F.N.B. (FNB) 10-K 28 Feb 14 2013 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
	Dec. 31, 2013	Feb. 18, 2014	Jun. 30, 2013
Document And Entity Information [Abstract]	'	'	'
Document Type	'10-K	'	'
Amendment Flag	'false	'	'
Document Period End Date	31-Dec-13	'	'
Document Fiscal Year Focus	'2013	'	'
Document Fiscal Period Focus	'FY	'	'
Trading Symbol	'FNB	'	'
Entity Registrant Name	'FNB CORP/FL/	'	'
Entity Central Index Key	'0000037808	'	'
Current Fiscal Year End Date	'--12-31	'	'
Entity Well-known Seasoned Issuer	'Yes	'	'
Entity Current Reporting Status	'Yes	'	'
Entity Voluntary Filers	'No	'	'
Entity Filer Category	'Large Accelerated Filer	'	'
Entity Common Stock, Shares Outstanding	'	165,681,400	'
Entity Public Float	'	'	$1,663,448,797

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Assets	'	'
Cash and due from banks	$197,534	$216,233
Interest bearing deposits with banks	16,447	22,811
Cash and Cash Equivalents	213,981	239,044
Securities available for sale	1,141,650	1,172,683
Securities held to maturity (fair value of $1,189,563 and $1,143,213)	1,199,169	1,106,563
Residential mortgage loans held for sale	7,138	27,751
Loans, net of unearned income of $55,051 and $51,661	9,506,094	8,137,719
Allowance for loan losses	-110,784	-104,374
Net Loans	9,395,310	8,033,345
Premises and equipment, net	154,032	140,367
Goodwill	764,248	675,555
Core deposit and other intangible assets, net	47,608	37,851
Bank owned life insurance	289,402	246,088
Other assets	350,867	344,729
Total Assets	13,563,405	12,023,976
Liabilities	'	'
Non-interest bearing demand	2,200,081	1,738,195
Savings and NOW	5,392,078	4,808,121
Certificates and other time deposits	2,606,073	2,535,858
Total Deposits	10,198,232	9,082,174
Other liabilities	130,418	163,151
Short-term borrowings	1,241,239	1,083,138
Long-term debt	143,928	89,425
Junior subordinated debt	75,205	204,019
Total Liabilities	11,789,022	10,621,907
Stockholders' Equity	'	'
Preferred stock - $0.01 par value Authorized - 20,000,000 shares Issued - 110,877 and 0 shares	106,882	'
Common stock - $0.01 par value Authorized - 500,000,000 shares Issued - 159,624,796 and 140,314,846 shares	1,592	1,398
Additional paid-in capital	1,608,117	1,376,601
Retained earnings	121,870	75,312
Accumulated other comprehensive loss	-56,924	-46,224
Treasury stock - 657,585 and 385,604 shares at cost	-7,154	-5,018
Total Stockholders' Equity	1,774,383	1,402,069
Total Liabilities and Stockholders' Equity	$13,563,405	$12,023,976

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, except Share data, unless otherwise specified
Statement Of Financial Position [Abstract]	'	'
Securities held to maturity, fair value	$1,189,563	$1,143,213
Unearned income on loans	$55,051	$51,661
Preferred stock, par value	$0.01	$0.01
Preferred stock, shares authorized	20,000,000	20,000,000
Preferred stock, shares issued	110,877	0
Common stock, par value	$0.01	$0.01
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	159,624,796	140,314,846
Treasury stock, shares	657,585	385,604

Consolidated_Statements_of_Inc

Consolidated Statements of Income (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Interest Income	'	'	'
Loans, including fees	$390,983	$377,802	$341,268
Securities:	'	'	'
Taxable	43,504	46,839	41,956
Nontaxable	5,667	6,680	7,469
Dividends	103	375	157
Other	129	210	275
Total Interest Income	440,386	431,906	391,125
Interest Expense	'	'	'
Deposits	29,441	42,513	53,535
Short-term borrowings	4,423	5,162	6,711
Long-term debt	3,115	3,492	6,403
Junior subordinated debt	7,365	7,888	7,968
Total Interest Expense	44,344	59,055	74,617
Net Interest Income	396,042	372,851	316,508
Provision for loan losses	31,090	31,302	33,641
Net Interest Income After Provision for Loan Losses	364,952	341,549	282,867
Non-Interest Income	'	'	'
Impairment losses on securities	-27	-626	-895
Non-credit related losses on securities not expected to be sold (recognized in other comprehensive income)	'	414	829
Net impairment losses on securities	-27	-212	-66
Service charges	68,221	69,546	61,358
Trust	16,751	15,239	14,782
Insurance commissions and fees	16,598	16,426	15,185
Securities commissions and fees	11,286	8,395	7,562
Bank owned life insurance	6,874	6,485	5,191
Mortgage banking	3,452	4,153	3,101
Gain on sale of securities	808	305	3,652
Other	11,815	10,915	8,965
Total Non-Interest Income	135,778	131,252	119,730
Non-Interest Expense	'	'	'
Salaries and employee benefits	179,971	168,219	149,817
Net occupancy	26,474	24,578	21,805
Equipment	25,214	22,320	19,033
Amortization of intangibles	8,407	8,924	7,040
Outside services	30,257	28,038	21,840
FDIC insurance	10,192	8,077	8,025
Supplies	6,887	6,441	4,938
State taxes	4,256	6,162	6,975
Telephone	5,063	5,697	4,957
Advertising and promotional	6,349	4,991	6,375
Loan related	3,945	3,363	5,353
Other real estate owned	3,215	3,268	5,218
Merger related	8,210	7,394	4,982
Other	19,730	21,146	17,188
Total Non-Interest Expense	338,170	318,618	283,546
Income Before Income Taxes	162,560	154,183	119,051
Income taxes	44,756	43,773	32,004
Net Income	117,804	110,410	87,047
Preferred stock dividends	'	'	'
Net Income Available to Common Stockholders	$117,804	$110,410	$87,047
Net Income per Common Share	'	'	'
Basic	$0.81	$0.79	$0.70
Diluted	$0.80	$0.79	$0.70
Cash Dividends Paid per Common Share	$0.48	$0.48	$0.48

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement Of Income And Comprehensive Income [Abstract]	'	'	'
Net income	$117,804	$110,410	$87,047
Unrealized (losses) gains on securities:	'	'	'
Arising during the period, net of tax (benefit) expense of $(10,121), $2,760 and $1,467	-18,796	5,125	2,725
Less: reclassification adjustment for gains included in net income, net of tax expense of $269, $216 and $1,257	-500	-400	-2,334
Unrealized losses on derivative instruments, net of tax benefit of $3,454 and $92	-6,415	-171	'
Unrealized gains (losses) associated with pension and postretirement benefits, net of tax expense (benefit) of $8,083, $(3,031) and $(6,358)	15,011	-5,630	-11,807
Other comprehensive loss	-10,700	-1,076	-11,416
Comprehensive income	$107,104	$109,334	$75,631

Consolidated_Statements_of_Com1

Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement Of Income And Comprehensive Income [Abstract]	'	'	'
Unrealized gains (losses) on securities, Arising during the period tax expense	($10,121)	$2,760	$1,467
Unrealized gains (losses) on securities, Reclassification adjustment for gains included in net income, tax expense	269	216	1,257
Unrealized losses on derivative instruments, tax benefit	3,454	92	'
Unrealized losses associated with pension and post retirement benefit, tax benefit	$8,083	($3,031)	($6,358)

Consolidated_Statements_of_Sto

Consolidated Statements of Stockholders' Equity (USD $)	Total	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Treasury Stock [Member]
In Thousands
Balance at Jan. 02, 2011	$1,066,124	'	$1,143	$1,094,713	$6,564	($33,732)	($2,564)
Net income	87,047	'	'	'	87,047	'	'
Change in other comprehensive income (loss), net of tax	-11,416	'	'	'	'	-11,416	'
Common dividends declared: $0.48/share	-60,686	'	'	'	-60,686	'	'
Issuance of common stock	124,378	'	125	125,107	'	'	-854
Restricted stock compensation	4,813	'	'	4,813	'	'	'
Tax benefit of stock-based compensation	-61	'	'	-61	'	'	'
Balance at Dec. 31, 2011	1,210,199	'	1,268	1,224,572	32,925	-45,148	-3,418
Net income	110,410	'	'	'	110,410	'	'
Change in other comprehensive income (loss), net of tax	-1,076	'	'	'	'	-1,076	'
Common dividends declared: $0.48/share	-67,646	'	'	'	-67,646	'	'
Issuance of common stock	146,038	'	130	147,885	-377	'	-1,600
Restricted stock compensation	3,758	'	'	3,758	'	'	'
Tax benefit of stock-based compensation	386	'	'	386	'	'	'
Balance at Dec. 31, 2012	1,402,069	'	1,398	1,376,601	75,312	-46,224	-5,018
Net income	117,804	'	'	'	117,804	'	'
Change in other comprehensive income (loss), net of tax	-10,700	'	'	'	'	-10,700	'
Common dividends declared: $0.48/share	-71,246	'	'	'	-71,246	'	'
Issuance of preferred stock	106,882	106,882	'	'	'	'	'
Issuance of common stock	223,006	'	194	224,948	'	'	-2,136
Restricted stock compensation	5,242	'	'	5,242	'	'	'
Tax benefit of stock-based compensation	1,326	'	'	1,326	'	'	'
Balance at Dec. 31, 2013	$1,774,383	$106,882	$1,592	$1,608,117	$121,870	($56,924)	($7,154)

Consolidated_Statements_of_Sto1

Consolidated Statements of Stockholders' Equity (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement Of Stockholders Equity [Abstract]	'	'	'
Common stock dividends per share	$0.48	$0.48	$0.48

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating Activities	'	'	'
Net income	$117,804	$110,410	$87,047
Adjustments to reconcile net income to net cash flows provided by operating activities:	'	'	'
Depreciation, amortization and accretion	70,759	31,827	22,427
Provision for loan losses	31,090	31,302	33,641
Deferred tax expenses	15,291	29,251	7,063
Net securities gains	-808	-305	-3,652
Other-than-temporary impairment losses on securities	27	212	66
Tax (benefit) expense of stock-based compensation	-1,326	-386	61
Loans originated for sale	-219,324	-255,064	-166,104
Loans sold	243,782	245,474	167,298
Gain on sale of loans	-3,845	-3,887	-2,768
Net change in:	'	'	'
Interest receivable	-1,675	-1,569	1,416
Interest payable	-2,173	-3,925	-1,602
Trading securities	125,800	331,972	110,490
Bank owned life insurance	-3,598	-6,130	-842
Other, net	14,280	34,848	34,989
Net cash flows provided by operating activities	386,084	544,030	289,530
Investing Activities	'	'	'
Net increase in loans	-683,559	-409,590	-412,462
Securities available for sale:	'	'	'
Purchases	-375,222	-924,747	-429,831
Sales	22,047	87,101	101,973
Maturities	345,528	450,064	431,219
Securities held to maturity:	'	'	'
Purchases	-373,136	-526,252	-243,461
Sales	17,428	2,903	'
Maturities	285,765	340,401	262,307
Purchase of bank owned life insurance	-10,016	-25,032	-34
Withdrawal/surrender of bank owned life insurance	'	20,891	'
Increase in premises and equipment	-14,882	-12,780	-17,115
Net cash received in business combinations	141,637	203,538	23,374
Net cash flows used in investing activities	-644,410	-793,503	-284,030
Financing Activities	'	'	'
Non-interest bearing deposits, savings, and NOW accounts	458,153	614,100	298,833
Time deposits	-312,242	-337,822	-196,520
Short-term borrowings	143,703	218,904	72,580
Increase in long-term debt	92,583	40,315	52,827
Decrease in long-term debt	-113,967	-197,568	-166,144
Decrease in junior subordinated debt	-134,021	'	'
Net proceeds from issuance of preferred stock	106,882	'	'
Net proceeds from issuance of common stock	62,092	8,895	71,053
Tax benefit (expense) of stock-based compensation	1,326	386	-61
Cash dividends paid	-71,246	-67,646	-60,686
Net cash flows (used in) provided by financing activities	233,263	279,564	71,882
Net Increase (Decrease) in Cash and Cash Equivalents	-25,063	30,091	77,382
Cash and cash equivalents at beginning of year	239,044	208,953	131,571
Cash and Cash Equivalents at End of Year	$213,981	$239,044	$208,953

Summary_of_Significant_Account

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2013
Accounting Policies [Abstract]	'
Summary of Significant Accounting Policies	'
	1.    Summary of Significant Accounting Policies
	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, F.N.B. Capital Corporation, LLC 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).
	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.
	Business Combinations
	Business combinations are accounted for by applying the acquisition method in accordance with Accounting Standards Codification (ASC) 805, Business Combinations. Under the acquisition method, identifiable assets acquired and liabilities assumed, and any non-controlling interest in the acquiree at the acquisition date are measured at their fair values as of that date, and are recognized separately from goodwill. Results of operations of the acquired entities are included in the consolidated statement of income from the date of acquisition.
	Cash Equivalents
	The Corporation considers cash and demand balances due from banks as cash and cash equivalents.
	Securities
	Investment securities, which consist of debt securities and certain equity securities, comprise a significant portion of the Corporation’s consolidated balance sheet. Such securities can be classified as “trading,” “securities held to maturity” or “securities available for sale.”
	Securities are classified as trading securities when management intends to sell such securities in the near term and are carried at fair value, with unrealized gains (losses) reflected through the consolidated statement of income. The Corporation acquired securities in conjunction with acquisitions during 2013 and 2012 that the Corporation classified as trading securities. The Corporation both acquired and sold these trading securities during the quarters in which each of the acquisitions occurred. As of December 31, 2013 and 2012, the Corporation did not hold any trading securities.
	Securities held to maturity are comprised of debt securities, for which management has the positive intent and ability to hold such securities until their maturity. Such securities are carried at cost, adjusted for related amortization of premiums and accretion of discounts through interest income from securities, and other-than-temporary impairment (OTTI), if any.
	Securities that are not classified as trading or held to maturity are classified as available for sale. The Corporation’s available for sale securities portfolio is comprised of debt securities and marketable equity securities. Such securities are carried at fair value with net unrealized gains and losses deemed to be temporary and unrealized losses deemed to be other-than-temporary and attributable to non-credit factors reported separately as a component of other comprehensive income, net of tax. Realized gains and losses on the sale of available for sale securities and credit-related OTTI charges are recorded within non-interest income in the consolidated statement of income. Realized gains and losses on the sale of securities are determined using the specific-identification method.
	The Corporation evaluates its investment securities portfolio for 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.
	When impairment of an equity security is considered to be other-than-temporary, the security is written down to its fair value and an impairment loss is recorded as a loss within non-interest income in the consolidated statement of income. When impairment of a debt security is considered to be other-than-temporary, the amount of the OTTI recorded as a loss within non-interest income and thereby recognized in earnings depends on whether the Corporation intends to sell the security or whether it is more likely than not that the Corporation will be required to sell the security before recovery of its amortized cost basis.
	If the Corporation intends to sell the debt security or more likely than not will be required to sell the security before recovery of its amortized cost basis, OTTI shall be recognized in earnings equal to the entire difference between the investment’s amortized cost basis and its fair value.
	If the Corporation does not intend to sell the debt security and it is not more likely than not the Corporation will be required to sell the security before recovery of its amortized cost basis, OTTI shall be separated into the amount representing credit loss and the amount related to all other market factors. The amount related to credit loss shall be recognized in earnings. The amount related to other market factors shall be recognized in other comprehensive income, net of applicable taxes.
	The Corporation performs its OTTI evaluation process in a consistent and systematic manner and includes an evaluation of all available evidence. Documentation of the process is as extensive as necessary to support a conclusion as to whether a decline in fair value below cost or amortized cost is temporary or other-than-temporary and includes documentation supporting both observable and unobservable inputs and a rationale for conclusions reached. In making these determinations for pooled trust preferred securities (TPS), the Corporation consults with third-party advisory firms to provide additional valuation assistance.
	This process considers factors such as the severity, length of time and anticipated recovery period of the impairment, recoveries or additional declines in fair value subsequent to the balance sheet date, recent events specific to the issuer, including investment downgrades by rating agencies and economic conditions in its industry, and the issuer’s financial condition, repayment capacity, capital strength and near-term prospects.
	For debt securities, the Corporation also considers the payment structure of the debt security, the likelihood of the issuer being able to make future payments, failure of the issuer of the security to make scheduled interest and principal payments, whether the Corporation has made a decision to sell the security and whether the Corporation’s cash or working capital requirements or contractual or regulatory obligations indicate that the debt security will be required to be sold before a forecasted recovery occurs. For equity securities, the Corporation also considers its intent and ability to retain the security for a period of time sufficient to allow for a recovery in fair value. Among the factors that the Corporation considers in determining its intent and ability to retain the security is a review of its capital adequacy, interest rate risk position and liquidity. The assessment of a security’s ability to recover any decline in fair value, the ability of the issuer to meet contractual obligations, the Corporation’s intent and ability to retain the security, and whether it is more likely than not the Corporation will be required to sell the security before recovery of its amortized cost basis require considerable judgment.
	Debt securities with credit ratings below AA at the time of purchase that are repayment-sensitive securities are evaluated using the guidance of ASC 325, Investments – Other. All other securities are required to be evaluated under ASC 320, Investments – Debt Securities.
	Securities Sold Under Agreements to Repurchase
	Securities sold under agreements to repurchase are accounted for as collateralized financing transactions and are recorded at the amounts at which the securities were sold plus accrued interest. Securities, generally U.S. government and federal agency securities, pledged as collateral under these financing arrangements cannot be sold or repledged by the secured party. The fair value of collateral either received from or provided to a third party is continually monitored and additional collateral is obtained or is requested to be returned to the Corporation as deemed appropriate.
	Derivative Instruments and Hedging Activities
	From time to time, the Corporation may enter into derivative transactions principally to protect against the risk of adverse price or interest rate movements on the value of certain assets and liabilities and on future cash flows. The Corporation formally documents all relationships between hedging instruments and hedged items, as well as its risk management objective and strategy for undertaking each hedge transaction. All derivative instruments are carried at fair value on the balance sheet in accordance with the requirements of ASC 815, Derivatives and Hedging.
	Cash flow hedges are accounted for by recording the fair value of the derivative instrument on the balance sheet as either a freestanding asset or liability, with a corresponding offset recorded in accumulated other comprehensive income, net of tax. Amounts are reclassified from accumulated other comprehensive income to the consolidated statement of income in the period or periods in which the hedged transaction affects earnings.
	Derivative gains and losses under cash flow hedges not effective in hedging the change in fair value or expected cash flows of the hedged item are recognized immediately in the consolidated statement of income. At the hedge’s inception and at least quarterly thereafter, a formal assessment is performed to determine whether changes in the fair values or cash flows of the derivative instruments have been highly effective in offsetting changes in fair values or cash flows of the hedged items and whether they are expected to be highly effective in the future. If it is determined a derivative instrument has not been or will not continue to be highly effective as a hedge, hedge accounting is discontinued.
	In addition, 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. 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.
	Mortgage Loans Held for Sale and Loan Commitments
	Certain residential mortgage loans are originated for sale in the secondary mortgage loan market and typically sold with servicing rights released. These loans are classified as loans held for sale and are carried at the lower of cost or estimated market value on an aggregate basis. Market value is determined on the basis of rates obtained in the respective secondary market for the type of loan held for sale. Loans are generally sold at a premium or discount from the carrying amount of the loan. Such premium or discount is recognized at the date of sale. Gain or loss on the sale of loans is recorded in non-interest income at the time consideration is received and all other criteria for sales treatment have been met.
	The Corporation routinely issues commitments to make loans that it intends to sell. These commitments are considered derivatives. The Corporation also enters into commitments to sell loans to mitigate the risk that the market value of residential loans may decline between the time the rate commitment is issued to the customer and the time the Corporation contracts to sell the loan. These commitments and sales contracts are also derivatives. Both types of derivatives are recorded at fair value. Sales contracts and commitments to sell loans are not designated as hedges of the fair value of loans held for sale. Fair value adjustments related to derivatives are recorded in current period earnings as part of mortgage banking income.
	Loans (Excluding Acquired Loans)
	Loans the Corporation originates and intends to hold for the foreseeable future or until maturity or payoff are reported at their net book balances, net of any deferred origination fees or costs. Interest income on loans is computed over the term of the loans using the effective interest method. Loan origination fees and certain direct costs incurred to extend credit are deferred and amortized over the term of the loan or loan commitment period as an adjustment to the related loan yield.
	Non-performing Loans
	Interest is not accrued on loans where collectibility is uncertain. The Corporation 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. Past due status is based on the contractual terms of the loan.
	When a loan is placed on non-accrual status, all unpaid interest is reversed. Payments subsequently received are generally applied to either principal or interest or both, depending on management’s evaluation of collectibility. A loan is returned to accrual status when principal and interest are no longer past due and collectibility is probable. This generally requires a sustained period of timely principal and interest payments.
	Loans are generally written off when deemed uncollectible or when they reach a predetermined number of days past due depending upon loan product, terms, and other factors. Recoveries of amounts previously charged off are credited to the allowance for loan losses.
	The Corporation considers a loan impaired when, based on current information and events, it is probable that the Corporation will be unable to collect the scheduled payments of principal or interest when due according to the contractual terms of the loan agreement. Factors considered in determining impairment include payment status, collateral value and the probability of collecting scheduled principal and interest payments when due. The impairment loss is measured by either the present value of expected future cash flows discounted at the loan’s effective interest rate, the loan’s obtainable market price, or the fair value of the collateral, less estimated selling costs, if the loan is collateral dependent. Acquired impaired loans are not classified as non-performing assets as the loans are considered to be performing under the provisions of ASC 310-30,Loans and Debt Securities Acquired with Deteriorated Credit Quality.
	Restructured loans are those in which concessions of terms have been made as a result of deterioration in a borrower’s financial condition. In general, the modification or restructuring of a debt constitutes a troubled debt restructuring (TDR) if the Corporation for economic or legal reasons related to the borrower’s financial difficulties grants a concession to the borrower that the Corporation would not otherwise consider under current market conditions. Debt restructurings or loan modifications for a borrower occur during the normal course of business and do not necessarily constitute TDRs. To designate a loan as a TDR, the presence of both borrower financial distress and a concession of terms must exist. Additionally, a loan designated as a TDR does not necessarily result in the automatic placement of the loan on non-accrual status. When the full collection of principal and interest is reasonably assured on a loan designated as a TDR and the borrower does not otherwise meet the criteria for non-accrual status, the Corporation will continue to accrue interest on the loan.
	In accordance with ASC 310-40, a restructured acquired loan that is accounted for as a component of a pool in accordance with ASC 310-30 is not considered a TDR.
	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 uncollectibility of a loan balance is confirmed. Subsequent recoveries, if any, are credited to the allowance for loan losses. Allowances for impaired loans are generally determined based on collateral values or the present value of estimated cash flows. 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 historical loss experience and consideration of current environmental factors and economic trends, 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.
	Acquired Loans
	Acquired loans (impaired and non-impaired) are initially recorded at their acquisition-date fair values. Fair values are based on a discounted cash flow methodology that involves assumptions and judgments as to credit risk, default rates, loss severity, collateral values, discount rates, payment speeds, prepayment risk, and liquidity risk.
	The carryover of allowance for loan losses related to acquired loans is prohibited as any credit losses in the loans are included in the determination of the fair value of the loans at the acquisition date. The allowance for loan losses on acquired loans reflects only those losses incurred after acquisition and represents the present value of cash flows expected at acquisition that is no longer expected to be collected.
	At acquisition, the Corporation considers the following factors as indicators that an acquired loan has evidence of deterioration in credit quality and is therefore impaired and in the scope of ASC 310-30:
		•	loans that were 90 days or more past due;
		•	loans that had an internal risk rating of substandard or worse. Substandard is consistent with regulatory definitions and is defined as having a well-defined weakness that jeopardizes liquidation of the loan;
		•	loans that were classified as non-accrual by the acquired bank at the time of acquisition; or
		•	loans that had been previously modified in a TDR.
	Any acquired loans that were not individually in the scope of ASC 310-30 because they didn’t meet the criteria above were pooled into groups of similar loans based on various factors including borrower type, loan purpose, and collateral type. For these pools, the Corporation used certain loan information, including outstanding principal balance, estimated expected losses, weighted average maturity, weighted average margin, and weighted average interest rate along with estimated prepayment rates, probability of default and loss given default to estimate the expected cash flow for each loan pool.
	Pursuant to an American Institute of CPAs (AICPA) letter dated December 18, 2009, the AICPA summarized the SEC staff’s view regarding accounting in subsequent periods for discount accretion associated with acquired loan receivables that are not required to be accounted for in accordance with ASC 310-30. The AICPA understands that, in the absence of further standard setting, the SEC staff would not object to an accounting policy based on contractual cash flows (ASC 310-20 approach) or an accounting policy based on expected cash flows (ASC 310-30 approach). The Corporation believes analogizing to ASC 310-30 is the more appropriate option to follow in accounting for discount accretion on non-impaired acquired loans other than revolving loans and therefore accounts for such loans in accordance with ASC 310-30. ASC 310-30 guidance does not apply to revolving loans. Consequently, discount accretion on revolving loans acquired is accounted for using the ASC 310-20 approach.
	The excess of cash flows expected to be collected at acquisition over recorded fair value is referred to as the accretable yield. The accretable yield is recognized into income over the remaining life of the loan if the timing and/or amount of cash flows expected to be collected can be reasonably estimated (the accretion model). If the timing and/or amount of cash flows expected to be collected cannot be reasonably estimated, the cost recovery method of income recognition must be used. The difference between the loan’s total scheduled principal and interest payments over all cash flows expected at acquisition is referred to as the non-accretable difference. The non-accretable difference represents contractually required principal and interest payments which the Corporation does not expect to collect.
	Over the life of the acquired loan, the Corporation continues to estimate cash flows expected to be collected. Decreases in expected cash flows, other than from prepayments or rate adjustments, are recognized as impairments through a charge to the provision for loan losses resulting in an increase in the allowance for loan losses. Subsequent improvements in cash flows result in first, reversal of existing valuation allowances recognized subsequent to acquisition, if any, and next, an increase in the amount of accretable yield to be subsequently recognized on a prospective basis over the loan’s remaining life.
	Acquired loans that met the criteria for non-accrual of interest prior to acquisition are considered performing upon acquisition, regardless of whether the customer is contractually delinquent, if the Corporation can reasonably estimate the timing and amount of expected cash flows on such loans. Accordingly, the Corporation does not consider acquired contractually delinquent loans to be non-accrual or non-performing and continues to recognize interest income on these loans using the accretion model.
	Premises and Equipment
	Premises and equipment are stated at cost less accumulated depreciation. Depreciation is computed using the straight-line method over the asset’s estimated useful life. Leasehold improvements are expensed over the lesser of the asset’s estimated useful life or the term of the lease including renewal periods when reasonably assured. Useful lives are dependent upon the nature and condition of the asset and range from 3 to 40 years. Maintenance and repairs are charged to expense as incurred, while major improvements are capitalized and amortized to operating expense over the identified useful life.
	Other Real Estate Owned
	Other real estate owned (OREO) is comprised principally of commercial and residential real estate properties obtained in partial or total satisfaction of loan obligations. OREO acquired in settlement of indebtedness is included in other assets initially at the lower of estimated fair value of the asset less estimated selling costs or the carrying amount of the loan. Changes to the value subsequent to transfer are recorded in non-interest expense along with direct operating expenses. Gains or losses not previously recognized resulting from sales of OREO are recognized in non-interest expense on the date of sale.
Goodwill and Other Intangible Assets
Goodwill represents the excess of the cost of an acquisition over the fair value of the net assets acquired. Other intangible assets represent purchased assets that lack physical substance but can be distinguished from goodwill because of contractual or other legal rights. Intangible assets that have finite lives, such as core deposit intangibles, customer relationship intangibles and renewal lists, are amortized over their estimated useful lives and subject to periodic impairment testing. Core deposit intangibles are primarily amortized over ten years using straight line and accelerated methods. Customer and renewal lists and other intangible assets are amortized over their estimated useful lives which range from ten to twelve years.
Goodwill and other intangibles are subject to impairment testing at the reporting unit level, which must be conducted at least annually. The Corporation performs impairment testing during the fourth quarter of each year. Due to ongoing uncertainty regarding market conditions surrounding the banking industry, the Corporation continues to monitor goodwill and other intangibles for impairment and to evaluate carrying amounts, as necessary.
The Corporation performs a qualitative assessment to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If, after assessing updated qualitative factors, the Corporation determines it is not more likely than not that the fair value of a reporting unit is less than its carrying amount, it does not have to perform the two-step goodwill impairment test. Determining the fair value of a reporting unit under the first step of the goodwill impairment test and determining the fair value of individual assets and liabilities of a reporting unit under the second step of the goodwill impairment test are judgmental and often involve the use of significant estimates and assumptions. Similarly, estimates and assumptions are used in determining the fair value of other intangible assets. Estimates of fair value are primarily determined using discounted cash flows, market comparisons and recent transactions. These approaches use significant estimates and assumptions including projected future cash flows, discount rates reflecting the market rate of return, projected growth rates and determination and evaluation of appropriate market comparables. Based on the results of quantitative assessments of all reporting units, the Corporation concluded that no impairment existed at December 31, 2013. However, future events could cause the Corporation to conclude that goodwill or other intangibles have become impaired, which would result in recording an impairment loss. Any resulting impairment loss could have a material adverse impact on the Corporation’s financial condition and results of operations.
Income Taxes
The Corporation files a consolidated federal income tax return. The provision for federal and state income taxes is based on income reported on the consolidated financial statements, rather than the amounts reported on the respective income tax returns. Deferred tax assets and liabilities are computed using tax rates expected to apply to taxable income in the years in which those assets and liabilities are expected to be realized. The effect on deferred tax assets and liabilities resulting from a change in tax rates is recognized as income or expense in the period that the change in tax rates is enacted.
The Corporation makes certain estimates and judgments in determining income tax expense for financial statement purposes. These estimates and judgments are applied in the calculation of certain tax credits and in the calculation of the deferred income tax expense or benefit associated with certain deferred tax assets and liabilities. Significant changes to these estimates may result in an increase or decrease to the Corporation’s tax provision in a subsequent period. The Corporation recognizes interest and/or penalties related to income tax matters in income tax expense.
The Corporation assesses the likelihood that it will be able to recover its deferred tax assets. If recovery is not likely, the Corporation will increase its provision for income taxes by recording a valuation allowance against the deferred tax assets that are unlikely to be recovered. The Corporation believes that it will ultimately recover a substantial majority of the deferred tax assets recorded on the balance sheet. However, should there be a change in the Corporation’s ability to recover its deferred tax assets, the effect of this change would be recorded through the provision for income taxes in the period during which such change occurs.
The Corporation periodically reviews the tax positions it takes on its tax return and applies a more likely than not recognition threshold for all tax positions that are uncertain. The amount recognized in the financial statements is the largest amount of tax benefit that is greater than 50% likely of being realized on examination. For tax positions not meeting the more likely than not test, no tax benefit is recorded.
Advertising and Promotional Costs
Advertising and promotional costs are generally expensed as incurred.
Per Share Amounts
Earnings per common share is computed using net income available to common stockholders, which is net income adjusted for preferred stock dividends.
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 adjusted for interest expense on convertible debt 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 net income available to common stockholders and the weighted average number of shares of common stock outstanding are made only when such adjustments dilute earnings per common share.
Pension Plans
The Corporation sponsors pension plans for its employees. The expense associated with the plans is calculated in accordance with ASC 715, Compensation – Retirement Benefits. The plans utilize assumptions and methods determined in accordance with ASC 715, including reflecting trust assets at their fair value for the qualified pension plans and recognizing the overfunded and underfunded status of the plans on its consolidated balance sheet. Gains and losses, prior service costs and credits are recognized in accumulated other comprehensive income, net of tax, until they are amortized, or immediately upon curtailment.
Stock Based Compensation
The Corporation accounts for its stock based compensation awards in accordance with ASC 718, Compensation – Stock Compensation, which requires the measurement and recognition of compensation expense, based on estimated fair values, for all share-based awards, including stock options and restricted stock, made to employees and directors.
ASC 718 requires companies to estimate the fair value of share-based awards on the date of grant. The value of the portion of the award that is ultimately expected to vest is recognized as expense in the Corporation’s consolidated statement of income over the shorter of requisite service periods or the period through the date that the employee first becomes eligible to retire. Because share-based compensation expense is based on awards that are ultimately expected to vest, share-based compensation expense has been reduced to account for estimated forfeitures. Forfeitures are estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates.

New_Accounting_Standards

New Accounting Standards	12 Months Ended
	Dec. 31, 2013
Accounting Changes And Error Corrections [Abstract]	'
New Accounting Standards	'
	2.    New Accounting Standards
	Troubled Debt Restructurings
	In January 2014, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (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 OREO recognized. This update 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 is not expected to have a material effect on the financial statements, results of operations or liquidity of the Corporation.
	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. This update 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 is not expected to have a material effect on the financial statements, results of operations or liquidity of the Corporation.
	Derivatives and Hedging
	In July 2013, the FASB issued ASU No. 2013-10, Inclusion of the Fed Funds Effective Swap Rate (or Overnight Index Swap Rate) as a Benchmark Interest Rate for Hedge Accounting Purposes, which establishes the Fed Funds Effective Swap Rate as an acceptable U.S. benchmark interest rate, in addition to the U.S. Department of the Treasury (UST) and the London Interbank Offered Rate (LIBOR) swap rates, to provide risk managers with a more comprehensive spectrum of interest rate resets to utilize as the designated benchmark interest rate risk component under the hedge accounting guidance. The requirements of ASU 2013-10 were effective prospectively for qualifying new or redesignated hedging relationships entered into on or after July 17, 2013. The adoption of this update did not have a material effect on the financial statements, results of operations or liquidity of the Corporation.
	Comprehensive Income
	In February 2013, the FASB issued ASU No. 2013-02, Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income, that requires an entity to report the effects of significant reclassifications out of each component of accumulated other comprehensive income on the respective line item in net income if the amount being reclassified is required under GAAP to be reclassified to net income in its entirety in the same reporting period. For amounts not required to be reclassified in their entirety in the same reporting period, an entity shall add a cross reference to the related footnote where additional information about the effect of the reclassification is disclosed. The requirements of ASU 2013-02 were effective prospectively for reporting periods beginning after December 15, 2012. The adoption of this update did not have a material effect on the financial statements, results of operations or liquidity of the Corporation.
	Disclosures about Offsetting Assets and Liabilities
	In January 2013, the FASB issued ASU No. 2013-01, Scope Clarification of Disclosures about Offsetting Assets and Liabilities, that clarifies the scope of its previously issued guidance, limiting the disclosure requirements to derivative instruments, repurchase agreements and reverse repurchase agreements and securities borrowing and lending transactions to the extent that they are offset in the financial statements or subject to an enforceable master netting arrangement or similar agreement. The requirements of ASU 2013-01 were effective on January 1, 2013. The adoption of this update did not have a material effect on the financial statements, results of operations or liquidity of the Corporation.

Mergers_and_Acquisitions

Mergers and Acquisitions	12 Months Ended
	Dec. 31, 2013
Business Combinations [Abstract]	'
Mergers and Acquisitions	'
	3.    Mergers and Acquisitions
	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. As of December 31, 2013, BCSB had $605,901 in assets, $326,258 in loans and $531,563 in deposits. The acquisition was valued at approximately $81,205 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. BCSB’s banking affiliate, Baltimore County Savings Bank, was merged into FNBPA on February 15, 2014. The Corporation will finalize its determination of the fair values of acquired assets and liabilities relating to the BCSB acquisition in 2014.
	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 $738,486 in assets, $512,566 in loans and $627,046 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 balance sheet at their preliminary estimated 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 income and comprehensive income since that date. PVF’s banking affiliate, Park View Federal Savings Bank, was merged into FNBPA on October 12, 2013. Based on a preliminary purchase price allocation, the Corporation recorded $51,284 in goodwill and $6,867 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.
	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 $430,217 in assets, $256,199 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 balance sheet at their preliminary estimated 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 income and 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 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 a preliminary purchase price allocation, the Corporation has recorded $37,410 in goodwill and $3,775 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.
	Parkvale Financial Corporation
	On January 1, 2012, the Corporation completed its acquisition of Parkvale Financial Corporation (Parkvale), a unitary savings and loan holding company based in Monroeville, Pennsylvania. On the acquisition date, the fair values of Parkvale included $1,743,885 in assets, $919,480 in loans and $1,525,253 in deposits. The acquisition was valued at $140,900 and resulted in the Corporation issuing 12,159,312 shares of its common stock in exchange for 5,582,846 shares of Parkvale common stock. The Corporation also acquired the outstanding stock options of Parkvale that became fully vested upon the acquisition. The assets and liabilities of Parkvale were recorded on the Corporation’s balance sheet at their fair values as of January 1, 2012, the acquisition date, and Parkvale’s results of operations have been included in the Corporation’s consolidated statements of income and comprehensive income since that date. Parkvale’s banking affiliate, Parkvale Bank, was merged into FNBPA on January 1, 2012. The warrant issued by Parkvale to the UST under the CPP was assumed by the Corporation and converted into a warrant to purchase up to 819,640 shares of the Corporation’s common stock. The warrant expires December 23, 2018 and has an exercise price of $5.81. Based on the purchase price allocation, which was completed in the fourth quarter of 2012, the Corporation recorded $106,602 in goodwill and $16,033 in core deposit intangibles as a result of the acquisition. None of the goodwill is deductible for income tax purposes.
	The following table summarizes the amounts recorded on the consolidated balance sheet as of each of the acquisition dates in conjunction with the Parkvale, ANNB and PVF acquisitions:
		Parkvale		Annapolis		PVF
		Financial		Bancorp,		Capital
		Corporation		Inc.		Corp.
	Fair value of consideration paid:
	Common stock issued, net of offering costs	$	136,441	$	54,065	$	109,856
	Warrant assumed		4,459		2,235		—
	Total consideration paid		140,900		56,300		109,856
	Fair value of identifiable assets acquired:
	Cash and cash equivalents		203,538		41,986		99,650
	Securities		486,186		99,309		47,258
	Loans		919,480		256,199		512,566
	Other intangible assets		16,033		3,775		15,288
	Accrued income and other assets		118,648		28,948		63,724
	Total identifiable assets acquired		1,743,885		430,217		738,486
	Fair value of liabilities assumed:
	Deposits		1,525,253		349,370		627,046
	Borrowings		171,606		58,204		37,241
	Accrued expenses and other liabilities		12,728		3,753		15,627
	Total liabilities assumed		1,709,587		411,327		679,914
	Fair value of net identifiable assets acquired		34,298		18,890		58,572
	Goodwill recognized	$	106,602	$	37,410	$	51,284
	The following pro forma information for the year ended December 31, 2011 reflects the Corporation’s estimated consolidated results of operations as if the Parkvale acquisition occurred on January 1, 2011, unadjusted for potential cost savings:
	Year Ended December 31	2011
	Revenue (net interest income and non-interest income)	$	486,818
	Net income		96,299
	Net income available to common stockholders		94,711
	Earnings per common share – basic		0.69
	Earnings per common share – diluted		0.69
	Parkvale’s results of operations are included in the Corporation’s results for the entire years of 2013 and 2012. Pro forma information is not presented for 2013 or 2012 to reflect ANNB and PVF due to the immateriality of those acquisitions.

