F.N.B. (FNB) 10-K 26 Feb 16 2015 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2015	Feb. 15, 2016	Jun. 30, 2015
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2015
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	FY
Trading Symbol	FNB
Entity Registrant Name	FNB CORP/FL/
Entity Central Index Key	37,808
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		209,445,037
Entity Public Float			$ 2,405,282,056

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Assets
Cash and due from banks	$ 207,399	$ 196,240
Interest-bearing deposits with banks	281,720	91,153
Cash and Cash Equivalents	489,119	287,393
Securities available for sale	1,630,567	1,534,065
Securities held to maturity (fair value of $1,643,416 and $1,468,258)	1,637,061	1,453,355
Residential mortgage loans held for sale	4,781	6,180
Loans and leases, net of unearned income of $51,642 and $56,131	12,190,440	11,247,038
Allowance for credit losses	(142,012)	(125,926)
Net Loans and Leases	12,048,428	11,121,112
Premises and equipment, net	159,080	168,756
Goodwill	833,086	832,213
Core deposit and other intangible assets, net	45,644	47,504
Bank owned life insurance	308,192	301,771
Other assets	401,704	374,741
Total Assets	17,557,662	16,127,090
Liabilities
Non-interest-bearing demand	3,059,949	2,647,623
Interest-bearing demand	5,311,589	4,547,628
Savings	1,786,459	1,575,922
Certificates and other time deposits	2,465,466	2,611,035
Total Deposits	12,623,463	11,382,208
Short-term borrowings	2,048,896	2,041,658
Long-term borrowings	641,480	541,443
Other liabilities	147,641	140,325
Total Liabilities	15,461,480	14,105,634
Stockholders' Equity
Preferred stock - $0.01 par value Authorized - 20,000,000 shares Issued - 110,877 shares	106,882	106,882
Common stock - $0.01 par value Authorized - 500,000,000 shares Issued - 176,595,060 and 175,450,303 shares	1,766	1,754
Additional paid-in capital	1,808,210	1,798,984
Retained earnings	243,217	176,120
Accumulated other comprehensive loss	(51,133)	(46,003)
Treasury stock - 1,153,390 and 1,458,045 shares at cost	(12,760)	(16,281)
Total Stockholders' Equity	2,096,182	2,021,456
Total Liabilities and Stockholders' Equity	$ 17,557,662	$ 16,127,090

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Securities held to maturity, fair value	$ 1,643,416	$ 1,468,258
Unearned income on loans	$ 51,642	$ 56,131
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	20,000,000	20,000,000
Preferred stock, shares issued	110,877	110,877
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	176,595,060	175,450,303
Treasury stock, shares	1,153,390	1,458,045

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Interest Income
Loans and leases, including fees	$ 482,086	$ 449,502	$ 390,983
Securities:
Taxable	58,148	53,877	43,504
Nontaxable	6,405	5,282	5,667
Dividends	39	228	103
Other	117	94	129
Total Interest Income	546,795	508,983	440,386
Interest Expense
Deposits	31,207	29,603	29,441
Short-term borrowings	7,075	5,638	4,423
Long-term borrowings	10,291	7,445	10,480
Total Interest Expense	48,573	42,686	44,344
Net Interest Income	498,222	466,297	396,042
Provision for credit losses	40,441	38,648	31,090
Net Interest Income After Provision for Credit Losses	457,781	427,649	364,952
Non-Interest Income
Impairment losses on securities			(27)
Net impairment losses on securities			(27)
Service charges	70,698	68,267	68,221
Trust	20,934	19,365	16,751
Insurance commissions and fees	16,270	16,758	16,598
Securities commissions and fees	13,642	11,453	11,286
Net securities gains	822	11,717	808
Mortgage banking operations	8,619	3,705	3,452
Bank owned life insurance	8,010	7,716	6,874
Other	23,415	19,293	11,815
Total Non-Interest Income	162,410	158,274	135,778
Non-Interest Expense
Salaries and employee benefits	202,068	195,016	179,971
Net occupancy	33,670	32,281	26,474
Equipment	31,869	29,245	25,214
Amortization of intangibles	8,305	9,717	8,407
Outside services	34,698	33,208	30,257
FDIC insurance	12,888	13,258	10,192
Supplies	8,064	7,102	6,887
State taxes	8,139	6,954	4,256
Telephone	6,234	5,710	5,063
Advertising and promotional	8,396	7,824	6,349
Loan related	6,161	4,933	3,945
Other real estate owned	4,637	4,401	3,215
Merger and acquisition related	3,033	9,611	8,210
Other	22,387	19,993	19,730
Total Non-Interest Expense	390,549	379,253	338,170
Income Before Income Taxes	229,642	206,670	162,560
Income taxes	69,993	62,620	44,756
Net Income	159,649	144,050	117,804
Preferred stock dividends	8,041	8,352
Net Income Available to Common Stockholders	$ 151,608	$ 135,698	$ 117,804
Net Income per Common Share
Basic	$ 0.87	$ 0.81	$ 0.81
Diluted	0.86	0.80	0.80
Cash Dividends Paid per Common Share	$ 0.48	$ 0.48	$ 0.48

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 159,649	$ 144,050	$ 117,804
Securities available for sale:
Unrealized (losses) gains arising during the period, net of tax (benefit) expense of $(1,561), $13,593, and $(10,121)	(2,899)	25,242	(18,796)
Reclassification adjustment for gains included in net income, net of tax expense of $288, $4,101 and $269	(534)	(7,616)	(500)
Derivative instruments:
Unrealized gains (losses) arising during the period, net of tax expense (benefit) of $1,989, $4,629 and $(3,165)	3,694	8,597	(5,878)
Reclassification adjustment for gains included in net income, net of tax expense of $1,137, $1,160 and $289	(2,111)	(2,154)	(537)
Pension and postretirement benefit obligations:
Unrealized (losses) gains arising during the period, net of tax (benefit) expense of $(1,766), $(7,080) and $8,083	(3,280)	(13,148)	15,011
Other comprehensive (loss) income	(5,130)	10,921	(10,700)
Comprehensive income	$ 154,519	$ 154,971	$ 107,104

Consolidated Statements of Com6

Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Unrealized (losses) gains arising during the period, net of tax (benefit) expense	$ (1,561)	$ 13,593	$ (10,121)
Reclassification adjustment for gains included in net income, tax expense	288	4,101	269
Unrealized gains (losses) arising during the period, tax expense (benefit)	1,989	4,629	(3,165)
Reclassification adjustment for gains included in net income, tax expense	1,137	1,160	289
Unrealized (losses) gains arising during the period, net of tax (benefit) expense	$ (1,766)	$ (7,080)	$ 8,083

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]
Balance at Dec. 31, 2012	$ 1,402,069		$ 1,398	$ 1,376,601	$ 75,312	$ (46,224)	$ (5,018)
Comprehensive income	107,104				117,804	(10,700)
Dividends declared:
Common stock: $0.48/share	(71,246)				(71,246)
Issuance of preferred stock	106,882	$ 106,882
Issuance of common stock	56,877		59	58,954			(2,136)
Issuance of common stock - acquisitions	166,129		135	165,994
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)
Comprehensive income	154,971				144,050	10,921
Dividends declared:
Preferred stock	(8,352)				(8,352)
Common stock: $0.48/share	(81,220)				(81,220)
Issuance of common stock	5,192		23	14,524	(228)		(9,127)
Issuance of common stock - acquisitions	170,150		139	170,011
Restricted stock compensation	3,618			3,618
Tax benefit of stock-based compensation	2,714			2,714
Balance at Dec. 31, 2014	2,021,456	106,882	1,754	1,798,984	176,120	(46,003)	(16,281)
Comprehensive income	154,519				159,649	(5,130)
Dividends declared:
Preferred stock	(8,041)				(8,041)
Common stock: $0.48/share	(84,511)				(84,511)
Issuance of common stock	8,270		12	4,737			3,521
Restricted stock compensation	4,461			4,461
Tax benefit of stock-based compensation	28			28
Balance at Dec. 31, 2015	$ 2,096,182	$ 106,882	$ 1,766	$ 1,808,210	$ 243,217	$ (51,133)	$ (12,760)

Consolidated Statements of Sto8

Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Stockholders' Equity [Abstract]
Common stock dividends per share	$ 0.48	$ 0.48	$ 0.48

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating Activities
Net income	$ 159,649	$ 144,050	$ 117,804
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation, amortization and accretion	43,949	40,119	30,768
Provision for credit losses	40,441	38,648	31,090
Deferred tax expense	550	44,113	15,291
Net securities gains	(822)	(11,717)	(808)
Other-than-temporary impairment losses on securities			27
Tax benefit of stock-based compensation	(28)	(2,714)	(1,326)
Loans originated for sale	(445,558)	(162,010)	(219,324)
Loans sold	455,623	168,533	243,782
Gain on sale of loans	(8,666)	(5,565)	(3,845)
Net change in:
Interest receivable	(4,688)	(2,211)	(1,675)
Interest payable	760	(875)	(2,173)
Securities classified as trading in business combination and sold		241,595	125,800
Bank owned life insurance	(6,397)	(10,401)	(3,598)
Other, net	(11,333)	(34,746)	14,280
Net cash flows provided by operating activities	223,480	446,819	346,093
Investing Activities
Net increase in loans and leases	(985,999)	(1,192,618)	(643,568)
Securities available for sale:
Purchases	(421,901)	(829,800)	(375,222)
Sales	33,499	175,872	22,047
Maturities	284,483	303,875	345,528
Securities held to maturity:
Purchases	(465,597)	(475,579)	(373,136)
Sales		4,570	17,428
Maturities	277,967	213,730	285,765
Purchase of bank owned life insurance	(72,688)	(16)	(10,016)
Withdrawal/surrender of bank owned life insurance	72,664	21,968
Increase in premises and equipment	(9,723)	(20,238)	(14,882)
Net cash received in business combinations	144,629	59,980	141,637
Net cash flows used in investing activities	(1,142,666)	(1,738,256)	(604,419)
Financing Activities
Demand (non-interest-bearing and interest-bearing) and savings accounts	1,259,765	652,808	458,153
Time deposits	(166,283)	(292,026)	(312,242)
Short-term borrowings	7,238	789,318	143,703
Increase of long-term borrowings	134,953	385,656	92,583
Repayment of long-term borrowings	(34,968)	(96,906)	(247,988)
Net proceeds from issuance of preferred stock			106,882
Net proceeds from issuance of common stock	12,731	12,857	62,092
Tax benefit of stock-based compensation	28	2,714	1,326
Cash dividends paid:
Preferred stock	(8,041)	(8,352)
Common stock	(84,511)	(81,220)	(71,246)
Net cash flows provided by financing activities	1,120,912	1,364,849	233,263
Net Increase (Decrease) in Cash and Cash Equivalents	201,726	73,412	(25,063)
Cash and cash equivalents at beginning of year	287,393	213,981	239,044
Cash and Cash Equivalents at End of Year	$ 489,119	$ 287,393	$ 213,981

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2015
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 (FNIA), LLC, Regency, Bank Capital Services, LLC, and F.N.B. Capital Corporation, 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 credit 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. 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 acquired in conjunction with acquisitions during 2014 and 2013 were classified as trading securities and were carried at fair value, with unrealized gains (losses) reflected through the consolidated statement of income. The Corporation both acquired and sold these trading securities during the quarters in which each of the acquisitions occurred. As of December 31, 2015 and 2014, 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 securities 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 investments’ 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. 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. 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 (AOCI), net of tax. Amounts are reclassified from AOCI 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 Mortgage Loans Held for Sale and Loan Commitments Certain residential mortgage loans are originated for sale in the secondary mortgage loan market with the majority 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 collectability 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 collectability. A loan is returned to accrual status when principal and interest are no longer past due and collectability 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 credit 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 Credit Losses The allowance for credit losses is established as losses are estimated to have occurred through a provision charged to earnings. Loan losses are charged against the allowance for credit losses when management believes the uncollectability of a loan balance is confirmed. Subsequent recoveries, if any, are credited to the allowance for credit losses. Allowances for impaired commercial loans over $500 are generally determined based on collateral values or the present value of estimated cash flows. All other impaired loans are evaluated in the aggregate based on loan segment loss given default. Changes in the allowance for credit losses related to impaired loans are charged or credited to the provision for credit losses. The allowance for credit 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 credit 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 credit losses is inherently subjective as it requires significant estimates, including the amounts and timing of expected future cash flows on impaired loans, estimated losses on pools of homogeneous loans based on transition matrices with predefined loss emergence periods and consideration of qualitative factors, all of which are susceptible to significant change. Credit impaired loans obtained through acquisitions are accounted for under the provisions of ASC 310-30. The Corporation also accounts for certain acquired loans considered performing at the time of acquisition by analogy to ASC 310-30. ASC 310-30 requires the initial recognition of acquired loans at the present value of amounts expected to be received. Any deterioration in the credit quality of acquired loans subsequent to acquisition would be considered in the allowance for credit 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 credit 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 credit 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 credit losses resulting in an increase in the allowance for credit 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 accelerated methods. Customer renewal lists and mortgage servicing rights are amortized over their estimated useful lives which range from eight to thirteen 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 quantitative 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 quantitative 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, 2015. 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 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. Retirement 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 Stock Based Compensation The Corporation accounts for its stock based compensation awards in accordance with ASC 718, Compensation – Stock Compensation, 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 f

New Accounting Standards

New Accounting Standards	12 Months Ended
	Dec. 31, 2015
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
New Accounting Standards	2. New Accounting Standards Financial Instruments – Recognition and Measurement In January 2016, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2016-01, Financial Instruments-Overall: Recognition and Measurement of Financial Assets and Financial Liabilities. The new guidance requires entities to measure investments in certain equity securities and other equity investments at the end of each reporting period at fair value, and to recognize changes therein in net income for the period. Financial liabilities measured using the FVO in ASC 825 will present separately in OCI the change in fair value caused by a change in instrument-specific credit risk. This change amends current US GAAP which requires the entire change in fair value to be recognized through earnings. The new guidance also requires certain additional disclosures in the statement of financial position or in the accompanying notes to the financial statements. In addition, entities will be required to use the exit price when measuring the fair value of financial instruments carried at amortized cost. The guidance is effective for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption of this guidance is not permitted except for the provision requiring recognition of the fair value changes caused by a change in instrument-specific credit risk in OCI for financial liabilities measured using the FVO in ASC 825. The adoption of this update is not expected to have a material effect on the consolidated financial statements, results of operations or liquidity of the Corporation. Business Combinations – Simplifying the Accounting for Measurement-Period Adjustments In September 2015, the FASB issued ASU No. 2015-16, Business Combinations: Simplifying the Accounting for Measurement-Period Adjustments. Insurance – Disclosures about Short-Duration Contracts In May 2015, the FASB issued ASU No. 2015-09, Financial Services–Insurance: Disclosures about Short-Duration Contracts. Cloud Computing Arrangements In April 2015, the FASB issued ASU No. 2015-05, Intangibles-Goodwill and Other-Internal-Use Software Customer’s Accounting for Fees Paid in a Cloud Computing Arrangement. Interest – Imputation of Interest In April 2015, the FASB issued ASU No. 2015-03, Interest–Imputation of Interest: Simplifying the Presentation of Debt Issuance Costs. Consolidation In February 2015, the FASB issued ASU No. 2015-02, Consolidation: Amendments to the Consolidation Analysis Presentation of Financial Statements In August 2014, the FASB issued ASU No. 2014-15, Presentation of Financial Statements–Going Concern: Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern, Stock Compensation In June, 2014, the FASB issued ASU No. 2014-12, Compensation-Stock Compensation: Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved After the Requisite Service Period. Revenue Recognition In May, 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers, to clarify the principles for recognizing revenue and to improve financial reporting by creating a single, principle-based revenue recognition framework. The core principle requires an entity to recognize revenue in a manner that depicts the transfer of promised goods and services to customers at an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. All arrangements involving the transfer of goods and services to customers are within the scope of the guidance, except for certain contracts subject to other U.S. GAAP guidance, including lease contracts and rights and obligations related to financing arrangements and financial instruments. The guidance is effective for annual reporting periods beginning after December 15, 2017. Early adoption is permitted, but not before annual reporting periods beginning after December 15, 2016. The guidance can be adopted using either the full retrospective approach or a modified retrospective approach. The Corporation will apply the guidance using a modified retrospective approach. The Corporation is in process of assessing the potential impact the adoption of this guidance will have on its consolidated financial statements.

Mergers and Acquisitions

Mergers and Acquisitions	12 Months Ended
	Dec. 31, 2015
Business Combinations [Abstract]
Mergers and Acquisitions	3. Mergers and Acquisitions Metro Bancorp, Inc. On February 13, 2016, the Corporation completed its acquisition of Metro Bancorp, Inc. (METR), a bank holding company based in Harrisburg, Pennsylvania. The acquisition continues the Corporation’s growth strategy, including expanding its geographic footprint in markets throughout central Pennsylvania. Additionally, cost savings, efficiencies and other benefits are expected from the combined operations. On the acquisition date, METR had assets with a net book value of approximately $2,854,896, including $1,980,790 in loans, and deposits with a net book value of approximately $2,326,313. The acquisition was valued at approximately $402,990 and resulted in the Corporation issuing 34,041,181 shares of its common stock in exchange for 14,345,319 shares of METR common stock. The Corporation also acquired the fully vested outstanding stock options of METR. The merger will be accounted for in accordance with the acquisition method of accounting. Preliminary fair values for all assets and liabilities are not reported herein as the Corporation is undertaking a comprehensive review and determination of the fair values of the assets and liabilities of METR to ensure that they conform to the measurement and reporting guidance set forth for the accounting for business combinations. Determining the fair value of assets and liabilities, especially in the loan portfolio, is a complex process involving significant judgment regarding estimates and assumptions used to calculate fair values. Accordingly, the initial accounting for the merger is not complete. Goodwill expected to be recorded in the transaction will not be deductible for income tax purposes as the acquisition is accounted for as a tax-free exchange for tax purposes. The Corporation incurred merger expenses of $1,260 related to the METR acquisition for the year ended December 31, 2015. The following pro forma financial information for the year ended December 31, 2015 reflects the Corporation’s estimated consolidated pro forma results of operations as if the METR acquisition occurred on January 1, 2015, unadjusted for potential cost savings: Revenue (net interest income and non-interest income) $ 790,391 Net income 171,850 Net income available to common stockholders 163,809 Earnings per common share – basic 0.78 Earnings per common share – diluted 0.78 Branch Purchase – Bank of America On September 18, 2015, the Corporation completed its purchase of five branch-banking locations in southeastern Pennsylvania from Bank of America (BofA). The fair value of the acquired assets totaled $154,619, including $148,159 in cash, $4,485 in goodwill and intangible assets, and $1,975 in fixed and other assets. The Corporation also assumed $154,619 in deposits associated with these branches. The Corporation paid a deposit premium of 1.94% and acquired an immaterial amount of loans as part of the transaction. The Corporation’s operating results for 2015 includes the impact of branch activity subsequent to the September 18, 2015 closing date. Goodwill of $1,485 for this transaction is expected to be deductible for income tax purposes. Insurance Brokerage – Conway E&S, Inc. On July 18, 2015, the Corporation, through its wholly-owned subsidiary, FNIA, acquired certain account assets of Conway E&S, Inc., a Pittsburgh-based independent insurance brokerage firm. Under the purchase agreement, the Corporation paid $464 in cash and recorded goodwill of $269 and other intangibles of $195 in connection with this acquisition. Insurance Brokerage – First Niagara Risk Management, Inc. On June 22, 2015, FNIA acquired the Pittsburgh Insurance Brokerage Segment of First Niagara Risk Management, Inc. Under the purchase agreement, the Corporation paid $3,066 in cash and recorded goodwill of $1,639, other intangibles of $1,186, and miscellaneous other assets of $241 in connection with this acquisition. OBA Financial Services, Inc. On September 19, 2014, the Corporation completed its acquisition of OBA Financial Services, Inc. (OBA), a bank holding company based in Germantown, Maryland. On the acquisition date, the estimated fair values of OBA included $390,160 in assets, $291,393 in loans and $295,922 in deposits. The acquisition was valued at $85,554 and resulted in the Corporation issuing 7,170,037 shares of its common stock in exchange for 4,025,895 shares of OBA common stock. The Corporation also acquired the outstanding stock options of OBA that became fully vested upon the acquisition. The assets and liabilities of OBA were recorded on the Corporation’s consolidated balance sheet at their fair values as of September 19, 2014, the acquisition date, and OBA’s results of operations have been included in the Corporation’s consolidated statement of comprehensive income since that date. OBA’s banking affiliate, OBA Bank, was merged into FNBPA on September 19, 2014. Based on the purchase price allocation, the Corporation recorded $20,107 in goodwill and $4,304 in core deposit intangibles as a result of the acquisition. None of the goodwill is deductible for income tax purposes. BCSB Bancorp, Inc. On February 15, 2014, the Corporation completed its acquisition of BCSB Bancorp, Inc. (BCSB), a bank holding company based in Baltimore, Maryland. On the acquisition date, the estimated fair values of BCSB included $596,122 in assets, $304,932 in loans and $532,197 in deposits. The acquisition was valued at $80,547 and resulted in the Corporation issuing 6,730,597 shares of its common stock in exchange for 3,235,961 shares of BCSB common stock. The Corporation also acquired the outstanding stock options of BCSB that became fully vested upon the acquisition. The assets and liabilities of BCSB were recorded on the Corporation’s consolidated balance sheet at their fair values as of February 15, 2014, the acquisition date, and BCSB’s results of operations have been included in the Corporation’s consolidated statement of comprehensive income since that date. BCSB’s banking affiliate, Baltimore County Savings Bank, was merged into FNBPA on February 15, 2014. Based on the purchase price allocation, the Corporation recorded $42,452 in goodwill and $6,591 in core deposit intangibles as a result of the acquisition. None of the goodwill is deductible for income tax purposes. PVF Capital Corp. On October 12, 2013, the Corporation completed its acquisition of PVF Capital Corp. (PVF), a savings and loan holding company based in Solon, Ohio. On the acquisition date, the estimated fair values of PVF included $737,229 in assets, $512,795 in loans and $628,019 in deposits. The acquisition was valued at $109,856 and resulted in the Corporation issuing 8,893,598 shares of its common stock in exchange for 26,119,398 shares of PVF common stock. The Corporation also acquired the outstanding stock options of PVF that became fully vested upon the acquisition. The assets and liabilities of PVF were recorded on the Corporation’s consolidated balance sheets at their fair values as of October 12, 2013, the acquisition date, and PVF’s results of operations have been included in the Corporation’s consolidated statements of comprehensive income since that date. PVF’s banking affiliate, Park View Federal Savings Bank, was merged into FNBPA on October 12, 2013. Based on the purchase price allocation, the Corporation recorded $55,727 in goodwill and $6,867 in core deposit intangibles as a result of the acquisition. None of the goodwill is deductible for income tax purposes. Annapolis Bancorp, Inc. On April 6, 2013, the Corporation completed its acquisition of Annapolis Bancorp, Inc. (ANNB), a bank holding company based in Annapolis, Maryland. On the acquisition date, the estimated fair values of ANNB included $430,252 in assets, $256,212 in loans and $349,370 in deposits. The acquisition was valued at $56,300 and resulted in the Corporation issuing 4,641,412 shares of its common stock in exchange for 4,060,802 shares of ANNB common stock. The Corporation also acquired the outstanding stock options of ANNB that became fully vested upon the acquisition. Additionally, the Corporation paid $609, or $0.15 per share, to the holders of ANNB common stock as cash consideration due to the collection of a certain loan, as designated in the merger agreement. The assets and liabilities of ANNB were recorded on the Corporation’s consolidated balance sheets at their fair values as of April 6, 2013, the acquisition date, and ANNB’s results of operations have been included in the Corporation’s consolidated statements of comprehensive income since that date. ANNB’s banking affiliate, BankAnnapolis, was merged into FNBPA on April 6, 2013. In conjunction with the acquisition, a warrant issued by ANNB to the U.S. Department of the Treasury (UST) under the Capital Purchase Program (CPP) was assumed by the Corporation and converted into a warrant to purchase up to 342,564 shares of the Corporation’s common stock. The warrant expires January 30, 2019 and has an exercise price of $3.57 per share. Subsequent adjustments related to actual dividends paid by the Corporation have increased the share amount of these warrants to 364,843, with a resulting lower exercise price of $3.38 per share as of December 31, 2015. Based on the purchase price allocation, the Corporation recorded $35,854 in goodwill and $3,775 in core deposit intangibles as a result of the acquisition. None of the goodwill is deductible for income tax purposes. The following table summarizes the amounts recorded on the consolidated balance sheet as of each of the acquisition dates in conjunction with the acquisitions noted above: Bank of America Branches OBA BCSB Bancorp, Inc. PVF Capital Corp. Annapolis Bancorp, Fair value of consideration paid: Common stock issued, net of offering costs $ — $ 85,554 $ 80,547 $ 109,856 $ 54,065 Warrant assumed — — — — 2,235 Total consideration paid — 85,554 80,547 109,856 56,300 Fair value of identifiable assets acquired: Cash and cash equivalents 148,159 32,913 26,980 99,738 41,986 Securities — 39,891 208,538 47,258 99,309 Loans 842 291,393 304,932 512,795 256,212 Other intangible assets 3,000 4,304 6,591 15,288 3,775 Other assets 1,133 21,659 49,081 62,150 28,970 Total identifiable assets acquired 153,134 390,160 596,122 737,229 430,252 Fair value of liabilities assumed: Deposits 154,619 295,922 532,197 628,019 349,370 Borrowings — 27,602 17,011 37,241 58,204 Other liabilities — 1,189 8,819 17,840 2,232 Total liabilities assumed 154,619 324,713 558,027 683,100 409,806 Fair value of net identifiable assets acquired (1,485 ) 65,447 38,095 54,129 20,446 Goodwill recognized $ 1,485 $ 20,107 $ 42,452 $ 55,727 $ 35,854 Pending Branch Purchase – Fifth Third Bank On September 3, 2015, the Corporation announced that it entered into a purchase and assumption agreement to acquire approximately $383,000 in retail and private banking deposits, 17 branch-banking locations and related consumer loans in the Pittsburgh, Pennsylvania area from Fifth Third Bank. The transaction is expected to close during the second quarter of 2016.

Securities

Securities	12 Months Ended
	Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Securities	4. Securities The amortized cost and fair value of securities are as follows: Amortized Cost Gross Gross Fair Securities Available for Sale: December 31, 2015 U.S. Treasury $ 29,738 $ 58 $ — $ 29,796 U.S. government-sponsored entities 368,463 856 (1,325 ) 367,994 Residential mortgage-backed securities: Agency mortgage-backed securities 703,069 4,594 (2,832 ) 704,831 Agency collateralized mortgage obligations 503,328 1,032 (8,530 ) 495,830 Non-agency collateralized mortgage obligations 1,177 13 — 1,190 Commercial mortgage-backed securities 4,299 — (12 ) 4,287 States of the U.S. and political subdivisions 10,748 309 — 11,057 Other debt securities 14,729 208 (651 ) 14,286 Total debt securities 1,635,551 7,070 (13,350 ) 1,629,271 Equity securities 975 324 (3 ) 1,296 $ 1,636,526 $ 7,394 $ (13,353 ) $ 1,630,567 December 31, 2014 U.S. Treasury $ 29,604 $ 78 $ — $ 29,682 U.S. government-sponsored entities 338,330 742 (1,939 ) 337,133 Residential mortgage-backed securities: Agency mortgage-backed securities 546,572 7,548 (35 ) 554,085 Agency collateralized mortgage obligations 580,601 1,617 (9,047 ) 573,171 Non-agency collateralized mortgage obligations 1,414 17 — 1,431 Commercial mortgage-backed securities 7,891 — (11 ) 7,880 States of the U.S. and political subdivisions 12,713 477 (32 ) 13,158 Other debt securities 16,615 420 (857 ) 16,178 Total debt securities 1,533,740 10,899 (11,921 ) 1,532,718 Equity securities 1,031 316 — 1,347 $ 1,534,771 $ 11,215 $ (11,921 ) $ 1,534,065 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 Amortized Cost Gross Gross Fair Securities Held to Maturity: December 31, 2015 U.S. Treasury $ 500 $ 153 $ — $ 653 U.S. government-sponsored entities 137,385 809 (395 ) 137,799 Residential mortgage-backed securities: Agency mortgage-backed securities 709,970 9,858 (1,176 ) 718,652 Agency collateralized mortgage obligations 499,694 803 (7,657 ) 492,840 Non-agency collateralized mortgage obligations 2,681 14 — 2,695 Commercial mortgage-backed securities 51,258 115 (259 ) 51,114 States of the U.S. and political subdivisions 235,573 4,191 (101 ) 239,663 $ 1,637,061 $ 15,943 $ (9,588 ) $ 1,643,416 December 31, 2014 U.S. Treasury $ 502 $ 168 $ — $ 670 U.S. government-sponsored entities 101,602 885 (524 ) 101,963 Residential mortgage-backed securities: Agency mortgage-backed securities 677,169 16,712 (346 ) 693,535 Agency collateralized mortgage obligations 501,965 1,858 (7,329 ) 496,494 Non-agency collateralized mortgage obligations 4,285 28 — 4,313 Commercial mortgage-backed securities 17,560 179 — 17,739 States of the U.S. and political subdivisions 150,272 3,315 (43 ) 153,544 $ 1,453,355 $ 23,145 $ (8,242 ) $ 1,468,258 December 31, 2013 U.S. Treasury $ 503 $ 99 $ — $ 602 U.S. government-sponsored entities 43,322 180 (1,151 ) 42,351 Residential mortgage-backed securities: Agency mortgage-backed securities 628,681 12,281 (6,032 ) 634,930 Agency collateralized mortgage obligations 385,408 764 (15,844 ) 370,328 Non-agency collateralized mortgage obligations 6,852 44 (4 ) 6,892 Commercial mortgage-backed securities 2,241 124 (37 ) 2,328 States of the U.S. and political subdivisions 132,162 1,992 (2,022 ) 132,132 $ 1,199,169 $ 15,484 $ (25,090 ) $ 1,189,563 Gross gains and gross losses were realized on securities as follows: Year Ended December 31 2015 2014 2013 Gross gains $ 831 $ 20,241 $ 1,200 Gross losses (9 ) (8,524 ) (392 ) $ 822 $ 11,717 $ 808 During 2014, the Corporation strategically sold its entire portfolio of pooled trust preferred securities (TPS) with net proceeds of $51,540 and a gain of $13,766. These were previously classified as collateralized debt obligations (CDOs) available for sale. Of the 23 pooled securities sold, one was determined to be a disallowed investment under the Volcker Rule (Section 619) of the Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010 (Dodd-Frank Act), and as such, was required to be disposed of by July 2016. Partially offsetting this gain was a net loss of $2,049 relating to the sale of other securities. By selling these securities, the Corporation strengthened the risk profile of its investment portfolio, improved its capital levels due to lowered risk-weighted assets and generated capital to support future growth. As of December 31, 2015, the amortized cost and fair value of securities, by contractual maturities, were as follows: Available for Sale Held to Maturity Amortized Fair Value Amortized Fair Value Due in one year or less $ 5,178 $ 5,183 $ 2,409 $ 2,426 Due from one to five years 403,591 403,401 136,744 136,841 Due from five to ten years 10,013 10,304 64,954 66,347 Due after ten years 4,896 4,245 169,351 172,501 423,678 423,133 373,458 378,115 Residential mortgage-backed securities: Agency mortgage-backed securities 703,069 704,831 709,970 718,652 Agency collateralized mortgage obligations 503,328 495,830 499,694 492,840 Non-agency collateralized mortgage obligations 1,177 1,190 2,681 2,695 Commercial mortgage-backed securities 4,299 4,287 51,258 51,114 Equity securities 975 1,296 — — $ 1,636,526 $ 1,630,567 $ 1,637,061 $ 1,643,416 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, 2015 and 2014, securities with a carrying value of $1,728,939 and $1,036,380, respectively, were pledged to secure public deposits, trust deposits and for other purposes as required by law. Securities with a carrying value of $272,629 and $892,647 at December 31, 2015 and 2014, 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 Losses # Fair Unrealized # Fair Unrealized Securities Available for Sale: December 31, 2015 U.S. government-sponsored entities 6 $ 99,131 $ (814 ) 2 $ 34,487 $ (511 ) 8 $ 133,618 $ (1,325 ) Residential mortgage-backed securities: Agency mortgage-backed securities 19 359,250 (2,832 ) — — — 19 359,250 (2,832 ) Agency collateralized mortgage obligations 9 126,309 (1,366 ) 18 215,330 (7,164 ) 27 341,639 (8,530 ) Commercial mortgage-backed securities 1 4,287 (12 ) — — — 1 4,287 (12 ) Other debt securities — — — 3 4,245 (651 ) 3 4,245 (651 ) Equity securities 1 632 (3 ) — — — 1 632 (3 ) 36 $ 589,609 $ (5,027 ) 23 $ 254,062 $ (8,326 ) 59 $ 843,671 $ (13,353 ) December 31, 2014 U.S. government-sponsored entities 7 $ 89,986 $ (275 ) 7 $ 99,326 $ (1,664 ) 14 $ 189,312 $ (1,939 ) Residential mortgage-backed securities: Agency mortgage-backed securities 2 45,145 (35 ) — — — 2 45,145 (35 ) Agency collateralized mortgage obligations 9 166,908 (1,238 ) 16 225,700 (7,809 ) 25 392,608 (9,047 ) Commercial mortgage-backed securities 1 7,880 (11 ) — — — 1 7,880 (11 ) States of the U.S. and political subdivisions — — — 1 1,159 (32 ) 1 1,159 (32 ) Other debt securities — — — 4 6,030 (857 ) 4 6,030 (857 ) 19 $ 309,919 $ (1,559 ) 28 $ 332,215 $ (10,362 ) 47 $ 642,134 $ (11,921 ) Securities Held to Maturity: December 31, 2015 U.S. government-sponsored entities 3 $ 39,843 $ (173 ) 1 $ 14,778 $ (222 ) 4 $ 54,621 $ (395 ) Residential mortgage-backed securities: Agency mortgage-backed securities 17 212,024 (1,159 ) 1 917 (17 ) 18 212,941 (1,176 ) Agency collateralized mortgage obligations 11 150,593 (1,434 ) 14 160,716 (6,223 ) 25 311,309 (7,657 ) Commercial mortgage-backed securities 3 46,278 (259 ) — — — 3 46,278 (259 ) States of the U.S. and political subdivisions 9 17,616 (101 ) — — — 9 17,616 (101 ) 43 $ 466,354 $ (3,126 ) 16 $ 176,411 $ (6,462 ) 59 $ 642,765 $ (9,588 ) December 31, 2014 U.S. government-sponsored entities 2 $ 24,989 $ (40 ) 2 $ 29,516 $ (484 ) 4 $ 54,505 $ (524 ) Residential mortgage-backed securities: Agency mortgage-backed securities 1 1,099 (1 ) 4 45,042 (345 ) 5 46,141 (346 ) Agency collateralized mortgage obligations 8 104,071 (630 ) 14 189,642 (6,699 ) 22 293,713 (7,329 ) States of the U.S. and political subdivisions 1 1,427 (4 ) 4 5,453 (39 ) 5 6,880 (43 ) 12 $ 131,586 $ (675 ) 24 $ 269,653 $ (7,567 ) 36 $ 401,239 $ (8,242 ) 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 portfolio of TPS consists of three single-issuer securities, which are primarily from money-center and large regional banks and are included in other debt securities. These single-issuer TPS had an amortized cost and estimated fair value of $4,896 and $4,245 at December 31, 2015, respectively. The Corporation has concluded from its analysis performed at December 31, 2015 that it is probable that the Corporation will collect all contractual principal and interest payments related to these securities. Other-Than-Temporary Impairment The Corporation evaluates its investment securities portfolio for OTTI on a quarterly basis. Impairment is assessed at the individual security level. The Corporation considers an investment security impaired if the fair value of the security is less than its cost or amortized cost basis. The following table presents a summary of the cumulative credit-related OTTI charges recognized as components of earnings for securities for which a portion of an OTTI is recognized in other comprehensive income: Collateralized Debt Obligations Equities Total For the Year Ended December 31, 2015 Beginning balance $ — $ 27 $ 27 Loss where impairment was not previously recognized — — — Additional loss where impairment was previously recognized — — — Reduction due to credit impaired securities sold — — — Ending balance $ — $ 27 $ 27 For the Year Ended December 31, 2014 Beginning balance $ 17,155 $ 27 $ 17,182 Loss where impairment was not previously recognized — — — Additional loss where impairment was previously recognized — — — Reduction due to credit impaired securities sold (17,155 ) — (17,155 ) Ending balance $ — $ 27 $ 27 The Corporation did not recognize any impairment losses on securities for the years ended December 31, 2015 and 2014. The Corporation recognized a net impairment loss of $27 for 2013, due to the write-down of securities that the Corporation deemed to be other-than-temporarily impaired. States of the U.S. and Political Subdivisions The Corporation’s municipal bond portfolio of $246,630 as of December 31, 2015 is highly rated with an average entity-specific rating of AA and 99.0% of the portfolio rated A or better. General obligation bonds comprise 99.8% of the portfolio. Geographically, municipal bonds support the Corporation’s primary footprint as 93.8% of the securities are from municipalities located throughout Pennsylvania, Ohio and Maryland. The average holding size of the securities in the municipal bond portfolio is $1,561. In addition to the strong stand-alone ratings, 81.0% of the municipalities have some formal credit enhancement insurance that strengthens the creditworthiness of their issue. Management also reviews the credit profile of each issuer on a quarterly basis.

