Accretion	'	0
Payments received	-21,000	-10,670
Reclass from non-accretable difference	'	0
Disposals/transfers	-25,900	-18,695
Contractual interest	2,102	2,700
Balance at end of period	$22,172	$56,500

Loans_and_Allowance_for_Loan_L8

Loans and Allowance for Loan Losses - Summary of Non-Performing Assets (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Troubled debt restructurings	$41,373	$41,623
Non-Performing [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Non-accrual loans	55,095	58,755
Troubled debt restructurings	21,797	18,698
Total non-performing loans	76,892	77,453
Other real estate owned (OREO)	39,040	40,681
Total non-performing loans and OREO	115,932	118,134
Non-performing investments	'	797
Total non-performing assets	$115,932	$118,931
Non-performing loans as a percent of total loans	0.70%	0.81%
Non-performing loans + OREO as a percent of total loans + OREO	1.05%	1.24%
Non-performing assets as a percent of total assets	0.74%	0.88%

Loans_and_Allowance_for_Loan_L9

Loans and Allowance for Loan Losses - Age Analysis of Past Due Loans, by Class (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Total Loans	$10,967,860	$9,506,094
Commercial Real Estate [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Total Loans	3,790,164	3,245,209
Commercial and Industrial [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Total Loans	2,247,605	1,881,474
Commercial Leases [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Total Loans	171,615	158,895
Total Commercial Loans and Leases [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Total Loans	6,209,384	5,285,578
Direct Installment [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Total Loans	1,579,312	1,467,236
Residential Mortgages [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Total Loans	1,231,796	1,086,739
Indirect Installment [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Total Loans	805,836	655,587
Consumer Lines of Credit [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Total Loans	1,087,271	965,771
Other [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Total Loans	54,261	45,183
Originated Loans [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-89 Days Past Due	35,899	37,342
> 90 Days Past Due and Still Accruing	7,085	7,971
Non- Accrual	55,095	58,755
Total Past Due	98,079	104,068
Current	9,152,549	8,050,697
Total Loans	9,250,628	8,154,765
Originated Loans [Member] | Commercial Real Estate [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-89 Days Past Due	3,711	5,428
> 90 Days Past Due and Still Accruing	132	252
Non- Accrual	33,710	40,960
Total Past Due	37,553	46,640
Current	2,892,593	2,593,788
Total Loans	2,930,146	2,640,428
Originated Loans [Member] | Commercial and Industrial [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-89 Days Past Due	2,478	2,066
> 90 Days Past Due and Still Accruing	6	8
Non- Accrual	8,439	6,643
Total Past Due	10,923	8,717
Current	2,093,636	1,752,951
Total Loans	2,104,559	1,761,668
Originated Loans [Member] | Commercial Leases [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-89 Days Past Due	985	714
> 90 Days Past Due and Still Accruing	'	'
Non- Accrual	651	734
Total Past Due	1,636	1,448
Current	169,979	157,447
Total Loans	171,615	158,895
Originated Loans [Member] | Total Commercial Loans and Leases [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-89 Days Past Due	7,174	8,208
> 90 Days Past Due and Still Accruing	138	260
Non- Accrual	42,800	48,337
Total Past Due	50,112	56,805
Current	5,156,208	4,504,186
Total Loans	5,206,320	4,560,991
Originated Loans [Member] | Direct Installment [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-89 Days Past Due	11,102	9,038
> 90 Days Past Due and Still Accruing	3,498	3,753
Non- Accrual	6,761	4,686
Total Past Due	21,361	17,477
Current	1,487,735	1,370,518
Total Loans	1,509,096	1,387,995
Originated Loans [Member] | Residential Mortgages [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-89 Days Past Due	9,646	12,681
> 90 Days Past Due and Still Accruing	2,242	2,401
Non- Accrual	3,471	4,260
Total Past Due	15,359	19,342
Current	747,384	658,885
Total Loans	762,743	678,227
Originated Loans [Member] | Indirect Installment [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-89 Days Past Due	5,255	5,653
> 90 Days Past Due and Still Accruing	536	471
Non- Accrual	1,190	1,060
Total Past Due	6,981	7,184
Current	796,220	642,517
Total Loans	803,201	649,701
Originated Loans [Member] | Consumer Lines of Credit [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-89 Days Past Due	2,581	1,737
> 90 Days Past Due and Still Accruing	646	1,076
Non- Accrual	873	412
Total Past Due	4,100	3,225
Current	910,907	829,443
Total Loans	915,007	832,668
Originated Loans [Member] | Other [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-89 Days Past Due	141	25
> 90 Days Past Due and Still Accruing	25	10
Non- Accrual	'	'
Total Past Due	166	35
Current	54,095	45,148
Total Loans	54,261	45,183
Acquired Loans [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-89 Days Past Due	29,191	30,205
> 90 Days Past Due and Still Accruing	39,236	45,823
Non- Accrual	'	0
Total Past Due	68,427	76,028
Current	1,736,923	1,373,199
Discount	-88,118	-97,898
Total Loans	1,717,232	1,351,329
Acquired Loans [Member] | Commercial Real Estate [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-89 Days Past Due	14,415	13,637
> 90 Days Past Due and Still Accruing	14,019	20,668
Non- Accrual	'	0
Total Past Due	28,434	34,305
Current	866,319	619,197
Discount	-34,735	-48,721
Total Loans	860,018	604,781
Acquired Loans [Member] | Commercial and Industrial [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-89 Days Past Due	350	1,860
> 90 Days Past Due and Still Accruing	2,306	1,899
Non- Accrual	'	0
Total Past Due	2,656	3,759
Current	147,605	124,415
Discount	-7,215	-8,368
Total Loans	143,046	119,806
Acquired Loans [Member] | Commercial Leases [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-89 Days Past Due	'	0
> 90 Days Past Due and Still Accruing	'	0
Non- Accrual	'	0
Total Past Due	'	0
Current	'	0
Discount	'	0
Total Loans	'	0
Acquired Loans [Member] | Total Commercial Loans and Leases [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-89 Days Past Due	14,765	15,497
> 90 Days Past Due and Still Accruing	16,325	22,567
Non- Accrual	'	0
Total Past Due	31,090	38,064
Current	1,013,924	743,612
Discount	-41,950	-57,089
Total Loans	1,003,064	724,587
Acquired Loans [Member] | Direct Installment [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-89 Days Past Due	1,280	1,447
> 90 Days Past Due and Still Accruing	1,399	1,178
Non- Accrual	'	0
Total Past Due	2,679	2,625
Current	65,972	74,917
Discount	1,565	1,699
Total Loans	70,216	79,241
Acquired Loans [Member] | Residential Mortgages [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-89 Days Past Due	11,010	11,464
> 90 Days Past Due and Still Accruing	18,573	19,298
Non- Accrual	'	0
Total Past Due	29,583	30,762
Current	479,330	412,704
Discount	-39,860	-34,954
Total Loans	469,053	408,512
Acquired Loans [Member] | Indirect Installment [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-89 Days Past Due	45	205
> 90 Days Past Due and Still Accruing	22	31
Non- Accrual	'	0
Total Past Due	67	236
Current	2,991	6,267
Discount	-423	-617
Total Loans	2,635	5,886
Acquired Loans [Member] | Consumer Lines of Credit [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-89 Days Past Due	2,091	1,592
> 90 Days Past Due and Still Accruing	2,917	2,749
Non- Accrual	'	0
Total Past Due	5,008	4,341
Current	174,706	135,699
Discount	-7,450	-6,937
Total Loans	172,264	133,103
Acquired Loans [Member] | Other [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-89 Days Past Due	'	'
> 90 Days Past Due and Still Accruing	'	0
Non- Accrual	'	0
Total Past Due	'	0
Current	'	0
Discount	'	0
Total Loans	'	$0

Recovered_Sheet1

Loans and Allowance for Loan Losses - Summary of Commercial Loans by Credit Quality (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Originated Loans [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	$5,206,320	$4,560,991
Originated Loans [Member] | Commercial Real Estate [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	2,930,146	2,640,428
Originated Loans [Member] | Commercial and Industrial [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	2,104,559	1,761,668
Originated Loans [Member] | Commercial Leases [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	171,615	158,895
Acquired Loans [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	1,003,064	724,587
Acquired Loans [Member] | Commercial Real Estate [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	860,018	604,781
Acquired Loans [Member] | Commercial and Industrial [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	143,046	119,806
Acquired Loans [Member] | Commercial Leases [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	'	0
Pass [Member] | Originated Loans [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	4,928,845	4,244,509
Pass [Member] | Originated Loans [Member] | Commercial Real Estate [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	2,784,908	2,476,988
Pass [Member] | Originated Loans [Member] | Commercial and Industrial [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	1,973,472	1,611,530
Pass [Member] | Originated Loans [Member] | Commercial Leases [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	170,465	155,991
Pass [Member] | Acquired Loans [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	780,757	543,347
Pass [Member] | Acquired Loans [Member] | Commercial Real Estate [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	661,300	442,604
Pass [Member] | Acquired Loans [Member] | Commercial and Industrial [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	119,457	100,743
Pass [Member] | Acquired Loans [Member] | Commercial Leases [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	'	0
Special Mention [Member] | Originated Loans [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	133,371	155,760
Special Mention [Member] | Originated Loans [Member] | Commercial Real Estate [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	52,952	56,140
Special Mention [Member] | Originated Loans [Member] | Commercial and Industrial [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	80,128	97,675
Special Mention [Member] | Originated Loans [Member] | Commercial Leases [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	291	1,945
Special Mention [Member] | Acquired Loans [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	96,563	80,497
Special Mention [Member] | Acquired Loans [Member] | Commercial Real Estate [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	91,116	74,315
Special Mention [Member] | Acquired Loans [Member] | Commercial and Industrial [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	5,447	6,182
Special Mention [Member] | Acquired Loans [Member] | Commercial Leases [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	'	0
Substandard [Member] | Originated Loans [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	142,330	159,880
Substandard [Member] | Originated Loans [Member] | Commercial Real Estate [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	91,385	106,599
Substandard [Member] | Originated Loans [Member] | Commercial and Industrial [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	50,086	52,322
Substandard [Member] | Originated Loans [Member] | Commercial Leases [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	859	959
Substandard [Member] | Acquired Loans [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	125,572	97,952
Substandard [Member] | Acquired Loans [Member] | Commercial Real Estate [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	107,430	85,086
Substandard [Member] | Acquired Loans [Member] | Commercial and Industrial [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	18,142	12,866
Substandard [Member] | Acquired Loans [Member] | Commercial Leases [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	'	0
Doubtful [Member] | Originated Loans [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	1,774	842
Doubtful [Member] | Originated Loans [Member] | Commercial Real Estate [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	901	701
Doubtful [Member] | Originated Loans [Member] | Commercial and Industrial [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	873	141
Doubtful [Member] | Originated Loans [Member] | Commercial Leases [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	'	0
Doubtful [Member] | Acquired Loans [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	172	2,791
Doubtful [Member] | Acquired Loans [Member] | Commercial Real Estate [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	172	2,776
Doubtful [Member] | Acquired Loans [Member] | Commercial and Industrial [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	'	15
Doubtful [Member] | Acquired Loans [Member] | Commercial Leases [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	'	$0