Securities

Securities	12 Months Ended
	Dec. 31, 2013
Text Block [Abstract]	'
Securities	'
	4.     Securities
	The amortized cost and fair value of securities are as follows:
			Amortized				Gross				Gross				Fair
			Cost				Unrealized				Unrealized				Value
							Gains				Losses
	Securities Available for Sale:
	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
	December 31, 2012
	U.S. government-sponsored entities		$	352,910			$	1,676			$	(129	)		$	354,457
	Residential mortgage-backed securities:
	Agency mortgage-backed securities			267,575				7,575				—				275,150
	Agency collateralized mortgage obligations			465,574				4,201				(228	)			469,547
	Non-agency collateralized mortgage obligations			2,679				50				—				2,729
	States of the U.S. and political subdivisions			23,592				1,232				—				24,824
	Collateralized debt obligations			34,765				967				(13,276	)			22,456
	Other debt securities			21,790				695				(972	)			21,513
	Total debt securities			1,168,885				16,396				(14,605	)			1,170,676
	Equity securities			1,554				462				(9	)			2,007
			$	1,170,439			$	16,858			$	(14,614	)		$	1,172,683
	December 31, 2011
	U.S. government-sponsored entities		$	231,187			$	642			$	—			$	231,829
	Residential mortgage-backed securities:
	Agency mortgage-backed securities			166,758				4,853				—				171,611
	Agency collateralized mortgage obligations			181,493				2,236				—				183,729
	Non-agency collateralized mortgage obligations			31				—				(1	)			30
	States of the U.S. and political subdivisions			38,509				1,841				—				40,350
	Collateralized debt obligations			19,224				—				(13,226	)			5,998
	Other debt securities			6,863				—				(1,666	)			5,197
	Total debt securities			644,065				9,572				(14,893	)			638,744
	Equity securities			1,593				257				(23	)			1,827
			$	645,658			$	9,829			$	(14,916	)		$	640,571
			Amortized				Gross				Gross				Fair
			Cost				Unrealized				Unrealized				Value
							Gains				Losses
	Securities Held to Maturity:
	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
	December 31, 2012
	U.S. Treasury		$	503			$	188			$	—			$	691
	U.S. government-sponsored entities			28,731				280				(99	)			28,912
	Residential mortgage-backed securities:
	Agency mortgage-backed securities			780,022				28,783				(1	)			808,804
	Agency collateralized mortgage obligations			133,976				1,266				—				135,242
	Non-agency collateralized mortgage obligations			14,082				130				—				14,212
Commercial mortgage-backed securities			1,024				39				—				1,063
States of the U.S. and political subdivisions			147,713				6,099				—				153,812
Collateralized debt obligations			512				—				(35	)			477
		$	1,106,563			$	36,785			$	(135	)		$	1,143,213
December 31, 2011
U.S. Treasury		$	504			$	185			$	—			$	689
U.S. government-sponsored entities			4,019				175				—				4,194
Residential mortgage-backed securities:
Agency mortgage-backed securities			683,100				28,722				—				711,822
Agency collateralized mortgage obligations			54,319				573				(11	)			54,881
Non-agency collateralized mortgage obligations			24,348				143				(1,373	)			23,118
States of the U.S. and political subdivisions			147,748				6,877				—				154,625
Collateralized debt obligations			1,592				—				(314	)			1,278
Other debt securities			1,582				25				(181	)			1,426
		$	917,212			$	36,700			$	(1,879	)		$	952,033
Gross gains and gross losses were realized on securities as follows:
Year Ended December 31		2013				2012				2011
Gross gains		$	1,200			$	1,154			$	3,848
Gross losses			(392	)			(849	)			(196	)
		$	808			$	305			$	3,652
The gross gains in the table above included $3,415 in 2011 relating to the sale of securities to better position the balance sheet. These sales included a $3,940 U.S. government agency security and $83,736 of mortgage backed securities.
As of December 31, 2013, 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		$	—			$	—			$	3,376			$	3,421
Due from one to five years			281,854				278,833				47,666				46,735
Due from five to ten years			79,155				77,071				51,161				51,798
Due after ten years			46,304				39,778				73,784				73,131
			407,313				395,682				175,987				175,085
Residential mortgage-backed securities:
Agency mortgage-backed securities			247,880				250,881				628,681				634,930
Agency collateralized mortgage obligations			511,098				491,199				385,408				370,328
Non-agency collateralized mortgage obligations			1,747				1,762				6,852				6,892
Commercial mortgage-backed securities			—				—				2,241				2,328
Equity securities			1,444				2,126				—				—
		$	1,169,482			$	1,141,650			$	1,199,169			$	1,189,563
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 residential mortgage-backed securities based on the payment patterns of the underlying collateral.
At December 31, 2013 and 2012, securities with a carrying value of $909,548 and $725,450, respectively, were pledged to secure public deposits, trust deposits and for other purposes as required by law. Securities with a carrying value of $860,279 and $795,812 at December 31, 2013 and 2012, 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												Greater than 12 Months										Total
		#				Fair				Unrealized				#				Fair			Unrealized			#		Fair		Unrealized
						Value				Losses								Value			Losses					Value		Losses
Securities Available for Sale:
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	)
December 31, 2012
U.S. government-sponsored entities			3			$	44,868			$	(129	)			—			$	—		$	—			3	$	44,868	$	(129	)
Residential mortgage-backed securities:
Agency collateralized mortgage obligations			3				47,174				(228	)			—				—			—			3		47,174		(228	)
Collateralized debt obligations			7				8,708				(909	)			9				5,532			(12,367	)		16		14,240		(13,276	)
Other debt securities			—				—				—				4				5,899			(972	)		4		5,899		(972	)
Equity securities			1				654				(9	)			—				—			—			1		654		(9	)
			14			$	101,404			$	(1,275	)			13			$	11,431		$	(13,339	)		27	$	112,835	$	(14,614	)
		Less than 12 Months												Greater than 12 Months										Total
		#				Fair Value				Unrealized				#				Fair			Unrealized			#		Fair Value		Unrealized
										Losses								Value			Losses							Losses
Securities Held to Maturity:
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	)
December 31, 2012
U.S. government-sponsored entities			1			$	14,901			$	(99	)			—			$	—		$	—			1	$	14,901	$	(99	)
Residential mortgage-backed securities:
Agency mortgage-backed securities			1				1,424				(1	)			—				—			—			1		1,424		(1	)
Collateralized debt obligations			—				—				—				1				477			(35	)		1		477		(35	)
			2			$	16,325			$	(100	)			1			$	477		$	(35	)		3	$	16,802	$	(135	)
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 collateralized debt obligations (CDOs) relate to investments in TPS. The Corporation’s portfolio of TPS consists of single-issuer and pooled securities. The single-issuer securities are primarily from money-center and large regional banks and are included in other debt securities. The pooled securities consist of securities issued primarily by banks and thrifts, with some of the pools including a limited number of insurance companies. One of the pooled securities is covered by the Volcker Rule and regulatory guidance issued in January 2014 requires its disposal by July 2015. This security was acquired in the Parkvale acquisition and valued at fair value and is not subject to OTTI. Investments in pooled securities are all in mezzanine tranches except for two investments in senior tranches, and are secured by over-collateralization or default protection provided by subordinated tranches. The non-credit portion of unrealized losses on investments in TPS is attributable to illiquidity and the uncertainty affecting these markets, as well as changes in interest rates.
Other-Than-Temporary Impairment
The Corporation evaluates its investment securities portfolio for 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 Corporation invested in TPS issued by special purpose vehicles (SPVs) that hold pools of collateral consisting of trust preferred and subordinated debt securities issued by banks, bank holding companies, thrifts and insurance companies. The securities issued by the SPVs are generally segregated into several classes known as tranches. Typically, the structure includes senior, mezzanine and equity tranches. The equity tranche represents the first loss position. The Corporation generally holds interests in mezzanine tranches. Interest and principal collected from the collateral held by the SPVs are distributed with a priority that provides the highest level of protection to the senior-most tranches. In order to provide a high level of protection to the senior tranches, cash flows are diverted to higher-level tranches if the principal and interest coverage tests are not met.
The Corporation prices its holdings of pooled TPS using Level 3 inputs in accordance with ASC 820, Fair Value Measurements and Disclosures, and guidance issued by the SEC. In this regard, the Corporation evaluates current available information in estimating the future cash flows of these securities and determines whether there have been favorable or adverse changes in estimated cash flows from the cash flows previously projected. The Corporation considers the structure and term of the pool and the financial condition of the underlying issuers. Specifically, the evaluation incorporates factors such as over-collateralization and interest coverage tests, interest rates and appropriate risk premiums, the timing and amount of interest and principal payments and the allocation of payments to the various tranches. Current estimates of cash flows are based on the most recent trustee reports, announcements of deferrals or defaults, and assumptions regarding expected future default rates, prepayment and recovery rates and other relevant information. In constructing these assumptions, the Corporation considers the following:
	•		that current defaults would have no recovery;
	•		that some individually analyzed deferrals will cure at rates varying from 10% to 90% after the deferral period ends;
	•		recent historical performance metrics, including profitability, capital ratios, loan charge-offs and loan reserve ratios, for the underlying institutions that would indicate a higher probability of default by the institution;
	•		that institutions identified as possessing a higher probability of default would recover at a rate of 10% for banks and 15% for insurance companies;
	•		that financial performance of the financial sector continues to be affected by the economic environment resulting in deferrals not curing and defaulting in the future;
	•		whether the security is currently deferring interest; and
	•		the external rating of the security and recent changes to its external rating.
The primary evidence utilized by the Corporation is the level of current deferrals and defaults, the level of excess subordination that allows for receipt of full principal and interest, the credit rating for each security and the likelihood that future deferrals and defaults will occur at a level that will fully erode the excess subordination based on an assessment of the underlying collateral. The Corporation combines the results of these factors considered in estimating the future cash flows of these securities to determine whether there has been an adverse change in estimated cash flows from the cash flows previously projected.
The Corporation’s portfolio of TPS consists of 23 pooled issues, primarily obtained through acquisitions, and four single-issuer securities. Two of the pooled issues are senior tranches; the remaining 21 are mezzanine tranches. At December 31, 2013, the 23 pooled TPS had an estimated fair value of $31,595 while the single-issuer TPS had an estimated fair value of $5,950. The Corporation has concluded from the analysis performed at December 31, 2013 that it is probable that the Corporation will collect all contractual principal and interest payments on all of its single-issuer and pooled TPS sufficient to recover the amortized cost basis of the securities.
At December 31, 2013, all four single-issuer TPS are current in regards to their principal and interest payments. Of the 23 pooled TPS, three are accruing interest based on the coupon rate, 18 are accreting income based on future expected cash flows and the remaining two are on non-accrual status. Income of $3,338 and $2,831 was recognized on pooled TPS for 2013 and 2012, respectively. Included in the amount for 2012 was $34 recognized on pooled TPS which were sold during 2012.
The Corporation recognized net impairment losses on securities of $27 and $212 for 2013 and 2012, respectively, due to the write-down of securities that the Corporation deemed to be other-than-temporarily impaired.
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 Year Ended December 31, 2013
Beginning balance		$	17,155			$	212			$	—			$	17,367
Loss where impairment was not previously recognized			—				—				27				27
Additional loss where impairment was previously recognized			—				—				—				—
Reduction due to credit impaired securities sold			—				(212	)			—				(212	)
Ending balance		$	17,155			$	—			$	27			$	17,182
For the Year Ended December 31, 2012
Beginning balance		$	18,369			$	29				—			$	18,398
Loss where impairment was not previously recognized			—				212				—				212
Additional loss where impairment was previously recognized			—				—				—				—
Reduction due to credit impaired securities sold			(1,214	)			(29	)			—				(1,243	)
Ending balance		$	17,155			$	212				—			$	17,367
TPS continue to experience price volatility as the secondary market for such securities remains limited to select non-regulated buyers. Write-downs, when required, are based on an individual security’s credit performance and its ability to make its contractual principal and interest payments. Should credit quality deteriorate to a greater extent than projected, it is possible that additional write-downs may be required. The Corporation monitors actual deferrals and defaults as well as expected future deferrals and defaults to determine if there is a high probability for expected losses and contractual shortfalls of interest or principal, which could warrant further impairment. The Corporation evaluates its entire TPS portfolio each quarter to determine if additional write-downs are warranted.
The following table provides information relating to the Corporation’s TPS as of December 31, 2013:
Security		Class		Current				Amortized				Fair				Unrealized				Lowest	Number of			Actual		Actual		Projected			Expected		Excess
				Par				Cost				Value				Gain				Credit	Issuers			Defaults		Deferrals		Recovery			Defaults		Subordination
				Value												(Loss)				Ratings	Currently			(as a		(as a		Rates on			(%) (2)		(as a percent
																					Performing			percent of		percent of		Current					of current
																								original		original		Deferrals					collateral) (3)
																								collateral)		collateral)		-1
Pooled TPS:
P1		C1		$	5,500			$	2,611			$	1,567			$	(1,044	)		C		42			22		7		41			17		0
P2		C1			4,889				3,133				1,326				(1,807	)		C		40			16		15		45			14		0
P3		C1			5,561				4,416				1,691				(2,725	)		C		46			13		9		34			16		0
P4		C1			3,994				3,169				1,196				(1,973	)		C		51			16		6		46			16		0
P5		B3			2,000				780				373				(407	)		C		14			29		10		48			11		0
P6		B1			3,028				2,539				1,016				(1,523	)		C		50			15		18		50			10		0
P7		C			5,048				864				1,453				589			C		38			14		19		38			13		0
P8		C			2,011				788				341				(447	)		C		44			16		11		36			17		0.32
P9		A4L			2,000				645				456				(189	)		C		25			16		10		37			11		0
Total OTTI					34,031				18,945				9,419				(9,526	)				350			17		11		42			15
P10		C1			5,219				1,109				1,487				378			C		42			22		7		41			17		0
P11		A2A			5,000				2,240				2,384				144			B+		40			16		15		45			14		51.83
P12		C1			4,781				1,371				1,454				83			C		46			13		9		34			16		0
P13		C1			5,260				1,336				1,574				238			C		51			16		6		46			16		0
P14		C1			5,190				1,108				1,357				249			C		57			15		12		28			17		0
P15		C1			3,206				429				616				187			C		41			21		6		23			17		0
P16		C			3,339				678				775				97			C		37			17		9		31			14		0
P17		B			2,069				694				763				69			Ca		33			14		17		40			14		21.87
P18		B2			5,000				2,243				3,096				853			CCC		19			0		8		90			14		38.1
P19		B			4,080				976				1,498				522			C		44			16		11		36			17		15
P20		A1			3,279				1,977				2,107				103			BB-		46			21		6		42			15		55.16
P21		B			5,000				1,327				1,331				4			C		16			18		5		49			11		0
P22		C1			5,531				1,440				1,954				514			C		25			15		7		40			10		0
P23		C1			5,606				1,330				1,780				450			C		24			16		8		42			10		0
Total Not OTTI					62,560				18,258				22,176				3,918					521			16		9		41			15
Total Pooled TPS				$	96,591			$	37,203			$	31,595			$	(5,608	)				871			16		10		41			15
Single Issuer TPS:
S1				$	2,000			$	1,955			$	1,580			$	(375	)		BB		1
S2					2,000				1,925				1,630				(295	)		BBB		1
S3					2,000				2,000				1,950				(50	)		B+		1
S4					1,000				999				790				(209	)		BB		1
Total Single Issuer TPS				$	7,000			$	6,879			$	5,950			$	(929	)				4
Total TPS				$	103,591			$	44,082			$	37,545			$	(6,537	)				875
-1	Some current deferrals are expected to cure at rates varying from 10% to 90% after five years.
-2	Expected future defaults as a percent of remaining performing collateral.
-3	Excess subordination represents the additional defaults in excess of both current and projected defaults that the CDO can absorb before the bond experiences any credit impairment.
States of the U.S. and Political Subdivisions
The Corporation’s municipal bond portfolio of $149,164 as of December 31, 2013 is highly rated with an average entity-specific rating of AA and 99.2% of the portfolio rated A or better. General obligation bonds comprise 98.9% of the portfolio. Geographically, municipal bonds support the Corporation’s footprint as 79.0% of the securities are from municipalities located throughout Pennsylvania. The average holding size of the securities in the municipal bond portfolio is $1,001. In addition to the strong stand-alone ratings, 67.0% of the municipalities have purchased credit enhancement insurance to strengthen 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	12 Months Ended
	Dec. 31, 2013
Text Block [Abstract]	'
Federal Home Loan Bank Stock	'
	5.    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 December 31, 2013 and 2012, the Corporation’s FHLB stock totaled $23,636 and $24,560, 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, along with quarterly cash dividends in 2013, 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	12 Months Ended
	Dec. 31, 2013
Receivables [Abstract]	'
Loans and Allowance for Loan Losses	'
	6.    Loans and Allowance for Loan Losses
	Following is a summary of loans, net of unearned income:
			Originated			Acquired			Total
			Loans			Loans			Loans
	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
	December 31, 2012
	Commercial real estate		$	2,448,471		$	258,575		$	2,707,046
	Commercial and industrial			1,555,301			47,013			1,602,314
	Commercial leases			130,133			—			130,133
	Total commercial loans and leases			4,133,905			305,588			4,439,493
	Direct installment			1,108,865			69,665			1,178,530
	Residential mortgages			653,826			438,402			1,092,228
	Indirect installment			568,324			13,713			582,037
	Consumer lines of credit			732,534			72,960			805,494
	Other			39,937			—			39,937
			$	7,237,391		$	900,328		$	8,137,719
	The carrying amount of acquired loans at December 31, 2013 totaled $1,345,429, including purchased credit-impaired (PCI) loans with a carrying amount of $21,192, while the carrying amount of acquired loans at December 31, 2012 totaled $896,148, including PCI loans with a carrying amount of $15,864. 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, while the outstanding contractual balance receivable of acquired loans at December 31, 2012 totaled $949,862, including PCI loans with an outstanding contractual balance receivable of $41,134.
	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 consist of loans 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 commercial real estate portfolio also includes run-off loans in Florida, which totaled $39,379 or 0.4% of total loans at December 31, 2013, compared to $68,627 or 0.8% of total loans at December 31, 2012. Additionally, the total loan portfolio contains consumer finance loans to individuals in Pennsylvania, Ohio, Tennessee and Kentucky, which totaled $179,970 or 1.9% of total loans at December 31, 2013, compared to $170,999 or 2.1% of total loans at December 31, 2012. Due to the relative size of the consumer finance loan portfolio, they are not segregated from other consumer loans.
	As of December 31, 2013, 43.1% of the commercial real estate loans were owner-occupied, while the remaining 56.9% were non-owner-occupied, compared to 46.5% and 53.5%, respectively, as of December 31, 2012. As of December 31, 2013 and 2012, the Corporation had commercial construction loans of $252,842 and $190,206, respectively, representing 2.7% and 2.3% of total loans, respectively. As of December 31, 2013 and 2012, there were no concentrations of loans relating to any industry in excess of 10% of total loans.
	The Corporation has extended credit to certain directors and executive officers and their related interests. These related-party loans were made in the ordinary course of business under normal credit terms and do not involve more than a normal risk of collection. Following is an analysis of these loans to related parties:
	Total loans at December 31, 2012		$	74,096
	New loans			3,210
	Repayments			(7,749	)
	Other			(25,334	)
	Total loans at December 31, 2013		$	44,223
	Other represents the net change in loan balances resulting from changes in related parties during 2013.
	ASC 310-30 Loans
	All loans acquired in the PVF, ANNB and Parkvale acquisitions, 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 ASC310-30 (impaired and non-impaired) acquired from PVF and ANNB in 2013 and Parkvale in 2012:
			Acquired			Acquired			Total
			Impaired			Performing
			Loans			Loans
	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
	Acquired from Parkvale in 2012
	Contractually required cash flows at acquisition		$	12,224		$	1,327,342		$	1,339,566
	Non-accretable difference (expected losses and foregone interest)			(6,070	)		(214,541	)		(220,611	)
	Cash flows expected to be collected at acquisition			6,154			1,112,801			1,118,955
	Accretable yield			(589	)		(293,594	)		(294,183	)
	Basis in acquired loans at acquisition		$	5,565		$	819,207		$	824,772
	The following table provides a summary of change in accretable yield for all acquired loans:
			Acquired			Acquired			Total
			Impaired			Performing
			Loans			Loans
	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
Year Ended December 31, 2012
Balance at beginning of period		$	2,477		$	49,229		$	51,706
Acquisitions			589			293,594			294,183
Reduction due to unexpected early payoffs			—			(57,840	)		(57,840	)
Reclass from non-accretable difference			3,539			10,915			14,454
Disposals/transfers			(49	)		(615	)		(664	)
Accretion			(5,778	)		(41,908	)		(47,686	)
Balance at end of period		$	778		$	253,375		$	254,153
Purchased Credit-Impaired 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 PVF:
		At			December 31,
		Acquisition			2013
Outstanding balance		$	29,811		$	29,642
Carrying amount			11,412			11,063
Allowance for loan losses			n/a			—
Impairment recognized since acquisition			n/a			—
Allowance reduction recognized since acquisition			n/a			—
Following is information about PCI loans identified in the Corporation’s acquisition of ANNB:
		At			December 31,
		Acquisition			2013
Outstanding balance		$	12,220		$	5,580
Carrying amount			3,848			2,308
Allowance for loan losses			n/a			—
Impairment recognized since acquisition			n/a			31
Allowance reduction recognized since acquisition			n/a			—
Following is information about the Corporation’s PCI loans:
		Outstanding			Non-Accretable			Expected			Accretable			Recorded
		Balance			Difference			Cash Flows			Yield			Investment
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
For the Year Ended December 31, 2012
Balance at beginning of period		$	51,693		$	(33,377	)	$	18,316		$	(2,477	)	$	15,839
Acquisitions			9,135			(2,981	)		6,154			(589	)		5,565
Accretion			—			—			—			5,778			5,778
Payments received			(9,556	)		—			(9,556	)		—			(9,556	)
Reclass from non-accretable difference			—			3,539			3,539			(3,539	)		—
Disposals/transfers			(12,494	)		11,442			(1,052	)		49			(1,003	)
Contractual interest			2,356			(2,356	)		—			—			—
Balance at end of period		$	41,134		$	(23,733	)	$	17,401		$	(778	)	$	16,623
The accretion in the table above includes $440 in 2013 and $3,539 in 2012 that primarily represents payoffs 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 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:
December 31		2013			2012
Non-accrual loans		$	58,755		$	66,004
Troubled debt restructurings			18,698			14,876
Total non-performing loans			77,453			80,880
Other real estate owned (OREO)			40,681			35,257
Total non-performing loans and OREO			118,134			116,137
Non-performing investments			797			2,809
Total non-performing assets		$	118,931		$	118,946
Asset quality ratios:
Non-performing loans as a percent of total loans			0.81	%		0.99	%
Non-performing loans + OREO as a percent of total loans + OREO			1.24	%		1.42	%
Non-performing assets as a percent of total assets			0.88	%		0.99	%
The following tables provide an analysis of the aging of loans by class segregated by loans originated and loans acquired:
		30-89 Days			³ 90 Days			Non-Accrual			Total			Current			Total
		Past  Due			Past Due  and						Past Due						Loans
					Still Accruing
Originated loans:
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
December 31, 2012
Commercial real estate		$	5,786		$	533		$	47,895		$	54,214		$	2,394,257		$	2,448,471
Commercial and industrial			7,310			456			6,017			13,783			1,541,518			1,555,301
Commercial leases			1,671			—			965			2,636			127,497			130,133
Total commercial loans and leases			14,767			989			54,877			70,633			4,063,272			4,133,905
Direct installment			8,834			2,717			3,342			14,893			1,093,972			1,108,865
Residential mortgages			15,821			2,365			2,891			21,077			632,749			653,826
Indirect installment			5,114			374			1,039			6,527			561,797			568,324
Consumer lines of credit			1,633			247			355			2,235			730,299			732,534
Other			36			15			3,500			3,551			36,386			39,937
		$	46,205		$	6,707		$	66,004		$	118,916		$	7,118,475		$	7,237,391
		30-89			³ 90 Days			Non-			Total			Current			Discount			Total
		Days			Past Due			Accrual			Past									Loans
		Past Due			and Still						Due (1)(2)
					Accruing
Acquired Loans:
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
December 31, 2012
Commercial real estate		$	6,829		$	13,597			—		$	20,426		$	250,116		$	(11,967	)	$	258,575
Commercial and industrial			1,653			138			—			1,791			47,351			(2,129	)		47,013
Commercial leases			—			—			—			—			—			—			—
Total commercial loans and leases			8,482			13,735			—			22,217			297,467			(14,096	)		305,588
Direct installment			1,454			947			—			2,401			63,502			3,762			69,665
Residential mortgages			12,137			21,069			—			33,206			439,620			(34,424	)		438,402
Indirect installment			347			56			—			403			14,089			(779	)		13,713
Consumer lines of credit			379			778			—			1,157			75,800			(3,997	)		72,960
Other			—			—			—			—			—			—			—
		$	22,799		$	36,585			—		$	59,384		$	890,478		$	(49,534	)	$	900,328
-1	Past due information for loans acquired is based on the contractual balance outstanding at December 31, 2013 and December 31, 2012.
-2	Acquired loans are considered performing upon acquisition, regardless of whether the customer is contractually delinquent, if the Corporation can reasonably estimate the timing and amount of expected cash flows on such loans. Accordingly, the Corporation does not consider acquired contractually delinquent loans to be non-accrual or non-performing and continues to recognize interest income on these loans using the accretion method.
The Corporation utilizes the following categories to monitor credit quality within its commercial loan portfolio:
Rating		Definition
Category
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 migration and roll rate analysis 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 as of December 31, 2013.
		Commercial Loan Credit Quality Categories
		Pass			Special			Substandard			Doubtful			Total
					Mention
Originated Loans:
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
December 31, 2012
Commercial real estate		$	2,282,139		$	57,938		$	106,258		$	2,136		$	2,448,471
Commercial and industrial			1,472,598			32,227			49,814			662			1,555,301
Commercial leases			126,283			243			3,607			—			130,133
		$	3,881,020		$	90,408		$	159,679		$	2,798		$	4,133,905
Acquired Loans:
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
December 31, 2012
Commercial real estate		$	204,300		$	14,713		$	39,093		$	469		$	258,575
Commercial and industrial			39,596			3,611			3,804			2			47,013
Commercial leases			—			—			—			—			—
		$	243,896		$	18,324		$	42,897		$	471		$	305,588
Credit quality information for acquired loans is based on the contractual balance outstanding at December 31, 2013 and 2012. The increase in acquired loans in 2013 relates to the PVF and ANNB acquisitions on October 12, 2013 and April 6, 2013, respectively.
The Corporation uses payment status and delinquency migration analysis 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, as well as other external statistics and factors such as unemployment, to determine how consumer loans are performing.
Following is a table showing originated consumer and other loans by payment status:
		Consumer Loan Credit Quality by Payment Status
		Performing			Non-Performing			Total
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
December 31, 2012
Direct installment		$	1,100,324		$	8,541		$	1,108,865
Residential mortgages			642,406			11,420			653,826
Indirect installment			567,192			1,132			568,324
Consumer lines of credit			731,788			746			732,534
Other			36,437			3,500			39,937
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, commercial leases and commercial loan relationships less than $500. 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:
At or For the Year Ended		Recorded			Unpaid			Related			Average
December 31, 2013		Investment			Principal			Allowance			Recorded
					Balance						Investment
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			—			—			—			—
At or For the Year Ended		Recorded			Unpaid			Related			Average
December 31, 2012		Investment			Principal			Allowance			Recorded
					Balance						Investment
With no specific allowance recorded:
Commercial real estate		$	37,119		$	50,234		$	—		$	36,426
Commercial and industrial			7,074			9,597			—			6,992
Commercial leases			965			—			—			1,053
Total commercial loans and leases			45,158			59,831			—			44,471
Direct installment			8,541			8,693			—			6,443
Residential mortgages			11,414			11,223			—			9,059
Indirect installment			1,132			2,381			—			1,133
Consumer lines of credit			746			792			—			591
Other			3,500			3,500			—			3,500
With a specific allowance recorded:
Commercial real estate			12,623			21,877			2,136			14,522
Commercial and industrial			590			590			590			592
Commercial leases			—			—			—			—
Total commercial loans and leases			13,213			22,467			2,726			15,114
Direct installment			—			—			—			—
Residential mortgages			—			—			—			—
Indirect installment			—			—			—			—
Consumer lines of credit			—			—			—			—
Other			—			—			—			—
Total:
Commercial real estate			49,742			72,111			2,136			50,948
Commercial and industrial			7,664			10,187			590			7,584
Commercial leases			965			—			—			1,053
Total commercial loans and leases			58,371			82,298			2,726			59,585
Direct installment			8,541			8,693			—			6,443
Residential mortgages			11,414			11,223			—			9,059
Indirect installment			1,132			2,381			—			1,133
Consumer lines of credit			746			792			—			591
Other			3,500			3,500			—			3,500
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 $22,192 at December 31, 2013 and $16,623 at December 31, 2012. 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 $3,093; 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 and commercial real estate of $1,955; commercial and industrial of $1,140; direct installment of $657; residential mortgages of $69; and indirect installment of $359, totaling $4,180 at December 31, 2012.
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 composition of total TDRs:
December 31		2013			2012
Accruing:
Performing		$	10,220		$	12,659
Non-performing			18,698			14,876
Non-accrual			12,705			12,385
		$	41,623		$	39,920
TDRs that are accruing and performing include loans that 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 2013, the Corporation returned to performing status $2,952 in restructured loans, a majority of which were secured by residential mortgages, after these borrowers consistently met their modified obligations for more than six months. TDRs that are accruing and non-performing are comprised of both consumer and commercial loans that have not yet demonstrated a full six month repayment cycle based upon the modified terms though it is still 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 under their modified terms, and could 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 $561 and $41 at December 31, 2013 and December 31, 2012, respectively, and pooled reserves for individual loans under $500 of $193 and $297 for those same periods, based on historical loss experience. 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 $1,005 and $1,455 at December 31, 2013 and 2012, 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:
Year Ended December 31		2013									2012
		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			10		$	4,439		$	3,588			21		$	4,067		$	4,505
Commercial and industrial			—			—			—			8			389			257
Commercial leases			—			—			—			—			—			—
Total commercial loans and leases			10			4,439			3,588			29			4,456			4,762
Direct installment			409			4,198			3,971			362			3,876			3,763
Residential mortgages			54			2,464			2,366			56			2,232			2,814
Indirect installment			28			117			107			31			169			151
Consumer lines of credit			19			148			143			20			214			315
Other			—			—			—			—			—			—
			520		$	11,366		$	10,175			498		$	10,947		$	11,805
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.
Year Ended December 31		2013						2012
		Number			Recorded			Number			Recorded
		of			Investment  (1)			of			Investment  (1)
		Contracts						Contracts
Commercial real estate			1		$	737			—		$	—
Commercial and industrial			1			12			—			—
Commercial leases			—			—			—			—
Total commercial loans and leases			2			749			—			—
Direct installment			76			380			38			249
Residential mortgages			7			303			5			229
Indirect installment			6			36			3			5
Consumer lines of credit			1			85			—			—
Other			—			—			—			—
			92		$	1,553			46		$	483
-1	The recorded investment is as of period end.
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 Year									Offs			Losses			Year
Year Ended December 31, 2013
Commercial real estate		$	34,810		$	(5,465	)	$	1,799		$	(3,666	)	$	1,404		$	32,548
Commercial and industrial			31,849			(5,124	)		2,108			(3,016	)		3,770			32,603
Commercial leases			1,744			(432	)		179			(253	)		412			1,903
Total commercial loans and leases			68,403			(11,021	)		4,086			(6,935	)		5,586			67,054
Direct installment			15,130			(9,059	)		931			(8,128	)		10,822			17,824
Residential mortgages			5,155			(1,345	)		162			(1,183	)		1,864			5,836
Indirect installment			5,449			(3,337	)		773			(2,564	)		3,524			6,409
Consumer lines of credit			6,057			(1,974	)		274			(1,700	)		2,874			7,231
Other			—			(965	)		—			(965	)		1,495			530
Total allowance on originated loans			100,194			(27,701	)		6,226			(21,475	)		26,165			104,884
Purchased credit-impaired loans			759			(299	)		—			(299	)		540			1,000
Other acquired loans			3,421			(2,530	)		(376	)		(2,906	)		4,385			4,900
Total allowance on acquired loans			4,180			(2,829	)		(376	)		(3,205	)		4,925			5,900
Total allowance		$	104,374		$	(30,530	)	$	5,850		$	(24,680	)	$	31,090		$	110,784
Year Ended December 31, 2012
Commercial real estate		$	43,283		$	(8,688	)	$	1,765		$	(6,923	)	$	(1,550	)	$	34,810
Commercial and industrial			25,476			(8,098	)		693			(7,405	)		13,778			31,849
Commercial leases			1,556			(509	)		224			(285	)		473			1,744
Total commercial loans and leases			70,315			(17,295	)		2,682			(14,613	)		12,701			68,403
Direct installment			14,814			(7,875	)		942			(6,933	)		7,249			15,130
Residential mortgages			4,437			(1,050	)		194			(856	)		1,574			5,155
Indirect installment			5,503			(2,926	)		605			(2,321	)		2,267			5,449
Consumer lines of credit			5,447			(2,137	)		234			(1,903	)		2,513			6,057
Other			146			(1,039	)		14			(1,025	)		879			—
Total allowance on originated loans			100,662			(32,322	)		4,671			(27,651	)		27,183			100,194
Purchased credit-impaired loans			—			—			—			—			759			759
Other acquired loans			—			(254	)		315			61			3,360			3,421
Total allowance on acquired loans			—			(254	)		315			61			4,119			4,180
Total allowance		$	100,662		$	(32,576	)	$	4,986		$	(27,590	)	$	31,302		$	104,374
Year Ended December 31, 2011
Commercial real estate		$	49,924		$	(21,018	)	$	594		$	(20,424	)	$	13,783		$	43,283
Commercial and industrial			24,682			(3,642	)		368			(3,274	)		4,068			25,476
Commercial leases			1,070			(567	)		75			(492	)		978			1,556
Total commercial loans and leases			75,676			(25,227	)		1,037			(24,190	)		18,829			70,315
Direct installment			14,941			(8,874	)		876			(7,998	)		7,871			14,814
Residential mortgages			4,578			(1,261	)		67			(1,194	)		1,053			4,437
Indirect installment			5,941			(2,957	)		501			(2,456	)		2,018			5,503
Consumer lines of credit			4,743			(2,110	)		213			(1,897	)		2,601			5,447
Other			241			(1,194	)		31			(1,163	)		1,068			146
Total allowance on originated loans			106,120			(41,623	)		2,725			(38,898	)		33,440			100,662
Purchased credit-impaired loans			—			(208	)		7			(201	)		201			—
Other acquired loans			—			—			—			—			—			—
Total allowance on acquired loans			—			(208	)		7			(201	)		201			—
Total allowance		$	106,120		$	(41,831	)	$	2,732		$	(39,099	)	$	33,641		$	100,662
Following is a summary of the individual and collective originated allowance for loan losses and corresponding originated loan balances by class:
		Allowance						Loans Outstanding
		Individually			Collectively			Originated			Individually			Collectively
		Evaluated			Evaluated			Loans			Evaluated			Evaluated
		for			for						for			for
		Impairment			Impairment						Impairment			Impairment
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
December 31, 2012
Commercial real estate		$	2,136		$	32,674		$	2,448,471		$	35,024		$	2,413,447
Commercial and industrial			590			31,259			1,555,301			1,624			1,553,677
Commercial leases			—			1,744			130,133			—			130,133
Total commercial loans and leases			2,726			65,677			4,133,905			36,648			4,097,257
Direct installment			—			15,130			1,108,865			—			1,108,865
Residential mortgages			—			5,155			653,826			—			653,826
Indirect installment			—			5,449			568,324			—			568,324
Consumer lines of credit			—			6,057			732,534			—			732,534
Other			—			—			39,937			—			39,937
		$	2,726		$	97,468		$	7,237,391		$	36,648		$	7,200,743
The above table excludes acquired loans that were pooled into groups of loans for evaluating impairment.

Premises_and_Equipment

Premises and Equipment	12 Months Ended
	Dec. 31, 2013
Property Plant And Equipment [Abstract]	'
Premises and Equipment	'
	7.    Premises and Equipment
	Following is a summary of premises and equipment:
	December 31	2013			2012
	Land	$	34,234		$	31,196
	Premises		135,633			128,259
	Equipment		117,228			101,144
			287,095			260,599
	Accumulated depreciation		(133,063	)		(120,232	)
		$	154,032		$	140,367
	Depreciation expense for premises and equipment was $15,558 for 2013, $13,937 for 2012 and $12,457 for 2011.
	The Corporation has operating leases extending to 2045 for certain land, office locations and equipment, many of which have renewal options. Leases that expire are generally expected to be replaced by other leases. Lease costs are expensed in accordance with ASC 840, Leases, taking into account escalation clauses. Rental expense was $10,443 for 2013, $8,784 for 2012 and $6,960 for 2011.
	Total minimum rental commitments under such leases were $66,055 at December 31, 2013. Following is a summary of future minimum lease payments for years following December 31, 2013:
	2014	$	9,994
	2015		8,769
	2016		7,743
	2017		7,131
	2018		5,545
	Later years		26,873

Goodwill_and_Other_Intangible_

Goodwill and Other Intangible Assets	12 Months Ended
	Dec. 31, 2013
Goodwill And Intangible Assets Disclosure [Abstract]	'
Goodwill and Other Intangible Assets	'
	8. Goodwill and Other Intangible Assets
	The following table shows a rollforward of goodwill by line of business:
		Community			Wealth			Insurance			Consumer			Total
		Banking			Manage-						Finance
					ment
	Balance at January 1, 2012	$	549,683		$	8,020		$	8,950		$	1,809		$	568,462
	Goodwill additions		107,093			—			—			—			107,093
	Balance at December 31, 2012		656,776			8,020			8,950			1,809			675,555
	Goodwill additions		88,693			—			—			—			88,693
	Balance at December 31, 2013	$	745,469		$	8,020		$	8,950		$	1,809		$	764,248
	The Corporation recorded goodwill during 2013 and 2012 as a result of the purchase accounting adjustments relating to the acquisitions of PVF, ANNB and Parkvale.
	The following table shows a summary of core deposit intangibles, customer and renewal lists and other intangible assets:
		Core			Customer			Other			Total
		Deposit			and Renewal			Intangible			Finite-lived
		Intangibles			Lists			Assets			Intangibles
	December 31, 2013
	Gross carrying amount	$	97,698		$	10,970		$	10,380		$	119,048
	Accumulated amortization		(62,793	)		(6,407	)		(2,240	)		(71,440	)
		$	34,905		$	4,563		$	8,140		$	47,608
	December 31, 2012
	Gross carrying amount	$	87,056		$	10,970		$	1,859		$	99,885
	Accumulated amortization		(55,095	)		(5,698	)		(1,241	)		(62,034	)
		$	31,961		$	5,272		$	618		$	37,851
	Core deposit intangibles are being amortized primarily over 10 years using straight-line and accelerated methods. Customer and renewal lists and other intangible assets are being amortized over their estimated useful lives which range from eight to twelve years.
	Amortization expense on finite-lived intangible assets totaled $8,407 for 2013, $8,924 for 2012 and $7,040 for 2011. Following is a summary of the expected amortization expense on finite-lived intangible assets, assuming no new additions, for each of the five years following December 31, 2013:
	2014	$	8,615
	2015		6,590
	2016		5,580
	2017		4,855
	2018		3,379
	Goodwill and other intangible assets are reviewed annually for impairment, and more frequently if impairment indicators exist. The Corporation completed this review in 2013 and 2012 and determined that its intangible assets are not impaired.

Deposits

Deposits	12 Months Ended
	Dec. 31, 2013
Banking And Thrift [Abstract]	'
Deposits	'
	9.    Deposits
	Following is a summary of deposits:
	December 31	2013		2012
	Non-interest bearing demand	$	2,200,081	$	1,738,195
	Savings and NOW		5,392,078		4,808,121
	Certificates and other time deposits		2,606,073		2,535,858
		$	10,198,232	$	9,082,174
	Time deposits of $100,000 or more were $857,470 and $795,113 at December 31, 2013 and 2012, respectively. Following is a summary of these time deposits by remaining maturity at December 31, 2013:
		Certificates		Other		Total
		of Deposit		Time
				Deposits
	Three months or less	$	117,298	$	10,297	$	127,595
	Three to six months		121,512		8,659		130,171
	Six to twelve months		190,656		25,468		216,124
	Over twelve months		258,989		124,591		383,580
		$	688,455	$	169,015	$	857,470
	Following is a summary of the scheduled maturities of certificates and other time deposits for the years following December 31, 2013:
	2014	$	1,499,828
	2015		485,809
	2016		279,663
	2017		211,214
	2018		93,915
	Later years		35,644

ShortTerm_Borrowings

Short-Term Borrowings	12 Months Ended
	Dec. 31, 2013
Debt Disclosure [Abstract]	'
Short-Term Borrowings	'
	10.    Short-Term Borrowings
	Following is a summary of short-term borrowings:
	December 31	2013		2012
	Securities sold under repurchase agreements	$	841,741	$	807,820
	Federal funds purchased		270,000		140,000
	Subordinated notes		129,498		135,318
		$	1,241,239	$	1,083,138
	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.
	The weighted average interest rates on short-term borrowings during 2013, 2012 and 2011 were 0.43%, 0.53% and 0.84%, respectively. The weighted average interest rates on short-term borrowings at December 31, 2013, 2012 and 2011 were 0.41%, 0.47% and 0.71%, respectively.

LongTerm_Debt

Long-Term Debt	12 Months Ended
	Dec. 31, 2013
Debt Disclosure [Abstract]	'
Long-Term Debt	'
	11.    Long-Term Debt
	Following is a summary of long-term debt:
	December 31	2013		2012
	Federal Home Loan Bank advances	$	50,076	$	88
	Subordinated notes		84,637		79,897
	Other subordinated debt		8,637		8,850
	Convertible subordinated notes		578		590
		$	143,928	$	89,425
	The Corporation’s banking affiliate has available credit with the FHLB of $3,349,926, of which $50,076 was used as of December 31, 2013. These advances are secured by loans collateralized by 1-4 family mortgages and FHLB stock and are scheduled to mature in various amounts periodically through the year 2019. Effective interest rates paid on these advances ranged from 1.06% to 4.19% for 2013 and 3.78% to 4.19% for 2012.
	Subordinated notes are unsecured and subordinated to other indebtedness of the Corporation. The long-term subordinated notes mature in various amounts periodically through the year 2022. At December 31, 2013, all of the long-term subordinated debt is redeemable by the holders prior to maturity at a discount equal to three to twelve months of interest, depending on the term of the note. The Corporation may require the holder to give 30 days prior written notice. No sinking fund is required and none has been established to retire the debt. The weighted average interest rate on long-term subordinated debt was 2.77% at December 31, 2013, 3.18% at December 31, 2012 and 3.85% at December 31, 2011.
	The Corporation assumed other subordinated notes totaling $8,000 in conjunction with an acquisition. The Corporation recorded a purchase accounting adjustment of $1,275, which is amortizing over the life of the notes, to reflect these notes at their fair value at the time of the acquisition. These subordinated notes carry a fixed-rate of 8.0% and mature in 2016. The Corporation may elect to redeem the notes, subject to regulatory approval, in whole or in part, at any time at a redemption price equal to 100% of the principal amount plus accrued and unpaid interest. The noteholders have been notified of the Corporation’s intention to redeem the notes by April 1, 2014.
	The Corporation assumed 5% convertible subordinated notes in conjunction with an acquisition. These subordinated notes mature in 2018 and are convertible into shares of the Corporation’s common stock at any time prior to maturity at $12.50 per share. As of December 31, 2013, the Corporation has reserved 46,200 shares of common stock for issuance in the event the convertible subordinated notes are converted. The Corporation may elect to redeem the notes, subject to regulatory approval, in whole or in part, at any time at a redemption price equal to 100% of the principal amount plus accrued and unpaid interest. The noteholders have been notified of the Corporation’s intention to redeem the notes in February 2014.
	Scheduled annual maturities for all of the long-term debt for the years following December 31, 2013 are as follows:
	2014	$	28,546
	2015		23,023
	2016		75,409
	2017		10,445
	2018		3,077
	Later years		3,428

Junior_Subordinated_Debt

Junior Subordinated Debt	12 Months Ended
	Dec. 31, 2013
Text Block [Abstract]	'
Junior Subordinated Debt	'
	12.    Junior Subordinated Debt
	The Corporation has three unconsolidated subsidiary trusts (collectively, the Trusts): F.N.B. Statutory Trust II, Omega Financial Capital Trust I and Sun Bancorp Statutory 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 the third-party investors are the primary beneficiaries, the Trusts qualify as variable interest entities (VIEs) and 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 and Sun Bancorp Statutory Trust I were acquired as a result of a previous 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 phase-out limitations as to their continued eligibility to qualify as tier 1 capital 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 second quarter of 2013, $15,000 of the Corporation-issued TPS was repurchased at a discount and the related debt extinguished. This $15,000 was opportunistically purchased at auction and represents a portion of the underlying collateral of a pooled TPS that was liquidated by the trustee. During the fourth quarter of 2013, the Corporation redeemed $115,000 of the Corporation-issued TPS in conjunction with its capital raise completed during the same quarter. The regulatory capital ratios at December 31, 2013 reflect the reduction of $130,000 of TPS.
	The following table provides information relating to the Trusts as of December 31, 2013:
		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		1.89	%	Variable; LIBOR + 165 basis points (bps)
	Omega Financial Capital Trust I		36,000		1,114		36,029		10/18/34		2.44	%	Variable; LIBOR + 219 bps
	Sun Bancorp Statutory Trust I		16,500		511		17,011		2/22/31		10.2	%	Fixed
		$	74,000	$	2,290	$	75,205
	The Sun Bancorp Statutory Trust I holders have been notified of the Corporation’s intention to redeem their debt in February 2014.

Derivative_Instruments

Derivative Instruments	12 Months Ended
	Dec. 31, 2013
Derivative Instruments And Hedging Activities Disclosure [Abstract]	'
Derivative Instruments	'
	13.    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 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. 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 four separate interest rate derivative agreements between December 2012 and August 2013 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 to fixed 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 year ended December 31, 2013.
	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 December 31, 2013, the Corporation was party to 312 swaps with customers with notional amounts totaling $828,576 and 278 swaps with derivative counterparties with notional amounts totaling $1,028,576.
	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:
	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
	December 31, 2012
	Derivative assets subject to master netting arrangement:
	Equity contracts		$	16		—		$	16
	Derivative assets not subject to master netting arrangement:
	Interest rate contracts			57,992		—			57,992
	Total derivative assets		$	58,008		—		$	58,008
	Offsetting of Derivative Liabilities:
	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
	December 31, 2012
	Derivative liabilities subject to master netting arrangement:
	Interest rate contracts		$	58,134		—		$	58,134
	Derivative liabilities not subject to master netting arrangement:
	Equity contracts			16		—			16
	Total derivative liabilities		$	58,150		—		$	58,150
	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:
	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
	December 31, 2012
	Counterparty E		$	16		—			—	$	16
Derivative Liabilities:
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
December 31, 2012
Counterparty A		$	8,393	$	8,393			—	$	—
Counterparty B			5,601		5,601			—		—
Counterparty C			2,145		2,145			—		—
Counterparty D			12,354		12,354			—		—
Counterparty E			8,846		8,846			—		—
Counterparty F			353		282			—		71
Counterparty G			5,497		5,497			—		—
Counterparty H			3,937		1,775			—		2,162
Counterparty I			11,008		11,008			—		—
		$	58,134	$	55,901			—	$	2,233
The following table presents the effect of the Corporation’s derivative financial instruments on the income statement:
		Income		Year Ended December 31,
		Statement
		Location		2013			2012		2011
Interest Rate Products			Other income	$	(39	)	$	167	$	(635	)
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 December 31, 2013 and 2012, 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 $38,239 and $59,341, respectively. At December 31, 2013, the Corporation has posted collateral with derivative counterparties with a fair value of $37,427 and cash collateral of $1,976. At December 31, 2012, the Corporation had posted collateral with derivative counterparties with a fair value of $60,062, of with none was cash collateral. 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 $2,224 and $2,428 as of December 31, 2013 and 2012, 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 December 31, 2013 and 2012 are not material.

Commitments_Credit_Risk_and_Co

Commitments, Credit Risk and Contingencies	12 Months Ended
	Dec. 31, 2013
Commitments And Contingencies Disclosure [Abstract]	'
Commitments, Credit Risk and Contingencies	'
	14.    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:
	December 31	2013		2012
	Commitments to extend credit	$	2,897,748	$	2,600,355
	Standby letters of credit		114,298		130,912
	At December 31, 2013, funding of 81.3% 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.
	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.
	Annapolis Bancorp, Inc. Stockholder Litigation
	On November 8, 2012, a purported stockholder of ANNB filed a derivative complaint on behalf of ANNB in the Circuit Court for Anne Arundel County, Maryland, captioned Andera v. Lerner, et al., Case no. 02C12173766, and naming as defendants ANNB, its board of directors and the Corporation. The lawsuit makes various allegations against the defendants, including that the merger consideration is inadequate and undervalues the company, that the director defendants breached their fiduciary duties to ANNB in approving the merger, and that the Corporation aided and abetted those alleged breaches. The lawsuit generally seeks an injunction barring the defendants from consummating the merger. In addition, the lawsuit seeks rescission of the merger agreement to the extent already implemented or, in the alternative, award of rescissory damages, an accounting to plaintiff for all damages caused by the defendants and for all profits and special benefits obtained as a result of the defendants’ alleged breaches of fiduciary duties, and an award of the costs and expenses incurred in the action, including a reasonable allowance for counsel fees and expert fees.
	On February 7, 2013, the plaintiff filed an amended complaint with additional allegations regarding certain purported non-disclosures relating to the proxy statement/prospectus for the pending merger filed with the SEC on January 23, 2013. On February 22, 2013, ANNB, the ANNB board of directors, the Corporation and the plaintiff reached an agreement in principle to settle the action, and executed a Stipulation of Settlement on June 28, 2013, that memorialized the agreement in writing. As part of the agreement to settle the action, the Corporation and ANNB agreed to disclose additional information in the proxy statement/prospectus filed on February 25, 2013. No substantive term of the merger agreement was modified as part of this settlement. On July 3, 2013, the plaintiff filed a motion for preliminary approval of the settlement, and on September 18, 2013, the court entered an order preliminarily approving the settlement. On November 25, 2013, the plaintiff filed a motion for final approval of the settlement. On December 10, 2013, the court held a final fairness hearing and, at the conclusion of the hearing, granted final approval of the settlement.
	BCSB Bancorp Stockholder Litigation
	On December 9, 2013, a purported stockholder of BCSB filed a putative class action and derivative complaint in the Circuit Court for Baltimore County, Maryland, captioned Darr v. BCSB Bancorp, Inc., et al., at Case No. 03-C-13-014034, and naming as defendants BCSB, its board of directors and the Corporation. The lawsuit makes various allegations against the defendants relating to the Corporation’s proposed acquisition of BCSB, including that the Registration Statement on Form S-4 filed on November 19, 2013 in connection with the proposed acquisition omits certain information allegedly necessary for BCSB’s stockholders to make an informed vote on the proposed transaction, that the director defendants breached their fiduciary duties to BCSB in approving the proposed transaction and that the Corporation aided and abetted those alleged breaches. The lawsuit generally sought an injunction barring the defendants from consummating the merger transaction. Alternatively, if the companies were to complete the transaction before the court entered judgment, the lawsuit sought rescission of the merger or, in the alternative, rescissory damages, an accounting for all resulting damages and for all profits and any special benefits defendants obtained as a result of the alleged breaches of fiduciary duty, and an award for the costs and expenses incurred in the lawsuit, including attorneys’ fees and costs. On January 30, 2014, the plaintiff voluntarily dismissed its complaint.