Federal Home Loan Bank Stock

Federal Home Loan Bank Stock	12 Months Ended
	Dec. 31, 2015
Banking and Thrift [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, 2015 and 2014, the Corporation’s FHLB stock totaled $72,890 and $54,751, 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 a special dividend during the first quarter of 2015 and quarterly cash dividends in 2014 and 2015, 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 Leases

Loans and Leases	12 Months Ended
	Dec. 31, 2015
Receivables [Abstract]
Loans and Leases	6. Loans and Leases Following is a summary of loans and leases, net of unearned income: Originated Loans and Acquired Total Loans and December 31, 2015 Commercial real estate $ 3,531,146 $ 577,910 $ 4,109,056 Commercial and industrial 2,534,351 67,371 2,601,722 Commercial leases 204,553 — 204,553 Total commercial loans and leases 6,270,050 645,281 6,915,331 Direct installment 1,660,717 45,919 1,706,636 Residential mortgages 1,044,689 351,282 1,395,971 Indirect installment 996,175 554 996,729 Consumer lines of credit 1,021,830 115,425 1,137,255 Other 38,518 — 38,518 $ 11,031,979 $ 1,158,461 $ 12,190,440 December 31, 2014 Commercial real estate $ 3,031,810 $ 783,898 $ 3,815,708 Commercial and industrial 2,197,793 120,222 2,318,015 Commercial leases 177,824 — 177,824 Total commercial loans and leases 5,407,427 904,120 6,311,547 Direct installment 1,579,770 64,851 1,644,621 Residential mortgages 817,586 445,467 1,263,053 Indirect installment 873,645 1,906 875,551 Consumer lines of credit 946,427 164,549 1,110,976 Other 41,290 — 41,290 $ 9,666,145 $ 1,580,893 $ 11,247,038 Commercial real estate includes both owner-occupied and non-owner-occupied loans secured by commercial properties. Commercial and industrial includes loans to businesses that are not secured by real estate. Commercial leases are made for new or used equipment. Direct installment is comprised of fixed-rate, closed-end consumer loans for personal, family or household use, such as home equity loans and automobile loans. Residential mortgages consist of conventional and jumbo mortgage loans for non-commercial properties. Indirect installment is comprised of loans originated by third parties and underwritten by the Corporation, primarily automobile loans. Consumer lines of credit include home equity lines of credit (HELOC) and consumer lines of credit that are either unsecured or secured by collateral other than home equity. Other is comprised primarily of credit cards, mezzanine loans and student loans. The loan portfolio consists principally of loans to individuals and small- and medium-sized businesses within the Corporation’s primary market area of Pennsylvania, eastern Ohio, Maryland and northern West Virginia. The total loan portfolio contains consumer finance loans to individuals in Pennsylvania, Ohio, Tennessee and Kentucky, which totaled $186,162 or 1.5% of total loans at December 31, 2015, compared to $180,588 or 1.6% of total loans at December 31, 2014. Due to the relative size of the consumer finance loan portfolio, they are not segregated from other consumer loans. As of December 31, 2015, 38.1% of the commercial real estate loans were owner-occupied, while the remaining 61.9% were non-owner-occupied, compared to 41.6% and 58.4%, respectively, as of December 31, 2014. As of December 31, 2015 and 2014, the Corporation had commercial construction loans of $352,322 and $296,156, respectively, representing 2.9% and 2.6% of total loans at those respective dates. As of December 31, 2015 and 2014, 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, 2014 $ 42,263 New loans 4,954 Repayments (3,802 ) Other (1,614 ) Total loans at December 31, 2015 $ 41,801 Other represents the net change in loan balances resulting from changes in related parties during 2015. Acquired Loans All acquired loans were initially recorded at fair value at the acquisition date. The outstanding balance and the carrying amount of acquired loans included in the consolidated balance sheet are as follows: 2015 2014 December 31 Accounted for under ASC 310-30: Outstanding balance $ 1,258,418 $ 1,597,558 Carrying amount 1,011,139 1,344,171 Accounted for under ASC 310-20: Outstanding balance 146,161 242,488 Carrying amount 140,595 228,748 Total acquired loans: Outstanding balance 1,404,579 1,840,046 Carrying amount 1,151,734 1,572,919 The carrying amount of purchased credit impaired loans included in the table above totaled $5,940 at December 31, 2015 and $9,556 at December 31, 2014, representing less than 1% of the carrying amount of total acquired loans as of each date. The following table provides changes in accretable yield for all acquired loans accounted for under ASC 310-30. Loans accounted for under ASC 310-20 are not included in this table. Year Ended December 31 2015 2014 Balance at beginning of period $ 331,899 $ 305,646 Acquisitions — 125,001 Reduction due to unexpected early payoffs (47,075 ) (48,556 ) Reclass from non-accretable difference 32,141 29,643 Disposals/transfers (674 ) (5,513 ) Accretion (60,171 ) (74,322 ) Balance at end of period $ 256,120 $ 331,899 Credit Quality Management monitors the credit quality of the Corporation’s loan portfolio on an ongoing basis. Measurement of delinquency and past due status are based on the contractual terms of each loan. Non-performing loans include non-accrual loans and non-performing troubled debt restructurings (TDRs). Past due loans are reviewed on a monthly basis to identify loans for non-accrual status. The Corporation places a loan on non-accrual status and discontinues interest accruals on originated loans generally when principal or interest is due and has remained unpaid for a certain number of days unless the loan is both well secured and in the process of collection. Commercial loans are placed on non-accrual at 90 days, installment loans are placed on non-accrual at 120 days and residential mortgages and consumer lines of credit are generally placed on non-accrual at 180 days. When a loan is placed on non-accrual status, all unpaid accrued 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. Following is a summary of non-performing assets: December 31 2015 2014 Non-accrual loans $ 49,897 $ 45,113 Troubled debt restructurings 22,028 23,439 Total non-performing loans 71,925 68,552 Other real estate owned (OREO) 38,918 41,466 Total non-performing assets $ 110,843 $ 110,018 Asset quality ratios: Non-performing loans as a percent of total loans and leases 0.59 % 0.61 % Non-performing loans + OREO as a percent of total loans and leases + OREO 0.91 % 0.97 % Non-performing assets as a percent of total assets 0.63 % 0.68 % The carrying value of residential OREO held as a result of obtaining physical possession upon completion of a foreclosure or through completion of a deed in lieu of foreclosure amounted to $5,219 at December 31, 2015. Also, the recorded investment of consumer mortgage loans secured by residential real estate properties for which formal foreclosure proceedings are in process at December 31, 2015 amounted to $11,725. The following tables provide an analysis of the aging of loans by class segregated by loans and leases originated and loans acquired: 30-89 Days Past Due ³ 90 Days Still Accruing Non- Accrual Total Past Due Current Total Loans and Originated Loans and Leases December 31, 2015 Commercial real estate $ 11,006 $ 1 $ 23,503 $ 34,510 $ 3,496,636 $ 3,531,146 Commercial and industrial 5,409 3 14,382 19,794 2,514,557 2,534,351 Commercial leases 924 — 659 1,583 202,970 204,553 Total commercial loans and leases 17,339 4 38,544 55,887 6,214,163 6,270,050 Direct installment 9,254 3,813 4,806 17,873 1,642,844 1,660,717 Residential mortgages 8,135 1,470 2,882 12,487 1,032,202 1,044,689 Indirect installment 9,472 379 1,361 11,212 984,963 996,175 Consumer lines of credit 2,410 1,189 1,181 4,780 1,017,050 1,021,830 Other 73 169 — 242 38,276 38,518 $ 46,683 $ 7,024 $ 48,774 $ 102,481 $ 10,929,498 $ 11,031,979 December 31, 2014 Commercial real estate $ 9,601 $ 313 $ 24,132 $ 34,046 $ 2,997,764 $ 3,031,810 Commercial and industrial 2,446 3 8,310 10,759 2,187,034 2,197,793 Commercial leases 961 43 722 1,726 176,098 177,824 Total commercial loans and leases 13,008 359 33,164 46,531 5,360,896 5,407,427 Direct installment 9,333 3,617 7,117 20,067 1,559,703 1,579,770 Residential mortgages 8,709 3,891 2,964 15,564 802,022 817,586 Indirect installment 7,804 684 1,149 9,637 864,008 873,645 Consumer lines of credit 2,408 562 719 3,689 942,738 946,427 Other 13 135 — 148 41,142 41,290 $ 41,275 $ 9,248 $ 45,113 $ 95,636 $ 9,570,509 $ 9,666,145 30-89 Days Past Due ³ 90 Days Non- Total Past Due (1)(2) Current Discount Total Loans Acquired Loans December 31, 2015 Commercial real estate $ 6,399 $ 12,752 $ 931 $ 20,082 $ 593,128 $ (35,300 ) $ 577,910 Commercial and industrial 1,065 616 103 1,784 72,037 (6,450 ) 67,371 Total commercial loans 7,464 13,368 1,034 21,866 665,165 (41,750 ) 645,281 Direct installment 837 659 — 1,496 43,596 827 45,919 Residential mortgages 5,871 15,136 — 21,007 366,742 (36,467 ) 351,282 Indirect installment 32 9 — 41 571 (58 ) 554 Consumer lines of credit 830 546 89 1,465 117,443 (3,483 ) 115,425 $ 15,034 $ 29,718 $ 1,123 $ 45,875 $ 1,193,517 $ (80,931 ) $ 1,158,461 December 31, 2014 Commercial real estate $ 12,076 $ 12,368 — $ 24,444 $ 799,991 $ (40,537 ) $ 783,898 Commercial and industrial 687 1,968 — 2,655 127,535 (9,968 ) 120,222 Total commercial loans 12,763 14,336 — 27,099 927,526 (50,505 ) 904,120 Direct installment 2,670 1,443 — 4,113 59,532 1,206 64,851 Residential mortgages 8,159 19,936 — 28,095 456,810 (39,438 ) 445,467 Indirect installment 38 30 — 68 2,179 (341 ) 1,906 Consumer lines of credit 1,048 2,279 — 3,327 166,912 (5,690 ) 164,549 $ 24,678 $ 38,024 — $ 62,702 $ 1,612,959 $ (94,768 ) $ 1,580,893 (1) Past due information for loans acquired is based on the contractual balance outstanding at December 31, 2015 and 2014. (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. In these instances, 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. Acquired loans are considered non-accrual or non-performing when, due to credit deterioration or other factors, the Corporation determines it is no longer able to reasonably estimate the timing and amount of expected cash flows on such loans. The Corporation does not recognize interest income on acquired loans considered non-accrual or non-performing. The Corporation utilizes the following categories to monitor credit quality within its commercial loan and lease portfolio: Rating Definition Pass in general, the condition of the borrower and the performance of the loan is satisfactory or better Special Mention in general, the condition of the borrower has deteriorated, requiring an increased level of monitoring Substandard in general, the condition of the borrower has significantly deteriorated and the performance of the loan could further deteriorate if deficiencies are not corrected Doubtful in general, the condition of the borrower has significantly deteriorated and the collection in full of both principal and interest is highly questionable or improbable The use of these internally assigned credit quality categories within the commercial loan portfolio permits management’s use of transition matrices to estimate a quantitative portion of credit risk. The Corporation’s internal credit risk grading system is based on past experiences with similarly graded loans and conforms with regulatory categories. In general, loan risk ratings within each category are reviewed on an ongoing basis according to the Corporation’s policy for each class of loans. Each quarter, management analyzes the resulting ratings, as well as other external statistics and factors such as delinquency, to track the migration performance of the commercial loan portfolio. Loans within the Pass credit category or that migrate toward the Pass credit category generally have a lower risk of loss compared to loans that migrate toward the Substandard or Doubtful credit categories. Accordingly, management applies higher risk factors to Substandard and Doubtful credit categories. The following tables present a summary of the Corporation’s commercial loans by credit quality category segregated by loans and leases originated and loans acquired: Commercial Loan and Lease Credit Quality Categories Pass Special Substandard Doubtful Total Originated Loans and Leases December 31, 2015 Commercial real estate $ 3,416,527 $ 52,887 $ 61,411 $ 321 $ 3,531,146 Commercial and industrial 2,335,103 109,539 87,380 2,329 2,534,351 Commercial leases 198,207 2,447 3,899 — 204,553 $ 5,949,837 $ 164,873 $ 152,690 $ 2,650 $ 6,270,050 December 31, 2014 Commercial real estate $ 2,890,830 $ 58,630 $ 81,951 $ 399 $ 3,031,810 Commercial and industrial 2,085,893 71,420 39,684 796 2,197,793 Commercial leases 174,677 2,198 949 — 177,824 $ 5,151,400 $ 132,248 $ 122,584 $ 1,195 $ 5,407,427 Acquired Loans December 31, 2015 Commercial real estate $ 464,162 $ 47,619 $ 66,129 — $ 577,910 Commercial and industrial 56,446 3,182 7,743 — 67,371 $ 520,608 $ 50,801 $ 73,872 — $ 645,281 December 31, 2014 Commercial real estate $ 610,260 $ 73,891 $ 99,747 — $ 783,898 Commercial and industrial 103,862 3,506 12,854 — 120,222 $ 714,122 $ 77,397 $ 112,601 — $ 904,120 Credit quality information for acquired loans is based on the contractual balance outstanding at December 31, 2015 and 2014. The Corporation uses delinquency transition matrices within the consumer and other loan classes to enable management to estimate a quantitative portion of credit risk. Each month, management analyzes payment and volume activity, FICO scores and other external factors such as unemployment, to determine how consumer loans are performing. Following is a table showing originated consumer and other loans by payment status: Consumer Loan Credit Quality by Payment Status Performing Non-Performing Total December 31, 2015 Direct installment $ 1,646,925 $ 13,792 $ 1,660,717 Residential mortgages 1,031,926 12,763 1,044,689 Indirect installment 994,661 1,514 996,175 Consumer lines of credit 1,019,783 2,047 1,021,830 Other 38,518 — 38,518 December 31, 2014 Direct installment $ 1,565,090 $ 14,680 $ 1,579,770 Residential mortgages 802,522 15,064 817,586 Indirect installment 872,340 1,305 873,645 Consumer lines of credit 944,631 1,796 946,427 Other 41,290 — 41,290 Loans and leases 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 and lease contract is doubtful. Typically, the Corporation does not consider loans and leases for impairment unless a sustained period of delinquency (i.e., 90-plus days) is noted or there are subsequent events that impact repayment probability (i.e., negative financial trends, bankruptcy filings, imminent foreclosure proceedings, etc.). Impairment is evaluated in the aggregate for consumer installment loans, residential mortgages, consumer lines of credit and commercial loan relationships less than $500 based on loan segment loss given default. For commercial loan relationships greater than or equal to $500, a specific valuation allowance is allocated, if necessary, so that the loan is reported net, at the present value of estimated future cash flows using a market interest rate or at the fair value of collateral if repayment is expected solely from the collateral. Consistent with the Corporation’s existing method of income recognition for loans, interest on impaired loans, except those classified as non-accrual, is recognized as income using the accrual method. Impaired loans, or portions thereof, are charged off when deemed uncollectible. Following is a summary of information pertaining to originated loans and leases considered to be impaired, by class of loan and lease: Unpaid Principal Balance Recorded Investment Reserve Recorded Investment Specific Reserve Total Recorded Investment Specific Average Recorded Investment At or for the Year Ended December 31, 2015 Commercial real estate $ 33,780 $ 24,423 $ 772 $ 25,195 $ 321 $ 26,143 Commercial and industrial 15,860 9,176 5,543 14,719 2,329 12,298 Commercial leases 659 659 — 659 — 747 Total commercial loans and leases 50,299 34,258 6,315 40,573 2,650 39,188 Direct installment 14,679 13,792 — 13,792 — 13,267 Residential mortgages 13,394 12,763 — 12,763 — 12,896 Indirect installment 3,745 1,514 — 1,514 — 1,401 Consumer lines of credit 2,408 2,047 — 2,047 — 2,198 $ 84,525 $ 64,374 $ 6,315 $ 70,689 $ 2,650 $ 68,950 At or for the Year Ended December 31, 2014 Commercial real estate $ 34,583 $ 25,443 $ 883 $ 26,326 $ 399 $ 30,807 Commercial and industrial 11,412 7,609 1,948 9,557 780 9,510 Commercial leases 722 722 — 722 — 686 Total commercial loans and leases 46,717 33,774 2,831 36,605 1,179 41,003 Direct installment 14,987 14,680 — 14,680 — 14,248 Residential mortgages 16,791 15,064 — 15,064 — 16,924 Indirect installment 1,467 1,305 — 1,305 — 1,399 Consumer lines of credit 1,803 1,796 — 1,796 — 1,793 $ 81,765 $ 66,619 $ 2,831 $ 69,450 $ 1,179 $ 75,367 Interest income is generally no longer recognized once a loan becomes impaired. These tables do not reflect the additional allowance for credit losses relating to acquired loans in the following pools and categories: commercial real estate of $3,073; commercial and industrial of $695; direct installment of $1,557; residential mortgages of $659; indirect installment of $221; and consumer lines of credit of $522, totaling $6,727 at December 31, 2015 and commercial real estate of $3,286; commercial and industrial of $1,484; direct installment of $1,847; residential mortgages of $858; indirect installment of $232; and consumer lines of credit of $267, totaling $7,974 at December 31, 2014. 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 2015 2014 Accruing: Performing $ 15,165 $ 9,441 Non-performing 22,028 23,439 Non-accrual 8,307 8,272 $ 45,500 $ 41,152 TDRs that are accruing and performing include loans that met the criteria for non-accrual of interest prior to restructuring for which the Corporation can reasonably estimate the timing and amount of the expected cash flows on such loans and for which the Corporation expects to fully collect the new carrying value of the loans. During 2015, the Corporation returned to performing status $7,338 in restructured residential mortgage loans that have consistently met their modified obligations for more than six months. TDRs that are accruing and non-performing are comprised of consumer loans that have not demonstrated a consistent repayment pattern on the modified terms for more than six months, however it is expected that the Corporation will collect all future principal and interest payments. TDRs that are on non-accrual are not placed on accruing status until all delinquent principal and interest have been paid and the ultimate collectability of the remaining principal and interest is reasonably assured. Some loan modifications classified as TDRs may not ultimately result in the full collection of principal and interest, as modified, and may result in potential incremental losses which are factored into the allowance for credit 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 credit losses included specific reserves for commercial TDRs of $300 and $371 at December 31, 2015 and 2014, respectively, and pooled reserves for individual loans under $500 of $929 and $1,215 for those same respective periods, based on loan segment loss given default. Upon default, the amount of the recorded investment in the TDR in excess of the fair value of the collateral, less estimated selling costs, is generally considered a confirmed loss and is charged-off against the allowance for credit 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 credit losses included pooled reserves for these classes of loans of $3,515 and $3,448 at December 31, 2015 and 2014, 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 2015 2014 Number of Contracts Pre-Modification Recorded Investment Post- Outstanding Recorded Investment Number of Contracts Pre-Modification Recorded Investment Post- Outstanding Recorded Investment Commercial real estate 3 $ 1,165 $ 960 11 $ 2,946 $ 2,282 Commercial and industrial 1 5 4 4 573 540 Total commercial loans 4 1,170 964 15 3,519 2,822 Direct installment 489 6,712 6,314 522 5,742 5,422 Residential mortgages 45 1,667 1,660 46 2,456 2,357 Indirect installment 17 55 48 24 70 66 Consumer lines of credit 58 950 832 41 1,089 1,037 613 $ 10,554 $ 9,818 648 $ 12,876 $ 11,704 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 2015 2014 Number Contracts Recorded Investment (1) Number Contracts Recorded Investment (1) Commercial real estate 1 $ 26 — $ — Commercial and industrial — — — — Total commercial loans 1 26 — — Direct installment 97 510 97 728 Residential mortgages 7 306 4 151 Indirect installment 9 14 7 16 Consumer lines of credit — — 1 50 114 $ 856 109 $ 945 (1) The recorded investment is as of period end.

Allowance for Credit Losses

Allowance for Credit Losses	12 Months Ended
	Dec. 31, 2015
Receivables [Abstract]
Allowance for Credit Losses	7. Allowance for Credit Losses Following is a summary of changes in the allowance for credit losses, by loan and lease class: Balance at Beginning of Year Charge- Recoveries Net Provision Balance at End of Year Ended December 31, 2015 Commercial real estate $ 37,588 $ (4,443 ) $ 1,117 $ (3,326 ) $ 7,479 $ 41,741 Commercial and industrial 32,645 (3,562 ) 1,773 (1,789 ) 10,167 41,023 Commercial leases 2,398 (544 ) 101 (443 ) 586 2,541 Total commercial loans and leases 72,631 (8,549 ) 2,991 (5,558 ) 18,232 85,305 Direct installment 20,538 (10,844 ) 1,527 (9,317 ) 10,366 21,587 Residential mortgages 8,024 (1,010 ) 85 (925 ) 810 7,909 Indirect installment 7,504 (6,427 ) 1,190 (5,237 ) 7,622 9,889 Consumer lines of credit 8,496 (1,653 ) 175 (1,478 ) 2,564 9,582 Other 759 (1,691 ) 55 (1,636 ) 1,890 1,013 Total allowance on originated loans 117,952 (30,174 ) 6,023 (24,151 ) 41,484 135,285 Purchased credit-impaired loans 660 (64 ) 19 (45 ) 219 834 Other acquired loans 7,314 (830 ) 671 (159 ) (1,262 ) 5,893 Total allowance on acquired loans 7,974 (894 ) 690 (204 ) (1,043 ) 6,727 Total allowance $ 125,926 $ (31,068 ) $ 6,713 $ (24,355 ) $ 40,441 $ 142,012 Year Ended December 31, 2014 Commercial real estate $ 32,548 $ (6,568 ) $ 2,351 $ (4,217 ) $ 9,257 $ 37,588 Commercial and industrial 32,603 (3,454 ) 1,412 (2,042 ) 2,084 32,645 Commercial leases 1,903 (415 ) 105 (310 ) 805 2,398 Total commercial loans and leases 67,054 (10,437 ) 3,868 (6,569 ) 12,146 72,631 Direct installment 17,824 (9,600 ) 1,163 (8,437 ) 11,151 20,538 Residential mortgages 5,836 (760 ) 74 (686 ) 2,874 8,024 Indirect installment 6,409 (3,627 ) 875 (2,752 ) 3,847 7,504 Consumer lines of credit 7,231 (1,495 ) 218 (1,277 ) 2,542 8,496 Other 530 (1,329 ) 24 (1,305 ) 1,534 759 Total allowance on originated loans 104,884 (27,248 ) 6,222 (21,026 ) 34,094 117,952 Purchased credit-impaired loans 1,000 (2,614 ) 1 (2,613 ) 2,273 660 Other acquired loans 4,900 (873 ) 1,006 133 2,281 7,314 Total allowance on acquired loans 5,900 (3,487 ) 1,007 (2,480 ) 4,554 7,974 Total allowance $ 110,784 $ (30,735 ) $ 7,229 $ (23,506 ) $ 38,648 $ 125,926 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 Following is a summary of the individual and collective originated allowance for credit losses and corresponding originated loan and lease balances by class: Allowance Loans and Leases Outstanding Individually Evaluated for Impairment Collectively Evaluated for Impairment Originated Individually Evaluated for Impairment Collectively Evaluated for Impairment December 31, 2015 Commercial real estate $ 321 $ 41,420 $ 3,531,146 $ 12,904 $ 3,518,242 Commercial and industrial 2,329 38,694 2,534,351 10,802 2,523,549 Commercial leases — 2,541 204,553 — 204,553 Total commercial loans and leases 2,650 82,655 6,270,050 23,706 6,246,344 Direct installment — 21,587 1,660,717 — 1,660,717 Residential mortgages — 7,909 1,044,689 — 1,044,689 Indirect installment — 9,889 996,175 — 996,175 Consumer lines of credit — 9,582 1,021,830 — 1,021,830 Other — 1,013 38,518 — 38,518 $ 2,650 $ 132,635 $ 11,031,979 $ 23,706 $ 11,008,273 December 31, 2014 Commercial real estate $ 399 $ 37,189 $ 3,031,810 $ 13,952 $ 3,017,858 Commercial and industrial 780 31,865 2,197,793 5,837 2,191,956 Commercial leases — 2,398 177,824 — 177,824 Total commercial loans and leases 1,179 71,452 5,407,427 19,789 5,387,638 Direct installment — 20,538 1,579,770 — 1,579,770 Residential mortgages — 8,024 817,586 — 817,586 Indirect installment — 7,504 873,645 — 873,645 Consumer lines of credit — 8,496 946,427 — 946,427 Other — 759 41,290 — 41,290 $ 1,179 $ 116,773 $ 9,666,145 $ 19,789 $ 9,646,356 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, 2015
Property, Plant and Equipment [Abstract]
Premises and Equipment	8. Premises and Equipment Following is a summary of premises and equipment: December 31 2015 2014 Land $ 33,023 $ 35,473 Premises 143,757 150,868 Equipment 130,066 117,223 306,846 303,564 Accumulated depreciation (147,766 ) (134,808 ) $ 159,080 $ 168,756 Depreciation expense for premises and equipment was $20,009 for 2015, $18,671 for 2014 and $15,558 for 2013. The Corporation has operating leases extending to 2046 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 Total minimum rental commitments under such leases were $90,320 at December 31, 2015. Following is a summary of future minimum lease payments for years following December 31, 2015: 2016 $ 14,529 2017 13,373 2018 11,768 2019 9,637 2020 7,733 Later years 33,280

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	12 Months Ended
	Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	9. Goodwill and Other Intangible Assets The following table shows a rollforward of goodwill by line of business: Community Wealth Manage- Insurance Consumer Finance Total Balance at January 1, 2014 $ 745,469 $ 8,020 $ 8,950 $ 1,809 $ 764,248 Goodwill additions 67,965 — — — 67,965 Balance at December 31, 2014 813,434 8,020 8,950 1,809 832,213 Goodwill (deductions) additions (1,035 ) — 1,908 — 873 Balance at December 31, 2015 $ 812,399 $ 8,020 $ 10,858 $ 1,809 $ 833,086 The Corporation recorded goodwill during 2015 and 2014 as a result of the purchase accounting adjustments relating to the various acquisitions described in the “Mergers and Acquisitions” footnote in this Report. The following table shows a summary of core deposit intangibles, customer renewal lists and mortgage servicing rights: Core Customer Mortgage Servicing Rights Total Finite- December 31, 2015 Gross carrying amount $ 111,594 $ 12,351 $ 12,766 $ 136,711 Accumulated amortization (79,362 ) (7,860 ) (3,845 ) (91,067 ) $ 32,232 $ 4,491 $ 8,921 $ 45,644 December 31, 2014 Gross carrying amount $ 108,593 $ 10,970 $ 11,691 $ 131,254 Accumulated amortization (71,818 ) (7,099 ) (4,833 ) (83,750 ) $ 36,775 $ 3,871 $ 6,858 $ 47,504 Core deposit intangibles are being amortized primarily over 10 years using accelerated methods. Customer renewal lists and mortgage servicing rights are being amortized over their estimated useful lives, which range from eight to thirteen years. Amortization expense on finite-lived intangible assets totaled $10,555 for 2015, $12,310 for 2014 and $9,406 for 2013, of which $2,250, $2,593 and $999 related to mortgage servicing rights for 2015, 2014 and 2013, respectively. The amortization relating to mortgage servicing rights is included in mortgage banking operations within the non-interest income section on the Consolidated Income Statement, while the remaining amortization expense is reflected within the non-interest expense section. 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, 2015: 2016 $ 9,229 2017 8,011 2018 6,150 2019 5,312 2020 4,962 Goodwill and other intangible assets are reviewed annually for impairment, and more frequently if impairment indicators exist. The Corporation completed this review in 2015 and 2014 and determined that its intangible assets are not impaired.

Deposits

Deposits	12 Months Ended
	Dec. 31, 2015
Banking and Thrift [Abstract]
Deposits	10. Deposits Following is a summary of deposits: December 31 2015 2014 Non-interest-bearing demand $ 3,059,949 $ 2,647,623 Interest-bearing demand 5,311,589 4,547,628 Savings 1,786,459 1,575,922 Certificates and other time deposits 2,465,466 2,611,035 $ 12,623,463 $ 11,382,208 Time deposits of $250,000 or more were $213,805 and $228,810 at December 31, 2015 and 2014, respectively. Time deposits of $100,000 or more were $861,042 and $895,505 at December 31, 2015 and 2014, respectively. Following is a summary of the time deposits of $100,000 or more by remaining maturity at December 31, 2015: Certificates Other Total Three months or less $ 88,520 $ 7,973 $ 96,493 Three to six months 113,475 9,928 123,403 Six to twelve months 187,347 24,558 211,905 Over twelve months 311,127 118,114 429,241 $ 700,469 $ 160,573 $ 861,042 Following is a summary of the scheduled maturities of certificates and other time deposits for the years following December 31, 2015: 2016 $ 1,312,627 2017 439,392 2018 197,080 2019 213,622 2020 197,573 Later years 105,172

Short-Term Borrowings

Short-Term Borrowings	12 Months Ended
	Dec. 31, 2015
Debt Disclosure [Abstract]
Short-Term Borrowings	11. Short-Term Borrowings Following is a summary of short-term borrowings: December 31 2015 2014 Securities sold under repurchase agreements $ 266,732 $ 882,696 Federal Home Loan Bank advances 1,090,000 820,000 Federal funds purchased 568,000 210,000 Subordinated notes 124,164 128,962 $ 2,048,896 $ 2,041,658 Securities sold under repurchase agreements are 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 2015, 2014 and 2013 were 0.42%, 0.39% and 0.43%, respectively. The weighted average interest rates on short-term borrowings at December 31, 2015, 2014 and 2013 were 0.48%, 0.37% and 0.41%, respectively.

Long-Term Borrowings

Long-Term Borrowings	12 Months Ended
	Dec. 31, 2015
Debt Disclosure [Abstract]
Long-Term Borrowings	12. Long-Term Borrowings Following is a summary of long-term borrowings: December 31 2015 2014 Federal Home Loan Bank advances $ 400,017 $ 400,042 Subordinated notes 84,668 83,155 Junior subordinated debt 58,298 58,246 Other subordinated debt 98,497 — $ 641,480 $ 541,443 The Corporation’s banking affiliate has available credit with the FHLB of $4,541,637 of which $1,490,017 was used as of December 31, 2015. These advances are secured by loans collateralized by residential mortgages, HELOCs, commercial real estate and FHLB stock and are scheduled to mature in various amounts periodically through the year 2021. Effective interest rates paid on the long-term advances ranged from 0.76% to 4.19% for the years ended December 31, 2015 and 2014. Subordinated notes are unsecured and subordinated to other indebtedness of the Corporation. The subordinated notes mature in various amounts periodically through the year 2025. At December 31, 2015, all of the subordinated notes are 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 notes. The weighted average interest rate on the subordinated notes was 2.73% at December 31, 2015, 2.70% at December 31, 2014 and 2.77% at December 31, 2013. Junior subordinated debt is comprised of the debt securities issued by the Corporation in relation to its two unconsolidated subsidiary trusts (collectively, the Trusts): F.N.B. Statutory Trust II and Omega Financial Capital Trust I. One hundred percent of the common equity of each Trust is owned by the Corporation. The Trusts were formed for the purpose of issuing Corporation-obligated mandatorily redeemable capital securities (TPS) to third-party investors. The proceeds from the sale of TPS and the issuance of common equity by the Trusts were invested in junior subordinated debt securities issued by the Corporation, which are the sole assets of each Trust. Since third-party investors are the primary beneficiaries, the Trusts are not consolidated in the Corporation’s financial statements. The Trusts pay dividends on the TPS at the same rate as the distributions paid by the Corporation on the junior subordinated debt held by the Trusts. Omega Financial Capital Trust I was assumed as a result of an acquisition. Distributions on the junior 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 junior subordinated debt. The TPS are eligible for redemption, at any time, at the Corporation’s discretion. Under capital guidelines, effective January 1, 2015, the portion of the junior subordinated debt, net of the Corporation’s investments in the Trusts, that qualifies as tier 1 capital is limited to 25% of the total $57,500 outstanding at December 31, 2015, with the remaining 75% included in tier 2 capital. In 2016, the entire balance of the junior subordinated debt, net of the Corporation’s investments in the Trusts, will be included in tier 2 capital. 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 2014, the Corporation redeemed $33,000 of the Corporation-issued TPS, including $16,500 that the Corporation assumed as a result of the BCSB acquisition. During 2016, the Corporation redeemed $10,000 of the TPS issued by Omega Financial Capital Trust I. The following table provides information relating to the remaining Trusts as of December 31, 2015: Trust Preferred Securities Common Securities Junior Subordinated Debt Stated Maturity Date Interest Rate F.N.B. Statutory Trust II $ 21,500 $ 665 $ 22,165 6/15/36 2.16 % Variable; LIBOR + 165 basis points (bps) Omega Financial Capital Trust I 36,000 1,114 36,133 10/18/34 2.51 % Variable; LIBOR + 219 bps $ 57,500 $ 1,779 $ 58,298 Other subordinated debt is comprised of the $100,000 aggregate principal amount of 4.875% subordinated notes due in 2025 issued by the Corporation in its October 2015 debt offering. The net proceeds of the debt offering after deducting underwriting discounts and commissions and offering costs were $98,443. These subordinated notes are eligible for treatment as tier 2 capital for regulatory capital purposes. Scheduled annual maturities for all of the long-term debt for the years following December 31, 2015 are as follows: 2016 $ 155,736 2017 168,060 2018 42,758 2019 28,293 2020 43,929 Later years 202,704

Derivative Instruments

Derivative Instruments	12 Months Ended
	Dec. 31, 2015
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. Derivative instruments are used to reduce the effects that changes in interest rates may have on net income and cash flows. The Corporation also uses derivative instruments to facilitate transactions on behalf of its customers. All derivatives are carried on the consolidated balance sheet at fair value and do not take into account the effects of master netting arrangements the Corporation has with other financial institutions. Credit risk is included in the determination of the estimated fair value of derivatives. Derivative assets are classified in the consolidated balance sheet under other assets and derivative liabilities are classified in the consolidated balance sheet under other liabilities. Changes in fair value are recognized in earnings except for certain changes related to derivative instruments designated as part of a cash flow hedging relationship. The following table presents notional amounts and gross fair values of all derivative assets and derivative liabilities held by the Corporation: December 31 2015 2014 Notional Amount Fair Value Notional Amount Fair Value Asset Liability Asset Liability Gross Derivatives Subject to master netting arrangements: Interest rate contracts – designated $ 250,000 $ 3,178 $ 962 $ 200,000 $ 2,109 $ 2,330 Interest rate swaps – not designated 1,262,964 1 50,491 972,002 140 43,655 Equity contracts – not designated 1,180 18 — 1,210 47 — Total subject to master netting arrangements 1,514,144 3,197 51,453 1,173,212 2,296 45,985 Not subject to master netting arrangements: Interest rate swaps – not designated 1,262,964 49,998 1 972,002 43,602 128 Credit risk contracts – not designated 114,753 7 133 68,632 — — Equity contracts – not designated 1,180 — 18 1,210 — 47 Total not subject to master netting arrangements 1,378,897 50,005 152 1,041,844 43,602 175 $ 2,893,041 $ 53,202 $ 51,605 $ 2,215,056 $ 45,898 $ 46,160 Derivatives Designated as Hedging Instruments under GAAP Interest Rate Contracts. At December 31, 2015 and 2014, the notional amount of these interest rate derivative agreements totaled $250,000 and $200,000, respectively. Fair values included in other assets and other liabilities on the consolidated balance sheet applicable to these agreements amounted to $3,178 and $962, respectively, at December 31, 2015, and $2,109 and $2,330, respectively, at December 31, 2014. For the year ended December 31, 2015, the amount reclassified from AOCI to interest income and interest expense totaled $3,248 ($2,111 net of tax) and $292 ($189 net of tax), respectively. As of December 31, 2015, the maximum length of time over which forecasted interest cash flows are hedged is eight years. In the twelve months that follow December 31, 2015, the Corporation expects to reclassify from the amount currently reported in AOCI net derivative gains of 1,794 ($1,166 net of tax), in association with interest on the hedged loans and FHLB advance. This amount could differ from amounts actually recognized due to changes in interest rates, hedge de-designations, and the addition of other hedges subsequent to December 31, 2015. There were no components of derivative gains or losses excluded from the assessment of hedge effectiveness related to these cash flow hedges. For the years ended December 31, 2015 and 2014, there was no hedge ineffectiveness. Also, during the years ended December 31, 2015 and 2014, there were no gains or losses from cash flow hedge derivatives reclassified to earnings because it became probable that the original forecasted transactions would not occur. Derivatives Not Designated as Hedging Instruments under GAAP Interest Rate Swaps. The Corporation enters into positions with a derivative counterparty in order to offset its exposure on the fixed components of the customer interest rate swap agreements. The Corporation seeks to minimize counterparty credit risk by entering into transactions only with high-quality financial dealer institutions. These arrangements meet the definition of derivatives, but are not designated as hedging instruments under ASC 815, Derivatives and Hedging. The notional amount of these customer derivative agreements and the offsetting derivative counterparty positions each totaled $1,262,964 at December 31, 2015. Fair values included in other assets and other liabilities on the consolidated balance sheet applicable to these agreements amounted to $49,999 and $50,492, respectively, at December 31, 2015. At December 31, 2014, the notional amount of these customer derivative agreements and the offsetting derivative counterparty positions each totaled $972,002. At December 31, 2014, fair values included in other assets and other liabilities on the consolidated balance sheet amounted to $43,742 and $43,783, respectively. 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. Credit Risk Contracts. Risk participation agreements sold with notional amounts totaling $78,010 as of December 31, 2015 have remaining terms ranging from two to nine years. Under these agreements, the Corporation’s maximum exposure assuming a customer defaults on its obligation to perform under certain derivative swap contracts with third parties would be $133 at December 31, 2015 and $25 at December 31, 2014. The fair values of risk participation agreements purchased and sold were not material at December 31, 2015 and 2014. Counterparty Credit Risk The Corporation is party to master netting arrangements with most of its swap derivative counterparties. Collateral, usually marketable securities and/or cash, is exchanged between the Corporation and its counterparties, and is generally subject to thresholds and transfer minimums. For swap transactions that require central clearing, the Corporation posts cash to its clearing agency. Collateral positions are valued daily, and adjustments to amounts received and pledged by the Corporation are made as appropriate to maintain proper collateralization for these transactions. Certain master netting agreements contain provisions that, if violated, could cause the counterparties to request immediate settlement or demand full collateralization under the derivative instrument. If the Corporation had breached its agreements with its derivative counterparties it would be required to settle its obligations under the agreements at the termination value and would be required to pay an additional $1,333 and $1,862 as of December 31, 2015 and 2014, respectively, in excess of amounts previously posted as collateral with the respective counterparty. The following table presents information about derivative assets and derivative liabilities that are subject to enforceable master netting arrangements as well as those not subject to enforceable master netting arrangements: Gross Gross Net Amount December 31, 2015 Derivative Assets Subject to master netting arrangements: Interest rate contracts Designated $ 3,178 — $ 3,178 Not designated 1 — 1 Equity contracts – not designated 18 — 18 Not subject to master netting arrangements: Interest rate contracts – not designated 49,998 — 49,998 Credit contracts – not designated 7 — 7 $ 53,202 — $ 53,202 Derivative Liabilities Subject to master netting arrangements: Interest rate contracts Designated $ 962 — $ 962 Not designated 50,491 — 50,491 Not subject to master netting arrangements: Interest rate contracts – not designated 1 — 1 Credit contracts – not designated 133 — 133 Equity contracts – not designated 18 — 18 $ 51,605 — $ 51,605 December 31, 2014 Derivative Assets Subject to master netting arrangements: Interest rate contracts Designated $ 2,109 — $ 2,109 Not designated 140 — 140 Equity contracts – not designated 47 — 47 Not subject to master netting arrangements: Interest rate contracts – not designated 43,602 — 43,602 $ 45,898 — $ 45,898 Derivative Liabilities Subject to master netting arrangements: Interest rate contracts Designated $ 2,330 — $ 2,330 Not designated 43,655 — 43,655 Not subject to master netting arrangements: Interest rate contracts – not designated 128 — 128 Equity contracts – not designated 47 — 47 $ 46,160 — $ 46,160 The following table presents 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: Amount Not Offset in the Balance Sheet Net Amount the Balance Sheet Financial Cash Net Amount December 31, 2015 Derivative Assets Interest rate contracts: Designated $ 3,178 $ 1,516 $ 1,662 — Not designated 1 1 — — Equity contracts – not designated 18 18 — — $ 3,197 $ 1,535 $ 1,662 — Derivative Liabilities Interest rate contracts: Designated $ 962 $ 792 $ 170 $ — Not designated 50,491 24,579 24,632 1,280 $ 51,453 $ 25,371 $ 24,802 $ 1,280 December 31, 2014 Derivative Assets Interest rate contracts: Designated $ 2,109 $ 810 $ 1,299 — Not designated 140 138 2 — Equity contracts – not designated 47 47 — — $ 2,296 $ 995 $ 1,301 — Derivative Liabilities Interest rate contracts: Designated $ 2,330 $ 2,330 $ — $ — Not designated 43,655 28,646 13,243 1,766 $ 45,985 $ 30,976 $ 13,243 $ 1,766 The following table presents the effect of certain of the Corporation’s derivative financial instruments on the income statement: Income Statement Location Year Ended December 31, 2015 2014 Interest Rate Contracts Interest income – loans and leases $ 3,248 $ 3,314 Interest Rate Contracts Interest expense – short-term borrowings 292 — Interest Rate Swaps Other income (451 ) (123 ) Credit Risk Contracts Other income (126 ) — Other 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, 2015 and 2014 are not material

Commitments, Credit Risk and Co

Commitments, Credit Risk and Contingencies	12 Months Ended
	Dec. 31, 2015
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 2015 2014 Commitments to extend credit $ 3,781,719 $ 3,665,481 Standby letters of credit 92,979 121,186 At December 31, 2015, funding of 73.3% 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. In addition, debt issued by FNB Financial Services, LP, a wholly-owned finance subsidiary, is fully and unconditionally guaranteed by the Corporation. Other Legal Proceedings The Corporation and its subsidiaries are involved in various pending and threatened legal proceedings in which claims for monetary damages and other relief are asserted. These actions include claims brought against the Corporation and its subsidiaries where the Corporation or a subsidiary acted as one or more of the following: a depository bank, lender, underwriter, fiduciary, financial advisor, broker, acquiror 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.