Recovered_Sheet2

Loans and Allowance for Loan Losses - Summary of Consumer Loans by Payment Status (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Credit Quality [Line Items]	'	'
Total Loans	$10,967,860	$9,506,094
Non-Performing [Member]	'	'
Credit Quality [Line Items]	'	'
Non-Performing Loans	76,892	77,453
Direct Installment [Member]	'	'
Credit Quality [Line Items]	'	'
Total Loans	1,579,312	1,467,236
Direct Installment [Member] | Performing [Member]	'	'
Credit Quality [Line Items]	'	'
Performing Loans	1,495,276	1,377,418
Direct Installment [Member] | Non-Performing [Member]	'	'
Credit Quality [Line Items]	'	'
Non-Performing Loans	13,820	10,577
Residential Mortgages [Member]	'	'
Credit Quality [Line Items]	'	'
Total Loans	1,231,796	1,086,739
Residential Mortgages [Member] | Performing [Member]	'	'
Credit Quality [Line Items]	'	'
Performing Loans	747,276	664,214
Residential Mortgages [Member] | Non-Performing [Member]	'	'
Credit Quality [Line Items]	'	'
Non-Performing Loans	15,467	14,013
Indirect Installment [Member]	'	'
Credit Quality [Line Items]	'	'
Total Loans	805,836	655,587
Indirect Installment [Member] | Performing [Member]	'	'
Credit Quality [Line Items]	'	'
Performing Loans	801,862	648,499
Indirect Installment [Member] | Non-Performing [Member]	'	'
Credit Quality [Line Items]	'	'
Non-Performing Loans	1,339	1,202
Consumer Lines of Credit [Member] | Performing [Member]	'	'
Credit Quality [Line Items]	'	'
Performing Loans	913,224	832,071
Consumer Lines of Credit [Member] | Non-Performing [Member]	'	'
Credit Quality [Line Items]	'	'
Non-Performing Loans	1,783	597
Other [Member]	'	'
Credit Quality [Line Items]	'	'
Total Loans	54,261	45,183
Other [Member] | Performing [Member]	'	'
Credit Quality [Line Items]	'	'
Performing Loans	53,610	45,183
Other [Member] | Non-Performing [Member]	'	'
Credit Quality [Line Items]	'	'
Non-Performing Loans	651	'
Originated Loans [Member]	'	'
Credit Quality [Line Items]	'	'
Total Loans	9,250,628	8,154,765
Originated Loans [Member] | Direct Installment [Member]	'	'
Credit Quality [Line Items]	'	'
Total Loans	1,509,096	1,387,995
Originated Loans [Member] | Residential Mortgages [Member]	'	'
Credit Quality [Line Items]	'	'
Total Loans	762,743	678,227
Originated Loans [Member] | Indirect Installment [Member]	'	'
Credit Quality [Line Items]	'	'
Total Loans	803,201	649,701
Originated Loans [Member] | Consumer Lines of Credit [Member]	'	'
Credit Quality [Line Items]	'	'
Total Loans	915,007	832,668
Originated Loans [Member] | Other [Member]	'	'
Credit Quality [Line Items]	'	'
Total Loans	$54,261	$45,183

Recovered_Sheet3

Loans and Allowance for Loan Losses - Summary of Impaired Loans, by Class (Detail) (USD $)	9 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Financial Receivables Impaired Or Restructured [Line Items]	'	'
With allowance recorded, Specific Related Allowance	$1,771	$824
Recorded Investment	12,538	'
Specific Related Allowance	1,771	'
Commercial Real Estate [Member]	'	'
Financial Receivables Impaired Or Restructured [Line Items]	'	'
With no allowance recorded, Recorded Investment	24,718	40,472
With no allowance recorded, Unpaid Principal Balance	33,948	62,034
With no allowance recorded, Average Recorded Investment	31,351	37,376
With allowance recorded, Recorded Investment	10,571	3,603
With allowance recorded, Unpaid Principal Balance	23,263	3,818
With allowance recorded, Specific Related Allowance	901	701
With allowance recorded, Average Recorded Investment	6,688	14,379
Recorded Investment	35,289	44,075
Unpaid Principal Balance	57,211	65,852
Specific Related Allowance	901	701
Average Recorded Investment	38,039	51,755
Commercial and Industrial [Member]	'	'
Financial Receivables Impaired Or Restructured [Line Items]	'	'
With no allowance recorded, Recorded Investment	7,494	7,301
With no allowance recorded, Unpaid Principal Balance	9,191	8,669
With no allowance recorded, Average Recorded Investment	7,455	8,304
With allowance recorded, Recorded Investment	1,966	122
With allowance recorded, Unpaid Principal Balance	1,995	130
With allowance recorded, Specific Related Allowance	870	123
With allowance recorded, Average Recorded Investment	2,195	126
Recorded Investment	9,460	7,423
Unpaid Principal Balance	11,186	8,799
Specific Related Allowance	870	123
Average Recorded Investment	9,650	8,430
Commercial Leases [Member]	'	'
Financial Receivables Impaired Or Restructured [Line Items]	'	'
With no allowance recorded, Recorded Investment	651	734
With no allowance recorded, Unpaid Principal Balance	651	734
With no allowance recorded, Average Recorded Investment	719	758
With allowance recorded, Recorded Investment	'	'
With allowance recorded, Unpaid Principal Balance	'	'
With allowance recorded, Specific Related Allowance	'	'
With allowance recorded, Average Recorded Investment	'	'
Recorded Investment	651	734
Unpaid Principal Balance	651	734
Specific Related Allowance	'	'
Average Recorded Investment	719	758
Total Commercial Loans and Leases [Member]	'	'
Financial Receivables Impaired Or Restructured [Line Items]	'	'
With no allowance recorded, Recorded Investment	32,863	48,507
With no allowance recorded, Unpaid Principal Balance	43,790	71,437
With no allowance recorded, Average Recorded Investment	39,525	46,438
With allowance recorded, Recorded Investment	12,537	3,725
With allowance recorded, Unpaid Principal Balance	25,258	3,948
With allowance recorded, Specific Related Allowance	1,771	824
With allowance recorded, Average Recorded Investment	8,883	14,505
Recorded Investment	45,400	52,232
Unpaid Principal Balance	69,048	75,385
Specific Related Allowance	1,771	824
Average Recorded Investment	48,408	60,943
Direct Installment [Member]	'	'
Financial Receivables Impaired Or Restructured [Line Items]	'	'
With no allowance recorded, Recorded Investment	13,820	10,577
With no allowance recorded, Unpaid Principal Balance	14,189	10,830
With no allowance recorded, Average Recorded Investment	13,226	10,557
With allowance recorded, Recorded Investment	'	'
With allowance recorded, Unpaid Principal Balance	'	'
With allowance recorded, Specific Related Allowance	'	'
With allowance recorded, Average Recorded Investment	'	'
Recorded Investment	13,820	10,577
Unpaid Principal Balance	14,189	10,830
Specific Related Allowance	'	'
Average Recorded Investment	13,226	10,557
Residential Mortgages [Member]	'	'
Financial Receivables Impaired Or Restructured [Line Items]	'	'
With no allowance recorded, Recorded Investment	15,467	14,012
With no allowance recorded, Unpaid Principal Balance	17,397	14,560
With no allowance recorded, Average Recorded Investment	15,662	13,565
With allowance recorded, Recorded Investment	'	'
With allowance recorded, Unpaid Principal Balance	'	'
With allowance recorded, Specific Related Allowance	'	'
With allowance recorded, Average Recorded Investment	'	'
Recorded Investment	15,467	14,012
Unpaid Principal Balance	17,397	14,560
Specific Related Allowance	'	'
Average Recorded Investment	15,662	13,565
Indirect Installment [Member]	'	'
Financial Receivables Impaired Or Restructured [Line Items]	'	'
With no allowance recorded, Recorded Investment	1,339	1,202
With no allowance recorded, Unpaid Principal Balance	1,504	2,633
With no allowance recorded, Average Recorded Investment	1,436	1,127
With allowance recorded, Recorded Investment	'	'
With allowance recorded, Unpaid Principal Balance	'	'
With allowance recorded, Specific Related Allowance	'	'
With allowance recorded, Average Recorded Investment	'	'
Recorded Investment	1,339	1,202
Unpaid Principal Balance	1,504	2,633
Specific Related Allowance	'	'
Average Recorded Investment	1,436	1,127
Consumer Lines of Credit [Member]	'	'
Financial Receivables Impaired Or Restructured [Line Items]	'	'
With no allowance recorded, Recorded Investment	1,783	597
With no allowance recorded, Unpaid Principal Balance	1,791	668
With no allowance recorded, Average Recorded Investment	1,695	573
With allowance recorded, Recorded Investment	'	'
With allowance recorded, Unpaid Principal Balance	'	'
With allowance recorded, Specific Related Allowance	'	'
With allowance recorded, Average Recorded Investment	'	'
Recorded Investment	1,783	597
Unpaid Principal Balance	1,791	668
Specific Related Allowance	'	'
Average Recorded Investment	1,695	573
Other [Member]	'	'
Financial Receivables Impaired Or Restructured [Line Items]	'	'
With no allowance recorded, Recorded Investment	'	0
With no allowance recorded, Unpaid Principal Balance	'	0
With no allowance recorded, Average Recorded Investment	'	0
With allowance recorded, Recorded Investment	'	'
With allowance recorded, Unpaid Principal Balance	'	'
With allowance recorded, Specific Related Allowance	'	'
With allowance recorded, Average Recorded Investment	'	'
Recorded Investment	'	'
Unpaid Principal Balance	'	'
Specific Related Allowance	'	'
Average Recorded Investment	'	'

Recovered_Sheet4

Loans and Allowance for Loan Losses - Summary of Composition of Total TDRs (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financing Receivable, Modifications [Line Items]	'	'
Troubled debt restructurings ("TDRs")	$41,373	$41,623
Performing [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Troubled debt restructurings ("TDRs")	9,899	10,220
Non-Performing [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Troubled debt restructurings ("TDRs")	21,797	18,698
Non-Accrual [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Troubled debt restructurings ("TDRs")	$9,677	$12,705