Stock_Incentive_Plans

Stock Incentive Plans	12 Months Ended
	Dec. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'
Stock Incentive Plans	'
	15.     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). The grant date fair value of the restricted stock awards is equal to the price of the Corporation’s common stock on the grant date. During 2013, 2012 and 2011, the Corporation issued 361,664, 321,295 and 407,980 restricted stock awards, respectively, with weighted average grant date fair values of $4,016, $3,884 and $4,110, respectively, under these Plans. The Corporation has available up to 2,716,902 shares of common stock to issue under these Plans.
	Under the Plans, more than half of the restricted stock awards granted to management are earned if the Corporation meets or exceeds certain financial performance results when compared to its peers. These performance-related awards are expensed ratably from the date that the likelihood of meeting the performance measure is probable through the end of a four-year vesting period. The service-based awards are expensed ratably over a three-year vesting period. The Corporation also issues discretionary service-based awards to certain employees that vest over five years.
	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 $5,063, $3,758 and $4,396 for the years ended December 31, 2013, 2012 and 2011, the tax benefit of which was $1,772, $1,315 and $1,538, respectively.
	The following table summarizes certain information concerning restricted stock awards:
		2013			Weighted		2012			Weighted		2011			Weighted
					Average					Average					Average
					Grant					Grant					Grant
					Price per					Price per					Price per
					Share					Share					Share
	Unvested shares outstanding at beginning of year		1,913,073		$	9.17		1,846,115		$	8.44		1,309,489		$	8.52
	Granted		361,664			11.1		321,295			12.09		407,980			10.07
	Net adjustment due to performance		165,545			9.6		28,181			8.31		229,516			8.4
	Vested		(734,129	)		7.9		(179,767	)		8.24		(172,029	)		13.57
	Forfeited		(37,828	)		10.42		(179,132	)		8.5		(1,749	)		10.09
	Dividend reinvestment		60,708			11.82		76,381			11.19		72,908			10.01
	Unvested shares outstanding at end of year		1,729,033			10.23		1,913,073			9.17		1,846,115			8.44
	The total fair value of shares vested was $8,259, $2,193 and $1,767 for the years ended December 31, 2013, 2012 and 2011, respectively.
	As of December 31, 2013, there was $4,891 of unrecognized compensation cost related to unvested restricted stock awards granted, $71 of which is subject to accelerated vesting under the plan’s immediate vesting upon retirement provision for awards granted prior to the adoption of ASC 718. The components of the restricted stock awards as of December 31, 2013 are as follows:
		Service-			Performance-		Total
		Based			Based
		Awards			Awards
	Unvested shares		446,239			1,282,794		1,729,033
	Unrecognized compensation expense	$	1,671		$	3,220	$	4,891
	Intrinsic value	$	5,632		$	16,189	$	21,821
	Weighted average remaining life (in years)		2.16			2.22		2.2
	Stock Options
	The Corporation did not grant stock options during 2013, 2012 or 2011. All outstanding stock options were granted at prices equal to the fair value at the date of the grant, are primarily exercisable within ten years from the date of the grant 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 69,429 for 2013, 182,188 for 2012 and 8,389 for 2011.
	The following table summarizes certain information concerning stock options:
		2013			Weighted		2012			Weighted		2011			Weighted
					Average					Average					Average
					Price per					Price per					Price per
					Share					Share					Share
	Options outstanding at beginning of year		640,050		$	13.21		586,020		$	14.93		770,610		$	14.28
	Assumed from acquisition		274,964			11.16		627,808			10.41		—			—
	Exercised		(69,429	)		7.46		(182,188	)		8.87		(8,389	)		2.68
	Forfeited		(312,061	)		15.58		(391,590	)		13.32		(176,201	)		12.67
	Options outstanding and exercisable at end of year		533,524			11.51		640,050			13.21		586,020			14.93
	Upon consummation of the Corporation’s acquisitions, all outstanding stock options issued by the acquired companies were converted into equivalent Corporation stock options.
	The following table summarizes information about stock options outstanding at December 31, 2013:
	Range of Exercise	Options			Weighted Average		Weighted Average
	Prices	Outstanding			Remaining		Exercise Price
		and Exercisable			Contractual Years
	$3.45 - $5.18		57,517			5.33	$	4.32
	$5.19 - $7.78		159,503			5.21		6.14
	$7.79 - $11.68		—			—		—
	$11.69 - $17.54		259,927			3.11		12.67
	$17.55 - $26.32		16,375			0		18.51
	$26.33 - $36.42		40,202			0.79		32.81
			533,524
	The intrinsic value of outstanding and exercisable stock options at December 31, 2013 was $559.
	The following table summarizes certain information relating to stock options exercised:
	Year Ended December 31	2013			2012		2011
	Proceeds from stock options exercised	$	365		$	864	$	22
	Tax benefit recognized from stock options exercised		79			96		22
	Intrinsic value of stock options exercised		318			435		63
	Warrants
	In conjunction with its participation in the 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 has been reduced in half to 651,042 shares as of 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 connection with the Parkvale acquisition, the warrant issued by Parkvale to the UST under the CPP was 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	12 Months Ended
	Dec. 31, 2013
Compensation And Retirement Disclosure [Abstract]	'
Retirement Plans	'
	16.    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 following tables provide information relating to the accumulated benefit obligation, change in benefit obligation, change in plan assets, the plans’ funded status and the amount included in the consolidated balance sheet for the qualified and non-qualified plans described above (collectively, the Plans):
	December 31	2013				2012
	Accumulated benefit obligation	$	139,483			$	153,606
	Projected benefit obligation at beginning of year	$	153,958			$	143,307
	Service cost		65				59
	Interest cost		5,728				6,173
	Actuarial (gain) loss		(13,486	)			11,558
	Benefits paid		(6,534	)			(7,139	)
	Projected benefit obligation at end of year	$	139,731			$	153,958
	Fair value of plan assets at beginning of year	$	113,416			$	105,330
	Actual return on plan assets		16,534				8,899
	Corporation contribution		16,321				6,326
	Benefits paid		(6,534	)			(7,139	)
	Fair value of plan assets at end of year	$	139,737			$	113,416
	Funded status of plans	$	6			$	(40,542	)
	The unrecognized actuarial loss, prior service cost and net transition obligation are required to be recognized into earnings over the average remaining participant life due to the freezing of the RIP, which may, on a net basis reduce future earnings.
	Actuarial assumptions used in the determination of the projected benefit obligation in the Plans are as follows:
	Assumptions at December 31	2013				2012
	Weighted average discount rate		4.68	%			3.78	%
	Rates of average increase in compensation levels		4	%			4	%
	The discount rate assumption at December 31, 2013 and 2012 was determined using a yield-curve based approach. A yield curve was produced for a universe containing the majority of U.S.-issued Aa-graded corporate bonds, all of which were non-callable (or callable with make-whole provisions), and after excluding the 10% of the bonds with the highest and lowest yields. The discount rate was developed as the level equivalent rate that would produce the same present value as that using spot rates aligned with the projected benefit payments.
	The net periodic pension cost and other comprehensive income for the Plans included the following components:
	Year Ended December 31	2013				2012			2011
	Service cost	$	65			$	59		$	58
	Interest cost		5,728				6,173			6,746
	Expected return on plan assets		(9,081	)			(7,935	)		(7,647	)
	Transition amount amortization		(93	)			(93	)		(93	)
	Prior service credit amortization		7				7			7
	Actuarial loss amortization		2,263				1,861			1,131
	Net periodic pension cost (gain)		(1,111	)			72			202
	Other changes in plan assets and benefit obligations recognized in other comprehensive income:
	Current year actuarial (gain) loss		(20,938	)			10,594			19,097
	Amortization of actuarial loss		(2,263	)			(1,861	)		(1,131	)
	Amortization of prior service credit		(7	)			(7	)		(7	)
	Amortization of transition asset		93				93			93
	Total recognized in other comprehensive income		(23,115	)			8,819			18,052
	Total recognized in net periodic pension cost (gain) and other comprehensive income	$	(24,226	)		$	8,891		$	18,254
	The plans have an actuarial measurement date of December 31. Actuarial assumptions used in the determination of the net periodic pension cost in the Plans are as follows:
	Assumptions for the Year Ended December 31	2013				2012			2011
	Weighted average discount rate		3.78	%			4.39	%		5.28	%
	Rates of increase in compensation levels		4	%			4	%		4	%
	Expected long-term rate of return on assets		7.25	%			7.5	%		7.5	%
	The expected long-term rate of return on plan assets has been established by considering historical and anticipated expected returns on the asset classes invested in by the pension trust and the allocation strategy currently in place among those classes.
	The change in plan assets reflects benefits paid from the qualified pension plans of $5,212 and $5,813 for 2013 and 2012, respectively, and employer contributions to the qualified pension plans of $15,000 and $5,000 for 2013 and 2012, respectively. For the non-qualified pension plans, the change in plan assets reflects benefits paid and contributions to the plans in the same amount. This amount represents the actual benefit payments paid from general plan assets of $1,322 for 2013 and $1,326 for 2012.
	As of December 31, 2013 and 2012, the projected benefit obligation, accumulated benefit obligation and fair value of plan assets for the qualified and non-qualified pension plans were as follows:
		Qualified Pension Plans							Non-Qualified
									Pension Plans
	December 31	2013				2012			2013			2012
	Projected benefit obligation	$	120,512			$	133,116		$	19,219		$	20,842
	Accumulated benefit obligation		120,512				133,116			18,971			20,490
	Fair value of plan assets		139,737				113,416			—			—
	The impact of changes in the discount rate, expected long-term rate of return on plan assets and compensation levels would have had the following effects on 2013 pension expense:
		Estimated
		Increase in
		Pension
		Expense
	0.5% decrease in the discount rate	$	(35	)
	0.5% decrease in the expected long-term rate of return on plan assets		626
	The following table provides information regarding estimated future cash flows relating to the Plans at December 31, 2013:
	Expected employer contributions:	2014		$	1,322
Expected benefit payments:	2014			6,510
	2015			6,862
	2016			7,246
	2017			9,127
	2018			8,113
	2019 – 2023			44,995
The qualified pension plan contributions are deposited into a trust and the qualified benefit payments are made from trust assets. For the non-qualified plans, the contributions and the benefit payments are the same and reflect expected benefit amounts, which are paid from general assets.
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 $9,300 for 2013, $8,860 for 2012 and $8,445 for 2011.
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.
Pension Plan Investment Policy and Strategy
The Corporation’s investment strategy for the RIP is to diversify plan assets between a wide mix of securities within the equity and debt markets in an effort to allow the plan the opportunity to meet the plan’s expected long-term rate of return requirements while minimizing short-term volatility. In this regard, the plan has targeted allocations within the equity securities category for domestic large cap, domestic mid cap, domestic small cap, real estate investment trusts, emerging market and international securities. Within the debt securities category, the plan has targeted allocation levels for U.S. Treasury, U.S. agency, domestic investment-grade bonds, high-yield bonds, inflation-protected securities and international bonds.
The following table presents asset allocations for the Corporation’s pension plans as of December 31, 2013 and 2012, and the target allocation for 2014, by asset category:
	Target				Percentage of Plan Assets
	Allocation
December 31	2014				2013			2012
Asset Category
Equity securities		45 - 65	%			57	%		57	%
Debt securities		30 - 50				40			40
Cash equivalents		0 - 10				3			3
At December 31, 2013 and 2012, equity securities included 550,128 shares of the Corporation’s common stock totaling $6,943 (5.0% of total plan assets) at December 31, 2012 and $5,842 (5.2% of total plan assets) at December 31, 2012. The plan did not acquire additional shares during 2013. Dividends received on the Corporation’s common stock held by the Plan were $264 for both 2013 and 2012.
The fair values of the Corporation’s pension plan assets by asset category are as follows:
	Level 1				Level 2			Level 3			Total
December 31, 2013
Asset Class
Cash	$	4,090			$	—			—		$	4,090
Equity securities:
F.N.B. Corporation		6,943				—			—			6,943
Other large-cap U.S. financial services companies		2,354				—			—			2,354
Other large-cap U.S. companies		34,345				—			—			34,345
International companies		555				—			—			555
Mutual fund equity investments:
U.S. equity index funds:
U.S. large-cap equity index funds		2,543				—			—			2,543
U.S. small-cap equity index funds		2,850				—			—			2,850
U.S. mid-cap equity index funds		3,911				—			—			3,911
Non-U.S. equities growth fund		10,783				—			—			10,783
U.S. equity funds:
U.S. mid-cap		7,919				—			—			7,919
U.S. small-cap		3,653				—			—			3,653
Other		4,469				—			—			4,469
Fixed income securities:
U.S. government agencies		—				44,653			—			44,653
Fixed income mutual funds:
U.S. investment-grade fixed income securities		10,196				—			—			10,196
Non-U.S. fixed income securities		473				—			—			473
	$	95,084			$	44,653			—		$	139,737
December 31, 2012
Asset Class
Cash	$	3,587			$	—			—		$	3,587
Equity securities:
F.N.B. Corporation		5,842				—			—			5,842
Other large-cap U.S. financial services companies		1,563				—			—			1,563
Other large-cap U.S. companies		27,709				—			—			27,709
International companies		624				—			—			624
Mutual fund equity investments:
U.S. equity index funds:
U.S. large-cap equity index funds		2,129				—			—			2,129
U.S. small-cap equity index funds		2,096				—			—			2,096
U.S. mid-cap equity index funds		2,928				—			—			2,928
Non-U.S. equities growth fund		8,972				—			—			8,972
U.S. equity funds:
U.S. mid-cap		5,893				—			—			5,893
U.S. small-cap		2,856				—			—			2,856
Other		4,280				—			—			4,280
Fixed income securities:
U.S. government agencies		—				36,030			—			36,030
Fixed income mutual funds:
U.S. investment-grade fixed income securities		8,404				—			—			8,404
Non-U.S. fixed income securities		503				—			—			503
	$	77,386			$	36,030			—		$	113,416
The classifications for Level 1, Level 2 and Level 3 are discussed in the Fair Value Measurements footnote.

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2013
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	17.    Income Taxes
	Income tax expense, allocated based on a separate tax return basis, consists of the following:
	Year Ended December 31	2013			2012			2011
	Current income taxes:
	Federal taxes	$	33,614		$	22,182		$	18,721
	State taxes		(116	)		416			354
			33,498			22,598			19,075
	Deferred income taxes:
	Federal taxes		11,258			21,175			12,929
	State taxes		—			—			—
			11,258			21,175			12,929
		$	44,756		$	43,773		$	32,004
	Income tax expense related to gains on the sale of securities was $283, $107 and $1,278 for 2013, 2012 and 2011, respectively.
	Income tax expense and the effective tax rate for 2013 were favorably impacted by $359 of uncertain tax positions reversed in the current period. The effective tax rates for 2013, 2012 and 2011 were all lower than the statutory tax rate due to tax benefits resulting from tax-exempt income on investments, loans, tax credits and income from BOLI.
	The following table provides a reconciliation between the statutory tax rate and the actual effective tax rate:
	Year Ended December 31	2013			2012			2011
	Statutory tax rate		35	%		35	%		35	%
	Effect of tax-free interest and dividend income		(4.3	)		(4.7	)		(5.9	)
	Tax credits and settlements		(2.4	)		(1.8	)		(1.9	)
	Life insurance		(0.4	)		—			—
	Other items		(0.4	)		(0.1	)		(0.3	)
	Actual effective tax rate		27.5	%		28.4	%		26.9	%
	The following table presents the tax effects of temporary differences that give rise to deferred tax assets and liabilities:
	December 31	2013			2012
	Deferred tax assets:
	Allowance for loan losses	$	39,292		$	36,714
	Discount on purchased loans		41,012			24,339
	Net operating loss/tax credit carryforwards		17,052			15,196
	Deferred compensation		8,208			7,429
	Securities impairments		20,371			19,999
	Pension and other defined benefit plans		2,190			16,335
	Net unrealized securities losses		13,295			—
	Other		3,567			4,268
	Total		144,987			124,280
	Valuation allowance		(15,611	)		(16,329	)
	Total deferred tax assets		129,376			107,951
	Deferred tax liabilities:
	Loan costs		(931	)		(287	)
	Depreciation		(9,819	)		(9,794	)
	Prepaid expenses		(1,261	)		(1,083	)
	Amortizable intangibles		(11,346	)		(8,200	)
	Lease financing		(6,290	)		(4,915	)
	Debt discharge income deferral		(3,402	)		—
	Originated mortgage servicing rights		(2,721	)		—
	Other		(1,214	)		(1,089	)
	Total deferred tax liabilities		(36,984	)		(25,368	)
	Net deferred tax assets	$	92,392		$	82,583
	The Corporation establishes a valuation allowance when it is more likely than not that the Corporation will not be able to realize the benefit of the deferred tax assets or when future deductibility is uncertain. Periodically, the valuation allowance is reviewed and adjusted based on management’s assessment of realizable deferred tax assets. At December 31, 2013, the Corporation had unused state net operating loss carryforwards expiring from 2018 to 2032. The Corporation anticipates that neither the state net operating loss carryforwards nor the other net deferred tax assets at certain of its subsidiaries will be utilized and, as such, has recorded a valuation allowance against the deferred tax assets related to these carryforwards.
	As of December 31, 2013 and 2012, the Corporation has approximately $660 and $1,088, respectively, of unrecognized tax benefits, excluding interest and the federal tax benefit of unrecognized state tax benefits. Also, as of December 31, 2013 and 2012, additional unrecognized tax benefits relating to accrued interest, net of the related federal tax benefit, amounted to $69 and $150, respectively. As of December 31, 2013, $498 of these tax benefits would affect the effective tax rate if recognized. The Corporation recognizes potential accrued interest and penalties related to unrecognized tax benefits in income tax expense. To the extent interest is not assessed with respect to uncertain tax positions, amounts accrued will be reduced and reflected as a reduction of the overall income tax provision.
	The Corporation files numerous consolidated and separate income tax returns in the U.S. federal jurisdiction and in several state jurisdictions. The Corporation is no longer subject to U.S. federal income tax examinations for years prior to 2010. Federal examinations for years 2009 and prior have been closed with no material impact to the Corporation’s financial position. With limited exception, the Corporation is no longer subject to state income tax examinations for years prior to 2009 and state income tax returns for 2009 through 2011 are currently subject to examination. The Corporation anticipates that a reduction in the unrecognized tax benefit of up to $408 may occur in the next twelve months from the expiration of statutes of limitations which would result in a reduction in income taxes.
	Unrecognized Tax Benefits
	A reconciliation of the beginning and ending amount of unrecognized tax benefits (excluding interest and the federal income tax benefit of unrecognized state tax benefits) is as follows:
	Year Ended December 31	2013			2012
	Balance at beginning of year	$	1,088		$	1,376
	Additions based on tax positions related to current year		74			87
	Additions based on tax positions of prior year		—			—
	Reductions for tax positions of prior years		—			—
	Reductions due to expiration of statute of limitations		(502	)		(375	)
	Balance at end of year	$	660		$	1,088

Comprehensive_Income

Comprehensive Income	12 Months Ended
	Dec. 31, 2013
Equity [Abstract]	'
Comprehensive Income	'
	18.    Comprehensive Income
	The following table presents changes in accumulated other comprehensive income, net of tax, by component:
	Year Ended December 31, 2013		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
	Balance at beginning of period		$	9,269		$	(8,039	)	$	(171	)	$	(47,283	)	$	(46,224	)
	Other comprehensive income (loss) before reclassifications			(20,643	)		1,847			(6,415	)		15,011			(10,200	)
	Amounts reclassified from accumulated other comprehensive income			(500	)		—			—			—			(500	)
	Net current period other comprehensive income (loss)			(21,143	)		1,847			(6,415	)		15,011			(10,700	)
	Balance at end of period		$	(11,874	)	$	(6,192	)	$	(6,586	)	$	(32,272	)	$	(56,924	)
	The following table presents a summary of the reclassifications out of accumulated other comprehensive income:
	Year Ended December 31, 2013
	Details About Accumulated Other		Amount			Affected Line Item
	Comprehensive Income Component		Reclassified  from			in the Statement
			Other			where Net Income
			Comprehensive			is Presented
			Income
	Unrealized net gains on securities available for sale (1)		$	(767	)	Net securities gains
				(267	)	Tax expense
			$	(500	)
	-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_Share

Earnings per Share	12 Months Ended
	Dec. 31, 2013
Earnings Per Share [Abstract]	'
Earnings per Share	'
	19.    Earnings per Share
	The following tables set forth the computation of basic and diluted earnings per common share:
	Year Ended December 31	2013		2012		2011
	Net income available to common stockholders	$	117,804	$	110,410	$	87,047
	Basic weighted average common shares outstanding		146,186,982		139,135,272		124,145,924
	Net effect of dilutive stock options, warrants, restricted stock and convertible debt		1,622,522		1,504,893		866,154
	Diluted weighted average common shares outstanding		147,809,504		140,640,165		125,012,078
	Basic earnings per common share	$	0.81	$	0.79	$	0.7
	Diluted earnings per common share	$	0.8	$	0.79	$	0.7
	For the years ended December 31, 2013, 2012 and 2011, 49,995, 172,709 and 392,299 shares of common stock, respectively, related to stock options and warrants were excluded from the computation of diluted earnings per 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 antidilutive.

Stockholders_Equity

Stockholders' Equity	12 Months Ended
	Dec. 31, 2013
Equity [Abstract]	'
Stockholders' Equity	'
	20.    Stockholders’ Equity
	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 combined offerings after deducting underwriting discounts and commissions and offering expenses were $161,316.

Regulatory_Matters

Regulatory Matters	12 Months Ended
	Dec. 31, 2013
Banking And Thrift [Abstract]	'
Regulatory Matters	'
	21.    Regulatory Matters
	The Corporation and FNBPA are subject to various regulatory capital requirements administered by the federal banking agencies. Quantitative measures established by regulators to ensure capital adequacy require the Corporation and FNBPA to maintain minimum amounts and ratios of total and tier 1 capital (as defined in the regulations) to risk-weighted assets (as defined) and of leverage ratio (as defined). Failure to meet minimum capital requirements can initiate certain mandatory, and possibly additional discretionary actions, by regulators that, if undertaken, could have a direct material effect on the Corporation’s consolidated financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Corporation and FNBPA must meet specific capital guidelines that involve quantitative measures of assets, liabilities and certain off-balance sheet items as calculated under regulatory accounting practices. The Corporation’s and FNBPA’s capital amounts and classifications are also subject to qualitative judgments by the regulators about components, risk weightings and other factors.
	The Corporation’s management believes that, as of December 31, 2013 and 2012, the Corporation and FNBPA met all capital adequacy requirements to which either of them was subject.
	As of December 31, 2013, the most recent notification from the federal banking agencies categorized the Corporation and FNBPA as well-capitalized under the regulatory framework for prompt corrective action. There are no conditions or events since the notification which management believes have changed this categorization.
	During June 2013, $15,000 of the Corporation-issued TPS were repurchased at a discount and the related debt extinguished. This $15,000 was opportunistically purchased at auction and represents a portion of the underlying collateral of a pooled TPS that was liquidated by the trustee. During December 2013, the Corporation redeemed $115,000 of the Corporation-issued TPS in conjunction with its capital raise completed in November 2013. The regulatory capital ratios at December 31, 2013 reflect these decreases in TPS, with remaining TPS included in tier 1 capital totaling $74,000.
	Following are the capital ratios as of December 31, 2013 and 2012 for the Corporation and FNBPA (dollars in thousands):
		Actual					Well-Capitalized					Minimum  Capital
							Requirements					Requirements
	December 31, 2013	Amount		Ratio			Amount		Ratio			Amount		Ratio
	F.N.B. Corporation:
	Total capital to risk-weighted assets	$	1,258,312		12.5	%	$	1,009,952		10	%	$	807,962		8	%
	Tier 1 capital to risk-weighted assets		1,117,956		11.1			605,971		6			403,981		4
	Leverage ratio		1,117,956		8.8			634,527		5			507,622		4
	FNBPA:
	Total capital to risk-weighted assets		1,144,510		11.5			995,524		10			796,419		8
	Tier 1 capital to risk-weighted assets		1,035,659		10.4			597,314		6			398,210		4
	Leverage ratio		1,035,659		8.3			623,921		5			499,137		4
	December 31, 2012
	F.N.B. Corporation:
	Total capital to risk-weighted assets	$	1,068,704		12.2	%	$	879,316		10	%	$	703,453		8	%
	Tier 1 capital to risk-weighted assets		934,443		10.6			527,589		6			351,726		4
	Leverage ratio		934,443		8.3			563,649		5			450,919		4
	FNBPA:
	Total capital to risk-weighted assets		999,717		11.6			859,468		10			687,574		8
	Tier 1 capital to risk-weighted assets		895,177		10.4			515,681		6			343,787		4
	Leverage ratio		895,177		8.1			555,360		5			444,288		4
	FNBPA was required to maintain aggregate cash reserves with the FRB amounting to $18,679 at December 31, 2013. The Corporation also maintains deposits for various services such as check clearing.
	Certain limitations exist under applicable law and regulations by regulatory agencies regarding dividend distributions to a parent by its subsidiaries. As of December 31, 2013, the Corporation’s subsidiaries had $116,806 of retained earnings available for distribution to the Corporation without prior regulatory approval.
	Under current FRB regulations, FNBPA is limited in the amount it may lend to non-bank affiliates, including the Corporation. Such loans must be secured by specified collateral. In addition, any such loans to a non-bank affiliate may not exceed 10% of FNBPA’s capital and surplus and the aggregate of loans to all such affiliates may not exceed 20% of FNBPA’s capital and surplus. The maximum amount that may be borrowed by the Corporation under these provisions was $182,499 at December 31, 2013.

Cash_Flow_Information

Cash Flow Information	12 Months Ended
	Dec. 31, 2013
Supplemental Cash Flow Elements [Abstract]	'
Cash Flow Information	'
	22.    Cash Flow Information
	Following is a summary of cash flow information:
	Year Ended December 31	2013		2012		2011
	Interest paid on deposits and other borrowings	$	46,337	$	56,306	$	75,178
	Income taxes paid		34,200		22,250		13,250
	Transfers of loans to other real estate owned		15,836		14,102		21,679
	Transfers of other real estate owned to loans		701		839		598
	Supplemental non-cash information relating to the Corporation’s acquisitions is included in the Mergers and Acquisitions footnote included in this Item of the Report.

Business_Segments

Business Segments	12 Months Ended
	Dec. 31, 2013
Segment Reporting [Abstract]	'
Business Segments	'
	23.    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			Consolidated
			Banking		Manage-				Finance		and
					ment						Other
	At or for the Year Ended December 31, 2013
	Interest income		$	396,243	$	—	$	109	$	37,956	$	6,078		$	440,386
	Interest expense			32,178		—		—		3,378		8,788			44,344
	Net interest income			364,065		—		109		34,578		(2,710	)		396,042
	Provision for loan losses			23,502		—		—		6,834		754			31,090
	Non-interest income			97,156		28,717		13,175		2,794		(6,064	)		135,778
	Non-interest expense			271,657		25,067		11,448		19,052		2,539			329,763
	Intangible amortization			7,697		304		406		—		—			8,407
	Income tax expense (benefit)			43,966		1,248		519		4,320		(5,297	)		44,756
	Net income (loss)			114,399		2,098		911		7,166		(6,770	)		117,804
	Total assets			13,381,047		20,959		20,214		188,259		(47,074	)		13,563,405
	Total intangibles			788,513		11,008		10,526		1,809		—			811,856
	At or for the Year Ended December 31, 2012
	Interest income		$	390,680	$	4	$	113	$	35,279	$	5,830		$	431,906
	Interest expense			45,604		—		—		3,584		9,867			59,055
	Net interest income			345,076		4		113		31,695		(4,037	)		372,851
	Provision for loan losses			24,606		—		—		6,115		581			31,302
	Non-interest income			96,853		24,152		13,035		2,343		(5,131	)		131,252
	Non-interest expense			258,063		20,141		11,503		18,410		1,577			309,694
	Intangible amortization			8,184		320		420		—		—			8,924
	Income tax expense (benefit)			42,991		1,358		438		3,615		(4,629	)		43,773
	Net income (loss)			108,085		2,337		787		5,898		(6,697	)		110,410
	Total assets			11,845,122		19,610		18,675		178,149		(37,580	)		12,023,976
	Total intangibles			689,354		11,312		10,931		1,809		—			713,406
	At or for the Year Ended December 31, 2011
	Interest income		$	350,801	$	11	$	124	$	34,168	$	6,021		$	391,125
	Interest expense			60,132		—		—		4,281		10,204			74,617
	Net interest income			290,669		11		124		29,887		(4,183	)		316,508
	Provision for loan losses			26,957		—		—		6,152		532			33,641
	Non-interest income			88,172		23,238		12,325		2,132		(6,137	)		119,730
	Non-interest expense			227,696		18,518		11,568		17,210		1,514			276,506
	Intangible amortization			6,279		335		426		—		—			7,040
	Income tax expense (benefit)			31,869		1,587		169		3,274		(4,895	)		32,004
	Net income (loss)			86,040		2,809		286		5,383		(7,471	)		87,047
	Total assets			9,583,439		19,579		17,301		171,350		(5,186	)		9,786,483
	Total intangibles			574,622		11,632		11,352		1,809		—			599,415

Fair_Value_Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2013
Fair Value Disclosures [Abstract]	'
Fair Value Measurements	'
	24.    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 December 31, 2013, 97% 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 3% of these securities were measured using model-based 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 information for a sample of securities provided by the independent pricing service by Corporate personnel familiar with market liquidity and other market-related conditions.
	The Corporation determines the valuation of its investments in pooled TPS with the assistance of a third-party independent financial consulting firm that specializes in advisory services related to illiquid financial investments. The consulting firm provides the Corporation appropriate valuation methodology, performance assumptions, modeling techniques, discounted cash flows, discount rates using the underlying index plus 4.5-14%, and sensitivity analyses with respect to levels of defaults and deferrals necessary to produce losses.
	Additionally, the Corporation utilizes the firm’s expertise to reassess assumptions to reflect actual conditions. See the Securities footnote in the Notes to Consolidated Financial Statements section of this Report for information on how the Corporation reassesses assumptions to determine the valuation of its pooled TPS. Accessing the services of a financial consulting firm with a focus on financial instruments assists the Corporation in accurately valuing these complex financial instruments and facilitates informed decision-making with respect to such instruments.
	The Level 3 CDOs could be subject to sensitivities in market risks that may cause the discount rates on these instruments to vary from those currently utilized to determine fair value. These discount rates vary today, but typically range between 4.5-14% over the coupon rate of the specific security. The valuations are somewhat sensitive to changes in the discount rate. For example, each 1% change in the discount rate will alter the fair value of these debt obligations by approximately $3,000 or 7% of the total book value. Factors that could influence the discount rate include: the overall health of the economy, the current and projected health of the banking system and its impact upon banks’ capital strategies, access to capital markets for the underlying debt issuers and regulatory matters. Generally, in an improving economy the health of the banking system should be improving and capital market access would be open, thus reducing market risk premiums and therefore discount rates for these instruments. Conversely, the opposite is true, a weakening economy puts pressure on the banking system and the financial health of banks. The Corporation takes all these factors into consideration when establishing a fair value for these Level 3 obligations.
	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 December 31, 2013, 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 fair 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
	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
		Level 1			Level 2			Level 3			Total
	December 31, 2012
	Assets measured at fair value
Available for sale debt securities
U.S. government-sponsored entities	$	—		$	354,457		$	—		$	354,457
Residential mortgage-backed securities
Agency mortgage-backed securities		—			275,150			—			275,150
Agency collateralized mortgage obligations		—			469,547			—			469,547
Non-agency collateralized mortgage obligations		—			24			2,705			2,729
States of the U.S. and political subdivisions		—			24,824			—			24,824
Collateralized debt obligations		—			—			22,456			22,456
Other debt securities		—			14,621			6,892			21,513
		—			1,138,623			32,053			1,170,676
Available for sale equity securities
Financial services industry		351			1,099			512			1,962
Insurance services industry		45			—			—			45
		396			1,099			512			2,007
		396			1,139,722			32,565			1,172,683
Derivative financial instruments
Trading		—			58,008			—			58,008
Not for trading		—			—			—			—
		—			58,008			—			58,008
	$	396		$	1,197,730		$	32,565		$	1,230,691
Liabilities measured at fair value
Derivative financial instruments
Trading		—		$	58,150			—		$	58,150
Not for trading		—			—			—			—
		—		$	58,150			—		$	58,150
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. There were no transfers of assets or liabilities between the hierarchy levels for 2012.
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
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
Year Ended December 31, 2012
Balance at beginning of period	$	5,998		$	5,197		$	408		$	—		$	11,603
Total gains (losses) – realized/unrealized:
Included in earnings		—			—			—			—			—
Included in other comprehensive income		917			732			104			49			1,802
Accretion included in earnings		2,515			9			—			20			2,544
Purchases, issuances, sales and settlements:
Purchases		16,569			954			—			4,230			21,753
Issuances		46			—			—			—			46
Sales/redemptions		(2,542	)		—			—			—			(2,542	)
Settlements		(1,047	)		—			—			(1,594	)		(2,641	)
Transfers from Level 3		—			—			—			—			—
Transfers into Level 3		—			—			—			—			—
Balance at end of period	$	22,456		$	6,892		$	512		$	2,705		$	32,565
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 years ended December 31, 2013 and 2012, the amount of total losses included in earnings attributable to the change in unrealized gains or losses relating to assets still held as of the end of the year was $27 and $212, respectively. These losses are included in net impairment losses on securities reported as a component of non-interest 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 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 in the balance sheet, the following table provides the hierarchy level and the fair value of the related assets or portfolios. These amounts represent the fair values at the time the non-recurring fair value measurements were made, and not necessarily the fair value as of the dates reported upon.
	Level 1			Level 2			Level 3			Total
December 31, 2013
Impaired loans		—		$	3,235		$	59		$	3,294
Other real estate owned		—			4,485			14,957			19,442
December 31, 2012
Impaired loans		—		$	14,325		$	3,171		$	17,496
Other real estate owned		—			5,771			13,540			19,311
Investment security, held-to-maturity:
Non-agency CMO		—			—			3,636			3,636
Impaired loans measured or re-measured at fair value on a non-recurring basis during 2013 had a carrying amount of $3,728 and an allocated allowance for loan losses of $825 at December 31, 2013. The allocated allowance is based on fair value of $3,294 less estimated costs to sell of $391. The allowance for loan losses includes a provision applicable to the current period fair value measurements of $257, which was included in the provision for loan losses for 2013.
OREO with a carrying amount of $20,830 was written down to $17,060 (fair value of $19,442 less estimated costs to sell of $2,381), resulting in a loss of $3,770, which was included in earnings for 2013.
The investment security held-to-maturity as of December 31, 2012 represents a non-agency CMO where OTTI had been identified and the investment had been adjusted to fair value. This security was sold during the first quarter of 2013.
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 December 31, 2013, 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 Value			Level 1			Level 2			Level 3
	Amount
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		9,402,448			9,243,780			—			—			9,243,780
held for sale
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			—			—
December 31, 2012
Financial Assets
Cash and cash equivalents	$	239,044		$	239,044		$	239,044		$	—		$	—
Securities available for sale		1,172,683			1,172,683			396			1,139,722			32,565
Securities held to maturity		1,106,563			1,143,213			—			1,128,524			14,689
Net loans, including loans		8,061,096			7,996,554			—			—			7,966,554
held for sale
Bank owned life insurance		246,088			257,060			257,060			—			—
Derivative assets		58,008			58,008			—			58,008			—
Accrued interest receivable		30,210			30,210			30,210			—			—
Financial Liabilities
Deposits		9,082,174			9,117,757			6,546,316			2,571,441			—
Short-term borrowings		1,083,138			1,083,138			1,083,138			—			—
Long-term debt		89,425			92,329			—			—			92,329
Junior subordinated debt		204,019			172,246			—			—			172,246
Derivative liabilities		58,150			58,150			—			58,150			—
Accrued interest payable		9,054			9,054			9,054			—			—

Parent_Company_Financial_State

Parent Company Financial Statements	12 Months Ended
	Dec. 31, 2013
Condensed Financial Information Of Parent Company Only Disclosure [Abstract]	'
Parent Company Financial Statements	'
	25.    Parent Company Financial Statements
	The following is condensed financial information of F.N.B. Corporation (parent company only). In this information, the parent company’s investments in subsidiaries are stated at cost plus equity in undistributed earnings of subsidiaries since acquisition. This information should be read in conjunction with the consolidated financial statements.
	Balance Sheets	2013			2012
	December 31
	Assets
	Cash and cash equivalents	$	145,910		$	114,654
	Securities available for sale		2,061			1,962
	Other assets		18,387			15,856
	Investment in bank subsidiary		1,759,551			1,554,543
	Investments in and advances to non-bank subsidiaries		254,124			253,807
	Total Assets	$	2,180,033		$	1,940,822
	Liabilities
	Other liabilities	$	25,225		$	28,381
	Advances from affiliates		294,245			295,100
	Junior subordinated debt		76,290			205,156
	Subordinated notes:
	Short-term		8,439			8,355
	Long-term		1,451			1,761
	Total Liabilities		405,650			538,753
	Stockholders’ Equity		1,774,383			1,402,069
	Total Liabilities and Stockholders’ Equity	$	2,180,033		$	1,940,822
	Statements of Income	2013			2012			2011
	Year Ended December 31
	Income
	Dividend income from subsidiaries:
	Bank	$	77,153		$	74,412		$	65,130
	Non-bank		5,950			6,400			8,638
			83,103			80,812			73,768
	Interest income		5,277			5,802			6,172
	Other income		1,874			1,442			71
	Total Income		90,254			88,056			80,011
	Expenses
	Interest expense		14,325			15,646			16,744
	Other expenses		8,196			7,640			6,197
	Total Expenses		22,521			23,286			22,941
	Income Before Taxes and Equity in Undistributed Income of Subsidiaries		67,733			64,770			57,070
	Income tax benefit		6,267			6,151			6,296
			74,000			70,921			63,366
	Equity in undistributed income (loss) of subsidiaries:
	Bank		42,094			38,401			25,508
	Non-bank		1,710			1,088			(1,827	)
	Net Income	$	117,804		$	110,410		$	87,047
	Statements of Cash Flows	2013			2012			2011
	Year Ended December 31
	Operating Activities
	Net income	$	117,804		$	110,410		$	87,047
	Adjustments to reconcile net income to net cash flows from operating activities:
	Undistributed earnings from subsidiaries		(43,804	)		(39,489	)		(23,681	)
	Other, net		(6,218	)		109			8,666
	Net cash flows provided by operating activities		67,782			71,030			72,032
	Investing Activities
	Proceeds from sale of securities available for sale		128			201			389
	(Increase) decrease in property, plant and equipment		—			4,193			(243	)
	Net decrease (increase) in advances to subsidiaries		1,080			(1,349	)		(7,551	)
	Net increase in investment in subsidiaries		(1,688	)		(79,450	)		(16,611	)
	Net cash flows used in investing activities		(480	)		(76,405	)		(24,016	)
	Financing Activities
	Net (decrease) increase in advance from affiliate		(854	)		12,944			16,900
	Net increase (decrease) in short-term borrowings		84			(2	)		(316	)
	Decrease in long-term debt		(808	)		(1,277	)		(1,206	)
	Increase in long-term debt		499			671			798
	Decrease in junior subordinated debt		(134,021	)		—			—
	Net proceeds from issuance of preferred stock		106,882			—			—
Net proceeds from issuance of common stock		62,092			8,895			71,053
Tax benefit (expense) of stock-based compensation		1,326			386			(61	)
Cash dividends paid		(71,246	)		(67,646	)		(60,686	)
Net cash flows (used in) provided by financing activities		(36,046	)		(46,029	)		26,482
Net Increase (Decrease) in Cash and Cash Equivalents		31,256			(51,404	)		74,498
Cash and cash equivalents at beginning of year		114,654			166,058			91,560
Cash and Cash Equivalents at End of Year	$	145,910		$	114,654		$	166,058
Cash paid during the year for:
Interest	$	14,345		$	15,690		$	16,768

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2013
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, F.N.B. Capital Corporation, LLC 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).
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.
Business Combinations	'
	Business Combinations
	Business combinations are accounted for by applying the acquisition method in accordance with Accounting Standards Codification (ASC) 805, Business Combinations. Under the acquisition method, identifiable assets acquired and liabilities assumed, and any non-controlling interest in the acquiree at the acquisition date are measured at their fair values as of that date, and are recognized separately from goodwill. Results of operations of the acquired entities are included in the consolidated statement of income from the date of acquisition.
Cash Equivalents	'
	Cash Equivalents
	The Corporation considers cash and demand balances due from banks as cash and cash equivalents.
Securities	'
	Securities
	Investment securities, which consist of debt securities and certain equity securities, comprise a significant portion of the Corporation’s consolidated balance sheet. Such securities can be classified as “trading,” “securities held to maturity” or “securities available for sale.”
	Securities are classified as trading securities when management intends to sell such securities in the near term and are carried at fair value, with unrealized gains (losses) reflected through the consolidated statement of income. The Corporation acquired securities in conjunction with acquisitions during 2013 and 2012 that the Corporation classified as trading securities. The Corporation both acquired and sold these trading securities during the quarters in which each of the acquisitions occurred. As of December 31, 2013 and 2012, the Corporation did not hold any trading securities.
	Securities held to maturity are comprised of debt securities, for which management has the positive intent and ability to hold such securities until their maturity. Such securities are carried at cost, adjusted for related amortization of premiums and accretion of discounts through interest income from securities, and other-than-temporary impairment (OTTI), if any.
	Securities that are not classified as trading or held to maturity are classified as available for sale. The Corporation’s available for sale securities portfolio is comprised of debt securities and marketable equity securities. Such securities are carried at fair value with net unrealized gains and losses deemed to be temporary and unrealized losses deemed to be other-than-temporary and attributable to non-credit factors reported separately as a component of other comprehensive income, net of tax. Realized gains and losses on the sale of available for sale securities and credit-related OTTI charges are recorded within non-interest income in the consolidated statement of income. Realized gains and losses on the sale of securities are determined using the specific-identification method.
	The Corporation evaluates its investment securities portfolio for 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.
	When impairment of an equity security is considered to be other-than-temporary, the security is written down to its fair value and an impairment loss is recorded as a loss within non-interest income in the consolidated statement of income. When impairment of a debt security is considered to be other-than-temporary, the amount of the OTTI recorded as a loss within non-interest income and thereby recognized in earnings depends on whether the Corporation intends to sell the security or whether it is more likely than not that the Corporation will be required to sell the security before recovery of its amortized cost basis.
	If the Corporation intends to sell the debt security or more likely than not will be required to sell the security before recovery of its amortized cost basis, OTTI shall be recognized in earnings equal to the entire difference between the investment’s amortized cost basis and its fair value.
	If the Corporation does not intend to sell the debt security and it is not more likely than not the Corporation will be required to sell the security before recovery of its amortized cost basis, OTTI shall be separated into the amount representing credit loss and the amount related to all other market factors. The amount related to credit loss shall be recognized in earnings. The amount related to other market factors shall be recognized in other comprehensive income, net of applicable taxes.
	The Corporation performs its OTTI evaluation process in a consistent and systematic manner and includes an evaluation of all available evidence. Documentation of the process is as extensive as necessary to support a conclusion as to whether a decline in fair value below cost or amortized cost is temporary or other-than-temporary and includes documentation supporting both observable and unobservable inputs and a rationale for conclusions reached. In making these determinations for pooled trust preferred securities (TPS), the Corporation consults with third-party advisory firms to provide additional valuation assistance.
	This process considers factors such as the severity, length of time and anticipated recovery period of the impairment, recoveries or additional declines in fair value subsequent to the balance sheet date, recent events specific to the issuer, including investment downgrades by rating agencies and economic conditions in its industry, and the issuer’s financial condition, repayment capacity, capital strength and near-term prospects.
	For debt securities, the Corporation also considers the payment structure of the debt security, the likelihood of the issuer being able to make future payments, failure of the issuer of the security to make scheduled interest and principal payments, whether the Corporation has made a decision to sell the security and whether the Corporation’s cash or working capital requirements or contractual or regulatory obligations indicate that the debt security will be required to be sold before a forecasted recovery occurs. For equity securities, the Corporation also considers its intent and ability to retain the security for a period of time sufficient to allow for a recovery in fair value. Among the factors that the Corporation considers in determining its intent and ability to retain the security is a review of its capital adequacy, interest rate risk position and liquidity. The assessment of a security’s ability to recover any decline in fair value, the ability of the issuer to meet contractual obligations, the Corporation’s intent and ability to retain the security, and whether it is more likely than not the Corporation will be required to sell the security before recovery of its amortized cost basis require considerable judgment.
	Debt securities with credit ratings below AA at the time of purchase that are repayment-sensitive securities are evaluated using the guidance of ASC 325, Investments – Other. All other securities are required to be evaluated under ASC 320, Investments – Debt Securities.
Securities Sold Under Agreements to Repurchase	'
	Securities Sold Under Agreements to Repurchase
	Securities sold under agreements to repurchase are accounted for as collateralized financing transactions and are recorded at the amounts at which the securities were sold plus accrued interest. Securities, generally U.S. government and federal agency securities, pledged as collateral under these financing arrangements cannot be sold or repledged by the secured party. The fair value of collateral either received from or provided to a third party is continually monitored and additional collateral is obtained or is requested to be returned to the Corporation as deemed appropriate.
Derivative Instruments and Hedging Activities	'
	Derivative Instruments and Hedging Activities
	From time to time, the Corporation may enter into derivative transactions principally to protect against the risk of adverse price or interest rate movements on the value of certain assets and liabilities and on future cash flows. The Corporation formally documents all relationships between hedging instruments and hedged items, as well as its risk management objective and strategy for undertaking each hedge transaction. All derivative instruments are carried at fair value on the balance sheet in accordance with the requirements of ASC 815, Derivatives and Hedging.
	Cash flow hedges are accounted for by recording the fair value of the derivative instrument on the balance sheet as either a freestanding asset or liability, with a corresponding offset recorded in accumulated other comprehensive income, net of tax. Amounts are reclassified from accumulated other comprehensive income to the consolidated statement of income in the period or periods in which the hedged transaction affects earnings.
	Derivative gains and losses under cash flow hedges not effective in hedging the change in fair value or expected cash flows of the hedged item are recognized immediately in the consolidated statement of income. At the hedge’s inception and at least quarterly thereafter, a formal assessment is performed to determine whether changes in the fair values or cash flows of the derivative instruments have been highly effective in offsetting changes in fair values or cash flows of the hedged items and whether they are expected to be highly effective in the future. If it is determined a derivative instrument has not been or will not continue to be highly effective as a hedge, hedge accounting is discontinued.
	In addition, 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. 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.
Mortgage Loans Held for Sale and Loan Commitments	'
	Mortgage Loans Held for Sale and Loan Commitments
	Certain residential mortgage loans are originated for sale in the secondary mortgage loan market and typically sold with servicing rights released. These loans are classified as loans held for sale and are carried at the lower of cost or estimated market value on an aggregate basis. Market value is determined on the basis of rates obtained in the respective secondary market for the type of loan held for sale. Loans are generally sold at a premium or discount from the carrying amount of the loan. Such premium or discount is recognized at the date of sale. Gain or loss on the sale of loans is recorded in non-interest income at the time consideration is received and all other criteria for sales treatment have been met.
	The Corporation routinely issues commitments to make loans that it intends to sell. These commitments are considered derivatives. The Corporation also enters into commitments to sell loans to mitigate the risk that the market value of residential loans may decline between the time the rate commitment is issued to the customer and the time the Corporation contracts to sell the loan. These commitments and sales contracts are also derivatives. Both types of derivatives are recorded at fair value. Sales contracts and commitments to sell loans are not designated as hedges of the fair value of loans held for sale. Fair value adjustments related to derivatives are recorded in current period earnings as part of mortgage banking income.
Loans (Excluding Acquired Loans)	'
	Loans (Excluding Acquired Loans)
	Loans the Corporation originates and intends to hold for the foreseeable future or until maturity or payoff are reported at their net book balances, net of any deferred origination fees or costs. Interest income on loans is computed over the term of the loans using the effective interest method. Loan origination fees and certain direct costs incurred to extend credit are deferred and amortized over the term of the loan or loan commitment period as an adjustment to the related loan yield.
Non-performing Loans	'
	Non-performing Loans
	Interest is not accrued on loans where collectibility is uncertain. The Corporation 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. Past due status is based on the contractual terms of the loan.
	When a loan is placed on non-accrual status, all unpaid interest is reversed. Payments subsequently received are generally applied to either principal or interest or both, depending on management’s evaluation of collectibility. A loan is returned to accrual status when principal and interest are no longer past due and collectibility is probable. This generally requires a sustained period of timely principal and interest payments.
	Loans are generally written off when deemed uncollectible or when they reach a predetermined number of days past due depending upon loan product, terms, and other factors. Recoveries of amounts previously charged off are credited to the allowance for loan losses.
	The Corporation considers a loan impaired when, based on current information and events, it is probable that the Corporation will be unable to collect the scheduled payments of principal or interest when due according to the contractual terms of the loan agreement. Factors considered in determining impairment include payment status, collateral value and the probability of collecting scheduled principal and interest payments when due. The impairment loss is measured by either the present value of expected future cash flows discounted at the loan’s effective interest rate, the loan’s obtainable market price, or the fair value of the collateral, less estimated selling costs, if the loan is collateral dependent. Acquired impaired loans are not classified as non-performing assets as the loans are considered to be performing under the provisions of ASC 310-30,Loans and Debt Securities Acquired with Deteriorated Credit Quality.
	Restructured loans are those in which concessions of terms have been made as a result of deterioration in a borrower’s financial condition. In general, the modification or restructuring of a debt constitutes a troubled debt restructuring (TDR) if the Corporation for economic or legal reasons related to the borrower’s financial difficulties grants a concession to the borrower that the Corporation would not otherwise consider under current market conditions. Debt restructurings or loan modifications for a borrower occur during the normal course of business and do not necessarily constitute TDRs. To designate a loan as a TDR, the presence of both borrower financial distress and a concession of terms must exist. Additionally, a loan designated as a TDR does not necessarily result in the automatic placement of the loan on non-accrual status. When the full collection of principal and interest is reasonably assured on a loan designated as a TDR and the borrower does not otherwise meet the criteria for non-accrual status, the Corporation will continue to accrue interest on the loan.
	In accordance with ASC 310-40, a restructured acquired loan that is accounted for as a component of a pool in accordance with ASC 310-30 is not considered a TDR.
Allowance for Loan Losses	'
	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 uncollectibility of a loan balance is confirmed. Subsequent recoveries, if any, are credited to the allowance for loan losses. Allowances for impaired loans are generally determined based on collateral values or the present value of estimated cash flows. 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 historical loss experience and consideration of current environmental factors and economic trends, 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.
Acquired Loans	'
	Acquired Loans
	Acquired loans (impaired and non-impaired) are initially recorded at their acquisition-date fair values. Fair values are based on a discounted cash flow methodology that involves assumptions and judgments as to credit risk, default rates, loss severity, collateral values, discount rates, payment speeds, prepayment risk, and liquidity risk.
	The carryover of allowance for loan losses related to acquired loans is prohibited as any credit losses in the loans are included in the determination of the fair value of the loans at the acquisition date. The allowance for loan losses on acquired loans reflects only those losses incurred after acquisition and represents the present value of cash flows expected at acquisition that is no longer expected to be collected.
	At acquisition, the Corporation considers the following factors as indicators that an acquired loan has evidence of deterioration in credit quality and is therefore impaired and in the scope of ASC 310-30:
		•	loans that were 90 days or more past due;
		•	loans that had an internal risk rating of substandard or worse. Substandard is consistent with regulatory definitions and is defined as having a well-defined weakness that jeopardizes liquidation of the loan;
		•	loans that were classified as non-accrual by the acquired bank at the time of acquisition; or
		•	loans that had been previously modified in a TDR.
	Any acquired loans that were not individually in the scope of ASC 310-30 because they didn’t meet the criteria above were pooled into groups of similar loans based on various factors including borrower type, loan purpose, and collateral type. For these pools, the Corporation used certain loan information, including outstanding principal balance, estimated expected losses, weighted average maturity, weighted average margin, and weighted average interest rate along with estimated prepayment rates, probability of default and loss given default to estimate the expected cash flow for each loan pool.
	Pursuant to an American Institute of CPAs (AICPA) letter dated December 18, 2009, the AICPA summarized the SEC staff’s view regarding accounting in subsequent periods for discount accretion associated with acquired loan receivables that are not required to be accounted for in accordance with ASC 310-30. The AICPA understands that, in the absence of further standard setting, the SEC staff would not object to an accounting policy based on contractual cash flows (ASC 310-20 approach) or an accounting policy based on expected cash flows (ASC 310-30 approach). The Corporation believes analogizing to ASC 310-30 is the more appropriate option to follow in accounting for discount accretion on non-impaired acquired loans other than revolving loans and therefore accounts for such loans in accordance with ASC 310-30. ASC 310-30 guidance does not apply to revolving loans. Consequently, discount accretion on revolving loans acquired is accounted for using the ASC 310-20 approach.
	The excess of cash flows expected to be collected at acquisition over recorded fair value is referred to as the accretable yield. The accretable yield is recognized into income over the remaining life of the loan if the timing and/or amount of cash flows expected to be collected can be reasonably estimated (the accretion model). If the timing and/or amount of cash flows expected to be collected cannot be reasonably estimated, the cost recovery method of income recognition must be used. The difference between the loan’s total scheduled principal and interest payments over all cash flows expected at acquisition is referred to as the non-accretable difference. The non-accretable difference represents contractually required principal and interest payments which the Corporation does not expect to collect.
	Over the life of the acquired loan, the Corporation continues to estimate cash flows expected to be collected. Decreases in expected cash flows, other than from prepayments or rate adjustments, are recognized as impairments through a charge to the provision for loan losses resulting in an increase in the allowance for loan losses. Subsequent improvements in cash flows result in first, reversal of existing valuation allowances recognized subsequent to acquisition, if any, and next, an increase in the amount of accretable yield to be subsequently recognized on a prospective basis over the loan’s remaining life.
	Acquired loans that met the criteria for non-accrual of interest prior to acquisition are considered performing upon acquisition, regardless of whether the customer is contractually delinquent, if the Corporation can reasonably estimate the timing and amount of expected cash flows on such loans. Accordingly, the Corporation does not consider acquired contractually delinquent loans to be non-accrual or non-performing and continues to recognize interest income on these loans using the accretion model.
Premises and Equipment	'
	Premises and Equipment
	Premises and equipment are stated at cost less accumulated depreciation. Depreciation is computed using the straight-line method over the asset’s estimated useful life. Leasehold improvements are expensed over the lesser of the asset’s estimated useful life or the term of the lease including renewal periods when reasonably assured. Useful lives are dependent upon the nature and condition of the asset and range from 3 to 40 years. Maintenance and repairs are charged to expense as incurred, while major improvements are capitalized and amortized to operating expense over the identified useful life.
Other Real Estate Owned	'
	Other Real Estate Owned
	Other real estate owned (OREO) is comprised principally of commercial and residential real estate properties obtained in partial or total satisfaction of loan obligations. OREO acquired in settlement of indebtedness is included in other assets initially at the lower of estimated fair value of the asset less estimated selling costs or the carrying amount of the loan. Changes to the value subsequent to transfer are recorded in non-interest expense along with direct operating expenses. Gains or losses not previously recognized resulting from sales of OREO are recognized in non-interest expense on the date of sale.
Goodwill and Other Intangible Assets	'
	Goodwill and Other Intangible Assets
	Goodwill represents the excess of the cost of an acquisition over the fair value of the net assets acquired. Other intangible assets represent purchased assets that lack physical substance but can be distinguished from goodwill because of contractual or other legal rights. Intangible assets that have finite lives, such as core deposit intangibles, customer relationship intangibles and renewal lists, are amortized over their estimated useful lives and subject to periodic impairment testing. Core deposit intangibles are primarily amortized over ten years using straight line and accelerated methods. Customer and renewal lists and other intangible assets are amortized over their estimated useful lives which range from ten to twelve years.
	Goodwill and other intangibles are subject to impairment testing at the reporting unit level, which must be conducted at least annually. The Corporation performs impairment testing during the fourth quarter of each year. Due to ongoing uncertainty regarding market conditions surrounding the banking industry, the Corporation continues to monitor goodwill and other intangibles for impairment and to evaluate carrying amounts, as necessary.
	The Corporation performs a qualitative assessment to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If, after assessing updated qualitative factors, the Corporation determines it is not more likely than not that the fair value of a reporting unit is less than its carrying amount, it does not have to perform the two-step goodwill impairment test. Determining the fair value of a reporting unit under the first step of the goodwill impairment test and determining the fair value of individual assets and liabilities of a reporting unit under the second step of the goodwill impairment test are judgmental and often involve the use of significant estimates and assumptions. Similarly, estimates and assumptions are used in determining the fair value of other intangible assets. Estimates of fair value are primarily determined using discounted cash flows, market comparisons and recent transactions. These approaches use significant estimates and assumptions including projected future cash flows, discount rates reflecting the market rate of return, projected growth rates and determination and evaluation of appropriate market comparables. Based on the results of quantitative assessments of all reporting units, the Corporation concluded that no impairment existed at December 31, 2013. However, future events could cause the Corporation to conclude that goodwill or other intangibles have become impaired, which would result in recording an impairment loss. Any resulting impairment loss could have a material adverse impact on the Corporation’s financial condition and results of operations.
Income Taxes	'
	Income Taxes
	The Corporation files a consolidated federal income tax return. The provision for federal and state income taxes is based on income reported on the consolidated financial statements, rather than the amounts reported on the respective income tax returns. Deferred tax assets and liabilities are computed using tax rates expected to apply to taxable income in the years in which those assets and liabilities are expected to be realized. The effect on deferred tax assets and liabilities resulting from a change in tax rates is recognized as income or expense in the period that the change in tax rates is enacted.
	The Corporation makes certain estimates and judgments in determining income tax expense for financial statement purposes. These estimates and judgments are applied in the calculation of certain tax credits and in the calculation of the deferred income tax expense or benefit associated with certain deferred tax assets and liabilities. Significant changes to these estimates may result in an increase or decrease to the Corporation’s tax provision in a subsequent period. The Corporation recognizes interest and/or penalties related to income tax matters in income tax expense.
	The Corporation assesses the likelihood that it will be able to recover its deferred tax assets. If recovery is not likely, the Corporation will increase its provision for income taxes by recording a valuation allowance against the deferred tax assets that are unlikely to be recovered. The Corporation believes that it will ultimately recover a substantial majority of the deferred tax assets recorded on the balance sheet. However, should there be a change in the Corporation’s ability to recover its deferred tax assets, the effect of this change would be recorded through the provision for income taxes in the period during which such change occurs.
	The Corporation periodically reviews the tax positions it takes on its tax return and applies a more likely than not recognition threshold for all tax positions that are uncertain. The amount recognized in the financial statements is the largest amount of tax benefit that is greater than 50% likely of being realized on examination. For tax positions not meeting the more likely than not test, no tax benefit is recorded.
Advertising and Promotional Costs	'
	Advertising and Promotional Costs
	Advertising and promotional costs are generally expensed as incurred.
Per Share Amounts	'
	Per Share Amounts
	Earnings per common share is computed using net income available to common stockholders, which is net income adjusted for preferred stock dividends.
	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 adjusted for interest expense on convertible debt 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 net income available to common stockholders and the weighted average number of shares of common stock outstanding are made only when such adjustments dilute earnings per common share.
Pension Plans	'
	Pension Plans
	The Corporation sponsors pension plans for its employees. The expense associated with the plans is calculated in accordance with ASC 715, Compensation—Retirement Benefits. The plans utilize assumptions and methods determined in accordance with ASC 715, including reflecting trust assets at their fair value for the qualified pension plans and recognizing the overfunded and underfunded status of the plans on its consolidated balance sheet. Gains and losses, prior service costs and credits are recognized in accumulated other comprehensive income, net of tax, until they are amortized, or immediately upon curtailment.
Stock Based Compensation	'
	Stock Based Compensation
	The Corporation accounts for its stock based compensation awards in accordance with ASC 718, Compensation – Stock Compensation, which requires the measurement and recognition of compensation expense, based on estimated fair values, for all share-based awards, including stock options and restricted stock, made to employees and directors.
	ASC 718 requires companies to estimate the fair value of share-based awards on the date of grant. The value of the portion of the award that is ultimately expected to vest is recognized as expense in the Corporation’s consolidated statement of income over the shorter of requisite service periods or the period through the date that the employee first becomes eligible to retire. Because share-based compensation expense is based on awards that are ultimately expected to vest, share-based compensation expense has been reduced to account for estimated forfeitures. Forfeitures are estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates.
Troubled Debt Restructurings	'
	Troubled Debt Restructurings
	In January 2014, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (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 OREO recognized. This update 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 is not expected to have a material effect on the financial statements, results of operations or liquidity of the Corporation.
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. This update 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.
Comprehensive Income	'
	Comprehensive Income
	In February 2013, the FASB issued ASU No. 2013-02, Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income, that requires an entity to report the effects of significant reclassifications out of each component of accumulated other comprehensive income on the respective line item in net income if the amount being reclassified is required under GAAP to be reclassified to net income in its entirety in the same reporting period. For amounts not required to be reclassified in their entirety in the same reporting period, an entity shall add a cross reference to the related footnote where additional information about the effect of the reclassification is disclosed. The requirements of ASU 2013-02 were effective prospectively for reporting periods beginning after December 15, 2012. The adoption of this update did not have a material effect on the financial statements, results of operations or liquidity of the Corporation.
Disclosures about Offsetting Assets and Liabilities	'
	Disclosures about Offsetting Assets and Liabilities
	In January 2013, the FASB issued ASU No. 2013-01, Scope Clarification of Disclosures about Offsetting Assets and Liabilities, that clarifies the scope of its previously issued guidance, limiting the disclosure requirements to derivative instruments, repurchase agreements and reverse repurchase agreements and securities borrowing and lending transactions to the extent that they are offset in the financial statements or subject to an enforceable master netting arrangement or similar agreement. The requirements of ASU 2013-01 were effective on January 1, 2013. The adoption of this update did not have a material effect on the financial statements, results of operations or liquidity of the Corporation.