Stock Incentive Plans

Stock Incentive Plans	12 Months Ended
	Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based 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). Beginning in 2014, the Corporation issues time-based awards and performance-based awards under these Plans, both of which are based on a three-year vesting period. The grant date fair value of the time-based awards is equal to the price of the Corporation’s common stock on the grant date. The fair value of the performance-based awards is based on a Monte-Carlo Simulation valuation of the Corporation’s common stock as of the grant date. The Corporation issued 400,436 and 119,589 performance-based restricted stock units in 2015 and 2014, respectively. Recipients will earn shares, totaling between 0% and 175% of the number of units issued, based on the Corporation’s total stockholder return relative to a specified peer group of financial institutions over the three-year period. These market-based restricted stock units are included in the table below as if the recipients earned shares equal to 100% of the units issued. Prior to 2014, more than half of the restricted stock awards granted to management were earned if the Corporation met or exceeded certain financial performance results when compared to its peers. These performance-related awards were expensed ratably from the date that the likelihood of meeting the performance measure was probable through the end of a four-year vesting period. The service-based awards were expensed ratably over a three-year vesting period. The Corporation also issued discretionary service-based awards to certain employees that vested over five years. During 2015, 2014 and 2013, the Corporation issued 664,337, 387,165 and 361,664 restricted stock awards, respectively; with aggregate weighted average grant date fair values of $8,802, $5,227 and $4,014 respectively, under these Plans. As of December 31, 2015, the Corporation had available up to 2,062,471 shares of common stock to issue under these Plans. The unvested restricted stock awards are eligible to receive cash dividends or dividend equivalents which are ultimately used to purchase additional shares of stock and 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 $4,461, $3,584 and $5,063 for the years ended December 31, 2015, 2014 and 2013, the tax benefit of which was $1,561, $1,254 and $1,772, respectively. The following table summarizes certain information concerning restricted stock awards: 2015 Weighted Average Grant 2014 Weighted Average Grant 2013 Weighted Average Grant Unvested shares outstanding at beginning of year 1,354,093 $ 11.86 1,729,033 $ 10.23 1,913,073 $ 9.17 Granted 664,337 13.25 387,165 13.50 361,664 11.10 Net adjustment due to performance 13,115 19.74 (36,600 ) 12.01 165,545 9.60 Vested (484,010 ) 10.70 (707,074 ) 8.81 (734,129 ) 7.90 Forfeited (41,130 ) 13.24 (65,399 ) 11.72 (37,828 ) 10.42 Dividend reinvestment 42,039 11.86 46,968 12.66 60,708 11.82 Unvested shares outstanding at end of year 1,548,444 12.85 1,354,093 11.86 1,729,033 10.23 The total fair value of shares vested was $6,070, $10,713 and $8,259 for the years ended December 31, 2015, 2014 and 2013, respectively. As of December 31, 2015, there was $9,279 of unrecognized compensation cost related to unvested restricted stock awards granted, $55 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, 2015 are as follows: Service- Awards Performance- Based Awards Total Unvested shares 632,054 916,390 1,548,444 Unrecognized compensation expense $ 3,737 $ 5,542 $ 9,279 Intrinsic value $ 8,432 $ 12,225 $ 20,657 Weighted average remaining life (in years) 1.92 2.58 2.31 Stock Options All outstanding stock options were assumed from acquisitions and are fully vested. Upon consummation of the Corporation’s acquisitions, all outstanding stock options issued by the acquired companies were converted into equivalent Corporation stock options. 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 93,822 for 2015, 517,192 for 2014 and 69,429 for 2013. The following table summarizes certain information concerning stock options: 2015 Weighted Average Price per Share 2014 Weighted Average Price per Share 2013 Weighted Average Price per Share Options outstanding at beginning of year 568,834 $ 8.86 533,524 $ 11.50 640,050 $ 13.21 Assumed from acquisitions — — 805,507 7.39 274,964 11.16 Exercised (93,822 ) 5.94 (690,973 ) 7.75 (69,429 ) 7.46 Forfeited (39,672 ) 15.66 (79,224 ) 21.40 (312,061 ) 15.58 Options outstanding and exercisable at end of year 435,340 8.86 568,834 8.86 533,524 11.50 The following table summarizes information about stock options outstanding at December 31, 2015: Range of Exercise Prices Options Outstanding and Exercisable Weighted Average Remaining Contractual Years Weighted Average Exercise Price $3.45 - $5.18 147,461 4.12 $ 4.74 $5.19 - $7.78 91,824 1.69 6.17 $11.69 - $17.54 190,285 1.74 12.68 $26.33 - $36.42 5,770 0.84 31.25 435,340 The intrinsic value of outstanding and exercisable stock options at December 31, 2015 was $2,050 . The following table summarizes certain information relating to stock options exercised: Year Ended December 31 2015 2014 2013 Proceeds from stock options exercised $ 557 $ 3,292 $ 365 Tax benefit recognized from stock options exercised 130 808 79 Intrinsic value of stock options exercised 693 3,289 318 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 conjunction with the Parkvale acquisition on January 1, 2012, 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, was sold at auction by the UST and was exercised at $5.81 per share during the second quarter of 2015. In conjunction with the ANNB acquisition on April 6, 2013, 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 at an exercise price of $3.57 per share. Subsequent adjustments related to actual dividends paid by the Corporation have increased the share amount of these warrants to 377,106, with a resulting lower exercise price of $3.24 per share as of December 31, 2015. The warrant, which was recorded at its fair value on April 6, 2013, was sold at auction by the UST and expires in 2019.

Retirement Plans

Retirement Plans	12 Months Ended
	Dec. 31, 2015
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. 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 2015 2014 Accumulated benefit obligation $ 150,754 $ 156,589 Projected benefit obligation at beginning of year $ 156,924 $ 139,731 Service cost (14 ) 62 Interest cost 5,897 6,411 Actuarial (gain) loss (3,381 ) 21,253 Benefits paid (8,411 ) (10,533 ) Projected benefit obligation at end of year $ 151,015 $ 156,924 Fair value of plan assets at beginning of year $ 140,140 $ 139,737 Actual return on plan assets (331 ) 9,613 Corporation contribution 1,364 1,323 Benefits paid (8,411 ) (10,533 ) Fair value of plan assets at end of year $ 132,762 $ 140,140 Funded status of plans $ (18,253 ) $ (16,784 ) 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 2015 2014 Weighted average discount rate 4.19 % 3.85 % Rates of average increase in compensation levels 3.50 % 4.00 % The discount rate assumption at December 31, 2015 and 2014 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 2015 2014 2013 Service cost $ (14 ) $ 62 $ 65 Interest cost 5,897 6,411 5,728 Expected return on plan assets (9,964 ) (9,946 ) (9,081 ) Transition amount amortization — (21 ) (93 ) Prior service credit amortization 7 7 7 Actuarial loss amortization 2,112 1,367 2,263 Net periodic pension cost (gain) (1,962 ) (2,120 ) (1,111 ) Other changes in plan assets and benefit obligations recognized in other comprehensive income: Current year actuarial loss (gain) 6,914 21,586 (20,938 ) Amortization of actuarial loss (2,112 ) (1,367 ) (2,263 ) Amortization of prior service credit (7 ) (7 ) (7 ) Amortization of transition asset — 21 93 Total recognized in other comprehensive income 4,795 20,233 (23,115 ) Total recognized in net periodic pension cost (gain) and other comprehensive income $ 2,833 $ 18,113 $ (24,226 ) 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 2015 2014 2013 Weighted average discount rate 3.85 % 4.67 % 3.78 % Rates of increase in compensation levels 4.00 % 4.00 % 4.00 % Expected long-term rate of return on assets 7.25 % 7.25 % 7.25 % 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 $7,047 and $9,211 for 2015 and 2014. The employer did not make any contributions to the qualified pension plans during 2015 or 2014. 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 $1,364 for 2015 and $1,322 for 2014. As of December 31, 2015 and 2014, 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 2015 2014 2015 2014 Projected benefit obligation $ 130,797 $ 135,998 $ 20,218 $ 20,926 Accumulated benefit obligation 130,797 135,998 19,957 20,591 Fair value of plan assets 132,762 140,140 — — The impact of changes in the discount rate and expected long-term rate of return on plan assets would have had the following effects on 2015 pension expense: Estimated 0.5% decrease in the discount rate $ (33 ) 0.5% decrease in the expected long-term rate of return on plan assets 687 The following table provides information regarding estimated future cash flows relating to the Plans at December 31, 2015: Expected employer contributions: 2016 $ 1,350 Expected benefit payments: 2016 7,244 2017 9,413 2018 8,177 2019 8,433 2020 8,731 2021 – 2025 45,879 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 of the Corporation. 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 $8,055 for 2015, $10,188 for 2014 and $9,300 for 2013. 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, 2015 and 2014, and the target allocation for 2016, by asset category: Target Percentage of Plan Assets December 31 2016 2015 2014 Asset Category Equity securities 45 - 65 % 57 % 57 % Debt securities 30 - 50 39 40 Cash equivalents 0 - 10 4 3 At December 31, 2015 and 2014, equity securities included 575,128 shares of the Corporation’s common stock, representing 5.8% and 5.5% of total plan assets at December 31, 2015 and 2014, respectively. Dividends received on the Corporation’s common stock held by the Plan were $276 and $272 for 2015 and 2014, respectively. 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, 2015 Asset Class Cash $ 4,847 $ — — $ 4,847 Equity securities: F.N.B. Corporation 7,672 — — 7,672 Other large-cap U.S. financial services companies 2,541 — — 2,541 Other large-cap U.S. companies 33,387 — — 33,387 International companies 521 — — 521 Other equity 596 — — 596 Mutual fund equity investments: U.S. equity index funds: U.S. large-cap equity index funds 511 — — 511 U.S. small-cap equity index funds 2,607 — — 2,607 U.S. mid-cap equity index funds 3,464 — — 3,464 Non-U.S. equities growth fund 9,613 — — 9,613 U.S. equity funds: U.S. mid-cap 6,989 — — 6,989 U.S. small-cap 2,679 — — 2,679 Other 5,540 — — 5,540 Fixed income securities: U.S. government agencies — 40,735 — 40,735 Fixed income mutual funds: U.S. investment-grade fixed income securities 10,648 — — 10,648 Non-U.S. fixed income securities 412 — — 412 $ 92,027 $ 40,735 — $ 132,762 December 31, 2014 Asset Class Cash $ 3,970 $ — — $ 3,970 Equity securities: F.N.B. Corporation 7,661 — — 7,661 Other large-cap U.S. financial services companies 2,653 — — 2,653 Other large-cap U.S. companies 34,286 — — 34,286 International companies 730 — — 730 Other equity 583 — — 583 Mutual fund equity investments: U.S. equity index funds: U.S. large-cap equity index funds 1,504 — — 1,504 U.S. small-cap equity index funds 2,946 — — 2,946 U.S. mid-cap equity index funds 3,803 — — 3,803 Non-U.S. equities growth fund 9,986 — — 9,986 U.S. equity funds: U.S. mid-cap 7,501 — — 7,501 U.S. small-cap 3,019 — — 3,019 Other 5,643 — — 5,643 Fixed income securities: U.S. government agencies — 44,417 — 44,417 Fixed income mutual funds: U.S. investment-grade fixed income securities 10,993 — — 10,993 Non-U.S. fixed income securities 445 — — 445 $ 95,723 $ 44,417 — $ 140,140 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, 2015
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 2015 2014 2013 Current income taxes: Federal taxes $ 69,572 $ 18,111 $ 33,614 State taxes 989 396 (116 ) 70,561 18,507 33,498 Deferred income taxes: Federal taxes 63 44,113 11,258 State taxes (631 ) — — (568 ) 44,113 11,258 $ 69,993 $ 62,620 $ 44,756 Income tax expense related to gains on the sale of securities was $288, $4,101 and $283 for 2015, 2014 and 2013, respectively. The following table presents the tax effects of temporary differences that give rise to deferred tax assets and liabilities: December 31 2015 2014 Deferred tax assets: Allowance for credit losses $ 50,414 $ 44,613 Discount on purchased loans 28,503 31,787 Net operating loss/tax credit carryforwards 16,487 15,367 Deferred compensation 8,515 7,785 Securities impairments 252 412 Pension and other defined benefit plans 8,539 6,871 Net unrealized securities losses 1,301 — Other 8,020 9,503 Total 122,031 116,338 Valuation allowance (17,179 ) (15,505 ) Total deferred tax assets 104,852 100,833 Deferred tax liabilities: Loan costs (2,966 ) (1,497 ) Depreciation (10,836 ) (11,533 ) Prepaid expenses (628 ) (705 ) Amortizable intangibles (12,940 ) (13,842 ) Lease financing (6,763 ) (7,302 ) Debt discharge income deferral (2,042 ) (2,829 ) Originated mortgage servicing rights (1,238 ) (2,721 ) Other (1,928 ) — Total deferred tax liabilities (39,341 ) (40,429 ) Net deferred tax assets $ 65,511 $ 60,404 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, 2015, the Corporation reversed $1,872 of the valuation allowance recorded against state deferred taxes due to expansion of operations in the state of Maryland as a result of recent mergers. The remaining balance of the valuation allowance primarily relates to unused state net operating loss carryforwards expiring from 2018 to 2035 and other net deferred tax assets. 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. The effective tax rates for 2015, 2014 and 2013 were all lower than the statutory tax rate due to tax benefits resulting from tax-exempt income on investments and 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 2015 2014 2013 Statutory tax rate 35.0 % 35.0 % 35.0 % State taxes, net of federal benefit 0.8 0.1 0.2 Valuation allowance reversal (0.8 ) — — Tax-exempt interest (2.2 ) (1.8 ) (2.9 ) Cash surrender value of life insurance (1.3 ) (1.3 ) (1.8 ) Tax credits (1.1 ) (1.4 ) (2.4 ) Other items 0.1 (0.3 ) (0.6 ) Actual effective tax rate 30.5 % 30.3 % 27.5 % 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 2015 2014 Balance at beginning of year $ 401 $ 660 Additions based on tax positions related to current year 134 60 Additions based on tax positions of prior year — — Reductions for tax positions of prior years — — Reductions due to expiration of statute of limitations (80 ) (319 ) Balance at end of year $ 455 $ 401 As of December 31, 2015 and 2014, the Corporation has approximately $455 and $401, respectively, of unrecognized tax benefits, excluding interest and the federal tax benefit of unrecognized state tax benefits. Also, as of December 31, 2015 and 2014, additional unrecognized tax benefits relating to accrued interest, net of the related federal tax benefit, amounted to $18 and $19, respectively. As of December 31, 2015, $313 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 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 2013. The Internal Revenue Service (IRS) has substantially completed their examination of the Corporation’s consolidated federal income tax returns for 2011 and 2012 and there are no outstanding unresolved issues. With limited exception, the Corporation is no longer subject to state income tax examinations for years prior to 2012. The Corporation anticipates that a reduction in the unrecognized tax benefit of up to $60 may occur in the next twelve months from the expiration of statutes of limitations which would result in a reduction in income taxes.

Comprehensive Income

Comprehensive Income	12 Months Ended
	Dec. 31, 2015
Equity [Abstract]
Comprehensive Income	18. Comprehensive Income The following table presents changes in AOCI, net of tax, by component: Year Ended December 31, 2015 Unrealized Net Gains (Losses) on Securities Available for Sale Unrealized Losses on Derivative Instruments Unrecognized Postretirement Obligations Total Balance at beginning of period $ (440 ) $ (143 ) $ (45,420 ) $ (46,003 ) Other comprehensive income (loss) before reclassifications (2,899 ) 3,694 (3,280 ) (2,485 ) Amounts reclassified from AOCI (534 ) (2,111 ) — (2,645 ) Net current period other comprehensive income (loss) (3,433 ) 1,583 (3,280 ) (5,130 ) Balance at end of period $ (3,873 ) $ 1,440 $ (48,700 ) $ (51,133 ) The amounts reclassified from AOCI related to securities available for sale are included in net securities gains on the Consolidated Statements of Comprehensive Income, while the amounts reclassified from AOCI related to derivative instruments are included in interest income on loans and leases on the Consolidated Statements of Comprehensive Income. The tax (benefit) expense amounts reclassified from AOCI in connection with the securities available for sale and derivative instruments reclassifications are included in income taxes on the Consolidated Statements of Comprehensive Income.

Earnings per Share

Earnings per Share	12 Months Ended
	Dec. 31, 2015
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 2015 2014 2013 Net income $ 159,649 $ 144,050 $ 117,804 Less: Preferred stock dividends 8,041 8,352 — Net income available to common stockholders $ 151,608 $ 135,698 $ 117,804 Basic weighted average common shares outstanding 174,971,785 167,347,906 146,186,982 Net effect of dilutive stock options, warrants, restricted stock and convertible debt 1,367,168 1,730,939 1,622,522 Diluted weighted average common shares outstanding 176,338,953 169,078,845 147,809,504 Basic earnings per common share $ 0.87 $ 0.81 $ 0.81 Diluted earnings per common share $ 0.86 $ 0.80 $ 0.80 For the years ended December 31, 2015, 2014 and 2013, 18,167, 35,442 and 49,995 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.

Regulatory Matters

Regulatory Matters	12 Months Ended
	Dec. 31, 2015
Banking and Thrift [Abstract]
Regulatory Matters	20. 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, dividends and future merger and acquisition activity. 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. As of December 31, 2015, 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 2014, the Corporation redeemed $33,000 of the Corporation-issued TPS. The regulatory capital ratios at December 31, 2015 and 2014 reflect this decrease in TPS and at December 31, 2015, the new Basel III requirements. Accordingly, at December 31, 2015, $14,375 or 25% of the remaining TPS is included in tier 1 capital and 75% is included in tier 2 capital. During 2016, the Corporation redeemed $10,000 of the TPS issued by Omega Financial Capital Trust I. Following are the capital ratios as of December 31, 2015 and 2014 for the Corporation and FNBPA (dollars in thousands): Actual Well-Capitalized Requirements Minimum Capital Requirements December 31, 2015 Amount Ratio Amount Ratio Amount Ratio F.N.B. Corporation: Total capital $ 1,629,270 12.9 % $ 1,268,396 10.0 % $ 1,014,717 8.0 % Tier 1 capital 1,321,972 10.4 1,014,717 8.0 761,038 6.0 Common equity tier 1 1,200,715 9.5 824,457 6.5 570,778 4.5 Leverage 1,321,972 8.1 811,553 5.0 649,243 4.0 FNBPA: Total capital 1,426,284 11.3 1,265,990 10.0 1,012,792 8.0 Tier 1 capital 1,289,965 10.2 1,012,792 8.0 759,594 6.0 Common equity tier 1 1,209,965 9.6 822,893 6.5 569,695 4.5 Leverage 1,289,965 8.0 803,041 5.0 642,433 4.0 December 31, 2014 F.N.B. Corporation: Total capital $ 1,417,369 12.4 % $ 1,146,556 10.0 % $ 917,245 8.0 % Tier 1 capital 1,269,033 11.1 687,934 6.0 458,623 4.0 Leverage 1,269,033 8.4 752,593 5.0 602,074 4.0 FNBPA: Total capital 1,321,433 11.5 1,147,427 10.0 917,941 8.0 Tier 1 capital 1,200,776 10.5 688,456 6.0 458,971 4.0 Leverage 1,200,776 8.1 744,235 5.0 595,388 4.0 The information presented in the table above reflects well-capitalized and minimum capital requirements in accordance with Basel III standards for the period ended December 31, 2015. The capital requirements presented for December 31, 2014 are based on the regulations that were in effect at that time. FNBPA was required to maintain aggregate cash reserves with the FRB amounting to $6,139 at December 31, 2015. 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, 2015, the Corporation’s subsidiaries had $181,131 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 $225,440 at December 31, 2015.

Cash Flow Information

Cash Flow Information	12 Months Ended
	Dec. 31, 2015
Supplemental Cash Flow Elements [Abstract]
Cash Flow Information	21. Cash Flow Information Following is a summary of cash flow information: Year Ended December 31 2015 2014 2013 Interest paid on deposits and other borrowings $ 47,805 $ 43,057 $ 46,337 Income taxes paid 61,500 27,000 34,200 Transfers of loans to other real estate owned 9,628 16,535 15,836 Transfers of other real estate owned to loans 372 390 701 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, 2015
Segment Reporting [Abstract]
Business Segments	22. 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 Manage- ment Insurance Consumer Parent and Consolidated At or for the Year Ended December 31, 2015 Interest income $ 500,030 $ — $ 89 $ 39,868 $ 6,808 $ 546,795 Interest expense 41,227 — — 3,518 3,828 48,573 Net interest income 458,803 — 89 36,350 2,980 498,222 Provision for credit losses 32,125 — — 7,396 920 40,441 Non-interest income 116,141 35,246 13,052 2,926 (4,955 ) 162,410 Non-interest expense 319,923 27,264 13,891 20,189 977 382,244 Intangible amortization 7,544 273 488 — — 8,305 Income tax expense (benefit) 65,071 2,803 (412 ) 4,709 (2,178 ) 69,993 Net income (loss) 150,281 4,906 (826 ) 6,982 (1,694 ) 159,649 Total assets 17,374,384 20,753 22,207 195,048 (54,730 ) 17,557,662 Total intangibles 853,551 10,447 12,923 1,809 — 878,730 At or for the Year Ended December 31, 2014 Interest income $ 463,376 $ — $ 98 $ 38,914 $ 6,595 $ 508,983 Interest expense 36,318 — — 3,352 3,016 42,686 Net interest income 427,058 — 98 35,562 3,579 466,297 Provision for credit losses 30,872 — — 6,920 856 38,648 Non-interest income 115,858 31,497 13,598 2,919 (5,598 ) 158,274 Non-interest expense 311,834 25,338 11,558 19,692 1,114 369,536 Intangible amortization 9,025 288 404 — — 9,717 Income tax expense (benefit) 57,634 2,135 625 4,430 (2,204 ) 62,620 Net income (loss) 133,551 3,736 1,109 7,439 (1,785 ) 144,050 Total assets 15,944,040 20,877 19,222 187,796 (44,845 ) 16,127,090 Total intangibles 857,066 10,720 10,122 1,809 — 879,717 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 credit 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

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2015
Fair Value Disclosures [Abstract]
Fair Value Measurements	23. 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 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 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, 2015, 99.9% of these securities used valuation methodologies involving market-based or market-derived information, collectively Level 1 and Level 2 measurements, to measure fair value. The remaining 0.1% of these securities 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 by Corporate personnel familiar with market liquidity and other market-related conditions. Derivative Financial Instruments The Corporation determines its fair value for derivatives using widely accepted valuation techniques including discounted cash flow analysis on the expected cash flows of each derivative. This analysis reflects contractual terms of the derivative, including the period to maturity and uses observable market based inputs, including interest rate curves and implied volatilities. The Corporation incorporates credit valuation adjustments to appropriately reflect both its own non-performance risk and the respective counterparty’s non-performance risk in the fair value measurements. In adjusting the fair value of its derivative contracts for the effect of non-performance risk, the Corporation considers the impact of netting and any applicable credit enhancements, such as collateral postings, thresholds, mutual puts and guarantees. Although the Corporation has determined that the majority of the inputs used to value its derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with its derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by itself and its counterparties. However, as of December 31, 2015, 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, 2015 Assets measured at fair value Available for sale debt securities U.S. Treasury $ — $ 29,796 $ — $ 29,796 U.S. government-sponsored entities — 367,994 — 367,994 Residential mortgage-backed securities Agency mortgage-backed securities — 704,831 — 704,831 Agency collateralized mortgage obligations — 495,830 — 495,830 Non-agency collateralized mortgage obligations — 6 1,184 1,190 Commercial mortgage-backed securities — 4,287 — 4,287 States of the U.S. and political subdivisions — 11,057 — 11,057 Other debt securities — 14,286 — 14,286 — 1,628,087 1,184 1,629,271 Available for sale equity securities Financial services industry 97 632 439 1,168 Insurance services industry 128 — — 128 225 632 439 1,296 225 1,628,719 1,623 1,630,567 Derivative financial instruments Trading — 50,017 — 50,017 Not for trading — 3,185 — 3,185 — 53,202 — 53,202 $ 225 $ 1,681,921 $ 1,623 $ 1,683,769 Liabilities measured at fair value Derivative financial instruments Trading — $ 50,510 — $ 50,510 Not for trading — 1,095 — 1,095 — $ 51,605 — $ 51,605 Level 1 Level 2 Level 3 Total December 31, 2014 Assets measured at fair value Available for sale debt securities U.S. Treasury $ — $ 29,682 $ — $ 29,682 U.S. government-sponsored entities — 337,133 — 337,133 Residential mortgage-backed securities Agency mortgage-backed securities — 554,085 — 554,085 Agency collateralized mortgage obligations — 573,171 — 573,171 Non-agency collateralized mortgage obligations — 11 1,420 1,431 Commercial mortgage-backed securities — 7,880 — 7,880 States of the U.S. and political subdivisions — 13,158 — 13,158 Other debt securities — 16,178 — 16,178 — 1,531,298 1,420 1,532,718 Available for sale equity securities Financial services industry 99 654 475 1,228 Insurance services industry 119 — — 119 218 654 475 1,347 218 1,531,952 1,895 1,534,065 Derivative financial instruments Trading — 43,789 — 43,789 Not for trading — 2,109 — 2,109 — 45,898 — 45,898 $ 218 $ 1,577,850 $ 1,895 $ 1,579,963 Liabilities measured at fair value Derivative financial instruments Trading — $ 43,830 — $ 43,830 Not for trading — 2,330 — 2,330 — $ 46,160 — $ 46,160 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 Debt Obligations Equity Residential Non-Agency Collateralized Mortgage Obligations Total Year Ended December 31, 2015 Balance at beginning of period — $ 475 $ 1,420 $ 1,895 Total gains (losses) – realized/unrealized: Included in earnings — — — — Included in other comprehensive income — 20 (4 ) 16 Accretion included in earnings — — 5 5 Purchases, issuances, sales and settlements: Purchases — — — — Issuances — — — — Sales/redemptions — — — — Settlements — — (237 ) (237 ) Transfers from Level 3 — (56 ) — (56 ) Transfers into Level 3 — — — — Balance at end of period — $ 439 $ 1,184 $ 1,623 Year Ended December 31, 2014 Balance at beginning of period $ 31,595 $ 410 $ 1,744 $ 33,749 Total gains (losses) – realized/unrealized: Included in earnings 13,766 — — 13,766 Included in other comprehensive income 5,608 65 3 5,676 Accretion included in earnings 657 — 5 662 Purchases, issuances, sales and settlements: Purchases — — — — Issuances — — — — Sales/redemptions (51,527 ) — — (51,527 ) Settlements (99 ) — (332 ) (431 ) Transfers from Level 3 — — — — Transfers into Level 3 — — — — Balance at end of period $ — $ 475 $ 1,420 $ 1,895 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 Available for Sale item in this footnote for information relating to determining Level 3 fair values. During 2015, the Corporation transferred an equity security totaling $56 to non-marketable equity securities, reflected in other assets on the Consolidated Balance Sheet. There were no transfers of assets or liabilities between the hierarchy levels for 2014. For the years ended December 31, 2015 and 2014, there were no gains or losses included in earnings attributable to the change in unrealized gains or losses relating to assets still held as of those dates. The total gains included in earnings are in the net securities gains line item in the Consolidated Statement of 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 at the balance sheet date, the following table provides the hierarchy level and the fair value of the related assets or portfolios: Level 1 Level 2 Level 3 Total December 31, 2015 Impaired loans — $ 124 $ 3,704 $ 3,828 Other real estate owned — 5,705 2,126 7,831 December 31, 2014 Impaired loans — $ 177 $ 1,528 $ 1,705 Other real estate owned — 5,695 2,365 8,060 Substantially all of the fair value amounts in the table above were estimated at a date during the twelve months ended December 31, 2015 and 2014. Consequently, the fair value information presented is not as of the period’s end. Impaired loans measured or re-measured at fair value on a non-recurring basis during 2015 had a carrying amount of $6,439 and an allocated allowance for credit losses of $2,650 at December 31, 2015. The allocated allowance is based on fair value of $3,828 less estimated costs to sell of $39. The allowance for credit losses includes a provision applicable to the current period fair value measurements of $1,494, which was included in the provision for credit losses for 2015. OREO with a carrying amount of $9,960 was written down to $6,950 (fair value of $7,831 less estimated costs to sell of $881), resulting in a loss of $3,010, which was included in earnings for 2015. 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. Securities. Loans. Derivative Assets and Liabilities. 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, 2015, 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. Short-Term Borrowings. Long-Term Borrowings. Loan Commitments and Standby Letters of Credit. Nature of Estimates The fair values of the Corporation’s financial instruments are as follows: Fair Value Measurements Carrying Fair Value Level 1 Level 2 Level 3 December 31, 2015 Financial Assets Cash and cash equivalents $ 489,119 $ 489,119 $ 489,119 $ — $ — Securities available for sale 1,630,567 1,630,567 225 1,628,719 1,623 Securities held to maturity 1,637,061 1,643,416 — 1,640,721 2,695 Net loans, including loans held for sale 12,053,209 11,863,882 — — 11,863,882 Derivative assets 53,202 53,202 — 53,202 — Accrued interest receivable 44,920 44,920 44,920 — — Financial Liabilities Deposits 12,623,463 12,610,914 10,157,997 2,452,917 — Short-term borrowings 2,048,896 2,048,943 2,048,943 — — Long-term borrowings 641,480 637,935 — — 637,935 Derivative liabilities 51,605 51,605 — 51,605 — Accrued interest payable 7,457 7,457 7,457 — — December 31, 2014 Financial Assets Cash and cash equivalents $ 287,393 $ 287,393 $ 287,393 $ — $ — Securities available for sale 1,534,065 1,534,065 218 1,531,952 1,895 Securities held to maturity 1,453,355 1,468,258 — 1,463,945 4,313 Net loans, including loans held for sale 11,127,292 10,956,544 — — 10,956,544 Derivative assets 45,898 45,898 — 45,898 — Accrued interest receivable 40,231 40,231 40,231 — — Financial Liabilities Deposits 11,382,208 11,382,402 8,771,173 2,611,229 — Short-term borrowings 2,041,658 2,041,672 2,041,672 — — Long-term borrowings 541,443 539,007 — — 539,007 Derivative liabilities 46,160 46,160 — 46,160 — Accrued interest payable 6,689 6,689 6,689 — —

Parent Company Financial Statem

Parent Company Financial Statements	12 Months Ended
	Dec. 31, 2015
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Parent Company Financial Statements	24. 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 December 31 2015 2014 Assets Cash and cash equivalents $ 227,554 $ 129,320 Securities available for sale 1,168 1,228 Other assets 17,206 16,615 Investment in bank subsidiary 2,073,352 2,006,808 Investments in and advances to non-bank subsidiaries 260,341 254,653 Total Assets $ 2,579,621 $ 2,408,624 Liabilities Other liabilities $ 26,831 $ 25,772 Advances from affiliates 289,540 292,337 Long-term borrowings 157,777 59,279 Subordinated notes: Short-term 8,216 8,351 Long-term 1,075 1,429 Total Liabilities 483,439 387,168 Stockholders’ Equity 2,096,182 2,021,456 Total Liabilities and Stockholders’ Equity $ 2,579,621 $ 2,408,624 Statements of Income Year Ended December 31 2015 2014 2013 Income Dividend income from subsidiaries: Bank $ 87,580 $ 85,000 $ 77,153 Non-bank 7,863 9,900 5,950 95,443 94,900 83,103 Interest income 4,845 4,856 5,277 Other income 1,053 1,920 1,874 Total Income 101,341 101,676 90,254 Expenses Interest expense 9,526 8,503 14,325 Other expenses 8,993 9,252 8,196 Total Expenses 18,519 17,755 22,521 Income Before Taxes and Equity in Undistributed Income of Subsidiaries 82,822 83,921 67,733 Income tax benefit 5,088 4,498 6,267 87,910 88,419 74,000 Equity in undistributed income (loss) of subsidiaries: Bank 71,581 55,742 42,094 Non-bank 158 (111 ) 1,710 Net Income $ 159,649 $ 144,050 $ 117,804 Statements of Cash Flows Year Ended December 31 2015 2014 2013 Operating Activities Net income $ 159,649 $ 144,050 $ 117,804 Adjustments to reconcile net income to net cash flows from operating activities: Undistributed earnings from subsidiaries (71,739 ) (55,631 ) (43,804 ) Other, net 680 (637 ) (6,218 ) Net cash flows provided by operating activities 88,590 87,782 67,782 Investing Activities Proceeds from sale of securities available for sale — 934 128 Net decrease in advances to subsidiaries 3,285 2,018 1,080 Net (increase) decrease in investment in subsidiaries (9,060 ) (2,877 ) 1,845 Net cash received (paid) in business combinations — 5,594 (3,533 ) Net cash flows (used in) provided by investing activities (5,775 ) 5,669 (480 ) Financing Activities Net decrease in advance from affiliate (2,797 ) (1,908 ) (854 ) Net (decrease) increase in short-term borrowings (135 ) (88 ) 84 Decrease in long-term debt (650 ) (34,865 ) (134,829 ) Increase in long-term debt 98,794 821 499 Net proceeds from issuance of preferred stock — — 106,882 Net proceeds from issuance of common stock 12,731 12,857 62,092 Tax benefit of stock-based compensation 28 2,714 1,326 Cash dividends paid: Preferred stock (8,041 ) (8,352 ) — Common stock (84,511 ) (81,220 ) (71,246 ) Net cash flows provided by (used in) financing activities 15,419 (110,041 ) (36,046 ) Net Increase (Decrease) in Cash and Cash Equivalents 98,234 (16,590 ) 31,256 Cash and cash equivalents at beginning of year 129,320 145,910 114,654 Cash and Cash Equivalents at End of Year $ 227,554 $ 129,320 $ 145,910 Cash paid during the year for: Interest $ 8,309 $ 9,112 $ 14,351

Summary of Significant Accoun34

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2015
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 (FNIA), LLC, Regency, Bank Capital Services, LLC, and F.N.B. Capital Corporation, 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 credit 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.
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 acquired in conjunction with acquisitions during 2014 and 2013 were classified as trading securities and were carried at fair value, with unrealized gains (losses) reflected through the consolidated statement of income. The Corporation both acquired and sold these trading securities during the quarters in which each of the acquisitions occurred. As of December 31, 2015 and 2014, 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 securities 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 investments’ 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. 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. 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 (AOCI), net of tax. Amounts are reclassified from AOCI 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
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 with the majority 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 collectability 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 collectability. A loan is returned to accrual status when principal and interest are no longer past due and collectability 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 credit 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 Credit Losses	Allowance for Credit Losses The allowance for credit losses is established as losses are estimated to have occurred through a provision charged to earnings. Loan losses are charged against the allowance for credit losses when management believes the uncollectability of a loan balance is confirmed. Subsequent recoveries, if any, are credited to the allowance for credit losses. Allowances for impaired commercial loans over $500 are generally determined based on collateral values or the present value of estimated cash flows. All other impaired loans are evaluated in the aggregate based on loan segment loss given default. Changes in the allowance for credit losses related to impaired loans are charged or credited to the provision for credit losses. The allowance for credit 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 credit 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 credit losses is inherently subjective as it requires significant estimates, including the amounts and timing of expected future cash flows on impaired loans, estimated losses on pools of homogeneous loans based on transition matrices with predefined loss emergence periods and consideration of qualitative factors, all of which are susceptible to significant change. Credit impaired loans obtained through acquisitions are accounted for under the provisions of ASC 310-30. The Corporation also accounts for certain acquired loans considered performing at the time of acquisition by analogy to ASC 310-30. ASC 310-30 requires the initial recognition of acquired loans at the present value of amounts expected to be received. Any deterioration in the credit quality of acquired loans subsequent to acquisition would be considered in the allowance for credit 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 credit 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 credit 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 credit losses resulting in an increase in the allowance for credit 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 accelerated methods. Customer renewal lists and mortgage servicing rights are amortized over their estimated useful lives which range from eight to thirteen 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 quantitative 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 quantitative 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, 2015. 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 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.
Retirement Plans	Retirement 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
Stock Based Compensation	Stock Based Compensation The Corporation accounts for its stock based compensation awards in accordance with ASC 718, Compensation – Stock Compensation, 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.
Financial Instruments - Recognition and Measurement	Financial Instruments – Recognition and Measurement In January 2016, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2016-01, Financial Instruments-Overall: Recognition and Measurement of Financial Assets and Financial Liabilities. The new guidance requires entities to measure investments in certain equity securities and other equity investments at the end of each reporting period at fair value, and to recognize changes therein in net income for the period. Financial liabilities measured using the FVO in ASC 825 will present separately in OCI the change in fair value caused by a change in instrument-specific credit risk. This change amends current US GAAP which requires the entire change in fair value to be recognized through earnings. The new guidance also requires certain additional disclosures in the statement of financial position or in the accompanying notes to the financial statements. In addition, entities will be required to use the exit price when measuring the fair value of financial instruments carried at amortized cost. The guidance is effective for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption of this guidance is not permitted except for the provision requiring recognition of the fair value changes caused by a change in instrument-specific credit risk in OCI for financial liabilities measured using the FVO in ASC 825. The adoption of this update is not expected to have a material effect on the consolidated financial statements, results of operations or liquidity of the Corporation.
Insurance - Disclosures about Short-Duration Contracts	Insurance – Disclosures about Short-Duration Contracts In May 2015, the FASB issued ASU No. 2015-09, Financial Services–Insurance: Disclosures about Short-Duration Contracts.
Cloud Computing Arrangements	Cloud Computing Arrangements In April 2015, the FASB issued ASU No. 2015-05, Intangibles-Goodwill and Other-Internal-Use Software Customer’s Accounting for Fees Paid in a Cloud Computing Arrangement.
Interest - Imputation of Interest	Interest – Imputation of Interest In April 2015, the FASB issued ASU No. 2015-03, Interest–Imputation of Interest: Simplifying the Presentation of Debt Issuance Costs.
Consolidation	Consolidation In February 2015, the FASB issued ASU No. 2015-02, Consolidation: Amendments to the Consolidation Analysis
Revenue Recognition	Revenue Recognition In May, 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers, to clarify the principles for recognizing revenue and to improve financial reporting by creating a single, principle-based revenue recognition framework. The core principle requires an entity to recognize revenue in a manner that depicts the transfer of promised goods and services to customers at an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. All arrangements involving the transfer of goods and services to customers are within the scope of the guidance, except for certain contracts subject to other U.S. GAAP guidance, including lease contracts and rights and obligations related to financing arrangements and financial instruments. The guidance is effective for annual reporting periods beginning after December 15, 2017. Early adoption is permitted, but not before annual reporting periods beginning after December 15, 2016. The guidance can be adopted using either the full retrospective approach or a modified retrospective approach. The Corporation will apply the guidance using a modified retrospective approach. The Corporation is in process of assessing the potential impact the adoption of this guidance will have on its consolidated financial statements.
Adjustments for New Accounting Pronouncement [Member]
Business Combinations	Business Combinations – Simplifying the Accounting for Measurement-Period Adjustments In September 2015, the FASB issued ASU No. 2015-16, Business Combinations: Simplifying the Accounting for Measurement-Period Adjustments.