Recovered_Sheet5

Loans and Allowance for Loan Losses - Summary of Troubled Debt Restructurings by Class of Loans (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
	Contract	Contract	Contract	Contract
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of Contracts	141	134	475	380
Pre-Modification Outstanding Recorded Investment	$2,085	$1,783	$10,676	$6,438
Post-Modification Outstanding Recorded Investment	1,948	1,747	9,876	6,033
Commercial Real Estate [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of Contracts	1	2	10	7
Pre-Modification Outstanding Recorded Investment	50	212	2,633	1,252
Post-Modification Outstanding Recorded Investment	48	207	2,187	1,031
Commercial and Industrial [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of Contracts	2	'	3	'
Pre-Modification Outstanding Recorded Investment	126	'	323	'
Post-Modification Outstanding Recorded Investment	119	'	307	'
Commercial Leases [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of Contracts	'	'	'	'
Pre-Modification Outstanding Recorded Investment	'	'	'	'
Post-Modification Outstanding Recorded Investment	'	'	'	'
Total Commercial Loans and Leases [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of Contracts	3	2	13	7
Pre-Modification Outstanding Recorded Investment	176	212	2,956	1,252
Post-Modification Outstanding Recorded Investment	167	207	2,494	1,031
Direct Installment [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of Contracts	116	117	378	300
Pre-Modification Outstanding Recorded Investment	1,323	1,199	4,922	3,078
Post-Modification Outstanding Recorded Investment	1,240	1,168	4,693	2,930
Residential Mortgages [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of Contracts	9	9	33	39
Pre-Modification Outstanding Recorded Investment	480	346	1,847	1,809
Post-Modification Outstanding Recorded Investment	470	348	1,784	1,784
Indirect Installment [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of Contracts	7	5	20	20
Pre-Modification Outstanding Recorded Investment	18	20	52	92
Post-Modification Outstanding Recorded Investment	15	18	48	84
Consumer Lines of Credit [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of Contracts	6	1	31	14
Pre-Modification Outstanding Recorded Investment	88	6	899	207
Post-Modification Outstanding Recorded Investment	56	6	857	204
Other [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of Contracts	'	'	'	'
Pre-Modification Outstanding Recorded Investment	'	'	'	'
Post-Modification Outstanding Recorded Investment	'	'	'	'

Recovered_Sheet6

Loans and Allowance for Loan Losses - Summary of Troubled Debt Restructurings by Class of Loans, Payment Default (Detail) (USD $)	3 Months Ended				9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
	Contract		Contract		Contract		Contract
Financing Receivable, Modifications [Line Items]	'		'		'		'
Number of Contracts	47	[1]	27	[1]	87	[1]	65	[1]
Recorded Investment	$449	[1]	$438	[1]	$826	[1]	$1,637	[1]
Commercial Real Estate [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Number of Contracts	'	[1]	'		'	[1]	1	[1]
Recorded Investment	'	[1]	'		'	[1]	751	[1]
Commercial and Industrial [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Number of Contracts	'	[1]	'		'	[1]	1	[1]
Recorded Investment	'	[1]	'		'	[1]	15	[1]
Commercial Leases [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Number of Contracts	'	[1]	'		'	[1]	'
Recorded Investment	'	[1]	'		'	[1]	'
Total Commercial Loans and Leases [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Number of Contracts	'	[1]	'		'	[1]	2	[1]
Recorded Investment	'	[1]	'		'	[1]	766	[1]
Direct Installment [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Number of Contracts	41	[1]	24	[1]	80	[1]	53	[1]
Recorded Investment	356	[1]	254	[1]	732	[1]	509	[1]
Residential Mortgages [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Number of Contracts	2	[1]	2	[1]	2	[1]	5	[1]
Recorded Investment	33	[1]	99	[1]	33	[1]	240	[1]
Indirect Installment [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Number of Contracts	3	[1]	'		4	[1]	4	[1]
Recorded Investment	10	[1]	'		11	[1]	37	[1]
Consumer Lines of Credit [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Number of Contracts	1	[1]	1	[1]	1	[1]	1	[1]
Recorded Investment	50	[1]	85	[1]	50	[1]	85	[1]
Other [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Number of Contracts	'	[1]	'		'	[1]	'
Recorded Investment	'	[1]	'		'	[1]	'
[1]	The recorded investment is as of period end.

Recovered_Sheet7

Loans and Allowance for Loan Losses - Summary of Changes in Allowance for Loan Losses by Class (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Schedule Of Allowance For Loan Losses [Line Items]	'	'	'	'
Balance at Beginning of Year	$116,748	$108,280	$110,784	$104,374
Charge- Offs	-8,567	-5,844	-23,368	-20,811
Recoveries	1,223	336	4,577	3,765
Net Charge- Offs	-7,344	-5,508	-18,791	-17,046
Provision for loan losses	11,197	7,280	28,608	22,724
Balance at End of Year	120,601	110,052	120,601	110,052
Originated Loans [Member]	'	'	'	'
Schedule Of Allowance For Loan Losses [Line Items]	'	'	'	'
Balance at Beginning of Year	111,188	102,849	104,884	100,194
Charge- Offs	-7,742	-5,914	-20,524	-19,456
Recoveries	1,263	895	3,593	4,085
Net Charge- Offs	-6,479	-5,019	-16,931	-15,371
Provision for loan losses	9,860	7,506	26,616	20,513
Balance at End of Year	114,569	105,336	114,569	105,336
Acquired Loans [Member]	'	'	'	'
Schedule Of Allowance For Loan Losses [Line Items]	'	'	'	'
Balance at Beginning of Year	5,560	5,431	5,900	4,180
Charge- Offs	-825	70	-2,844	-1,355
Recoveries	-40	-559	984	-320
Net Charge- Offs	-865	-489	-1,860	-1,675
Provision for loan losses	1,337	-226	1,992	2,211
Balance at End of Year	6,032	4,716	6,032	4,716
Commercial Real Estate [Member]	'	'	'	'
Schedule Of Allowance For Loan Losses [Line Items]	'	'	'	'
Balance at Beginning of Year	38,478	35,666	32,548	34,810
Charge- Offs	-1,724	-365	-5,519	-3,067
Recoveries	506	80	1,068	1,606
Net Charge- Offs	-1,218	-285	-4,451	-1,461
Provision for loan losses	-80	-538	9,083	1,494
Balance at End of Year	37,180	34,843	37,180	34,843
Commercial and Industrial [Member]	'	'	'	'
Schedule Of Allowance For Loan Losses [Line Items]	'	'	'	'
Balance at Beginning of Year	33,017	32,486	32,603	31,849
Charge- Offs	-1,796	-1,529	-2,849	-4,262
Recoveries	192	231	730	734
Net Charge- Offs	-1,604	-1,298	-2,119	-3,528
Provision for loan losses	2,883	1,460	3,812	4,327
Balance at End of Year	34,296	32,648	34,296	32,648
Commercial Leases [Member]	'	'	'	'
Schedule Of Allowance For Loan Losses [Line Items]	'	'	'	'
Balance at Beginning of Year	2,079	1,756	1,903	1,744
Charge- Offs	-167	-69	-317	-317
Recoveries	11	59	93	161
Net Charge- Offs	-156	-10	-224	-156
Provision for loan losses	282	21	526	179
Balance at End of Year	2,205	1,767	2,205	1,767
Total Commercial Loans and Leases [Member]	'	'	'	'
Schedule Of Allowance For Loan Losses [Line Items]	'	'	'	'
Balance at Beginning of Year	73,574	69,908	67,054	68,403
Charge- Offs	-3,687	-1,963	-8,685	-7,646
Recoveries	709	370	1,891	2,501
Net Charge- Offs	-2,978	-1,593	-6,794	-5,145
Provision for loan losses	3,085	943	13,421	6,000
Balance at End of Year	73,681	69,258	73,681	69,258
Direct Installment [Member]	'	'	'	'
Schedule Of Allowance For Loan Losses [Line Items]	'	'	'	'
Balance at Beginning of Year	16,844	15,993	17,824	15,130
Charge- Offs	-2,369	-2,183	-7,154	-6,824
Recoveries	271	227	821	709
Net Charge- Offs	-2,098	-1,956	-6,333	-6,115
Provision for loan losses	4,814	3,194	8,069	8,216
Balance at End of Year	19,560	17,231	19,560	17,231
Residential Mortgages [Member]	'	'	'	'
Schedule Of Allowance For Loan Losses [Line Items]	'	'	'	'
Balance at Beginning of Year	5,506	5,120	5,836	5,155
Charge- Offs	-87	-174	-356	-733
Recoveries	13	50	61	90
Net Charge- Offs	-74	-124	-295	-643
Provision for loan losses	1,218	437	1,109	921
Balance at End of Year	6,650	5,433	6,650	5,433
Indirect Installment [Member]	'	'	'	'
Schedule Of Allowance For Loan Losses [Line Items]	'	'	'	'
Balance at Beginning of Year	6,693	5,626	6,409	5,449
Charge- Offs	-898	-807	-2,396	-2,349
Recoveries	211	188	658	576
Net Charge- Offs	-687	-619	-1,738	-1,773
Provision for loan losses	364	1,120	1,699	2,451
Balance at End of Year	6,370	6,127	6,370	6,127
Consumer Lines of Credit [Member]	'	'	'	'
Schedule Of Allowance For Loan Losses [Line Items]	'	'	'	'
Balance at Beginning of Year	7,664	6,421	7,231	6,057
Charge- Offs	-360	-454	-1,023	-1,183
Recoveries	50	660	143	209
Net Charge- Offs	-310	-394	-880	-974
Provision for loan losses	587	1,052	1,590	1,996
Balance at End of Year	7,941	7,079	7,941	7,079
Other [Member]	'	'	'	'
Schedule Of Allowance For Loan Losses [Line Items]	'	'	'	'
Balance at Beginning of Year	907	-219	530	'
Charge- Offs	-341	-333	-910	-721
Recoveries	9	'	19	'
Net Charge- Offs	-332	-333	-891	-721
Provision for loan losses	-208	760	728	929
Balance at End of Year	367	208	367	208
Purchased Credit-Impaired Loans [Member]	'	'	'	'
Schedule Of Allowance For Loan Losses [Line Items]	'	'	'	'
Balance at Beginning of Year	448	325	1,000	759
Charge- Offs	-712	'	-2,614	-156
Recoveries	1	'	1	'
Net Charge- Offs	-711	'	-2,613	-156
Provision for loan losses	1,026	337	2,376	59
Balance at End of Year	763	662	763	662
Other Acquired Loans [Member]	'	'	'	'
Schedule Of Allowance For Loan Losses [Line Items]	'	'	'	'
Balance at Beginning of Year	5,112	5,106	4,900	3,421
Charge- Offs	-113	70	-230	-1,199
Recoveries	-41	-559	983	-320
Net Charge- Offs	-154	-489	753	-1,519
Provision for loan losses	311	-563	-384	2,152
Balance at End of Year	$5,269	$4,054	$5,269	$4,054