Mergers_and_Acquisitions_Table

Mergers and Acquisitions (Tables)	12 Months Ended
	Dec. 31, 2013
Business Combinations [Abstract]	'
Amounts Recorded on Consolidated Balance Sheet in Conjunction with Acquisition	'
	The following table summarizes the amounts recorded on the consolidated balance sheet as of each of the acquisition dates in conjunction with the Parkvale, ANNB and PVF acquisitions:
		Parkvale		Annapolis		PVF
		Financial		Bancorp,		Capital
		Corporation		Inc.		Corp.
	Fair value of consideration paid:
	Common stock issued, net of offering costs	$	136,441	$	54,065	$	109,856
	Warrant assumed		4,459		2,235		—
	Total consideration paid		140,900		56,300		109,856
	Fair value of identifiable assets acquired:
	Cash and cash equivalents		203,538		41,986		99,650
	Securities		486,186		99,309		47,258
	Loans		919,480		256,199		512,566
	Other intangible assets		16,033		3,775		15,288
	Accrued income and other assets		118,648		28,948		63,724
	Total identifiable assets acquired		1,743,885		430,217		738,486
	Fair value of liabilities assumed:
	Deposits		1,525,253		349,370		627,046
	Borrowings		171,606		58,204		37,241
	Accrued expenses and other liabilities		12,728		3,753		15,627
	Total liabilities assumed		1,709,587		411,327		679,914
	Fair value of net identifiable assets acquired		34,298		18,890		58,572
	Goodwill recognized	$	106,602	$	37,410	$	51,284
Summary of Pro Forma Information Estimated	'
	The following pro forma information for the year ended December 31, 2011 reflects the Corporation’s estimated consolidated results of operations as if the Parkvale acquisition occurred on January 1, 2011, unadjusted for potential cost savings:
	Year Ended December 31	2011
	Revenue (net interest income and non-interest income)	$	486,818
	Net income		96,299
	Net income available to common stockholders		94,711
	Earnings per common share – basic		0.69
	Earnings per common share – diluted		0.69

Securities_Tables

Securities (Tables)	12 Months Ended
	Dec. 31, 2013
Text Block [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
			Cost				Unrealized				Unrealized				Value
							Gains				Losses
	Securities Available for Sale:
	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
	December 31, 2012
	U.S. government-sponsored entities		$	352,910			$	1,676			$	(129	)		$	354,457
	Residential mortgage-backed securities:
	Agency mortgage-backed securities			267,575				7,575				—				275,150
	Agency collateralized mortgage obligations			465,574				4,201				(228	)			469,547
	Non-agency collateralized mortgage obligations			2,679				50				—				2,729
	States of the U.S. and political subdivisions			23,592				1,232				—				24,824
	Collateralized debt obligations			34,765				967				(13,276	)			22,456
	Other debt securities			21,790				695				(972	)			21,513
	Total debt securities			1,168,885				16,396				(14,605	)			1,170,676
	Equity securities			1,554				462				(9	)			2,007
			$	1,170,439			$	16,858			$	(14,614	)		$	1,172,683
	December 31, 2011
	U.S. government-sponsored entities		$	231,187			$	642			$	—			$	231,829
	Residential mortgage-backed securities:
	Agency mortgage-backed securities			166,758				4,853				—				171,611
	Agency collateralized mortgage obligations			181,493				2,236				—				183,729
	Non-agency collateralized mortgage obligations			31				—				(1	)			30
	States of the U.S. and political subdivisions			38,509				1,841				—				40,350
	Collateralized debt obligations			19,224				—				(13,226	)			5,998
	Other debt securities			6,863				—				(1,666	)			5,197
	Total debt securities			644,065				9,572				(14,893	)			638,744
	Equity securities			1,593				257				(23	)			1,827
			$	645,658			$	9,829			$	(14,916	)		$	640,571
Schedule of Amortized Cost and Fair Value of Securities Held to Maturity	'
			Amortized				Gross				Gross				Fair
			Cost				Unrealized				Unrealized				Value
							Gains				Losses
	Securities Held to Maturity:
	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
	December 31, 2012
	U.S. Treasury		$	503			$	188			$	—			$	691
	U.S. government-sponsored entities			28,731				280				(99	)			28,912
	Residential mortgage-backed securities:
	Agency mortgage-backed securities			780,022				28,783				(1	)			808,804
	Agency collateralized mortgage obligations			133,976				1,266				—				135,242
	Non-agency collateralized mortgage obligations			14,082				130				—				14,212
	Commercial mortgage-backed securities			1,024				39				—				1,063
	States of the U.S. and political subdivisions			147,713				6,099				—				153,812
	Collateralized debt obligations			512				—				(35	)			477
			$	1,106,563			$	36,785			$	(135	)		$	1,143,213
	December 31, 2011
	U.S. Treasury		$	504			$	185			$	—			$	689
	U.S. government-sponsored entities			4,019				175				—				4,194
	Residential mortgage-backed securities:
	Agency mortgage-backed securities			683,100				28,722				—				711,822
	Agency collateralized mortgage obligations			54,319				573				(11	)			54,881
	Non-agency collateralized mortgage obligations			24,348				143				(1,373	)			23,118
	States of the U.S. and political subdivisions			147,748				6,877				—				154,625
	Collateralized debt obligations			1,592				—				(314	)			1,278
	Other debt securities			1,582				25				(181	)			1,426
			$	917,212			$	36,700			$	(1,879	)		$	952,033
Gross Gains and Gross Losses Realized on Sales of Securities	'
	Gross gains and gross losses were realized on securities as follows:
	Year Ended December 31		2013				2012				2011
	Gross gains		$	1,200			$	1,154			$	3,848
	Gross losses			(392	)			(849	)			(196	)
			$	808			$	305			$	3,652
Amortized Cost and Fair Value of Securities, by Contractual Maturities	'
	As of December 31, 2013, 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		$	—			$	—			$	3,376			$	3,421
	Due from one to five years			281,854				278,833				47,666				46,735
	Due from five to ten years			79,155				77,071				51,161				51,798
	Due after ten years			46,304				39,778				73,784				73,131
				407,313				395,682				175,987				175,085
	Residential mortgage-backed securities:
	Agency mortgage-backed securities			247,880				250,881				628,681				634,930
	Agency collateralized mortgage obligations			511,098				491,199				385,408				370,328
	Non-agency collateralized mortgage obligations			1,747				1,762				6,852				6,892
	Commercial mortgage-backed securities			—				—				2,241				2,328
	Equity securities			1,444				2,126				—				—
			$	1,169,482			$	1,141,650			$	1,199,169			$	1,189,563
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												Greater than 12 Months										Total
			#				Fair				Unrealized				#				Fair			Unrealized			#		Fair		Unrealized
							Value				Losses								Value			Losses					Value		Losses
	Securities Available for Sale:
	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	)
	December 31, 2012
	U.S. government-sponsored entities			3			$	44,868			$	(129	)			—			$	—		$	—			3	$	44,868	$	(129	)
	Residential mortgage-backed securities:
	Agency collateralized mortgage obligations			3				47,174				(228	)			—				—			—			3		47,174		(228	)
	Collateralized debt obligations			7				8,708				(909	)			9				5,532			(12,367	)		16		14,240		(13,276	)
	Other debt securities			—				—				—				4				5,899			(972	)		4		5,899		(972	)
	Equity securities			1				654				(9	)			—				—			—			1		654		(9	)
				14			$	101,404			$	(1,275	)			13			$	11,431		$	(13,339	)		27	$	112,835	$	(14,614	)
			Less than 12 Months												Greater than 12 Months										Total
			#				Fair Value				Unrealized				#				Fair			Unrealized			#		Fair Value		Unrealized
											Losses								Value			Losses							Losses
	Securities Held to Maturity:
	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	)
	December 31, 2012
	U.S. government-sponsored entities			1			$	14,901			$	(99	)			—			$	—		$	—			1	$	14,901	$	(99	)
	Residential mortgage-backed securities:
	Agency mortgage-backed securities			1				1,424				(1	)			—				—			—			1		1,424		(1	)
	Collateralized debt obligations			—				—				—				1				477			(35	)		1		477		(35	)
				2			$	16,325			$	(100	)			1			$	477		$	(35	)		3	$	16,802	$	(135	)
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 Year Ended December 31, 2013
	Beginning balance		$	17,155			$	212			$	—			$	17,367
	Loss where impairment was not previously recognized			—				—				27				27
	Additional loss where impairment was previously recognized			—				—				—				—
	Reduction due to credit impaired securities sold			—				(212	)			—				(212	)
	Ending balance		$	17,155			$	—			$	27			$	17,182
	For the Year Ended December 31, 2012
	Beginning balance		$	18,369			$	29				—			$	18,398
	Loss where impairment was not previously recognized			—				212				—				212
	Additional loss where impairment was previously recognized			—				—				—				—
	Reduction due to credit impaired securities sold			(1,214	)			(29	)			—				(1,243	)
	Ending balance		$	17,155			$	212				—			$	17,367
Trust Preferred Securities	'
	The following table provides information relating to the Corporation’s TPS as of December 31, 2013:
	Security		Class		Current				Amortized				Fair				Unrealized				Lowest	Number of			Actual		Actual		Projected			Expected		Excess
					Par				Cost				Value				Gain				Credit	Issuers			Defaults		Deferrals		Recovery			Defaults		Subordination
					Value												(Loss)				Ratings	Currently			(as a		(as a		Rates on			(%) (2)		(as a percent
																						Performing			percent of		percent of		Current					of current
																									original		original		Deferrals					collateral) (3)
																									collateral)		collateral)		-1
	Pooled TPS:
	P1		C1		$	5,500			$	2,611			$	1,567			$	(1,044	)		C		42			22		7		41			17		0
	P2		C1			4,889				3,133				1,326				(1,807	)		C		40			16		15		45			14		0
	P3		C1			5,561				4,416				1,691				(2,725	)		C		46			13		9		34			16		0
	P4		C1			3,994				3,169				1,196				(1,973	)		C		51			16		6		46			16		0
	P5		B3			2,000				780				373				(407	)		C		14			29		10		48			11		0
	P6		B1			3,028				2,539				1,016				(1,523	)		C		50			15		18		50			10		0
	P7		C			5,048				864				1,453				589			C		38			14		19		38			13		0
	P8		C			2,011				788				341				(447	)		C		44			16		11		36			17		0.32
	P9		A4L			2,000				645				456				(189	)		C		25			16		10		37			11		0
	Total OTTI					34,031				18,945				9,419				(9,526	)				350			17		11		42			15
	P10		C1			5,219				1,109				1,487				378			C		42			22		7		41			17		0
	P11		A2A			5,000				2,240				2,384				144			B+		40			16		15		45			14		51.83
	P12		C1			4,781				1,371				1,454				83			C		46			13		9		34			16		0
	P13		C1			5,260				1,336				1,574				238			C		51			16		6		46			16		0
	P14		C1			5,190				1,108				1,357				249			C		57			15		12		28			17		0
	P15		C1			3,206				429				616				187			C		41			21		6		23			17		0
	P16		C			3,339				678				775				97			C		37			17		9		31			14		0
	P17		B			2,069				694				763				69			Ca		33			14		17		40			14		21.87
	P18		B2			5,000				2,243				3,096				853			CCC		19			0		8		90			14		38.1
	P19		B			4,080				976				1,498				522			C		44			16		11		36			17		15
	P20		A1			3,279				1,977				2,107				103			BB-		46			21		6		42			15		55.16
	P21		B			5,000				1,327				1,331				4			C		16			18		5		49			11		0
	P22		C1			5,531				1,440				1,954				514			C		25			15		7		40			10		0
	P23		C1			5,606				1,330				1,780				450			C		24			16		8		42			10		0
	Total Not OTTI					62,560				18,258				22,176				3,918					521			16		9		41			15
	Total Pooled TPS				$	96,591			$	37,203			$	31,595			$	(5,608	)				871			16		10		41			15
	Single Issuer TPS:
	S1				$	2,000			$	1,955			$	1,580			$	(375	)		BB		1
	S2					2,000				1,925				1,630				(295	)		BBB		1
	S3					2,000				2,000				1,950				(50	)		B+		1
	S4					1,000				999				790				(209	)		BB		1
	Total Single Issuer TPS				$	7,000			$	6,879			$	5,950			$	(929	)				4
	Total TPS				$	103,591			$	44,082			$	37,545			$	(6,537	)				875
	-1	Some current deferrals are expected to cure at rates varying from 10% to 90% after five years.
	-2	Expected future defaults as a percent of remaining performing collateral.
	-3	Excess subordination represents the additional defaults in excess of both current and projected defaults that the CDO can absorb before the bond experiences any credit impairment.

Loans_and_Allowance_for_Loan_L1

Loans and Allowance for Loan Losses (Tables)	12 Months Ended
	Dec. 31, 2013
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
	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
	December 31, 2012
	Commercial real estate		$	2,448,471		$	258,575		$	2,707,046
	Commercial and industrial			1,555,301			47,013			1,602,314
	Commercial leases			130,133			—			130,133
	Total commercial loans and leases			4,133,905			305,588			4,439,493
	Direct installment			1,108,865			69,665			1,178,530
	Residential mortgages			653,826			438,402			1,092,228
	Indirect installment			568,324			13,713			582,037
	Consumer lines of credit			732,534			72,960			805,494
	Other			39,937			—			39,937
			$	7,237,391		$	900,328		$	8,137,719
Summary of Loans To Related Parties	'
	Following is an analysis of these loans to related parties:
	Total loans at December 31, 2012		$	74,096
	New loans			3,210
	Repayments			(7,749	)
	Other			(25,334	)
	Total loans at December 31, 2013		$	44,223
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 ASC310-30 (impaired and non-impaired) acquired from PVF and ANNB in 2013 and Parkvale in 2012:
			Acquired			Acquired			Total
			Impaired			Performing
			Loans			Loans
	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
	Acquired from Parkvale in 2012
	Contractually required cash flows at acquisition		$	12,224		$	1,327,342		$	1,339,566
	Non-accretable difference (expected losses and foregone interest)			(6,070	)		(214,541	)		(220,611	)
	Cash flows expected to be collected at acquisition			6,154			1,112,801			1,118,955
	Accretable yield			(589	)		(293,594	)		(294,183	)
	Basis in acquired loans at acquisition		$	5,565		$	819,207		$	824,772
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
	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
	Year Ended December 31, 2012
	Balance at beginning of period		$	2,477		$	49,229		$	51,706
	Acquisitions			589			293,594			294,183
	Reduction due to unexpected early payoffs			—			(57,840	)		(57,840	)
	Reclass from non-accretable difference			3,539			10,915			14,454
	Disposals/transfers			(49	)		(615	)		(664	)
	Accretion			(5,778	)		(41,908	)		(47,686	)
	Balance at end of period		$	778		$	253,375		$	254,153
Summary of Purchased Credit-Impaired Loans, Information Identified in Corporation's Acquisition of ANNB and Parkvale	'
	Following is information about PCI loans identified in the Corporation’s acquisition of PVF:
			At			December 31,
			Acquisition			2013
	Outstanding balance		$	29,811		$	29,642
	Carrying amount			11,412			11,063
	Allowance for loan losses			n/a			—
	Impairment recognized since acquisition			n/a			—
	Allowance reduction recognized since acquisition			n/a			—
	Following is information about PCI loans identified in the Corporation’s acquisition of ANNB:
			At			December 31,
			Acquisition			2013
	Outstanding balance		$	12,220		$	5,580
	Carrying amount			3,848			2,308
	Allowance for loan losses			n/a			—
	Impairment recognized since acquisition			n/a			31
	Allowance reduction recognized since acquisition			n/a			—
Summary of Information about Corporation's Purchased Credit-Impaired Loans	'
	Following is information about the Corporation’s PCI loans:
			Outstanding			Non-Accretable			Expected			Accretable			Recorded
			Balance			Difference			Cash Flows			Yield			Investment
	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
	For the Year Ended December 31, 2012
	Balance at beginning of period		$	51,693		$	(33,377	)	$	18,316		$	(2,477	)	$	15,839
	Acquisitions			9,135			(2,981	)		6,154			(589	)		5,565
	Accretion			—			—			—			5,778			5,778
	Payments received			(9,556	)		—			(9,556	)		—			(9,556	)
	Reclass from non-accretable difference			—			3,539			3,539			(3,539	)		—
	Disposals/transfers			(12,494	)		11,442			(1,052	)		49			(1,003	)
	Contractual interest			2,356			(2,356	)		—			—			—
	Balance at end of period		$	41,134		$	(23,733	)	$	17,401		$	(778	)	$	16,623
Summary of Non-Performing Assets	'
	Following is a summary of non-performing assets:
	December 31		2013			2012
	Non-accrual loans		$	58,755		$	66,004
	Troubled debt restructurings			18,698			14,876
	Total non-performing loans			77,453			80,880
	Other real estate owned (OREO)			40,681			35,257
	Total non-performing loans and OREO			118,134			116,137
	Non-performing investments			797			2,809
	Total non-performing assets		$	118,931		$	118,946
	Asset quality ratios:
	Non-performing loans as a percent of total loans			0.81	%		0.99	%
	Non-performing loans + OREO as a percent of total loans + OREO			1.24	%		1.42	%
	Non-performing assets as a percent of total assets			0.88	%		0.99	%
Age Analysis of Past Due Loans, by Class	'
	The following tables provide an analysis of the aging of loans by class segregated by loans originated and loans acquired:
			30-89 Days			³ 90 Days			Non-Accrual			Total			Current			Total
			Past Due			Past Due and						Past Due						Loans
						Still Accruing
	Originated loans:
	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
	December 31, 2012
	Commercial real estate		$	5,786		$	533		$	47,895		$	54,214		$	2,394,257		$	2,448,471
	Commercial and industrial			7,310			456			6,017			13,783			1,541,518			1,555,301
	Commercial leases			1,671			—			965			2,636			127,497			130,133
	Total commercial loans and leases			14,767			989			54,877			70,633			4,063,272			4,133,905
	Direct installment			8,834			2,717			3,342			14,893			1,093,972			1,108,865
	Residential mortgages			15,821			2,365			2,891			21,077			632,749			653,826
	Indirect installment			5,114			374			1,039			6,527			561,797			568,324
	Consumer lines of credit			1,633			247			355			2,235			730,299			732,534
	Other			36			15			3,500			3,551			36,386			39,937
			$	46,205		$	6,707		$	66,004		$	118,916		$	7,118,475		$	7,237,391
			30-89			³ 90 Days			Non-Accrual			Total			Current			Discount			Total
			Days			Past Due						Past									Loans
			Past Due			and Still						Due (1)(2)
						Accruing
	Acquired Loans:
	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
	December 31, 2012
	Commercial real estate		$	6,829		$	13,597			—		$	20,426		$	250,116		$	(11,967	)	$	258,575
	Commercial and industrial			1,653			138			—			1,791			47,351			(2,129	)		47,013
	Commercial leases			—			—			—			—			—			—			—
	Total commercial loans and leases			8,482			13,735			—			22,217			297,467			(14,096	)		305,588
	Direct installment			1,454			947			—			2,401			63,502			3,762			69,665
	Residential mortgages			12,137			21,069			—			33,206			439,620			(34,424	)		438,402
	Indirect installment			347			56			—			403			14,089			(779	)		13,713
	Consumer lines of credit			379			778			—			1,157			75,800			(3,997	)		72,960
	Other			—			—			—			—			—			—			—
			$	22,799		$	36,585			—		$	59,384		$	890,478		$	(49,534	)	$	900,328
	-1	Past due information for loans acquired is based on the contractual balance outstanding at December 31, 2013 and December 31, 2012.
	-2	Acquired loans are considered performing upon acquisition, regardless of whether the customer is contractually delinquent, if the Corporation can reasonably estimate the timing and amount of expected cash flows on such loans. Accordingly, the Corporation does not consider acquired contractually delinquent loans to be non-accrual or non-performing and continues to recognize interest income on these loans using the accretion method.
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 as of December 31, 2013.
			Commercial Loan Credit Quality Categories
			Pass			Special			Substandard			Doubtful			Total
						Mention
	Originated Loans:
	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
	December 31, 2012
	Commercial real estate		$	2,282,139		$	57,938		$	106,258		$	2,136		$	2,448,471
	Commercial and industrial			1,472,598			32,227			49,814			662			1,555,301
	Commercial leases			126,283			243			3,607			—			130,133
			$	3,881,020		$	90,408		$	159,679		$	2,798		$	4,133,905
	Acquired Loans:
	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
	December 31, 2012
	Commercial real estate		$	204,300		$	14,713		$	39,093		$	469		$	258,575
	Commercial and industrial			39,596			3,611			3,804			2			47,013
	Commercial leases			—			—			—			—			—
			$	243,896		$	18,324		$	42,897		$	471		$	305,588
Summary of Consumer Loans by Payment Status	'
	Following is a table showing originated consumer and other loans by payment status:
			Consumer Loan Credit Quality by Payment Status
			Performing			Non-Performing			Total
	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
	December 31, 2012
	Direct installment		$	1,100,324		$	8,541		$	1,108,865
	Residential mortgages			642,406			11,420			653,826
	Indirect installment			567,192			1,132			568,324
	Consumer lines of credit			731,788			746			732,534
	Other			36,437			3,500			39,937
Summary of Impaired Loans, by Class	'
	Following is a summary of information pertaining to originated loans considered to be impaired, by class of loans:
	At or For the Year Ended		Recorded			Unpaid			Related			Average
	December 31, 2013		Investment			Principal			Allowance			Recorded
						Balance						Investment
	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			—			—			—			—
	At or For the Year Ended		Recorded			Unpaid			Related			Average
	December 31, 2012		Investment			Principal			Allowance			Recorded
						Balance						Investment
	With no specific allowance recorded:
	Commercial real estate		$	37,119		$	50,234		$	—		$	36,426
	Commercial and industrial			7,074			9,597			—			6,992
	Commercial leases			965			—			—			1,053
	Total commercial loans and leases			45,158			59,831			—			44,471
	Direct installment			8,541			8,693			—			6,443
	Residential mortgages			11,414			11,223			—			9,059
	Indirect installment			1,132			2,381			—			1,133
	Consumer lines of credit			746			792			—			591
	Other			3,500			3,500			—			3,500
	With a specific allowance recorded:
	Commercial real estate			12,623			21,877			2,136			14,522
	Commercial and industrial			590			590			590			592
	Commercial leases			—			—			—			—
	Total commercial loans and leases			13,213			22,467			2,726			15,114
	Direct installment			—			—			—			—
	Residential mortgages			—			—			—			—
	Indirect installment			—			—			—			—
	Consumer lines of credit			—			—			—			—
	Other			—			—			—			—
	Total:
	Commercial real estate			49,742			72,111			2,136			50,948
	Commercial and industrial			7,664			10,187			590			7,584
	Commercial leases			965			—			—			1,053
	Total commercial loans and leases			58,371			82,298			2,726			59,585
	Direct installment			8,541			8,693			—			6,443
Residential mortgages			11,414			11,223			—			9,059
Indirect installment			1,132			2,381			—			1,133
Consumer lines of credit			746			792			—			591
Other			3,500			3,500			—			3,500
Summary of Composition of Total TDRs	'
	Following is a summary of the composition of total TDRs:
	December 31		2013			2012
	Accruing:
	Performing		$	10,220		$	12,659
	Non-performing			18,698			14,876
	Non-accrual			12,705			12,385
			$	41,623		$	39,920
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:
	Year Ended December 31		2013									2012
			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			10		$	4,439		$	3,588			21		$	4,067		$	4,505
	Commercial and industrial			—			—			—			8			389			257
	Commercial leases			—			—			—			—			—			—
	Total commercial loans and leases			10			4,439			3,588			29			4,456			4,762
	Direct installment			409			4,198			3,971			362			3,876			3,763
	Residential mortgages			54			2,464			2,366			56			2,232			2,814
	Indirect installment			28			117			107			31			169			151
	Consumer lines of credit			19			148			143			20			214			315
	Other			—			—			—			—			—			—
				520		$	11,366		$	10,175			498		$	10,947		$	11,805
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.
	Year Ended December 31		2013						2012
			Number			Recorded			Number			Recorded
			of			Investment  (1)			of			Investment  (1)
			Contracts						Contracts
	Commercial real estate			1		$	737			—		$	—
	Commercial and industrial			1			12			—			—
	Commercial leases			—			—			—			—
	Total commercial loans and leases			2			749			—			—
	Direct installment			76			380			38			249
	Residential mortgages			7			303			5			229
	Indirect installment			6			36			3			5
	Consumer lines of credit			1			85			—			—
	Other			—			—			—			—
				92		$	1,553			46		$	483
	-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 Year									Offs			Losses			Year
	Year Ended December 31, 2013
	Commercial real estate		$	34,810		$	(5,465	)	$	1,799		$	(3,666	)	$	1,404		$	32,548
	Commercial and industrial			31,849			(5,124	)		2,108			(3,016	)		3,770			32,603
	Commercial leases			1,744			(432	)		179			(253	)		412			1,903
	Total commercial loans and leases			68,403			(11,021	)		4,086			(6,935	)		5,586			67,054
	Direct installment			15,130			(9,059	)		931			(8,128	)		10,822			17,824
	Residential mortgages			5,155			(1,345	)		162			(1,183	)		1,864			5,836
	Indirect installment			5,449			(3,337	)		773			(2,564	)		3,524			6,409
	Consumer lines of credit			6,057			(1,974	)		274			(1,700	)		2,874			7,231
	Other			—			(965	)		—			(965	)		1,495			530
	Total allowance on originated loans			100,194			(27,701	)		6,226			(21,475	)		26,165			104,884
	Purchased credit-impaired loans			759			(299	)		—			(299	)		540			1,000
	Other acquired loans			3,421			(2,530	)		(376	)		(2,906	)		4,385			4,900
	Total allowance on acquired loans			4,180			(2,829	)		(376	)		(3,205	)		4,925			5,900
	Total allowance		$	104,374		$	(30,530	)	$	5,850		$	(24,680	)	$	31,090		$	110,784
	Year Ended December 31, 2012
	Commercial real estate		$	43,283		$	(8,688	)	$	1,765		$	(6,923	)	$	(1,550	)	$	34,810
	Commercial and industrial			25,476			(8,098	)		693			(7,405	)		13,778			31,849
	Commercial leases			1,556			(509	)		224			(285	)		473			1,744
	Total commercial loans and leases			70,315			(17,295	)		2,682			(14,613	)		12,701			68,403
	Direct installment			14,814			(7,875	)		942			(6,933	)		7,249			15,130
	Residential mortgages			4,437			(1,050	)		194			(856	)		1,574			5,155
	Indirect installment			5,503			(2,926	)		605			(2,321	)		2,267			5,449
	Consumer lines of credit			5,447			(2,137	)		234			(1,903	)		2,513			6,057
	Other			146			(1,039	)		14			(1,025	)		879			—
	Total allowance on originated loans			100,662			(32,322	)		4,671			(27,651	)		27,183			100,194
	Purchased credit-impaired loans			—			—			—			—			759			759
	Other acquired loans			—			(254	)		315			61			3,360			3,421
	Total allowance on acquired loans			—			(254	)		315			61			4,119			4,180
	Total allowance		$	100,662		$	(32,576	)	$	4,986		$	(27,590	)	$	31,302		$	104,374
	Year Ended December 31, 2011
	Commercial real estate		$	49,924		$	(21,018	)	$	594		$	(20,424	)	$	13,783		$	43,283
	Commercial and industrial			24,682			(3,642	)		368			(3,274	)		4,068			25,476
	Commercial leases			1,070			(567	)		75			(492	)		978			1,556
	Total commercial loans and leases			75,676			(25,227	)		1,037			(24,190	)		18,829			70,315
	Direct installment			14,941			(8,874	)		876			(7,998	)		7,871			14,814
	Residential mortgages			4,578			(1,261	)		67			(1,194	)		1,053			4,437
	Indirect installment			5,941			(2,957	)		501			(2,456	)		2,018			5,503
	Consumer lines of credit			4,743			(2,110	)		213			(1,897	)		2,601			5,447
	Other			241			(1,194	)		31			(1,163	)		1,068			146
	Total allowance on originated loans			106,120			(41,623	)		2,725			(38,898	)		33,440			100,662
	Purchased credit-impaired loans			—			(208	)		7			(201	)		201			—
	Other acquired loans			—			—			—			—			—			—
	Total allowance on acquired loans			—			(208	)		7			(201	)		201			—
	Total allowance		$	106,120		$	(41,831	)	$	2,732		$	(39,099	)	$	33,641		$	100,662
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 originated loan balances by class:
			Allowance						Loans Outstanding
			Individually			Collectively			Originated			Individually			Collectively
			Evaluated			Evaluated			Loans			Evaluated			Evaluated
			for			for						for			for
			Impairment			Impairment						Impairment			Impairment
	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
	December 31, 2012
	Commercial real estate		$	2,136		$	32,674		$	2,448,471		$	35,024		$	2,413,447
	Commercial and industrial			590			31,259			1,555,301			1,624			1,553,677
	Commercial leases			—			1,744			130,133			—			130,133
	Total commercial loans and leases			2,726			65,677			4,133,905			36,648			4,097,257
	Direct installment			—			15,130			1,108,865			—			1,108,865
	Residential mortgages			—			5,155			653,826			—			653,826
	Indirect installment			—			5,449			568,324			—			568,324
	Consumer lines of credit			—			6,057			732,534			—			732,534
	Other			—			—			39,937			—			39,937
			$	2,726		$	97,468		$	7,237,391		$	36,648		$	7,200,743

Premises_and_Equipment_Tables

Premises and Equipment (Tables)	12 Months Ended
	Dec. 31, 2013
Property Plant And Equipment [Abstract]	'
Summary Of Premises And Equipment	'
	Following is a summary of premises and equipment:
	December 31	2013			2012
	Land	$	34,234		$	31,196
	Premises		135,633			128,259
	Equipment		117,228			101,144
			287,095			260,599
	Accumulated depreciation		(133,063	)		(120,232	)
		$	154,032		$	140,367
Summary Of Future Minimum Lease Payments	'
	Following is a summary of future minimum lease payments for years following December 31, 2013:
	2014	$	9,994
	2015		8,769
	2016		7,743
	2017		7,131
	2018		5,545
	Later years		26,873

Goodwill_and_Other_Intangible_1

Goodwill and Other Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2013
Goodwill And Intangible Assets Disclosure [Abstract]	'
Rollforward of Goodwill	'
	The following table shows a rollforward of goodwill by line of business:
		Community			Wealth			Insurance			Consumer			Total
		Banking			Manage-						Finance
					ment
	Balance at January 1, 2012	$	549,683		$	8,020		$	8,950		$	1,809		$	568,462
	Goodwill additions		107,093			—			—			—			107,093
	Balance at December 31, 2012		656,776			8,020			8,950			1,809			675,555
	Goodwill additions		88,693			—			—			—			88,693
	Balance at December 31, 2013	$	745,469		$	8,020		$	8,950		$	1,809		$	764,248
Summary of Core Deposit Intangibles, Customer and Renewal Lists and Other Intangible Assets	'
	The following table shows a summary of core deposit intangibles, customer and renewal lists and other intangible assets:
		Core			Customer			Other			Total
		Deposit			and Renewal			Intangible			Finite-lived
		Intangibles			Lists			Assets			Intangibles
	December 31, 2013
	Gross carrying amount	$	97,698		$	10,970		$	10,380		$	119,048
	Accumulated amortization		(62,793	)		(6,407	)		(2,240	)		(71,440	)
		$	34,905		$	4,563		$	8,140		$	47,608
	December 31, 2012
	Gross carrying amount	$	87,056		$	10,970		$	1,859		$	99,885
	Accumulated amortization		(55,095	)		(5,698	)		(1,241	)		(62,034	)
		$	31,961		$	5,272		$	618		$	37,851
Schedule of Expected Amortization Expenses on Finite-Lived Intangible Assets	'
	Following is a summary of the expected amortization expense on finite-lived intangible assets, assuming no new additions, for each of the five years following December 31, 2013:
	2014	$	8,615
	2015		6,590
	2016		5,580
	2017		4,855
	2018		3,379

Deposits_Tables

Deposits (Tables)	12 Months Ended
	Dec. 31, 2013
Banking And Thrift [Abstract]	'
Summary of Deposits	'
	Following is a summary of deposits:
	December 31	2013		2012
	Non-interest bearing demand	$	2,200,081	$	1,738,195
	Savings and NOW		5,392,078		4,808,121
	Certificates and other time deposits		2,606,073		2,535,858
		$	10,198,232	$	9,082,174
Time Deposits by Remaining Maturity	'
	Following is a summary of these time deposits by remaining maturity at December 31, 2013:
		Certificates		Other Time		Total
		of Deposit		Deposits
	Three months or less	$	117,298	$	10,297	$	127,595
	Three to six months		121,512		8,659		130,171
	Six to twelve months		190,656		25,468		216,124
	Over twelve months		258,989		124,591		383,580
		$	688,455	$	169,015	$	857,470
Summary of Scheduled Maturities of Certificates and Other Time Deposits	'
	Following is a summary of the scheduled maturities of certificates and other time deposits for the years following December 31, 2013:
	2014	$	1,499,828
	2015		485,809
	2016		279,663
	2017		211,214
	2018		93,915
	Later years		35,644

ShortTerm_Borrowings_Tables

Short-Term Borrowings (Tables)	12 Months Ended
	Dec. 31, 2013
Debt Disclosure [Abstract]	'
Summary of Short-Term Borrowings	'
	Following is a summary of short-term borrowings:
	December 31	2013		2012
	Securities sold under repurchase agreements	$	841,741	$	807,820
	Federal funds purchased		270,000		140,000
	Subordinated notes		129,498		135,318
		$	1,241,239	$	1,083,138

LongTerm_Debt_Tables

Long-Term Debt (Tables)	12 Months Ended
	Dec. 31, 2013
Debt Disclosure [Abstract]	'
Long-Term Debt	'
	Following is a summary of long-term debt:
	December 31	2013		2012
	Federal Home Loan Bank advances	$	50,076	$	88
	Subordinated notes		84,637		79,897
	Other subordinated debt		8,637		8,850
	Convertible subordinated notes		578		590
		$	143,928	$	89,425
Scheduled Annual Maturities of Long-Term Debt	'
	Scheduled annual maturities for all of the long-term debt for the years following December 31, 2013 are as follows:
	2014	$	28,546
	2015		23,023
	2016		75,409
	2017		10,445
	2018		3,077
	Later years		3,428

Junior_Subordinated_Debt_Table

Junior Subordinated Debt (Tables)	12 Months Ended
	Dec. 31, 2013
Text Block [Abstract]	'
Junior Subordinated Debt Trusts	'
	The following table provides information relating to the Trusts as of December 31, 2013:
		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		1.89	%	Variable; LIBOR + 165 basis points (bps)
	Omega Financial Capital Trust I		36,000		1,114		36,029		10/18/34		2.44	%	Variable; LIBOR + 219 bps
	Sun Bancorp Statutory Trust I		16,500		511		17,011		2/22/31		10.2	%	Fixed
		$	74,000	$	2,290	$	75,205

Derivative_Instruments_Tables

Derivative Instruments (Tables)	12 Months Ended
	Dec. 31, 2013
Derivative Instruments And Hedging Activities Disclosure [Abstract]	'
Offsetting of Derivative Liabilities	'
	Offsetting of Derivative Liabilities:
	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
	December 31, 2012
	Derivative liabilities subject to master netting arrangement:
	Interest rate contracts		$	58,134			—			$	58,134
	Derivative liabilities not subject to master netting arrangement:
	Equity contracts			16			—				16
	Total derivative liabilities		$	58,150			—			$	58,150
Offsetting of Derivative Assets	'
		Gross			Gross				Net Amount
		Amount			Amounts				Presented in
					Offset in				the Balance
					the Balance				Sheet
					Sheet
	Offsetting of Derivative Assets:
	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
	December 31, 2012
	Derivative assets subject to master netting arrangement:
	Equity contracts		$	16			—			$	16
	Derivative assets not subject to master netting arrangement:
	Interest rate contracts			57,992			—				57,992
	Total derivative assets		$	58,008			—			$	58,008
Derivative Liabilities	'
	Derivative Liabilities:
	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
	December 31, 2012
	Counterparty A		$	8,393		$	8,393				—	$	—
	Counterparty B			5,601			5,601				—		—
	Counterparty C			2,145			2,145				—		—
	Counterparty D			12,354			12,354				—		—
	Counterparty E			8,846			8,846				—		—
	Counterparty F			353			282				—		71
	Counterparty G			5,497			5,497				—		—
	Counterparty H			3,937			1,775				—		2,162
	Counterparty I			11,008			11,008				—		—
			$	58,134		$	55,901				—	$	2,233
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:
	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
	December 31, 2012
	Counterparty E		$	16			—				—	$	16
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			Year Ended December 31,
			Statement
			Location			2013				2012		2011
	Interest Rate Products			Other income		$	(39	)		$	167	$	(635	)

Commitments_Credit_Risk_and_Co1

Commitments, Credit Risk and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2013
Commitments And Contingencies Disclosure [Abstract]	'
Summary of Off-Balance Sheet Credit Risk Information	'
	Following is a summary of off-balance sheet credit risk information:
	December 31	2013		2012
	Commitments to extend credit	$	2,897,748	$	2,600,355
	Standby letters of credit		114,298		130,912

Stock_Incentive_Plans_Tables

Stock Incentive Plans (Tables)	12 Months Ended
	Dec. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'
Summary of Information Concerning Restricted Stock Awards	'
	The following table summarizes certain information concerning restricted stock awards:
		2013			Weighted		2012			Weighted		2011			Weighted
					Average					Average					Average
					Grant					Grant					Grant
					Price per					Price per					Price per
					Share					Share					Share
	Unvested shares outstanding at beginning of year		1,913,073		$	9.17		1,846,115		$	8.44		1,309,489		$	8.52
	Granted		361,664			11.1		321,295			12.09		407,980			10.07
	Net adjustment due to performance		165,545			9.6		28,181			8.31		229,516			8.4
	Vested		(734,129	)		7.9		(179,767	)		8.24		(172,029	)		13.57
	Forfeited		(37,828	)		10.42		(179,132	)		8.5		(1,749	)		10.09
	Dividend reinvestment		60,708			11.82		76,381			11.19		72,908			10.01
	Unvested shares outstanding at end of year		1,729,033			10.23		1,913,073			9.17		1,846,115			8.44
Components of Restricted Stock Awards	'
	The components of the restricted stock awards as of December 31, 2013 are as follows:
		Service-			Performance-		Total
		Based			Based
		Awards			Awards
	Unvested shares		446,239			1,282,794		1,729,033
	Unrecognized compensation expense	$	1,671		$	3,220	$	4,891
	Intrinsic value	$	5,632		$	16,189	$	21,821
	Weighted average remaining life (in years)		2.16			2.22		2.2
Summary of Information Concerning Stock Option Awards	'
	The following table summarizes certain information concerning stock options:
		2013			Weighted		2012			Weighted		2011			Weighted
					Average					Average					Average
					Price per					Price per					Price per
					Share					Share					Share
	Options outstanding at beginning of year		640,050		$	13.21		586,020		$	14.93		770,610		$	14.28
	Assumed from acquisition		274,964			11.16		627,808			10.41		—			—
	Exercised		(69,429	)		7.46		(182,188	)		8.87		(8,389	)		2.68
	Forfeited		(312,061	)		15.58		(391,590	)		13.32		(176,201	)		12.67
	Options outstanding and exercisable at end of year		533,524			11.51		640,050			13.21		586,020			14.93
Summary of Stock Options Outstanding	'
	The following table summarizes information about stock options outstanding at December 31, 2013:
	Range of Exercise	Options			Weighted Average		Weighted Average
	Prices	Outstanding			Remaining		Exercise Price
		and Exercisable			Contractual Years
	$3.45 - $5.18		57,517			5.33	$	4.32
	$5.19 - $7.78		159,503			5.21		6.14
	$7.79 - $11.68		—			—		—
	$11.69 - $17.54		259,927			3.11		12.67
	$17.55 - $26.32		16,375			0		18.51
	$26.33 - $36.42		40,202			0.79		32.81
			533,524
Summary of Stock Options Exercised	'
	The following table summarizes certain information relating to stock options exercised:
	Year Ended December 31	2013			2012		2011
	Proceeds from stock options exercised	$	365		$	864	$	22
	Tax benefit recognized from stock options exercised		79			96		22
	Intrinsic value of stock options exercised		318			435		63