Mergers and Acquisitions (Table

Mergers and Acquisitions (Tables)	12 Months Ended
	Dec. 31, 2015
Business Combinations [Abstract]
Business Acquisition Pro Forma Information	The following pro forma financial information for the year ended December 31, 2015 reflects the Corporation’s estimated consolidated pro forma results of operations as if the METR acquisition occurred on January 1, 2015, unadjusted for potential cost savings: Revenue (net interest income and non-interest income) $ 790,391 Net income 171,850 Net income available to common stockholders 163,809 Earnings per common share – basic 0.78 Earnings per common share – diluted 0.78
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 acquisitions noted above: Bank of America Branches OBA BCSB Bancorp, Inc. PVF Capital Corp. Annapolis Bancorp, Fair value of consideration paid: Common stock issued, net of offering costs $ — $ 85,554 $ 80,547 $ 109,856 $ 54,065 Warrant assumed — — — — 2,235 Total consideration paid — 85,554 80,547 109,856 56,300 Fair value of identifiable assets acquired: Cash and cash equivalents 148,159 32,913 26,980 99,738 41,986 Securities — 39,891 208,538 47,258 99,309 Loans 842 291,393 304,932 512,795 256,212 Other intangible assets 3,000 4,304 6,591 15,288 3,775 Other assets 1,133 21,659 49,081 62,150 28,970 Total identifiable assets acquired 153,134 390,160 596,122 737,229 430,252 Fair value of liabilities assumed: Deposits 154,619 295,922 532,197 628,019 349,370 Borrowings — 27,602 17,011 37,241 58,204 Other liabilities — 1,189 8,819 17,840 2,232 Total liabilities assumed 154,619 324,713 558,027 683,100 409,806 Fair value of net identifiable assets acquired (1,485 ) 65,447 38,095 54,129 20,446 Goodwill recognized $ 1,485 $ 20,107 $ 42,452 $ 55,727 $ 35,854

Securities (Tables)

Securities (Tables)	12 Months Ended
	Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Schedule of Amortized Cost and Fair Value of Securities Available for Sale	The amortized cost and fair value of securities are as follows: Amortized Cost Gross Gross Fair Securities Available for Sale: December 31, 2015 U.S. Treasury $ 29,738 $ 58 $ — $ 29,796 U.S. government-sponsored entities 368,463 856 (1,325 ) 367,994 Residential mortgage-backed securities: Agency mortgage-backed securities 703,069 4,594 (2,832 ) 704,831 Agency collateralized mortgage obligations 503,328 1,032 (8,530 ) 495,830 Non-agency collateralized mortgage obligations 1,177 13 — 1,190 Commercial mortgage-backed securities 4,299 — (12 ) 4,287 States of the U.S. and political subdivisions 10,748 309 — 11,057 Other debt securities 14,729 208 (651 ) 14,286 Total debt securities 1,635,551 7,070 (13,350 ) 1,629,271 Equity securities 975 324 (3 ) 1,296 $ 1,636,526 $ 7,394 $ (13,353 ) $ 1,630,567 December 31, 2014 U.S. Treasury $ 29,604 $ 78 $ — $ 29,682 U.S. government-sponsored entities 338,330 742 (1,939 ) 337,133 Residential mortgage-backed securities: Agency mortgage-backed securities 546,572 7,548 (35 ) 554,085 Agency collateralized mortgage obligations 580,601 1,617 (9,047 ) 573,171 Non-agency collateralized mortgage obligations 1,414 17 — 1,431 Commercial mortgage-backed securities 7,891 — (11 ) 7,880 States of the U.S. and political subdivisions 12,713 477 (32 ) 13,158 Other debt securities 16,615 420 (857 ) 16,178 Total debt securities 1,533,740 10,899 (11,921 ) 1,532,718 Equity securities 1,031 316 — 1,347 $ 1,534,771 $ 11,215 $ (11,921 ) $ 1,534,065 December 31, 2013 U.S. government-sponsored entities $ 336,763 $ 126 $ (5,904 ) $ 330,985 Residential mortgage-backed securities: Agency mortgage-backed securities 247,880 4,304 (1,303 ) 250,881 Agency collateralized mortgage obligations 511,098 895 (20,794 ) 491,199 Non-agency collateralized mortgage obligations 1,747 15 — 1,762 States of the U.S. and political subdivisions 16,842 410 (250 ) 17,002 Collateralized debt obligations 37,203 4,507 (10,115 ) 31,595 Other debt securities 16,505 524 (929 ) 16,100 Total debt securities 1,168,038 10,781 (39,295 ) 1,139,524 Equity securities 1,444 682 — 2,126 $ 1,169,482 $ 11,463 $ (39,295 ) $ 1,141,650
Schedule of Amortized Cost and Fair Value of Securities Held to Maturity	Amortized Cost Gross Gross Fair Securities Held to Maturity: December 31, 2015 U.S. Treasury $ 500 $ 153 $ — $ 653 U.S. government-sponsored entities 137,385 809 (395 ) 137,799 Residential mortgage-backed securities: Agency mortgage-backed securities 709,970 9,858 (1,176 ) 718,652 Agency collateralized mortgage obligations 499,694 803 (7,657 ) 492,840 Non-agency collateralized mortgage obligations 2,681 14 — 2,695 Commercial mortgage-backed securities 51,258 115 (259 ) 51,114 States of the U.S. and political subdivisions 235,573 4,191 (101 ) 239,663 $ 1,637,061 $ 15,943 $ (9,588 ) $ 1,643,416 December 31, 2014 U.S. Treasury $ 502 $ 168 $ — $ 670 U.S. government-sponsored entities 101,602 885 (524 ) 101,963 Residential mortgage-backed securities: Agency mortgage-backed securities 677,169 16,712 (346 ) 693,535 Agency collateralized mortgage obligations 501,965 1,858 (7,329 ) 496,494 Non-agency collateralized mortgage obligations 4,285 28 — 4,313 Commercial mortgage-backed securities 17,560 179 — 17,739 States of the U.S. and political subdivisions 150,272 3,315 (43 ) 153,544 $ 1,453,355 $ 23,145 $ (8,242 ) $ 1,468,258 December 31, 2013 U.S. Treasury $ 503 $ 99 $ — $ 602 U.S. government-sponsored entities 43,322 180 (1,151 ) 42,351 Residential mortgage-backed securities: Agency mortgage-backed securities 628,681 12,281 (6,032 ) 634,930 Agency collateralized mortgage obligations 385,408 764 (15,844 ) 370,328 Non-agency collateralized mortgage obligations 6,852 44 (4 ) 6,892 Commercial mortgage-backed securities 2,241 124 (37 ) 2,328 States of the U.S. and political subdivisions 132,162 1,992 (2,022 ) 132,132 $ 1,199,169 $ 15,484 $ (25,090 ) $ 1,189,563
Gross Gains and Gross Losses Realized on Sales of Securities	Gross gains and gross losses were realized on securities as follows: Year Ended December 31 2015 2014 2013 Gross gains $ 831 $ 20,241 $ 1,200 Gross losses (9 ) (8,524 ) (392 ) $ 822 $ 11,717 $ 808
Amortized Cost and Fair Value of Securities, by Contractual Maturities	As of December 31, 2015, the amortized cost and fair value of securities, by contractual maturities, were as follows: Available for Sale Held to Maturity Amortized Fair Value Amortized Fair Value Due in one year or less $ 5,178 $ 5,183 $ 2,409 $ 2,426 Due from one to five years 403,591 403,401 136,744 136,841 Due from five to ten years 10,013 10,304 64,954 66,347 Due after ten years 4,896 4,245 169,351 172,501 423,678 423,133 373,458 378,115 Residential mortgage-backed securities: Agency mortgage-backed securities 703,069 704,831 709,970 718,652 Agency collateralized mortgage obligations 503,328 495,830 499,694 492,840 Non-agency collateralized mortgage obligations 1,177 1,190 2,681 2,695 Commercial mortgage-backed securities 4,299 4,287 51,258 51,114 Equity securities 975 1,296 — — $ 1,636,526 $ 1,630,567 $ 1,637,061 $ 1,643,416
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 Losses # Fair Unrealized # Fair Unrealized Securities Available for Sale: December 31, 2015 U.S. government-sponsored entities 6 $ 99,131 $ (814 ) 2 $ 34,487 $ (511 ) 8 $ 133,618 $ (1,325 ) Residential mortgage-backed securities: Agency mortgage-backed securities 19 359,250 (2,832 ) — — — 19 359,250 (2,832 ) Agency collateralized mortgage obligations 9 126,309 (1,366 ) 18 215,330 (7,164 ) 27 341,639 (8,530 ) Commercial mortgage-backed securities 1 4,287 (12 ) — — — 1 4,287 (12 ) Other debt securities — — — 3 4,245 (651 ) 3 4,245 (651 ) Equity securities 1 632 (3 ) — — — 1 632 (3 ) 36 $ 589,609 $ (5,027 ) 23 $ 254,062 $ (8,326 ) 59 $ 843,671 $ (13,353 ) December 31, 2014 U.S. government-sponsored entities 7 $ 89,986 $ (275 ) 7 $ 99,326 $ (1,664 ) 14 $ 189,312 $ (1,939 ) Residential mortgage-backed securities: Agency mortgage-backed securities 2 45,145 (35 ) — — — 2 45,145 (35 ) Agency collateralized mortgage obligations 9 166,908 (1,238 ) 16 225,700 (7,809 ) 25 392,608 (9,047 ) Commercial mortgage-backed securities 1 7,880 (11 ) — — — 1 7,880 (11 ) States of the U.S. and political subdivisions — — — 1 1,159 (32 ) 1 1,159 (32 ) Other debt securities — — — 4 6,030 (857 ) 4 6,030 (857 ) 19 $ 309,919 $ (1,559 ) 28 $ 332,215 $ (10,362 ) 47 $ 642,134 $ (11,921 ) Securities Held to Maturity: December 31, 2015 U.S. government-sponsored entities 3 $ 39,843 $ (173 ) 1 $ 14,778 $ (222 ) 4 $ 54,621 $ (395 ) Residential mortgage-backed securities: Agency mortgage-backed securities 17 212,024 (1,159 ) 1 917 (17 ) 18 212,941 (1,176 ) Agency collateralized mortgage obligations 11 150,593 (1,434 ) 14 160,716 (6,223 ) 25 311,309 (7,657 ) Commercial mortgage-backed securities 3 46,278 (259 ) — — — 3 46,278 (259 ) States of the U.S. and political subdivisions 9 17,616 (101 ) — — — 9 17,616 (101 ) 43 $ 466,354 $ (3,126 ) 16 $ 176,411 $ (6,462 ) 59 $ 642,765 $ (9,588 ) December 31, 2014 U.S. government-sponsored entities 2 $ 24,989 $ (40 ) 2 $ 29,516 $ (484 ) 4 $ 54,505 $ (524 ) Residential mortgage-backed securities: Agency mortgage-backed securities 1 1,099 (1 ) 4 45,042 (345 ) 5 46,141 (346 ) Agency collateralized mortgage obligations 8 104,071 (630 ) 14 189,642 (6,699 ) 22 293,713 (7,329 ) States of the U.S. and political subdivisions 1 1,427 (4 ) 4 5,453 (39 ) 5 6,880 (43 ) 12 $ 131,586 $ (675 ) 24 $ 269,653 $ (7,567 ) 36 $ 401,239 $ (8,242 )
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 Debt Obligations Equities Total For the Year Ended December 31, 2015 Beginning balance $ — $ 27 $ 27 Loss where impairment was not previously recognized — — — Additional loss where impairment was previously recognized — — — Reduction due to credit impaired securities sold — — — Ending balance $ — $ 27 $ 27 For the Year Ended December 31, 2014 Beginning balance $ 17,155 $ 27 $ 17,182 Loss where impairment was not previously recognized — — — Additional loss where impairment was previously recognized — — — Reduction due to credit impaired securities sold (17,155 ) — (17,155 ) Ending balance $ — $ 27 $ 27

Loans and Leases (Tables)

Loans and Leases (Tables)	12 Months Ended
	Dec. 31, 2015
Receivables [Abstract]
Summary of Loans and Leases, Net of Unearned Income	Following is a summary of loans and leases, net of unearned income: Originated Loans and Acquired Total Loans and December 31, 2015 Commercial real estate $ 3,531,146 $ 577,910 $ 4,109,056 Commercial and industrial 2,534,351 67,371 2,601,722 Commercial leases 204,553 — 204,553 Total commercial loans and leases 6,270,050 645,281 6,915,331 Direct installment 1,660,717 45,919 1,706,636 Residential mortgages 1,044,689 351,282 1,395,971 Indirect installment 996,175 554 996,729 Consumer lines of credit 1,021,830 115,425 1,137,255 Other 38,518 — 38,518 $ 11,031,979 $ 1,158,461 $ 12,190,440 December 31, 2014 Commercial real estate $ 3,031,810 $ 783,898 $ 3,815,708 Commercial and industrial 2,197,793 120,222 2,318,015 Commercial leases 177,824 — 177,824 Total commercial loans and leases 5,407,427 904,120 6,311,547 Direct installment 1,579,770 64,851 1,644,621 Residential mortgages 817,586 445,467 1,263,053 Indirect installment 873,645 1,906 875,551 Consumer lines of credit 946,427 164,549 1,110,976 Other 41,290 — 41,290 $ 9,666,145 $ 1,580,893 $ 11,247,038
Summary of Loans to Related Parties	Following is an analysis of these loans to related parties: Total loans at December 31, 2014 $ 42,263 New loans 4,954 Repayments (3,802 ) Other (1,614 ) Total loans at December 31, 2015 $ 41,801
Summary of Outstanding Principal Balance and Carrying Amount of Acquired Loans	The outstanding balance and the carrying amount of acquired loans included in the consolidated balance sheet are as follows: 2015 2014 December 31 Accounted for under ASC 310-30: Outstanding balance $ 1,258,418 $ 1,597,558 Carrying amount 1,011,139 1,344,171 Accounted for under ASC 310-20: Outstanding balance 146,161 242,488 Carrying amount 140,595 228,748 Total acquired loans: Outstanding balance 1,404,579 1,840,046 Carrying amount 1,151,734 1,572,919
Summary of Change in Accretable Yield of Acquired Loans	The following table provides changes in accretable yield for all acquired loans accounted for under ASC 310-30. Loans accounted for under ASC 310-20 are not included in this table. Year Ended December 31 2015 2014 Balance at beginning of period $ 331,899 $ 305,646 Acquisitions — 125,001 Reduction due to unexpected early payoffs (47,075 ) (48,556 ) Reclass from non-accretable difference 32,141 29,643 Disposals/transfers (674 ) (5,513 ) Accretion (60,171 ) (74,322 ) Balance at end of period $ 256,120 $ 331,899
Summary of Non-Performing Assets	Following is a summary of non-performing assets: December 31 2015 2014 Non-accrual loans $ 49,897 $ 45,113 Troubled debt restructurings 22,028 23,439 Total non-performing loans 71,925 68,552 Other real estate owned (OREO) 38,918 41,466 Total non-performing assets $ 110,843 $ 110,018 Asset quality ratios: Non-performing loans as a percent of total loans and leases 0.59 % 0.61 % Non-performing loans + OREO as a percent of total loans and leases + OREO 0.91 % 0.97 % Non-performing assets as a percent of total assets 0.63 % 0.68 %
Age Analysis of Past Due Loans, by Class	The following tables provide an analysis of the aging of loans by class segregated by loans and leases originated and loans acquired: 30-89 Days Past Due ³ 90 Days Still Accruing Non- Accrual Total Past Due Current Total Loans and Originated Loans and Leases December 31, 2015 Commercial real estate $ 11,006 $ 1 $ 23,503 $ 34,510 $ 3,496,636 $ 3,531,146 Commercial and industrial 5,409 3 14,382 19,794 2,514,557 2,534,351 Commercial leases 924 — 659 1,583 202,970 204,553 Total commercial loans and leases 17,339 4 38,544 55,887 6,214,163 6,270,050 Direct installment 9,254 3,813 4,806 17,873 1,642,844 1,660,717 Residential mortgages 8,135 1,470 2,882 12,487 1,032,202 1,044,689 Indirect installment 9,472 379 1,361 11,212 984,963 996,175 Consumer lines of credit 2,410 1,189 1,181 4,780 1,017,050 1,021,830 Other 73 169 — 242 38,276 38,518 $ 46,683 $ 7,024 $ 48,774 $ 102,481 $ 10,929,498 $ 11,031,979 December 31, 2014 Commercial real estate $ 9,601 $ 313 $ 24,132 $ 34,046 $ 2,997,764 $ 3,031,810 Commercial and industrial 2,446 3 8,310 10,759 2,187,034 2,197,793 Commercial leases 961 43 722 1,726 176,098 177,824 Total commercial loans and leases 13,008 359 33,164 46,531 5,360,896 5,407,427 Direct installment 9,333 3,617 7,117 20,067 1,559,703 1,579,770 Residential mortgages 8,709 3,891 2,964 15,564 802,022 817,586 Indirect installment 7,804 684 1,149 9,637 864,008 873,645 Consumer lines of credit 2,408 562 719 3,689 942,738 946,427 Other 13 135 — 148 41,142 41,290 $ 41,275 $ 9,248 $ 45,113 $ 95,636 $ 9,570,509 $ 9,666,145 30-89 Days Past Due ³ 90 Days Non- Total Past Due (1)(2) Current Discount Total Loans Acquired Loans December 31, 2015 Commercial real estate $ 6,399 $ 12,752 $ 931 $ 20,082 $ 593,128 $ (35,300 ) $ 577,910 Commercial and industrial 1,065 616 103 1,784 72,037 (6,450 ) 67,371 Total commercial loans 7,464 13,368 1,034 21,866 665,165 (41,750 ) 645,281 Direct installment 837 659 — 1,496 43,596 827 45,919 Residential mortgages 5,871 15,136 — 21,007 366,742 (36,467 ) 351,282 Indirect installment 32 9 — 41 571 (58 ) 554 Consumer lines of credit 830 546 89 1,465 117,443 (3,483 ) 115,425 $ 15,034 $ 29,718 $ 1,123 $ 45,875 $ 1,193,517 $ (80,931 ) $ 1,158,461 December 31, 2014 Commercial real estate $ 12,076 $ 12,368 — $ 24,444 $ 799,991 $ (40,537 ) $ 783,898 Commercial and industrial 687 1,968 — 2,655 127,535 (9,968 ) 120,222 Total commercial loans 12,763 14,336 — 27,099 927,526 (50,505 ) 904,120 Direct installment 2,670 1,443 — 4,113 59,532 1,206 64,851 Residential mortgages 8,159 19,936 — 28,095 456,810 (39,438 ) 445,467 Indirect installment 38 30 — 68 2,179 (341 ) 1,906 Consumer lines of credit 1,048 2,279 — 3,327 166,912 (5,690 ) 164,549 $ 24,678 $ 38,024 — $ 62,702 $ 1,612,959 $ (94,768 ) $ 1,580,893 (1) Past due information for loans acquired is based on the contractual balance outstanding at December 31, 2015 and 2014. (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. In these instances, 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. Acquired loans are considered non-accrual or non-performing when, due to credit deterioration or other factors, the Corporation determines it is no longer able to reasonably estimate the timing and amount of expected cash flows on such loans. The Corporation does not recognize interest income on acquired loans considered non-accrual or non-performing.
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 and leases originated and loans acquired: Commercial Loan and Lease Credit Quality Categories Pass Special Substandard Doubtful Total Originated Loans and Leases December 31, 2015 Commercial real estate $ 3,416,527 $ 52,887 $ 61,411 $ 321 $ 3,531,146 Commercial and industrial 2,335,103 109,539 87,380 2,329 2,534,351 Commercial leases 198,207 2,447 3,899 — 204,553 $ 5,949,837 $ 164,873 $ 152,690 $ 2,650 $ 6,270,050 December 31, 2014 Commercial real estate $ 2,890,830 $ 58,630 $ 81,951 $ 399 $ 3,031,810 Commercial and industrial 2,085,893 71,420 39,684 796 2,197,793 Commercial leases 174,677 2,198 949 — 177,824 $ 5,151,400 $ 132,248 $ 122,584 $ 1,195 $ 5,407,427 Acquired Loans December 31, 2015 Commercial real estate $ 464,162 $ 47,619 $ 66,129 — $ 577,910 Commercial and industrial 56,446 3,182 7,743 — 67,371 $ 520,608 $ 50,801 $ 73,872 — $ 645,281 December 31, 2014 Commercial real estate $ 610,260 $ 73,891 $ 99,747 — $ 783,898 Commercial and industrial 103,862 3,506 12,854 — 120,222 $ 714,122 $ 77,397 $ 112,601 — $ 904,120
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, 2015 Direct installment $ 1,646,925 $ 13,792 $ 1,660,717 Residential mortgages 1,031,926 12,763 1,044,689 Indirect installment 994,661 1,514 996,175 Consumer lines of credit 1,019,783 2,047 1,021,830 Other 38,518 — 38,518 December 31, 2014 Direct installment $ 1,565,090 $ 14,680 $ 1,579,770 Residential mortgages 802,522 15,064 817,586 Indirect installment 872,340 1,305 873,645 Consumer lines of credit 944,631 1,796 946,427 Other 41,290 — 41,290
Summary of Impaired Loans and Leases, by Class	Following is a summary of information pertaining to originated loans and leases considered to be impaired, by class of loan and lease: Unpaid Principal Balance Recorded Investment Reserve Recorded Investment Specific Reserve Total Recorded Investment Specific Average Recorded Investment At or for the Year Ended December 31, 2015 Commercial real estate $ 33,780 $ 24,423 $ 772 $ 25,195 $ 321 $ 26,143 Commercial and industrial 15,860 9,176 5,543 14,719 2,329 12,298 Commercial leases 659 659 — 659 — 747 Total commercial loans and leases 50,299 34,258 6,315 40,573 2,650 39,188 Direct installment 14,679 13,792 — 13,792 — 13,267 Residential mortgages 13,394 12,763 — 12,763 — 12,896 Indirect installment 3,745 1,514 — 1,514 — 1,401 Consumer lines of credit 2,408 2,047 — 2,047 — 2,198 $ 84,525 $ 64,374 $ 6,315 $ 70,689 $ 2,650 $ 68,950 At or for the Year Ended December 31, 2014 Commercial real estate $ 34,583 $ 25,443 $ 883 $ 26,326 $ 399 $ 30,807 Commercial and industrial 11,412 7,609 1,948 9,557 780 9,510 Commercial leases 722 722 — 722 — 686 Total commercial loans and leases 46,717 33,774 2,831 36,605 1,179 41,003 Direct installment 14,987 14,680 — 14,680 — 14,248 Residential mortgages 16,791 15,064 — 15,064 — 16,924 Indirect installment 1,467 1,305 — 1,305 — 1,399 Consumer lines of credit 1,803 1,796 — 1,796 — 1,793 $ 81,765 $ 66,619 $ 2,831 $ 69,450 $ 1,179 $ 75,367
Summary of Composition of Total TDRs	Following is a summary of the composition of total TDRs: December 31 2015 2014 Accruing: Performing $ 15,165 $ 9,441 Non-performing 22,028 23,439 Non-accrual 8,307 8,272 $ 45,500 $ 41,152
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 2015 2014 Number of Contracts Pre-Modification Recorded Investment Post- Outstanding Recorded Investment Number of Contracts Pre-Modification Recorded Investment Post- Outstanding Recorded Investment Commercial real estate 3 $ 1,165 $ 960 11 $ 2,946 $ 2,282 Commercial and industrial 1 5 4 4 573 540 Total commercial loans 4 1,170 964 15 3,519 2,822 Direct installment 489 6,712 6,314 522 5,742 5,422 Residential mortgages 45 1,667 1,660 46 2,456 2,357 Indirect installment 17 55 48 24 70 66 Consumer lines of credit 58 950 832 41 1,089 1,037 613 $ 10,554 $ 9,818 648 $ 12,876 $ 11,704
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 2015 2014 Number Contracts Recorded Investment (1) Number Contracts Recorded Investment (1) Commercial real estate 1 $ 26 — $ — Commercial and industrial — — — — Total commercial loans 1 26 — — Direct installment 97 510 97 728 Residential mortgages 7 306 4 151 Indirect installment 9 14 7 16 Consumer lines of credit — — 1 50 114 $ 856 109 $ 945 (1) The recorded investment is as of period end.

Allowance for Credit Losses (Ta

Allowance for Credit Losses (Tables)	12 Months Ended
	Dec. 31, 2015
Receivables [Abstract]
Summary of Changes in Allowance for Credit Losses by Loan and Lease Class	Following is a summary of changes in the allowance for credit losses, by loan and lease class: Balance at Beginning of Year Charge- Recoveries Net Provision Balance at End of Year Ended December 31, 2015 Commercial real estate $ 37,588 $ (4,443 ) $ 1,117 $ (3,326 ) $ 7,479 $ 41,741 Commercial and industrial 32,645 (3,562 ) 1,773 (1,789 ) 10,167 41,023 Commercial leases 2,398 (544 ) 101 (443 ) 586 2,541 Total commercial loans and leases 72,631 (8,549 ) 2,991 (5,558 ) 18,232 85,305 Direct installment 20,538 (10,844 ) 1,527 (9,317 ) 10,366 21,587 Residential mortgages 8,024 (1,010 ) 85 (925 ) 810 7,909 Indirect installment 7,504 (6,427 ) 1,190 (5,237 ) 7,622 9,889 Consumer lines of credit 8,496 (1,653 ) 175 (1,478 ) 2,564 9,582 Other 759 (1,691 ) 55 (1,636 ) 1,890 1,013 Total allowance on originated loans 117,952 (30,174 ) 6,023 (24,151 ) 41,484 135,285 Purchased credit-impaired loans 660 (64 ) 19 (45 ) 219 834 Other acquired loans 7,314 (830 ) 671 (159 ) (1,262 ) 5,893 Total allowance on acquired loans 7,974 (894 ) 690 (204 ) (1,043 ) 6,727 Total allowance $ 125,926 $ (31,068 ) $ 6,713 $ (24,355 ) $ 40,441 $ 142,012 Year Ended December 31, 2014 Commercial real estate $ 32,548 $ (6,568 ) $ 2,351 $ (4,217 ) $ 9,257 $ 37,588 Commercial and industrial 32,603 (3,454 ) 1,412 (2,042 ) 2,084 32,645 Commercial leases 1,903 (415 ) 105 (310 ) 805 2,398 Total commercial loans and leases 67,054 (10,437 ) 3,868 (6,569 ) 12,146 72,631 Direct installment 17,824 (9,600 ) 1,163 (8,437 ) 11,151 20,538 Residential mortgages 5,836 (760 ) 74 (686 ) 2,874 8,024 Indirect installment 6,409 (3,627 ) 875 (2,752 ) 3,847 7,504 Consumer lines of credit 7,231 (1,495 ) 218 (1,277 ) 2,542 8,496 Other 530 (1,329 ) 24 (1,305 ) 1,534 759 Total allowance on originated loans 104,884 (27,248 ) 6,222 (21,026 ) 34,094 117,952 Purchased credit-impaired loans 1,000 (2,614 ) 1 (2,613 ) 2,273 660 Other acquired loans 4,900 (873 ) 1,006 133 2,281 7,314 Total allowance on acquired loans 5,900 (3,487 ) 1,007 (2,480 ) 4,554 7,974 Total allowance $ 110,784 $ (30,735 ) $ 7,229 $ (23,506 ) $ 38,648 $ 125,926 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
Summary of Individual and Collective Allowance for Credit Losses and Loan and Lease Balances by Class	Following is a summary of the individual and collective originated allowance for credit losses and corresponding originated loan and lease balances by class: Allowance Loans and Leases Outstanding Individually Evaluated for Impairment Collectively Evaluated for Impairment Originated Individually Evaluated for Impairment Collectively Evaluated for Impairment December 31, 2015 Commercial real estate $ 321 $ 41,420 $ 3,531,146 $ 12,904 $ 3,518,242 Commercial and industrial 2,329 38,694 2,534,351 10,802 2,523,549 Commercial leases — 2,541 204,553 — 204,553 Total commercial loans and leases 2,650 82,655 6,270,050 23,706 6,246,344 Direct installment — 21,587 1,660,717 — 1,660,717 Residential mortgages — 7,909 1,044,689 — 1,044,689 Indirect installment — 9,889 996,175 — 996,175 Consumer lines of credit — 9,582 1,021,830 — 1,021,830 Other — 1,013 38,518 — 38,518 $ 2,650 $ 132,635 $ 11,031,979 $ 23,706 $ 11,008,273 December 31, 2014 Commercial real estate $ 399 $ 37,189 $ 3,031,810 $ 13,952 $ 3,017,858 Commercial and industrial 780 31,865 2,197,793 5,837 2,191,956 Commercial leases — 2,398 177,824 — 177,824 Total commercial loans and leases 1,179 71,452 5,407,427 19,789 5,387,638 Direct installment — 20,538 1,579,770 — 1,579,770 Residential mortgages — 8,024 817,586 — 817,586 Indirect installment — 7,504 873,645 — 873,645 Consumer lines of credit — 8,496 946,427 — 946,427 Other — 759 41,290 — 41,290 $ 1,179 $ 116,773 $ 9,666,145 $ 19,789 $ 9,646,356

Premises and Equipment (Tables)

Premises and Equipment (Tables)	12 Months Ended
	Dec. 31, 2015
Property, Plant and Equipment [Abstract]
Summary of Premises and Equipment	Following is a summary of premises and equipment: December 31 2015 2014 Land $ 33,023 $ 35,473 Premises 143,757 150,868 Equipment 130,066 117,223 306,846 303,564 Accumulated depreciation (147,766 ) (134,808 ) $ 159,080 $ 168,756
Summary of Future Minimum Lease Payments	Following is a summary of future minimum lease payments for years following December 31, 2015: 2016 $ 14,529 2017 13,373 2018 11,768 2019 9,637 2020 7,733 Later years 33,280

Goodwill and Other Intangible40

Goodwill and Other Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Rollforward of Goodwill	The following table shows a rollforward of goodwill by line of business: Community Wealth Manage- Insurance Consumer Finance Total Balance at January 1, 2014 $ 745,469 $ 8,020 $ 8,950 $ 1,809 $ 764,248 Goodwill additions 67,965 — — — 67,965 Balance at December 31, 2014 813,434 8,020 8,950 1,809 832,213 Goodwill (deductions) additions (1,035 ) — 1,908 — 873 Balance at December 31, 2015 $ 812,399 $ 8,020 $ 10,858 $ 1,809 $ 833,086
Summary of Core Deposit Intangibles, Customer Renewal Lists and Mortgage Servicing Rights	The following table shows a summary of core deposit intangibles, customer renewal lists and mortgage servicing rights: Core Customer Mortgage Servicing Rights Total Finite- December 31, 2015 Gross carrying amount $ 111,594 $ 12,351 $ 12,766 $ 136,711 Accumulated amortization (79,362 ) (7,860 ) (3,845 ) (91,067 ) $ 32,232 $ 4,491 $ 8,921 $ 45,644 December 31, 2014 Gross carrying amount $ 108,593 $ 10,970 $ 11,691 $ 131,254 Accumulated amortization (71,818 ) (7,099 ) (4,833 ) (83,750 ) $ 36,775 $ 3,871 $ 6,858 $ 47,504
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, 2015: 2016 $ 9,229 2017 8,011 2018 6,150 2019 5,312 2020 4,962

Deposits (Tables)

Deposits (Tables)	12 Months Ended
	Dec. 31, 2015
Banking and Thrift [Abstract]
Summary of Deposits	Following is a summary of deposits: December 31 2015 2014 Non-interest-bearing demand $ 3,059,949 $ 2,647,623 Interest-bearing demand 5,311,589 4,547,628 Savings 1,786,459 1,575,922 Certificates and other time deposits 2,465,466 2,611,035 $ 12,623,463 $ 11,382,208
Time Deposits by Remaining Maturity	Following is a summary of the time deposits of $100,000 or more by remaining maturity at December 31, 2015: Certificates Other Total Three months or less $ 88,520 $ 7,973 $ 96,493 Three to six months 113,475 9,928 123,403 Six to twelve months 187,347 24,558 211,905 Over twelve months 311,127 118,114 429,241 $ 700,469 $ 160,573 $ 861,042
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, 2015: 2016 $ 1,312,627 2017 439,392 2018 197,080 2019 213,622 2020 197,573 Later years 105,172

Short-Term Borrowings (Tables)

Short-Term Borrowings (Tables)	12 Months Ended
	Dec. 31, 2015
Debt Disclosure [Abstract]
Summary of Short-Term Borrowings	Following is a summary of short-term borrowings: December 31 2015 2014 Securities sold under repurchase agreements $ 266,732 $ 882,696 Federal Home Loan Bank advances 1,090,000 820,000 Federal funds purchased 568,000 210,000 Subordinated notes 124,164 128,962 $ 2,048,896 $ 2,041,658

Long-Term Borrowings (Tables)

Long-Term Borrowings (Tables)	12 Months Ended
	Dec. 31, 2015
Debt Disclosure [Abstract]
Summary of Long-Term Borrowings	Following is a summary of long-term borrowings: December 31 2015 2014 Federal Home Loan Bank advances $ 400,017 $ 400,042 Subordinated notes 84,668 83,155 Junior subordinated debt 58,298 58,246 Other subordinated debt 98,497 — $ 641,480 $ 541,443
Junior Subordinated Debt Trusts	The following table provides information relating to the remaining Trusts as of December 31, 2015: Trust Preferred Securities Common Securities Junior Subordinated Debt Stated Maturity Date Interest Rate F.N.B. Statutory Trust II $ 21,500 $ 665 $ 22,165 6/15/36 2.16 % Variable; LIBOR + 165 basis points (bps) Omega Financial Capital Trust I 36,000 1,114 36,133 10/18/34 2.51 % Variable; LIBOR + 219 bps $ 57,500 $ 1,779 $ 58,298
Scheduled Annual Maturities of Long-Term Debt	Scheduled annual maturities for all of the long-term debt for the years following December 31, 2015 are as follows: 2016 $ 155,736 2017 168,060 2018 42,758 2019 28,293 2020 43,929 Later years 202,704

Derivative Instruments (Tables)