Recovered_Sheet8

Loans and Allowance for Loan Losses - Summary of Individual and Collective Allowance for Loan Losses and Loan Balances by Class (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Valuation Allowance [Line Items]	'	'
Allowance, Individually Evaluated for Impairment	$1,771	$824
Allowance, Collectively Evaluated for Impairment	112,798	104,060
Loans	10,967,860	9,506,094
Loans Outstanding, Individually Evaluated for Impairment	27,585	34,376
Loans Outstanding, Collectively Evaluated for Impairment	9,223,043	8,120,389
Commercial Real Estate [Member]	'	'
Valuation Allowance [Line Items]	'	'
Allowance, Individually Evaluated for Impairment	901	701
Allowance, Collectively Evaluated for Impairment	36,279	31,847
Loans	3,790,164	3,245,209
Loans Outstanding, Individually Evaluated for Impairment	21,619	30,133
Loans Outstanding, Collectively Evaluated for Impairment	2,908,527	2,610,295
Commercial and Industrial [Member]	'	'
Valuation Allowance [Line Items]	'	'
Allowance, Individually Evaluated for Impairment	870	123
Allowance, Collectively Evaluated for Impairment	33,426	32,480
Loans	2,247,605	1,881,474
Loans Outstanding, Individually Evaluated for Impairment	5,966	4,243
Loans Outstanding, Collectively Evaluated for Impairment	2,098,593	1,757,425
Commercial Leases [Member]	'	'
Valuation Allowance [Line Items]	'	'
Allowance, Individually Evaluated for Impairment	'	'
Allowance, Collectively Evaluated for Impairment	2,205	1,903
Loans	171,615	158,895
Loans Outstanding, Individually Evaluated for Impairment	'	'
Loans Outstanding, Collectively Evaluated for Impairment	171,615	158,895
Total Commercial Loans and Leases [Member]	'	'
Valuation Allowance [Line Items]	'	'
Allowance, Individually Evaluated for Impairment	1,771	824
Allowance, Collectively Evaluated for Impairment	71,910	66,230
Loans	6,209,384	5,285,578
Loans Outstanding, Individually Evaluated for Impairment	27,585	34,376
Loans Outstanding, Collectively Evaluated for Impairment	5,178,735	4,526,615
Direct Installment [Member]	'	'
Valuation Allowance [Line Items]	'	'
Allowance, Individually Evaluated for Impairment	'	'
Allowance, Collectively Evaluated for Impairment	19,560	17,824
Loans	1,579,312	1,467,236
Loans Outstanding, Individually Evaluated for Impairment	'	'
Loans Outstanding, Collectively Evaluated for Impairment	1,509,096	1,387,995
Residential Mortgages [Member]	'	'
Valuation Allowance [Line Items]	'	'
Allowance, Individually Evaluated for Impairment	'	'
Allowance, Collectively Evaluated for Impairment	6,650	5,836
Loans	1,231,796	1,086,739
Loans Outstanding, Individually Evaluated for Impairment	'	'
Loans Outstanding, Collectively Evaluated for Impairment	762,743	678,227
Indirect Installment [Member]	'	'
Valuation Allowance [Line Items]	'	'
Allowance, Individually Evaluated for Impairment	'	'
Allowance, Collectively Evaluated for Impairment	6,370	6,409
Loans	805,836	655,587
Loans Outstanding, Individually Evaluated for Impairment	'	'
Loans Outstanding, Collectively Evaluated for Impairment	803,201	649,701
Consumer Lines of Credit [Member]	'	'
Valuation Allowance [Line Items]	'	'
Allowance, Individually Evaluated for Impairment	'	'
Allowance, Collectively Evaluated for Impairment	7,941	7,231
Loans	1,087,271	965,771
Loans Outstanding, Individually Evaluated for Impairment	'	'
Loans Outstanding, Collectively Evaluated for Impairment	915,007	832,668
Other [Member]	'	'
Valuation Allowance [Line Items]	'	'
Allowance, Individually Evaluated for Impairment	'	'
Allowance, Collectively Evaluated for Impairment	367	530
Loans	54,261	45,183
Loans Outstanding, Individually Evaluated for Impairment	'	'
Loans Outstanding, Collectively Evaluated for Impairment	54,261	45,183
Originated Loans [Member]	'	'
Valuation Allowance [Line Items]	'	'
Loans	9,250,628	8,154,765
Originated Loans [Member] | Commercial Real Estate [Member]	'	'
Valuation Allowance [Line Items]	'	'
Loans	2,930,146	2,640,428
Originated Loans [Member] | Commercial and Industrial [Member]	'	'
Valuation Allowance [Line Items]	'	'
Loans	2,104,559	1,761,668
Originated Loans [Member] | Commercial Leases [Member]	'	'
Valuation Allowance [Line Items]	'	'
Loans	171,615	158,895
Originated Loans [Member] | Total Commercial Loans and Leases [Member]	'	'
Valuation Allowance [Line Items]	'	'
Loans	5,206,320	4,560,991
Originated Loans [Member] | Direct Installment [Member]	'	'
Valuation Allowance [Line Items]	'	'
Loans	1,509,096	1,387,995
Originated Loans [Member] | Residential Mortgages [Member]	'	'
Valuation Allowance [Line Items]	'	'
Loans	762,743	678,227
Originated Loans [Member] | Indirect Installment [Member]	'	'
Valuation Allowance [Line Items]	'	'
Loans	803,201	649,701
Originated Loans [Member] | Consumer Lines of Credit [Member]	'	'
Valuation Allowance [Line Items]	'	'
Loans	915,007	832,668
Originated Loans [Member] | Other [Member]	'	'
Valuation Allowance [Line Items]	'	'
Loans	$54,261	$45,183

Borrowings_Summary_of_ShortTer

Borrowings - Summary of Short-Term Borrowings (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Debt Disclosure [Abstract]	'	'
Securities sold under repurchase agreements	$857,217	$841,741
Federal Home Loan Bank advances	450,000	'
Federal funds purchased	165,000	270,000
Subordinated notes	128,950	129,498
Short-term borrowings	$1,601,167	$1,241,239

Borrowings_Summary_of_LongTerm

Borrowings - Summary of Long-Term Debt (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Debt Disclosure [Abstract]	'	'
Federal Home Loan Bank advances	$400,056	$50,076
Subordinated notes	83,133	84,637
Other subordinated debt	'	8,637
Convertible debt	'	578
Long-term debt	$483,189	$143,928

Borrowings_Additional_Informat

Borrowings - Additional Information (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Debt Disclosure [Abstract]	'	'
Credit available with FHLB	$3,840,436	'
Credit with FHLB used	$850,056	'
Federal Home Loan Bank advances are scheduled to mature periodically through the year	'2021	'
Effective interest rates, minimum	0.26%	1.06%
Effective interest rates, maximum	4.19%	4.19%

Junior_Subordinated_Debt_Addit

Junior Subordinated Debt - Additional Information (Detail) (USD $)	9 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
	Trust
Subordinated Borrowing [Line Items]	'	'
Number of unconsolidated subsidiary trusts	2	'
Percent of the common equity of each Trust owned by the Corporation	100.00%	'
Redemption of Corporation Issued TPS	$33,000	$130,000
BCSB Bancorp, Inc. (BCSB) [Member]	'	'
Subordinated Borrowing [Line Items]	'	'
Junior subordinated debt assumed in acquisition	$16,500	'

Junior_Subordinated_Debt_Junio

Junior Subordinated Debt - Junior Subordinated Debt Trusts (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2014
In Thousands, unless otherwise specified			Trust Preferred Securities Subject to Mandatory Redemption [Member]	Common Stock Subject to Mandatory Redemption [Member]	F.N.B. Statutory Trust II [Member]	F.N.B. Statutory Trust II [Member]	F.N.B. Statutory Trust II [Member]	Omega Financial Capital Trust I [Member]	Omega Financial Capital Trust I [Member]	Omega Financial Capital Trust I [Member]
						Trust Preferred Securities Subject to Mandatory Redemption [Member]	Common Stock Subject to Mandatory Redemption [Member]		Trust Preferred Securities Subject to Mandatory Redemption [Member]	Common Stock Subject to Mandatory Redemption [Member]
Subordinated Borrowing [Line Items]	'	'	'	'	'	'	'	'	'	'
Junior subordinated debt	$58,233	$75,205	$57,500	$1,779	$22,165	$21,500	$665	$36,068	$36,000	$1,114
Stated Maturity Date	'	'	'	'	15-Jun-36	'	'	18-Oct-34	'	'
Interest Rate	'	'	'	'	1.88%	'	'	2.42%	'	'
Description of variable rate	'	'	'	'	'Variable; LIBOR + 165 basis points (bps)	'	'	'Variable; LIBOR + 219 bps	'	'
Basis points	'	'	'	'	1.65%	'	'	2.19%	'	'

Derivative_Instruments_Additio

Derivative Instruments - Additional Information (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Derivative [Line Items]	'	'
Fair value of derivatives, in a net liability position	$37,100	$38,239
Collateral with derivative counterparties, fair value	29,796	37,427
Cash collateral posted	10,986	1,976
Additional amount in excess of posted collateral required in case of breached agreements	1,963	2,224
Swap [Member] | Short [Member]	'	'
Derivative [Line Items]	'	'
Number of swaps	330	'
Notional amount of swaps	950,427	'
Swap [Member] | Long [Member]	'	'
Derivative [Line Items]	'	'
Number of swaps	296	'
Notional amount of swaps	$1,150,427	'

Derivative_Instruments_Offsett

Derivative Instruments - Offsetting of Derivative Assets (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Derivatives, Fair Value [Line Items]	'	'
Gross Amount	$34,628	$33,317
Gross Amounts Offset in the Balance Sheet, Derivative Assets	'	'
Net Amount Presented in the Balance Sheet	34,628	33,317
Derivative Assets Subject to Master Netting Arrangement [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Net Amount Presented in the Balance Sheet	1,748	3,579
Derivative Assets Subject to Master Netting Arrangement [Member] | Interest Rate Contracts [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Gross Amount	1,698	3,547
Gross Amounts Offset in the Balance Sheet, Derivative Assets	'	'
Net Amount Presented in the Balance Sheet	1,698	3,547
Derivative Assets Subject to Master Netting Arrangement [Member] | Equity Contracts [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Gross Amount	50	32
Gross Amounts Offset in the Balance Sheet, Derivative Assets	'	'
Net Amount Presented in the Balance Sheet	50	32
Derivative Assets Not Subject to Master Netting Arrangement [Member] | Interest Rate Contracts [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Gross Amount	32,880	29,738
Gross Amounts Offset in the Balance Sheet, Derivative Assets	'	'
Net Amount Presented in the Balance Sheet	$32,880	$29,738

Derivative_Instruments_Offsett1

Derivative Instruments - Offsetting of Derivative Liabilities (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Derivatives, Fair Value [Line Items]	'	'
Gross Amount	$38,655	$43,369
Gross Amounts Offset in the Balance Sheet, Derivative Liabilities	'	'
Net Amount Presented in the Balance Sheet	38,655	43,369
Derivative Liabilities Subject to Master Netting Arrangement [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Net Amount Presented in the Balance Sheet	37,565	40,323
Derivative Liabilities Subject to Master Netting Arrangement [Member] | Interest Rate Contracts [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Gross Amount	37,565	40,323
Gross Amounts Offset in the Balance Sheet, Derivative Liabilities	'	'
Net Amount Presented in the Balance Sheet	37,565	40,323
Derivative Liabilities Not Subject to Master Netting Arrangement [Member] | Interest Rate Contracts [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Gross Amount	1,040	3,014
Gross Amounts Offset in the Balance Sheet, Derivative Liabilities	'	'
Net Amount Presented in the Balance Sheet	1,040	3,014
Derivative Liabilities Not Subject to Master Netting Arrangement [Member] | Equity Contracts [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Gross Amount	50	32
Gross Amounts Offset in the Balance Sheet, Derivative Liabilities	'	'
Net Amount Presented in the Balance Sheet	$50	$32