Retirement_Plans_Tables

Retirement Plans (Tables)	12 Months Ended
	Dec. 31, 2013
Compensation And Retirement Disclosure [Abstract]	'
Schedule of Accumulated Benefit Obligation, Change in Benefit Obligation, Change in Plan Assets, Plans' Funded Status and Amount Included in Consolidated Balance Sheet	'
	The following tables provide information relating to the accumulated benefit obligation, change in benefit obligation, change in plan assets, the plans’ funded status and the amount included in the consolidated balance sheet for the qualified and non-qualified plans described above (collectively, the Plans):
	December 31	2013				2012
	Accumulated benefit obligation	$	139,483			$	153,606
	Projected benefit obligation at beginning of year	$	153,958			$	143,307
	Service cost		65				59
	Interest cost		5,728				6,173
	Actuarial (gain) loss		(13,486	)			11,558
	Benefits paid		(6,534	)			(7,139	)
	Projected benefit obligation at end of year	$	139,731			$	153,958
	Fair value of plan assets at beginning of year	$	113,416			$	105,330
	Actual return on plan assets		16,534				8,899
	Corporation contribution		16,321				6,326
	Benefits paid		(6,534	)			(7,139	)
	Fair value of plan assets at end of year	$	139,737			$	113,416
	Funded status of plans	$	6			$	(40,542	)
Schedule of Actuarial Assumptions Used in Determination of Projected Benefit Obligation	'
	Actuarial assumptions used in the determination of the projected benefit obligation in the Plans are as follows:
	Assumptions at December 31	2013				2012
	Weighted average discount rate		4.68	%			3.78	%
	Rates of average increase in compensation levels		4	%			4	%
Schedule of Net Periodic Pension Cost and Other Comprehensive Income	'
	The net periodic pension cost and other comprehensive income for the Plans included the following components:
	Year Ended December 31	2013				2012			2011
	Service cost	$	65			$	59		$	58
	Interest cost		5,728				6,173			6,746
	Expected return on plan assets		(9,081	)			(7,935	)		(7,647	)
	Transition amount amortization		(93	)			(93	)		(93	)
	Prior service credit amortization		7				7			7
	Actuarial loss amortization		2,263				1,861			1,131
	Net periodic pension cost (gain)		(1,111	)			72			202
	Other changes in plan assets and benefit obligations recognized in other comprehensive income:
	Current year actuarial (gain) loss		(20,938	)			10,594			19,097
	Amortization of actuarial loss		(2,263	)			(1,861	)		(1,131	)
	Amortization of prior service credit		(7	)			(7	)		(7	)
	Amortization of transition asset		93				93			93
	Total recognized in other comprehensive income		(23,115	)			8,819			18,052
	Total recognized in net periodic pension cost (gain) and other comprehensive income	$	(24,226	)		$	8,891		$	18,254
Schedule of Actuarial Assumptions Used in Determination of Net Periodic Pension Cost	'
	The plans have an actuarial measurement date of December 31. Actuarial assumptions used in the determination of the net periodic pension cost in the Plans are as follows:
	Assumptions for the Year Ended December 31	2013				2012			2011
	Weighted average discount rate		3.78	%			4.39	%		5.28	%
	Rates of increase in compensation levels		4	%			4	%		4	%
	Expected long-term rate of return on assets		7.25	%			7.5	%		7.5	%
Schedule of Projected Benefit Obligation, Accumulated Benefit Obligation and Fair Value of Plan Assets for Qualified and Non-Qualified Pension Plans	'
	As of December 31, 2013 and 2012, the projected benefit obligation, accumulated benefit obligation and fair value of plan assets for the qualified and non-qualified pension plans were as follows:
		Qualified Pension Plans							Non-Qualified
									Pension Plans
	December 31	2013				2012			2013			2012
	Projected benefit obligation	$	120,512			$	133,116		$	19,219		$	20,842
	Accumulated benefit obligation		120,512				133,116			18,971			20,490
	Fair value of plan assets		139,737				113,416			—			—
Schedule of Impact of Changes in Discount Rate, Return on Plan Assets and Compensation Levels on Pension Expense	'
	The impact of changes in the discount rate, expected long-term rate of return on plan assets and compensation levels would have had the following effects on 2013 pension expense:
		Estimated
		Increase in
		Pension
		Expense
	0.5% decrease in the discount rate	$	(35	)
	0.5% decrease in the expected long-term rate of return on plan assets		626
Schedule of Estimated Future Cash Flows	'
	The following table provides information regarding estimated future cash flows relating to the Plans at December 31, 2013:
	Expected employer contributions:	2014		$	1,322
	Expected benefit payments:	2014			6,510
		2015			6,862
		2016			7,246
		2017			9,127
		2018			8,113
		2019 – 2023			44,995
Schedule of Asset Allocations for Pension Plans	'
	The following table presents asset allocations for the Corporation’s pension plans as of December 31, 2013 and 2012, and the target allocation for 2014, by asset category:
		Target				Percentage of Plan Assets
		Allocation
	December 31	2014				2013			2012
	Asset Category
	Equity securities		45 - 65	%			57	%		57	%
	Debt securities		30 - 50				40			40
	Cash equivalents		0 - 10				3			3
Schedule of Fair Values of Pension Plan Assets by Asset Category	'
	The fair values of the Corporation’s pension plan assets by asset category are as follows:
		Level 1				Level 2			Level 3			Total
	December 31, 2013
	Asset Class
	Cash	$	4,090			$	—			—		$	4,090
	Equity securities:
	F.N.B. Corporation		6,943				—			—			6,943
	Other large-cap U.S. financial services companies		2,354				—			—			2,354
	Other large-cap U.S. companies		34,345				—			—			34,345
	International companies		555				—			—			555
	Mutual fund equity investments:
	U.S. equity index funds:
	U.S. large-cap equity index funds		2,543				—			—			2,543
	U.S. small-cap equity index funds		2,850				—			—			2,850
	U.S. mid-cap equity index funds		3,911				—			—			3,911
	Non-U.S. equities growth fund		10,783				—			—			10,783
	U.S. equity funds:
	U.S. mid-cap		7,919				—			—			7,919
	U.S. small-cap		3,653				—			—			3,653
	Other		4,469				—			—			4,469
	Fixed income securities:
	U.S. government agencies		—				44,653			—			44,653
	Fixed income mutual funds:
	U.S. investment-grade fixed income securities		10,196				—			—			10,196
	Non-U.S. fixed income securities		473				—			—			473
		$	95,084			$	44,653			—		$	139,737
	December 31, 2012
	Asset Class
	Cash	$	3,587			$	—			—		$	3,587
	Equity securities:
	F.N.B. Corporation		5,842				—			—			5,842
	Other large-cap U.S. financial services companies		1,563				—			—			1,563
	Other large-cap U.S. companies		27,709				—			—			27,709
	International companies		624				—			—			624
	Mutual fund equity investments:
	U.S. equity index funds:
	U.S. large-cap equity index funds		2,129				—			—			2,129
	U.S. small-cap equity index funds		2,096				—			—			2,096
	U.S. mid-cap equity index funds		2,928				—			—			2,928
	Non-U.S. equities growth fund		8,972				—			—			8,972
	U.S. equity funds:
	U.S. mid-cap		5,893				—			—			5,893
	U.S. small-cap		2,856				—			—			2,856
	Other		4,280				—			—			4,280
	Fixed income securities:
	U.S. government agencies		—				36,030			—			36,030
	Fixed income mutual funds:
	U.S. investment-grade fixed income securities		8,404				—			—			8,404
	Non-U.S. fixed income securities		503				—			—			503
		$	77,386			$	36,030			—		$	113,416

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2013
Income Tax Disclosure [Abstract]	'
Summary of Income Tax Expense Allocated Based on Separate Tax Return Basis	'
	Income tax expense, allocated based on a separate tax return basis, consists of the following:
	Year Ended December 31	2013			2012			2011
	Current income taxes:
	Federal taxes	$	33,614		$	22,182		$	18,721
	State taxes		(116	)		416			354
			33,498			22,598			19,075
	Deferred income taxes:
	Federal taxes		11,258			21,175			12,929
	State taxes		—			—			—
			11,258			21,175			12,929
		$	44,756		$	43,773		$	32,004
Summary of Reconciliation Between the Statutory Tax Rate and Actual Effective Tax Rate	'
	The following table provides a reconciliation between the statutory tax rate and the actual effective tax rate:
	Year Ended December 31	2013			2012			2011
	Statutory tax rate		35	%		35	%		35	%
	Effect of tax-free interest and dividend income		(4.3	)		(4.7	)		(5.9	)
	Tax credits and settlements		(2.4	)		(1.8	)		(1.9	)
	Life insurance		(0.4	)		—			—
	Other items		(0.4	)		(0.1	)		(0.3	)
	Actual effective tax rate		27.5	%		28.4	%		26.9	%
Summary of Deferred Tax Assets and Liabilities from Tax Effects of Temporary Differences	'
	The following table presents the tax effects of temporary differences that give rise to deferred tax assets and liabilities:
	December 31	2013			2012
	Deferred tax assets:
	Allowance for loan losses	$	39,292		$	36,714
	Discount on purchased loans		41,012			24,339
	Net operating loss/tax credit carryforwards		17,052			15,196
	Deferred compensation		8,208			7,429
	Securities impairments		20,371			19,999
	Pension and other defined benefit plans		2,190			16,335
	Net unrealized securities losses		13,295			—
	Other		3,567			4,268
	Total		144,987			124,280
	Valuation allowance		(15,611	)		(16,329	)
	Total deferred tax assets		129,376			107,951
	Deferred tax liabilities:
	Loan costs		(931	)		(287	)
	Depreciation		(9,819	)		(9,794	)
	Prepaid expenses		(1,261	)		(1,083	)
	Amortizable intangibles		(11,346	)		(8,200	)
	Lease financing		(6,290	)		(4,915	)
	Debt discharge income deferral		(3,402	)		—
	Originated mortgage servicing rights		(2,721	)		—
	Other		(1,214	)		(1,089	)
	Total deferred tax liabilities		(36,984	)		(25,368	)
	Net deferred tax assets	$	92,392		$	82,583
Summary of Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits	'
	A reconciliation of the beginning and ending amount of unrecognized tax benefits (excluding interest and the federal income tax benefit of unrecognized state tax benefits) is as follows:
	Year Ended December 31	2013			2012
	Balance at beginning of year	$	1,088		$	1,376
	Additions based on tax positions related to current year		74			87
	Additions based on tax positions of prior year		—			—
	Reductions for tax positions of prior years		—			—
	Reductions due to expiration of statute of limitations		(502	)		(375	)
	Balance at end of year	$	660		$	1,088

Comprehensive_Income_Tables

Comprehensive Income (Tables)	12 Months Ended
	Dec. 31, 2013
Equity [Abstract]	'
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:
	Year Ended December 31, 2013		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
	Balance at beginning of period		$	9,269		$	(8,039	)	$	(171	)	$	(47,283	)	$	(46,224	)
	Other comprehensive income (loss) before reclassifications			(20,643	)		1,847			(6,415	)		15,011			(10,200	)
	Amounts reclassified from accumulated other comprehensive income			(500	)		—			—			—			(500	)
	Net current period other comprehensive income (loss)			(21,143	)		1,847			(6,415	)		15,011			(10,700	)
	Balance at end of period		$	(11,874	)	$	(6,192	)	$	(6,586	)	$	(32,272	)	$	(56,924	)
Summary of Reclassifications Out of Accumulated Other Comprehensive Income	'
	The following table presents a summary of the reclassifications out of accumulated other comprehensive income:
	Year Ended December 31, 2013
	Details About Accumulated Other		Amount			Affected Line Item
	Comprehensive Income Component		Reclassified  from			in the Statement
			Other			where Net Income
			Comprehensive			is Presented
			Income
	Unrealized net gains on securities available for sale (1)		$	(767	)	Net securities gains
				(267	)	Tax expense
			$	(500	)
	-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_Share_Tables

Earnings per Share (Tables)	12 Months Ended
	Dec. 31, 2013
Earnings Per Share [Abstract]	'
Computation of Basic and Diluted Earnings Per Common Share	'
	The following tables set forth the computation of basic and diluted earnings per common share:
	Year Ended December 31	2013		2012		2011
	Net income available to common stockholders	$	117,804	$	110,410	$	87,047
	Basic weighted average common shares outstanding		146,186,982		139,135,272		124,145,924
	Net effect of dilutive stock options, warrants, restricted stock and convertible debt		1,622,522		1,504,893		866,154
	Diluted weighted average common shares outstanding		147,809,504		140,640,165		125,012,078
	Basic earnings per common share	$	0.81	$	0.79	$	0.7
	Diluted earnings per common share	$	0.8	$	0.79	$	0.7

Regulatory_Matters_Tables

Regulatory Matters (Tables)	12 Months Ended
	Dec. 31, 2013
Banking And Thrift [Abstract]	'
Schedule of Capital Ratios	'
	Following are the capital ratios as of December 31, 2013 and 2012 for the Corporation and FNBPA (dollars in thousands):
		Actual					Well-Capitalized					Minimum  Capital
							Requirements					Requirements
	December 31, 2013	Amount		Ratio			Amount		Ratio			Amount		Ratio
	F.N.B. Corporation:
	Total capital to risk-weighted assets	$	1,258,312		12.5	%	$	1,009,952		10	%	$	807,962		8	%
	Tier 1 capital to risk-weighted assets		1,117,956		11.1			605,971		6			403,981		4
	Leverage ratio		1,117,956		8.8			634,527		5			507,622		4
	FNBPA:
	Total capital to risk-weighted assets		1,144,510		11.5			995,524		10			796,419		8
	Tier 1 capital to risk-weighted assets		1,035,659		10.4			597,314		6			398,210		4
	Leverage ratio		1,035,659		8.3			623,921		5			499,137		4
	December 31, 2012
	F.N.B. Corporation:
	Total capital to risk-weighted assets	$	1,068,704		12.2	%	$	879,316		10	%	$	703,453		8	%
	Tier 1 capital to risk-weighted assets		934,443		10.6			527,589		6			351,726		4
	Leverage ratio		934,443		8.3			563,649		5			450,919		4
	FNBPA:
	Total capital to risk-weighted assets		999,717		11.6			859,468		10			687,574		8
	Tier 1 capital to risk-weighted assets		895,177		10.4			515,681		6			343,787		4
	Leverage ratio		895,177		8.1			555,360		5			444,288		4

Cash_Flow_Information_Tables

Cash Flow Information (Tables)	12 Months Ended
	Dec. 31, 2013
Supplemental Cash Flow Elements [Abstract]	'
Summary of Cash Flow Information	'
	Following is a summary of cash flow information:
	Year Ended December 31	2013		2012		2011
	Interest paid on deposits and other borrowings	$	46,337	$	56,306	$	75,178
	Income taxes paid		34,200		22,250		13,250
	Transfers of loans to other real estate owned		15,836		14,102		21,679
	Transfers of other real estate owned to loans		701		839		598

Business_Segments_Tables

Business Segments (Tables)	12 Months Ended
	Dec. 31, 2013
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			Consolidated
		Banking		Manage-				Finance		and
				ment						Other
	At or for the Year Ended December 31, 2013
	Interest income	$	396,243	$	—	$	109	$	37,956	$	6,078		$	440,386
	Interest expense		32,178		—		—		3,378		8,788			44,344
	Net interest income		364,065		—		109		34,578		(2,710	)		396,042
	Provision for loan losses		23,502		—		—		6,834		754			31,090
	Non-interest income		97,156		28,717		13,175		2,794		(6,064	)		135,778
	Non-interest expense		271,657		25,067		11,448		19,052		2,539			329,763
	Intangible amortization		7,697		304		406		—		—			8,407
	Income tax expense (benefit)		43,966		1,248		519		4,320		(5,297	)		44,756
	Net income (loss)		114,399		2,098		911		7,166		(6,770	)		117,804
	Total assets		13,381,047		20,959		20,214		188,259		(47,074	)		13,563,405
	Total intangibles		788,513		11,008		10,526		1,809		—			811,856
	At or for the Year Ended December 31, 2012
	Interest income	$	390,680	$	4	$	113	$	35,279	$	5,830		$	431,906
	Interest expense		45,604		—		—		3,584		9,867			59,055
	Net interest income		345,076		4		113		31,695		(4,037	)		372,851
	Provision for loan losses		24,606		—		—		6,115		581			31,302
	Non-interest income		96,853		24,152		13,035		2,343		(5,131	)		131,252
	Non-interest expense		258,063		20,141		11,503		18,410		1,577			309,694
	Intangible amortization		8,184		320		420		—		—			8,924
	Income tax expense (benefit)		42,991		1,358		438		3,615		(4,629	)		43,773
	Net income (loss)		108,085		2,337		787		5,898		(6,697	)		110,410
	Total assets		11,845,122		19,610		18,675		178,149		(37,580	)		12,023,976
	Total intangibles		689,354		11,312		10,931		1,809		—			713,406
	At or for the Year Ended December 31, 2011
	Interest income	$	350,801	$	11	$	124	$	34,168	$	6,021		$	391,125
	Interest expense		60,132		—		—		4,281		10,204			74,617
	Net interest income		290,669		11		124		29,887		(4,183	)		316,508
	Provision for loan losses		26,957		—		—		6,152		532			33,641
	Non-interest income		88,172		23,238		12,325		2,132		(6,137	)		119,730
	Non-interest expense		227,696		18,518		11,568		17,210		1,514			276,506
	Intangible amortization		6,279		335		426		—		—			7,040
	Income tax expense (benefit)		31,869		1,587		169		3,274		(4,895	)		32,004
	Net income (loss)		86,040		2,809		286		5,383		(7,471	)		87,047
	Total assets		9,583,439		19,579		17,301		171,350		(5,186	)		9,786,483
	Total intangibles		574,622		11,632		11,352		1,809		—			599,415

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2013
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
	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
		Level 1			Level 2			Level 3			Total
	December 31, 2012
	Assets measured at fair value
	Available for sale debt securities
	U.S. government-sponsored entities	$	—		$	354,457		$	—		$	354,457
	Residential mortgage-backed securities
	Agency mortgage-backed securities		—			275,150			—			275,150
	Agency collateralized mortgage obligations		—			469,547			—			469,547
	Non-agency collateralized mortgage obligations		—			24			2,705			2,729
	States of the U.S. and political subdivisions		—			24,824			—			24,824
	Collateralized debt obligations		—			—			22,456			22,456
	Other debt securities		—			14,621			6,892			21,513
			—			1,138,623			32,053			1,170,676
	Available for sale equity securities
	Financial services industry		351			1,099			512			1,962
	Insurance services industry		45			—			—			45
			396			1,099			512			2,007
			396			1,139,722			32,565			1,172,683
	Derivative financial instruments
	Trading		—			58,008			—			58,008
	Not for trading		—			—			—			—
			—			58,008			—			58,008
		$	396		$	1,197,730		$	32,565		$	1,230,691
	Liabilities measured at fair value
	Derivative financial instruments
	Trading		—		$	58,150			—		$	58,150
	Not for trading		—			—			—			—
			—		$	58,150			—		$	58,150
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
	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
	Year Ended December 31, 2012
	Balance at beginning of period	$	5,998		$	5,197		$	408		$	—		$	11,603
	Total gains (losses) – realized/unrealized:
	Included in earnings		—			—			—			—			—
	Included in other comprehensive income		917			732			104			49			1,802
	Accretion included in earnings		2,515			9			—			20			2,544
	Purchases, issuances, sales and settlements:
	Purchases		16,569			954			—			4,230			21,753
	Issuances		46			—			—			—			46
	Sales/redemptions		(2,542	)		—			—			—			(2,542	)
	Settlements		(1,047	)		—			—			(1,594	)		(2,641	)
	Transfers from Level 3		—			—			—			—			—
	Transfers into Level 3		—			—			—			—			—
	Balance at end of period	$	22,456		$	6,892		$	512		$	2,705		$	32,565
Additional Information about Assets Measured at Fair Value on Non-Recurring Basis	'
	The following table provides the hierarchy level and the fair value of the related assets or portfolios. These amounts represent the fair values at the time the non-recurring fair value measurements were made, and not necessarily the fair value as of the dates reported upon.
		Level 1			Level 2			Level 3			Total
	December 31, 2013
	Impaired loans		—		$	3,235		$	59		$	3,294
	Other real estate owned		—			4,485			14,957			19,442
	December 31, 2012
	Impaired loans		—		$	14,325		$	3,171		$	17,496
	Other real estate owned		—			5,771			13,540			19,311
	Investment security, held-to-maturity:
	Non-agency CMO		—			—			3,636			3,636
Fair Values of Corporation's Financial Instruments	'
	The fair values of the Corporation’s financial instruments are as follows:
								Fair Value Measurements
		Carrying			Fair Value			Level 1			Level 2			Level 3
		Amount
	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		9,402,448			9,243,780			—			—			9,243,780
	held for sale
	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			—			—
	December 31, 2012
	Financial Assets
	Cash and cash equivalents	$	239,044		$	239,044		$	239,044		$	—		$	—
	Securities available for sale		1,172,683			1,172,683			396			1,139,722			32,565
	Securities held to maturity		1,106,563			1,143,213			—			1,128,524			14,689
	Net loans, including loans		8,061,096			7,996,554			—			—			7,966,554
	held for sale
	Bank owned life insurance		246,088			257,060			257,060			—			—
	Derivative assets		58,008			58,008			—			58,008			—
	Accrued interest receivable		30,210			30,210			30,210			—			—
	Financial Liabilities
	Deposits		9,082,174			9,117,757			6,546,316			2,571,441			—
	Short-term borrowings		1,083,138			1,083,138			1,083,138			—			—
	Long-term debt		89,425			92,329			—			—			92,329
	Junior subordinated debt		204,019			172,246			—			—			172,246
	Derivative liabilities		58,150			58,150			—			58,150			—
	Accrued interest payable		9,054			9,054			9,054			—			—

Parent_Company_Financial_State1

Parent Company Financial Statements (Tables)	12 Months Ended
	Dec. 31, 2013
Condensed Financial Information Of Parent Company Only Disclosure [Abstract]	'
Consolidated Balance Sheet of Parent Company Only	'
	Balance Sheets	2013			2012
	December 31
	Assets
	Cash and cash equivalents	$	145,910		$	114,654
	Securities available for sale		2,061			1,962
	Other assets		18,387			15,856
	Investment in bank subsidiary		1,759,551			1,554,543
	Investments in and advances to non-bank subsidiaries		254,124			253,807
	Total Assets	$	2,180,033		$	1,940,822
	Liabilities
	Other liabilities	$	25,225		$	28,381
	Advances from affiliates		294,245			295,100
	Junior subordinated debt		76,290			205,156
	Subordinated notes:
	Short-term		8,439			8,355
	Long-term		1,451			1,761
	Total Liabilities		405,650			538,753
	Stockholders’ Equity		1,774,383			1,402,069
	Total Liabilities and Stockholders’ Equity	$	2,180,033		$	1,940,822
Statements of Income of Parent Company Only	'
	Statements of Income	2013			2012			2011
	Year Ended December 31
	Income
	Dividend income from subsidiaries:
	Bank	$	77,153		$	74,412		$	65,130
	Non-bank		5,950			6,400			8,638
			83,103			80,812			73,768
	Interest income		5,277			5,802			6,172
	Other income		1,874			1,442			71
	Total Income		90,254			88,056			80,011
	Expenses
	Interest expense		14,325			15,646			16,744
	Other expenses		8,196			7,640			6,197
	Total Expenses		22,521			23,286			22,941
	Income Before Taxes and Equity in Undistributed Income of Subsidiaries		67,733			64,770			57,070
	Income tax benefit		6,267			6,151			6,296
			74,000			70,921			63,366
	Equity in undistributed income (loss) of subsidiaries:
	Bank		42,094			38,401			25,508
	Non-bank		1,710			1,088			(1,827	)
	Net Income	$	117,804		$	110,410		$	87,047
Statements of Cash Flows of Parent Company Only	'
	Statements of Cash Flows	2013			2012			2011
	Year Ended December 31
	Operating Activities
	Net income	$	117,804		$	110,410		$	87,047
	Adjustments to reconcile net income to net cash flows from operating activities:
	Undistributed earnings from subsidiaries		(43,804	)		(39,489	)		(23,681	)
	Other, net		(6,218	)		109			8,666
	Net cash flows provided by operating activities		67,782			71,030			72,032
	Investing Activities
	Proceeds from sale of securities available for sale		128			201			389
	(Increase) decrease in property, plant and equipment		—			4,193			(243	)
	Net decrease (increase) in advances to subsidiaries		1,080			(1,349	)		(7,551	)
	Net increase in investment in subsidiaries		(1,688	)		(79,450	)		(16,611	)
	Net cash flows used in investing activities		(480	)		(76,405	)		(24,016	)
	Financing Activities
	Net (decrease) increase in advance from affiliate		(854	)		12,944			16,900
	Net increase (decrease) in short-term borrowings		84			(2	)		(316	)
	Decrease in long-term debt		(808	)		(1,277	)		(1,206	)
	Increase in long-term debt		499			671			798
	Decrease in junior subordinated debt		(134,021	)		—			—
	Net proceeds from issuance of preferred stock		106,882			—			—
	Net proceeds from issuance of common stock		62,092			8,895			71,053
	Tax benefit (expense) of stock-based compensation		1,326			386			(61	)
	Cash dividends paid		(71,246	)		(67,646	)		(60,686	)
	Net cash flows (used in) provided by financing activities		(36,046	)		(46,029	)		26,482
	Net Increase (Decrease) in Cash and Cash Equivalents		31,256			(51,404	)		74,498
	Cash and cash equivalents at beginning of year		114,654			166,058			91,560
	Cash and Cash Equivalents at End of Year	$	145,910		$	114,654		$	166,058
	Cash paid during the year for:
	Interest	$	14,345		$	15,690		$	16,768

Nature_Of_Operations_Additiona

Nature Of Operations (Additional Information) (Detail)	12 Months Ended
	Dec. 31, 2013
	Office
Organization Consolidation And Presentation Of Financial Statements [Abstract]	'
Number of consumer finance offices	72
Number of banking offices	266

Summary_of_Significant_Account2

Summary of Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2013
Summary Of Significant Accounting Policies [Line Items]	'
Number of days past due for loan to be in default	'90 days
Core deposit intangibles amortization period, years	'10 years
Largest amount recognized in the financial statement of tax benefit threshold, minimum	50.00%
Installment Loans [Member]	'
Summary Of Significant Accounting Policies [Line Items]	'
Number of days placed on non- accrual	'120 days
Residential Mortgages [Member]	'
Summary Of Significant Accounting Policies [Line Items]	'
Number of days placed on non- accrual	'180 days
Commercial Loans [Member]	'
Summary Of Significant Accounting Policies [Line Items]	'
Number of days placed on non- accrual	'90 days
Minimum [Member]	'
Summary Of Significant Accounting Policies [Line Items]	'
Useful life of the asset, years	'3 years
Estimated useful life of intangibles, years	'10 years
Maximum [Member]	'
Summary Of Significant Accounting Policies [Line Items]	'
Useful life of the asset, years	'40 years
Estimated useful life of intangibles, years	'12 years

Mergers_and_Acquisitions_Addit

Mergers and Acquisitions - Additional Information (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Jan. 02, 2012	Dec. 31, 2013	Feb. 15, 2014	Oct. 12, 2013	Apr. 06, 2013
In Thousands, except Share data, unless otherwise specified				Parkvale Financial Corporation [Member]	BCSB Bancorp, Inc. (BCSB) [Member]	BCSB Bancorp, Inc. (BCSB) [Member]	PVF Capital Corp (PVF) [Member]	Annapolis Bancorp, Inc. [Member]
						Subsequent Event [Member]
Business Acquisition [Line Items]	'	'	'	'	'	'	'	'
Assets acquired as a result of merger	'	'	'	$1,743,885	$605,901	'	$738,486	$430,217
Loans acquired as a result of merger	'	'	'	919,480	326,258	'	512,566	256,199
Deposits acquired as a result of merger	'	'	'	1,525,253	531,563	'	627,046	349,370
Value of acquisition	'	'	'	140,900	'	81,205	109,856	56,300
Common shares issued	'	'	'	12,159,312	'	6,730,597	8,893,598	4,641,412
Common shares acquired	'	'	'	5,582,846	'	3,235,961	26,119,398	4,060,802
Goodwill recorded as a result of merger	764,248	675,555	568,462	106,602	'	'	51,284	37,410
Core deposit intangibles recorded as result of the acquisition	'	'	'	16,033	'	'	6,867	3,775
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	'	'	'	819,640	'	'	'	342,564
Warrant expiration date	'	'	'	23-Dec-18	'	'	'	30-Jan-19
Warrant exercise price	'	'	'	5.81	'	'	'	3.57

Mergers_and_Acquisitions_Amoun

Mergers and Acquisitions - Amounts Recorded on Consolidated Balance Sheet in Conjunction with Acquisition (Detail) (USD $)	0 Months Ended
In Thousands, unless otherwise specified	Jan. 02, 2012	Apr. 06, 2013	Oct. 12, 2013
	Parkvale Financial Corporation [Member]	Annapolis Bancorp, Inc. [Member]	PVF Capital Corp (PVF) [Member]
Business Acquisition [Line Items]	'	'	'
Common stock issued, net of offering costs	$136,441	$54,065	$109,856
Warrant assumed	4,459	2,235	'
Total consideration paid	140,900	56,300	109,856
Cash and cash equivalents	203,538	41,986	99,650
Securities	486,186	99,309	47,258
Loans	919,480	256,199	512,566
Other intangible assets	16,033	3,775	15,288
Accrued income and other assets	118,648	28,948	63,724
Total identifiable assets acquired	1,743,885	430,217	738,486
Deposits	1,525,253	349,370	627,046
Borrowings	171,606	58,204	37,241
Accrued expenses and other liabilities	12,728	3,753	15,627
Total liabilities assumed	1,709,587	411,327	679,914
Fair value of net identifiable assets acquired	34,298	18,890	58,572
Goodwill recognized	$106,602	$37,410	$51,284

Mergers_and_Acquisitions_Pro_F

Mergers and Acquisitions - Pro Forma Information Estimated (Detail) (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2011
Business Acquisition Pro Forma Information [Abstract]	'
Revenue (net interest income and non-interest income)	$486,818
Net income	96,299
Net income available to common stockholders	$94,711
Earnings per common share - basic	$0.69
Earnings per common share - diluted	$0.69

Securities_Schedule_of_Amortiz

Securities - Schedule of Amortized Cost and Fair Value of Securities Available for Sale (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'	'	'
Securities Available For Sale, Amortized Cost	$1,169,482	$1,170,439	$645,658
Securities Available For Sale, Gross Unrealized Gains	11,463	16,858	9,829
Securities Available For Sale, Gross Unrealized Losses	-39,295	-14,614	-14,916
Assets measured at fair value, Available for sale securities	1,141,650	1,172,683	640,571
U.S. Government-Sponsored Entities [Member]	'	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'	'
Securities Available For Sale, Amortized Cost	336,763	352,910	231,187
Securities Available For Sale, Gross Unrealized Gains	126	1,676	642
Securities Available For Sale, Gross Unrealized Losses	-5,904	-129	'
Assets measured at fair value, Available for sale securities	330,985	354,457	231,829
Agency Mortgage-Backed Securities [Member]	'	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'	'
Securities Available For Sale, Amortized Cost	247,880	267,575	166,758
Securities Available For Sale, Gross Unrealized Gains	4,304	7,575	4,853
Securities Available For Sale, Gross Unrealized Losses	-1,303	'	'
Assets measured at fair value, Available for sale securities	250,881	275,150	171,611
Agency Collateralized Mortgage Obligations [Member]	'	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'	'
Securities Available For Sale, Amortized Cost	511,098	465,574	181,493
Securities Available For Sale, Gross Unrealized Gains	895	4,201	2,236
Securities Available For Sale, Gross Unrealized Losses	-20,794	-228	'
Assets measured at fair value, Available for sale securities	491,199	469,547	183,729
Non-Agency Collateralized Mortgage Obligations [Member]	'	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'	'
Securities Available For Sale, Amortized Cost	1,747	2,679	31
Securities Available For Sale, Gross Unrealized Gains	15	50	'
Securities Available For Sale, Gross Unrealized Losses	'	'	-1
Assets measured at fair value, Available for sale securities	1,762	2,729	30
States of the U.S. and Political Subdivisions [Member]	'	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'	'
Securities Available For Sale, Amortized Cost	16,842	23,592	38,509
Securities Available For Sale, Gross Unrealized Gains	410	1,232	1,841
Securities Available For Sale, Gross Unrealized Losses	-250	'	'
Assets measured at fair value, Available for sale securities	17,002	24,824	40,350
Collateralized Debt Obligations [Member]	'	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'	'
Securities Available For Sale, Amortized Cost	37,203	34,765	19,224
Securities Available For Sale, Gross Unrealized Gains	4,507	967	'
Securities Available For Sale, Gross Unrealized Losses	-10,115	-13,276	-13,226
Assets measured at fair value, Available for sale securities	31,595	22,456	5,998
Other Debt Securities [Member]	'	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'	'
Securities Available For Sale, Amortized Cost	16,505	21,790	6,863
Securities Available For Sale, Gross Unrealized Gains	524	695	'
Securities Available For Sale, Gross Unrealized Losses	-929	-972	-1,666
Assets measured at fair value, Available for sale securities	16,100	21,513	5,197
Debt securities [Member]	'	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'	'
Securities Available For Sale, Amortized Cost	1,168,038	1,168,885	644,065
Securities Available For Sale, Gross Unrealized Gains	10,781	16,396	9,572
Securities Available For Sale, Gross Unrealized Losses	-39,295	-14,605	-14,893
Assets measured at fair value, Available for sale securities	1,139,524	1,170,676	638,744
Equity securities [Member]	'	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'	'
Securities Available For Sale, Amortized Cost	1,444	1,554	1,593
Securities Available For Sale, Gross Unrealized Gains	682	462	257
Securities Available For Sale, Gross Unrealized Losses	'	-9	-23
Assets measured at fair value, Available for sale securities	$2,126	$2,007	$1,827

Securities_Schedule_of_Amortiz1

Securities - Schedule of Amortized Cost and Fair Value of Securities Held to Maturity (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Investment Securities Held To Maturity [Line Items]	'	'	'
Securities Held To Maturity, Amortized Cost	$1,199,169	$1,106,563	$917,212
Securities Held To Maturity, Gross Unrealized Gains	15,484	36,785	36,700
Securities Held To Maturity, Gross Unrealized Losses	-25,090	-135	-1,879
Securities Held To Maturity, Fair Value	1,189,563	1,143,213	952,033
U.S. Treasury [Member]	'	'	'
Investment Securities Held To Maturity [Line Items]	'	'	'
Securities Held To Maturity, Amortized Cost	503	503	504
Securities Held To Maturity, Gross Unrealized Gains	99	188	185
Securities Held To Maturity, Gross Unrealized Losses	'	'	'
Securities Held To Maturity, Fair Value	602	691	689
U.S. Government-Sponsored Entities [Member]	'	'	'
Investment Securities Held To Maturity [Line Items]	'	'	'
Securities Held To Maturity, Amortized Cost	43,322	28,731	4,019
Securities Held To Maturity, Gross Unrealized Gains	180	280	175
Securities Held To Maturity, Gross Unrealized Losses	-1,151	-99	'
Securities Held To Maturity, Fair Value	42,351	28,912	4,194
Agency Mortgage-Backed Securities [Member]	'	'	'
Investment Securities Held To Maturity [Line Items]	'	'	'
Securities Held To Maturity, Amortized Cost	628,681	780,022	683,100
Securities Held To Maturity, Gross Unrealized Gains	12,281	28,783	28,722
Securities Held To Maturity, Gross Unrealized Losses	-6,032	-1	'
Securities Held To Maturity, Fair Value	634,930	808,804	711,822
Agency Collateralized Mortgage Obligations [Member]	'	'	'
Investment Securities Held To Maturity [Line Items]	'	'	'
Securities Held To Maturity, Amortized Cost	385,408	133,976	54,319
Securities Held To Maturity, Gross Unrealized Gains	764	1,266	573
Securities Held To Maturity, Gross Unrealized Losses	-15,844	'	-11
Securities Held To Maturity, Fair Value	370,328	135,242	54,881
Non-Agency Collateralized Mortgage Obligations [Member]	'	'	'
Investment Securities Held To Maturity [Line Items]	'	'	'
Securities Held To Maturity, Amortized Cost	6,852	14,082	24,348
Securities Held To Maturity, Gross Unrealized Gains	44	130	143
Securities Held To Maturity, Gross Unrealized Losses	-4	'	-1,373
Securities Held To Maturity, Fair Value	6,892	14,212	23,118
Commercial Mortgage-Backed Securities [Member]	'	'	'
Investment Securities Held To Maturity [Line Items]	'	'	'
Securities Held To Maturity, Amortized Cost	2,241	1,024	'
Securities Held To Maturity, Gross Unrealized Gains	124	39	'
Securities Held To Maturity, Gross Unrealized Losses	-37	'	'
Securities Held To Maturity, Fair Value	2,328	1,063	'
States of the U.S. and Political Subdivisions [Member]	'	'	'
Investment Securities Held To Maturity [Line Items]	'	'	'
Securities Held To Maturity, Amortized Cost	132,162	147,713	147,748
Securities Held To Maturity, Gross Unrealized Gains	1,992	6,099	6,877
Securities Held To Maturity, Gross Unrealized Losses	-2,022	'	'
Securities Held To Maturity, Fair Value	132,132	153,812	154,625
Collateralized Debt Obligations [Member]	'	'	'
Investment Securities Held To Maturity [Line Items]	'	'	'
Securities Held To Maturity, Amortized Cost	'	512	1,592
Securities Held To Maturity, Gross Unrealized Gains	'	'	'
Securities Held To Maturity, Gross Unrealized Losses	'	-35	-314
Securities Held To Maturity, Fair Value	'	477	1,278
Other Debt Securities [Member]	'	'	'
Investment Securities Held To Maturity [Line Items]	'	'	'
Securities Held To Maturity, Amortized Cost	'	'	1,582
Securities Held To Maturity, Gross Unrealized Gains	'	'	25
Securities Held To Maturity, Gross Unrealized Losses	'	'	-181
Securities Held To Maturity, Fair Value	'	'	$1,426

Securities_Gross_Gains_and_Gro

Securities - Gross Gains and Gross Losses Realized on Sales of Securities (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Investments Debt And Equity Securities [Abstract]	'	'	'
Gross gains	$1,200	$1,154	$3,848
Gross losses	-392	-849	-196
Total	$808	$305	$3,652

Securities_Additional_Informat

Securities - Additional Information (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
	Security
Schedule Of Securities [Line Items]	'	'	'
Gross gains relating to sale of securities	'	'	$3,415
Total securities sold	22,047	87,101	101,973
Securities pledged to secure public deposits, trust deposits and for other purposes, carrying value	909,548	725,450	'
Securities pledged as collateral for short-term borrowings, carrying value	860,279	795,812	'
Recover rate of banks	10.00%	'	'
Recover rate of insurance companies	15.00%	'	'
Number of pooled issue securities	23	'	'
Number of single-issuer securities	4	'	'
Estimated fair value of pooled trust preferred securities	31,595	'	'
Estimated fair value of single-issue trust preferred securities	5,950	'	'
Accretion income recognized by Corporation	3,338	2,831	'
Number of current pooled trust preferred securities	4	'	'
Remaining non-accrual pooled trust preferred securities	2	'	'
Accruing pooled trust preferred securities	3	'	'
Number of pooled securities accreting income	18	'	'
Additional accretion income recognized	'	34	'
Impairment losses on securities	27	212	'
Municipal bond portfolio, value	149,164	'	'
Percent of municipal bond portfolio rated A or better	99.20%	'	'
Percent of municipal bond portfolio, general obligation bonds	98.90%	'	'
Percent of municipal bonds from Pennsylvania	79.00%	'	'
Average holding size of municipal bond	1,001	'	'
Percent of portfolio with credit support	67.00%	'	'
Preferred Trust Securities [Member]	'	'	'
Schedule Of Securities [Line Items]	'	'	'
Number of pooled trust preferred securities sold	'	2	'
U.S. Government Agency Security [Member]	'	'	'
Schedule Of Securities [Line Items]	'	'	'
Total securities sold	'	'	3,940
Agency Mortgage-Backed Securities [Member]	'	'	'
Schedule Of Securities [Line Items]	'	'	'
Total securities sold	'	'	$83,736
Senior Tranches [Member]	'	'	'
Schedule Of Securities [Line Items]	'	'	'
Number of single-issuer securities	2	'	'
Mezzanine Tranches [Member]	'	'	'
Schedule Of Securities [Line Items]	'	'	'
Number of pooled issue securities	21	'	'
Minimum [Member]	'	'	'
Schedule Of Securities [Line Items]	'	'	'
Deferral rates after the deferral period ends	10.00%	'	'
Maximum [Member]	'	'	'
Schedule Of Securities [Line Items]	'	'	'
Deferral rates after the deferral period ends	90.00%	'	'