Derivative Instruments (Tables)	12 Months Ended
	Dec. 31, 2015
Schedule of Notional Amounts and Gross Fair Values of Derivative Assets and Derivative Liabilities	The following table presents notional amounts and gross fair values of all derivative assets and derivative liabilities held by the Corporation: December 31 2015 2014 Notional Amount Fair Value Notional Amount Fair Value Asset Liability Asset Liability Gross Derivatives Subject to master netting arrangements: Interest rate contracts – designated $ 250,000 $ 3,178 $ 962 $ 200,000 $ 2,109 $ 2,330 Interest rate swaps – not designated 1,262,964 1 50,491 972,002 140 43,655 Equity contracts – not designated 1,180 18 — 1,210 47 — Total subject to master netting arrangements 1,514,144 3,197 51,453 1,173,212 2,296 45,985 Not subject to master netting arrangements: Interest rate swaps – not designated 1,262,964 49,998 1 972,002 43,602 128 Credit risk contracts – not designated 114,753 7 133 68,632 — — Equity contracts – not designated 1,180 — 18 1,210 — 47 Total not subject to master netting arrangements 1,378,897 50,005 152 1,041,844 43,602 175 $ 2,893,041 $ 53,202 $ 51,605 $ 2,215,056 $ 45,898 $ 46,160
Derivative Liabilities	The following table presents information about derivative assets and derivative liabilities that are subject to enforceable master netting arrangements as well as those not subject to enforceable master netting arrangements: Gross Gross Net Amount December 31, 2015 Derivative Liabilities Subject to master netting arrangements: Interest rate contracts Designated $ 962 — $ 962 Not designated 50,491 — 50,491 Not subject to master netting arrangements: Interest rate contracts – not designated 1 — 1 Credit contracts – not designated 133 — 133 Equity contracts – not designated 18 — 18 $ 51,605 — $ 51,605 December 31, 2014 Derivative Liabilities Subject to master netting arrangements: Interest rate contracts Designated $ 2,330 — $ 2,330 Not designated 43,655 — 43,655 Not subject to master netting arrangements: Interest rate contracts – not designated 128 — 128 Equity contracts – not designated 47 — 47 $ 46,160 — $ 46,160
Derivative Assets	The following table presents information about derivative assets and derivative liabilities that are subject to enforceable master netting arrangements as well as those not subject to enforceable master netting arrangements: Gross Gross Net Amount December 31, 2015 Derivative Assets Subject to master netting arrangements: Interest rate contracts Designated $ 3,178 — $ 3,178 Not designated 1 — 1 Equity contracts – not designated 18 — 18 Not subject to master netting arrangements: Interest rate contracts – not designated 49,998 — 49,998 Credit contracts – not designated 7 — 7 $ 53,202 — $ 53,202 December 31, 2014 Derivative Assets Subject to master netting arrangements: Interest rate contracts Designated $ 2,109 — $ 2,109 Not designated 140 — 140 Equity contracts – not designated 47 — 47 Not subject to master netting arrangements: Interest rate contracts – not designated 43,602 — 43,602 $ 45,898 — $ 45,898
Effect of Corporation's Derivative Financial Instruments on Income Statement	The following table presents the effect of certain of the Corporation’s derivative financial instruments on the income statement: Income Statement Location Year Ended December 31, 2015 2014 Interest Rate Contracts Interest income – loans and leases $ 3,248 $ 3,314 Interest Rate Contracts Interest expense – short-term borrowings 292 — Interest Rate Swaps Other income (451 ) (123 ) Credit Risk Contracts Other income (126 ) —
Collateral Held By Counterparty [Member]
Derivative Liabilities	The following table presents 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: Amount Not Offset in the Balance Sheet Net Amount the Balance Sheet Financial Cash Net Amount December 31, 2015 Derivative Liabilities Interest rate contracts: Designated $ 962 $ 792 $ 170 $ — Not designated 50,491 24,579 24,632 1,280 $ 51,453 $ 25,371 $ 24,802 $ 1,280 December 31, 2014 Derivative Liabilities Interest rate contracts: Designated $ 2,330 $ 2,330 $ — $ — Not designated 43,655 28,646 13,243 1,766 $ 45,985 $ 30,976 $ 13,243 $ 1,766
Derivative Assets	The following table presents 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: Amount Not Offset in the Balance Sheet Net Amount the Balance Sheet Financial Cash Net Amount December 31, 2015 Derivative Assets Interest rate contracts: Designated $ 3,178 $ 1,516 $ 1,662 — Not designated 1 1 — — Equity contracts – not designated 18 18 — — $ 3,197 $ 1,535 $ 1,662 — December 31, 2014 Derivative Assets Interest rate contracts: Designated $ 2,109 $ 810 $ 1,299 — Not designated 140 138 2 — Equity contracts – not designated 47 47 — — $ 2,296 $ 995 $ 1,301 —

Commitments, Credit Risk and 45

Commitments, Credit Risk and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2015
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 2015 2014 Commitments to extend credit $ 3,781,719 $ 3,665,481 Standby letters of credit 92,979 121,186

Stock Incentive Plans (Tables)

Stock Incentive Plans (Tables)	12 Months Ended
	Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Summary of Information Concerning Restricted Stock Awards	The following table summarizes certain information concerning restricted stock awards: 2015 Weighted Average Grant 2014 Weighted Average Grant 2013 Weighted Average Grant Unvested shares outstanding at beginning of year 1,354,093 $ 11.86 1,729,033 $ 10.23 1,913,073 $ 9.17 Granted 664,337 13.25 387,165 13.50 361,664 11.10 Net adjustment due to performance 13,115 19.74 (36,600 ) 12.01 165,545 9.60 Vested (484,010 ) 10.70 (707,074 ) 8.81 (734,129 ) 7.90 Forfeited (41,130 ) 13.24 (65,399 ) 11.72 (37,828 ) 10.42 Dividend reinvestment 42,039 11.86 46,968 12.66 60,708 11.82 Unvested shares outstanding at end of year 1,548,444 12.85 1,354,093 11.86 1,729,033 10.23
Components of Restricted Stock Awards	The components of the restricted stock awards as of December 31, 2015 are as follows: Service- Awards Performance- Based Awards Total Unvested shares 632,054 916,390 1,548,444 Unrecognized compensation expense $ 3,737 $ 5,542 $ 9,279 Intrinsic value $ 8,432 $ 12,225 $ 20,657 Weighted average remaining life (in years) 1.92 2.58 2.31
Summary of Information Concerning Stock Option Awards	The following table summarizes certain information concerning stock options: 2015 Weighted Average Price per Share 2014 Weighted Average Price per Share 2013 Weighted Average Price per Share Options outstanding at beginning of year 568,834 $ 8.86 533,524 $ 11.50 640,050 $ 13.21 Assumed from acquisitions — — 805,507 7.39 274,964 11.16 Exercised (93,822 ) 5.94 (690,973 ) 7.75 (69,429 ) 7.46 Forfeited (39,672 ) 15.66 (79,224 ) 21.40 (312,061 ) 15.58 Options outstanding and exercisable at end of year 435,340 8.86 568,834 8.86 533,524 11.50
Summary of Stock Options Outstanding	The following table summarizes information about stock options outstanding at December 31, 2015: Range of Exercise Prices Options Outstanding and Exercisable Weighted Average Remaining Contractual Years Weighted Average Exercise Price $3.45 - $5.18 147,461 4.12 $ 4.74 $5.19 - $7.78 91,824 1.69 6.17 $11.69 - $17.54 190,285 1.74 12.68 $26.33 - $36.42 5,770 0.84 31.25 435,340
Summary of Stock Options Exercised	The following table summarizes certain information relating to stock options exercised: Year Ended December 31 2015 2014 2013 Proceeds from stock options exercised $ 557 $ 3,292 $ 365 Tax benefit recognized from stock options exercised 130 808 79 Intrinsic value of stock options exercised 693 3,289 318

Retirement Plans (Tables)

Retirement Plans (Tables)	12 Months Ended
	Dec. 31, 2015
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 2015 2014 Accumulated benefit obligation $ 150,754 $ 156,589 Projected benefit obligation at beginning of year $ 156,924 $ 139,731 Service cost (14 ) 62 Interest cost 5,897 6,411 Actuarial (gain) loss (3,381 ) 21,253 Benefits paid (8,411 ) (10,533 ) Projected benefit obligation at end of year $ 151,015 $ 156,924 Fair value of plan assets at beginning of year $ 140,140 $ 139,737 Actual return on plan assets (331 ) 9,613 Corporation contribution 1,364 1,323 Benefits paid (8,411 ) (10,533 ) Fair value of plan assets at end of year $ 132,762 $ 140,140 Funded status of plans $ (18,253 ) $ (16,784 )
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 2015 2014 Weighted average discount rate 4.19 % 3.85 % Rates of average increase in compensation levels 3.50 % 4.00 %
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 2015 2014 2013 Service cost $ (14 ) $ 62 $ 65 Interest cost 5,897 6,411 5,728 Expected return on plan assets (9,964 ) (9,946 ) (9,081 ) Transition amount amortization — (21 ) (93 ) Prior service credit amortization 7 7 7 Actuarial loss amortization 2,112 1,367 2,263 Net periodic pension cost (gain) (1,962 ) (2,120 ) (1,111 ) Other changes in plan assets and benefit obligations recognized in other comprehensive income: Current year actuarial loss (gain) 6,914 21,586 (20,938 ) Amortization of actuarial loss (2,112 ) (1,367 ) (2,263 ) Amortization of prior service credit (7 ) (7 ) (7 ) Amortization of transition asset — 21 93 Total recognized in other comprehensive income 4,795 20,233 (23,115 ) Total recognized in net periodic pension cost (gain) and other comprehensive income $ 2,833 $ 18,113 $ (24,226 )
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 2015 2014 2013 Weighted average discount rate 3.85 % 4.67 % 3.78 % Rates of increase in compensation levels 4.00 % 4.00 % 4.00 % Expected long-term rate of return on assets 7.25 % 7.25 % 7.25 %
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, 2015 and 2014, 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 2015 2014 2015 2014 Projected benefit obligation $ 130,797 $ 135,998 $ 20,218 $ 20,926 Accumulated benefit obligation 130,797 135,998 19,957 20,591 Fair value of plan assets 132,762 140,140 — —
Schedule of Impact of Changes in Discount Rate, Return on Plan Assets on Pension Expense	The impact of changes in the discount rate and expected long-term rate of return on plan assets would have had the following effects on 2015 pension expense: Estimated 0.5% decrease in the discount rate $ (33 ) 0.5% decrease in the expected long-term rate of return on plan assets 687
Schedule of Estimated Future Cash Flows	The following table provides information regarding estimated future cash flows relating to the Plans at December 31, 2015: Expected employer contributions: 2016 $ 1,350 Expected benefit payments: 2016 7,244 2017 9,413 2018 8,177 2019 8,433 2020 8,731 2021 – 2025 45,879
Schedule of Asset Allocations for Pension Plans	The following table presents asset allocations for the Corporation’s pension plans as of December 31, 2015 and 2014, and the target allocation for 2016, by asset category: Target Percentage of Plan Assets December 31 2016 2015 2014 Asset Category Equity securities 45 - 65 % 57 % 57 % Debt securities 30 - 50 39 40 Cash equivalents 0 - 10 4 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, 2015 Asset Class Cash $ 4,847 $ — — $ 4,847 Equity securities: F.N.B. Corporation 7,672 — — 7,672 Other large-cap U.S. financial services companies 2,541 — — 2,541 Other large-cap U.S. companies 33,387 — — 33,387 International companies 521 — — 521 Other equity 596 — — 596 Mutual fund equity investments: U.S. equity index funds: U.S. large-cap equity index funds 511 — — 511 U.S. small-cap equity index funds 2,607 — — 2,607 U.S. mid-cap equity index funds 3,464 — — 3,464 Non-U.S. equities growth fund 9,613 — — 9,613 U.S. equity funds: U.S. mid-cap 6,989 — — 6,989 U.S. small-cap 2,679 — — 2,679 Other 5,540 — — 5,540 Fixed income securities: U.S. government agencies — 40,735 — 40,735 Fixed income mutual funds: U.S. investment-grade fixed income securities 10,648 — — 10,648 Non-U.S. fixed income securities 412 — — 412 $ 92,027 $ 40,735 — $ 132,762 December 31, 2014 Asset Class Cash $ 3,970 $ — — $ 3,970 Equity securities: F.N.B. Corporation 7,661 — — 7,661 Other large-cap U.S. financial services companies 2,653 — — 2,653 Other large-cap U.S. companies 34,286 — — 34,286 International companies 730 — — 730 Other equity 583 — — 583 Mutual fund equity investments: U.S. equity index funds: U.S. large-cap equity index funds 1,504 — — 1,504 U.S. small-cap equity index funds 2,946 — — 2,946 U.S. mid-cap equity index funds 3,803 — — 3,803 Non-U.S. equities growth fund 9,986 — — 9,986 U.S. equity funds: U.S. mid-cap 7,501 — — 7,501 U.S. small-cap 3,019 — — 3,019 Other 5,643 — — 5,643 Fixed income securities: U.S. government agencies — 44,417 — 44,417 Fixed income mutual funds: U.S. investment-grade fixed income securities 10,993 — — 10,993 Non-U.S. fixed income securities 445 — — 445 $ 95,723 $ 44,417 — $ 140,140

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2015
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 2015 2014 2013 Current income taxes: Federal taxes $ 69,572 $ 18,111 $ 33,614 State taxes 989 396 (116 ) 70,561 18,507 33,498 Deferred income taxes: Federal taxes 63 44,113 11,258 State taxes (631 ) — — (568 ) 44,113 11,258 $ 69,993 $ 62,620 $ 44,756
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 2015 2014 Deferred tax assets: Allowance for credit losses $ 50,414 $ 44,613 Discount on purchased loans 28,503 31,787 Net operating loss/tax credit carryforwards 16,487 15,367 Deferred compensation 8,515 7,785 Securities impairments 252 412 Pension and other defined benefit plans 8,539 6,871 Net unrealized securities losses 1,301 — Other 8,020 9,503 Total 122,031 116,338 Valuation allowance (17,179 ) (15,505 ) Total deferred tax assets 104,852 100,833 Deferred tax liabilities: Loan costs (2,966 ) (1,497 ) Depreciation (10,836 ) (11,533 ) Prepaid expenses (628 ) (705 ) Amortizable intangibles (12,940 ) (13,842 ) Lease financing (6,763 ) (7,302 ) Debt discharge income deferral (2,042 ) (2,829 ) Originated mortgage servicing rights (1,238 ) (2,721 ) Other (1,928 ) — Total deferred tax liabilities (39,341 ) (40,429 ) Net deferred tax assets $ 65,511 $ 60,404
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 2015 2014 2013 Statutory tax rate 35.0 % 35.0 % 35.0 % State taxes, net of federal benefit 0.8 0.1 0.2 Valuation allowance reversal (0.8 ) — — Tax-exempt interest (2.2 ) (1.8 ) (2.9 ) Cash surrender value of life insurance (1.3 ) (1.3 ) (1.8 ) Tax credits (1.1 ) (1.4 ) (2.4 ) Other items 0.1 (0.3 ) (0.6 ) Actual effective tax rate 30.5 % 30.3 % 27.5 %
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 2015 2014 Balance at beginning of year $ 401 $ 660 Additions based on tax positions related to current year 134 60 Additions based on tax positions of prior year — — Reductions for tax positions of prior years — — Reductions due to expiration of statute of limitations (80 ) (319 ) Balance at end of year $ 455 $ 401

Comprehensive Income (Tables)

Comprehensive Income (Tables)	12 Months Ended
	Dec. 31, 2015
Equity [Abstract]
Changes in AOCI, Net of Tax, by Component	The following table presents changes in AOCI, net of tax, by component: Year Ended December 31, 2015 Unrealized Net Gains (Losses) on Securities Available for Sale Unrealized Losses on Derivative Instruments Unrecognized Postretirement Obligations Total Balance at beginning of period $ (440 ) $ (143 ) $ (45,420 ) $ (46,003 ) Other comprehensive income (loss) before reclassifications (2,899 ) 3,694 (3,280 ) (2,485 ) Amounts reclassified from AOCI (534 ) (2,111 ) — (2,645 ) Net current period other comprehensive income (loss) (3,433 ) 1,583 (3,280 ) (5,130 ) Balance at end of period $ (3,873 ) $ 1,440 $ (48,700 ) $ (51,133 )

Earnings per Share (Tables)

Earnings per Share (Tables)	12 Months Ended
	Dec. 31, 2015
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 2015 2014 2013 Net income $ 159,649 $ 144,050 $ 117,804 Less: Preferred stock dividends 8,041 8,352 — Net income available to common stockholders $ 151,608 $ 135,698 $ 117,804 Basic weighted average common shares outstanding 174,971,785 167,347,906 146,186,982 Net effect of dilutive stock options, warrants, restricted stock and convertible debt 1,367,168 1,730,939 1,622,522 Diluted weighted average common shares outstanding 176,338,953 169,078,845 147,809,504 Basic earnings per common share $ 0.87 $ 0.81 $ 0.81 Diluted earnings per common share $ 0.86 $ 0.80 $ 0.80

Regulatory Matters (Tables)

Regulatory Matters (Tables)	12 Months Ended
	Dec. 31, 2015
Banking and Thrift [Abstract]
Schedule of Capital Ratios	Following are the capital ratios as of December 31, 2015 and 2014 for the Corporation and FNBPA (dollars in thousands): Actual Well-Capitalized Requirements Minimum Capital Requirements December 31, 2015 Amount Ratio Amount Ratio Amount Ratio F.N.B. Corporation: Total capital $ 1,629,270 12.9 % $ 1,268,396 10.0 % $ 1,014,717 8.0 % Tier 1 capital 1,321,972 10.4 1,014,717 8.0 761,038 6.0 Common equity tier 1 1,200,715 9.5 824,457 6.5 570,778 4.5 Leverage 1,321,972 8.1 811,553 5.0 649,243 4.0 FNBPA: Total capital 1,426,284 11.3 1,265,990 10.0 1,012,792 8.0 Tier 1 capital 1,289,965 10.2 1,012,792 8.0 759,594 6.0 Common equity tier 1 1,209,965 9.6 822,893 6.5 569,695 4.5 Leverage 1,289,965 8.0 803,041 5.0 642,433 4.0 December 31, 2014 F.N.B. Corporation: Total capital $ 1,417,369 12.4 % $ 1,146,556 10.0 % $ 917,245 8.0 % Tier 1 capital 1,269,033 11.1 687,934 6.0 458,623 4.0 Leverage 1,269,033 8.4 752,593 5.0 602,074 4.0 FNBPA: Total capital 1,321,433 11.5 1,147,427 10.0 917,941 8.0 Tier 1 capital 1,200,776 10.5 688,456 6.0 458,971 4.0 Leverage 1,200,776 8.1 744,235 5.0 595,388 4.0

Cash Flow Information (Tables)

Cash Flow Information (Tables)	12 Months Ended
	Dec. 31, 2015
Supplemental Cash Flow Elements [Abstract]
Summary of Cash Flow Information	Following is a summary of cash flow information: Year Ended December 31 2015 2014 2013 Interest paid on deposits and other borrowings $ 47,805 $ 43,057 $ 46,337 Income taxes paid 61,500 27,000 34,200 Transfers of loans to other real estate owned 9,628 16,535 15,836 Transfers of other real estate owned to loans 372 390 701

Business Segments (Tables)

Business Segments (Tables)	12 Months Ended
	Dec. 31, 2015
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 Manage- ment Insurance Consumer Parent and Consolidated At or for the Year Ended December 31, 2015 Interest income $ 500,030 $ — $ 89 $ 39,868 $ 6,808 $ 546,795 Interest expense 41,227 — — 3,518 3,828 48,573 Net interest income 458,803 — 89 36,350 2,980 498,222 Provision for credit losses 32,125 — — 7,396 920 40,441 Non-interest income 116,141 35,246 13,052 2,926 (4,955 ) 162,410 Non-interest expense 319,923 27,264 13,891 20,189 977 382,244 Intangible amortization 7,544 273 488 — — 8,305 Income tax expense (benefit) 65,071 2,803 (412 ) 4,709 (2,178 ) 69,993 Net income (loss) 150,281 4,906 (826 ) 6,982 (1,694 ) 159,649 Total assets 17,374,384 20,753 22,207 195,048 (54,730 ) 17,557,662 Total intangibles 853,551 10,447 12,923 1,809 — 878,730 At or for the Year Ended December 31, 2014 Interest income $ 463,376 $ — $ 98 $ 38,914 $ 6,595 $ 508,983 Interest expense 36,318 — — 3,352 3,016 42,686 Net interest income 427,058 — 98 35,562 3,579 466,297 Provision for credit losses 30,872 — — 6,920 856 38,648 Non-interest income 115,858 31,497 13,598 2,919 (5,598 ) 158,274 Non-interest expense 311,834 25,338 11,558 19,692 1,114 369,536 Intangible amortization 9,025 288 404 — — 9,717 Income tax expense (benefit) 57,634 2,135 625 4,430 (2,204 ) 62,620 Net income (loss) 133,551 3,736 1,109 7,439 (1,785 ) 144,050 Total assets 15,944,040 20,877 19,222 187,796 (44,845 ) 16,127,090 Total intangibles 857,066 10,720 10,122 1,809 — 879,717 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 credit 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

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2015
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, 2015 Assets measured at fair value Available for sale debt securities U.S. Treasury $ — $ 29,796 $ — $ 29,796 U.S. government-sponsored entities — 367,994 — 367,994 Residential mortgage-backed securities Agency mortgage-backed securities — 704,831 — 704,831 Agency collateralized mortgage obligations — 495,830 — 495,830 Non-agency collateralized mortgage obligations — 6 1,184 1,190 Commercial mortgage-backed securities — 4,287 — 4,287 States of the U.S. and political subdivisions — 11,057 — 11,057 Other debt securities — 14,286 — 14,286 — 1,628,087 1,184 1,629,271 Available for sale equity securities Financial services industry 97 632 439 1,168 Insurance services industry 128 — — 128 225 632 439 1,296 225 1,628,719 1,623 1,630,567 Derivative financial instruments Trading — 50,017 — 50,017 Not for trading — 3,185 — 3,185 — 53,202 — 53,202 $ 225 $ 1,681,921 $ 1,623 $ 1,683,769 Liabilities measured at fair value Derivative financial instruments Trading — $ 50,510 — $ 50,510 Not for trading — 1,095 — 1,095 — $ 51,605 — $ 51,605 Level 1 Level 2 Level 3 Total December 31, 2014 Assets measured at fair value Available for sale debt securities U.S. Treasury $ — $ 29,682 $ — $ 29,682 U.S. government-sponsored entities — 337,133 — 337,133 Residential mortgage-backed securities Agency mortgage-backed securities — 554,085 — 554,085 Agency collateralized mortgage obligations — 573,171 — 573,171 Non-agency collateralized mortgage obligations — 11 1,420 1,431 Commercial mortgage-backed securities — 7,880 — 7,880 States of the U.S. and political subdivisions — 13,158 — 13,158 Other debt securities — 16,178 — 16,178 — 1,531,298 1,420 1,532,718 Available for sale equity securities Financial services industry 99 654 475 1,228 Insurance services industry 119 — — 119 218 654 475 1,347 218 1,531,952 1,895 1,534,065 Derivative financial instruments Trading — 43,789 — 43,789 Not for trading — 2,109 — 2,109 — 45,898 — 45,898 $ 218 $ 1,577,850 $ 1,895 $ 1,579,963 Liabilities measured at fair value Derivative financial instruments Trading — $ 43,830 — $ 43,830 Not for trading — 2,330 — 2,330 — $ 46,160 — $ 46,160
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 Debt Obligations Equity Residential Non-Agency Collateralized Mortgage Obligations Total Year Ended December 31, 2015 Balance at beginning of period — $ 475 $ 1,420 $ 1,895 Total gains (losses) – realized/unrealized: Included in earnings — — — — Included in other comprehensive income — 20 (4 ) 16 Accretion included in earnings — — 5 5 Purchases, issuances, sales and settlements: Purchases — — — — Issuances — — — — Sales/redemptions — — — — Settlements — — (237 ) (237 ) Transfers from Level 3 — (56 ) — (56 ) Transfers into Level 3 — — — — Balance at end of period — $ 439 $ 1,184 $ 1,623 Year Ended December 31, 2014 Balance at beginning of period $ 31,595 $ 410 $ 1,744 $ 33,749 Total gains (losses) – realized/unrealized: Included in earnings 13,766 — — 13,766 Included in other comprehensive income 5,608 65 3 5,676 Accretion included in earnings 657 — 5 662 Purchases, issuances, sales and settlements: Purchases — — — — Issuances — — — — Sales/redemptions (51,527 ) — — (51,527 ) Settlements (99 ) — (332 ) (431 ) Transfers from Level 3 — — — — Transfers into Level 3 — — — — Balance at end of period $ — $ 475 $ 1,420 $ 1,895
Additional Information about Assets Measured at Fair Value on Non-Recurring Basis	For assets measured at fair value on a non-recurring basis still held at the balance sheet date, the following table provides the hierarchy level and the fair value of the related assets or portfolios: Level 1 Level 2 Level 3 Total December 31, 2015 Impaired loans — $ 124 $ 3,704 $ 3,828 Other real estate owned — 5,705 2,126 7,831 December 31, 2014 Impaired loans — $ 177 $ 1,528 $ 1,705 Other real estate owned — 5,695 2,365 8,060
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 December 31, 2015 Financial Assets Cash and cash equivalents $ 489,119 $ 489,119 $ 489,119 $ — $ — Securities available for sale 1,630,567 1,630,567 225 1,628,719 1,623 Securities held to maturity 1,637,061 1,643,416 — 1,640,721 2,695 Net loans, including loans held for sale 12,053,209 11,863,882 — — 11,863,882 Derivative assets 53,202 53,202 — 53,202 — Accrued interest receivable 44,920 44,920 44,920 — — Financial Liabilities Deposits 12,623,463 12,610,914 10,157,997 2,452,917 — Short-term borrowings 2,048,896 2,048,943 2,048,943 — — Long-term borrowings 641,480 637,935 — — 637,935 Derivative liabilities 51,605 51,605 — 51,605 — Accrued interest payable 7,457 7,457 7,457 — — December 31, 2014 Financial Assets Cash and cash equivalents $ 287,393 $ 287,393 $ 287,393 $ — $ — Securities available for sale 1,534,065 1,534,065 218 1,531,952 1,895 Securities held to maturity 1,453,355 1,468,258 — 1,463,945 4,313 Net loans, including loans held for sale 11,127,292 10,956,544 — — 10,956,544 Derivative assets 45,898 45,898 — 45,898 — Accrued interest receivable 40,231 40,231 40,231 — — Financial Liabilities Deposits 11,382,208 11,382,402 8,771,173 2,611,229 — Short-term borrowings 2,041,658 2,041,672 2,041,672 — — Long-term borrowings 541,443 539,007 — — 539,007 Derivative liabilities 46,160 46,160 — 46,160 — Accrued interest payable 6,689 6,689 6,689 — —

Parent Company Financial Stat55

Parent Company Financial Statements (Tables)	12 Months Ended
	Dec. 31, 2015
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Consolidated Balance Sheet of Parent Company Only	Balance Sheets December 31 2015 2014 Assets Cash and cash equivalents $ 227,554 $ 129,320 Securities available for sale 1,168 1,228 Other assets 17,206 16,615 Investment in bank subsidiary 2,073,352 2,006,808 Investments in and advances to non-bank subsidiaries 260,341 254,653 Total Assets $ 2,579,621 $ 2,408,624 Liabilities Other liabilities $ 26,831 $ 25,772 Advances from affiliates 289,540 292,337 Long-term borrowings 157,777 59,279 Subordinated notes: Short-term 8,216 8,351 Long-term 1,075 1,429 Total Liabilities 483,439 387,168 Stockholders’ Equity 2,096,182 2,021,456 Total Liabilities and Stockholders’ Equity $ 2,579,621 $ 2,408,624
Statements of Income of Parent Company Only	Statements of Income Year Ended December 31 2015 2014 2013 Income Dividend income from subsidiaries: Bank $ 87,580 $ 85,000 $ 77,153 Non-bank 7,863 9,900 5,950 95,443 94,900 83,103 Interest income 4,845 4,856 5,277 Other income 1,053 1,920 1,874 Total Income 101,341 101,676 90,254 Expenses Interest expense 9,526 8,503 14,325 Other expenses 8,993 9,252 8,196 Total Expenses 18,519 17,755 22,521 Income Before Taxes and Equity in Undistributed Income of Subsidiaries 82,822 83,921 67,733 Income tax benefit 5,088 4,498 6,267 87,910 88,419 74,000 Equity in undistributed income (loss) of subsidiaries: Bank 71,581 55,742 42,094 Non-bank 158 (111 ) 1,710 Net Income $ 159,649 $ 144,050 $ 117,804
Statements of Cash Flows of Parent Company Only	Statements of Cash Flows Year Ended December 31 2015 2014 2013 Operating Activities Net income $ 159,649 $ 144,050 $ 117,804 Adjustments to reconcile net income to net cash flows from operating activities: Undistributed earnings from subsidiaries (71,739 ) (55,631 ) (43,804 ) Other, net 680 (637 ) (6,218 ) Net cash flows provided by operating activities 88,590 87,782 67,782 Investing Activities Proceeds from sale of securities available for sale — 934 128 Net decrease in advances to subsidiaries 3,285 2,018 1,080 Net (increase) decrease in investment in subsidiaries (9,060 ) (2,877 ) 1,845 Net cash received (paid) in business combinations — 5,594 (3,533 ) Net cash flows (used in) provided by investing activities (5,775 ) 5,669 (480 ) Financing Activities Net decrease in advance from affiliate (2,797 ) (1,908 ) (854 ) Net (decrease) increase in short-term borrowings (135 ) (88 ) 84 Decrease in long-term debt (650 ) (34,865 ) (134,829 ) Increase in long-term debt 98,794 821 499 Net proceeds from issuance of preferred stock — — 106,882 Net proceeds from issuance of common stock 12,731 12,857 62,092 Tax benefit of stock-based compensation 28 2,714 1,326 Cash dividends paid: Preferred stock (8,041 ) (8,352 ) — Common stock (84,511 ) (81,220 ) (71,246 ) Net cash flows provided by (used in) financing activities 15,419 (110,041 ) (36,046 ) Net Increase (Decrease) in Cash and Cash Equivalents 98,234 (16,590 ) 31,256 Cash and cash equivalents at beginning of year 129,320 145,910 114,654 Cash and Cash Equivalents at End of Year $ 227,554 $ 129,320 $ 145,910 Cash paid during the year for: Interest $ 8,309 $ 9,112 $ 14,351

Nature of Operations (Additiona

Nature of Operations (Additional Information) (Detail)	12 Months Ended
	Dec. 31, 2015StateOfficeLocation
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of states, Company operating financial services | State	6
Number of metropolitan areas, Company operating financial services | Location	3
Number of consumer finance offices	76
Number of banking offices	288

Summary of Significant Accoun57

Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)
Summary Of Significant Accounting Policies [Line Items]
Minimum corporation reserves for commercial loan	$ 500
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	Greater than 50%
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	8 years
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Useful life of the asset, years	40 years
Estimated useful life of intangibles, years	13 years

New Accounting Standards - Addi

New Accounting Standards - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2015	Oct. 02, 2015
New Accounting Pronouncement, Early Adoption [Line Items]
Deferred debt issuance costs		$ 1,500,000
Long-term borrowings	$ 541,443,000	$ 641,480,000
Debt issuance costs	$ 0
Subordinated Notes [Member]
New Accounting Pronouncement, Early Adoption [Line Items]
Long-term borrowings			$ 100,000,000

Mergers and Acquisitions - Addi

Mergers and Acquisitions - Additional Information (Detail) $ / shares in Units, $ in Thousands	Feb. 13, 2016USD ($)shares	Sep. 18, 2015USD ($)Branch	Sep. 03, 2015USD ($)Branch	Jul. 18, 2015USD ($)	Jun. 22, 2015USD ($)	Sep. 19, 2014USD ($)shares	Feb. 15, 2014USD ($)shares	Oct. 12, 2013USD ($)shares	Apr. 06, 2013USD ($)$ / sharesshares	Dec. 31, 2015USD ($)$ / sharesshares	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)
Business Acquisition [Line Items]
Merger expenses incurred on acquisition										$ 3,033	$ 9,611	$ 8,210
Goodwill recorded as a result of merger										$ 833,086	$ 832,213	$ 764,248
Bank of America [Member]
Business Acquisition [Line Items]
Assets acquired as a result of merger		$ 154,619
Loans acquired as a result of merger		842
Deposits acquired as a result of merger		$ 154,619
Number of branch-banking locations acquired | Branch		5
Cash acquired as a result of merger		$ 148,159
Goodwill and intangible assets acquired as a result of merger		4,485
Fixed and other assets acquired as a result of merger		$ 1,975
Percentage of premium on acquired loan		1.94%
Goodwill deductible for tax purposes		$ 1,485
Other assets recorded as a result of merger		$ 1,133
OBA Financial Services, Inc. (OBA) [Member]
Business Acquisition [Line Items]
Assets acquired as a result of merger						$ 390,160
Loans acquired as a result of merger						291,393
Deposits acquired as a result of merger						295,922
Value of acquisition						$ 85,554
Common shares issued | shares						7,170,037
Common shares acquired | shares						4,025,895
Cash acquired as a result of merger						$ 32,913
Goodwill recorded as a result of merger						20,107
Other assets recorded as a result of merger						21,659
Core deposit intangibles recorded as result of the acquisition						$ 4,304
BCSB Bancorp, Inc. (BCSB) [Member]
Business Acquisition [Line Items]
Assets acquired as a result of merger							$ 596,122
Loans acquired as a result of merger							304,932
Deposits acquired as a result of merger							532,197
Value of acquisition							$ 80,547
Common shares issued | shares							6,730,597
Common shares acquired | shares							3,235,961
Cash acquired as a result of merger							$ 26,980
Goodwill recorded as a result of merger							42,452
Other assets recorded as a result of merger							49,081
Core deposit intangibles recorded as result of the acquisition							$ 6,591
PVF Capital Corp. (PVF) [Member]
Business Acquisition [Line Items]
Assets acquired as a result of merger								$ 737,229
Loans acquired as a result of merger								512,795
Deposits acquired as a result of merger								628,019
Value of acquisition								$ 109,856
Common shares issued | shares								8,893,598
Common shares acquired | shares								26,119,398
Cash acquired as a result of merger								$ 99,738
Goodwill recorded as a result of merger								55,727
Other assets recorded as a result of merger								62,150
Core deposit intangibles recorded as result of the acquisition								$ 6,867
Annapolis Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Assets acquired as a result of merger									$ 430,252
Loans acquired as a result of merger									256,212
Deposits acquired as a result of merger									349,370
Value of acquisition									$ 56,300
Common shares issued | shares									4,641,412
Common shares acquired | shares									4,060,802
Cash acquired as a result of merger									$ 41,986
Goodwill recorded as a result of merger									35,854
Other assets recorded as a result of merger									28,970
Core deposit intangibles recorded as result of the acquisition									3,775
Contingent cash payment due to collection of loan									$ 609
Contingent cash payment due to collection of loan, per share | $ / shares									$ 0.15
Warrants converted to purchase common stock | shares									342,564	364,843
Warrant expiration date									Jan. 30, 2019
Warrant exercise price | $ / shares									$ 3.57	$ 3.38
Metro Bancorp Inc [Member]
Business Acquisition [Line Items]
Merger expenses incurred on acquisition										$ 1,260
Metro Bancorp Inc [Member] | Subsequent Event [Member]
Business Acquisition [Line Items]
Assets acquired as a result of merger	$ 2,854,896
Loans acquired as a result of merger	1,980,790
Deposits acquired as a result of merger	2,326,313
Value of acquisition	$ 402,990
Common shares issued | shares	34,041,181
Common shares acquired | shares	14,345,319
Conway E&S,Inc [Member]
Business Acquisition [Line Items]
Payments to acquire businesses, cash paid				$ 464
Goodwill recorded as a result of merger				269
Other intangibles recorded as a result of merger				$ 195
First Niagara Risk Management Inc [Member]
Business Acquisition [Line Items]
Payments to acquire businesses, cash paid					$ 3,066
Goodwill recorded as a result of merger					1,639
Other intangibles recorded as a result of merger					1,186
Other assets recorded as a result of merger					$ 241
Fifth Third Bank [Member]
Business Acquisition [Line Items]
Deposits acquired as a result of merger			$ 383,000
Number of branch-banking locations acquired | Branch			17

Mergers and Acquisitions - Busi

Mergers and Acquisitions - Business Acquisition Pro Forma Information (Detail) - Metro Bancorp Inc [Member] $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)$ / shares
Business Acquisition Pro Forma Information [Line Items]
Revenue (net interest income and non-interest income)	$ 790,391
Net income	171,850
Net income available to common stockholders	$ 163,809
Earnings per common share - basic | $ / shares	$ 0.78
Earnings per common share - diluted | $ / shares	$ 0.78

Mergers and Acquisitions - Amou

Mergers and Acquisitions - Amounts Recorded on Consolidated Balance Sheet in Conjunction with Acquisition (Detail) - USD ($) $ in Thousands	Sep. 19, 2014	Feb. 15, 2014	Oct. 12, 2013	Apr. 06, 2013	Sep. 18, 2015	Dec. 31, 2014
Bank of America [Member]
Business Acquisition [Line Items]
Cash and cash equivalents					$ 148,159
Loans					842
Other intangible assets					3,000
Other assets					1,133
Total identifiable assets acquired					154,619
Deposits					154,619
Total liabilities assumed					154,619
Fair value of net identifiable assets acquired					(1,485)
Goodwill recognized					$ 1,485
OBA Financial Services, Inc. (OBA) [Member]
Business Acquisition [Line Items]
Common stock issued, net of offering costs	$ 85,554
Total consideration paid	85,554
Cash and cash equivalents	32,913
Securities	39,891
Loans	291,393
Other intangible assets	4,304
Other assets	21,659
Total identifiable assets acquired	390,160
Deposits	295,922
Borrowings	27,602
Other liabilities	1,189
Total liabilities assumed	324,713
Fair value of net identifiable assets acquired	65,447
Goodwill recognized	$ 20,107
BCSB Bancorp, Inc. (BCSB) [Member]
Business Acquisition [Line Items]
Common stock issued, net of offering costs		$ 80,547
Total consideration paid		80,547
Cash and cash equivalents		26,980
Securities		208,538
Loans		304,932
Other intangible assets		6,591
Other assets		49,081
Total identifiable assets acquired		596,122
Deposits		532,197
Borrowings		17,011				$ 16,500
Other liabilities		8,819
Total liabilities assumed		558,027
Fair value of net identifiable assets acquired		38,095
Goodwill recognized		$ 42,452
PVF Capital Corp. (PVF) [Member]
Business Acquisition [Line Items]
Common stock issued, net of offering costs			$ 109,856
Total consideration paid			109,856
Cash and cash equivalents			99,738
Securities			47,258
Loans			512,795
Other intangible assets			15,288
Other assets			62,150
Total identifiable assets acquired			737,229
Deposits			628,019
Borrowings			37,241
Other liabilities			17,840
Total liabilities assumed			683,100
Fair value of net identifiable assets acquired			54,129
Goodwill recognized			$ 55,727
Annapolis Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Common stock issued, net of offering costs				$ 54,065
Warrant assumed				2,235
Total consideration paid				56,300
Cash and cash equivalents				41,986
Securities				99,309
Loans				256,212
Other intangible assets				3,775
Other assets				28,970
Total identifiable assets acquired				430,252
Deposits				349,370
Borrowings				58,204
Other liabilities				2,232
Total liabilities assumed				409,806
Fair value of net identifiable assets acquired				20,446
Goodwill recognized				$ 35,854