Derivative_Instruments_Derivat

Derivative Instruments - Derivative Assets (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Derivative [Line Items]	'	'
Net Amount Presented in the Balance Sheet	$34,628	$33,317
Gross Amounts Not Offset in the Balance Sheet Cash Collateral Received, Derivative Assets	554	53
Net Amount, Derivative Assets	'	82
Derivative Assets Subject to Master Netting Arrangement [Member]	'	'
Derivative [Line Items]	'	'
Net Amount Presented in the Balance Sheet	1,748	3,579
Gross Amounts Not Offset in the Balance Sheet Financial Instruments, Derivative Assets	1,194	3,444
Counterparty B [Member]	'	'
Derivative [Line Items]	'	'
Gross Amounts Not Offset in the Balance Sheet Cash Collateral Received, Derivative Assets	'	0
Net Amount, Derivative Assets	'	0
Counterparty B [Member] | Derivative Assets Subject to Master Netting Arrangement [Member]	'	'
Derivative [Line Items]	'	'
Net Amount Presented in the Balance Sheet	30	24
Gross Amounts Not Offset in the Balance Sheet Financial Instruments, Derivative Assets	30	24
Counterparty D [Member]	'	'
Derivative [Line Items]	'	'
Gross Amounts Not Offset in the Balance Sheet Cash Collateral Received, Derivative Assets	'	'
Net Amount, Derivative Assets	'	'
Counterparty D [Member] | Derivative Assets Subject to Master Netting Arrangement [Member]	'	'
Derivative [Line Items]	'	'
Net Amount Presented in the Balance Sheet	67	566
Gross Amounts Not Offset in the Balance Sheet Financial Instruments, Derivative Assets	67	566
Counterparty E [Member]	'	'
Derivative [Line Items]	'	'
Gross Amounts Not Offset in the Balance Sheet Cash Collateral Received, Derivative Assets	'	'
Net Amount, Derivative Assets	'	'
Counterparty E [Member] | Derivative Assets Subject to Master Netting Arrangement [Member]	'	'
Derivative [Line Items]	'	'
Net Amount Presented in the Balance Sheet	657	1,696
Gross Amounts Not Offset in the Balance Sheet Financial Instruments, Derivative Assets	657	1,696
Counterparty F [Member]	'	'
Derivative [Line Items]	'	'
Gross Amounts Not Offset in the Balance Sheet Cash Collateral Received, Derivative Assets	'	'
Net Amount, Derivative Assets	'	82
Counterparty F [Member] | Derivative Assets Subject to Master Netting Arrangement [Member]	'	'
Derivative [Line Items]	'	'
Net Amount Presented in the Balance Sheet	137	355
Gross Amounts Not Offset in the Balance Sheet Financial Instruments, Derivative Assets	137	273
Counterparty G [Member]	'	'
Derivative [Line Items]	'	'
Gross Amounts Not Offset in the Balance Sheet Cash Collateral Received, Derivative Assets	'	'
Net Amount, Derivative Assets	'	'
Counterparty G [Member] | Derivative Assets Subject to Master Netting Arrangement [Member]	'	'
Derivative [Line Items]	'	'
Net Amount Presented in the Balance Sheet	71	251
Gross Amounts Not Offset in the Balance Sheet Financial Instruments, Derivative Assets	71	251
Counterparty I [Member]	'	'
Derivative [Line Items]	'	'
Gross Amounts Not Offset in the Balance Sheet Cash Collateral Received, Derivative Assets	'	'
Net Amount, Derivative Assets	'	'
Counterparty I [Member] | Derivative Assets Subject to Master Netting Arrangement [Member]	'	'
Derivative [Line Items]	'	'
Net Amount Presented in the Balance Sheet	232	634
Gross Amounts Not Offset in the Balance Sheet Financial Instruments, Derivative Assets	232	634
Counterparty J [Member]	'	'
Derivative [Line Items]	'	'
Gross Amounts Not Offset in the Balance Sheet Cash Collateral Received, Derivative Assets	554	53
Net Amount, Derivative Assets	'	'
Counterparty J [Member] | Derivative Assets Subject to Master Netting Arrangement [Member]	'	'
Derivative [Line Items]	'	'
Net Amount Presented in the Balance Sheet	554	53
Gross Amounts Not Offset in the Balance Sheet Financial Instruments, Derivative Assets	'	'

Derivative_Instruments_Derivat1

Derivative Instruments - Derivative Liabilities (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Derivative [Line Items]	'	'
Net Amount Presented in the Balance Sheet	$38,655	$43,369
Derivative Liabilities Subject to Master Netting Arrangement [Member]	'	'
Derivative [Line Items]	'	'
Net Amount Presented in the Balance Sheet	37,565	40,323
Gross Amount Not Offset in the Balance Sheet Financial Instruments, Derivative Liabilities	27,901	36,581
Gross Amount Not Offset in the Balance Sheet Cash Collateral Pledged, Derivative Liabilities	7,851	1,610
Net Amount, Derivative Liabilities	1,813	2,132
Derivative Liabilities Subject to Master Netting Arrangement [Member] | Counterparty A [Member]	'	'
Derivative [Line Items]	'	'
Net Amount Presented in the Balance Sheet	4,033	4,934
Gross Amount Not Offset in the Balance Sheet Financial Instruments, Derivative Liabilities	4,033	4,934
Gross Amount Not Offset in the Balance Sheet Cash Collateral Pledged, Derivative Liabilities	'	0
Net Amount, Derivative Liabilities	'	0
Derivative Liabilities Subject to Master Netting Arrangement [Member] | Counterparty B [Member]	'	'
Derivative [Line Items]	'	'
Net Amount Presented in the Balance Sheet	1,882	3,249
Gross Amount Not Offset in the Balance Sheet Financial Instruments, Derivative Liabilities	1,882	3,249
Gross Amount Not Offset in the Balance Sheet Cash Collateral Pledged, Derivative Liabilities	'	0
Net Amount, Derivative Liabilities	'	0
Derivative Liabilities Subject to Master Netting Arrangement [Member] | Counterparty C [Member]	'	'
Derivative [Line Items]	'	'
Net Amount Presented in the Balance Sheet	1,160	1,431
Gross Amount Not Offset in the Balance Sheet Financial Instruments, Derivative Liabilities	1,160	1,431
Gross Amount Not Offset in the Balance Sheet Cash Collateral Pledged, Derivative Liabilities	'	0
Net Amount, Derivative Liabilities	'	0
Derivative Liabilities Subject to Master Netting Arrangement [Member] | Counterparty D [Member]	'	'
Derivative [Line Items]	'	'
Net Amount Presented in the Balance Sheet	7,105	9,614
Gross Amount Not Offset in the Balance Sheet Financial Instruments, Derivative Liabilities	7,105	9,614
Gross Amount Not Offset in the Balance Sheet Cash Collateral Pledged, Derivative Liabilities	'	0
Net Amount, Derivative Liabilities	'	0
Derivative Liabilities Subject to Master Netting Arrangement [Member] | Counterparty E [Member]	'	'
Derivative [Line Items]	'	'
Net Amount Presented in the Balance Sheet	3,509	6,257
Gross Amount Not Offset in the Balance Sheet Financial Instruments, Derivative Liabilities	3,509	6,257
Gross Amount Not Offset in the Balance Sheet Cash Collateral Pledged, Derivative Liabilities	'	0
Net Amount, Derivative Liabilities	'	0
Derivative Liabilities Subject to Master Netting Arrangement [Member] | Counterparty F [Member]	'	'
Derivative [Line Items]	'	'
Net Amount Presented in the Balance Sheet	719	13
Gross Amount Not Offset in the Balance Sheet Financial Instruments, Derivative Liabilities	667	13
Gross Amount Not Offset in the Balance Sheet Cash Collateral Pledged, Derivative Liabilities	'	0
Net Amount, Derivative Liabilities	52	0
Derivative Liabilities Subject to Master Netting Arrangement [Member] | Counterparty G [Member]	'	'
Derivative [Line Items]	'	'
Net Amount Presented in the Balance Sheet	4,146	5,309
Gross Amount Not Offset in the Balance Sheet Financial Instruments, Derivative Liabilities	4,146	5,309
Gross Amount Not Offset in the Balance Sheet Cash Collateral Pledged, Derivative Liabilities	'	0
Net Amount, Derivative Liabilities	'	0
Derivative Liabilities Subject to Master Netting Arrangement [Member] | Counterparty H [Member]	'	'
Derivative [Line Items]	'	'
Net Amount Presented in the Balance Sheet	1,761	2,257
Gross Amount Not Offset in the Balance Sheet Financial Instruments, Derivative Liabilities	'	125
Gross Amount Not Offset in the Balance Sheet Cash Collateral Pledged, Derivative Liabilities	'	0
Net Amount, Derivative Liabilities	1,761	2,132
Derivative Liabilities Subject to Master Netting Arrangement [Member] | Counterparty I [Member]	'	'
Derivative [Line Items]	'	'
Net Amount Presented in the Balance Sheet	5,399	5,649
Gross Amount Not Offset in the Balance Sheet Financial Instruments, Derivative Liabilities	5,399	5,649
Gross Amount Not Offset in the Balance Sheet Cash Collateral Pledged, Derivative Liabilities	'	0
Net Amount, Derivative Liabilities	'	0
Derivative Liabilities Subject to Master Netting Arrangement [Member] | Counterparty J [Member]	'	'
Derivative [Line Items]	'	'
Net Amount Presented in the Balance Sheet	7,851	1,610
Gross Amount Not Offset in the Balance Sheet Financial Instruments, Derivative Liabilities	'	0
Gross Amount Not Offset in the Balance Sheet Cash Collateral Pledged, Derivative Liabilities	7,851	1,610
Net Amount, Derivative Liabilities	'	$0

Derivative_Instruments_Effect_

Derivative Instruments - Effect of Corporation's Derivative Financial Instruments on Income Statement (Detail) (Interest Rate Contracts [Member], Other Income [Member], USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Interest Rate Contracts [Member] | Other Income [Member]	'	'
Derivative [Line Items]	'	'
Interest Rate Products	($9)	$40

Commitments_Credit_Risk_and_Co2

Commitments, Credit Risk and Contingencies - Summary of Off-Balance Sheet Credit Risk Information (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Commitments to Extend Credit [Member]	'	'
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]	'	'
Extended credit and standby letters of credit	$3,445,792	$2,897,748
Standby Letters of Credit [Member]	'	'
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]	'	'
Extended credit and standby letters of credit	$122,290	$114,298

Commitments_Credit_Risk_and_Co3

Commitments, Credit Risk and Contingencies - Additional Information (Detail)	Sep. 30, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Percentage of Commitments to extend credit dependent upon the financial condition of the customers	74.20%

Stock_Incentive_Plans_Addition

Stock Incentive Plans - Additional Information (Detail) (USD $)

9 Months Ended

9 Months Ended

9 Months Ended

In Thousands, except Share data, unless otherwise specified

Sep. 30, 2014

Sep. 30, 2013

Jun. 16, 2009

Sep. 30, 2014

Sep. 30, 2014

Apr. 06, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Apr. 06, 2013

Jan. 01, 2012

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Parkvale Financial Corporation [Member]

Annapolis Bancorp, Inc. [Member]

Annapolis Bancorp, Inc. [Member]

Restricted Stock [Member]