Securities_Amortized_Cost_and_

Securities - Amortized Cost and Fair Value of Securities, by Contractual Maturities (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
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	281,854	'	'
Available for Sale, Due from five to ten years, Amortized Cost	79,155	'	'
Available for Sale, Due after ten years, Amortized Cost	46,304	'	'
Available for Sale, with contractual maturities, Amortized Cost	407,313	'	'
Total securities available for sale, Amortized Cost	1,169,482	1,170,439	645,658
Available for Sale, Due in one year or less, Fair Value	'	'	'
Available for Sale, Due from one to five years, Fair Value	278,833	'	'
Available for Sale, Due from five to ten years, Fair Value	77,071	'	'
Available for Sale, Due after ten years, Fair Value	39,778	'	'
Available for Sale, with contractual maturities, Fair Value	395,682	'	'
Total available for sale Securities, Fair Value	1,141,650	1,172,683	640,571
Held to Maturity, Due in one year or less, Amortized Cost	3,376	'	'
Held to Maturity, Due from one to five years, Amortized Cost	47,666	'	'
Held to Maturity, Due from five to ten years, Amortized Cost	51,161	'	'
Held to Maturity, Due after ten years, Amortized Cost	73,784	'	'
Securities Held To Maturity, with contractual maturities, Amortized Cost	175,987	'	'
Held to Maturity, with contractual maturities, Amortized Cost	1,199,169	1,106,563	917,212
Held to Maturity, Due in one year or less, Fair Value	3,421	'	'
Held to Maturity, Due from one to five years, Fair Value	46,735	'	'
Held to Maturity, Due from five to ten years, Fair Value	51,798	'	'
Held to Maturity, Due after ten years, Fair Value	73,131	'	'
Securities Held To Maturity, with contractual maturities, Fair Value	175,085	'	'
Held to Maturity, with contractual maturities, Fair Value	1,189,563	1,143,213	952,033
Agency Mortgage-Backed Securities [Member]	'	'	'
Schedule Of Securities [Line Items]	'	'	'
Total securities available for sale, Amortized Cost	247,880	267,575	166,758
Total available for sale Securities, Fair Value	250,881	275,150	171,611
Held to Maturity, with contractual maturities, Amortized Cost	628,681	780,022	683,100
Held to Maturity, with contractual maturities, Fair Value	634,930	808,804	711,822
Agency Collateralized Mortgage Obligations [Member]	'	'	'
Schedule Of Securities [Line Items]	'	'	'
Total securities available for sale, Amortized Cost	511,098	465,574	181,493
Total available for sale Securities, Fair Value	491,199	469,547	183,729
Held to Maturity, with contractual maturities, Amortized Cost	385,408	133,976	54,319
Held to Maturity, with contractual maturities, Fair Value	370,328	135,242	54,881
Non-Agency Collateralized Mortgage Obligations [Member]	'	'	'
Schedule Of Securities [Line Items]	'	'	'
Total securities available for sale, Amortized Cost	1,747	2,679	31
Total available for sale Securities, Fair Value	1,762	2,729	30
Held to Maturity, with contractual maturities, Amortized Cost	6,852	14,082	24,348
Held to Maturity, with contractual maturities, Fair Value	6,892	14,212	23,118
Commercial Mortgage-Backed Securities [Member]	'	'	'
Schedule Of Securities [Line Items]	'	'	'
Total securities available for sale, Amortized Cost	'	'	'
Total available for sale Securities, Fair Value	'	'	'
Held to Maturity, with contractual maturities, Amortized Cost	2,241	1,024	'
Held to Maturity, with contractual maturities, Fair Value	2,328	1,063	'
Equity securities [Member]	'	'	'
Schedule Of Securities [Line Items]	'	'	'
Total securities available for sale, Amortized Cost	1,444	1,554	1,593
Total available for sale Securities, Fair Value	2,126	2,007	1,827
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 $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified	Security	Security
Schedule Of Securities [Line Items]	'	'	'
Number of available for sale securities, Less than 1 year	54	14	'
Number of available for sale securities, Greater than 1 year	14	13	'
Number of available for sale securities	68	27	'
Securities Available For Sale, Less than 12 Months, Fair Value	$734,257	$101,404	'
Securities Available For Sale, Less than 12 Months, Unrealized Losses	-26,101	-1,275	'
Securities Available For Sale, 12 Months or More, Fair Value	48,144	11,431	'
Securities Available For Sale, 12 Months or More, Unrealized Losses	-13,194	-13,339	'
Securities Available For Sale, Fair Value, Total	782,401	112,835	'
Securities Available For Sale, Unrealized Losses, Total	-39,295	-14,614	'
Number of held to maturity securities	80	3	'
Securities Held To Maturity, Less than 12 Months, Fair Value	669,220	16,325	'
Securities Held To Maturity, Less than 12 Months, Unrealized Losses	-24,379	-100	'
Securities Held To Maturity, Greater than 12 Months, Fair Value	15,674	477	'
Securities Held To Maturity, Greater than 12 Months, Unrealized Losses	-711	-35	'
Securities Held To Maturity, Fair Value, Total	684,894	16,802	'
Securities Held To Maturity, Unrealized Losses, Total	-25,090	-135	-1,879
Less than 12 Months [Member]	'	'	'
Schedule Of Securities [Line Items]	'	'	'
Number of held to maturity securities	78	2	'
Greater than 12 Months [Member]	'	'	'
Schedule Of Securities [Line Items]	'	'	'
Number of held to maturity securities	2	1	'
U.S. Government-Sponsored Entities [Member]	'	'	'
Schedule Of Securities [Line Items]	'	'	'
Number of available for sale securities, Less than 1 year	17	3	'
Number of available for sale securities, Greater than 1 year	'	'	'
Number of available for sale securities	17	3	'
Securities Available For Sale, Less than 12 Months, Fair Value	232,962	44,868	'
Securities Available For Sale, Less than 12 Months, Unrealized Losses	-5,904	-129	'
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	232,962	44,868	'
Securities Available For Sale, Unrealized Losses, Total	-5,904	-129	'
Number of held to maturity securities	3	1	'
Securities Held To Maturity, Less than 12 Months, Fair Value	24,513	14,901	'
Securities Held To Maturity, Less than 12 Months, Unrealized Losses	-530	-99	'
Securities Held To Maturity, Greater than 12 Months, Fair Value	14,378	'	'
Securities Held To Maturity, Greater than 12 Months, Unrealized Losses	-621	'	'
Securities Held To Maturity, Fair Value, Total	38,891	14,901	'
Securities Held To Maturity, Unrealized Losses, Total	-1,151	-99	'
U.S. Government-Sponsored Entities [Member] | Less than 12 Months [Member]	'	'	'
Schedule Of Securities [Line Items]	'	'	'
Number of held to maturity securities	2	1	'
U.S. Government-Sponsored Entities [Member] | Greater than 12 Months [Member]	'	'	'
Schedule Of Securities [Line Items]	'	'	'
Number of held to maturity securities	1	'	'
Agency Mortgage-Backed Securities [Member]	'	'	'
Schedule Of Securities [Line Items]	'	'	'
Number of available for sale securities, Less than 1 year	9	'	'
Number of available for sale securities, Greater than 1 year	'	'	'
Number of available for sale securities	9	'	'
Securities Available For Sale, Less than 12 Months, Fair Value	108,284	'	'
Securities Available For Sale, Less than 12 Months, Unrealized Losses	-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	108,284	'	'
Securities Available For Sale, Unrealized Losses, Total	-1,303	'	'
Number of held to maturity securities	25	1	'
Securities Held To Maturity, Less than 12 Months, Fair Value	308,864	1,424	'
Securities Held To Maturity, Less than 12 Months, Unrealized Losses	-5,942	-1	'
Securities Held To Maturity, Greater than 12 Months, Fair Value	1,296	'	'
Securities Held To Maturity, Greater than 12 Months, Unrealized Losses	-90	'	'
Securities Held To Maturity, Fair Value, Total	310,160	1,424	'
Securities Held To Maturity, Unrealized Losses, Total	-6,032	-1	'
Agency Mortgage-Backed Securities [Member] | Less than 12 Months [Member]	'	'	'
Schedule Of Securities [Line Items]	'	'	'
Number of held to maturity securities	24	1	'
Agency Mortgage-Backed Securities [Member] | Greater than 12 Months [Member]	'	'	'
Schedule Of Securities [Line Items]	'	'	'
Number of held to maturity securities	1	'	'
Agency Collateralized Mortgage Obligations [Member]	'	'	'
Schedule Of Securities [Line Items]	'	'	'
Number of available for sale securities, Less than 1 year	26	3	'
Number of available for sale securities, Greater than 1 year	2	'	'
Number of available for sale securities	28	3	'
Securities Available For Sale, Less than 12 Months, Fair Value	389,989	47,174	'
Securities Available For Sale, Less than 12 Months, Unrealized Losses	-18,644	-228	'
Securities Available For Sale, 12 Months or More, Fair Value	34,229	'	'
Securities Available For Sale, 12 Months or More, Unrealized Losses	-2,150	'	'
Securities Available For Sale, Fair Value, Total	424,218	47,174	'
Securities Available For Sale, Unrealized Losses, Total	-20,794	-228	'
Number of held to maturity securities	21	'	'
Securities Held To Maturity, Less than 12 Months, Fair Value	301,312	'	'
Securities Held To Maturity, Less than 12 Months, Unrealized Losses	-15,844	'	'
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	301,312	'	'
Securities Held To Maturity, Unrealized Losses, Total	-15,844	'	-11
Agency Collateralized Mortgage Obligations [Member] | Less than 12 Months [Member]	'	'	'
Schedule Of Securities [Line Items]	'	'	'
Number of held to maturity securities	21	'	'
Agency Collateralized Mortgage Obligations [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	'	'	'
Number of available for sale securities	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	'	'	'
Securities Available For Sale, 12 Months or More, Unrealized Losses	'	'	'
Securities Available For Sale, Fair Value, Total	3,022	'	'
Securities Available For Sale, Unrealized Losses, Total	-250	'	'
Number of held to maturity securities	27	'	'
Securities Held To Maturity, Less than 12 Months, Fair Value	31,537	'	'
Securities Held To Maturity, Less than 12 Months, Unrealized Losses	-2,022	'	'
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	31,537	'	'
Securities Held To Maturity, Unrealized Losses, Total	-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	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	'	'	'
Collateralized Debt Obligations [Member]	'	'	'
Schedule Of Securities [Line Items]	'	'	'
Number of available for sale securities, Less than 1 year	'	7	'
Number of available for sale securities, Greater than 1 year	8	9	'
Number of available for sale securities	8	16	'
Securities Available For Sale, Less than 12 Months, Fair Value	'	8,708	'
Securities Available For Sale, Less than 12 Months, Unrealized Losses	'	-909	'
Securities Available For Sale, 12 Months or More, Fair Value	7,965	5,532	'
Securities Available For Sale, 12 Months or More, Unrealized Losses	-10,115	-12,367	'
Securities Available For Sale, Fair Value, Total	7,965	14,240	'
Securities Available For Sale, Unrealized Losses, Total	-10,115	-13,276	'
Number of held to maturity securities	'	1	'
Securities Held To Maturity, Less than 12 Months, Fair Value	'	'	'
Securities Held To Maturity, Less than 12 Months, Unrealized Losses	'	'	'
Securities Held To Maturity, Greater than 12 Months, Fair Value	'	477	'
Securities Held To Maturity, Greater than 12 Months, Unrealized Losses	'	-35	'
Securities Held To Maturity, Fair Value, Total	'	477	'
Securities Held To Maturity, Unrealized Losses, Total	'	-35	-314
Collateralized Debt Obligations [Member] | Less than 12 Months [Member]	'	'	'
Schedule Of Securities [Line Items]	'	'	'
Number of held to maturity securities	'	'	'
Collateralized Debt Obligations [Member] | Greater than 12 Months [Member]	'	'	'
Schedule Of Securities [Line Items]	'	'	'
Number of held to maturity securities	'	1	'
Other Debt Securities [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	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	5,950	5,899	'
Securities Available For Sale, 12 Months or More, Unrealized Losses	-929	-972	'
Securities Available For Sale, Fair Value, Total	5,950	5,899	'
Securities Available For Sale, Unrealized Losses, Total	-929	-972	'
Securities Held To Maturity, Unrealized Losses, Total	'	'	-181
Equity 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	'	654	'
Securities Available For Sale, Less than 12 Months, Unrealized Losses	'	-9	'
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	'	654	'
Securities Available For Sale, Unrealized Losses, Total	'	-9	'
Non-Agency Collateralized Mortgage Obligations [Member]	'	'	'
Schedule Of Securities [Line Items]	'	'	'
Number of held to maturity securities	3	'	'
Securities Held To Maturity, Less than 12 Months, Fair Value	2,010	'	'
Securities Held To Maturity, Less than 12 Months, Unrealized Losses	-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	2,010	'	'
Securities Held To Maturity, Unrealized Losses, Total	-4	'	-1,373
Non-Agency Collateralized Mortgage Obligations [Member] | Less than 12 Months [Member]	'	'	'
Schedule Of Securities [Line Items]	'	'	'
Number of held to maturity securities	3	'	'
Non-Agency Collateralized Mortgage Obligations [Member] | Greater than 12 Months [Member]	'	'	'
Schedule Of Securities [Line Items]	'	'	'
Number of held to maturity securities	'	'	'
Commercial Mortgage-Backed Securities [Member]	'	'	'
Schedule Of Securities [Line Items]	'	'	'
Number of held to maturity securities	1	'	'
Securities Held To Maturity, Less than 12 Months, Fair Value	984	'	'
Securities Held To Maturity, Less than 12 Months, Unrealized Losses	-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	984	'	'
Securities Held To Maturity, Unrealized Losses, Total	($37)	'	'
Commercial Mortgage-Backed Securities [Member] | Less than 12 Months [Member]	'	'	'
Schedule Of Securities [Line Items]	'	'	'
Number of held to maturity securities	1	'	'
Commercial Mortgage-Backed Securities [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 $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]	'	'
Beginning balance	$17,367	$18,398
Loss where impairment was not previously recognized	27	212
Additional loss where impairment was previously recognized	'	'
Reduction due to credit impaired securities sold	-212	-1,243
Ending balance	17,182	17,367
Collateralized Debt Obligations [Member]	'	'
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]	'	'
Beginning balance	17,155	18,369
Loss where impairment was not previously recognized	'	'
Additional loss where impairment was previously recognized	'	'
Reduction due to credit impaired securities sold	'	-1,214
Ending balance	17,155	17,155
Residential Non-Agency Collateralized Mortgage Obligations [Member]	'	'
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]	'	'
Beginning balance	212	29
Loss where impairment was not previously recognized	'	212
Additional loss where impairment was previously recognized	'	'
Reduction due to credit impaired securities sold	-212	-29
Ending balance	'	212
Equity securities [Member]	'	'
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]	'	'
Beginning balance	'	'
Loss where impairment was not previously recognized	27	'
Additional loss where impairment was previously recognized	'	'
Reduction due to credit impaired securities sold	'	'
Ending balance	$27	'

Securities_Trust_Preferred_Sec

Securities - Trust Preferred Securities (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013
	Issuer
Schedule Of Securities [Line Items]	'
TPS, Current Par Value	$103,591
TPS, Amortized Cost	44,082
TPS, Fair Value	37,545
TPS, Unrealized Gain (Loss)	-6,537
TPS, Number of Issuers Currently Performing	875
Single Issuer TPS, Fair Value	5,950
Fair Value	31,595
Pooled TPS P1 [Member]	'
Schedule Of Securities [Line Items]	'
Current Par Value	5,500
Amortized Cost	2,611
Fair Value	1,567
Unrealized Gain (Loss)	-1,044
Number of Issuers Currently Performing	42
Actual Defaults (as a percent of original collateral)	22.00%
Actual Deferrals (as a percent of original collateral)	7.00%
Projected Recovery Rates on Current Deferrals	41.00%
Expected Defaults	17.00%
Class	'C1
Lowest Credit Ratings	'C
Excess Subordination (as a percent of current collateral)	0.00%
Pooled TPS P2 [Member]	'
Schedule Of Securities [Line Items]	'
Current Par Value	4,889
Amortized Cost	3,133
Fair Value	1,326
Unrealized Gain (Loss)	-1,807
Number of Issuers Currently Performing	40
Actual Defaults (as a percent of original collateral)	16.00%
Actual Deferrals (as a percent of original collateral)	15.00%
Projected Recovery Rates on Current Deferrals	45.00%
Expected Defaults	14.00%
Class	'C1
Lowest Credit Ratings	'C
Excess Subordination (as a percent of current collateral)	0.00%
Pooled TPS P3 [Member]	'
Schedule Of Securities [Line Items]	'
Current Par Value	5,561
Amortized Cost	4,416
Fair Value	1,691
Unrealized Gain (Loss)	-2,725
Number of Issuers Currently Performing	46
Actual Defaults (as a percent of original collateral)	13.00%
Actual Deferrals (as a percent of original collateral)	9.00%
Projected Recovery Rates on Current Deferrals	34.00%
Expected Defaults	16.00%
Class	'C1
Lowest Credit Ratings	'C
Excess Subordination (as a percent of current collateral)	0.00%
Pooled TPS P4 [Member]	'
Schedule Of Securities [Line Items]	'
Current Par Value	3,994
Amortized Cost	3,169
Fair Value	1,196
Unrealized Gain (Loss)	-1,973
Number of Issuers Currently Performing	51
Actual Defaults (as a percent of original collateral)	16.00%
Actual Deferrals (as a percent of original collateral)	6.00%
Projected Recovery Rates on Current Deferrals	46.00%
Expected Defaults	16.00%
Class	'C1
Lowest Credit Ratings	'C
Excess Subordination (as a percent of current collateral)	0.00%
Pooled TPS P5 [Member]	'
Schedule Of Securities [Line Items]	'
Current Par Value	2,000
Amortized Cost	780
Fair Value	373
Unrealized Gain (Loss)	-407
Number of Issuers Currently Performing	14
Actual Defaults (as a percent of original collateral)	29.00%
Actual Deferrals (as a percent of original collateral)	10.00%
Projected Recovery Rates on Current Deferrals	48.00%
Expected Defaults	11.00%
Class	'B3
Lowest Credit Ratings	'C
Excess Subordination (as a percent of current collateral)	0.00%
Pooled TPS P6 [Member]	'
Schedule Of Securities [Line Items]	'
Current Par Value	3,028
Amortized Cost	2,539
Fair Value	1,016
Unrealized Gain (Loss)	-1,523
Number of Issuers Currently Performing	50
Actual Defaults (as a percent of original collateral)	15.00%
Actual Deferrals (as a percent of original collateral)	18.00%
Projected Recovery Rates on Current Deferrals	50.00%
Expected Defaults	10.00%
Class	'B1
Lowest Credit Ratings	'C
Excess Subordination (as a percent of current collateral)	0.00%
Pooled TPS P7 [Member]	'
Schedule Of Securities [Line Items]	'
Current Par Value	5,048
Amortized Cost	864
Fair Value	1,453
Unrealized Gain (Loss)	589
Number of Issuers Currently Performing	38
Actual Defaults (as a percent of original collateral)	14.00%
Actual Deferrals (as a percent of original collateral)	19.00%
Projected Recovery Rates on Current Deferrals	38.00%
Expected Defaults	13.00%
Class	'C
Lowest Credit Ratings	'C
Excess Subordination (as a percent of current collateral)	0.00%
Pooled TPS P8 [Member]	'
Schedule Of Securities [Line Items]	'
Current Par Value	2,011
Amortized Cost	788
Fair Value	341
Unrealized Gain (Loss)	-447
Number of Issuers Currently Performing	44
Actual Defaults (as a percent of original collateral)	16.00%
Actual Deferrals (as a percent of original collateral)	11.00%
Projected Recovery Rates on Current Deferrals	36.00%
Expected Defaults	17.00%
Class	'C
Lowest Credit Ratings	'C
Excess Subordination (as a percent of current collateral)	0.32%
Pooled TPS P9 [Member]	'
Schedule Of Securities [Line Items]	'
Current Par Value	2,000
Amortized Cost	645
Fair Value	456
Unrealized Gain (Loss)	-189
Number of Issuers Currently Performing	25
Actual Defaults (as a percent of original collateral)	16.00%
Actual Deferrals (as a percent of original collateral)	10.00%
Projected Recovery Rates on Current Deferrals	37.00%
Expected Defaults	11.00%
Class	'A4L
Lowest Credit Ratings	'C
Excess Subordination (as a percent of current collateral)	0.00%
Total OTTI [Member]	'
Schedule Of Securities [Line Items]	'
Current Par Value	34,031
Amortized Cost	18,945
Fair Value	9,419
Unrealized Gain (Loss)	-9,526
Number of Issuers Currently Performing	350
Actual Defaults (as a percent of original collateral)	17.00%
Actual Deferrals (as a percent of original collateral)	11.00%
Projected Recovery Rates on Current Deferrals	42.00%
Expected Defaults	15.00%
Pooled TPS P10 [Member]	'
Schedule Of Securities [Line Items]	'
Current Par Value	5,219
Amortized Cost	1,109
Fair Value	1,487
Unrealized Gain (Loss)	378
Number of Issuers Currently Performing	42
Actual Defaults (as a percent of original collateral)	22.00%
Actual Deferrals (as a percent of original collateral)	7.00%
Projected Recovery Rates on Current Deferrals	41.00%
Expected Defaults	17.00%
Class	'C1
Lowest Credit Ratings	'C
Excess Subordination (as a percent of current collateral)	0.00%
Pooled TPS P11 [Member]	'
Schedule Of Securities [Line Items]	'
Current Par Value	5,000
Amortized Cost	2,240
Fair Value	2,384
Unrealized Gain (Loss)	144
Number of Issuers Currently Performing	40
Actual Defaults (as a percent of original collateral)	16.00%
Actual Deferrals (as a percent of original collateral)	15.00%
Projected Recovery Rates on Current Deferrals	45.00%
Expected Defaults	14.00%
Class	'A2A
Lowest Credit Ratings	'B+
Excess Subordination (as a percent of current collateral)	51.83%
Pooled TPS P12 [Member]	'
Schedule Of Securities [Line Items]	'
Current Par Value	4,781
Amortized Cost	1,371
Fair Value	1,454
Unrealized Gain (Loss)	83
Number of Issuers Currently Performing	46
Actual Defaults (as a percent of original collateral)	13.00%
Actual Deferrals (as a percent of original collateral)	9.00%
Projected Recovery Rates on Current Deferrals	34.00%
Expected Defaults	16.00%
Class	'C1
Lowest Credit Ratings	'C
Excess Subordination (as a percent of current collateral)	0.00%
Pooled TPS P13 [Member]	'
Schedule Of Securities [Line Items]	'
Current Par Value	5,260
Amortized Cost	1,336
Fair Value	1,574
Unrealized Gain (Loss)	238
Number of Issuers Currently Performing	51
Actual Defaults (as a percent of original collateral)	16.00%
Actual Deferrals (as a percent of original collateral)	6.00%
Projected Recovery Rates on Current Deferrals	46.00%
Expected Defaults	16.00%
Class	'C1
Lowest Credit Ratings	'C
Excess Subordination (as a percent of current collateral)	0.00%
Pooled TPS P14 [Member]	'
Schedule Of Securities [Line Items]	'
Current Par Value	5,190
Amortized Cost	1,108
Fair Value	1,357
Unrealized Gain (Loss)	249
Number of Issuers Currently Performing	57
Actual Defaults (as a percent of original collateral)	15.00%
Actual Deferrals (as a percent of original collateral)	12.00%
Projected Recovery Rates on Current Deferrals	28.00%
Expected Defaults	17.00%
Class	'C1
Lowest Credit Ratings	'C
Excess Subordination (as a percent of current collateral)	0.00%
Pooled TPS P15 [Member]	'
Schedule Of Securities [Line Items]	'
Current Par Value	3,206
Amortized Cost	429
Fair Value	616
Unrealized Gain (Loss)	187
Number of Issuers Currently Performing	41
Actual Defaults (as a percent of original collateral)	21.00%
Actual Deferrals (as a percent of original collateral)	6.00%
Projected Recovery Rates on Current Deferrals	23.00%
Expected Defaults	17.00%
Class	'C1
Lowest Credit Ratings	'C
Excess Subordination (as a percent of current collateral)	0.00%
Pooled TPS P16 [Member]	'
Schedule Of Securities [Line Items]	'
Current Par Value	3,339
Amortized Cost	678
Fair Value	775
Unrealized Gain (Loss)	97
Number of Issuers Currently Performing	37
Actual Defaults (as a percent of original collateral)	17.00%
Actual Deferrals (as a percent of original collateral)	9.00%
Projected Recovery Rates on Current Deferrals	31.00%
Expected Defaults	14.00%
Class	'C
Lowest Credit Ratings	'C
Excess Subordination (as a percent of current collateral)	0.00%
Pooled TPS P17 [Member]	'
Schedule Of Securities [Line Items]	'
Current Par Value	2,069
Amortized Cost	694
Fair Value	763
Unrealized Gain (Loss)	69
Number of Issuers Currently Performing	33
Actual Defaults (as a percent of original collateral)	14.00%
Actual Deferrals (as a percent of original collateral)	17.00%
Projected Recovery Rates on Current Deferrals	40.00%
Expected Defaults	14.00%
Class	'B
Lowest Credit Ratings	'Ca
Excess Subordination (as a percent of current collateral)	21.87%
Pooled TPS P18 [Member]	'
Schedule Of Securities [Line Items]	'
Current Par Value	5,000
Amortized Cost	2,243
Fair Value	3,096
Unrealized Gain (Loss)	853
Number of Issuers Currently Performing	19
Actual Defaults (as a percent of original collateral)	0.00%
Actual Deferrals (as a percent of original collateral)	8.00%
Projected Recovery Rates on Current Deferrals	90.00%
Expected Defaults	14.00%
Class	'B2
Lowest Credit Ratings	'CCC
Excess Subordination (as a percent of current collateral)	38.10%
Pooled TPS P19 [Member]	'
Schedule Of Securities [Line Items]	'
Current Par Value	4,080
Amortized Cost	976
Fair Value	1,498
Unrealized Gain (Loss)	522
Number of Issuers Currently Performing	44
Actual Defaults (as a percent of original collateral)	16.00%
Actual Deferrals (as a percent of original collateral)	11.00%
Projected Recovery Rates on Current Deferrals	36.00%
Expected Defaults	17.00%
Class	'B
Lowest Credit Ratings	'C
Excess Subordination (as a percent of current collateral)	15.00%
Pooled TPS P20 [Member]	'
Schedule Of Securities [Line Items]	'
Current Par Value	3,279
Amortized Cost	1,977
Fair Value	2,107
Unrealized Gain (Loss)	103
Number of Issuers Currently Performing	46
Actual Defaults (as a percent of original collateral)	21.00%
Actual Deferrals (as a percent of original collateral)	6.00%
Projected Recovery Rates on Current Deferrals	42.00%
Expected Defaults	15.00%
Class	'A1
Lowest Credit Ratings	'BB-
Excess Subordination (as a percent of current collateral)	55.16%
Pooled TPS P21 [Member]	'
Schedule Of Securities [Line Items]	'
Current Par Value	5,000
Amortized Cost	1,327
Fair Value	1,331
Unrealized Gain (Loss)	4
Number of Issuers Currently Performing	16
Actual Defaults (as a percent of original collateral)	18.00%
Actual Deferrals (as a percent of original collateral)	5.00%
Projected Recovery Rates on Current Deferrals	49.00%
Expected Defaults	11.00%
Class	'B
Lowest Credit Ratings	'C
Excess Subordination (as a percent of current collateral)	0.00%
Pooled TPS P22 [Member]	'
Schedule Of Securities [Line Items]	'
Current Par Value	5,531
Amortized Cost	1,440
Fair Value	1,954
Unrealized Gain (Loss)	514
Number of Issuers Currently Performing	25
Actual Defaults (as a percent of original collateral)	15.00%
Actual Deferrals (as a percent of original collateral)	7.00%
Projected Recovery Rates on Current Deferrals	40.00%
Expected Defaults	10.00%
Class	'C1
Lowest Credit Ratings	'C
Excess Subordination (as a percent of current collateral)	0.00%
Pooled TPS P23 [Member]	'
Schedule Of Securities [Line Items]	'
Current Par Value	5,606
Amortized Cost	1,330
Fair Value	1,780
Unrealized Gain (Loss)	450
Number of Issuers Currently Performing	24
Actual Defaults (as a percent of original collateral)	16.00%
Actual Deferrals (as a percent of original collateral)	8.00%
Projected Recovery Rates on Current Deferrals	42.00%
Expected Defaults	10.00%
Class	'C1
Lowest Credit Ratings	'C
Excess Subordination (as a percent of current collateral)	0.00%
Total Not OTTI [Member]	'
Schedule Of Securities [Line Items]	'
Current Par Value	62,560
Amortized Cost	18,258
Fair Value	22,176
Unrealized Gain (Loss)	3,918
Number of Issuers Currently Performing	521
Actual Defaults (as a percent of original collateral)	16.00%
Actual Deferrals (as a percent of original collateral)	9.00%
Projected Recovery Rates on Current Deferrals	41.00%
Expected Defaults	15.00%
Total Pooled TPS [Member]	'
Schedule Of Securities [Line Items]	'
Current Par Value	96,591
Amortized Cost	37,203
Fair Value	31,595
Unrealized Gain (Loss)	-5,608
Number of Issuers Currently Performing	871
Actual Defaults (as a percent of original collateral)	16.00%
Actual Deferrals (as a percent of original collateral)	10.00%
Projected Recovery Rates on Current Deferrals	41.00%
Expected Defaults	15.00%
Single Issuer TPS S1 [Member]	'
Schedule Of Securities [Line Items]	'
Single Issuer TPS, Current Par Value	2,000
Single Issuer TPS, Amortized Cost	1,955
Single Issuer TPS, Fair Value	1,580
Single Issuer TPS, Unrealized Gain (Loss)	-375
Lowest Credit Ratings	'BB
Single Issuer TPS, Number of Issuers Currently Performing	1
Single Issuer TPS S2 [Member]	'
Schedule Of Securities [Line Items]	'
Single Issuer TPS, Current Par Value	2,000
Single Issuer TPS, Amortized Cost	1,925
Single Issuer TPS, Fair Value	1,630
Single Issuer TPS, Unrealized Gain (Loss)	-295
Lowest Credit Ratings	'BBB
Single Issuer TPS, Number of Issuers Currently Performing	1
Single Issuer TPS S3 [Member]	'
Schedule Of Securities [Line Items]	'
Single Issuer TPS, Current Par Value	2,000
Single Issuer TPS, Amortized Cost	2,000
Single Issuer TPS, Fair Value	1,950
Single Issuer TPS, Unrealized Gain (Loss)	-50
Lowest Credit Ratings	'B+
Single Issuer TPS, Number of Issuers Currently Performing	1
Single Issuer TPS S4 [Member]	'
Schedule Of Securities [Line Items]	'
Single Issuer TPS, Current Par Value	1,000
Single Issuer TPS, Amortized Cost	999
Single Issuer TPS, Fair Value	790
Single Issuer TPS, Unrealized Gain (Loss)	-209
Lowest Credit Ratings	'BB
Single Issuer TPS, Number of Issuers Currently Performing	1
Single Issuer TPS [Member]	'
Schedule Of Securities [Line Items]	'
Single Issuer TPS, Current Par Value	7,000
Single Issuer TPS, Amortized Cost	6,879
Single Issuer TPS, Fair Value	5,950
Single Issuer TPS, Unrealized Gain (Loss)	($929)
Single Issuer TPS, Number of Issuers Currently Performing	4

Securities_Trust_Preferred_Sec1

Securities - Trust Preferred Securities (Parenthetical) (Detail)	Dec. 31, 2013
Minimum [Member]	'
Schedule Of Securities [Line Items]	'
Deferral rate after five years	10.00%
Maximum [Member]	'
Schedule Of Securities [Line Items]	'
Deferral rate after five years	90.00%

Federal_Home_Loan_Bank_Stock_A

Federal Home Loan Bank Stock - Additional Information (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Statement Of Financial Position [Abstract]	'	'
Federal Home Loan Bank stock	$23,636	$24,560

Loans_and_Allowance_for_Loan_L2

Loans and Allowance for Loan Losses - Summary of Loans, Net of Unearned Income (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	$9,506,094	$8,137,719
Commercial Real Estate [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	3,245,209	2,707,046
Commercial and Industrial [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	1,881,474	1,602,314
Commercial Leases [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	158,895	130,133
Total Commercial Loans and Leases [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	5,285,578	4,439,493
Direct Installment [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	1,467,236	1,178,530
Residential Mortgages [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	1,086,739	1,092,228
Indirect Installment [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	655,587	582,037
Consumer Lines of Credit [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	965,771	805,494
Other [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	45,183	39,937
Originated Loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	8,154,765	7,237,391
Originated Loans [Member] | Commercial Real Estate [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	2,640,428	2,448,471
Originated Loans [Member] | Commercial and Industrial [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	1,761,668	1,555,301
Originated Loans [Member] | Commercial Leases [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	158,895	130,133
Originated Loans [Member] | Total Commercial Loans and Leases [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	4,560,991	4,133,905
Originated Loans [Member] | Direct Installment [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	1,387,995	1,108,865
Originated Loans [Member] | Residential Mortgages [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	678,227	653,826
Originated Loans [Member] | Indirect Installment [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	649,701	568,324
Originated Loans [Member] | Consumer Lines of Credit [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	832,668	732,534
Originated Loans [Member] | Other [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	45,183	39,937
Acquired Loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	1,351,329	900,328
Acquired Loans [Member] | Commercial Real Estate [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	604,781	258,575
Acquired Loans [Member] | Commercial and Industrial [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	119,806	47,013
Acquired Loans [Member] | Total Commercial Loans and Leases [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	724,587	305,588
Acquired Loans [Member] | Direct Installment [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	79,241	69,665
Acquired Loans [Member] | Residential Mortgages [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	408,512	438,402
Acquired Loans [Member] | Indirect Installment [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	5,886	13,713
Acquired Loans [Member] | Consumer Lines of Credit [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	$133,103	$72,960

Loans_and_Allowance_for_Loan_L3

Loans and Allowance for Loan Losses - Additional Information (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	$9,506,094	$8,137,719
Outstanding contractual balance receivable of acquired loans	1,449,227	949,862
Commercial construction loans	252,842	190,206
Concentration of loans	0	0
Concentration of loans, percentage	'Excess of 10%	'
Payoffs received on loans in excess of expected cash flows	440	3,539
Threshold period past due for default status of trade accounts receivable	'90 days	'90 days
Minimum corporation reserves for commercial loan	500	'
Minimum amount to allocate specific valuation allowance	500	'
Recorded Investment	3,728	'
Allowance for loan losses	5,900	4,180
Restructured loans returned to performing status	2,952	'
Specific reserves in allowance for loan losses, TDRs	561	41
Pooled reserves in allowance for loan losses, TDRs	193	297
Valuation for impairment of loans with pooled reserves	500	500
Pooled reserves for all other classes of loans	1,005	1,455
Commercial Real Estate [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	3,245,209	2,707,046
Recorded Investment	44,075	49,742
Allowance for loan losses	3,093	1,955
Commercial Real Estate [Member] | FLORIDA [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Commercial real estate loans	39,379	68,627
Percentage of loan portfolio	0.40%	0.80%
Commercial and Industrial [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	1,881,474	1,602,314
Recorded Investment	7,423	7,664
Allowance for loan losses	786	1,140
Direct Installment [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	1,467,236	1,178,530
Recorded Investment	10,577	8,541
Allowance for loan losses	727	657
Residential Mortgages [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	1,086,739	1,092,228
Recorded Investment	14,012	11,414
Allowance for loan losses	970	69
Indirect Installment [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Allowance for loan losses	324	359
Consumer Lines of Credit [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	965,771	805,494
Percentage of loan portfolio	1.90%	2.10%
Consumer loans	179,970	170,999
Recorded Investment	597	746
Commercial Construction Loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Percentage of loan portfolio	2.70%	2.30%
Acquired Loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Loans, net of unearned income	1,345,429	896,148
Purchased Credit-Impaired Loans [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Carrying Amount	21,192	15,864
Outstanding contractual receivable of PCI loan	56,500	41,134
Recorded Investment	$22,192	$16,623
Owner-Occupied [Member] | Commercial Real Estate [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Percentage of loan portfolio	43.10%	46.50%
Non-Owner-Occupied [Member] | Commercial Real Estate [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Percentage of loan portfolio	56.90%	53.50%
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 - Summary of Loans To Related Parties (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013
Receivables [Abstract]	'
Total loans, Beginning Balance	$74,096
New loans	3,210
Repayments	-7,749
Other	-25,334
Total loans, Ending Balance	$44,223

Loans_and_Allowance_for_Loan_L5

Loans and Allowance for Loan Losses - Carrying Amounts at Acquisition of All Purchased Loans (Impaired and Non-Impaired) Acquired (Detail) (Acquired Loans [Member], USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Annapolis Bancorp Inc. And PVF Capital Corp. [Member]	Parkvale Financial Corporation [Member]	Impaired Loans [Member]	Impaired Loans [Member]	Performing Loans [Member]	Performing Loans [Member]
			Annapolis Bancorp Inc. And PVF Capital Corp. [Member]	Parkvale Financial Corporation [Member]	Annapolis Bancorp Inc. And PVF Capital Corp. [Member]	Parkvale Financial Corporation [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	$1,339,566	$40,972	$12,224	$796,114	$1,327,342
Non-accretable difference (expected losses and foregone interest)	-76,199	-220,611	-23,207	-6,070	-52,992	-214,541
Cash flows expected to be collected at acquisition	760,887	1,118,955	17,765	6,154	743,122	1,112,801
Accretable yield	-115,352	-294,183	-2,505	-589	-112,847	-293,594
Basis in acquired loans at acquisition	$645,535	$824,772	$15,260	$5,565	$630,275	$819,207

Loans_and_Allowance_for_Loan_L6

Loans and Allowance for Loan Losses - Summary of Change in Accretable Yield of Acquired Loans (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]	'	'
Balance at beginning of period	$254,153	$51,706
Acquisitions	115,352	294,183
Reduction due to unexpected early payoffs	-42,582	-57,840
Reclass from non-accretable difference	16,393	14,454
Disposals/transfers	-592	-664
Accretion	-37,078	-47,686
Balance at end of period	305,646	254,153
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	778	2,477
Acquisitions	2,505	589
Reclass from non-accretable difference	8,097	3,539
Disposals/transfers	-368	-49
Accretion	-3,556	-5,778
Balance at end of period	7,456	778
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	253,375	49,229
Acquisitions	112,847	293,594
Reduction due to unexpected early payoffs	-42,582	-57,840
Reclass from non-accretable difference	8,296	10,915
Disposals/transfers	-224	-615
Accretion	-33,522	-41,908
Balance at end of period	$298,190	$253,375

Loans_and_Allowance_for_Loan_L7

Loans and Allowance for Loan Losses - Summary of Purchased Credit-Impaired Loans, Information Identified in Corporation's Acquisition of ANNB and PVF (Detail) (USD $)	Dec. 31, 2013	Apr. 06, 2013	Dec. 31, 2013	Oct. 12, 2013
In Thousands, unless otherwise specified	Annapolis Bancorp, Inc. [Member]	Annapolis Bancorp, Inc. [Member]	PVF Capital Corp (PVF) [Member]	PVF Capital Corp (PVF) [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]	'	'	'	'
Outstanding balance	$5,580	$12,220	$29,642	$29,811
Carrying amount	2,308	3,848	11,063	11,412
Allowance for loan losses	'	'	'	'
Impairment recognized since acquisition	31	'	'	'
Allowance reduction recognized since acquisition	'	'	'	'

Loans_and_Allowance_for_Loan_L8

Loans and Allowance for Loan Losses - Summary of Information about Corporation's Purchased Credit-Impaired Loans (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Balance at beginning of period	$254,153	$51,706
Accretion	-37,078	-47,686
Reclass from non-accretable difference	16,393	14,454
Disposals/transfers	592	664
Balance at end of period	305,646	254,153
Recorded Investment [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Balance at beginning of period	16,623	15,839
Acquisitions	15,260	5,565
Accretion	3,556	5,778
Payments received	-9,325	-9,556
Reclass from non-accretable difference	'	'
Disposals/transfers	-3,922	-1,003
Contractual interest	'	'
Balance at end of period	22,192	16,623
Accretable Yield [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Balance at beginning of period	-778	-2,477
Acquisitions	-2,505	-589
Accretion	3,556	5,778
Payments received	'	'
Reclass from non-accretable difference	-8,097	-3,539
Disposals/transfers	368	49
Balance at end of period	-7,456	-778
Expected Cash Flows [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Balance at beginning of period	17,401	18,316
Acquisitions	17,765	6,154
Payments received	-9,325	-9,556
Reclass from non-accretable difference	8,097	3,539
Disposals/transfers	-4,290	-1,052
Balance at end of period	29,648	17,401
Non-Accretable Difference [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Balance at beginning of period	-23,733	-33,377
Acquisitions	-24,266	-2,981
Payments received	1,345	'
Reclass from non-accretable difference	8,097	3,539
Disposals/transfers	14,405	11,442
Contractual interest	-2,700	-2,356
Balance at end of period	-26,852	-23,733
Outstanding Balance [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Balance at beginning of year	41,134	51,693
Acquisitions	42,031	9,135
Payments received	-10,670	-9,556
Disposals/transfers	-18,695	-12,494
Contractual interest	2,700	2,356
Balance at end of period	$56,500	$41,134

Loans_and_Allowance_for_Loan_L9

Loans and Allowance for Loan Losses - Summary of Non-Performing Assets (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Troubled debt restructurings	$41,623	$39,920
Non-Performing [Member]	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'
Non-accrual loans	58,755	66,004
Troubled debt restructurings	18,698	14,876
Total non-performing loans	77,453	80,880
Other real estate owned (OREO)	40,681	35,257
Total non-performing loans and OREO	118,134	116,137
Non-performing investments	797	2,809
Total non-performing assets	$118,931	$118,946
Non-performing loans as a percent of total loans	0.81%	0.99%
Non-performing loans + OREO as a percent of total loans + OREO	1.24%	1.42%
Non-performing assets as a percent of total assets	0.88%	0.99%

Recovered_Sheet1

Loans and Allowance for Loan Losses - Age Analysis of Past Due Loans, by Class (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Total Loans	$9,506,094	$8,137,719
Commercial Real Estate [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Total Loans	3,245,209	2,707,046
Commercial and Industrial [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Total Loans	1,881,474	1,602,314
Commercial Leases [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Total Loans	158,895	130,133
Total Commercial Loans and Leases [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Total Loans	5,285,578	4,439,493
Direct Installment [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Total Loans	1,467,236	1,178,530
Residential Mortgages [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Total Loans	1,086,739	1,092,228
Indirect Installment [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Total Loans	655,587	582,037
Consumer Lines of Credit [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Total Loans	965,771	805,494
Other [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Total Loans	45,183	39,937
Originated Loans [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-89 Days Past Due	37,342	46,205
> 90 Days Past Due and Still Accruing	7,971	6,707
Non- Accrual	58,755	66,004
Total Past Due	104,068	118,916
Current	8,050,697	7,118,475
Total Loans	8,154,765	7,237,391
Originated Loans [Member] | Commercial Real Estate [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-89 Days Past Due	5,428	5,786
> 90 Days Past Due and Still Accruing	252	533
Non- Accrual	40,960	47,895
Total Past Due	46,640	54,214
Current	2,593,788	2,394,257
Total Loans	2,640,428	2,448,471
Originated Loans [Member] | Commercial and Industrial [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-89 Days Past Due	2,066	7,310
> 90 Days Past Due and Still Accruing	8	456
Non- Accrual	6,643	6,017
Total Past Due	8,717	13,783
Current	1,752,951	1,541,518
Total Loans	1,761,668	1,555,301
Originated Loans [Member] | Commercial Leases [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-89 Days Past Due	714	1,671
Non- Accrual	734	965
Total Past Due	1,448	2,636
Current	157,447	127,497
Total Loans	158,895	130,133
Originated Loans [Member] | Total Commercial Loans and Leases [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-89 Days Past Due	8,208	14,767
> 90 Days Past Due and Still Accruing	260	989
Non- Accrual	48,337	54,877
Total Past Due	56,805	70,633
Current	4,504,186	4,063,272
Total Loans	4,560,991	4,133,905
Originated Loans [Member] | Direct Installment [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-89 Days Past Due	9,038	8,834
> 90 Days Past Due and Still Accruing	3,753	2,717
Non- Accrual	4,686	3,342
Total Past Due	17,477	14,893
Current	1,370,518	1,093,972
Total Loans	1,387,995	1,108,865
Originated Loans [Member] | Residential Mortgages [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-89 Days Past Due	12,681	15,821
> 90 Days Past Due and Still Accruing	2,401	2,365
Non- Accrual	4,260	2,891
Total Past Due	19,342	21,077
Current	658,885	632,749
Total Loans	678,227	653,826
Originated Loans [Member] | Indirect Installment [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-89 Days Past Due	5,653	5,114
> 90 Days Past Due and Still Accruing	471	374
Non- Accrual	1,060	1,039
Total Past Due	7,184	6,527
Current	642,517	561,797
Total Loans	649,701	568,324
Originated Loans [Member] | Consumer Lines of Credit [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-89 Days Past Due	1,737	1,633
> 90 Days Past Due and Still Accruing	1,076	247
Non- Accrual	412	355
Total Past Due	3,225	2,235
Current	829,443	730,299
Total Loans	832,668	732,534
Originated Loans [Member] | Other [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-89 Days Past Due	25	36
> 90 Days Past Due and Still Accruing	10	15
Non- Accrual	'	3,500
Total Past Due	35	3,551
Current	45,148	36,386
Total Loans	45,183	39,937
Acquired Loans [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-89 Days Past Due	30,205	22,799
> 90 Days Past Due and Still Accruing	45,823	36,585
Total Past Due	76,028	59,384
Current	1,373,199	890,478
Discount	-97,898	-49,534
Total Loans	1,351,329	900,328
Acquired Loans [Member] | Commercial Real Estate [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-89 Days Past Due	13,637	6,829
> 90 Days Past Due and Still Accruing	20,668	13,597
Total Past Due	34,305	20,426
Current	619,197	250,116
Discount	-48,721	-11,967
Total Loans	604,781	258,575
Acquired Loans [Member] | Commercial and Industrial [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-89 Days Past Due	1,860	1,653
> 90 Days Past Due and Still Accruing	1,899	138
Total Past Due	3,759	1,791
Current	124,415	47,351
Discount	-8,368	-2,129
Total Loans	119,806	47,013
Acquired Loans [Member] | Total Commercial Loans and Leases [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-89 Days Past Due	15,497	8,482
> 90 Days Past Due and Still Accruing	22,567	13,735
Total Past Due	38,064	22,217
Current	743,612	297,467
Discount	-57,089	-14,096
Total Loans	724,587	305,588
Acquired Loans [Member] | Direct Installment [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-89 Days Past Due	1,447	1,454
> 90 Days Past Due and Still Accruing	1,178	947
Total Past Due	2,625	2,401
Current	74,917	63,502
Discount	1,699	3,762
Total Loans	79,241	69,665
Acquired Loans [Member] | Residential Mortgages [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-89 Days Past Due	11,464	12,137
> 90 Days Past Due and Still Accruing	19,298	21,069
Total Past Due	30,762	33,206
Current	412,704	439,620
Discount	-34,954	-34,424
Total Loans	408,512	438,402
Acquired Loans [Member] | Indirect Installment [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-89 Days Past Due	205	347
> 90 Days Past Due and Still Accruing	31	56
Total Past Due	236	403
Current	6,267	14,089
Discount	-617	-779
Total Loans	5,886	13,713
Acquired Loans [Member] | Consumer Lines of Credit [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
30-89 Days Past Due	1,592	379
> 90 Days Past Due and Still Accruing	2,749	778
Total Past Due	4,341	1,157
Current	135,699	75,800
Discount	-6,937	-3,997
Total Loans	$133,103	$72,960

Recovered_Sheet2

Loans and Allowance for Loan Losses - Summary of Commercial Loans by Credit Quality (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Originated Loans [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	$4,560,991	$4,133,905
Originated Loans [Member] | Commercial Real Estate [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	2,640,428	2,448,471
Originated Loans [Member] | Commercial and Industrial [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	1,761,668	1,555,301
Originated Loans [Member] | Commercial Leases [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	158,895	130,133
Acquired Loans [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	724,587	305,588
Acquired Loans [Member] | Commercial Real Estate [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	604,781	258,575
Acquired Loans [Member] | Commercial and Industrial [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	119,806	47,013
Acquired Loans [Member] | Commercial Leases [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	'	'
Pass [Member] | Originated Loans [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	4,244,509	3,881,020
Pass [Member] | Originated Loans [Member] | Commercial Real Estate [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	2,476,988	2,282,139
Pass [Member] | Originated Loans [Member] | Commercial and Industrial [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	1,611,530	1,472,598
Pass [Member] | Originated Loans [Member] | Commercial Leases [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	155,991	126,283
Pass [Member] | Acquired Loans [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	543,347	243,896
Pass [Member] | Acquired Loans [Member] | Commercial Real Estate [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	442,604	204,300
Pass [Member] | Acquired Loans [Member] | Commercial and Industrial [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	100,743	39,596
Pass [Member] | Acquired Loans [Member] | Commercial Leases [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	'	'
Special Mention [Member] | Originated Loans [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	155,760	90,408
Special Mention [Member] | Originated Loans [Member] | Commercial Real Estate [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	56,140	57,938
Special Mention [Member] | Originated Loans [Member] | Commercial and Industrial [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	97,675	32,227
Special Mention [Member] | Originated Loans [Member] | Commercial Leases [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	1,945	243
Special Mention [Member] | Acquired Loans [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	80,497	18,324
Special Mention [Member] | Acquired Loans [Member] | Commercial Real Estate [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	74,315	14,713
Special Mention [Member] | Acquired Loans [Member] | Commercial and Industrial [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	6,182	3,611
Special Mention [Member] | Acquired Loans [Member] | Commercial Leases [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	'	'
Substandard [Member] | Originated Loans [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	159,880	159,679
Substandard [Member] | Originated Loans [Member] | Commercial Real Estate [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	106,599	106,258
Substandard [Member] | Originated Loans [Member] | Commercial and Industrial [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	52,322	49,814
Substandard [Member] | Originated Loans [Member] | Commercial Leases [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	959	3,607
Substandard [Member] | Acquired Loans [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	97,952	42,897
Substandard [Member] | Acquired Loans [Member] | Commercial Real Estate [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	85,086	39,093
Substandard [Member] | Acquired Loans [Member] | Commercial and Industrial [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	12,866	3,804
Substandard [Member] | Acquired Loans [Member] | Commercial Leases [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	'	'
Doubtful [Member] | Originated Loans [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	842	2,798
Doubtful [Member] | Originated Loans [Member] | Commercial Real Estate [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	701	2,136
Doubtful [Member] | Originated Loans [Member] | Commercial and Industrial [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	141	662
Doubtful [Member] | Acquired Loans [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	2,791	471
Doubtful [Member] | Acquired Loans [Member] | Commercial Real Estate [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	2,776	469
Doubtful [Member] | Acquired Loans [Member] | Commercial and Industrial [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	15	2
Doubtful [Member] | Acquired Loans [Member] | Commercial Leases [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total commercial loans and leases	'	'

Recovered_Sheet3

Loans and Allowance for Loan Losses - Summary of Consumer Loans by Payment Status (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Credit Quality [Line Items]	'	'
Loans, net of unearned income	$9,506,094	$8,137,719
Non-Performing [Member]	'	'
Credit Quality [Line Items]	'	'
Non-Performing Loans	77,453	80,880
Direct Installment [Member]	'	'
Credit Quality [Line Items]	'	'
Loans, net of unearned income	1,467,236	1,178,530
Direct Installment [Member] | Performing [Member]	'	'
Credit Quality [Line Items]	'	'
Performing Loans	1,377,418	1,100,324
Direct Installment [Member] | Non-Performing [Member]	'	'
Credit Quality [Line Items]	'	'
Non-Performing Loans	10,577	8,541
Residential Mortgages [Member]	'	'
Credit Quality [Line Items]	'	'
Loans, net of unearned income	1,086,739	1,092,228
Residential Mortgages [Member] | Performing [Member]	'	'
Credit Quality [Line Items]	'	'
Performing Loans	664,214	642,406
Residential Mortgages [Member] | Non-Performing [Member]	'	'
Credit Quality [Line Items]	'	'
Non-Performing Loans	14,013	11,420
Indirect Installment [Member]	'	'
Credit Quality [Line Items]	'	'
Loans, net of unearned income	655,587	582,037
Indirect Installment [Member] | Performing [Member]	'	'
Credit Quality [Line Items]	'	'
Performing Loans	648,499	567,192
Indirect Installment [Member] | Non-Performing [Member]	'	'
Credit Quality [Line Items]	'	'
Non-Performing Loans	1,202	1,132
Consumer Lines of Credit [Member] | Performing [Member]	'	'
Credit Quality [Line Items]	'	'
Performing Loans	832,071	731,788
Consumer Lines of Credit [Member] | Non-Performing [Member]	'	'
Credit Quality [Line Items]	'	'
Non-Performing Loans	597	746
Other [Member]	'	'
Credit Quality [Line Items]	'	'
Loans, net of unearned income	45,183	39,937
Other [Member] | Performing [Member]	'	'
Credit Quality [Line Items]	'	'
Performing Loans	45,183	36,437
Other [Member] | Non-Performing [Member]	'	'
Credit Quality [Line Items]	'	'
Non-Performing Loans	'	3,500
Originated Loans [Member]	'	'
Credit Quality [Line Items]	'	'
Loans, net of unearned income	8,154,765	7,237,391
Originated Loans [Member] | Direct Installment [Member]	'	'
Credit Quality [Line Items]	'	'
Loans, net of unearned income	1,387,995	1,108,865
Originated Loans [Member] | Residential Mortgages [Member]	'	'
Credit Quality [Line Items]	'	'
Loans, net of unearned income	678,227	653,826
Originated Loans [Member] | Indirect Installment [Member]	'	'
Credit Quality [Line Items]	'	'
Loans, net of unearned income	649,701	568,324
Originated Loans [Member] | Consumer Lines of Credit [Member]	'	'
Credit Quality [Line Items]	'	'
Loans, net of unearned income	832,668	732,534
Originated Loans [Member] | Other [Member]	'	'
Credit Quality [Line Items]	'	'
Loans, net of unearned income	$45,183	$39,937