Securities - Schedule of Amorti

Securities - Schedule of Amortized Cost and Fair Value of Securities Available for Sale (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Securities Available For Sale, Amortized Cost	$ 1,636,526	$ 1,534,771	$ 1,169,482
Securities Available For Sale, Gross Unrealized Gains	7,394	11,215	11,463
Securities Available For Sale, Gross Unrealized Losses	(13,353)	(11,921)	(39,295)
Securities Available For Sale, Fair Value	1,630,567	1,534,065	1,141,650
U.S. Treasury [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available For Sale, Amortized Cost	29,738	29,604
Securities Available For Sale, Gross Unrealized Gains	58	78
Securities Available For Sale, Fair Value	29,796	29,682
U.S. Government-Sponsored Entities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available For Sale, Amortized Cost	368,463	338,330	336,763
Securities Available For Sale, Gross Unrealized Gains	856	742	126
Securities Available For Sale, Gross Unrealized Losses	(1,325)	(1,939)	(5,904)
Securities Available For Sale, Fair Value	367,994	337,133	330,985
Agency Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available For Sale, Amortized Cost	703,069	546,572	247,880
Securities Available For Sale, Gross Unrealized Gains	4,594	7,548	4,304
Securities Available For Sale, Gross Unrealized Losses	(2,832)	(35)	(1,303)
Securities Available For Sale, Fair Value	704,831	554,085	250,881
Securities Available For Sale, Fair Value	704,831
Agency Collateralized Mortgage Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available For Sale, Amortized Cost	503,328	580,601	511,098
Securities Available For Sale, Gross Unrealized Gains	1,032	1,617	895
Securities Available For Sale, Gross Unrealized Losses	(8,530)	(9,047)	(20,794)
Securities Available For Sale, Fair Value	495,830	573,171	491,199
Securities Available For Sale, Fair Value	495,830
Non-Agency Collateralized Mortgage Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available For Sale, Amortized Cost	1,177	1,414	1,747
Securities Available For Sale, Gross Unrealized Gains	13	17	15
Securities Available For Sale, Fair Value	1,190	1,431	1,762
Securities Available For Sale, Fair Value	1,190
Commercial Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available For Sale, Amortized Cost	4,299	7,891
Securities Available For Sale, Gross Unrealized Losses	(12)	(11)
Securities Available For Sale, Fair Value	4,287	7,880
Securities Available For Sale, Fair Value	4,287
States of the U.S. and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available For Sale, Amortized Cost	10,748	12,713	16,842
Securities Available For Sale, Gross Unrealized Gains	309	477	410
Securities Available For Sale, Gross Unrealized Losses		(32)	(250)
Securities Available For Sale, Fair Value	11,057	13,158	17,002
Collateralized Debt Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available For Sale, Amortized Cost			37,203
Securities Available For Sale, Gross Unrealized Gains			4,507
Securities Available For Sale, Gross Unrealized Losses			(10,115)
Securities Available For Sale, Fair Value			31,595
Other Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available For Sale, Amortized Cost	14,729	16,615	16,505
Securities Available For Sale, Gross Unrealized Gains	208	420	524
Securities Available For Sale, Gross Unrealized Losses	(651)	(857)	(929)
Securities Available For Sale, Fair Value	14,286	16,178	16,100
Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available For Sale, Amortized Cost	1,635,551	1,533,740	1,168,038
Securities Available For Sale, Gross Unrealized Gains	7,070	10,899	10,781
Securities Available For Sale, Gross Unrealized Losses	(13,350)	(11,921)	(39,295)
Securities Available For Sale, Fair Value	1,629,271	1,532,718	1,139,524
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available For Sale, Amortized Cost	975	1,031	1,444
Securities Available For Sale, Gross Unrealized Gains	324	316	682
Securities Available For Sale, Gross Unrealized Losses	(3)
Securities Available For Sale, Fair Value	1,296	$ 1,347	$ 2,126
Securities Available For Sale, Fair Value	$ 1,296

Securities - Schedule of Amor63

Securities - Schedule of Amortized Cost and Fair Value of Securities Held to Maturity (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Investment Securities Held To Maturity [Line Items]
Securities Held To Maturity, Amortized Cost	$ 1,637,061	$ 1,453,355	$ 1,199,169
Securities Held To Maturity, Gross Unrealized Gains	15,943	23,145	15,484
Securities Held To Maturity, Gross Unrealized Losses	(9,588)	(8,242)	(25,090)
Securities held to maturity, fair value	1,643,416	1,468,258	1,189,563
U.S. Treasury [Member]
Investment Securities Held To Maturity [Line Items]
Securities Held To Maturity, Amortized Cost	500	502	503
Securities Held To Maturity, Gross Unrealized Gains	153	168	99
Securities held to maturity, fair value	653	670	602
U.S. Government-Sponsored Entities [Member]
Investment Securities Held To Maturity [Line Items]
Securities Held To Maturity, Amortized Cost	137,385	101,602	43,322
Securities Held To Maturity, Gross Unrealized Gains	809	885	180
Securities Held To Maturity, Gross Unrealized Losses	(395)	(524)	(1,151)
Securities held to maturity, fair value	137,799	101,963	42,351
Agency Mortgage-Backed Securities [Member]
Investment Securities Held To Maturity [Line Items]
Securities Held To Maturity, Amortized Cost	709,970	677,169	628,681
Securities Held To Maturity, Gross Unrealized Gains	9,858	16,712	12,281
Securities Held To Maturity, Gross Unrealized Losses	(1,176)	(346)	(6,032)
Securities held to maturity, fair value	718,652	693,535	634,930
Agency Collateralized Mortgage Obligations [Member]
Investment Securities Held To Maturity [Line Items]
Securities Held To Maturity, Amortized Cost	499,694	501,965	385,408
Securities Held To Maturity, Gross Unrealized Gains	803	1,858	764
Securities Held To Maturity, Gross Unrealized Losses	(7,657)	(7,329)	(15,844)
Securities held to maturity, fair value	492,840	496,494	370,328
Non-Agency Collateralized Mortgage Obligations [Member]
Investment Securities Held To Maturity [Line Items]
Securities Held To Maturity, Amortized Cost	2,681	4,285	6,852
Securities Held To Maturity, Gross Unrealized Gains	14	28	44
Securities Held To Maturity, Gross Unrealized Losses			(4)
Securities held to maturity, fair value	2,695	4,313	6,892
Commercial Mortgage-Backed Securities [Member]
Investment Securities Held To Maturity [Line Items]
Securities Held To Maturity, Amortized Cost	51,258	17,560	2,241
Securities Held To Maturity, Gross Unrealized Gains	115	179	124
Securities Held To Maturity, Gross Unrealized Losses	(259)		(37)
Securities held to maturity, fair value	51,114	17,739	2,328
States of the U.S. and Political Subdivisions [Member]
Investment Securities Held To Maturity [Line Items]
Securities Held To Maturity, Amortized Cost	235,573	150,272	132,162
Securities Held To Maturity, Gross Unrealized Gains	4,191	3,315	1,992
Securities Held To Maturity, Gross Unrealized Losses	(101)	(43)	(2,022)
Securities held to maturity, fair value	$ 239,663	$ 153,544	$ 132,132

Securities - Gross Gains and Gr

Securities - Gross Gains and Gross Losses Realized on Sales of Securities (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]
Gross gains	$ 831	$ 20,241	$ 1,200
Gross losses	(9)	(8,524)	(392)
Total	$ 822	$ 11,717	$ 808

Securities - Additional Informa

Securities - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2015USD ($)Security	Dec. 31, 2014USD ($)Securities	Dec. 31, 2013USD ($)
Schedule Of Securities [Line Items]
Number of pooled issue securities | Securities		23
Net proceeds from sale of securities	$ 33,499,000	$ 175,872,000	$ 22,047,000
Net securities (losses) gains	822,000	11,717,000	808,000
Securities pledged to secure public deposits, trust deposits and for other purposes, carrying value	1,728,939,000	1,036,380,000
Securities pledged as collateral for short-term borrowings, carrying value	$ 272,629,000	892,647,000
Number of single-issuer securities | Security	3
Estimated fair value of single-issue trust preferred securities	$ 4,896,000
Amortized cost of single-issue trust preferred securities	4,245,000
Impairment losses on securities	0	0	$ 27,000
Municipal bond portfolio, value	$ 246,630,000
Percentage of formal credit enhancement insurance of municipalities	81.00%
Municipal Bonds [Member] | Weighted Average [Member]
Schedule Of Securities [Line Items]
Average holding size of securities in bond portfolio	$ 1,561,000
Municipal Bonds [Member] | Credit Concentration Risk [Member] | General Obligation Bonds [Member]
Schedule Of Securities [Line Items]
Percentage of portfolio	99.80%
Municipal Bonds [Member] | Credit Concentration Risk [Member] | General Obligation Bonds [Member] | A Rating [Member] | Minimum [Member]
Schedule Of Securities [Line Items]
Percentage of portfolio	99.00%
Municipal Bonds [Member] | Geographic Concentration Risk [Member] | Pennsylvania, Ohio and Maryland [Member]
Schedule Of Securities [Line Items]
Percentage of portfolio	93.80%
Pooled TPS [Member]
Schedule Of Securities [Line Items]
Net proceeds from sale of securities		51,540,000
Net securities (losses) gains		13,766,000
Other Securities [Member]
Schedule Of Securities [Line Items]
Net securities (losses) gains		$ 2,049,000

Securities - Amortized Cost and

Securities - Amortized Cost and Fair Value of Securities, by Contractual Maturities (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule Of Securities [Line Items]
Available for Sale, Due in one year or less, Amortized Cost	$ 5,178
Available for Sale, Due from one to five years, Amortized Cost	403,591
Available for Sale, Due from five to ten years, Amortized Cost	10,013
Available for Sale, Due after ten years, Amortized Cost	4,896
Available for Sale, with contractual maturities, Amortized Cost	423,678
Total securities available for sale, Amortized Cost	1,636,526	$ 1,534,771	$ 1,169,482
Available for Sale, Due in one year or less, Fair Value	5,183
Available for Sale, Due from one to five years, Fair Value	403,401
Available for Sale, Due from five to ten years, Fair Value	10,304
Available for Sale, Due after ten years, Fair Value	4,245
Available for Sale, with contractual maturities, Fair Value	423,133
Total available for sale Securities, Fair Value	1,630,567	1,534,065	1,141,650
Held to Maturity, Due in one year or less, Amortized Cost	2,409
Held to Maturity, Due from one to five years, Amortized Cost	136,744
Held to Maturity, Due from five to ten years, Amortized Cost	64,954
Held to Maturity, Due after ten years, Amortized Cost	169,351
Securities Held To Maturity, with contractual maturities, Amortized Cost	373,458
Held to Maturity, with contractual maturities, Amortized Cost	1,637,061	1,453,355	1,199,169
Held to Maturity, Due in one year or less, Fair Value	2,426
Held to Maturity, Due from one to five years, Fair Value	136,841
Held to Maturity, Due from five to ten years, Fair Value	66,347
Held to Maturity, Due after ten years, Fair Value	172,501
Securities Held To Maturity, with contractual maturities, Fair Value	378,115
Held to Maturity, with contractual maturities, Fair Value	1,643,416	1,468,258	1,189,563
Agency Mortgage-Backed Securities [Member]
Schedule Of Securities [Line Items]
Total securities available for sale, Amortized Cost	703,069	546,572	247,880
Total available for sale Securities, Fair Value	704,831
Held to Maturity, with contractual maturities, Amortized Cost	709,970	677,169	628,681
Held to Maturity, with contractual maturities, Fair Value	718,652	693,535	634,930
Agency Collateralized Mortgage Obligations [Member]
Schedule Of Securities [Line Items]
Total securities available for sale, Amortized Cost	503,328	580,601	511,098
Total available for sale Securities, Fair Value	495,830
Held to Maturity, with contractual maturities, Amortized Cost	499,694	501,965	385,408
Held to Maturity, with contractual maturities, Fair Value	492,840	496,494	370,328
Non-Agency Collateralized Mortgage Obligations [Member]
Schedule Of Securities [Line Items]
Total securities available for sale, Amortized Cost	1,177	1,414	1,747
Total available for sale Securities, Fair Value	1,190
Held to Maturity, with contractual maturities, Amortized Cost	2,681	4,285	6,852
Held to Maturity, with contractual maturities, Fair Value	2,695	4,313	6,892
Commercial Mortgage-Backed Securities [Member]
Schedule Of Securities [Line Items]
Total securities available for sale, Amortized Cost	4,299	7,891
Total available for sale Securities, Fair Value	4,287
Held to Maturity, with contractual maturities, Amortized Cost	51,258	17,560	2,241
Held to Maturity, with contractual maturities, Fair Value	51,114	17,739	2,328
Equity Securities [Member]
Schedule Of Securities [Line Items]
Total securities available for sale, Amortized Cost	975	$ 1,031	$ 1,444
Total available for sale Securities, Fair Value	$ 1,296

Securities - Summaries of Fair

Securities - Summaries of Fair Values and Unrealized Losses of Securities, Segregated by Length of Impairment (Detail) $ in Thousands	Dec. 31, 2015USD ($)Security	Dec. 31, 2014USD ($)Security	Dec. 31, 2013USD ($)
Schedule Of Securities [Line Items]
Number of available for sale securities, Less than 1 year | Security	36	19
Number of available for sale securities, Greater than 1 year | Security	23	28
Number of available for sale securities | Security	59	47
Securities Available For Sale, Less than 12 Months, Fair Value	$ 589,609	$ 309,919
Securities Available For Sale, Less than 12 Months, Unrealized Losses	(5,027)	(1,559)
Securities Available For Sale, 12 Months or More, Fair Value	254,062	332,215
Securities Available For Sale, 12 Months or More, Unrealized Losses	(8,326)	(10,362)
Securities Available For Sale, Fair Value, Total	843,671	642,134
Securities Available For Sale, Unrealized Losses, Total	$ (13,353)	$ (11,921)
Number of held to maturity securities | Security	59	36
Securities Held To Maturity, Less than 12 Months, Fair Value	$ 466,354	$ 131,586
Securities Held To Maturity, Less than 12 Months, Unrealized Losses	(3,126)	(675)
Securities Held To Maturity, Greater than 12 Months, Fair Value	176,411	269,653
Securities Held To Maturity, Greater than 12 Months, Unrealized Losses	(6,462)	(7,567)
Securities Held To Maturity, Fair Value, Total	642,765	401,239
Securities Held To Maturity, Unrealized Losses, Total	$ (9,588)	$ (8,242)	$ (25,090)
Less than 12 Months [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities | Security	43	12
Greater than 12 Months [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities | Security	16	24
U.S. Government-Sponsored Entities [Member]
Schedule Of Securities [Line Items]
Number of available for sale securities, Less than 1 year | Security	6	7
Number of available for sale securities, Greater than 1 year | Security	2	7
Number of available for sale securities | Security	8	14
Securities Available For Sale, Less than 12 Months, Fair Value	$ 99,131	$ 89,986
Securities Available For Sale, Less than 12 Months, Unrealized Losses	(814)	(275)
Securities Available For Sale, 12 Months or More, Fair Value	34,487	99,326
Securities Available For Sale, 12 Months or More, Unrealized Losses	(511)	(1,664)
Securities Available For Sale, Fair Value, Total	133,618	189,312
Securities Available For Sale, Unrealized Losses, Total	$ (1,325)	$ (1,939)
Number of held to maturity securities | Security	4	4
Securities Held To Maturity, Less than 12 Months, Fair Value	$ 39,843	$ 24,989
Securities Held To Maturity, Less than 12 Months, Unrealized Losses	(173)	(40)
Securities Held To Maturity, Greater than 12 Months, Fair Value	14,778	29,516
Securities Held To Maturity, Greater than 12 Months, Unrealized Losses	(222)	(484)
Securities Held To Maturity, Fair Value, Total	54,621	54,505
Securities Held To Maturity, Unrealized Losses, Total	$ (395)	$ (524)	(1,151)
U.S. Government-Sponsored Entities [Member] | Less than 12 Months [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities | Security	3	2
U.S. Government-Sponsored Entities [Member] | Greater than 12 Months [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities | Security	1	2
Agency Mortgage-Backed Securities [Member]
Schedule Of Securities [Line Items]
Number of available for sale securities, Less than 1 year | Security	19	2
Number of available for sale securities | Security	19	2
Securities Available For Sale, Less than 12 Months, Fair Value	$ 359,250	$ 45,145
Securities Available For Sale, Less than 12 Months, Unrealized Losses	(2,832)	(35)
Securities Available For Sale, Fair Value, Total	359,250	45,145
Securities Available For Sale, Unrealized Losses, Total	$ (2,832)	$ (35)
Number of held to maturity securities | Security	18	5
Securities Held To Maturity, Less than 12 Months, Fair Value	$ 212,024	$ 1,099
Securities Held To Maturity, Less than 12 Months, Unrealized Losses	(1,159)	(1)
Securities Held To Maturity, Greater than 12 Months, Fair Value	917	45,042
Securities Held To Maturity, Greater than 12 Months, Unrealized Losses	(17)	(345)
Securities Held To Maturity, Fair Value, Total	212,941	46,141
Securities Held To Maturity, Unrealized Losses, Total	$ (1,176)	$ (346)	(6,032)
Agency Mortgage-Backed Securities [Member] | Less than 12 Months [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities | Security	17	1
Agency Mortgage-Backed Securities [Member] | Greater than 12 Months [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities | Security	1	4
Agency Collateralized Mortgage Obligations [Member]
Schedule Of Securities [Line Items]
Number of available for sale securities, Less than 1 year | Security	9	9
Number of available for sale securities, Greater than 1 year | Security	18	16
Number of available for sale securities | Security	27	25
Securities Available For Sale, Less than 12 Months, Fair Value	$ 126,309	$ 166,908
Securities Available For Sale, Less than 12 Months, Unrealized Losses	(1,366)	(1,238)
Securities Available For Sale, 12 Months or More, Fair Value	215,330	225,700
Securities Available For Sale, 12 Months or More, Unrealized Losses	(7,164)	(7,809)
Securities Available For Sale, Fair Value, Total	341,639	392,608
Securities Available For Sale, Unrealized Losses, Total	$ (8,530)	$ (9,047)
Number of held to maturity securities | Security	25	22
Securities Held To Maturity, Less than 12 Months, Fair Value	$ 150,593	$ 104,071
Securities Held To Maturity, Less than 12 Months, Unrealized Losses	(1,434)	(630)
Securities Held To Maturity, Greater than 12 Months, Fair Value	160,716	189,642
Securities Held To Maturity, Greater than 12 Months, Unrealized Losses	(6,223)	(6,699)
Securities Held To Maturity, Fair Value, Total	311,309	293,713
Securities Held To Maturity, Unrealized Losses, Total	$ (7,657)	$ (7,329)	(15,844)
Agency Collateralized Mortgage Obligations [Member] | Less than 12 Months [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities | Security	11	8
Agency Collateralized Mortgage Obligations [Member] | Greater than 12 Months [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities | Security	14	14
Commercial Mortgage-Backed Securities [Member]
Schedule Of Securities [Line Items]
Number of available for sale securities, Less than 1 year | Security	1	1
Number of available for sale securities | Security	1	1
Securities Available For Sale, Less than 12 Months, Fair Value	$ 4,287	$ 7,880
Securities Available For Sale, Less than 12 Months, Unrealized Losses	(12)	(11)
Securities Available For Sale, Fair Value, Total	4,287	7,880
Securities Available For Sale, Unrealized Losses, Total	$ (12)	$ (11)
Number of held to maturity securities | Security	3
Securities Held To Maturity, Less than 12 Months, Fair Value	$ 46,278
Securities Held To Maturity, Less than 12 Months, Unrealized Losses	(259)
Securities Held To Maturity, Fair Value, Total	46,278
Securities Held To Maturity, Unrealized Losses, Total	$ (259)		(37)
Commercial Mortgage-Backed Securities [Member] | Less than 12 Months [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities | Security	3
States of the U.S. and Political Subdivisions [Member]
Schedule Of Securities [Line Items]
Number of available for sale securities, Greater than 1 year | Security		1
Number of available for sale securities | Security		1
Securities Available For Sale, 12 Months or More, Fair Value		$ 1,159
Securities Available For Sale, 12 Months or More, Unrealized Losses		(32)
Securities Available For Sale, Fair Value, Total		1,159
Securities Available For Sale, Unrealized Losses, Total		$ (32)
Number of held to maturity securities | Security	9	5
Securities Held To Maturity, Less than 12 Months, Fair Value	$ 17,616	$ 1,427
Securities Held To Maturity, Less than 12 Months, Unrealized Losses	(101)	(4)
Securities Held To Maturity, Greater than 12 Months, Fair Value		5,453
Securities Held To Maturity, Greater than 12 Months, Unrealized Losses		(39)
Securities Held To Maturity, Fair Value, Total	17,616	6,880
Securities Held To Maturity, Unrealized Losses, Total	$ (101)	$ (43)	$ (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 | Security	9	1
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 | Security		4
Other Securities [Member]
Schedule Of Securities [Line Items]
Number of available for sale securities, Greater than 1 year | Security	3	4
Number of available for sale securities | Security	3	4
Securities Available For Sale, 12 Months or More, Fair Value	$ 4,245	$ 6,030
Securities Available For Sale, 12 Months or More, Unrealized Losses	(651)	(857)
Securities Available For Sale, Fair Value, Total	4,245	6,030
Securities Available For Sale, Unrealized Losses, Total	$ (651)	$ (857)
Equity Securities [Member]
Schedule Of Securities [Line Items]
Number of available for sale securities, Less than 1 year | Security	1
Number of available for sale securities | Security	1
Securities Available For Sale, Less than 12 Months, Fair Value	$ 632
Securities Available For Sale, Less than 12 Months, Unrealized Losses	(3)
Securities Available For Sale, Fair Value, Total	632
Securities Available For Sale, Unrealized Losses, Total	$ (3)

Securities - Summary of Cumulat

Securities - Summary of Cumulative Credit-Related OTTI Charges (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Beginning balance	$ 27	$ 17,182
Loss where impairment was not previously recognized	0	0
Additional loss where impairment was previously recognized	0	0
Reduction due to credit impaired securities sold		(17,155)
Ending balance	27	27
Collateralized Debt Obligations [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Beginning balance		17,155
Loss where impairment was not previously recognized	0	0
Additional loss where impairment was previously recognized	0	0
Reduction due to credit impaired securities sold		(17,155)
Equity Securities [Member]
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Beginning balance	27	27
Loss where impairment was not previously recognized	0	0
Additional loss where impairment was previously recognized	0	0
Ending balance	$ 27	$ 27

Federal Home Loan Bank Stock -

Federal Home Loan Bank Stock - Additional Information (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Federal Home Loan Bank stock	$ 72,890	$ 54,751

Loans and Leases - Summary of L

Loans and Leases - Summary of Loans and Leases, Net of Unearned Income (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	$ 12,190,440	$ 11,247,038
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	4,109,056	3,815,708
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	2,601,722	2,318,015
Commercial Leases [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	204,553	177,824
Total Commercial Loans and Leases [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	6,915,331	6,311,547
Direct Installment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	1,706,636	1,644,621
Residential Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	1,395,971	1,263,053
Indirect Installment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	996,729	875,551
Consumer Lines of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	1,137,255	1,110,976
Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	38,518	41,290
Originated Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	11,031,979	9,666,145
Originated Loans [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	3,531,146	3,031,810
Originated Loans [Member] | Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	2,534,351	2,197,793
Originated Loans [Member] | Commercial Leases [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	204,553	177,824
Originated Loans [Member] | Total Commercial Loans and Leases [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	6,270,050	5,407,427
Originated Loans [Member] | Direct Installment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	1,660,717	1,579,770
Originated Loans [Member] | Residential Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	1,044,689	817,586
Originated Loans [Member] | Indirect Installment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	996,175	873,645
Originated Loans [Member] | Consumer Lines of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	1,021,830	946,427
Originated Loans [Member] | Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	38,518	41,290
Acquired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	1,158,461	1,580,893
Acquired Loans [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	577,910	783,898
Acquired Loans [Member] | Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	67,371	120,222
Acquired Loans [Member] | Total Commercial Loans and Leases [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	645,281	904,120
Acquired Loans [Member] | Direct Installment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	45,919	64,851
Acquired Loans [Member] | Residential Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	351,282	445,467
Acquired Loans [Member] | Indirect Installment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	554	1,906
Acquired Loans [Member] | Consumer Lines of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	$ 115,425	$ 164,549

Loans and Leases - Additional I

Loans and Leases - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)Loans	Dec. 31, 2014USD ($)Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Consumer loans	$ 186,162	$ 180,588
Commercial construction loans	$ 352,322	$ 296,156
Concentration of loans | Loans	0	0
Concentration of loans, percentage	Excess of 10%
Carrying amount	$ 12,190,440	$ 11,247,038
Sustained period of delinquency for impairment evaluation	90 days	90 days
Minimum reserves for commercial loan	$ 500
Minimum amount to allocate specific valuation allowance	500
Allowance for loan losses	6,727	$ 7,974
Restructured loans returned to performing status	7,338
Valuation for impairment of loans with pooled reserves	500	500
Pooled reserves for all other classes of loans	3,515	3,448
Consumer Lines of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount	1,137,255	1,110,976
Allowance for loan losses	522	267
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount	4,109,056	3,815,708
Allowance for loan losses	3,073	3,286
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount	2,601,722	2,318,015
Allowance for loan losses	695	1,484
Direct Installment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount	1,706,636	1,644,621
Allowance for loan losses	1,557	1,847
Residential Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount	1,395,971	1,263,053
Allowance for loan losses	659	858
Indirect Installment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount	996,729	875,551
Allowance for loan losses	221	232
Purchased Credit-Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount	5,940	9,556
Specific reserves for commercial TDRs [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Reserves in allowance for loan losses, TDRs	300	371
Pooled reserves for commercial TDRs [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Reserves in allowance for loan losses, TDRs	$ 929	$ 1,215
Loan Portfolio Diversification Risk [Member] | Loans and Leases Receivable Net of Deferred Income [Member] | Construction Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of portfolio	2.90%	2.60%
Loan Portfolio Diversification Risk [Member] | Loans and Leases Receivable Net of Deferred Income [Member] | Consumer Lines of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of portfolio	1.50%	1.60%
Loan Portfolio Diversification Risk [Member] | Commercial Real Estate Loans [Member] | Owner-Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of portfolio	38.10%	41.60%
Loan Portfolio Diversification Risk [Member] | Commercial Real Estate Loans [Member] | Non-Owner-Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of portfolio	61.90%	58.40%
Credit Concentration Risk [Member] | Acquired Loans Receivable [Member] | Purchased Credit-Impaired Loans [Member] | Maximum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of portfolio	1.00%
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
Carrying value of OREO through foreclosure	$ 5,219
Mortgage loans on real estate, foreclosure	$ 11,725

Loans and Leases - Summary of72

Loans and Leases - Summary of Loans to Related Parties (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)
Receivables [Abstract]
Total loans, Beginning Balance	$ 42,263
New loans	4,954
Repayments	(3,802)
Other	(1,614)
Total loans, Ending Balance	$ 41,801

Loans and Leases - Summary of O

Loans and Leases - Summary of Outstanding Principal Balance and Carrying Amount of Acquired Loans (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount	$ 12,190,440	$ 11,247,038
Accounted for under ASC 310-30 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	1,258,418	1,597,558
Carrying amount	1,011,139	1,344,171
Accounted for under ASC 310-20 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	146,161	242,488
Carrying amount	140,595	228,748
Acquired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	1,404,579	1,840,046
Carrying amount	$ 1,151,734	$ 1,572,919

Loans and Leases - Summary of C

Loans and Leases - Summary of Change in Accretable Yield of Acquired Loans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period [Abstract]
Balance at beginning of period	$ 331,899	$ 305,646
Acquisitions		125,001
Reduction due to unexpected early payoffs	(47,075)	(48,556)
Reclass from non-accretable difference	32,141	29,643
Disposals/transfers	(674)	(5,513)
Accretion	(60,171)	(74,322)
Balance at end of period	$ 256,120	$ 331,899

Loans and Leases - Summary of N

Loans and Leases - Summary of Non-Performing Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled debt restructurings	$ 45,500	$ 41,152
Non-Performing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	49,897	45,113
Troubled debt restructurings	22,028	23,439
Total non-performing loans	71,925	68,552
Other real estate owned (OREO)	38,918	41,466
Total non-performing assets	$ 110,843	$ 110,018
Non-performing loans as a percent of total loans and leases	0.59%	0.61%
Non-performing loans + OREO as a percent of total loans and leases + OREO	0.91%	0.97%
Non-performing assets as a percent of total assets	0.63%	0.68%

Loans and Leases - Age Analysis

Loans and Leases - Age Analysis of Past Due Loans, by Class (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	$ 12,190,440	$ 11,247,038
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	4,109,056	3,815,708
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	2,601,722	2,318,015
Commercial Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	204,553	177,824
Total Commercial Loans and Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	6,915,331	6,311,547
Direct Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	1,706,636	1,644,621
Residential Mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	1,395,971	1,263,053
Indirect Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	996,729	875,551
Consumer Lines of Credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	1,137,255	1,110,976
Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	38,518	41,290
Originated Loans and Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	46,683	41,275
> 90 Days Past Due and Still Accruing	7,024	9,248
Non-Accrual	48,774	45,113
Total Past Due	102,481	95,636
Current	10,929,498	9,570,509
Total Loans	11,031,979	9,666,145
Originated Loans and Leases [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	11,006	9,601
> 90 Days Past Due and Still Accruing	1	313
Non-Accrual	23,503	24,132
Total Past Due	34,510	34,046
Current	3,496,636	2,997,764
Total Loans	3,531,146	3,031,810
Originated Loans and Leases [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	5,409	2,446
> 90 Days Past Due and Still Accruing	3	3
Non-Accrual	14,382	8,310
Total Past Due	19,794	10,759
Current	2,514,557	2,187,034
Total Loans	2,534,351	2,197,793
Originated Loans and Leases [Member] | Commercial Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	924	961
> 90 Days Past Due and Still Accruing		43
Non-Accrual	659	722
Total Past Due	1,583	1,726
Current	202,970	176,098
Total Loans	204,553	177,824
Originated Loans and Leases [Member] | Total Commercial Loans and Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	17,339	13,008
> 90 Days Past Due and Still Accruing	4	359
Non-Accrual	38,544	33,164
Total Past Due	55,887	46,531
Current	6,214,163	5,360,896
Total Loans	6,270,050	5,407,427
Originated Loans and Leases [Member] | Direct Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	9,254	9,333
> 90 Days Past Due and Still Accruing	3,813	3,617
Non-Accrual	4,806	7,117
Total Past Due	17,873	20,067
Current	1,642,844	1,559,703
Total Loans	1,660,717	1,579,770
Originated Loans and Leases [Member] | Residential Mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	8,135	8,709
> 90 Days Past Due and Still Accruing	1,470	3,891
Non-Accrual	2,882	2,964
Total Past Due	12,487	15,564
Current	1,032,202	802,022
Total Loans	1,044,689	817,586
Originated Loans and Leases [Member] | Indirect Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	9,472	7,804
> 90 Days Past Due and Still Accruing	379	684
Non-Accrual	1,361	1,149
Total Past Due	11,212	9,637
Current	984,963	864,008
Total Loans	996,175	873,645
Originated Loans and Leases [Member] | Consumer Lines of Credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	2,410	2,408
> 90 Days Past Due and Still Accruing	1,189	562
Non-Accrual	1,181	719
Total Past Due	4,780	3,689
Current	1,017,050	942,738
Total Loans	1,021,830	946,427
Originated Loans and Leases [Member] | Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	73	13
> 90 Days Past Due and Still Accruing	169	135
Total Past Due	242	148
Current	38,276	41,142
Total Loans	38,518	41,290
Acquired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	15,034	24,678
> 90 Days Past Due and Still Accruing	29,718	38,024
Non-Accrual	1,123
Total Past Due	45,875	62,702
Current	1,193,517	1,612,959
Discount	(80,931)	(94,768)
Total Loans	1,158,461	1,580,893
Acquired Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	6,399	12,076
> 90 Days Past Due and Still Accruing	12,752	12,368
Non-Accrual	931
Total Past Due	20,082	24,444
Current	593,128	799,991
Discount	(35,300)	(40,537)
Total Loans	577,910	783,898
Acquired Loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	1,065	687
> 90 Days Past Due and Still Accruing	616	1,968
Non-Accrual	103
Total Past Due	1,784	2,655
Current	72,037	127,535
Discount	(6,450)	(9,968)
Total Loans	67,371	120,222
Acquired Loans [Member] | Total Commercial Loans and Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	7,464	12,763
> 90 Days Past Due and Still Accruing	13,368	14,336
Non-Accrual	1,034
Total Past Due	21,866	27,099
Current	665,165	927,526
Discount	(41,750)	(50,505)
Total Loans	645,281	904,120
Acquired Loans [Member] | Direct Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	837	2,670
> 90 Days Past Due and Still Accruing	659	1,443
Total Past Due	1,496	4,113
Current	43,596	59,532
Discount	827	1,206
Total Loans	45,919	64,851
Acquired Loans [Member] | Residential Mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	5,871	8,159
> 90 Days Past Due and Still Accruing	15,136	19,936
Total Past Due	21,007	28,095
Current	366,742	456,810
Discount	(36,467)	(39,438)
Total Loans	351,282	445,467
Acquired Loans [Member] | Indirect Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	32	38
> 90 Days Past Due and Still Accruing	9	30
Total Past Due	41	68
Current	571	2,179
Discount	(58)	(341)
Total Loans	554	1,906
Acquired Loans [Member] | Consumer Lines of Credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	830	1,048
> 90 Days Past Due and Still Accruing	546	2,279
Non-Accrual	89
Total Past Due	1,465	3,327
Current	117,443	166,912
Discount	(3,483)	(5,690)
Total Loans	$ 115,425	$ 164,549

Loans and Leases - Summary of77

Loans and Leases - Summary of Commercial Loans by Credit Quality (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Originated Loans and Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	$ 6,270,050	$ 5,407,427
Originated Loans and Leases [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	3,531,146	3,031,810
Originated Loans and Leases [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	2,534,351	2,197,793
Originated Loans and Leases [Member] | Commercial Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	204,553	177,824
Acquired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	645,281	904,120
Acquired Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	577,910	783,898
Acquired Loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	67,371	120,222
Pass [Member] | Originated Loans and Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	5,949,837	5,151,400
Pass [Member] | Originated Loans and Leases [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	3,416,527	2,890,830
Pass [Member] | Originated Loans and Leases [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	2,335,103	2,085,893
Pass [Member] | Originated Loans and Leases [Member] | Commercial Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	198,207	174,677
Pass [Member] | Acquired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	520,608	714,122
Pass [Member] | Acquired Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	464,162	610,260
Pass [Member] | Acquired Loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	56,446	103,862
Special Mention [Member] | Originated Loans and Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	164,873	132,248
Special Mention [Member] | Originated Loans and Leases [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	52,887	58,630
Special Mention [Member] | Originated Loans and Leases [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	109,539	71,420
Special Mention [Member] | Originated Loans and Leases [Member] | Commercial Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	2,447	2,198
Special Mention [Member] | Acquired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	50,801	77,397
Special Mention [Member] | Acquired Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	47,619	73,891
Special Mention [Member] | Acquired Loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	3,182	3,506
Substandard [Member] | Originated Loans and Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	152,690	122,584
Substandard [Member] | Originated Loans and Leases [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	61,411	81,951
Substandard [Member] | Originated Loans and Leases [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	87,380	39,684
Substandard [Member] | Originated Loans and Leases [Member] | Commercial Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	3,899	949
Substandard [Member] | Acquired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	73,872	112,601
Substandard [Member] | Acquired Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	66,129	99,747
Substandard [Member] | Acquired Loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	7,743	12,854
Doubtful [Member] | Originated Loans and Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	2,650	1,195
Doubtful [Member] | Originated Loans and Leases [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	321	399
Doubtful [Member] | Originated Loans and Leases [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	$ 2,329	$ 796

Loans and Leases - Summary of78

Loans and Leases - Summary of Consumer Loans by Payment Status (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Credit Quality [Line Items]
Total Loans	$ 12,190,440	$ 11,247,038
Non-Performing [Member]
Credit Quality [Line Items]
Non-Performing Loans	71,925	68,552
Direct Installment [Member]
Credit Quality [Line Items]
Total Loans	1,706,636	1,644,621
Direct Installment [Member] | Performing [Member]
Credit Quality [Line Items]
Performing Loans	1,646,925	1,565,090
Direct Installment [Member] | Non-Performing [Member]
Credit Quality [Line Items]
Non-Performing Loans	13,792	14,680
Residential Mortgages [Member]
Credit Quality [Line Items]
Total Loans	1,395,971	1,263,053
Residential Mortgages [Member] | Performing [Member]
Credit Quality [Line Items]
Performing Loans	1,031,926	802,522
Residential Mortgages [Member] | Non-Performing [Member]
Credit Quality [Line Items]
Non-Performing Loans	12,763	15,064
Indirect Installment [Member]
Credit Quality [Line Items]
Total Loans	996,729	875,551
Indirect Installment [Member] | Performing [Member]
Credit Quality [Line Items]
Performing Loans	994,661	872,340
Indirect Installment [Member] | Non-Performing [Member]
Credit Quality [Line Items]
Non-Performing Loans	1,514	1,305
Consumer Lines of Credit [Member] | Performing [Member]
Credit Quality [Line Items]
Performing Loans	1,019,783	944,631
Consumer Lines of Credit [Member] | Non-Performing [Member]
Credit Quality [Line Items]
Non-Performing Loans	2,047	1,796
Other [Member]
Credit Quality [Line Items]
Total Loans	38,518	41,290
Other [Member] | Performing [Member]
Credit Quality [Line Items]
Performing Loans	38,518	41,290
Originated Loans [Member]
Credit Quality [Line Items]
Total Loans	11,031,979	9,666,145
Originated Loans [Member] | Direct Installment [Member]
Credit Quality [Line Items]
Total Loans	1,660,717	1,579,770
Originated Loans [Member] | Residential Mortgages [Member]
Credit Quality [Line Items]
Total Loans	1,044,689	817,586
Originated Loans [Member] | Indirect Installment [Member]
Credit Quality [Line Items]
Total Loans	996,175	873,645
Originated Loans [Member] | Consumer Lines of Credit [Member]
Credit Quality [Line Items]
Total Loans	1,021,830	946,427
Originated Loans [Member] | Other [Member]
Credit Quality [Line Items]
Total Loans	$ 38,518	$ 41,290

Loans and Leases - Summary of I

Loans and Leases - Summary of Impaired Loans and Lease, by Class (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	$ 84,525	$ 81,765
Recorded Investment With No Specific Reserve	64,374	66,619
Recorded Investment With Specific Reserve	6,315	2,831
Total Recorded Investment	70,689	69,450
Specific Reserve	2,650	1,179
Average Recorded Investment	68,950	75,367
Commercial Real Estate [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	33,780	34,583
Recorded Investment With No Specific Reserve	24,423	25,443
Recorded Investment With Specific Reserve	772	883
Total Recorded Investment	25,195	26,326
Specific Reserve	321	399
Average Recorded Investment	26,143	30,807
Commercial and Industrial [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	15,860	11,412
Recorded Investment With No Specific Reserve	9,176	7,609
Recorded Investment With Specific Reserve	5,543	1,948
Total Recorded Investment	14,719	9,557
Specific Reserve	2,329	780
Average Recorded Investment	12,298	9,510
Commercial Leases [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	659	722
Recorded Investment With No Specific Reserve	659	722
Total Recorded Investment	659	722
Average Recorded Investment	747	686
Total Commercial Loans and Leases [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	50,299	46,717
Recorded Investment With No Specific Reserve	34,258	33,774
Recorded Investment With Specific Reserve	6,315	2,831
Total Recorded Investment	40,573	36,605
Specific Reserve	2,650	1,179
Average Recorded Investment	39,188	41,003
Direct Installment [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	14,679	14,987
Recorded Investment With No Specific Reserve	13,792	14,680
Total Recorded Investment	13,792	14,680
Average Recorded Investment	13,267	14,248
Residential Mortgages [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	13,394	16,791
Recorded Investment With No Specific Reserve	12,763	15,064
Total Recorded Investment	12,763	15,064
Average Recorded Investment	12,896	16,924
Indirect Installment [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	3,745	1,467
Recorded Investment With No Specific Reserve	1,514	1,305
Total Recorded Investment	1,514	1,305
Average Recorded Investment	1,401	1,399
Consumer Lines of Credit [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	2,408	1,803
Recorded Investment With No Specific Reserve	2,047	1,796
Total Recorded Investment	2,047	1,796
Average Recorded Investment	$ 2,198	$ 1,793

Loans and Leases - Summary of80

Loans and Leases - Summary of Composition of Total TDRs (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings ("TDRs")	$ 45,500	$ 41,152
Performing [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings ("TDRs")	15,165	9,441
Non-Performing [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings ("TDRs")	22,028	23,439
Non-Accrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings ("TDRs")	$ 8,307	$ 8,272

Loans and Leases - Summary of T

Loans and Leases - Summary of Troubled Debt Restructurings by Class of Loans (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)Contract	Dec. 31, 2014USD ($)Contract
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	613	648
Pre-Modification Outstanding Recorded Investment	$ 10,554	$ 12,876
Post-Modification Outstanding Recorded Investment	$ 9,818	$ 11,704
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	3	11
Pre-Modification Outstanding Recorded Investment	$ 1,165	$ 2,946
Post-Modification Outstanding Recorded Investment	$ 960	$ 2,282
Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	1	4
Pre-Modification Outstanding Recorded Investment	$ 5	$ 573
Post-Modification Outstanding Recorded Investment	$ 4	$ 540
Total Commercial Loans and Leases [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	4	15
Pre-Modification Outstanding Recorded Investment	$ 1,170	$ 3,519
Post-Modification Outstanding Recorded Investment	$ 964	$ 2,822
Direct Installment [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	489	522
Pre-Modification Outstanding Recorded Investment	$ 6,712	$ 5,742
Post-Modification Outstanding Recorded Investment	$ 6,314	$ 5,422
Residential Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	45	46
Pre-Modification Outstanding Recorded Investment	$ 1,667	$ 2,456
Post-Modification Outstanding Recorded Investment	$ 1,660	$ 2,357
Indirect Installment [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	17	24
Pre-Modification Outstanding Recorded Investment	$ 55	$ 70
Post-Modification Outstanding Recorded Investment	$ 48	$ 66
Consumer Lines of Credit [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	58	41
Pre-Modification Outstanding Recorded Investment	$ 950	$ 1,089
Post-Modification Outstanding Recorded Investment	$ 832	$ 1,037

Loans and Leases - Summary of82

Loans and Leases - Summary of Troubled Debt Restructurings by Class of Loans, Payment Default (Detail) $ in Thousands		12 Months Ended
		Dec. 31, 2015USD ($)Contract	Dec. 31, 2014USD ($)Contract
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract		114	109
Recorded Investment | $	[1]	$ 856	$ 945
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract		1
Recorded Investment | $	[1]	$ 26
Total Commercial Loans and Leases [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract		1
Recorded Investment | $	[1]	$ 26
Direct Installment [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract		97	97
Recorded Investment | $	[1]	$ 510	$ 728
Residential Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract		7	4
Recorded Investment | $	[1]	$ 306	$ 151
Indirect Installment [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract		9	7
Recorded Investment | $	[1]	$ 14	$ 16
Consumer Lines of Credit [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract			1
Recorded Investment | $	[1]		$ 50
[1]	The recorded investment is as of period end.