Restricted Stock [Member]

Employee Stock Option [Member]

Employee Stock Option [Member]

Warrant Expires In 2019 [Member]

Warrant Expires In 2019 [Member]

Warrant Expires in 2018 [Member]

Time-Based Awards [Member]

Performance-Based Awards [Member]

Performance-Based Awards [Member]

Service-Based Awards [Member]

Discretionary Service-Based Awards [Member]

Annapolis Bancorp, Inc. [Member]

Parkvale Financial Corporation [Member]

Scenario, Previously Reported [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Vesting period of awards issued, years

'

'

'

'

'

'

'

'

'

'

'

'

'

'3 years

'3 years

'4 years

'3 years

'5 years

Restricted stock awards issued

364,065

344,479

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Aggregate, weighted average grant date fair value

$4,954

$3,802

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Common stock shares available under Incentive Compensation Plans

2,419,585

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Share-based compensation expense related to restricted stock awards

'

'

'

'

'

'

$2,294

$3,338

'

'

'

'

'

'

'

'

'

'

Tax benefit related to restricted stock awards

'

'

'

'

'

'

803

1,186

'

'

'

'

'

'

'

'

'

'

Total fair value of awards vested

'

'

'

'

'

'

10,670

8,259

'

'

'

'

'

'

'

'

'

'

Unrecognized compensation cost related to unvested restricted stock awards

5,950

'

'

'

'

'

5,950

'

'

'

'

'

'

'

2,583

'

3,367

'

Amount subject to accelerated vesting under Incentive Compensation Plan

'

'

'

'

'

'

71

'

'

'

'

'

'

'

'

'

'

'

Stock options exercised

140,817

36,647

'

'

'

'

'

'

135,417

36,647

'

'

'

'

'

'

'

'

Intrinsic value of outstanding and exercisable stock options

$4,413

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Maximum common shares available for purchase under warrants

1,302,083

'

651,042

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Warrant issued, exercise price

'

'

'

'

'

$3.57

'

'

'

'

$11.52

$3.57

$5.81

'

'

'

'

'

Warrant issued

'

'

'

819,640

342,564

'

'

'

'

'

'

'

'

'

'

'

'

'

Stock_Incentive_Plans_Summary_

Stock Incentive Plans - Summary of Information Concerning Restricted Stock Awards (Detail) (USD $)	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'	'
Awards, Unvested awards outstanding at beginning of period	1,729,033	1,913,073
Awards, Granted	364,065	344,479
Awards, Net adjustment due to performance	-87,512	73,835
Awards, Vested	-703,428	-734,129
Awards, Forfeited	-50,849	-37,175
Awards, Dividend reinvestment	34,521	43,934
Awards, Unvested awards outstanding at end of period	1,285,830	1,604,017
Weighted Average Grant Price per Share, Unvested awards outstanding at beginning of period	$10.23	$9.17
Weighted Average Grant Price per Share, Granted	$13.61	$11.04
Weighted Average Grant Price per Share, Net adjustment due to performance	$11.41	$10.60
Weighted Average Grant Price per Share, Vested	$8.79	$7.60
Weighted Average Grant Price per Share, Forfeited	$11.47	$10.40
Weighted Average Grant Price per Share, Dividend reinvestment	$12.73	$11.66
Weighted Average Grant Price per Share, Unvested awards outstanding at end of period	$11.90	$10.26

Stock_Incentive_Plans_Componen

Stock Incentive Plans - Components of Restricted Stock Awards (Detail) (USD $)	9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Unvested awards	1,285,830	1,729,033	1,604,017	1,913,073
Unrecognized compensation expense	$5,950	'	'	'
Intrinsic value	15,417	'	'	'
Weighted average remaining life (in years)	'2 years 1 month 28 days	'	'	'
Service-Based Awards [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Unvested awards	498,890	'	'	'
Unrecognized compensation expense	3,367	'	'	'
Intrinsic value	5,982	'	'	'
Weighted average remaining life (in years)	'2 years 3 months 4 days	'	'	'
Performance-Based Awards [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Unvested awards	786,940	'	'	'
Unrecognized compensation expense	2,583	'	'	'
Intrinsic value	$9,435	'	'	'
Weighted average remaining life (in years)	'2 years 1 month 6 days	'	'	'

Stock_Incentive_Plans_Summary_1

Stock Incentive Plans - Summary of Information Concerning Stock Option Awards (Detail) (USD $)	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'	'
Shares, Options outstanding at beginning of period	533,524	640,050
Shares, Assumed from acquisition	805,507	19,223
Shares, Exercised	-140,817	-36,647
Shares, Forfeited	-54,962	-298,150
Shares, Options outstanding and exercisable at end of period	1,143,252	324,476
Weighted Average Price per Share, Options outstanding at beginning of period	$11.50	$13.21
Weighted Average Price per Share, Assumed from acquisition	$7.39	$7.92
Weighted Average Price per Share, Exercised	$6.21	$8.90
Weighted Average Price per Share, Forfeited	$24.41	$15.10
Weighted Average Price per Share, Options outstanding and exercisable at end of period	$8.64	$11.65

Retirement_Plans_Additional_In

Retirement Plans - Additional Information (Detail) (USD $)	9 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2008
	RetirementPlans
Disclosure Retirement Plans [Abstract]	'	'	'
Number of supplemental non-qualified retirement plans sponsored by the Corporation	2	'	'
Consecutive calendar years used to calculate BRP benefits	'	'	'5 years
Term of employment for consideration of BRP	'	'	'10 years
Annuity equivalent of contribution to defined contribution plan deducted from monthly benefit of basic retirement plan	3.00%	'	'
Percent of employer match	100.00%	'	'
Employee contribution percentage	4.00%	'	'
Additional automatic contribution increase, percentage	3.00%	'	'
Additional discretionary contribution, performance goals, percentage	2.00%	'	'
Contribution expense of the Corporation	$7,595	$6,975	'

Retirement_Plans_Net_Periodic_

Retirement Plans - Net Periodic Benefit Credit for Defined Benefit Plans (Detail) (Defined Benefit Plans [Member], USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Defined Benefit Plans [Member]	'	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'	'
Service cost	$15	$15	$47	$51
Interest cost	1,610	1,437	4,802	4,291
Expected return on plan assets	-2,486	-2,271	-7,460	-6,811
Amortization:	'	'	'	'
Unrecognized net transition asset	-6	-24	-16	-70
Unrecognized prior service cost	2	2	6	6
Unrecognized loss	347	575	1,021	1,689
Net periodic pension credit	($518)	($266)	($1,600)	($844)

Comprehensive_Income_Component

Comprehensive Income - Components of Comprehensive Income, Net of Related Tax (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Components Of Comprehensive Income [Abstract]	'	'	'	'
Net income	$35,391	$31,634	$104,746	$89,365
Securities available for sale, Unrealized (losses) gains arising during the period, net of tax (benefit) expense of $(1,551), $(2,635), $7,065 and $(8,835)	-2,881	-4,894	13,120	-16,408
Securities available for sale, Reversal of non-credit related losses on debt securities not expected to be sold, net of tax expense of $3,335	'	0	6,192	0
Securities available for sale, Reclassification adjustment for gains included in net income, net of tax expense of $412, $2, $3,995 and $260	-766	-3	-7,420	-483
Unrealized (losses) gains on derivative instruments arising during the period, net of tax (benefit) expense of $(253), $239, $2,112 and $(2,215)	-469	443	3,922	-4,113
Unrealized gains on pension and postretirement benefit obligations arising during the period, net of tax expense of $121, $194, $355 and $569	224	360	659	1,057
Other comprehensive (loss) income	-3,892	-4,094	16,473	-19,947
Comprehensive income	$31,499	$27,540	$121,219	$69,418

Comprehensive_Income_Component1

Comprehensive Income - Components of Comprehensive Income, Net of Related Tax (Parenthetical) (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Components Of Comprehensive Income [Abstract]	'	'	'	'
Securities available for sale, Unrealized (losses) gains arising during the period, tax (benefit) expense	($1,551)	($2,635)	$7,065	($8,835)
Securities available for sale, Reversal of non-credit related losses on debt securities not expected to be sold, tax expense	3,335	'	3,335	'
Securities available for sale, Reclassification adjustment for gains included in net income, tax expense	412	2	3,995	260
Unrealized (losses) gains on derivative instruments arising during the period, tax (benefit) expense	-253	239	2,112	-2,215
Unrealized gains on pension and postretirement benefit obligations arising during the period, tax expense	$121	$194	$355	$569

Comprehensive_Income_Changes_i

Comprehensive Income - Changes in Accumulated Other Comprehensive Income, Net of Tax, by Component (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Accumulated other comprehensive income (loss), balance at beginning of period	'	'	($56,924)	'
Other comprehensive income (loss) before reclassifications	'	'	23,893	'
Amounts reclassified from accumulated other comprehensive income	'	'	-7,420	'
Net current period other comprehensive income (loss)	-3,892	-4,094	16,473	-19,947
Accumulated other comprehensive income (loss), balance at end of period	-40,451	'	-40,451	'
Unrealized Net Gains (Losses) on Securities Available for Sale [Member]	'	'	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Accumulated other comprehensive income (loss), balance at beginning of period	'	'	-11,874	'
Other comprehensive income (loss) before reclassifications	'	'	13,120	'
Amounts reclassified from accumulated other comprehensive income	'	'	-7,420	'
Net current period other comprehensive income (loss)	'	'	5,700	'
Accumulated other comprehensive income (loss), balance at end of period	-6,174	'	-6,174	'
Non-Credit Related Loss on Debt Securities not Expected to be Sold [Member]	'	'	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Accumulated other comprehensive income (loss), balance at beginning of period	'	'	-6,192	'
Other comprehensive income (loss) before reclassifications	'	'	6,192	'
Amounts reclassified from accumulated other comprehensive income	'	'	'	'
Net current period other comprehensive income (loss)	'	'	6,192	'
Accumulated other comprehensive income (loss), balance at end of period	'	'	'	'
Unrealized Losses on Derivative Instruments [Member]	'	'	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Accumulated other comprehensive income (loss), balance at beginning of period	'	'	-6,586	'
Other comprehensive income (loss) before reclassifications	'	'	3,922	'
Amounts reclassified from accumulated other comprehensive income	'	'	'	'
Net current period other comprehensive income (loss)	'	'	3,922	'
Accumulated other comprehensive income (loss), balance at end of period	-2,664	'	-2,664	'
Unrecognized Pension and Postretirement Obligations [Member]	'	'	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Accumulated other comprehensive income (loss), balance at beginning of period	'	'	-32,272	'
Other comprehensive income (loss) before reclassifications	'	'	659	'
Amounts reclassified from accumulated other comprehensive income	'	'	'	'
Net current period other comprehensive income (loss)	'	'	659	'
Accumulated other comprehensive income (loss), balance at end of period	($31,613)	'	($31,613)	'