Recovered_Sheet4

Loans and Allowance for Loan Losses - Summary of Impaired Loans, by Class (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Financial Receivables Impaired Or Restructured [Line Items]	'	'
Recorded Investment	$3,728	'
Related Allowance	825	'
Commercial Real Estate [Member]	'	'
Financial Receivables Impaired Or Restructured [Line Items]	'	'
With no allowance recorded, Recorded Investment	40,472	37,119
With no allowance recorded, Unpaid Principal Balance	62,034	50,234
With no allowance recorded, Related Allowance	'	'
With no allowance recorded, Average Recorded Investment	37,376	36,426
With allowance recorded, Recorded Investment	3,603	12,623
With allowance recorded, Unpaid Principal Balance	3,818	21,877
With allowance recorded, Specific Related Allowance	701	2,136
With allowance recorded, Average Recorded Investment	14,379	14,522
Recorded Investment	44,075	49,742
Unpaid Principal Balance	65,852	72,111
Related Allowance	701	2,136
Average Recorded Investment	51,755	50,948
Commercial and Industrial [Member]	'	'
Financial Receivables Impaired Or Restructured [Line Items]	'	'
With no allowance recorded, Recorded Investment	7,301	7,074
With no allowance recorded, Unpaid Principal Balance	8,669	9,597
With no allowance recorded, Average Recorded Investment	8,304	6,992
With allowance recorded, Recorded Investment	122	590
With allowance recorded, Unpaid Principal Balance	130	590
With allowance recorded, Specific Related Allowance	123	590
With allowance recorded, Average Recorded Investment	126	592
Recorded Investment	7,423	7,664
Unpaid Principal Balance	8,799	10,187
Related Allowance	123	590
Average Recorded Investment	8,430	7,584
Commercial Leases [Member]	'	'
Financial Receivables Impaired Or Restructured [Line Items]	'	'
With no allowance recorded, Recorded Investment	734	965
With no allowance recorded, Unpaid Principal Balance	734	'
With no allowance recorded, Average Recorded Investment	758	1,053
Recorded Investment	734	965
Unpaid Principal Balance	734	'
Average Recorded Investment	758	1,053
Total Commercial Loans and Leases [Member]	'	'
Financial Receivables Impaired Or Restructured [Line Items]	'	'
With no allowance recorded, Recorded Investment	48,507	45,158
With no allowance recorded, Unpaid Principal Balance	71,437	59,831
With no allowance recorded, Average Recorded Investment	46,438	44,471
With allowance recorded, Recorded Investment	3,725	13,213
With allowance recorded, Unpaid Principal Balance	3,948	22,467
With allowance recorded, Specific Related Allowance	824	2,726
With allowance recorded, Average Recorded Investment	14,505	15,114
Recorded Investment	52,232	58,371
Unpaid Principal Balance	75,385	82,298
Related Allowance	824	2,726
Average Recorded Investment	60,943	59,585
Direct Installment [Member]	'	'
Financial Receivables Impaired Or Restructured [Line Items]	'	'
With no allowance recorded, Recorded Investment	10,577	8,541
With no allowance recorded, Unpaid Principal Balance	10,830	8,693
With no allowance recorded, Average Recorded Investment	10,557	6,443
Recorded Investment	10,577	8,541
Unpaid Principal Balance	10,830	8,693
Average Recorded Investment	10,557	6,443
Residential Mortgages [Member]	'	'
Financial Receivables Impaired Or Restructured [Line Items]	'	'
With no allowance recorded, Recorded Investment	14,012	11,414
With no allowance recorded, Unpaid Principal Balance	14,560	11,223
With no allowance recorded, Average Recorded Investment	13,565	9,059
Recorded Investment	14,012	11,414
Unpaid Principal Balance	14,560	11,223
Average Recorded Investment	13,565	9,059
Indirect Installment [Member]	'	'
Financial Receivables Impaired Or Restructured [Line Items]	'	'
With no allowance recorded, Recorded Investment	1,202	1,132
With no allowance recorded, Unpaid Principal Balance	2,633	2,381
With no allowance recorded, Average Recorded Investment	1,127	1,133
Recorded Investment	1,202	1,132
Unpaid Principal Balance	2,633	2,381
Average Recorded Investment	1,127	1,133
Consumer Lines of Credit [Member]	'	'
Financial Receivables Impaired Or Restructured [Line Items]	'	'
With no allowance recorded, Recorded Investment	597	746
With no allowance recorded, Unpaid Principal Balance	668	792
With no allowance recorded, Average Recorded Investment	573	591
Recorded Investment	597	746
Unpaid Principal Balance	668	792
Average Recorded Investment	573	591
Other [Member]	'	'
Financial Receivables Impaired Or Restructured [Line Items]	'	'
With no allowance recorded, Recorded Investment	'	3,500
With no allowance recorded, Unpaid Principal Balance	'	3,500
With no allowance recorded, Average Recorded Investment	'	3,500
Recorded Investment	'	3,500
Unpaid Principal Balance	'	3,500
Average Recorded Investment	'	$3,500

Recovered_Sheet5

Loans and Allowance for Loan Losses - Summary of Composition of Total TDRs (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Financing Receivable, Modifications [Line Items]	'	'
Troubled debt restructurings ("TDRs")	$41,623	$39,920
Performing [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Troubled debt restructurings ("TDRs")	10,220	12,659
Non-Performing [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Troubled debt restructurings ("TDRs")	18,698	14,876
Non-Accrual [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Troubled debt restructurings ("TDRs")	$12,705	$12,385

Recovered_Sheet6

Loans and Allowance for Loan Losses - Summary of Troubled Debt Restructurings by Class of Loans (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
	Contract	Contract
Financing Receivable, Modifications [Line Items]	'	'
Number of Contracts	520	498
Pre-Modification Outstanding Recorded Investment	$11,366	$10,947
Post-Modification Outstanding Recorded Investment	10,175	11,805
Commercial Real Estate [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of Contracts	10	21
Pre-Modification Outstanding Recorded Investment	4,439	4,067
Post-Modification Outstanding Recorded Investment	3,588	4,505
Commercial and Industrial [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of Contracts	'	8
Pre-Modification Outstanding Recorded Investment	'	389
Post-Modification Outstanding Recorded Investment	'	257
Total Commercial Loans and Leases [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of Contracts	10	29
Pre-Modification Outstanding Recorded Investment	4,439	4,456
Post-Modification Outstanding Recorded Investment	3,588	4,762
Direct Installment [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of Contracts	409	362
Pre-Modification Outstanding Recorded Investment	4,198	3,876
Post-Modification Outstanding Recorded Investment	3,971	3,763
Residential Mortgages [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of Contracts	54	56
Pre-Modification Outstanding Recorded Investment	2,464	2,232
Post-Modification Outstanding Recorded Investment	2,366	2,814
Indirect Installment [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of Contracts	28	31
Pre-Modification Outstanding Recorded Investment	117	169
Post-Modification Outstanding Recorded Investment	107	151
Consumer Lines of Credit [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Number of Contracts	19	20
Pre-Modification Outstanding Recorded Investment	148	214
Post-Modification Outstanding Recorded Investment	$143	$315

Recovered_Sheet7

Loans and Allowance for Loan Losses - Summary of Troubled Debt Restructurings by Class of Loans, Payment Default (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
	Contract		Contract
Financing Receivable, Modifications [Line Items]	'		'
Number of Contracts	92		46
Recorded Investment	$1,553	[1]	$483	[1]
Commercial Real Estate [Member]	'		'
Financing Receivable, Modifications [Line Items]	'		'
Number of Contracts	1		'
Recorded Investment	737	[1]	'
Commercial and Industrial [Member]	'		'
Financing Receivable, Modifications [Line Items]	'		'
Number of Contracts	1		'
Recorded Investment	12	[1]	'
Total Commercial Loans and Leases [Member]	'		'
Financing Receivable, Modifications [Line Items]	'		'
Number of Contracts	2		'
Recorded Investment	749	[1]	'
Direct Installment [Member]	'		'
Financing Receivable, Modifications [Line Items]	'		'
Number of Contracts	76		38
Recorded Investment	380	[1]	249	[1]
Residential Mortgages [Member]	'		'
Financing Receivable, Modifications [Line Items]	'		'
Number of Contracts	7		5
Recorded Investment	303	[1]	229	[1]
Indirect Installment [Member]	'		'
Financing Receivable, Modifications [Line Items]	'		'
Number of Contracts	6		3
Recorded Investment	36	[1]	5	[1]
Consumer Lines of Credit [Member]	'		'
Financing Receivable, Modifications [Line Items]	'		'
Number of Contracts	1		'
Recorded Investment	$85	[1]	'
[1]	The recorded investment is as of period end.

Recovered_Sheet8

Loans and Allowance for Loan Losses - Summary of Changes in Allowance for Loan Losses by Class (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule Of Allowance For Loan Losses [Line Items]	'	'	'
Balance at Beginning of Year	$104,374	$100,662	$106,120
Charge- Offs	-30,530	-32,576	-41,831
Recoveries	5,850	4,986	2,732
Net Charge- Offs	-24,680	-27,590	-39,099
Provision for loan losses	31,090	31,302	33,641
Balance at End of Year	110,784	104,374	100,662
Originated Loans [Member]	'	'	'
Schedule Of Allowance For Loan Losses [Line Items]	'	'	'
Balance at Beginning of Year	100,194	100,662	106,120
Charge- Offs	-27,701	-32,322	-41,623
Recoveries	6,226	4,671	2,725
Net Charge- Offs	-21,475	-27,651	-38,898
Provision for loan losses	26,165	27,183	33,440
Balance at End of Year	104,884	100,194	100,662
Acquired Loans [Member]	'	'	'
Schedule Of Allowance For Loan Losses [Line Items]	'	'	'
Balance at Beginning of Year	4,180	'	'
Charge- Offs	-2,829	-254	-208
Recoveries	-376	315	7
Net Charge- Offs	-3,205	61	-201
Provision for loan losses	4,925	4,119	201
Balance at End of Year	5,900	4,180	'
Commercial Real Estate [Member]	'	'	'
Schedule Of Allowance For Loan Losses [Line Items]	'	'	'
Balance at Beginning of Year	34,810	43,283	49,924
Charge- Offs	-5,465	-8,688	-21,018
Recoveries	1,799	1,765	594
Net Charge- Offs	-3,666	-6,923	-20,424
Provision for loan losses	1,404	-1,550	13,783
Balance at End of Year	32,548	34,810	43,283
Commercial and Industrial [Member]	'	'	'
Schedule Of Allowance For Loan Losses [Line Items]	'	'	'
Balance at Beginning of Year	31,849	25,476	24,682
Charge- Offs	-5,124	-8,098	-3,642
Recoveries	2,108	693	368
Net Charge- Offs	-3,016	-7,405	-3,274
Provision for loan losses	3,770	13,778	4,068
Balance at End of Year	32,603	31,849	25,476
Commercial Leases [Member]	'	'	'
Schedule Of Allowance For Loan Losses [Line Items]	'	'	'
Balance at Beginning of Year	1,744	1,556	1,070
Charge- Offs	-432	-509	-567
Recoveries	179	224	75
Net Charge- Offs	-253	-285	-492
Provision for loan losses	412	473	978
Balance at End of Year	1,903	1,744	1,556
Total Commercial Loans and Leases [Member]	'	'	'
Schedule Of Allowance For Loan Losses [Line Items]	'	'	'
Balance at Beginning of Year	68,403	70,315	75,676
Charge- Offs	-11,021	-17,295	-25,227
Recoveries	4,086	2,682	1,037
Net Charge- Offs	-6,935	-14,613	-24,190
Provision for loan losses	5,586	12,701	18,829
Balance at End of Year	67,054	68,403	70,315
Direct Installment [Member]	'	'	'
Schedule Of Allowance For Loan Losses [Line Items]	'	'	'
Balance at Beginning of Year	15,130	14,814	14,941
Charge- Offs	-9,059	-7,875	-8,874
Recoveries	931	942	876
Net Charge- Offs	-8,128	-6,933	-7,998
Provision for loan losses	10,822	7,249	7,871
Balance at End of Year	17,824	15,130	14,814
Residential Mortgages [Member]	'	'	'
Schedule Of Allowance For Loan Losses [Line Items]	'	'	'
Balance at Beginning of Year	5,155	4,437	4,578
Charge- Offs	-1,345	-1,050	-1,261
Recoveries	162	194	67
Net Charge- Offs	-1,183	-856	-1,194
Provision for loan losses	1,864	1,574	1,053
Balance at End of Year	5,836	5,155	4,437
Indirect Installment [Member]	'	'	'
Schedule Of Allowance For Loan Losses [Line Items]	'	'	'
Balance at Beginning of Year	5,449	5,503	5,941
Charge- Offs	-3,337	-2,926	-2,957
Recoveries	773	605	501
Net Charge- Offs	-2,564	-2,321	-2,456
Provision for loan losses	3,524	2,267	2,018
Balance at End of Year	6,409	5,449	5,503
Consumer Lines of Credit [Member]	'	'	'
Schedule Of Allowance For Loan Losses [Line Items]	'	'	'
Balance at Beginning of Year	6,057	5,447	4,743
Charge- Offs	-1,974	-2,137	-2,110
Recoveries	274	234	213
Net Charge- Offs	-1,700	-1,903	-1,897
Provision for loan losses	2,874	2,513	2,601
Balance at End of Year	7,231	6,057	5,447
Other [Member]	'	'	'
Schedule Of Allowance For Loan Losses [Line Items]	'	'	'
Balance at Beginning of Year	'	146	241
Charge- Offs	-965	-1,039	-1,194
Recoveries	'	14	31
Net Charge- Offs	-965	-1,025	-1,163
Provision for loan losses	1,495	879	1,068
Balance at End of Year	530	'	146
Purchased Credit-Impaired Loans [Member]	'	'	'
Schedule Of Allowance For Loan Losses [Line Items]	'	'	'
Balance at Beginning of Year	759	'	'
Charge- Offs	-299	'	-208
Recoveries	'	'	7
Net Charge- Offs	-299	'	-201
Provision for loan losses	540	759	201
Balance at End of Year	1,000	759	'
Other Acquired Loans [Member]	'	'	'
Schedule Of Allowance For Loan Losses [Line Items]	'	'	'
Balance at Beginning of Year	3,421	'	'
Charge- Offs	-2,530	-254	'
Recoveries	-376	315	'
Net Charge- Offs	-2,906	61	'
Provision for loan losses	4,385	3,360	'
Balance at End of Year	$4,900	$3,421	'

Recovered_Sheet9

Loans and Allowance for Loan Losses - Summary of Individual and Collective Allowance for Loan Losses and Loan Balances by Class (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Valuation Allowance [Line Items]	'	'
Allowance, Individually Evaluated for Impairment	$824	$2,726
Allowance, Collectively Evaluated for Impairment	104,060	97,468
Loans	9,506,094	8,137,719
Loans Outstanding, Individually Evaluated for Impairment	34,376	36,648
Loans Outstanding, Collectively Evaluated for Impairment	8,120,389	7,200,743
Commercial Real Estate [Member]	'	'
Valuation Allowance [Line Items]	'	'
Allowance, Individually Evaluated for Impairment	701	2,136
Allowance, Collectively Evaluated for Impairment	31,847	32,674
Loans	3,245,209	2,707,046
Loans Outstanding, Individually Evaluated for Impairment	30,133	35,024
Loans Outstanding, Collectively Evaluated for Impairment	2,610,295	2,413,447
Commercial and Industrial [Member]	'	'
Valuation Allowance [Line Items]	'	'
Allowance, Individually Evaluated for Impairment	123	590
Allowance, Collectively Evaluated for Impairment	32,480	31,259
Loans	1,881,474	1,602,314
Loans Outstanding, Individually Evaluated for Impairment	4,243	1,624
Loans Outstanding, Collectively Evaluated for Impairment	1,757,425	1,553,677
Commercial Leases [Member]	'	'
Valuation Allowance [Line Items]	'	'
Allowance, Collectively Evaluated for Impairment	1,903	1,744
Loans	158,895	130,133
Loans Outstanding, Collectively Evaluated for Impairment	158,895	130,133
Total Commercial Loans and Leases [Member]	'	'
Valuation Allowance [Line Items]	'	'
Allowance, Individually Evaluated for Impairment	824	2,726
Allowance, Collectively Evaluated for Impairment	66,230	65,677
Loans	5,285,578	4,439,493
Loans Outstanding, Individually Evaluated for Impairment	34,376	36,648
Loans Outstanding, Collectively Evaluated for Impairment	4,526,615	4,097,257
Direct Installment [Member]	'	'
Valuation Allowance [Line Items]	'	'
Allowance, Collectively Evaluated for Impairment	17,824	15,130
Loans	1,467,236	1,178,530
Loans Outstanding, Collectively Evaluated for Impairment	1,387,995	1,108,865
Residential Mortgages [Member]	'	'
Valuation Allowance [Line Items]	'	'
Allowance, Collectively Evaluated for Impairment	5,836	5,155
Loans	1,086,739	1,092,228
Loans Outstanding, Collectively Evaluated for Impairment	678,227	653,826
Indirect Installment [Member]	'	'
Valuation Allowance [Line Items]	'	'
Allowance, Collectively Evaluated for Impairment	6,409	5,449
Loans	655,587	582,037
Loans Outstanding, Collectively Evaluated for Impairment	649,701	568,324
Consumer Lines of Credit [Member]	'	'
Valuation Allowance [Line Items]	'	'
Allowance, Collectively Evaluated for Impairment	7,231	6,057
Loans	965,771	805,494
Loans Outstanding, Collectively Evaluated for Impairment	832,668	732,534
Other [Member]	'	'
Valuation Allowance [Line Items]	'	'
Allowance, Collectively Evaluated for Impairment	530	'
Loans	45,183	39,937
Loans Outstanding, Collectively Evaluated for Impairment	45,183	39,937
Originated Loans [Member]	'	'
Valuation Allowance [Line Items]	'	'
Loans	8,154,765	7,237,391
Originated Loans [Member] | Commercial Real Estate [Member]	'	'
Valuation Allowance [Line Items]	'	'
Loans	2,640,428	2,448,471
Originated Loans [Member] | Commercial and Industrial [Member]	'	'
Valuation Allowance [Line Items]	'	'
Loans	1,761,668	1,555,301
Originated Loans [Member] | Commercial Leases [Member]	'	'
Valuation Allowance [Line Items]	'	'
Loans	158,895	130,133
Originated Loans [Member] | Total Commercial Loans and Leases [Member]	'	'
Valuation Allowance [Line Items]	'	'
Loans	4,560,991	4,133,905
Originated Loans [Member] | Direct Installment [Member]	'	'
Valuation Allowance [Line Items]	'	'
Loans	1,387,995	1,108,865
Originated Loans [Member] | Residential Mortgages [Member]	'	'
Valuation Allowance [Line Items]	'	'
Loans	678,227	653,826
Originated Loans [Member] | Indirect Installment [Member]	'	'
Valuation Allowance [Line Items]	'	'
Loans	649,701	568,324
Originated Loans [Member] | Consumer Lines of Credit [Member]	'	'
Valuation Allowance [Line Items]	'	'
Loans	832,668	732,534
Originated Loans [Member] | Other [Member]	'	'
Valuation Allowance [Line Items]	'	'
Loans	$45,183	$39,937

Premises_and_Equipment_Summary

Premises and Equipment - Summary of Premises and Equipment (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Property Plant And Equipment Useful Life And Values [Abstract]	'	'
Land	$34,234	$31,196
Premises	135,633	128,259
Equipment	117,228	101,144
Property Plant and Equipment Gross	287,095	260,599
Accumulated depreciation	-133,063	-120,232
Property Plant and Equipment Net	$154,032	$140,367

Premises_and_Equipment_Additio

Premises and Equipment - Additional Information (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Property Plant And Equipment Useful Life And Values [Abstract]	'	'	'
Depreciation expense	$15,558	$13,937	$12,457
Operating leases, expiration date	'2045	'	'
Rental expense	10,443	8,784	6,960
Minimum rental commitments	$66,055	'	'

Premises_and_Equipment_Summary1

Premises and Equipment - Summary of Future Minimum Lease Payments (Detail) (USD $)	Dec. 31, 2013
In Thousands, unless otherwise specified
Property Plant And Equipment Useful Life And Values [Abstract]	'
2014	$9,994
2015	8,769
2016	7,743
2017	7,131
2018	5,545
Later years	$26,873

Goodwill_and_Other_Intangible_2

Goodwill and Other Intangible Assets - Rollforward of Goodwill (Detail) (USD $)

12 Months Ended

In Thousands, unless otherwise specified

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Community Banking [Member]

Community Banking [Member]

Wealth Management [Member]

Wealth Management [Member]

Wealth Management [Member]

Insurance [Member]

Insurance [Member]

Insurance [Member]

Consumer Finance [Member]

Consumer Finance [Member]

Consumer Finance [Member]

Goodwill [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

Goodwill, Beginning Balance

$675,555

$568,462

$656,776

$549,683

$8,020

$8,020

$8,020

$8,950

$8,950

$8,950

$1,809

$1,809

$1,809

Goodwill additions

88,693

107,093

88,693

107,093

'

'

'

'

'

'

'

'

'

Goodwill, Ending Balance

$764,248

$675,555

$745,469

$656,776

$8,020

$8,020

$8,020

$8,950

$8,950

$8,950

$1,809

$1,809

$1,809

Goodwill_and_Other_Intangible_3

Goodwill and Other Intangible Assets - Summary of Core Deposit Intangibles, Customer and Renewal Lists And Other Intangible Assets (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Finite-Lived Intangible Assets [Line Items]	'	'
Gross carrying amount	$119,048	$99,885
Accumulated amortization	-71,440	-62,034
Core deposit intangibles, Total	47,608	37,851
Core Deposit Intangibles [Member]	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Gross carrying amount	97,698	87,056
Accumulated amortization	-62,793	-55,095
Core deposit intangibles, Total	34,905	31,961
Customer And Renewal Lists [Member]	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Gross carrying amount	10,970	10,970
Accumulated amortization	-6,407	-5,698
Core deposit intangibles, Total	4,563	5,272
Other Intangible Assets [Member]	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Gross carrying amount	10,380	1,859
Accumulated amortization	-2,240	-1,241
Core deposit intangibles, Total	$8,140	$618

Goodwill_and_Other_Intangible_4

Goodwill and Other Intangible Assets - Additional Information (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]	'	'	'
Amortization of intangibles	$8,407	$8,924	$7,040
Minimum [Member]	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'
Amortization period of intangible assets, years	'10 years	'	'
Maximum [Member]	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'
Amortization period of intangible assets, years	'12 years	'	'
Core Deposit Intangibles [Member]	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'
Amortization period of intangible assets, years	'10 years	'	'
Customer And Renewal Lists [Member] | Minimum [Member]	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'
Amortization period of intangible assets, years	'8 years	'	'
Customer And Renewal Lists [Member] | Maximum [Member]	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'
Amortization period of intangible assets, years	'12 years	'	'
Other Intangible Assets [Member] | Minimum [Member]	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'
Amortization period of intangible assets, years	'8 years	'	'
Other Intangible Assets [Member] | Maximum [Member]	'	'	'
Finite-Lived Intangible Assets [Line Items]	'	'	'
Amortization period of intangible assets, years	'12 years	'	'

Goodwill_and_Other_Intangible_5

Goodwill and Other Intangible Assets - Schedule of Expected Amortization Expense on Finite-Lived Intangible Assets (Detail) (USD $)	Dec. 31, 2013
In Thousands, unless otherwise specified
Goodwill And Intangible Assets Disclosure [Abstract]	'
2014	$8,615
2015	6,590
2016	5,580
2017	4,855
2018	$3,379

Deposits_Summary_of_Deposits_D

Deposits - Summary of Deposits (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Deposits [Abstract]	'	'
Non-interest bearing demand	$2,200,081	$1,738,195
Savings and NOW	5,392,078	4,808,121
Certificates and other time deposits	2,606,073	2,535,858
Total Deposits	$10,198,232	$9,082,174

Deposits_Additional_Informatio

Deposits - Additional Information (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Deposits [Abstract]	'	'
Total, time deposits of $100,000 or more	$857,470	$795,113

Deposits_Time_Deposits_by_Rema

Deposits - Time Deposits by Remaining Maturity (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Time Deposits [Line Items]	'	'
Three months or less	$127,595	'
Three to six months	130,171	'
Six to twelve months	216,124	'
Over twelve months	383,580	'
Total, time deposits of $100,000 or more	857,470	795,113
Certificates of Deposit [Member]	'	'
Time Deposits [Line Items]	'	'
Three months or less	117,298	'
Three to six months	121,512	'
Six to twelve months	190,656	'
Over twelve months	258,989	'
Total, time deposits of $100,000 or more	688,455	'
Other Time Deposits [Member]	'	'
Time Deposits [Line Items]	'	'
Three months or less	10,297	'
Three to six months	8,659	'
Six to twelve months	25,468	'
Over twelve months	124,591	'
Total, time deposits of $100,000 or more	$169,015	'

Deposits_Summary_of_Scheduled_

Deposits - Summary of Scheduled Maturities of Certificates and Other Time Deposits (Detail) (USD $)	Dec. 31, 2013
In Thousands, unless otherwise specified
Time Deposits Noncurrent By Maturity [Abstract]	'
2014	$1,499,828
2015	485,809
2016	279,663
2017	211,214
2018	93,915
Later years	$35,644

ShortTerm_Borrowings_Summary_o

Short-Term Borrowings - Summary of Short-Term Borrowings (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Debt Disclosure [Abstract]	'	'
Securities sold under repurchase agreements	$841,741	$807,820
Federal funds purchased	270,000	140,000
Subordinated notes	129,498	135,318
Short-term borrowings	$1,241,239	$1,083,138

ShortTerm_Borrowings_Additiona

Short-Term Borrowings - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Debt Disclosure [Abstract]	'	'	'
Weighted average interest rates on short-term borrowings during year	0.43%	0.53%	0.84%
Weighted average interest rates on short-term borrowings at period end	0.41%	0.47%	0.71%

LongTerm_Debt_Summary_of_LongT

Long-Term Debt - Summary of Long-Term Debt (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Debt Disclosure [Abstract]	'	'
Federal Home Loan Bank advances	$50,076	$88
Subordinated notes	84,637	79,897
Other subordinated debt	8,637	8,850
Convertible subordinated notes	578	590
Long-term debt	$143,928	$89,425

LongTerm_Debt_Additional_Infor

Long-Term Debt - Additional Information (Detail) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Debt Disclosure [Line Items]	'	'	'
Credit available with FHLB	$3,349,926	'	'
Credit with FHLB used	50,076	88	'
Federal Home Loan Bank advances are scheduled to mature periodically through the year	'2019	'	'
Effective interest rates, minimum	1.06%	3.78%	'
Effective interest rates, maximum	4.19%	4.19%	'
Weighted average interest rate on long-term subordinated debt	2.77%	3.18%	3.85%
Notice required of holders prior to redemption	'30 days	'	'
Assumed other subordinated notes in conjunction with an acquisition	8,000	'	'
Amortizing adjustment over the life of the notes	$1,275	'	'
Subordinated notes, fixed-rate	8.00%	'	'
Percentage, redemption price must equal plus principal	100.00%	'	'
Assumed interest rate on convertible subordinated notes	5.00%	'	'
Conversion price per share	$12.50	'	'
Common stock reserved for issuance in convertible subordinated notes	46,200	'	'
Minimum [Member]	'	'	'
Debt Disclosure [Line Items]	'	'	'
Months prior to maturity, interest discount	'3 months	'	'
Maximum [Member]	'	'	'
Debt Disclosure [Line Items]	'	'	'
Months prior to maturity, interest discount	'12 months	'	'
Other Subordinated Notes [Member]	'	'	'
Debt Disclosure [Line Items]	'	'	'
Subordinated notes maturity (year)	'2016	'	'
Convertible Subordinated Notes [Member]	'	'	'
Debt Disclosure [Line Items]	'	'	'
Subordinated notes maturity (year)	'2018	'	'

LongTerm_Debt_Scheduled_Annual

Long-Term Debt - Scheduled Annual Maturities of Long-Term Debt (Detail) (USD $)	Dec. 31, 2013
In Thousands, unless otherwise specified
Debt Disclosure [Abstract]	'
2014	$28,546
2015	23,023
2016	75,409
2017	10,445
2018	3,077
Later years	$3,428

Junior_Subordinated_Debt_Addit

Junior Subordinated Debt - Additional Information (Detail) (USD $)	1 Months Ended	3 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2013
		Trust		Trust
Debt Disclosure [Abstract]	'	'	'	'
Number of unconsolidated subsidiary trusts	'	3	'	3
Percent of the common equity of each Trust owned by the Corporation	'	100.00%	'	100.00%
Increased total assets	'	$15,000,000	'	$15,000,000
Amount of TPS repurchased	15,000	'	15,000	15,000
Redeemed value of TPS	'	-115,000	'	-134,021
Debt extinguishment of TPS	'	$130,000	'	'

Junior_Subordinated_Debt_Junio

Junior Subordinated Debt - Junior Subordinated Debt Trusts (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013
In Thousands, unless otherwise specified			F.N.B. Statutory Trust II [Member]	Omega Financial Capital Trust I [Member]	Sun Bancorp Statutory Trust I [Member]
Subordinated Borrowing [Line Items]	'	'	'	'	'
Trust Preferred Securities	$74,000	'	$21,500	$36,000	$16,500
Common Securities	2,290	'	665	1,114	511
Junior subordinated debt	$75,205	$204,019	$22,165	$36,029	$17,011
Stated Maturity Date	'	'	15-Jun-36	18-Oct-34	22-Feb-31
Interest Rate	'	'	1.89%	2.44%	10.20%
Description of variable rate	'	'	'Variable;LIBOR + 165 basis points (bps)	'Variable;LIBOR + 219 bps	'Fixed
Basis points	'	'	1.65%	2.19%	'

Derivative_Instruments_Additio

Derivative Instruments - Additional Information (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Agreement
Derivative [Line Items]	'	'
Number of separate interest rate derivative agreements	4	'
Notional amount of swaps	$828,576	'
Fair value of derivatives, in a net liability position	38,239	59,341
Collateral with derivative counterparties, fair value	37,427	60,062
Cash collateral posted	1,976	'
Additional amount in excess of posted collateral required in case of breached agreements	2,224	2,428
Swap [Member] | Short [Member]	'	'
Derivative [Line Items]	'	'
Number of swaps	312	'
Swap [Member] | Long [Member]	'	'
Derivative [Line Items]	'	'
Number of swaps	278	'
Notional amount of swaps	$1,028,576	'

Derivative_Instruments_Offsett

Derivative Instruments - Offsetting of Derivative Assets and Liabilities (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Derivatives, Fair Value [Line Items]	'	'
Gross Amount	$33,317	$58,008
Gross Amounts Offset in the Balance Sheet, Derivative Assets	'	'
Net Amount Presented in the Balance Sheet	33,317	58,008
Gross Amount	43,369	58,150
Gross Amounts Offset in the Balance Sheet, Derivative Liabilities	'	'
Net Amount Presented in the Balance Sheet	43,369	58,150
Derivative Assets Subject to Master Netting Arrangement [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Net Amount Presented in the Balance Sheet	3,579	'
Derivative Assets Subject to Master Netting Arrangement [Member] | Interest Rate Contracts [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Gross Amount	3,547	'
Gross Amounts Offset in the Balance Sheet, Derivative Assets	'	'
Net Amount Presented in the Balance Sheet	3,547	'
Derivative Assets Subject to Master Netting Arrangement [Member] | Equity Contracts [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Gross Amount	32	16
Gross Amounts Offset in the Balance Sheet, Derivative Assets	'	'
Net Amount Presented in the Balance Sheet	32	16
Derivative Assets Not Subject to Master Netting Arrangement [Member] | Interest Rate Contracts [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Gross Amount	29,738	57,992
Gross Amounts Offset in the Balance Sheet, Derivative Assets	'	'
Net Amount Presented in the Balance Sheet	29,738	57,992
Derivative Liabilities Subject to Master Netting Arrangement [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Net Amount Presented in the Balance Sheet	40,323	58,134
Derivative Liabilities Subject to Master Netting Arrangement [Member] | Interest Rate Contracts [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Gross Amount	40,323	58,134
Gross Amounts Offset in the Balance Sheet, Derivative Liabilities	'	'
Net Amount Presented in the Balance Sheet	40,323	58,134
Derivative Liabilities Not Subject to Master Netting Arrangement [Member] | Interest Rate Contracts [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Gross Amount	3,014	'
Gross Amounts Offset in the Balance Sheet, Derivative Liabilities	'	'
Net Amount Presented in the Balance Sheet	3,014	'
Derivative Liabilities Not Subject to Master Netting Arrangement [Member] | Equity Contracts [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Gross Amount	32	16
Gross Amounts Offset in the Balance Sheet, Derivative Liabilities	'	'
Net Amount Presented in the Balance Sheet	$32	$16

Derivative_Instruments_Derivat

Derivative Instruments - Derivative Assets (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Derivative [Line Items]	'	'
Net Amount Presented in the Balance Sheet	$33,317	$58,008
Gross Amounts Not Offset in the Balance Sheet Cash Collateral Received, Derivative Assets	53	'
Net Amount, Derivative Assets	82	'
Derivative Assets Subject to Master Netting Arrangement [Member]	'	'
Derivative [Line Items]	'	'
Net Amount Presented in the Balance Sheet	3,579	'
Gross Amounts Not Offset in the Balance Sheet Financial Instruments, Derivative Assets	3,444	'
Counterparty B [Member]	'	'
Derivative [Line Items]	'	'
Gross Amounts Not Offset in the Balance Sheet Cash Collateral Received, Derivative Assets	'	'
Net Amount, Derivative Assets	'	'
Counterparty B [Member] | Derivative Assets Subject to Master Netting Arrangement [Member]	'	'
Derivative [Line Items]	'	'
Net Amount Presented in the Balance Sheet	24	'
Gross Amounts Not Offset in the Balance Sheet Financial Instruments, Derivative Assets	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	566	'
Gross Amounts Not Offset in the Balance Sheet Financial Instruments, Derivative Assets	566	'
Counterparty E [Member]	'	'
Derivative [Line Items]	'	'
Gross Amounts Not Offset in the Balance Sheet Cash Collateral Received, Derivative Assets	'	'
Net Amount, Derivative Assets	'	16
Counterparty E [Member] | Derivative Assets Subject to Master Netting Arrangement [Member]	'	'
Derivative [Line Items]	'	'
Net Amount Presented in the Balance Sheet	1,696	16
Gross Amounts Not Offset in the Balance Sheet Financial Instruments, Derivative Assets	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	355	'
Gross Amounts Not Offset in the Balance Sheet Financial Instruments, Derivative Assets	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	251	'
Gross Amounts Not Offset in the Balance Sheet Financial Instruments, Derivative Assets	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	634	'
Gross Amounts Not Offset in the Balance Sheet Financial Instruments, Derivative Assets	634	'
Counterparty J [Member]	'	'
Derivative [Line Items]	'	'
Gross Amounts Not Offset in the Balance Sheet Cash Collateral Received, Derivative Assets	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	53	'
Gross Amounts Not Offset in the Balance Sheet Financial Instruments, Derivative Assets	'	'

Derivative_Instruments_Derivat1

Derivative Instruments - Derivative Liabilities (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Derivative [Line Items]	'	'
Net Amount Presented in the Balance Sheet	$43,369	$58,150
Derivative Liabilities Subject to Master Netting Arrangement [Member]	'	'
Derivative [Line Items]	'	'
Net Amount Presented in the Balance Sheet	40,323	58,134
Gross Amount Not Offset in the Balance Sheet Financial Instruments, Derivative Liabilities	36,581	55,901
Gross Amount Not Offset in the Balance Sheet Cash Collateral Pledged, Derivative Liabilities	1,610	'
Net Amount, Derivative Liabilities	2,132	2,233
Derivative Liabilities Subject to Master Netting Arrangement [Member] | Counterparty A [Member]	'	'
Derivative [Line Items]	'	'
Net Amount Presented in the Balance Sheet	4,934	8,393
Gross Amount Not Offset in the Balance Sheet Financial Instruments, Derivative Liabilities	4,934	8,393
Gross Amount Not Offset in the Balance Sheet Cash Collateral Pledged, Derivative Liabilities	'	'
Net Amount, Derivative Liabilities	'	'
Derivative Liabilities Subject to Master Netting Arrangement [Member] | Counterparty B [Member]	'	'
Derivative [Line Items]	'	'
Net Amount Presented in the Balance Sheet	3,249	5,601
Gross Amount Not Offset in the Balance Sheet Financial Instruments, Derivative Liabilities	3,249	5,601
Gross Amount Not Offset in the Balance Sheet Cash Collateral Pledged, Derivative Liabilities	'	'
Net Amount, Derivative Liabilities	'	'
Derivative Liabilities Subject to Master Netting Arrangement [Member] | Counterparty C [Member]	'	'
Derivative [Line Items]	'	'
Net Amount Presented in the Balance Sheet	1,431	2,145
Gross Amount Not Offset in the Balance Sheet Financial Instruments, Derivative Liabilities	1,431	2,145
Gross Amount Not Offset in the Balance Sheet Cash Collateral Pledged, Derivative Liabilities	'	'
Net Amount, Derivative Liabilities	'	'
Derivative Liabilities Subject to Master Netting Arrangement [Member] | Counterparty D [Member]	'	'
Derivative [Line Items]	'	'
Net Amount Presented in the Balance Sheet	9,614	12,354
Gross Amount Not Offset in the Balance Sheet Financial Instruments, Derivative Liabilities	9,614	12,354
Gross Amount Not Offset in the Balance Sheet Cash Collateral Pledged, Derivative Liabilities	'	'
Net Amount, Derivative Liabilities	'	'
Derivative Liabilities Subject to Master Netting Arrangement [Member] | Counterparty E [Member]	'	'
Derivative [Line Items]	'	'
Net Amount Presented in the Balance Sheet	6,257	8,846
Gross Amount Not Offset in the Balance Sheet Financial Instruments, Derivative Liabilities	6,257	8,846
Gross Amount Not Offset in the Balance Sheet Cash Collateral Pledged, Derivative Liabilities	'	'
Net Amount, Derivative Liabilities	'	'
Derivative Liabilities Subject to Master Netting Arrangement [Member] | Counterparty F [Member]	'	'
Derivative [Line Items]	'	'
Net Amount Presented in the Balance Sheet	13	353
Gross Amount Not Offset in the Balance Sheet Financial Instruments, Derivative Liabilities	13	282
Gross Amount Not Offset in the Balance Sheet Cash Collateral Pledged, Derivative Liabilities	'	'
Net Amount, Derivative Liabilities	'	71
Derivative Liabilities Subject to Master Netting Arrangement [Member] | Counterparty G [Member]	'	'
Derivative [Line Items]	'	'
Net Amount Presented in the Balance Sheet	5,309	5,497
Gross Amount Not Offset in the Balance Sheet Financial Instruments, Derivative Liabilities	5,309	5,497
Gross Amount Not Offset in the Balance Sheet Cash Collateral Pledged, Derivative Liabilities	'	'
Net Amount, Derivative Liabilities	'	'
Derivative Liabilities Subject to Master Netting Arrangement [Member] | Counterparty H [Member]	'	'
Derivative [Line Items]	'	'
Net Amount Presented in the Balance Sheet	2,257	3,937
Gross Amount Not Offset in the Balance Sheet Financial Instruments, Derivative Liabilities	125	1,775
Gross Amount Not Offset in the Balance Sheet Cash Collateral Pledged, Derivative Liabilities	'	'
Net Amount, Derivative Liabilities	2,132	2,162
Derivative Liabilities Subject to Master Netting Arrangement [Member] | Counterparty I [Member]	'	'
Derivative [Line Items]	'	'
Net Amount Presented in the Balance Sheet	5,649	11,008
Gross Amount Not Offset in the Balance Sheet Financial Instruments, Derivative Liabilities	5,649	11,008
Gross Amount Not Offset in the Balance Sheet Cash Collateral Pledged, Derivative Liabilities	'	'
Net Amount, Derivative Liabilities	'	'
Derivative Liabilities Subject to Master Netting Arrangement [Member] | Counterparty J [Member]	'	'
Derivative [Line Items]	'	'
Net Amount Presented in the Balance Sheet	1,610	'
Gross Amount Not Offset in the Balance Sheet Financial Instruments, Derivative Liabilities	'	'
Gross Amount Not Offset in the Balance Sheet Cash Collateral Pledged, Derivative Liabilities	1,610	'
Net Amount, Derivative Liabilities	'	'

Derivative_Instruments_Effect_

Derivative Instruments - Effect of Corporation's Derivative Financial Instruments on Income Statement (Detail) (Interest Rate Contracts [Member], Other Income [Member], USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Interest Rate Contracts [Member] | Other Income [Member]	'	'	'
Derivative [Line Items]	'	'	'
Interest Rate Products	($39)	$167	($635)

Commitments_Credit_Risk_and_Co2

Commitments, Credit Risk and Contingencies - Summary of Off-Balance Sheet Credit Risk Information (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
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	$2,897,748	$2,600,355
Standby Letters of Credit [Member]	'	'
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]	'	'
Extended credit and standby letters of credit	$114,298	$130,912

Commitments_Credit_Risk_and_Co3

Commitments, Credit Risk and Contingencies - Additional Information (Detail)	Dec. 31, 2013
Commitments And Contingencies Disclosure [Abstract]	'
Percentage of Commitments to extend credit dependent upon the financial condition of the customers	81.30%

Stock_Incentive_Plans_Addition

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

12 Months Ended

12 Months Ended

In Thousands, except Share data, unless otherwise specified

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Jun. 16, 2009

Dec. 31, 2013

Jan. 02, 2012

Dec. 31, 2013

Apr. 06, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Apr. 06, 2013

Dec. 31, 2013

Parkvale Financial Corporation [Member]

Parkvale Financial Corporation [Member]

Annapolis Bancorp, Inc. [Member]

Annapolis Bancorp, Inc. [Member]

Restricted Stock [Member]

Restricted Stock [Member]

Restricted Stock [Member]

Employee Stock Option [Member]

Employee Stock Option [Member]

Employee Stock Option [Member]

Service-Based Awards [Member]

Performance-Based Awards [Member]

Discretionary Service-Based Awards [Member]

Warrant Expires In 2019 [Member]

Warrant Expires In 2019 [Member]

Warrant Expires in 2018 [Member]

Annapolis Bancorp, Inc. [Member]

Parkvale Financial Corporation [Member]

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

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Restricted stock awards issued

361,664

321,295

407,980

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Aggregate, weighted average grant date fair value

$4,016

$3,884

$4,110

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Common stock shares available under Incentive Compensation Plans

2,716,902

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Vesting period of awards expensed, years

'

'

'

'

'

'

'

'

'

'

'

'10 years

'

'

'3 years

'4 years

'5 years

'

'

'

Share-based compensation expense related to restricted stock awards

'

'

'

'

'

'

'

'

$5,063

$3,758

$4,396

'

'

'

'

'

'

'

'

'

Tax benefit related to restricted stock awards

'

'

'

'

'

'

'

'

1,772

1,315

1,538

'

'

'

'

'

'

'

'

'

Total fair value of awards vested

'

'

'

'

'

'

'

'

8,259

2,193

1,767

'

'

'

'

'

'

'

'

'

Unrecognized compensation cost related to unvested restricted stock awards

4,891

'

'

'

'

'

'

'

4,891

'

'

'

'

'

1,671

3,220

'

'

'

'

Amount subject to accelerated vesting under Incentive Compensation Plan

'

'

'

'

'

'

'

'

71

'

'

'

'

'

'

'

'

'

'

'

Stock options exercised

69,429

182,188

8,389

'

'

'

'

'

'

'

'

69,429

182,188

8,389

'

'

'

'

'

'

Stock options granted

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Intrinsic value of outstanding and exercisable stock options

$559

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Maximum common shares available for purchase under warrants

1,302,083

'

'

651,042

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Warrant issued, exercise price

'

'

'

'

'

5.81

'

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 $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'	'	'
Awards, Unvested shares outstanding at beginning of year	1,913,073	1,846,115	1,309,489
Awards, Granted	361,664	321,295	407,980
Awards, Net adjustment due to performance	165,545	28,181	229,516
Awards, Vested	-734,129	-179,767	-172,029
Awards, Forfeited	-37,828	-179,132	-1,749
Awards, Dividend reinvestment	60,708	76,381	72,908
Awards, Unvested shares outstanding at end of year	1,729,033	1,913,073	1,846,115
Weighted Average Grant Price per Share, Unvested shares outstanding at beginning of year	$9.17	$8.44	$8.52
Weighted Average Grant Price per Share, Granted	$11.10	$12.09	$10.07
Weighted Average Grant Price per Share, Net adjustment due to performance	$9.60	$8.31	$8.40
Weighted Average Grant Price per Share, Vested	$7.90	$8.24	$13.57
Weighted Average Grant Price per Share, Forfeited	$10.42	$8.50	$10.09
Weighted Average Grant Price per Share, Dividend reinvestment	$11.82	$11.19	$10.01
Weighted Average Grant Price per Share, Unvested shares outstanding at end of year	$10.23	$9.17	$8.44

Stock_Incentive_Plans_Componen

Stock Incentive Plans - Components of Restricted Stock Awards (Detail) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Jan. 02, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Unvested shares	1,729,033	1,913,073	1,846,115	1,309,489
Unrecognized compensation expense	$4,891	'	'	'
Intrinsic value	21,821	'	'	'
Weighted average remaining life (in years)	'2 years 2 months 12 days	'	'	'
Service-Based Awards [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Unvested shares	446,239	'	'	'
Unrecognized compensation expense	1,671	'	'	'
Intrinsic value	5,632	'	'	'
Weighted average remaining life (in years)	'2 years 1 month 28 days	'	'	'
Performance-Based Awards [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Unvested shares	1,282,794	'	'	'
Unrecognized compensation expense	3,220	'	'	'
Intrinsic value	$16,189	'	'	'
Weighted average remaining life (in years)	'2 years 2 months 19 days	'	'	'

Stock_Incentive_Plans_Summary_1

Stock Incentive Plans - Summary of Information Concerning Stock Option Awards (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'	'	'
Weighted Average Price per Share, Options outstanding at beginning of year	$13.21	$14.93	$14.28
Weighted Average Price per Share, Assumed from acquisition	$11.16	$10.41	'
Weighted Average Price per Share, Exercised	$7.46	$8.87	$2.68
Weighted Average Price per Share, Forfeited	$15.58	$13.32	$12.67
Weighted Average Price per Share, Options outstanding and exercisable at end of year	$11.51	$13.21	$14.93
Shares, Options outstanding at beginning of year	640,050	586,020	770,610
Shares, Assumed from acquisition	274,964	627,808	'
Shares, Exercised	-69,429	-182,188	-8,389
Shares, Forfeited	-312,061	-391,590	-176,201
Shares, Options outstanding and exercisable at end of year	533,524	640,050	586,020

Stock_Incentive_Plans_Summary_2

Stock Incentive Plans - Summary of Stock Options Outstanding (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Options Outstanding and Exercisable	533,524
$3.45 - $5.18 [Member]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Options Outstanding and Exercisable	57,517
Range of Exercise Prices, Minimum	$3.45
Range of Exercise Prices, Maximum	$5.18
Weighted Average Exercise Price	$4.32
Weighted Average Remaining Contractual Years	'5 years 3 months 29 days
$5.19 - $7.78 [Member]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Options Outstanding and Exercisable	159,503
Range of Exercise Prices, Minimum	$5.19
Range of Exercise Prices, Maximum	$7.78
Weighted Average Exercise Price	$6.14
Weighted Average Remaining Contractual Years	'5 years 2 months 16 days
$7.79 - $11.68 [Member]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Range of Exercise Prices, Minimum	$7.79
Range of Exercise Prices, Maximum	$11.68
Weighted Average Remaining Contractual Years	'0 years
$11.69 - $17.54 [Member]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Options Outstanding and Exercisable	259,927
Range of Exercise Prices, Minimum	$11.69
Range of Exercise Prices, Maximum	$17.54
Weighted Average Exercise Price	$12.67
Weighted Average Remaining Contractual Years	'3 years 1 month 10 days
$17.55 - $26.32 [Member]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Options Outstanding and Exercisable	16,375
Range of Exercise Prices, Minimum	$17.55
Range of Exercise Prices, Maximum	$26.32
Weighted Average Exercise Price	$18.51
Weighted Average Remaining Contractual Years	'0 years
$26.33 - $36.42 [Member]	'
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]	'
Options Outstanding and Exercisable	40,202
Range of Exercise Prices, Minimum	$26.33
Range of Exercise Prices, Maximum	$36.42
Weighted Average Exercise Price	$32.81
Weighted Average Remaining Contractual Years	'9 months 15 days

Stock_Incentive_Plans_Summary_3

Stock Incentive Plans - Summary of Stock Options Exercised (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'	'	'
Proceeds from stock options exercised	$365	$864	$22
Tax benefit recognized from stock options exercised	79	96	22
Intrinsic value of stock options exercised	$318	$435	$63