Allowance for Credit Losses - S

Allowance for Credit Losses - Summary of Changes in Allowance for Credit Losses by Loan and Lease Class (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule Of Allowance For Loan Losses [Line Items]
Balance at Beginning of Year	$ 125,926	$ 110,784	$ 104,374
Charge- Offs	(31,068)	(30,735)	(30,530)
Recoveries	6,713	7,229	5,850
Net Charge- Offs	(24,355)	(23,506)	(24,680)
Provision for credit losses	40,441	38,648	31,090
Balance at End of Year	142,012	125,926	110,784
Originated Loans [Member]
Schedule Of Allowance For Loan Losses [Line Items]
Balance at Beginning of Year	117,952	104,884	100,194
Charge- Offs	(30,174)	(27,248)	(27,701)
Recoveries	6,023	6,222	6,226
Net Charge- Offs	(24,151)	(21,026)	(21,475)
Provision for credit losses	41,484	34,094	26,165
Balance at End of Year	135,285	117,952	104,884
Acquired Loans [Member]
Schedule Of Allowance For Loan Losses [Line Items]
Balance at Beginning of Year	7,974	5,900	4,180
Charge- Offs	(894)	(3,487)	(2,829)
Recoveries	690	1,007	(376)
Net Charge- Offs	(204)	(2,480)	(3,205)
Provision for credit losses	(1,043)	4,554	4,925
Balance at End of Year	6,727	7,974	5,900
Commercial Real Estate [Member]
Schedule Of Allowance For Loan Losses [Line Items]
Balance at Beginning of Year	37,588	32,548	34,810
Charge- Offs	(4,443)	(6,568)	(5,465)
Recoveries	1,117	2,351	1,799
Net Charge- Offs	(3,326)	(4,217)	(3,666)
Provision for credit losses	7,479	9,257	1,404
Balance at End of Year	41,741	37,588	32,548
Commercial and Industrial [Member]
Schedule Of Allowance For Loan Losses [Line Items]
Balance at Beginning of Year	32,645	32,603	31,849
Charge- Offs	(3,562)	(3,454)	(5,124)
Recoveries	1,773	1,412	2,108
Net Charge- Offs	(1,789)	(2,042)	(3,016)
Provision for credit losses	10,167	2,084	3,770
Balance at End of Year	41,023	32,645	32,603
Commercial Leases [Member]
Schedule Of Allowance For Loan Losses [Line Items]
Balance at Beginning of Year	2,398	1,903	1,744
Charge- Offs	(544)	(415)	(432)
Recoveries	101	105	179
Net Charge- Offs	(443)	(310)	(253)
Provision for credit losses	586	805	412
Balance at End of Year	2,541	2,398	1,903
Total Commercial Loans and Leases [Member]
Schedule Of Allowance For Loan Losses [Line Items]
Balance at Beginning of Year	72,631	67,054	68,403
Charge- Offs	(8,549)	(10,437)	(11,021)
Recoveries	2,991	3,868	4,086
Net Charge- Offs	(5,558)	(6,569)	(6,935)
Provision for credit losses	18,232	12,146	5,586
Balance at End of Year	85,305	72,631	67,054
Direct Installment [Member]
Schedule Of Allowance For Loan Losses [Line Items]
Balance at Beginning of Year	20,538	17,824	15,130
Charge- Offs	(10,844)	(9,600)	(9,059)
Recoveries	1,527	1,163	931
Net Charge- Offs	(9,317)	(8,437)	(8,128)
Provision for credit losses	10,366	11,151	10,822
Balance at End of Year	21,587	20,538	17,824
Residential Mortgages [Member]
Schedule Of Allowance For Loan Losses [Line Items]
Balance at Beginning of Year	8,024	5,836	5,155
Charge- Offs	(1,010)	(760)	(1,345)
Recoveries	85	74	162
Net Charge- Offs	(925)	(686)	(1,183)
Provision for credit losses	810	2,874	1,864
Balance at End of Year	7,909	8,024	5,836
Indirect Installment [Member]
Schedule Of Allowance For Loan Losses [Line Items]
Balance at Beginning of Year	7,504	6,409	5,449
Charge- Offs	(6,427)	(3,627)	(3,337)
Recoveries	1,190	875	773
Net Charge- Offs	(5,237)	(2,752)	(2,564)
Provision for credit losses	7,622	3,847	3,524
Balance at End of Year	9,889	7,504	6,409
Consumer Lines of Credit [Member]
Schedule Of Allowance For Loan Losses [Line Items]
Balance at Beginning of Year	8,496	7,231	6,057
Charge- Offs	(1,653)	(1,495)	(1,974)
Recoveries	175	218	274
Net Charge- Offs	(1,478)	(1,277)	(1,700)
Provision for credit losses	2,564	2,542	2,874
Balance at End of Year	9,582	8,496	7,231
Other [Member]
Schedule Of Allowance For Loan Losses [Line Items]
Balance at Beginning of Year	759	530
Charge- Offs	(1,691)	(1,329)	(965)
Recoveries	55	24
Net Charge- Offs	(1,636)	(1,305)	(965)
Provision for credit losses	1,890	1,534	1,495
Balance at End of Year	1,013	759	530
Purchased Credit-Impaired Loans [Member]
Schedule Of Allowance For Loan Losses [Line Items]
Balance at Beginning of Year	660	1,000	759
Charge- Offs	(64)	(2,614)	(299)
Recoveries	19	1
Net Charge- Offs	(45)	(2,613)	(299)
Provision for credit losses	219	2,273	540
Balance at End of Year	834	660	1,000
Other Acquired Loans [Member]
Schedule Of Allowance For Loan Losses [Line Items]
Balance at Beginning of Year	7,314	4,900	3,421
Charge- Offs	(830)	(873)	(2,530)
Recoveries	671	1,006	(376)
Net Charge- Offs	(159)	133	(2,906)
Provision for credit losses	(1,262)	2,281	4,385
Balance at End of Year	$ 5,893	$ 7,314	$ 4,900

Allowance for Credit Losses -84

Allowance for Credit Losses - Summary of Individual and Collective Allowance for Credit Losses and Loan and Lease Balances by Class (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Valuation Allowance [Line Items]
Allowance, Individually Evaluated for Impairment	$ 2,650	$ 1,179
Allowance, Collectively Evaluated for Impairment	132,635	116,773
Originated Loans and Leases	12,190,440	11,247,038
Loans and Leases Outstanding, Individually Evaluated for Impairment	23,706	19,789
Loans and Leases Outstanding, Collectively Evaluated for Impairment	11,008,273	9,646,356
Commercial Real Estate [Member]
Valuation Allowance [Line Items]
Allowance, Individually Evaluated for Impairment	321	399
Allowance, Collectively Evaluated for Impairment	41,420	37,189
Originated Loans and Leases	4,109,056	3,815,708
Loans and Leases Outstanding, Individually Evaluated for Impairment	12,904	13,952
Loans and Leases Outstanding, Collectively Evaluated for Impairment	3,518,242	3,017,858
Commercial and Industrial [Member]
Valuation Allowance [Line Items]
Allowance, Individually Evaluated for Impairment	2,329	780
Allowance, Collectively Evaluated for Impairment	38,694	31,865
Originated Loans and Leases	2,601,722	2,318,015
Loans and Leases Outstanding, Individually Evaluated for Impairment	10,802	5,837
Loans and Leases Outstanding, Collectively Evaluated for Impairment	2,523,549	2,191,956
Commercial Leases [Member]
Valuation Allowance [Line Items]
Allowance, Collectively Evaluated for Impairment	2,541	2,398
Originated Loans and Leases	204,553	177,824
Loans and Leases Outstanding, Collectively Evaluated for Impairment	204,553	177,824
Total Commercial Loans and Leases [Member]
Valuation Allowance [Line Items]
Allowance, Individually Evaluated for Impairment	2,650	1,179
Allowance, Collectively Evaluated for Impairment	82,655	71,452
Originated Loans and Leases	6,915,331	6,311,547
Loans and Leases Outstanding, Individually Evaluated for Impairment	23,706	19,789
Loans and Leases Outstanding, Collectively Evaluated for Impairment	6,246,344	5,387,638
Direct Installment [Member]
Valuation Allowance [Line Items]
Allowance, Collectively Evaluated for Impairment	21,587	20,538
Originated Loans and Leases	1,706,636	1,644,621
Loans and Leases Outstanding, Collectively Evaluated for Impairment	1,660,717	1,579,770
Residential Mortgages [Member]
Valuation Allowance [Line Items]
Allowance, Collectively Evaluated for Impairment	7,909	8,024
Originated Loans and Leases	1,395,971	1,263,053
Loans and Leases Outstanding, Collectively Evaluated for Impairment	1,044,689	817,586
Indirect Installment [Member]
Valuation Allowance [Line Items]
Allowance, Collectively Evaluated for Impairment	9,889	7,504
Originated Loans and Leases	996,729	875,551
Loans and Leases Outstanding, Collectively Evaluated for Impairment	996,175	873,645
Consumer Lines of Credit [Member]
Valuation Allowance [Line Items]
Allowance, Collectively Evaluated for Impairment	9,582	8,496
Originated Loans and Leases	1,137,255	1,110,976
Loans and Leases Outstanding, Collectively Evaluated for Impairment	1,021,830	946,427
Other [Member]
Valuation Allowance [Line Items]
Allowance, Collectively Evaluated for Impairment	1,013	759
Originated Loans and Leases	38,518	41,290
Loans and Leases Outstanding, Collectively Evaluated for Impairment	38,518	41,290
Originated Loans and Leases [Member]
Valuation Allowance [Line Items]
Originated Loans and Leases	11,031,979	9,666,145
Originated Loans and Leases [Member] | Commercial Real Estate [Member]
Valuation Allowance [Line Items]
Originated Loans and Leases	3,531,146	3,031,810
Originated Loans and Leases [Member] | Commercial and Industrial [Member]
Valuation Allowance [Line Items]
Originated Loans and Leases	2,534,351	2,197,793
Originated Loans and Leases [Member] | Commercial Leases [Member]
Valuation Allowance [Line Items]
Originated Loans and Leases	204,553	177,824
Originated Loans and Leases [Member] | Total Commercial Loans and Leases [Member]
Valuation Allowance [Line Items]
Originated Loans and Leases	6,270,050	5,407,427
Originated Loans and Leases [Member] | Direct Installment [Member]
Valuation Allowance [Line Items]
Originated Loans and Leases	1,660,717	1,579,770
Originated Loans and Leases [Member] | Residential Mortgages [Member]
Valuation Allowance [Line Items]
Originated Loans and Leases	1,044,689	817,586
Originated Loans and Leases [Member] | Indirect Installment [Member]
Valuation Allowance [Line Items]
Originated Loans and Leases	996,175	873,645
Originated Loans and Leases [Member] | Consumer Lines of Credit [Member]
Valuation Allowance [Line Items]
Originated Loans and Leases	1,021,830	946,427
Originated Loans and Leases [Member] | Other [Member]
Valuation Allowance [Line Items]
Originated Loans and Leases	$ 38,518	$ 41,290

Premises and Equipment - Summar

Premises and Equipment - Summary of Premises and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Property Plant and Equipment Useful Life and Values [Abstract]
Land	$ 33,023	$ 35,473
Premises	143,757	150,868
Equipment	130,066	117,223
Property Plant and Equipment Gross	306,846	303,564
Accumulated depreciation	(147,766)	(134,808)
Property Plant and Equipment Net	$ 159,080	$ 168,756

Premises and Equipment - Additi

Premises and Equipment - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property Plant and Equipment Useful Life and Values [Abstract]
Depreciation expense	$ 20,009	$ 18,671	$ 15,558
Operating leases, expiration date	2,046
Rental expense	$ 16,193	$ 14,564	$ 10,443
Minimum rental commitments	$ 90,320

Premises and Equipment - Summ87

Premises and Equipment - Summary of Future Minimum Lease Payments (Detail) $ in Thousands	Dec. 31, 2015USD ($)
Property Plant and Equipment Useful Life and Values [Abstract]
2,016	$ 14,529
2,017	13,373
2,018	11,768
2,019	9,637
2,020	7,733
Later years	$ 33,280

Goodwill and Other Intangible88

Goodwill and Other Intangible Assets - Rollforward of Goodwill (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Goodwill [Line Items]
Goodwill, Beginning Balance	$ 832,213	$ 764,248
Goodwill (deductions) additions	873	67,965
Goodwill, Ending Balance	833,086	832,213
Community Banking [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	813,434	745,469
Goodwill (deductions) additions	(1,035)	67,965
Goodwill, Ending Balance	812,399	813,434
Wealth Management [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	8,020	8,020
Goodwill, Ending Balance	8,020	8,020
Insurance [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	8,950	8,950
Goodwill (deductions) additions	1,908
Goodwill, Ending Balance	10,858	8,950
Consumer Finance [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	1,809	1,809
Goodwill, Ending Balance	$ 1,809	$ 1,809

Goodwill and Other Intangible89

Goodwill and Other Intangible Assets - Summary of Core Deposit Intangibles, Customer Renewal Lists and Mortgage Servicing Rights (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 136,711	$ 131,254
Accumulated amortization	(91,067)	(83,750)
Core deposit intangibles, Total	45,644	47,504
Core Deposit Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	111,594	108,593
Accumulated amortization	(79,362)	(71,818)
Core deposit intangibles, Total	32,232	36,775
Customer Renewal Lists [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	12,351	10,970
Accumulated amortization	(7,860)	(7,099)
Core deposit intangibles, Total	4,491	3,871
Mortgage Servicing Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	12,766	11,691
Accumulated amortization	(3,845)	(4,833)
Core deposit intangibles, Total	$ 8,921	$ 6,858

Goodwill and Other Intangible90

Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Amortization of intangibles	$ 8,305	$ 9,717	$ 8,407
Amortization of mortgage servicing rights	$ 2,250	$ 2,593	$ 999
Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization period of intangible assets, years	8 years
Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization period of intangible assets, years	13 years
Core Deposit Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization period of intangible assets, years	10 years
Customer Renewal Lists [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization period of intangible assets, years	8 years
Customer Renewal Lists [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization period of intangible assets, years	13 years
Mortgage Servicing Rights [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization period of intangible assets, years	8 years
Mortgage Servicing Rights [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization period of intangible assets, years	13 years

Goodwill and Other Intangible91

Goodwill and Other Intangible Assets - Schedule of Expected Amortization Expense on Finite-Lived Intangible Assets (Detail) $ in Thousands	Dec. 31, 2015USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2,016	$ 9,229
2,017	8,011
2,018	6,150
2,019	5,312
2,020	$ 4,962

Deposits - Summary of Deposits

Deposits - Summary of Deposits (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deposits [Abstract]
Non-interest-bearing demand	$ 3,059,949	$ 2,647,623
Interest-bearing demand	5,311,589	4,547,628
Savings	1,786,459	1,575,922
Certificates and other time deposits	2,465,466	2,611,035
Total Deposits	$ 12,623,463	$ 11,382,208

Deposits - Additional Informati

Deposits - Additional Information (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deposits [Abstract]
Total, time deposits of $250,000 or more	$ 213,805	$ 228,810
Total, time deposits of $100,000 or more	$ 861,042	$ 895,505

Deposits - Time Deposits by Rem

Deposits - Time Deposits by Remaining Maturity (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Time Deposits [Line Items]
Three months or less	$ 96,493
Three to six months	123,403
Six to twelve months	211,905
Over twelve months	429,241
Total, time deposits of $100,000 or more	861,042	$ 895,505
Certificates of Deposit [Member]
Time Deposits [Line Items]
Three months or less	88,520
Three to six months	113,475
Six to twelve months	187,347
Over twelve months	311,127
Total, time deposits of $100,000 or more	700,469
Other Time Deposits [Member]
Time Deposits [Line Items]
Three months or less	7,973
Three to six months	9,928
Six to twelve months	24,558
Over twelve months	118,114
Total, time deposits of $100,000 or more	$ 160,573

Deposits - Summary of Scheduled

Deposits - Summary of Scheduled Maturities of Certificates and Other Time Deposits (Detail) $ in Thousands	Dec. 31, 2015USD ($)
Time Deposits Maturities, after Next Twelve Months [Abstract]
2,016	$ 1,312,627
2,017	439,392
2,018	197,080
2,019	213,622
2,020	197,573
Later years	$ 105,172

Short-Term Borrowings - Summary

Short-Term Borrowings - Summary of Short-Term Borrowings (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Debt Disclosure [Abstract]
Securities sold under repurchase agreements	$ 266,732	$ 882,696
Federal Home Loan Bank advances	1,090,000	820,000
Federal funds purchased	568,000	210,000
Subordinated notes	124,164	128,962
Short-term borrowings	$ 2,048,896	$ 2,041,658

Short-Term Borrowings - Additio

Short-Term Borrowings - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Debt Disclosure [Abstract]
Weighted average interest rates on short-term borrowings during year	0.42%	0.39%	0.43%
Weighted average interest rates on short-term borrowings at period end	0.48%	0.37%	0.41%

Long-Term Borrowings- Summary o

Long-Term Borrowings- Summary of Long-Term Borrowings (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Debt Disclosure [Abstract]
Federal Home Loan Bank advances	$ 400,017	$ 400,042
Subordinated notes	84,668	83,155
Junior subordinated debt	58,298	58,246
Other subordinated debt	98,497
Long-term debt	$ 641,480	$ 541,443

Long-Term Borrowings - Addition

Long-Term Borrowings - Additional Information (Detail) $ in Thousands	1 Months Ended	12 Months Ended
	Oct. 31, 2015USD ($)	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)Trust	Dec. 31, 2014USD ($)	Feb. 15, 2014USD ($)	Dec. 31, 2013
Debt Instrument [Line Items]
Credit available with FHLB			$ 4,541,637
Credit with FHLB used			$ 1,490,017
Federal Home Loan Bank advances are scheduled to mature periodically through the year			2,021
Effective interest rates, minimum			0.76%	0.76%
Effective interest rates, maximum			4.19%	4.19%
Weighted average interest rate on subordinated debt			2.73%	2.70%		2.77%
Notice required of holders prior to redemption			30 days
Number of unconsolidated subsidiary trusts | Trust			2
Percent of the common equity of each Trust owned by the Corporation			100.00%
Junior subordinated debt			$ 58,298	$ 58,246
Redemption of Corporation Issued TPS				33,000
Omega Financial Capital Trust I [Member]
Debt Instrument [Line Items]
Junior subordinated debt			$ 36,133
Scenario, Forecast [Member] | Omega Financial Capital Trust I [Member]
Debt Instrument [Line Items]
Redemption of Corporation Issued TPS		$ 10,000
BCSB Bancorp, Inc. (BCSB) [Member]
Debt Instrument [Line Items]
Junior subordinated debt assumed in acquisition				$ 16,500	$ 17,011
4.875% Subordinated Notes Due in 2025 [Member]
Debt Instrument [Line Items]
Aggregate principal amount	$ 100,000
Debt instrument interest rate percentage	4.875%
Proceeds from issuance of notes	$ 98,443
Trust Preferred Securities Subject to Mandatory Redemption [Member]
Debt Instrument [Line Items]
Percentage of TPS that qualifies as tier 1 capital for 2015			25.00%
Junior subordinated debt			$ 57,500
Percentage of TPS that qualifies as tier 2 capital for 2016			75.00%
Trust Preferred Securities Subject to Mandatory Redemption [Member] | Omega Financial Capital Trust I [Member]
Debt Instrument [Line Items]
Junior subordinated debt			$ 36,000
Minimum [Member]
Debt Instrument [Line Items]
Months prior to maturity, interest discount			3 months
Maximum [Member]
Debt Instrument [Line Items]
Months prior to maturity, interest discount			12 months

Long-Term Borrowings - Junior S

Long-Term Borrowings - Junior Subordinated Debt Trusts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Subordinated Borrowing [Line Items]
Junior subordinated debt	$ 58,298	$ 58,246
Trust Preferred Securities Subject to Mandatory Redemption [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	57,500
Common Stock Subject to Mandatory Redemption [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	1,779
F.N.B. Statutory Trust II [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	$ 22,165
Stated Maturity Date	Jun. 15, 2036
Interest Rate	2.16%
Description of variable rate	Variable; LIBOR + 165 basis points (bps)
Basis points	1.65%
F.N.B. Statutory Trust II [Member] | Trust Preferred Securities Subject to Mandatory Redemption [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	$ 21,500
F.N.B. Statutory Trust II [Member] | Common Stock Subject to Mandatory Redemption [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	665
Omega Financial Capital Trust I [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	$ 36,133
Stated Maturity Date	Oct. 18, 2034
Interest Rate	2.51%
Description of variable rate	Variable; LIBOR + 219 bps
Basis points	2.19%
Omega Financial Capital Trust I [Member] | Trust Preferred Securities Subject to Mandatory Redemption [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	$ 36,000
Omega Financial Capital Trust I [Member] | Common Stock Subject to Mandatory Redemption [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	$ 1,114

Long-Term Borrowings - Schedule

Long-Term Borrowings - Scheduled Annual Maturities of Long-Term Debt (Detail) $ in Thousands	Dec. 31, 2015USD ($)
Debt Disclosure [Abstract]
2,016	$ 155,736
2,017	168,060
2,018	42,758
2,019	28,293
2,020	43,929
Later years	$ 202,704

Derivative Instruments - Schedu

Derivative Instruments - Schedule of Notional Amounts and Gross Fair Values of Derivative Assets and Derivative Liabilities (Detail) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Notional amount	$ 2,893,041,000	$ 2,215,056,000
Fair value, asset	53,202,000	45,898,000
Liability	51,605,000	46,160,000
Interest Rate Contracts [Member]
Derivatives, Fair Value [Line Items]
Notional amount	250,000,000	200,000,000
Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Notional amount	1,262,964,000	972,002,000
Credit Risk Contract [Member]
Derivatives, Fair Value [Line Items]
Fair value, asset	7,000
Subject to Master Netting Arrangement [Member]
Derivatives, Fair Value [Line Items]
Notional amount	1,514,144,000	1,173,212,000
Fair value, asset	3,197,000	2,296,000
Liability	51,453,000	45,985,000
Subject to Master Netting Arrangement [Member] | Interest Rate Contracts [Member]
Derivatives, Fair Value [Line Items]
Notional amount	250,000,000	200,000,000
Fair value, asset	3,178,000	2,109,000
Liability	962,000	2,330,000
Subject to Master Netting Arrangement [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Notional amount	1,262,964,000	972,002,000
Fair value, asset	1,000	140,000
Liability	50,491,000	43,655,000
Subject to Master Netting Arrangement [Member] | Equity Contracts [Member]
Derivatives, Fair Value [Line Items]
Notional amount	1,180,000	1,210,000
Fair value, asset	18,000	47,000
Not Subject to Master Netting Arrangement [Member]
Derivatives, Fair Value [Line Items]
Notional amount	1,378,897,000	1,041,844,000
Fair value, asset	50,005,000	43,602,000
Liability	152,000	175,000
Not Subject to Master Netting Arrangement [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Notional amount	1,262,964,000	972,002,000
Fair value, asset	49,998,000	43,602,000
Liability	1,000	128,000
Not Subject to Master Netting Arrangement [Member] | Equity Contracts [Member]
Derivatives, Fair Value [Line Items]
Notional amount	1,180,000	1,210,000
Liability	18,000	47,000
Not Subject to Master Netting Arrangement [Member] | Credit Risk Contract [Member]
Derivatives, Fair Value [Line Items]
Notional amount	114,753,000	$ 68,632,000
Fair value, asset	7,000
Liability	$ 133,000

Derivative Instruments - Additi

Derivative Instruments - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Derivative [Line Items]
Notional amount	$ 2,893,041,000	$ 2,215,056,000
Derivative assets	53,202,000	45,898,000
Derivative liabilities	51,605,000	46,160,000
Amounts reclassified from AOCI	(2,645,000)
Additional amount in excess of posted collateral required in case of breached agreements	1,333,000	1,862,000
Interest Rate Contracts [Member]
Derivative [Line Items]
Notional amount	$ 250,000,000	200,000,000
Period to reclassification of cash flow hedge gain loss	12 months
Maximum length of time hedged in interest rate cash flow hedge	8 years
Derivative gains to be reclassified within twelve months	$ 1,794,000
Derivative gains to be reclassified within twelve months, net of tax	1,166,000
Derivative gain or loses excluded from assessment of hedge effectiveness	0
Hedge ineffectiveness	0	0
Gains or losses from cash flow hedge derivatives reclassified to earnings	0	0
Interest Rate Contracts [Member] | Interest Income - Loans and Leases [Member]
Derivative [Line Items]
Derivative financial instrument, net	3,248,000	3,314,000
Interest Rate Contracts [Member] | Interest Income - Loans and Leases [Member] | Amount Reclassified from Other Comprehensive Income [Member]
Derivative [Line Items]
Derivative financial instrument, net	3,248,000
Amounts reclassified from AOCI	2,111,000
Interest Rate Contracts [Member] | Interest Expense - Short-term Borrowings [Member]
Derivative [Line Items]
Derivative financial instrument, net	292,000
Interest Rate Contracts [Member] | Interest Expense - Short-term Borrowings [Member] | Amount Reclassified from Other Comprehensive Income [Member]
Derivative [Line Items]
Derivative financial instrument, net	292,000
Amounts reclassified from AOCI	189,000
Interest Rate Swap [Member]
Derivative [Line Items]
Notional amount	1,262,964,000	972,002,000
Credit Risk Contract Sold [Member]
Derivative [Line Items]
Notional amount	$ 78,010,000
Risk participation agreements, minimum term	2 years
Risk participation agreements, maximum term	9 years
Maximum exposure under credit risk agreement assuming customer default	$ 133,000	25,000
Not for Trading Assets [Member] | Interest Rate Contracts [Member]
Derivative [Line Items]
Derivative assets	3,178,000	2,109,000
Trading Assets [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative assets	49,999,000	43,742,000
Not for Trading Liabilities [Member] | Interest Rate Contracts [Member]
Derivative [Line Items]
Derivative liabilities	962,000	2,330,000
Trading Liabilities [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative liabilities	$ 50,492,000	$ 43,783,000

Derivative Instruments - Offset

Derivative Instruments - Offsetting of Derivative Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Gross Amount	$ 53,202	$ 45,898
Gross Amounts Offset in the Balance Sheet, Derivative Assets	0	0
Net Amount Presented in the Balance Sheet	53,202	45,898
Credit Risk Contract [Member]
Derivatives, Fair Value [Line Items]
Gross Amount	7
Gross Amounts Offset in the Balance Sheet, Derivative Assets	0
Net Amount Presented in the Balance Sheet	7
Subject to Master Netting Arrangement [Member]
Derivatives, Fair Value [Line Items]
Net Amount Presented in the Balance Sheet	3,197	2,296
Subject to Master Netting Arrangement [Member] | Interest Rate Contracts [Member]
Derivatives, Fair Value [Line Items]
Gross Amount	3,178	2,109
Gross Amounts Offset in the Balance Sheet, Derivative Assets	0	0
Net Amount Presented in the Balance Sheet	3,178	2,109
Subject to Master Netting Arrangement [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Gross Amount	1	140
Gross Amounts Offset in the Balance Sheet, Derivative Assets	0	0
Net Amount Presented in the Balance Sheet	1	140
Subject to Master Netting Arrangement [Member] | Equity Contracts [Member]
Derivatives, Fair Value [Line Items]
Gross Amount	18	47
Gross Amounts Offset in the Balance Sheet, Derivative Assets	0	0
Net Amount Presented in the Balance Sheet	18	47
Not Subject to Master Netting Arrangement [Member]
Derivatives, Fair Value [Line Items]
Net Amount Presented in the Balance Sheet	50,005	43,602
Not Subject to Master Netting Arrangement [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Gross Amount	49,998	43,602
Gross Amounts Offset in the Balance Sheet, Derivative Assets	0	0
Net Amount Presented in the Balance Sheet	49,998	$ 43,602
Not Subject to Master Netting Arrangement [Member] | Credit Risk Contract [Member]
Derivatives, Fair Value [Line Items]
Net Amount Presented in the Balance Sheet	$ 7

Derivative Instruments - Off105

Derivative Instruments - Offsetting of Derivative Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Gross Amount	$ 51,605	$ 46,160
Gross Amounts Offset in the Balance Sheet, Derivative Liabilities	0	0
Net Amount Presented in the Balance Sheet	51,605	46,160
Subject to Master Netting Arrangement [Member]
Derivatives, Fair Value [Line Items]
Net Amount Presented in the Balance Sheet	51,453	45,985
Subject to Master Netting Arrangement [Member] | Interest Rate Contracts [Member]
Derivatives, Fair Value [Line Items]
Gross Amount	962	2,330
Gross Amounts Offset in the Balance Sheet, Derivative Liabilities	0	0
Net Amount Presented in the Balance Sheet	962	2,330
Subject to Master Netting Arrangement [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Gross Amount	50,491	43,655
Gross Amounts Offset in the Balance Sheet, Derivative Liabilities	0	0
Net Amount Presented in the Balance Sheet	50,491	43,655
Not Subject to Master Netting Arrangement [Member]
Derivatives, Fair Value [Line Items]
Net Amount Presented in the Balance Sheet	152	175
Not Subject to Master Netting Arrangement [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Gross Amount	1	128
Gross Amounts Offset in the Balance Sheet, Derivative Liabilities	0	0
Net Amount Presented in the Balance Sheet	1	128
Not Subject to Master Netting Arrangement [Member] | Credit Risk Contract [Member]
Derivatives, Fair Value [Line Items]
Gross Amount	133
Gross Amounts Offset in the Balance Sheet, Derivative Liabilities	0
Net Amount Presented in the Balance Sheet	133
Not Subject to Master Netting Arrangement [Member] | Equity Contracts [Member]
Derivatives, Fair Value [Line Items]
Gross Amount	18	47
Gross Amounts Offset in the Balance Sheet, Derivative Liabilities	0	0
Net Amount Presented in the Balance Sheet	$ 18	$ 47

Derivative Instruments - Deriva

Derivative Instruments - Derivative Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Derivative [Line Items]
Net Amount Presented in the Balance Sheet	$ 53,202	$ 45,898
Subject to Master Netting Arrangement [Member]
Derivative [Line Items]
Net Amount Presented in the Balance Sheet	3,197	2,296
Gross Amounts Not Offset in the Balance Sheet Financial Instruments, Derivative Assets	1,535	995
Gross Amounts Not Offset in the Balance Sheet Cash Collateral Received, Derivative Assets	1,662	1,301
Net Amount, Derivative Assets	0	0
Subject to Master Netting Arrangement [Member] | Interest Rate Contracts [Member]
Derivative [Line Items]
Net Amount Presented in the Balance Sheet	3,178	2,109
Gross Amounts Not Offset in the Balance Sheet Financial Instruments, Derivative Assets	1,516	810
Gross Amounts Not Offset in the Balance Sheet Cash Collateral Received, Derivative Assets	1,662	1,299
Net Amount, Derivative Assets	0	0
Subject to Master Netting Arrangement [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Net Amount Presented in the Balance Sheet	1	140
Gross Amounts Not Offset in the Balance Sheet Financial Instruments, Derivative Assets	1	138
Gross Amounts Not Offset in the Balance Sheet Cash Collateral Received, Derivative Assets		2
Net Amount, Derivative Assets	0	0
Subject to Master Netting Arrangement [Member] | Equity Contracts [Member]
Derivative [Line Items]
Net Amount Presented in the Balance Sheet	18	47
Gross Amounts Not Offset in the Balance Sheet Financial Instruments, Derivative Assets	18	47
Net Amount, Derivative Assets	$ 0	$ 0

Derivative Instruments - Der107

Derivative Instruments - Derivative Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Derivative [Line Items]
Net Amount Presented in the Balance Sheet	$ 51,605	$ 46,160
Subject to Master Netting Arrangement [Member]
Derivative [Line Items]
Net Amount Presented in the Balance Sheet	51,453	45,985
Gross Amount Not Offset in the Balance Sheet Financial Instruments, Derivative Liabilities	25,371	30,976
Gross Amount Not Offset in the Balance Sheet Cash Collateral Pledged, Derivative Liabilities	24,802	13,243
Net Amount, Derivative Liabilities	1,280	1,766
Subject to Master Netting Arrangement [Member] | Interest Rate Contracts [Member]
Derivative [Line Items]
Net Amount Presented in the Balance Sheet	962	2,330
Gross Amount Not Offset in the Balance Sheet Financial Instruments, Derivative Liabilities	792	2,330
Gross Amount Not Offset in the Balance Sheet Cash Collateral Pledged, Derivative Liabilities	170
Subject to Master Netting Arrangement [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Net Amount Presented in the Balance Sheet	50,491	43,655
Gross Amount Not Offset in the Balance Sheet Financial Instruments, Derivative Liabilities	24,579	28,646
Gross Amount Not Offset in the Balance Sheet Cash Collateral Pledged, Derivative Liabilities	24,632	13,243
Net Amount, Derivative Liabilities	$ 1,280	$ 1,766