Comprehensive_Income_Summary_o

Comprehensive Income - Summary of Reclassifications Out of Accumulated Other Comprehensive Income (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Net securities gains	$1,178	$5	$11,415	$757
Tax (expense) benefit	15,736	9,977	45,497	34,024
Net Income	35,391	31,634	104,746	89,365
Amount Reclassified from Other Comprehensive Income [Member] | Unrealized Net Gains (Losses) on Securities Available for Sale [Member]	'	'	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Net securities gains	'	'	-11,415	'
Tax (expense) benefit	'	'	-3,995	'
Net Income	'	'	($7,420)	'

Earnings_Per_Common_Share_Comp

Earnings Per Common Share - Computation of Basic and Diluted Earnings Per Common Share (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Earnings Per Share [Abstract]	'	'	'	'
Net income	$35,391	$31,634	$104,746	$89,365
Less: Preferred stock dividends	2,010	'	6,342	'
Net income available to common stockholders	$33,381	$31,634	$98,404	$89,365
Basic weighted average common shares outstanding	167,260,386	144,759,887	165,229,206	142,949,134
Net effect of dilutive stock options, warrants, restricted stock and convertible debt	1,623,741	1,686,555	1,695,637	1,520,683
Diluted weighted average common shares outstanding	168,884,127	146,446,442	166,924,843	144,469,817
Basic	$0.20	$0.22	$0.60	$0.63
Diluted	$0.20	$0.22	$0.59	$0.62

Earnings_Per_Common_Share_Addi

Earnings Per Common Share - Additional Information (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Earnings Per Share [Abstract]	'	'	'	'
Common stock excluded from computation of diluted earnings per common share	32,419	17,081	38,151	41,779

Cash_Flow_Information_Summary_

Cash Flow Information - Summary of Cash Flow Information (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Statement of Cash Flows [Abstract]	'	'
Interest paid on deposits and other borrowings	$31,804	$36,340
Income taxes paid	17,000	18,700
Transfers of loans to other real estate owned	7,784	10,856
Financing of other real estate owned sold	$287	$549

Business_Segments_Additional_I

Business Segments - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2014
	Segment
Segment Reporting [Abstract]	'
Number of reportable segments	4

Business_Segments_Financial_In

Business Segments - Financial Information for Segments of Corporation (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Segment Reporting Information [Line Items]	'	'	'	'	'
Interest income	$131,566	$109,790	$373,886	$322,749	'
Interest expense	10,947	10,536	31,250	33,653	'
Net interest income	120,619	99,254	342,636	289,096	'
Provision for loan losses	11,197	7,280	28,608	22,724	'
Non-interest income	37,552	32,810	118,812	103,119	'
Non-interest expense	93,392	81,106	275,398	240,039	'
Intangible amortization	2,455	2,067	7,199	6,063	'
Income tax expense (benefit)	15,736	9,977	45,497	34,024	'
Net income (loss)	35,391	31,634	104,746	89,365	'
Total assets	15,757,045	12,790,279	15,757,045	12,790,279	13,563,405
Total intangibles	879,288	748,909	879,288	748,909	'
Operating Segments [Member] | Community Banking [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Interest income	120,122	98,716	339,974	289,984	'
Interest expense	9,435	7,552	26,413	24,449	'
Net interest income	110,687	91,164	313,561	265,535	'
Provision for loan losses	9,427	5,432	23,148	17,283	'
Non-interest income	27,179	24,317	86,512	73,955	'
Non-interest expense	79,243	68,091	231,390	198,395	'
Intangible amortization	2,282	1,890	6,680	5,531	'
Income tax expense (benefit)	14,347	9,552	41,738	32,486	'
Net income (loss)	32,567	30,516	97,117	85,795	'
Total assets	15,584,832	12,610,043	15,584,832	12,610,043	'
Total intangibles	856,464	725,389	856,464	725,389	'
Operating Segments [Member] | Wealth Management [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Interest income	'	'	'	'	'
Interest expense	'	'	'	'	'
Net interest income	'	'	'	'	'
Provision for loan losses	'	'	'	'	'
Non-interest income	8,174	6,916	23,530	21,294	'
Non-interest expense	6,294	5,850	19,038	18,338	'
Intangible amortization	72	76	216	228	'
Income tax expense (benefit)	656	366	1,555	1,009	'
Net income (loss)	1,152	624	2,721	1,719	'
Total assets	21,892	19,614	21,892	19,614	'
Total intangibles	10,792	11,084	10,792	11,084	'
Operating Segments [Member] | Insurance [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Interest income	24	27	74	82	'
Interest expense	'	'	'	'	'
Net interest income	24	27	74	82	'
Provision for loan losses	'	'	'	'	'
Non-interest income	3,373	3,222	10,582	10,024	'
Non-interest expense	2,943	2,799	8,900	8,420	'
Intangible amortization	101	101	303	304	'
Income tax expense (benefit)	128	128	521	497	'
Net income (loss)	225	221	932	885	'
Total assets	19,148	19,788	19,148	19,788	'
Total intangibles	10,223	10,627	10,223	10,627	'
Operating Segments [Member] | Consumer Finance [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Interest income	9,773	9,600	28,716	27,920	'
Interest expense	826	839	2,481	2,533	'
Net interest income	8,947	8,761	26,235	25,387	'
Provision for loan losses	1,519	1,725	4,754	4,930	'
Non-interest income	719	681	2,120	2,029	'
Non-interest expense	4,983	4,724	14,800	14,063	'
Intangible amortization	'	'	'	'	'
Income tax expense (benefit)	1,216	1,145	3,386	3,234	'
Net income (loss)	1,948	1,848	5,415	5,189	'
Total assets	182,301	182,695	182,301	182,695	'
Total intangibles	1,809	1,809	1,809	1,809	'
Parent and Other [Member]	'	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'	'
Interest income	1,647	1,447	5,122	4,763	'
Interest expense	686	2,145	2,356	6,671	'
Net interest income	961	-698	2,766	-1,908	'
Provision for loan losses	251	123	706	511	'
Non-interest income	-1,893	-2,326	-3,932	-4,183	'
Non-interest expense	-71	-358	1,270	823	'
Intangible amortization	'	'	'	'	'
Income tax expense (benefit)	-611	-1,214	-1,703	-3,202	'
Net income (loss)	-501	-1,575	-1,439	-4,223	'
Total assets	-51,128	-41,861	-51,128	-41,861	'
Total intangibles	'	'	'	'	'

Fair_Value_Measurements_Additi

Fair Value Measurements - Additional Information (Detail) (USD $)	9 Months Ended	12 Months Ended	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014	Sep. 30, 2013
	Securities	Securities	Assets Still Held [Member]	Assets Still Held [Member]
Fair Value Measurements Disclosure [Line Items]	'	'	'	'
Percentage of securities using market-based information	99.90%	'	'	'
Percentage of securities using model-based techniques	0.10%	'	'	'
Minimum corporation reserves for commercial loan	$500	'	'	'
Number of single-issuer trust preferred securities transferred between hierarchy levels	0	4	'	'
Change in unrealized gains or losses included in earnings relating to assets still held	13,766	78	0	0
Impaired loans, carrying amount	12,538	'	'	'
Allocated allowance for loan losses	1,771	'	'	'
Fair value of allocated allowance	12,117	'	'	'
Estimated costs to sell	1,350	'	'	'
Provision for fair value measurements included in allowance for loan losses	1,374	'	'	'
Carrying amount of OREO	7,164	'	'	'
Written down of OREO	5,476	'	'	'
Fair value of OREO	6,206	19,442	'	'
Estimated cost to sell OREO	730	'	'	'
Loss from OREO included in earnings	$1,688	'	'	'
Short-term borrowings approximate fair value for amounts that mature, days, less than	'90 days	'	'	'