Retirement_Plans_Additional_In

Retirement Plans - Additional Information (Detail) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2008
	RetirementPlans
Retirement Plans [Line Items]	'	'	'	'
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%	'	'	'
Benefits paid	$6,534	$7,139	'	'
Employer contributions to the qualified pension plans	15,000	5,000	'	'
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	9,300	8,860	8,445	'
Common stock, value	1,592	1,398	'	'
Dividends received on common stock	264	264	'	'
Equity securities [Member]	'	'	'	'
Retirement Plans [Line Items]	'	'	'	'
Common stock, shares	550,128	550,128	'	'
Common stock, value	6,943	5,842	'	'
Percentage of common stock on total plan assets	5.00%	5.20%	'	'
Qualified Pension Plans [Member]	'	'	'	'
Retirement Plans [Line Items]	'	'	'	'
Benefits paid	5,212	5,813	'	'
Non-Qualified Pension Plans [Member]	'	'	'	'
Retirement Plans [Line Items]	'	'	'	'
Benefits paid	$1,322	$1,326	'	'
Maximum [Member]	'	'	'	'
Retirement Plans [Line Items]	'	'	'	'
Percentage Of Non Callable Corporate Bonds	10.00%	10.00%	'	'
Minimum [Member]	'	'	'	'
Retirement Plans [Line Items]	'	'	'	'
Percentage Of Non Callable Corporate Bonds	10.00%	10.00%	'	'

Retirement_Plans_Schedule_of_A

Retirement Plans - Schedule of Accumulated Benefit Obligation, Change in Benefit Obligation, Change in Plan Assets, Plans' Funded Status and Amount Included in Consolidated Balance Sheet (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Compensation And Retirement Disclosure [Abstract]	'	'	'
Accumulated benefit obligation	$139,483	$153,606	'
Projected benefit obligation at beginning of year	153,958	143,307	'
Service cost	65	59	58
Interest cost	5,728	6,173	6,746
Actuarial (gain) loss	-13,486	11,558	'
Benefits paid	-6,534	-7,139	'
Projected benefit obligation at end of year	139,731	153,958	143,307
Fair value of plan assets at beginning of year	113,416	105,330	'
Actual return on plan assets	16,534	8,899	'
Corporation contribution	16,321	6,326	'
Benefits paid	-6,534	-7,139	'
Fair value of plan assets at end of year	139,737	113,416	105,330
Funded status of plans	$6	($40,542)	'

Retirement_Plans_Schedule_of_A1

Retirement Plans - Schedule of Actuarial Assumptions Used in Determination of Projected Benefit Obligation (Detail)	Dec. 31, 2013	Dec. 31, 2012
Schedule Of Sale Of Subsidiary [Abstract]	'	'
Weighted average discount rate	4.68%	3.78%
Rates of average increase in compensation levels	4.00%	4.00%

Retirement_Plans_Schedule_of_N

Retirement Plans -Schedule of Net Periodic Pension Cost and Other Comprehensive Income (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Compensation And Retirement Disclosure [Abstract]	'	'	'
Service cost	$65	$59	$58
Interest cost	5,728	6,173	6,746
Expected return on plan assets	-9,081	-7,935	-7,647
Transition amount amortization	-93	-93	-93
Prior service credit amortization	7	7	7
Actuarial loss amortization	2,263	1,861	1,131
Net periodic pension cost (gain)	-1,111	72	202
Current year actuarial (gain) loss	-20,938	10,594	19,097
Amortization of actuarial loss	-2,263	-1,861	-1,131
Amortization of prior service credit	-7	-7	-7
Amortization of transition asset	93	93	93
Total recognized in other comprehensive income	-23,115	8,819	18,052
Total recognized in net periodic pension cost (gain) and other comprehensive income	($24,226)	$8,891	$18,254

Retirement_Plans_Schedule_of_A2

Retirement Plans - Schedule of Actuarial Assumptions Used in Determination of Net Periodic Pension Cost (Detail)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Compensation And Retirement Disclosure [Abstract]	'	'	'
Weighted average discount rate	3.78%	4.39%	5.28%
Rates of increase in compensation levels	4.00%	4.00%	4.00%
Expected long-term rate of return on assets	7.25%	7.50%	7.50%

Retirement_Plans_Schedule_of_P

Retirement Plans - Schedule of Projected Benefit Obligation, Accumulated Benefit Obligation and Fair Value of Plan Assets for Qualified and Non-Qualified Pension Plans (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Projected benefit obligation	$139,731	$153,958	$143,307
Accumulated benefit obligation	139,483	153,606	'
Fair value of plan assets	139,737	113,416	105,330
Qualified Pension Plans [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Projected benefit obligation	120,512	133,116	'
Accumulated benefit obligation	120,512	133,116	'
Fair value of plan assets	139,737	113,416	'
Non-Qualified Pension Plans [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Projected benefit obligation	19,219	20,842	'
Accumulated benefit obligation	18,971	20,490	'
Fair value of plan assets	'	'	'

Retirement_Plans_Schedule_of_I

Retirement Plans - Schedule of Impact of Changes in Discount Rate, Return on Plan Assets and Compensation Levels on Pension Expense (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013
Compensation And Retirement Disclosure [Abstract]	'
0.5% decrease in the discount rate, Estimated Increase in Pension Expense	($35)
0.5% decrease in the expected long-term rate of return on plan assets, Estimated Increase in Pension Expense	$626

Retirement_Plans_Schedule_of_E

Retirement Plans - Schedule of Estimated Future Cash Flows (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013
Compensation And Retirement Disclosure [Abstract]	'
Expected employer contributions: 2014	$1,322
Expected benefit payments: 2014	6,510
Expected benefit payments: 2015	6,862
Expected benefit payments: 2016	7,246
Expected benefit payments: 2017	9,127
Expected benefit payments: 2018	8,113
Expected benefit payments: 2019-2023	$44,995

Retirement_Plans_Schedule_of_A3

Retirement Plans - Schedule of Asset Allocations for Pension Plans (Detail)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Equity securities [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Target Allocation Range, Minimum	45.00%	'
Target Allocation Range, Maximum	65.00%	'
Percentage of Plan Assets	57.00%	57.00%
Debt securities [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Target Allocation Range, Minimum	30.00%	'
Target Allocation Range, Maximum	50.00%	'
Percentage of Plan Assets	40.00%	40.00%
Cash equivalents [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Target Allocation Range, Minimum	0.00%	'
Target Allocation Range, Maximum	10.00%	'
Percentage of Plan Assets	3.00%	3.00%

Retirement_Plans_Schedule_of_F

Retirement Plans - Schedule of Fair Value of Pension Plan Assets by Asset Category (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	$139,737	$113,416	$105,330
Cash equivalents [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	4,090	3,587	'
F.N.B. Corporation [Member] | Equity securities [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	6,943	5,842	'
Other Large-Cap U.S. Financial Services Companies [Member] | Equity securities [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	2,354	1,563	'
Other Large-Cap U.S. Companies [Member] | Equity securities [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	34,345	27,709	'
International Companies [Member] | Equity securities [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	555	624	'
Non-U.S. Equities Growth Fund [Member] | Mutual Fund Equity Investments [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	10,783	8,972	'
Other [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	4,469	4,280	'
U.S. Government Agencies [Member] | Fixed Income Securities [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	44,653	36,030	'
U.S. Investment-Grade Fixed Income Securities [Member] | Fixed Income Mutual Funds [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	10,196	8,404	'
Non-U.S. Fixed Income Securities [Member] | Fixed Income Mutual Funds [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	473	503	'
U.S. Large-Cap Equity Index Funds [Member] | U.S. Equity Index Funds [Member] | Mutual Fund Equity Investments [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	2,543	2,129	'
U.S. Small-Cap Equity Index Funds [Member] | U.S. Equity Index Funds [Member] | Mutual Fund Equity Investments [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	2,850	2,096	'
U.S. Mid-Cap Equity Index Funds [Member] | U.S. Equity Index Funds [Member] | Mutual Fund Equity Investments [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	3,911	2,928	'
U.S. Mid-Cap [Member] | U.S. Equity Funds [Member] | Mutual Fund Equity Investments [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	7,919	5,893	'
U.S. Small-Cap [Member] | U.S. Equity Funds [Member] | Mutual Fund Equity Investments [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	3,653	2,856	'
Level 1 [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	95,084	77,386	'
Level 1 [Member] | Cash equivalents [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	4,090	3,587	'
Level 1 [Member] | F.N.B. Corporation [Member] | Equity securities [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	6,943	5,842	'
Level 1 [Member] | Other Large-Cap U.S. Financial Services Companies [Member] | Equity securities [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	2,354	1,563	'
Level 1 [Member] | Other Large-Cap U.S. Companies [Member] | Equity securities [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	34,345	27,709	'
Level 1 [Member] | International Companies [Member] | Equity securities [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	555	624	'
Level 1 [Member] | Non-U.S. Equities Growth Fund [Member] | Mutual Fund Equity Investments [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	10,783	8,972	'
Level 1 [Member] | Other [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	4,469	4,280	'
Level 1 [Member] | U.S. Government Agencies [Member] | Fixed Income Securities [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	'	'	'
Level 1 [Member] | U.S. Investment-Grade Fixed Income Securities [Member] | Fixed Income Mutual Funds [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	10,196	8,404	'
Level 1 [Member] | Non-U.S. Fixed Income Securities [Member] | Fixed Income Mutual Funds [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	473	503	'
Level 1 [Member] | U.S. Large-Cap Equity Index Funds [Member] | U.S. Equity Index Funds [Member] | Mutual Fund Equity Investments [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	2,543	2,129	'
Level 1 [Member] | U.S. Small-Cap Equity Index Funds [Member] | U.S. Equity Index Funds [Member] | Mutual Fund Equity Investments [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	2,850	2,096	'
Level 1 [Member] | U.S. Mid-Cap Equity Index Funds [Member] | U.S. Equity Index Funds [Member] | Mutual Fund Equity Investments [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	3,911	2,928	'
Level 1 [Member] | U.S. Mid-Cap [Member] | U.S. Equity Funds [Member] | Mutual Fund Equity Investments [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	7,919	5,893	'
Level 1 [Member] | U.S. Small-Cap [Member] | U.S. Equity Funds [Member] | Mutual Fund Equity Investments [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	3,653	2,856	'
Level 2 [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	44,653	36,030	'
Level 2 [Member] | Cash equivalents [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	'	'	'
Level 2 [Member] | F.N.B. Corporation [Member] | Equity securities [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	'	'	'
Level 2 [Member] | Other Large-Cap U.S. Financial Services Companies [Member] | Equity securities [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	'	'	'
Level 2 [Member] | Other Large-Cap U.S. Companies [Member] | Equity securities [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	'	'	'
Level 2 [Member] | International Companies [Member] | Equity securities [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	'	'	'
Level 2 [Member] | Non-U.S. Equities Growth Fund [Member] | Mutual Fund Equity Investments [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	'	'	'
Level 2 [Member] | Other [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	'	'	'
Level 2 [Member] | U.S. Government Agencies [Member] | Fixed Income Securities [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	44,653	36,030	'
Level 2 [Member] | U.S. Investment-Grade Fixed Income Securities [Member] | Fixed Income Mutual Funds [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	'	'	'
Level 2 [Member] | Non-U.S. Fixed Income Securities [Member] | Fixed Income Mutual Funds [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	'	'	'
Level 2 [Member] | U.S. Large-Cap Equity Index Funds [Member] | U.S. Equity Index Funds [Member] | Mutual Fund Equity Investments [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	'	'	'
Level 2 [Member] | U.S. Small-Cap Equity Index Funds [Member] | U.S. Equity Index Funds [Member] | Mutual Fund Equity Investments [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	'	'	'
Level 2 [Member] | U.S. Mid-Cap Equity Index Funds [Member] | U.S. Equity Index Funds [Member] | Mutual Fund Equity Investments [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	'	'	'
Level 2 [Member] | U.S. Mid-Cap [Member] | U.S. Equity Funds [Member] | Mutual Fund Equity Investments [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	'	'	'
Level 2 [Member] | U.S. Small-Cap [Member] | U.S. Equity Funds [Member] | Mutual Fund Equity Investments [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	'	'	'
Level 3 [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	'	'	'
Level 3 [Member] | Cash equivalents [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	'	'	'
Level 3 [Member] | F.N.B. Corporation [Member] | Equity securities [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	'	'	'
Level 3 [Member] | Other Large-Cap U.S. Financial Services Companies [Member] | Equity securities [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	'	'	'
Level 3 [Member] | Other Large-Cap U.S. Companies [Member] | Equity securities [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	'	'	'
Level 3 [Member] | International Companies [Member] | Equity securities [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	'	'	'
Level 3 [Member] | Non-U.S. Equities Growth Fund [Member] | Mutual Fund Equity Investments [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	'	'	'
Level 3 [Member] | Other [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	'	'	'
Level 3 [Member] | U.S. Government Agencies [Member] | Fixed Income Securities [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	'	'	'
Level 3 [Member] | U.S. Investment-Grade Fixed Income Securities [Member] | Fixed Income Mutual Funds [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	'	'	'
Level 3 [Member] | Non-U.S. Fixed Income Securities [Member] | Fixed Income Mutual Funds [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	'	'	'
Level 3 [Member] | U.S. Large-Cap Equity Index Funds [Member] | U.S. Equity Index Funds [Member] | Mutual Fund Equity Investments [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	'	'	'
Level 3 [Member] | U.S. Small-Cap Equity Index Funds [Member] | U.S. Equity Index Funds [Member] | Mutual Fund Equity Investments [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	'	'	'
Level 3 [Member] | U.S. Mid-Cap Equity Index Funds [Member] | U.S. Equity Index Funds [Member] | Mutual Fund Equity Investments [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	'	'	'
Level 3 [Member] | U.S. Mid-Cap [Member] | U.S. Equity Funds [Member] | Mutual Fund Equity Investments [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	'	'	'
Level 3 [Member] | U.S. Small-Cap [Member] | U.S. Equity Funds [Member] | Mutual Fund Equity Investments [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	'	'	'

Income_Taxes_Summary_of_Income

Income Taxes - Summary of Income Tax Expense Allocated Based on Separate Tax Return Basis (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]	'	'	'
Current income taxes: Federal taxes	$33,614	$22,182	$18,721
Current income taxes: State taxes	-116	416	354
Current income taxes	33,498	22,598	19,075
Deferred income taxes: Federal taxes	11,258	21,175	12,929
Deferred income taxes: State taxes	'	'	'
Deferred income taxes	11,258	21,175	12,929
Income taxes	$44,756	$43,773	$32,004

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Contingency [Line Items]	'	'	'
Income tax expense related to gains on the sale of securities	$283	$107	$1,278
Expiration of an uncertain tax position impacting income tax expense and the effective tax rate	359	'	'
Unrecognized tax benefits	660	1,088	1,376
Unrecognized tax benefits relating to accrued interest, net of related federal tax benefits	69	150	'
Unrecognized tax benefits which affect the effective tax rate if recognized	498	'	'
Reduction in the unrecognized tax benefit due to statutes of limitations for next twelve months	$408	'	'
Minimum [Member]	'	'	'
Income Tax Contingency [Line Items]	'	'	'
Expiration of unused state net operating loss carryforwards	'2018	'	'
Maximum [Member]	'	'	'
Income Tax Contingency [Line Items]	'	'	'
Expiration of unused state net operating loss carryforwards	'2032	'	'

Income_Taxes_Summary_of_Reconc

Income Taxes - Summary of Reconciliation Between the Statutory Tax Rate and Actual Effective Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]	'	'	'
Statutory tax rate	35.00%	35.00%	35.00%
Effect of tax-free interest and dividend income	-4.30%	-4.70%	-5.90%
Tax credits and settlements	-2.40%	-1.80%	-1.90%
Life insurance	-0.40%	'	'
Other items	-0.40%	-0.10%	-0.30%
Actual effective tax rate	27.50%	28.40%	26.90%

Income_Taxes_Summary_of_Deferr

Income Taxes - Summary of Deferred Tax Assets and Liabilities from Tax Effects of Temporary Differences (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Income Tax Disclosure [Abstract]	'	'
Allowance for loan losses	$39,292	$36,714
Discount on purchased loans	41,012	24,339
Net operating loss/tax credit carryforwards	17,052	15,196
Deferred compensation	8,208	7,429
Securities impairments	20,371	19,999
Pension and other defined benefit plans	2,190	16,335
Net unrealized securities losses	13,295	'
Other	3,567	4,268
Total	144,987	124,280
Valuation allowance	-15,611	-16,329
Total deferred tax assets	129,376	107,951
Loan costs	-931	-287
Depreciation	-9,819	-9,794
Prepaid expenses	-1,261	-1,083
Amortizable intangibles	-11,346	-8,200
Lease financing	-6,290	-4,915
Debt discharge income deferral	-3,402	'
Originated mortgage servicing rights	-2,721	'
Other	-1,214	-1,089
Total deferred tax liabilities	-36,984	-25,368
Net deferred tax assets	$92,392	$82,583

Income_Taxes_Summary_of_Reconc1

Income Taxes - Summary of Reconciliation of the Beginning and Ending Amount of Unrecognized Tax Benefits (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]	'	'
Balance at beginning of year	$1,088	$1,376
Additions based on tax positions related to current year	74	87
Additions based on tax positions of prior year	'	'
Reductions for tax positions of prior years	'	'
Reductions due to expiration of statute of limitations	-502	-375
Balance at end of year	$660	$1,088

Comprehensive_Income_Changes_i

Comprehensive Income - Changes in Accumulated Other Comprehensive Income, Net of Tax, by Component (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'
Accumulated other comprehensive income (loss), balance at beginning of period	($46,224)	'	'
Other comprehensive income (loss) before reclassifications	-10,200	'	'
Amounts reclassified from accumulated other comprehensive income	-500	'	'
Net current period other comprehensive income (loss)	-10,700	-1,076	-11,416
Accumulated other comprehensive income (loss), balance at end of period	-56,924	-46,224	'
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	9,269	'	'
Other comprehensive income (loss) before reclassifications	-20,643	'	'
Amounts reclassified from accumulated other comprehensive income	-500	'	'
Net current period other comprehensive income (loss)	-21,143	'	'
Accumulated other comprehensive income (loss), balance at end of period	-11,874	'	'
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	-8,039	'	'
Other comprehensive income (loss) before reclassifications	1,847	'	'
Amounts reclassified from accumulated other comprehensive income	'	'	'
Net current period other comprehensive income (loss)	1,847	'	'
Accumulated other comprehensive income (loss), balance at end of period	-6,192	'	'
Unrealized Losses on Derivative Instruments [Member]	'	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'
Accumulated other comprehensive income (loss), balance at beginning of period	-171	'	'
Other comprehensive income (loss) before reclassifications	-6,415	'	'
Amounts reclassified from accumulated other comprehensive income	'	'	'
Net current period other comprehensive income (loss)	-6,415	'	'
Accumulated other comprehensive income (loss), balance at end of period	-6,586	'	'
Unrecognized Pension and Postretirement Obligations [Member]	'	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'
Accumulated other comprehensive income (loss), balance at beginning of period	-47,283	'	'
Other comprehensive income (loss) before reclassifications	15,011	'	'
Amounts reclassified from accumulated other comprehensive income	'	'	'
Net current period other comprehensive income (loss)	15,011	'	'
Accumulated other comprehensive income (loss), balance at end of period	($32,272)	'	'

Comprehensive_Income_Summary_o

Comprehensive Income - Summary of Reclassifications Out of Accumulated Other Comprehensive Income (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'
Net securities gains	$808	$305	$3,652
Tax (expense) benefit	44,756	43,773	32,004
Net Income	117,804	110,410	87,047
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	-767	'	'
Tax (expense) benefit	-267	'	'
Net Income	($500)	'	'

Earnings_Per_Share_Computation

Earnings Per Share - Computation of Basic and Diluted Earnings Per Common Share (Detail) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Earnings Per Share [Abstract]	'	'	'
Net income available to common stockholders	$117,804	$110,410	$87,047
Basic weighted average common shares outstanding	146,186,982	139,135,272	124,145,924
Net effect of dilutive stock options, warrants, restricted stock and convertible debt	1,622,522	1,504,893	866,154
Diluted weighted average common shares outstanding	147,809,504	140,640,165	125,012,078
Basic earnings per common share	$0.81	$0.79	$0.70
Diluted earnings per common share	$0.80	$0.79	$0.70

Earnings_Per_Share_Additional_

Earnings Per Share - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Earnings Per Share [Abstract]	'	'	'
Common stock excluded from computation of diluted earnings per share	49,995	172,709	392,299

Stockholders_Equity_Additional

Stockholders' Equity - Additional Information (Detail) (USD $)	0 Months Ended
In Thousands, except Share data, unless otherwise specified	Nov. 14, 2013	Nov. 01, 2013
Stockholders' Equity [Line Items]	'	'
Public offering, common stock	'	4,693,876
Common stock per share price	'	$12.25
Net proceeds from stock offerings	$161,316	'
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	'

Regulatory_Matters_Additional_

Regulatory Matters - Additional Information (Detail) (USD $)	1 Months Ended	3 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2013
Equity [Abstract]	'	'	'	'
Repurchased of debt	$15,000	'	$15,000	$15,000
Redemption in capital TPS	'	-115,000	'	-134,021
Trust Preferred Securities	'	74,000	'	74,000
Aggregate cash reserves with Federal Reserve Bank	'	18,679	'	18,679
Retained earnings available for distribution	'	116,806	'	116,806
Loan to non-bank affiliate, maximum percentage	'	'	'	10.00%
Aggregate of loan to non-bank affiliate, maximum percentage	'	'	'	20.00%
Maximum amount loans that Corporation can borrower under current provisions	'	$182,499	'	$182,499

Regulatory_Matters_Schedule_of

Regulatory Matters - Schedule of Capital Ratios (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
F.N.B. Corporation [Member]	'	'
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]	'	'
Total Capital to risk-weighted assets, Actual Amount	$1,258,312	$1,068,704
Tier 1 Capital to risk-weighted assets, Actual Amount	1,117,956	934,443
Leverage ratio, Actual Amount	1,117,956	934,443
Total Capital to risk-weighted assets, Actual Ratio	12.50%	12.20%
Tier 1 Capital to risk-weighted assets, Actual Ratio	11.10%	10.60%
Leverage ratio, Actual Ratio	8.80%	8.30%
Total Capital to risk-weighted assets, Well-Capitalized Requirements Amount	1,009,952	879,316
Tier 1 Capital to risk-weighted assets, Well-Capitalized Requirements Amount	605,971	527,589
Leverage ratio, Well-Capitalized Requirements Amount	634,527	563,649
Total capital to risk-weighted assets, Well-Capitalized Requirements Ratio	10.00%	10.00%
Tier 1 capital to risk-weighted assets, Well-Capitalized Requirements Ratio	6.00%	6.00%
Leverage ratio, Well-Capitalized Requirements Ratio	5.00%	5.00%
Total capital to risk-weighted assets, Minimum Capital Requirements Amount	807,962	703,453
Tier 1 capital to risk-weighted assets, Minimum Capital Requirements Amount	403,981	351,726
Leverage ratio, Minimum Capital Requirements Amount	507,622	450,919
Total capital to risk-weighted assets, Minimum Capital Requirements Ratio	8.00%	8.00%
Tier 1 capital to risk-weighted assets, Minimum Capital Requirements Ratio	4.00%	4.00%
Leverage ratio, Minimum Capital Requirements Ratio	4.00%	4.00%
FNBPA [Member]	'	'
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]	'	'
Total Capital to risk-weighted assets, Actual Amount	1,144,510	999,717
Tier 1 Capital to risk-weighted assets, Actual Amount	1,035,659	895,177
Leverage ratio, Actual Amount	1,035,659	895,177
Total Capital to risk-weighted assets, Actual Ratio	11.50%	11.60%
Tier 1 Capital to risk-weighted assets, Actual Ratio	10.40%	10.40%
Leverage ratio, Actual Ratio	8.30%	8.10%
Total Capital to risk-weighted assets, Well-Capitalized Requirements Amount	995,524	859,468
Tier 1 Capital to risk-weighted assets, Well-Capitalized Requirements Amount	597,314	515,681
Leverage ratio, Well-Capitalized Requirements Amount	623,921	555,360
Total capital to risk-weighted assets, Well-Capitalized Requirements Ratio	10.00%	10.00%
Tier 1 capital to risk-weighted assets, Well-Capitalized Requirements Ratio	6.00%	6.00%
Leverage ratio, Well-Capitalized Requirements Ratio	5.00%	5.00%
Total capital to risk-weighted assets, Minimum Capital Requirements Amount	796,419	687,574
Tier 1 capital to risk-weighted assets, Minimum Capital Requirements Amount	398,210	343,787
Leverage ratio, Minimum Capital Requirements Amount	$499,137	$444,288
Total capital to risk-weighted assets, Minimum Capital Requirements Ratio	8.00%	8.00%
Tier 1 capital to risk-weighted assets, Minimum Capital Requirements Ratio	4.00%	4.00%
Leverage ratio, Minimum Capital Requirements Ratio	4.00%	4.00%

Cash_Flow_Information_Summary_

Cash Flow Information - Summary of Cash Flow Information (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement Of Cash Flows [Abstract]	'	'	'
Interest paid on deposits and other borrowings	$46,337	$56,306	$75,178
Income taxes paid	34,200	22,250	13,250
Transfers of loans to other real estate owned	15,836	14,102	21,679
Transfers of other real estate owned to loans	$701	$839	$598

Business_Segments_Additional_I

Business Segments - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2013
	Segment
Segment Reporting [Abstract]	'
Number of reportable segments	4

Business_Segments_Financial_In

Business Segments - Financial Information for Segments of Corporation (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]	'	'	'
Interest income	$440,386	$431,906	$391,125
Interest expense	44,344	59,055	74,617
Net interest income	396,042	372,851	316,508
Provision for loan losses	31,090	31,302	33,641
Non-interest income	135,778	131,252	119,730
Non-interest expense	329,763	309,694	276,506
Intangible amortization	8,407	8,924	7,040
Income tax expense (benefit)	44,756	43,773	32,004
Net income (loss)	117,804	110,410	87,047
Total assets	13,563,405	12,023,976	9,786,483
Total intangibles	811,856	713,406	599,415
Operating Segments [Member] | Community Banking [Member]	'	'	'
Segment Reporting Information [Line Items]	'	'	'
Interest income	396,243	390,680	350,801
Interest expense	32,178	45,604	60,132
Net interest income	364,065	345,076	290,669
Provision for loan losses	23,502	24,606	26,957
Non-interest income	97,156	96,853	88,172
Non-interest expense	271,657	258,063	227,696
Intangible amortization	7,697	8,184	6,279
Income tax expense (benefit)	43,966	42,991	31,869
Net income (loss)	114,399	108,085	86,040
Total assets	13,381,047	11,845,122	9,583,439
Total intangibles	788,513	689,354	574,622
Operating Segments [Member] | Wealth Management [Member]	'	'	'
Segment Reporting Information [Line Items]	'	'	'
Interest income	'	4	11
Interest expense	'	'	'
Net interest income	'	4	11
Provision for loan losses	'	'	'
Non-interest income	28,717	24,152	23,238
Non-interest expense	25,067	20,141	18,518
Intangible amortization	304	320	335
Income tax expense (benefit)	1,248	1,358	1,587
Net income (loss)	2,098	2,337	2,809
Total assets	20,959	19,610	19,579
Total intangibles	11,008	11,312	11,632
Operating Segments [Member] | Insurance [Member]	'	'	'
Segment Reporting Information [Line Items]	'	'	'
Interest income	109	113	124
Interest expense	'	'	'
Net interest income	109	113	124
Provision for loan losses	'	'	'
Non-interest income	13,175	13,035	12,325
Non-interest expense	11,448	11,503	11,568
Intangible amortization	406	420	426
Income tax expense (benefit)	519	438	169
Net income (loss)	911	787	286
Total assets	20,214	18,675	17,301
Total intangibles	10,526	10,931	11,352
Operating Segments [Member] | Consumer Finance [Member]	'	'	'
Segment Reporting Information [Line Items]	'	'	'
Interest income	37,956	35,279	34,168
Interest expense	3,378	3,584	4,281
Net interest income	34,578	31,695	29,887
Provision for loan losses	6,834	6,115	6,152
Non-interest income	2,794	2,343	2,132
Non-interest expense	19,052	18,410	17,210
Intangible amortization	'	'	'
Income tax expense (benefit)	4,320	3,615	3,274
Net income (loss)	7,166	5,898	5,383
Total assets	188,259	178,149	171,350
Total intangibles	1,809	1,809	1,809
Parent and Other [Member]	'	'	'
Segment Reporting Information [Line Items]	'	'	'
Interest income	6,078	5,830	6,021
Interest expense	8,788	9,867	10,204
Net interest income	-2,710	-4,037	-4,183
Provision for loan losses	754	581	532
Non-interest income	-6,064	-5,131	-6,137
Non-interest expense	2,539	1,577	1,514
Intangible amortization	'	'	'
Income tax expense (benefit)	-5,297	-4,629	-4,895
Net income (loss)	-6,770	-6,697	-7,471
Total assets	-47,074	-37,580	-5,186
Total intangibles	'	'	'

Fair_Value_Measurements_Additi

Fair Value Measurements - Additional Information (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
	Securities	Securities
Fair Value Measurements Disclosure [Line Items]	'	'
Percentage of securities using market-based information	97.00%	'
Percentage of securities using model-based techniques	3.00%	'
Change in discount rate	1.00%	'
One percent change in affecting fair value of debt obligation, amount	$3,000	'
One percent change in affecting fair value of debt obligation, percent	7.00%	'
Minimum corporation reserves for commercial loan	500	'
Transfer between hierarchy levels	4	0
Change in unrealized gains or losses included in earnings relating to assets still held	78	'
Impaired loans, carrying amount	3,728	'
Allocated allowance for loan losses	825	'
Fair value of allocated allowance	3,294	'
Estimated costs to sell	391	'
Provision for fair value measurements included in allowance for loan losses	257	'
Carrying amount of OREO	20,830	'
Written down of OREO	17,060	'
Fair value of OREO	19,442	19,311
Estimated cost to sell OREO	2,381	'
Loss from OREO included in earnings	3,770	'
Short-term borrowings approximate fair value for amounts that mature, days, less than	'90 days	'
Assets Still Held [Member]	'	'
Fair Value Measurements Disclosure [Line Items]	'	'
Change in unrealized gains or losses included in earnings relating to assets still held	$27	$212
Minimum [Member]	'	'
Fair Value Measurements Disclosure [Line Items]	'	'
Valuation of investment securities basis spread on index	4.50%	'
Maximum [Member]	'	'
Fair Value Measurements Disclosure [Line Items]	'	'
Valuation of investment securities basis spread on index	14.00%	'

Fair_Value_Measurements_Balanc

Fair Value Measurements - Balances of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
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	$1,139,524	$1,170,676	'
Assets measured at fair value, Available for sale equity securities	2,126	2,007	'
Assets measured at fair value, Available for sale securities	1,141,650	1,172,683	640,571
Derivative financial instruments	33,317	58,008	'
Assets measured at fair value, Total	1,174,967	1,230,691	'
Derivative financial instruments	43,369	58,150	'
Liabilities measured at fair value, Total	43,369	58,150	'
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	330,985	354,457	'
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	250,881	275,150	'
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	491,199	469,547	'
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	1,762	2,729	'
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	17,002	24,824	'
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	22,456	'
Other Debt Securities [Member]	'	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'	'
Assets measured at fair value, Available for sale debt securities	16,100	21,513	'
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	2,061	1,962	'
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	65	45	'
Trading Assets [Member]	'	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'	'
Derivative financial instruments	33,317	58,008	'
Not for Trading Assets [Member]	'	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'	'
Derivative financial instruments	'	'	'
Trading Liabilities [Member]	'	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'	'
Derivative financial instruments	33,236	58,150	'
Not for Trading Liabilities [Member]	'	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'	'
Derivative financial instruments	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	'	'	'
Assets measured at fair value, Available for sale equity securities	649	396	'
Assets measured at fair value, Available for sale securities	649	396	'
Derivative financial instruments	'	'	'
Assets measured at fair value, Total	649	396	'
Liabilities measured at fair value, Total	'	'	'
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	'	'	'
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	'	'	'
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	'	'	'
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	'	'	'
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	'	'	'
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	'	'	'
Level 1 [Member] | Other Debt 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	584	351	'
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	65	45	'
Level 1 [Member] | Trading Assets [Member]	'	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'	'
Derivative financial instruments	'	'	'
Level 1 [Member] | Not for Trading Assets [Member]	'	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'	'
Derivative financial instruments	'	'	'
Level 1 [Member] | Trading Liabilities [Member]	'	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'	'
Derivative financial instruments	'	'	'
Level 1 [Member] | Not for Trading Liabilities [Member]	'	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'	'
Derivative financial instruments	'	'	'
Level 2 [Member]	'	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'	'
Assets measured at fair value, Available for sale debt securities	1,106,185	1,138,623	'
Assets measured at fair value, Available for sale equity securities	1,067	1,099	'
Assets measured at fair value, Available for sale securities	1,107,252	1,139,722	'
Derivative financial instruments	33,317	58,008	'
Assets measured at fair value, Total	1,140,569	1,197,730	'
Liabilities measured at fair value, Total	43,369	58,150	'
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	330,985	354,457	'
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	250,881	275,150	'
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	491,199	469,547	'
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	18	24	'
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	17,002	24,824	'
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	'	'	'
Level 2 [Member] | Other Debt Securities [Member]	'	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'	'
Assets measured at fair value, Available for sale debt securities	16,100	14,621	'
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	1,067	1,099	'
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	'	'	'
Level 2 [Member] | Trading Assets [Member]	'	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'	'
Derivative financial instruments	33,317	58,008	'
Level 2 [Member] | Not for Trading Assets [Member]	'	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'	'
Derivative financial instruments	'	'	'
Level 2 [Member] | Trading Liabilities [Member]	'	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'	'
Derivative financial instruments	33,236	58,150	'
Level 2 [Member] | Not for Trading Liabilities [Member]	'	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'	'
Derivative financial instruments	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	33,339	32,053	'
Assets measured at fair value, Available for sale equity securities	410	512	'
Assets measured at fair value, Available for sale securities	33,749	32,565	'
Derivative financial instruments	'	'	'
Assets measured at fair value, Total	33,749	32,565	'
Liabilities measured at fair value, Total	'	'	'
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	'	'	'
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	'	'	'
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	'	'	'
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	1,744	2,705	'
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	'	'	'
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	22,456	'
Level 3 [Member] | Other Debt Securities [Member]	'	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'	'
Assets measured at fair value, Available for sale debt securities	'	6,892	'
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	410	512	'
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	'	'	'
Level 3 [Member] | Trading Assets [Member]	'	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'	'
Derivative financial instruments	'	'	'
Level 3 [Member] | Not for Trading Assets [Member]	'	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'	'
Derivative financial instruments	'	'	'
Level 3 [Member] | Trading Liabilities [Member]	'	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'	'
Derivative financial instruments	'	'	'
Level 3 [Member] | Not for Trading Liabilities [Member]	'	'	'
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]	'	'	'
Derivative financial instruments	'	'	'

Fair_Value_Measurements_Additi1

Fair Value Measurements - Additional Information about Assets Measured at Fair Value on Recurring Basis (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'
Balance at beginning of period	$32,565	$11,603
Total gains (losses) - realized/unrealized, Included in earnings	78	'
Total gains (losses) - realized/unrealized, Included in other comprehensive income	6,705	1,802
Accretion included in earnings	3,176	2,544
Purchases	'	21,753
Issuances	38	46
Sales/redemptions	-1,033	-2,542
Settlements	-1,698	-2,641
Transfers from Level 3	-6,082	'
Transfers into Level 3	'	'
Balance at end of period	33,749	32,565
Pooled Trust Preferred Collateralized Debt Obligations [Member]	'	'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'
Balance at beginning of period	22,456	5,998
Total gains (losses) - realized/unrealized, Included in earnings	'	'
Total gains (losses) - realized/unrealized, Included in other comprehensive income	6,701	917
Accretion included in earnings	3,160	2,515
Purchases	'	16,569
Issuances	38	46
Sales/redemptions	'	-2,542
Settlements	-760	-1,047
Transfers from Level 3	'	'
Transfers into Level 3	'	'
Balance at end of period	31,595	22,456
Other Debt Securities [Member]	'	'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'
Balance at beginning of period	6,892	5,197
Total gains (losses) - realized/unrealized, Included in earnings	78	'
Total gains (losses) - realized/unrealized, Included in other comprehensive income	21	732
Accretion included in earnings	4	9
Purchases	'	954
Issuances	'	'
Sales/redemptions	-1,033	'
Settlements	'	'
Transfers from Level 3	-5,962	'
Transfers into Level 3	'	'
Balance at end of period	'	6,892
Equity securities [Member]	'	'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'
Balance at beginning of period	512	408
Total gains (losses) - realized/unrealized, Included in earnings	'	'
Total gains (losses) - realized/unrealized, Included in other comprehensive income	18	104
Accretion included in earnings	'	'
Purchases	'	'
Issuances	'	'
Sales/redemptions	'	'
Settlements	'	'
Transfers from Level 3	-120	'
Transfers into Level 3	'	'
Balance at end of period	410	512
Residential Non-Agency Collateralized Mortgage Obligations [Member]	'	'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'
Balance at beginning of period	2,705	'
Total gains (losses) - realized/unrealized, Included in earnings	'	'
Total gains (losses) - realized/unrealized, Included in other comprehensive income	-35	49
Accretion included in earnings	12	20
Purchases	'	4,230
Issuances	'	'
Sales/redemptions	'	'
Settlements	-938	-1,594
Transfers from Level 3	'	'
Transfers into Level 3	'	'
Balance at end of period	$1,744	$2,705

Fair_Value_Measurements_Additi2

Fair Value Measurements - Additional Information about Assets Measured at Fair Value on Non-Recurring Basis (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]	'	'
Impaired loans	$3,294	$17,496
Other real estate owned	19,442	19,311
Investment security, held-to-maturity:	'	'
Non-agency CMO	'	3,636
Level 1 [Member]	'	'
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]	'	'
Impaired loans	'	'
Other real estate owned	'	'
Investment security, held-to-maturity:	'	'
Non-agency CMO	'	'
Level 2 [Member]	'	'
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]	'	'
Impaired loans	3,235	14,325
Other real estate owned	4,485	5,771
Investment security, held-to-maturity:	'	'
Non-agency CMO	'	'
Level 3 [Member]	'	'
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]	'	'
Impaired loans	59	3,171
Other real estate owned	14,957	13,540
Investment security, held-to-maturity:	'	'
Non-agency CMO	'	$3,636

Fair_Value_Measurements_Fair_V

Fair Value Measurements - Fair Values of Corporation's Financial Instruments (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Jan. 02, 2011
In Thousands, unless otherwise specified
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'	'
Cash and cash equivalents	$213,981	$239,044	$208,953	$131,571
Securities available for sale	1,141,650	1,172,683	640,571	'
Securities held to maturity	1,199,169	1,106,563	917,212	'
Net loans, including loans held for sale	9,402,448	8,061,096	'	'
Bank owned life insurance	289,402	246,088	'	'
Derivative assets	33,317	58,008	'	'
Accrued interest receivable	35,520	30,210	'	'
Deposits	10,198,232	9,082,174	'	'
Short-term borrowings	1,241,239	1,083,138	'	'
Long-term debt	143,928	89,425	'	'
Junior subordinated debt	75,205	204,019	'	'
Derivative liabilities	43,369	58,150	'	'
Accrued interest payable	7,061	9,054	'	'
Level 1 [Member]	'	'	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'	'
Securities available for sale	649	396	'	'
Derivative assets	'	'	'	'
Level 2 [Member]	'	'	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'	'
Securities available for sale	1,107,252	1,139,722	'	'
Derivative assets	33,317	58,008	'	'
Level 3 [Member]	'	'	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'	'
Securities available for sale	33,749	32,565	'	'
Derivative assets	'	'	'	'
Fair Value [Member]	'	'	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'	'
Cash and cash equivalents	213,981	239,044	'	'
Securities available for sale	1,141,650	1,172,683	'	'
Securities held to maturity	1,189,563	1,143,213	'	'
Net loans, including loans held for sale	9,243,780	7,996,554	'	'
Bank owned life insurance	292,694	257,060	'	'
Derivative assets	33,317	58,008	'	'
Accrued interest receivable	35,520	30,210	'	'
Deposits	10,208,268	9,117,757	'	'
Short-term borrowings	1,241,239	1,083,138	'	'
Long-term debt	145,995	92,329	'	'
Junior subordinated debt	70,442	172,246	'	'
Derivative liabilities	43,369	58,150	'	'
Accrued interest payable	7,061	9,054	'	'
Fair Value [Member] | Level 1 [Member]	'	'	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'	'
Cash and cash equivalents	213,981	239,044	'	'
Securities available for sale	649	396	'	'
Securities held to maturity	'	'	'	'
Net loans, including loans held for sale	'	'	'	'
Bank owned life insurance	292,694	257,060	'	'
Derivative assets	'	'	'	'
Accrued interest receivable	35,520	30,210	'	'
Deposits	7,592,159	6,546,316	'	'
Short-term borrowings	1,241,239	1,083,138	'	'
Long-term debt	'	'	'	'
Junior subordinated debt	'	'	'	'
Derivative liabilities	'	'	'	'
Accrued interest payable	7,061	9,054	'	'
Fair Value [Member] | Level 2 [Member]	'	'	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'	'
Cash and cash equivalents	'	'	'	'
Securities available for sale	1,107,252	1,139,722	'	'
Securities held to maturity	1,182,671	1,128,524	'	'
Net loans, including loans held for sale	'	'	'	'
Bank owned life insurance	'	'	'	'
Derivative assets	33,317	58,008	'	'
Accrued interest receivable	'	'	'	'
Deposits	2,616,109	2,571,441	'	'
Short-term borrowings	'	'	'	'
Long-term debt	'	'	'	'
Junior subordinated debt	'	'	'	'
Derivative liabilities	43,369	58,150	'	'
Accrued interest payable	'	'	'	'
Fair Value [Member] | Level 3 [Member]	'	'	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'	'
Cash and cash equivalents	'	'	'	'
Securities available for sale	33,749	32,565	'	'
Securities held to maturity	6,892	14,689	'	'
Net loans, including loans held for sale	9,243,780	7,966,554	'	'
Bank owned life insurance	'	'	'	'
Derivative assets	'	'	'	'
Accrued interest receivable	'	'	'	'
Deposits	'	'	'	'
Short-term borrowings	'	'	'	'
Long-term debt	145,995	92,329	'	'
Junior subordinated debt	70,442	172,246	'	'
Derivative liabilities	'	'	'	'
Accrued interest payable	'	'	'	'

Parent_Company_Financial_State2

Parent Company Financial Statements - Consolidated Balance Sheet of Parent Company Only (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Jan. 02, 2011
In Thousands, unless otherwise specified
Cash and cash equivalents	$213,981	$239,044	$208,953	$131,571
Securities available for sale	1,141,650	1,172,683	640,571	'
Other assets	350,867	344,729	'	'
Total assets	13,563,405	12,023,976	9,786,483	'
Other liabilities	130,418	163,151	'	'
Junior subordinated debt	75,205	204,019	'	'
Long-term	84,637	79,897	'	'
Total Liabilities	11,789,022	10,621,907	'	'
Stockholders' Equity	1,774,383	1,402,069	1,210,199	1,066,124
Total Liabilities and Stockholders' Equity	13,563,405	12,023,976	'	'
Parent Company [Member]	'	'	'	'
Cash and cash equivalents	145,910	114,654	166,058	91,560
Securities available for sale	2,061	1,962	'	'
Other assets	18,387	15,856	'	'
Total assets	2,180,033	1,940,822	'	'
Other liabilities	25,225	28,381	'	'
Advances from affiliates	294,245	295,100	'	'
Junior subordinated debt	76,290	205,156	'	'
Short-term	8,439	8,355	'	'
Long-term	1,451	1,761	'	'
Total Liabilities	405,650	538,753	'	'
Stockholders' Equity	1,774,383	1,402,069	'	'
Total Liabilities and Stockholders' Equity	2,180,033	1,940,822	'	'
Parent Company [Member] | Bank Subsidiary [Member]	'	'	'	'
Investment in and advances to subsidiaries	1,759,551	1,554,543	'	'
Parent Company [Member] | Non-bank Subsidiaries [Member]	'	'	'	'
Investment in and advances to subsidiaries	$254,124	$253,807	'	'

Parent_Company_Financial_State3

Parent Company Financial Statements - Statements of Income of Parent Company Only (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Dividend income from subsidiaries	$103	$375	$157
Interest income	440,386	431,906	391,125
Other income	129	210	275
Interest expense	44,344	59,055	74,617
Income Before Taxes and Equity in Undistributed Income of Subsidiaries	162,560	154,183	119,051
Income tax benefit	44,756	43,773	32,004
Net income	117,804	110,410	87,047
Parent Company [Member]	'	'	'
Dividend income from subsidiaries	83,103	80,812	73,768
Interest income	5,277	5,802	6,172
Equity in undistributed income (loss) of subsidiaries	43,804	39,489	23,681
Other income	1,874	1,442	71
Total Income	90,254	88,056	80,011
Interest expense	14,325	15,646	16,744
Other expenses	8,196	7,640	6,197
Total Expenses	22,521	23,286	22,941
Income Before Taxes and Equity in Undistributed Income of Subsidiaries	67,733	64,770	57,070
Income tax benefit	6,267	6,151	6,296
Income after income taxes	74,000	70,921	63,366
Net income	117,804	110,410	87,047
Parent Company [Member] | Bank [Member]	'	'	'
Dividend income from subsidiaries	77,153	74,412	65,130
Equity in undistributed income (loss) of subsidiaries	42,094	38,401	25,508
Parent Company [Member] | Non-Bank [Member]	'	'	'
Dividend income from subsidiaries	5,950	6,400	8,638
Equity in undistributed income (loss) of subsidiaries	$1,710	$1,088	($1,827)

Parent_Company_Financial_State4

Parent Company Financial Statements - Statements of Cash Flows of Parent Company Only (Detail) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Supplemental Cash Flow Information [Line Items]	'	'	'
Net income	$117,804	$110,410	$87,047
Other, net	14,280	34,848	34,989
Net cash flows provided by operating activities	386,084	544,030	289,530
Proceeds from sale of securities available for sale	22,047	87,101	101,973
Net cash flows used in investing activities	-644,410	-793,503	-284,030
Decrease in long-term debt	-113,967	-197,568	-166,144
Increase in long-term debt	92,583	40,315	52,827
Decrease in junior subordinated debt	-134,021	'	'
Net proceeds from issuance of preferred stock	106,882	'	'
Net proceeds from issuance of common stock	62,092	8,895	71,053
Tax benefit (expense) of stock-based compensation	1,326	386	-61
Cash dividends paid	-71,246	-67,646	-60,686
Net cash flows (used in) provided by financing activities	233,263	279,564	71,882
Net Increase (Decrease) in Cash and Cash Equivalents	-25,063	30,091	77,382
Cash and cash equivalents at beginning of year	239,044	208,953	131,571
Cash and Cash Equivalents at End of Year	213,981	239,044	208,953
Interest	46,337	56,306	75,178
Parent Company [Member]	'	'	'
Supplemental Cash Flow Information [Line Items]	'	'	'
Net income	117,804	110,410	87,047
Undistributed earnings from subsidiaries	-43,804	-39,489	-23,681
Other, net	-6,218	109	8,666
Net cash flows provided by operating activities	67,782	71,030	72,032
Proceeds from sale of securities available for sale	128	201	389
(Increase) decrease in property, plant and equipment	'	4,193	-243
Net decrease (increase) in advances to subsidiaries	1,080	-1,349	-7,551
Net increase in investment in subsidiaries	-1,688	-79,450	-16,611
Net cash flows used in investing activities	-480	-76,405	-24,016
Net (decrease) increase in advance from affiliate	-854	12,944	16,900
Net increase (decrease) in short-term borrowings	84	-2	-316
Decrease in long-term debt	-808	-1,277	-1,206
Increase in long-term debt	499	671	798
Decrease in junior subordinated debt	-134,021	'	'
Net proceeds from issuance of preferred stock	106,882	'	'
Net proceeds from issuance of common stock	62,092	8,895	71,053
Tax benefit (expense) of stock-based compensation	1,326	386	-61
Cash dividends paid	-71,246	-67,646	-60,686
Net cash flows (used in) provided by financing activities	-36,046	-46,029	26,482
Net Increase (Decrease) in Cash and Cash Equivalents	31,256	-51,404	74,498
Cash and cash equivalents at beginning of year	114,654	166,058	91,560
Cash and Cash Equivalents at End of Year	145,910	114,654	166,058
Interest	$14,345	$15,690	$16,768