Fair_Value_Measurements_Balanc

Fair Value Measurements - Balances of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Assets measured at fair value, Available for sale debt securities	$1,438,415	$1,139,524
Assets measured at fair value, Available for sale equity securities	1,320	2,126
Assets measured at fair value, Available for sale securities	1,439,735	1,141,650
Derivative financial instruments	34,628	33,317
Assets measured at fair value, Total	1,474,363	1,174,967
Derivative financial instruments	38,655	43,369
Liabilities measured at fair value, Total	38,655	43,369
U.S. Treasury [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Assets measured at fair value, Available for sale debt securities	29,534	'
U.S. Government-Sponsored Entities [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Assets measured at fair value, Available for sale debt securities	275,508	330,985
States of the U.S. and Political Subdivisions [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Assets measured at fair value, Available for sale debt securities	13,894	17,002
Other Securities [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Assets measured at fair value, Available for sale debt securities	16,478	16,100
Agency Mortgage-Backed Securities [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Assets measured at fair value, Available for sale debt securities	496,483	250,881
Agency Collateralized Mortgage Obligations [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Assets measured at fair value, Available for sale debt securities	596,935	491,199
Non-Agency Collateralized Mortgage Obligations [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Assets measured at fair value, Available for sale debt securities	1,547	1,762
Commercial Mortgage-Backed Securities [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Assets measured at fair value, Available for sale debt securities	8,036	'
Financial Services Industry [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Assets measured at fair value, Available for sale equity securities	1,204	2,061
Insurance Services Industry [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Assets measured at fair value, Available for sale equity securities	116	65
Collateralized Debt Obligations [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Assets measured at fair value, Available for sale debt securities	'	31,595
Trading Assets [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Derivative financial instruments	34,086	33,317
Not for Trading Assets [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Derivative financial instruments	542	0
Trading Liabilities [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Derivative financial instruments	34,013	33,236
Not for Trading Liabilities [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Derivative financial instruments	4,642	10,133
Level 1 [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Assets measured at fair value, Available for sale debt securities	'	0
Assets measured at fair value, Available for sale equity securities	203	649
Assets measured at fair value, Available for sale securities	203	649
Derivative financial instruments	'	0
Assets measured at fair value, Total	203	649
Liabilities measured at fair value, Total	'	0
Level 1 [Member] | U.S. Treasury [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Assets measured at fair value, Available for sale debt securities	'	'
Level 1 [Member] | U.S. Government-Sponsored Entities [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Assets measured at fair value, Available for sale debt securities	'	0
Level 1 [Member] | States of the U.S. and Political Subdivisions [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Assets measured at fair value, Available for sale debt securities	'	0
Level 1 [Member] | Other Securities [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Assets measured at fair value, Available for sale debt securities	'	0
Level 1 [Member] | Agency Mortgage-Backed Securities [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Assets measured at fair value, Available for sale debt securities	'	0
Level 1 [Member] | Agency Collateralized Mortgage Obligations [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Assets measured at fair value, Available for sale debt securities	'	0
Level 1 [Member] | Non-Agency Collateralized Mortgage Obligations [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Assets measured at fair value, Available for sale debt securities	'	0
Level 1 [Member] | Commercial Mortgage-Backed Securities [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Assets measured at fair value, Available for sale debt securities	'	'
Level 1 [Member] | Financial Services Industry [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Assets measured at fair value, Available for sale equity securities	87	584
Level 1 [Member] | Insurance Services Industry [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Assets measured at fair value, Available for sale equity securities	116	65
Level 1 [Member] | Collateralized Debt Obligations [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Assets measured at fair value, Available for sale debt securities	'	0
Level 1 [Member] | Trading Assets [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Derivative financial instruments	'	0
Level 1 [Member] | Not for Trading Assets [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Derivative financial instruments	'	0
Level 1 [Member] | Trading Liabilities [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Derivative financial instruments	'	0
Level 1 [Member] | Not for Trading Liabilities [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Derivative financial instruments	'	0
Level 2 [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Assets measured at fair value, Available for sale debt securities	1,436,881	1,106,185
Assets measured at fair value, Available for sale equity securities	667	1,067
Assets measured at fair value, Available for sale securities	1,437,558	1,107,252
Derivative financial instruments	34,628	33,317
Assets measured at fair value, Total	1,472,186	1,140,569
Derivative financial instruments	38,655	43,369
Liabilities measured at fair value, Total	38,655	43,369
Level 2 [Member] | U.S. Treasury [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Assets measured at fair value, Available for sale debt securities	29,534	'
Level 2 [Member] | U.S. Government-Sponsored Entities [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Assets measured at fair value, Available for sale debt securities	275,508	330,985
Level 2 [Member] | States of the U.S. and Political Subdivisions [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Assets measured at fair value, Available for sale debt securities	13,894	17,002
Level 2 [Member] | Other Securities [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Assets measured at fair value, Available for sale debt securities	16,478	16,100
Level 2 [Member] | Agency Mortgage-Backed Securities [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Assets measured at fair value, Available for sale debt securities	496,483	250,881
Level 2 [Member] | Agency Collateralized Mortgage Obligations [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Assets measured at fair value, Available for sale debt securities	596,935	491,199
Level 2 [Member] | Non-Agency Collateralized Mortgage Obligations [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Assets measured at fair value, Available for sale debt securities	13	18
Level 2 [Member] | Commercial Mortgage-Backed Securities [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Assets measured at fair value, Available for sale debt securities	8,036	'
Level 2 [Member] | Financial Services Industry [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Assets measured at fair value, Available for sale equity securities	667	1,067
Level 2 [Member] | Insurance Services Industry [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Assets measured at fair value, Available for sale equity securities	'	0
Level 2 [Member] | Collateralized Debt Obligations [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Assets measured at fair value, Available for sale debt securities	'	0
Level 2 [Member] | Trading Assets [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Derivative financial instruments	34,086	33,317
Level 2 [Member] | Not for Trading Assets [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Derivative financial instruments	542	0
Level 2 [Member] | Trading Liabilities [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Derivative financial instruments	34,013	33,236
Level 2 [Member] | Not for Trading Liabilities [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Derivative financial instruments	4,642	10,133
Level 3 [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Assets measured at fair value, Available for sale debt securities	1,534	33,339
Assets measured at fair value, Available for sale equity securities	440	410
Assets measured at fair value, Available for sale securities	1,974	33,749
Derivative financial instruments	'	0
Assets measured at fair value, Total	1,974	33,749
Liabilities measured at fair value, Total	'	0
Level 3 [Member] | U.S. Treasury [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Assets measured at fair value, Available for sale debt securities	'	'
Level 3 [Member] | U.S. Government-Sponsored Entities [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Assets measured at fair value, Available for sale debt securities	'	0
Level 3 [Member] | States of the U.S. and Political Subdivisions [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Assets measured at fair value, Available for sale debt securities	'	0
Level 3 [Member] | Other Securities [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Assets measured at fair value, Available for sale debt securities	'	0
Level 3 [Member] | Agency Mortgage-Backed Securities [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Assets measured at fair value, Available for sale debt securities	'	0
Level 3 [Member] | Agency Collateralized Mortgage Obligations [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Assets measured at fair value, Available for sale debt securities	'	0
Level 3 [Member] | Non-Agency Collateralized Mortgage Obligations [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Assets measured at fair value, Available for sale debt securities	1,534	1,744
Level 3 [Member] | Commercial Mortgage-Backed Securities [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Assets measured at fair value, Available for sale debt securities	'	'
Level 3 [Member] | Financial Services Industry [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Assets measured at fair value, Available for sale equity securities	440	410
Level 3 [Member] | Insurance Services Industry [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Assets measured at fair value, Available for sale equity securities	'	0
Level 3 [Member] | Collateralized Debt Obligations [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Assets measured at fair value, Available for sale debt securities	'	31,595
Level 3 [Member] | Trading Assets [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Derivative financial instruments	'	0
Level 3 [Member] | Not for Trading Assets [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Derivative financial instruments	'	0
Level 3 [Member] | Trading Liabilities [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Derivative financial instruments	'	0
Level 3 [Member] | Not for Trading Liabilities [Member]	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'
Derivative financial instruments	'	$0

Fair_Value_Measurements_Additi1

Fair Value Measurements - Additional Information about Assets Measured at Fair Value on Recurring Basis (Detail) (USD $)	9 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'
Balance at beginning of period	$33,749	$32,565
Total gains (losses) - realized/unrealized, Included in earnings	13,766	78
Total gains (losses) - realized/unrealized, Included in other comprehensive income	5,642	6,705
Accretion included in earnings	660	3,176
Purchases	'	'
Issuances	'	38
Sales/redemptions	-51,527	-1,033
Settlements	-316	-1,698
Transfers from Level 3	'	-6,082
Transfers into Level 3	'	'
Balance at end of period	1,974	33,749
Pooled Trust Preferred Collateralized Debt Obligations [Member]	'	'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'
Balance at beginning of period	31,595	22,456
Total gains (losses) - realized/unrealized, Included in earnings	13,766	'
Total gains (losses) - realized/unrealized, Included in other comprehensive income	5,608	6,701
Accretion included in earnings	657	3,160
Purchases	'	'
Issuances	'	38
Sales/redemptions	-51,527	'
Settlements	-99	-760
Transfers from Level 3	'	'
Transfers into Level 3	'	'
Balance at end of period	'	31,595
Other Securities [Member]	'	'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'
Balance at beginning of period	'	6,892
Total gains (losses) - realized/unrealized, Included in earnings	'	78
Total gains (losses) - realized/unrealized, Included in other comprehensive income	'	21
Accretion included in earnings	'	4
Purchases	'	'
Issuances	'	'
Sales/redemptions	'	-1,033
Settlements	'	'
Transfers from Level 3	'	-5,962
Transfers into Level 3	'	'
Balance at end of period	'	'
Equity Securities [Member]	'	'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'
Balance at beginning of period	410	512
Total gains (losses) - realized/unrealized, Included in earnings	'	'
Total gains (losses) - realized/unrealized, Included in other comprehensive income	30	18
Accretion included in earnings	'	'
Purchases	'	'
Issuances	'	'
Sales/redemptions	'	'
Settlements	'	'
Transfers from Level 3	'	-120
Transfers into Level 3	'	'
Balance at end of period	440	410
Residential Non-Agency Collateralized Mortgage Obligations [Member]	'	'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'
Balance at beginning of period	1,744	2,705
Total gains (losses) - realized/unrealized, Included in earnings	'	'
Total gains (losses) - realized/unrealized, Included in other comprehensive income	4	-35
Accretion included in earnings	3	12
Purchases	'	'
Issuances	'	'
Sales/redemptions	'	'
Settlements	-217	-938
Transfers from Level 3	'	'
Transfers into Level 3	'	'
Balance at end of period	$1,534	$1,744

Fair_Value_Measurements_Additi2

Fair Value Measurements - Additional Information about Assets Measured at Fair Value on Non-Recurring Basis (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]	'	'
Impaired loans	$12,117	$3,294
Other real estate owned	6,206	19,442
Level 1 [Member]	'	'
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]	'	'
Impaired loans	'	'
Other real estate owned	'	'
Level 2 [Member]	'	'
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]	'	'
Impaired loans	10,724	3,235
Other real estate owned	3,801	4,485
Level 3 [Member]	'	'
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]	'	'
Impaired loans	1,393	59
Other real estate owned	$2,405	$14,957

Fair_Value_Measurements_Fair_V

Fair Value Measurements - Fair Values of Corporation's Financial Instruments (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'	'
Cash and cash equivalents	$237,968	$213,981	$283,509	$239,044
Securities available for sale	1,439,735	1,141,650	'	'
Securities held to maturity	1,475,552	1,199,169	'	'
Securities held to maturity	1,480,229	1,189,563	'	'
Bank owned life insurance	299,828	289,402	'	'
Derivative assets	34,628	33,317	'	'
Deposits	11,452,093	10,198,232	'	'
Short-term borrowings	1,601,167	1,241,239	'	'
Long-term debt	483,189	143,928	'	'
Junior subordinated debt	58,233	75,205	'	'
Derivative liabilities	38,655	43,369	'	'
Fair Value [Member]	'	'	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'	'
Cash and cash equivalents	237,968	213,981	'	'
Securities available for sale	1,439,735	1,141,650	'	'
Securities held to maturity	1,480,229	1,189,563	'	'
Net loans, including loans held for sale	10,709,224	9,243,780	'	'
Bank owned life insurance	305,149	292,694	'	'
Derivative assets	34,628	33,317	'	'
Accrued interest receivable	39,609	35,520	'	'
Deposits	11,455,085	10,208,268	'	'
Short-term borrowings	1,601,167	1,241,239	'	'
Long-term debt	484,900	145,995	'	'
Junior subordinated debt	58,225	70,442	'	'
Derivative liabilities	38,655	43,369	'	'
Accrued interest payable	6,507	7,061	'	'
Carrying Amount [Member]	'	'	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'	'
Cash and cash equivalents	237,968	213,981	'	'
Securities available for sale	1,439,735	1,141,650	'	'
Securities held to maturity	1,475,552	1,199,169	'	'
Net loans, including loans held for sale	10,851,690	9,402,448	'	'
Bank owned life insurance	299,828	289,402	'	'
Derivative assets	34,628	33,317	'	'
Accrued interest receivable	39,609	35,520	'	'
Deposits	11,452,093	10,198,232	'	'
Short-term borrowings	1,601,167	1,241,239	'	'
Long-term debt	483,189	143,928	'	'
Junior subordinated debt	58,233	75,205	'	'
Derivative liabilities	38,655	43,369	'	'
Accrued interest payable	6,507	7,061	'	'
Level 1 [Member]	'	'	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'	'
Cash and cash equivalents	237,968	213,981	'	'
Securities available for sale	203	649	'	'
Bank owned life insurance	305,149	292,694	'	'
Derivative assets	'	0	'	'
Accrued interest receivable	39,609	35,520	'	'
Deposits	8,772,509	7,592,159	'	'
Short-term borrowings	1,601,167	1,241,239	'	'
Accrued interest payable	6,507	7,061	'	'
Level 2 [Member]	'	'	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'	'
Securities available for sale	1,437,558	1,107,252	'	'
Securities held to maturity	1,475,584	1,182,671	'	'
Derivative assets	34,628	33,317	'	'
Deposits	2,682,576	2,616,109	'	'
Derivative liabilities	38,655	43,369	'	'
Level 3 [Member]	'	'	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'	'
Securities available for sale	1,974	33,749	'	'
Securities held to maturity	4,645	6,892	'	'
Net loans, including loans held for sale	10,709,224	9,243,780	'	'
Derivative assets	'	0	'	'
Long-term debt	484,900	145,995	'	'
Junior subordinated debt	$58,225	$70,442	'	'