Derivative Instruments - Effect

Derivative Instruments - Effect of Corporation's Derivative Financial Instruments on Income Statement (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Interest Rate Contracts [Member] | Interest Income - Loans and Leases [Member]
Derivative [Line Items]
Derivative financial instrument, net	$ 3,248	$ 3,314
Interest Rate Contracts [Member] | Interest Expense - Short-term Borrowings [Member]
Derivative [Line Items]
Derivative financial instrument, net	292
Interest Rate Swap [Member] | Other Income [Member]
Derivative [Line Items]
Derivative financial instrument, net	(451)	$ (123)
Credit Risk Contract [Member] | Other Income [Member]
Derivative [Line Items]
Derivative financial instrument, net	$ (126)

Commitments, Credit Risk and109

Commitments, Credit Risk and Contingencies - Summary of Off-Balance Sheet Credit Risk Information (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Commitments to Extend Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Extended credit and standby letters of credit	$ 3,781,719	$ 3,665,481
Standby Letters of Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Extended credit and standby letters of credit	$ 92,979	$ 121,186

Commitments, Credit Risk and110

Commitments, Credit Risk and Contingencies - Additional Information (Detail)	Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Percentage of Commitments to extend credit dependent upon the financial condition of the customers	73.30%

Stock Incentive Plans - Additio

Stock Incentive Plans - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Apr. 06, 2013	Jan. 01, 2012	Jun. 16, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock awards issued	664,337	387,165	361,664
Aggregate, weighted average grant date fair value	$ 8,802	$ 5,227	$ 4,014
Common stock shares available under incentive compensation plans	2,062,471
Unrecognized compensation expense	$ 9,279
Stock options exercised	93,822	690,973	69,429
Intrinsic value of outstanding and exercisable stock options	$ 2,050
Common shares available for purchase under warrants						651,042
Parkvale [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrant issued	819,640
Annapolis Bancorp, Inc. [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrant issued, exercise price	$ 3.38			$ 3.57
Warrant issued	342,564
Warrants converted to purchase common stock	364,843			342,564
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense related to restricted stock awards	$ 4,461	$ 3,584	$ 5,063
Tax benefit related to restricted stock awards	1,561	1,254	1,772
Total fair value of awards vested	6,070	$ 10,713	$ 8,259
Unrecognized compensation expense	9,279
Amount subject to accelerated vesting under Incentive Compensation Plan	$ 55
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options exercised	93,822	517,192	69,429
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares available for purchase under warrants	1,302,083
Warrant Expires in 2018 [Member] | Parkvale [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrant issued, exercise price					$ 5.81
Service-Based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of awards issued, years	3 years		3 years
Unrecognized compensation expense	$ 3,737
Performance-Based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of awards issued, years	3 years		4 years
Restricted stock awards issued	400,436	119,589
Unrecognized compensation expense	$ 5,542
Performance-Based Awards [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock percentage of number of units issued	175.00%
Performance-Based Awards [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock percentage of number of units issued	0.00%
Discretionary Service-Based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of awards issued, years			5 years
Warrant Expires in 2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrant issued, exercise price	$ 11.52
Warrant Expires in 2019 [Member] | Annapolis Bancorp, Inc. [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrant issued, exercise price				$ 3.57
Market Based Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock percentage of number of units issued	100.00%

Stock Incentive Plans - Summary

Stock Incentive Plans - Summary of Information Concerning Restricted Stock Awards (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Shares, Unvested shares outstanding at beginning of year	1,354,093	1,729,033	1,913,073
Shares, Granted	664,337	387,165	361,664
Shares, Net adjustment due to performance	13,115	(36,600)	165,545
Shares, Vested	(484,010)	(707,074)	(734,129)
Shares, Forfeited	(41,130)	(65,399)	(37,828)
Shares, Dividend reinvestment	42,039	46,968	60,708
Shares, Unvested shares outstanding at end of year	1,548,444	1,354,093	1,729,033
Weighted Average Grant Price per Share, Unvested Shares outstanding at beginning of year	$ 11.86	$ 10.23	$ 9.17
Weighted Average Grant Price per Share, Granted	13.25	13.50	11.10
Weighted Average Grant Price per Share, Net adjustment due to performance	19.74	12.01	9.60
Weighted Average Grant Price per Share, Vested	10.70	8.81	7.90
Weighted Average Grant Price per Share, Forfeited	13.24	11.72	10.42
Weighted Average Grant Price per Share, Dividend reinvestment	11.86	12.66	11.82
Weighted Average Grant Price per Share, Unvested Shares outstanding at end of year	$ 12.85	$ 11.86	$ 10.23

Stock Incentive Plans - Compone

Stock Incentive Plans - Components of Restricted Stock Awards (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested shares	1,548,444	1,354,093	1,729,033	1,913,073
Unrecognized compensation expense	$ 9,279
Intrinsic value	$ 20,657
Weighted average remaining life (in years)	2 years 3 months 22 days
Service-Based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested shares	632,054
Unrecognized compensation expense	$ 3,737
Intrinsic value	$ 8,432
Weighted average remaining life (in years)	1 year 11 months 1 day
Performance-Based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested shares	916,390
Unrecognized compensation expense	$ 5,542
Intrinsic value	$ 12,225
Weighted average remaining life (in years)	2 years 6 months 29 days

Stock Incentive Plans - Summ114

Stock Incentive Plans - Summary of Information Concerning Stock Option Awards (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Shares, Options outstanding at beginning of year	568,834	533,524	640,050
Shares, Assumed from acquisitions		805,507	274,964
Shares, Exercised	(93,822)	(690,973)	(69,429)
Shares, Forfeited	(39,672)	(79,224)	(312,061)
Shares, Options outstanding and exercisable at end of year	435,340	568,834	533,524
Weighted Average Price per Share, Options outstanding at beginning of year	$ 8.86	$ 11.50	$ 13.21
Weighted Average Price per Share, Assumed from acquisition		7.39	11.16
Weighted Average Price per Share, Exercised	5.94	7.75	7.46
Weighted Average Price per Share, Forfeited	15.66	21.40	15.58
Weighted Average Price per Share, Options outstanding and exercisable at end of year	$ 8.86	$ 8.86	$ 11.50

Stock Incentive Plans - Summ115

Stock Incentive Plans - Summary of Stock Options Outstanding (Detail)	12 Months Ended
	Dec. 31, 2015$ / sharesshares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding and Exercisable | shares	435,340
$3.45 - $5.18 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding and Exercisable | shares	147,461
Range of Exercise Prices, Minimum	$ 3.45
Range of Exercise Prices, Maximum	5.18
Weighted Average Exercise Price	$ 4.74
Weighted Average Remaining Contractual Years	4 years 1 month 13 days
$5.19 - $7.78 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding and Exercisable | shares	91,824
Range of Exercise Prices, Minimum	$ 5.19
Range of Exercise Prices, Maximum	7.78
Weighted Average Exercise Price	$ 6.17
Weighted Average Remaining Contractual Years	1 year 8 months 9 days
$11.69 - $17.54 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding and Exercisable | shares	190,285
Range of Exercise Prices, Minimum	$ 11.69
Range of Exercise Prices, Maximum	17.54
Weighted Average Exercise Price	$ 12.68
Weighted Average Remaining Contractual Years	1 year 8 months 27 days
$26.33 - $36.42 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding and Exercisable | shares	5,770
Range of Exercise Prices, Minimum	$ 26.33
Range of Exercise Prices, Maximum	36.42
Weighted Average Exercise Price	$ 31.25
Weighted Average Remaining Contractual Years	10 months 2 days

Stock Incentive Plans - Summ116

Stock Incentive Plans - Summary of Stock Options Exercised (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Proceeds from stock options exercised	$ 557	$ 3,292	$ 365
Tax benefit recognized from stock options exercised	130	808	79
Intrinsic value of stock options exercised	$ 693	$ 3,289	$ 318

Retirement Plans - Additional I

Retirement Plans - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2015USD ($)RetirementPlansshares	Dec. 31, 2014USD ($)shares	Dec. 31, 2013USD ($)	Dec. 31, 2008
Retirement Plans [Line Items]
Number of supplemental non-qualified retirement plans sponsored by the Corporation | RetirementPlans	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%
Percentage of non callable corporate bonds	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.
Benefits paid	$ 8,411,000	$ 10,533,000
Employer contributions to the qualified pension plans	$ 0	0
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	$ 8,055,000	10,188,000	$ 9,300,000
Dividends received on common stock	$ 276,000	$ 272,000
Equity Securities [Member]
Retirement Plans [Line Items]
Common stock, shares | shares	575,128	575,128
Percentage of common stock on total plan assets	5.80%	5.50%
Qualified Pension Plans [Member]
Retirement Plans [Line Items]
Benefits paid	$ 7,047,000	$ 9,211,000
Non-Qualified Pension Plans [Member]
Retirement Plans [Line Items]
Benefits paid	$ 1,364,000	$ 1,322,000

Retirement Plans - Schedule of

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 ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]
Accumulated benefit obligation	$ 150,754	$ 156,589
Projected benefit obligation at beginning of year	156,924	139,731
Service cost	(14)	62
Interest cost	5,897	6,411
Actuarial (gain) loss	(3,381)	21,253
Benefits paid	(8,411)	(10,533)
Projected benefit obligation at end of year	151,015	156,924
Fair value of plan assets at beginning of year	140,140	139,737
Actual return on plan assets	(331)	9,613
Corporation contribution	1,364	1,323
Benefits paid	(8,411)	(10,533)
Fair value of plan assets at end of year	132,762	140,140
Funded status of plans	$ (18,253)	$ (16,784)

Retirement Plans - Schedule 119

Retirement Plans - Schedule of Actuarial Assumptions Used in Determination of Projected Benefit Obligation (Detail)	Dec. 31, 2015	Dec. 31, 2014
Schedule Of Sale Of Subsidiary [Abstract]
Weighted average discount rate	4.19%	3.85%
Rates of average increase in compensation levels	3.50%	4.00%

Retirement Plans - Schedule 120

Retirement Plans - Schedule of Net Periodic Pension Cost and Other Comprehensive Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ (14)	$ 62
Interest cost	5,897	6,411
Defined Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	(14)	62	$ 65
Interest cost	5,897	6,411	5,728
Expected return on plan assets	(9,964)	(9,946)	(9,081)
Transition amount amortization		(21)	(93)
Prior service credit amortization	7	7	7
Actuarial loss amortization	2,112	1,367	2,263
Net periodic pension cost (gain)	(1,962)	(2,120)	(1,111)
Current year actuarial loss (gain)	6,914	21,586	(20,938)
Amortization of actuarial loss	(2,112)	(1,367)	(2,263)
Amortization of prior service credit	(7)	(7)	(7)
Amortization of transition asset		21	93
Total recognized in other comprehensive income	4,795	20,233	(23,115)
Total recognized in net periodic pension cost (gain) and other comprehensive income	$ 2,833	$ 18,113	$ (24,226)

Retirement Plans - Schedule 121

Retirement Plans - Schedule of Actuarial Assumptions Used in Determination of Net Periodic Pension Cost (Detail)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Compensation and Retirement Disclosure [Abstract]
Weighted average discount rate	3.85%	4.67%	3.78%
Rates of increase in compensation levels	4.00%	4.00%	4.00%
Expected long-term rate of return on assets	7.25%	7.25%	7.25%

Retirement Plans - Schedule 122

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 ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 151,015	$ 156,924	$ 139,731
Accumulated benefit obligation	150,754	156,589
Fair value of plan assets	132,762	140,140	$ 139,737
Qualified Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	130,797	135,998
Accumulated benefit obligation	130,797	135,998
Fair value of plan assets	132,762	140,140
Non-Qualified Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	20,218	20,926
Accumulated benefit obligation	$ 19,957	$ 20,591

Retirement Plans - Schedule 123

Retirement Plans - Schedule of Impact of Changes in Discount Rate, Return on Plan Assets on Pension Expense (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)
Compensation and Retirement Disclosure [Abstract]
0.5% decrease in the discount rate, Estimated Effect on Pension Expense	$ (33)
0.5% decrease in the expected long-term rate of return on plan assets, Estimated Effect on Pension Expense	$ 687

Retirement Plans - Schedule 124

Retirement Plans - Schedule of Estimated Future Cash Flows (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)
Compensation and Retirement Disclosure [Abstract]
Expected employer contributions:2016	$ 1,350
Expected benefit payments:2016	7,244
Expected benefit payments: 2017	9,413
Expected benefit payments: 2018	8,177
Expected benefit payments: 2019	8,433
Expected benefit payments: 2020	8,731
Expected benefit payments: 2021 - 2025	$ 45,879

Retirement Plans - Schedule 125

Retirement Plans - Schedule of Asset Allocations for Pension Plans (Detail)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
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	39.00%	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	4.00%	3.00%

Retirement Plans - Schedule 126

Retirement Plans - Schedule of Fair Value of Pension Plan Assets by Asset Category (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 132,762	$ 140,140	$ 139,737
Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4,847	3,970
F.N.B. Corporation [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7,672	7,661
Other Large-Cap U.S. Financial Services Companies [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,541	2,653
Other Large-Cap U.S. Companies [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	33,387	34,286
International Companies [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	521	730
Other Equity [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	596	583
Non-U.S. Equities Growth Fund [Member] | Mutual Fund Equity Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	9,613	9,986
Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5,540	5,643
U.S. Government Agencies [Member] | Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	40,735	44,417
U.S. Investment-Grade Fixed Income Securities [Member] | Fixed Income Mutual Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	10,648	10,993
Non-U.S. Fixed Income Securities [Member] | Fixed Income Mutual Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	412	445
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	511	1,504
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	2,607	2,946
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	3,464	3,803
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	6,989	7,501
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	2,679	3,019
Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	92,027	95,723
Level 1 [Member] | Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4,847	3,970
Level 1 [Member] | F.N.B. Corporation [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7,672	7,661
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	2,541	2,653
Level 1 [Member] | Other Large-Cap U.S. Companies [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	33,387	34,286
Level 1 [Member] | International Companies [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	521	730
Level 1 [Member] | Other Equity [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	596	583
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	9,613	9,986
Level 1 [Member] | Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5,540	5,643
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	10,648	10,993
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	412	445
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	511	1,504
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	2,607	2,946
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	3,464	3,803
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	6,989	7,501
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	2,679	3,019
Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	40,735	44,417
Level 2 [Member] | U.S. Government Agencies [Member] | Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 40,735	$ 44,417

Income Taxes - Summary of Incom

Income Taxes - Summary of Income Tax Expense Allocated Based on Separate Tax Return Basis (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Current income taxes: Federal taxes	$ 69,572	$ 18,111	$ 33,614
Current income taxes: State taxes	989	396	(116)
Current income taxes	70,561	18,507	33,498
Deferred income taxes: Federal taxes	63	44,113	11,258
Deferred income taxes: State taxes	(631)
Deferred income taxes	(568)	44,113	11,258
Income taxes	$ 69,993	$ 62,620	$ 44,756

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Contingency [Line Items]
Income tax expense related to gains on the sale of securities	$ 288	$ 4,101	$ 283
Reversal of valuation allowance recorded against state deferred taxes	1,872
Unrecognized tax benefits	455	401	$ 660
Unrecognized tax benefits relating to accrued interest, net of related federal tax benefits	18	$ 19
Unrecognized tax benefits which affect the effective tax rate if recognized	313
Reduction in the unrecognized tax benefit due to statutes of limitations for next twelve months	$ 60
Minimum [Member]
Income Tax Contingency [Line Items]
Expiration of unused state net operating loss carryforwards	2,018
Maximum [Member]
Income Tax Contingency [Line Items]
Expiration of unused state net operating loss carryforwards	2,035

Income Taxes - Summary of Defer

Income Taxes - Summary of Deferred Tax Assets and Liabilities from Tax Effects of Temporary Differences (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Allowance for credit losses	$ 50,414	$ 44,613
Discount on purchased loans	28,503	31,787
Net operating loss/tax credit carryforwards	16,487	15,367
Deferred compensation	8,515	7,785
Securities impairments	252	412
Pension and other defined benefit plans	8,539	6,871
Net unrealized securities losses	1,301
Other	8,020	9,503
Total	122,031	116,338
Valuation allowance	(17,179)	(15,505)
Total deferred tax assets	104,852	100,833
Loan costs	(2,966)	(1,497)
Depreciation	(10,836)	(11,533)
Prepaid expenses	(628)	(705)
Amortizable intangibles	(12,940)	(13,842)
Lease financing	(6,763)	(7,302)
Debt discharge income deferral	(2,042)	(2,829)
Originated mortgage servicing rights	(1,238)	(2,721)
Other	(1,928)
Total deferred tax liabilities	(39,341)	(40,429)
Net deferred tax assets	$ 65,511	$ 60,404

Income Taxes - Summary of Recon

Income Taxes - Summary of Reconciliation Between the Statutory Tax Rate and Actual Effective Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Statutory tax rate	35.00%	35.00%	35.00%
State taxes, net of federal benefit	0.80%	0.10%	0.20%
Valuation allowance reversal	(0.80%)
Tax-exempt interest	(2.20%)	(1.80%)	(2.90%)
Cash surrender value of life insurance	(1.30%)	(1.30%)	(1.80%)
Tax credits	(1.10%)	(1.40%)	(2.40%)
Other items	0.10%	(0.30%)	(0.60%)
Actual effective tax rate	30.50%	30.30%	27.50%

Income Taxes - Summary of Re131

Income Taxes - Summary of Reconciliation of the Beginning and Ending Amount of Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Balance at beginning of year	$ 401	$ 660
Additions based on tax positions related to current year	134	60
Additions based on tax positions of prior year	0	0
Reductions for tax positions of prior years	0	0
Reductions due to expiration of statute of limitations	(80)	(319)
Balance at end of year	$ 455	$ 401

Comprehensive Income - Changes

Comprehensive Income - Changes in AOCI, Net of Tax, by Component (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), balance at beginning of period	$ (46,003)
Other comprehensive income (loss) before reclassifications	(2,485)
Amounts reclassified from AOCI	(2,645)
Net current period other comprehensive income (loss)	(5,130)	$ 10,921	$ (10,700)
Accumulated other comprehensive income (loss), balance at end of period	(51,133)	(46,003)
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	(440)
Other comprehensive income (loss) before reclassifications	(2,899)
Amounts reclassified from AOCI	(534)
Net current period other comprehensive income (loss)	(3,433)
Accumulated other comprehensive income (loss), balance at end of period	(3,873)	(440)
Unrealized Losses on Derivative Instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), balance at beginning of period	(143)
Other comprehensive income (loss) before reclassifications	3,694
Amounts reclassified from AOCI	(2,111)
Net current period other comprehensive income (loss)	1,583
Accumulated other comprehensive income (loss), balance at end of period	1,440	(143)
Unrecognized Pension and Postretirement Obligations [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), balance at beginning of period	(45,420)
Other comprehensive income (loss) before reclassifications	(3,280)
Net current period other comprehensive income (loss)	(3,280)
Accumulated other comprehensive income (loss), balance at end of period	$ (48,700)	$ (45,420)

Earnings Per Share - Computatio

Earnings Per Share - Computation of Basic and Diluted Earnings Per Common Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Earnings Per Share [Abstract]
Net income	$ 159,649	$ 144,050	$ 117,804
Less: Preferred stock dividends	8,041	8,352
Net income available to common stockholders	$ 151,608	$ 135,698	$ 117,804
Basic weighted average common shares outstanding	174,971,785	167,347,906	146,186,982
Net effect of dilutive stock options, warrants, restricted stock and convertible debt	1,367,168	1,730,939	1,622,522
Diluted weighted average common shares outstanding	176,338,953	169,078,845	147,809,504
Basic earnings per common share	$ 0.87	$ 0.81	$ 0.81
Diluted earnings per common share	$ 0.86	$ 0.80	$ 0.80

Earnings Per Share - Additional

Earnings Per Share - Additional Information (Detail) - shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Earnings Per Share [Abstract]
Common stock excluded from computation of diluted earnings per share	18,167	35,442	49,995

Regulatory Matters - Additional

Regulatory Matters - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Regulatory Matters [Line Items]
Redemption in capital TPS			$ 33,000
Redemption of Corporation Issued TPS			$ 33,000
Aggregate cash reserves with Federal Reserve Bank		$ 6,139
Retained earnings available for distribution		181,131
Maximum amount loans that Corporation can borrower under current provisions		225,440
Scenario, Forecast [Member] | Omega Financial Capital Trust I [Member]
Regulatory Matters [Line Items]
Redemption of Corporation Issued TPS	$ 10,000
Tier 1 Capital [Member]
Regulatory Matters [Line Items]
Trust Preferred Securities		$ 14,375
Percentage of TPS included in capital		25.00%
Tier 2 Capital [Member]
Regulatory Matters [Line Items]
Percentage of TPS included in capital		75.00%

Regulatory Matters - Schedule o

Regulatory Matters - Schedule of Capital Ratios (Detail) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
F.N.B. Corporation [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital, Actual Amount	$ 1,629,270,000	$ 1,417,369,000
Tier 1 Capital, Actual Amount	1,321,972,000	1,269,033,000
Common equity tier 1, Actual Amount	1,200,715,000
Leverage, Actual Amount	$ 1,321,972,000	$ 1,269,033,000
Total Capital, Actual Ratio	12.90%	12.40%
Tier 1 Capital, Actual Ratio	10.40%	11.10%
Common equity tier 1, Actual Ratio	9.50%
Leverage, Actual Ratio	8.10%	8.40%
Total Capital, Well-Capitalized Requirements Amount	$ 1,268,396,000	$ 1,146,556,000
Tier 1 Capital, Well-Capitalized Requirements Amount	1,014,717,000	687,934,000
Common equity tier 1, Well-Capitalized Requirements Amount	824,457,000
Leverage, Well-Capitalized Requirements Amount	$ 811,553,000	$ 752,593,000
Total capital, Well-Capitalized Requirements Ratio	10.00%	10.00%
Tier 1 capital, Well-Capitalized Requirements Ratio	8.00%	6.00%
Common equity tier 1, Well-Capitalized Requirements Ratio	6.50%
Leverage, Well-Capitalized Requirements Ratio	5.00%	5.00%
Total capital, Minimum Capital Requirements Amount	$ 1,014,717,000	$ 917,245,000
Tier 1 capital, Minimum Capital Requirements Amount	761,038,000	458,623,000
Common equity tier 1, Minimum Capital Requirements Amount	570,778,000
Leverage, Minimum Capital Requirements Amount	$ 649,243,000	$ 602,074,000
Total capital, Minimum Capital Requirements Ratio	8.00%	8.00%
Tier 1 capital, Minimum Capital Requirements Ratio	6.00%	4.00%
Common equity tier 1, Minimum Capital Requirements Ratio	4.50%
Leverage, Minimum Capital Requirements Ratio	4.00%	4.00%
FNBPA [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital, Actual Amount	$ 1,426,284,000	$ 1,321,433,000
Tier 1 Capital, Actual Amount	1,289,965,000	1,200,776,000
Common equity tier 1, Actual Amount	1,209,965,000
Leverage, Actual Amount	$ 1,289,965,000	$ 1,200,776,000
Total Capital, Actual Ratio	11.30%	11.50%
Tier 1 Capital, Actual Ratio	10.20%	10.50%
Common equity tier 1, Actual Ratio	9.60%
Leverage, Actual Ratio	8.00%	8.10%
Total Capital, Well-Capitalized Requirements Amount	$ 1,265,990,000	$ 1,147,427,000
Tier 1 Capital, Well-Capitalized Requirements Amount	1,012,792,000	688,456,000
Common equity tier 1, Well-Capitalized Requirements Amount	822,893,000
Leverage, Well-Capitalized Requirements Amount	$ 803,041,000	$ 744,235,000
Total capital, Well-Capitalized Requirements Ratio	10.00%	10.00%
Tier 1 capital, Well-Capitalized Requirements Ratio	8.00%	6.00%
Common equity tier 1, Well-Capitalized Requirements Ratio	6.50%
Leverage, Well-Capitalized Requirements Ratio	5.00%	5.00%
Total capital, Minimum Capital Requirements Amount	$ 1,012,792,000	$ 917,941,000
Tier 1 capital, Minimum Capital Requirements Amount	759,594,000	458,971,000
Common equity tier 1, Minimum Capital Requirements Amount	569,695,000
Leverage, Minimum Capital Requirements Amount	$ 642,433,000	$ 595,388,000
Total capital, Minimum Capital Requirements Ratio	8.00%	8.00%
Tier 1 capital, Minimum Capital Requirements Ratio	6.00%	4.00%
Common equity tier 1, Minimum Capital Requirements Ratio	4.50%
Leverage, Minimum Capital Requirements Ratio	4.00%	4.00%

Cash Flow Information - Summary

Cash Flow Information - Summary of Cash Flow Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Cash Flows [Abstract]
Interest paid on deposits and other borrowings	$ 47,805	$ 43,057	$ 46,337
Income taxes paid	61,500	27,000	34,200
Transfers of loans to other real estate owned	9,628	16,535	15,836
Transfers of other real estate owned to loans	$ 372	$ 390	$ 701

Business Segments - Additional

Business Segments - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2015Segment
Segment Reporting [Abstract]
Number of reportable segments	4

Business Segments - Financial I

Business Segments - Financial Information for Segments of Corporation (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Interest income	$ 546,795	$ 508,983	$ 440,386
Interest expense	48,573	42,686	44,344
Net interest income	498,222	466,297	396,042
Provision for credit losses	40,441	38,648	31,090
Non-interest income	162,410	158,274	135,778
Non-interest expense	382,244	369,536	329,763
Intangible amortization	8,305	9,717	8,407
Income tax expense (benefit)	69,993	62,620	44,756
Net income (loss)	159,649	144,050	117,804
Total assets	17,557,662	16,127,090	13,563,405
Total intangibles	878,730	879,717	811,856
Operating Segments [Member] | Community Banking [Member]
Segment Reporting Information [Line Items]
Interest income	500,030	463,376	396,243
Interest expense	41,227	36,318	32,178
Net interest income	458,803	427,058	364,065
Provision for credit losses	32,125	30,872	23,502
Non-interest income	116,141	115,858	97,156
Non-interest expense	319,923	311,834	271,657
Intangible amortization	7,544	9,025	7,697
Income tax expense (benefit)	65,071	57,634	43,966
Net income (loss)	150,281	133,551	114,399
Total assets	17,374,384	15,944,040	13,381,047
Total intangibles	853,551	857,066	788,513
Operating Segments [Member] | Wealth Management [Member]
Segment Reporting Information [Line Items]
Non-interest income	35,246	31,497	28,717
Non-interest expense	27,264	25,338	25,067
Intangible amortization	273	288	304
Income tax expense (benefit)	2,803	2,135	1,248
Net income (loss)	4,906	3,736	2,098
Total assets	20,753	20,877	20,959
Total intangibles	10,447	10,720	11,008
Operating Segments [Member] | Insurance [Member]
Segment Reporting Information [Line Items]
Interest income	89	98	109
Net interest income	89	98	109
Non-interest income	13,052	13,598	13,175
Non-interest expense	13,891	11,558	11,448
Intangible amortization	488	404	406
Income tax expense (benefit)	(412)	625	519
Net income (loss)	(826)	1,109	911
Total assets	22,207	19,222	20,214
Total intangibles	12,923	10,122	10,526
Operating Segments [Member] | Consumer Finance [Member]
Segment Reporting Information [Line Items]
Interest income	39,868	38,914	37,956
Interest expense	3,518	3,352	3,378
Net interest income	36,350	35,562	34,578
Provision for credit losses	7,396	6,920	6,834
Non-interest income	2,926	2,919	2,794
Non-interest expense	20,189	19,692	19,052
Income tax expense (benefit)	4,709	4,430	4,320
Net income (loss)	6,982	7,439	7,166
Total assets	195,048	187,796	188,259
Total intangibles	1,809	1,809	1,809
Parent and Other [Member]
Segment Reporting Information [Line Items]
Interest income	6,808	6,595	6,078
Interest expense	3,828	3,016	8,788
Net interest income	2,980	3,579	(2,710)
Provision for credit losses	920	856	754
Non-interest income	(4,955)	(5,598)	(6,064)
Non-interest expense	977	1,114	2,539
Income tax expense (benefit)	(2,178)	(2,204)	(5,297)
Net income (loss)	(1,694)	(1,785)	(6,770)
Total assets	$ (54,730)	$ (44,845)	$ (47,074)

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Fair Value Measurements Disclosure [Line Items]
Percentage of securities using market-based information	99.90%
Percentage of securities using model-based techniques	0.10%
Minimum reserves for commercial loan	$ 500,000
Transfer of equity security to non-marketable equity securities, included in other assets	56,000
Impaired loans, carrying amount	70,689,000	$ 69,450,000
Allocated allowance for loan losses	2,650,000
Fair value of allocated allowance	3,828,000
Estimated costs to sell	39,000
Provision for fair value measurements included in allowance for loan losses	1,494,000
Carrying amount of OREO	9,960,000
Written down of OREO	6,950,000
Fair value of OREO	7,831,000
Estimated cost to sell OREO	881,000
Loss from OREO included in earnings	$ 3,010,000
Short-term borrowings approximate fair value for amounts that mature, days, less than	90 days
Fair Value, Measurements, Nonrecurring [Member]
Fair Value Measurements Disclosure [Line Items]
Impaired loans, carrying amount	$ 6,439,000
Allocated allowance for loan losses	3,828,000	1,705,000
Fair value of OREO	7,831,000	8,060,000
Assets Still Held [Member]
Fair Value Measurements Disclosure [Line Items]
Change in unrealized gains or losses included in earnings relating to assets still held	$ 0	$ 0

Fair Value Measurements - Balan

Fair Value Measurements - Balances of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value, Available for sale securities	$ 1,630,567	$ 1,534,065	$ 1,141,650
Derivative assets	53,202	45,898
Derivative liabilities	51,605	46,160
U.S. Treasury [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value, Available for sale debt securities	29,796	29,682
U.S. Government-Sponsored Entities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value, Available for sale debt securities	367,994	337,133	330,985
Agency Collateralized Mortgage Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value, Available for sale debt securities	495,830	573,171	491,199
Assets measured at fair value, Available for sale securities	495,830
Non-Agency Collateralized Mortgage Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value, Available for sale debt securities	1,190	1,431	1,762
Assets measured at fair value, Available for sale securities	1,190
Commercial Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value, Available for sale debt securities	4,287	7,880
Assets measured at fair value, Available for sale securities	4,287
States of the U.S. and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value, Available for sale debt securities	11,057	13,158	17,002
Other Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value, Available for sale debt securities	14,286	16,178	$ 16,100
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value, Available for sale securities	225	218
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value, Available for sale securities	1,628,719	1,531,952
Derivative assets	53,202	45,898
Derivative liabilities	51,605	46,160
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value, Available for sale securities	1,623	1,895
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value, Available for sale debt securities	1,629,271	1,532,718
Assets measured at fair value, Available for sale equity securities	1,296	1,347
Assets measured at fair value, Available for sale securities	1,630,567	1,534,065
Derivative assets	53,202	45,898
Assets measured at fair value, Total	1,683,769	1,579,963
Liabilities measured at fair value, Total	51,605	46,160
Fair Value, Measurements, Recurring [Member] | U.S. Treasury [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value, Available for sale debt securities	29,796	29,682
Fair Value, Measurements, Recurring [Member] | U.S. Government-Sponsored Entities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value, Available for sale debt securities	367,994	337,133
Fair Value, Measurements, Recurring [Member] | Agency Collateralized Mortgage Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value, Available for sale debt securities	495,830	573,171
Fair Value, Measurements, Recurring [Member] | Non-Agency Collateralized Mortgage Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value, Available for sale debt securities	1,190	1,431
Fair Value, Measurements, Recurring [Member] | Commercial Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value, Available for sale debt securities	4,287	7,880
Fair Value, Measurements, Recurring [Member] | States of the U.S. and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value, Available for sale debt securities	11,057	13,158
Fair Value, Measurements, Recurring [Member] | Other Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value, Available for sale debt securities	14,286	16,178
Fair Value, Measurements, Recurring [Member] | Trading Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	50,017	43,789
Fair Value, Measurements, Recurring [Member] | Not for Trading Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	3,185	2,109
Fair Value, Measurements, Recurring [Member] | Financial Services Industry [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value, Available for sale equity securities	1,168	1,228
Fair Value, Measurements, Recurring [Member] | Insurance Services Industry [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value, Available for sale equity securities	128	119
Fair Value, Measurements, Recurring [Member] | Agency Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value, Available for sale debt securities	704,831	554,085
Fair Value, Measurements, Recurring [Member] | Trading Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	50,510	43,830
Fair Value, Measurements, Recurring [Member] | Not for Trading Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	1,095	2,330
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value, Available for sale equity securities	225	218
Assets measured at fair value, Available for sale securities	225	218
Assets measured at fair value, Total	225	218
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Financial Services Industry [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value, Available for sale equity securities	97	99
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Insurance Services Industry [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value, Available for sale equity securities	128	119
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value, Available for sale debt securities	1,628,087	1,531,298
Assets measured at fair value, Available for sale equity securities	632	654
Assets measured at fair value, Available for sale securities	1,628,719	1,531,952
Derivative assets	53,202	45,898
Assets measured at fair value, Total	1,681,921	1,577,850
Liabilities measured at fair value, Total	51,605	46,160
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | U.S. Treasury [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value, Available for sale debt securities	29,796	29,682
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | U.S. Government-Sponsored Entities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value, Available for sale debt securities	367,994	337,133
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Agency Collateralized Mortgage Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value, Available for sale debt securities	495,830	573,171
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Non-Agency Collateralized Mortgage Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value, Available for sale debt securities	6	11
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Commercial Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value, Available for sale debt securities	4,287	7,880
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | States of the U.S. and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value, Available for sale debt securities	11,057	13,158
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Other Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value, Available for sale debt securities	14,286	16,178
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Trading Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	50,017	43,789
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Not for Trading Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	3,185	2,109
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Financial Services Industry [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value, Available for sale equity securities	632	654
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Agency Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value, Available for sale debt securities	704,831	554,085
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Trading Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	50,510	43,830
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Not for Trading Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	1,095	2,330
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value, Available for sale debt securities	1,184	1,420
Assets measured at fair value, Available for sale equity securities	439	475
Assets measured at fair value, Available for sale securities	1,623	1,895
Assets measured at fair value, Total	1,623	1,895
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Non-Agency Collateralized Mortgage Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value, Available for sale debt securities	1,184	1,420
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Financial Services Industry [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value, Available for sale equity securities	$ 439	$ 475

Fair Value Measurements - Ad142

Fair Value Measurements - Additional Information about Assets Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	$ 1,895	$ 33,749
Total gains (losses) - realized/unrealized, Included in earnings		13,766
Total gains (losses) - realized/unrealized, Included in other comprehensive income	16	5,676
Accretion included in earnings	5	662
Purchases	0	0
Issuances	0	0
Sales/redemptions		(51,527)
Settlements	(237)	(431)
Transfers from Level 3	(56)
Transfers into Level 3	0	0
Balance at end of period	1,623	1,895
Pooled Trust Preferred Collateralized Debt Obligations [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period		31,595
Total gains (losses) - realized/unrealized, Included in earnings		13,766
Total gains (losses) - realized/unrealized, Included in other comprehensive income		5,608
Accretion included in earnings		657
Purchases	0	0
Issuances	0	0
Sales/redemptions		(51,527)
Settlements		(99)
Transfers into Level 3	0	0
Equity Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	475	410
Total gains (losses) - realized/unrealized, Included in other comprehensive income	20	65
Purchases	0	0
Issuances	0	0
Transfers from Level 3	(56)
Transfers into Level 3	0	0
Balance at end of period	439	475
Residential Non-Agency Collateralized Mortgage Obligations [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	1,420	1,744
Total gains (losses) - realized/unrealized, Included in other comprehensive income	(4)	3
Accretion included in earnings	5	5
Purchases	0	0
Issuances	0	0
Settlements	(237)	(332)
Transfers into Level 3	0	0
Balance at end of period	$ 1,184	$ 1,420

Fair Value Measurements - Ad143

Fair Value Measurements - Additional Information about Assets Measured at Fair Value on Non-Recurring Basis (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	$ 2,650
Other real estate owned	7,831
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	3,828	$ 1,705
Other real estate owned	7,831	8,060
Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	124	177
Other real estate owned	5,705	5,695
Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	3,704	1,528
Other real estate owned	$ 2,126	$ 2,365

Fair Value Measurements - Fair

Fair Value Measurements - Fair Values of Corporation's Financial Instruments (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 489,119	$ 287,393	$ 213,981	$ 239,044
Securities available for sale	1,630,567	1,534,065	1,141,650
Securities held to maturity	1,637,061	1,453,355	1,199,169
Securities held to maturity	1,643,416	1,468,258	$ 1,189,563
Derivative assets	53,202	45,898
Deposits	12,623,463	11,382,208
Short-term borrowings	2,048,896	2,041,658
Long-term borrowings	641,480	541,443
Derivative liabilities	51,605	46,160
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	489,119	287,393
Securities available for sale	1,630,567	1,534,065
Securities held to maturity	1,643,416	1,468,258
Net loans, including loans held for sale	11,863,882	10,956,544
Derivative assets	53,202	45,898
Accrued interest receivable	44,920	40,231
Deposits	12,610,914	11,382,402
Short-term borrowings	2,048,943	2,041,672
Long-term borrowings	637,935	539,007
Derivative liabilities	51,605	46,160
Accrued interest payable	7,457	6,689
Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	489,119	287,393
Securities available for sale	1,630,567	1,534,065
Securities held to maturity	1,637,061	1,453,355
Net loans, including loans held for sale	12,053,209	11,127,292
Derivative assets	53,202	45,898
Accrued interest receivable	44,920	40,231
Deposits	12,623,463	11,382,208
Short-term borrowings	2,048,896	2,041,658
Long-term borrowings	641,480	541,443
Derivative liabilities	51,605	46,160
Accrued interest payable	7,457	6,689
Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	489,119	287,393
Securities available for sale	225	218
Accrued interest receivable	44,920	40,231
Deposits	10,157,997	8,771,173
Short-term borrowings	2,048,943	2,041,672
Accrued interest payable	7,457	6,689
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available for sale	1,628,719	1,531,952
Securities held to maturity	1,640,721	1,463,945
Derivative assets	53,202	45,898
Deposits	2,452,917	2,611,229
Derivative liabilities	51,605	46,160
Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available for sale	1,623	1,895
Securities held to maturity	2,695	4,313
Net loans, including loans held for sale	11,863,882	10,956,544
Long-term borrowings	$ 637,935	$ 539,007

Parent Company Financial Sta145

Parent Company Financial Statements - Consolidated Balance Sheet of Parent Company Only (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash and cash equivalents	$ 489,119	$ 287,393	$ 213,981	$ 239,044
Securities available for sale	1,630,567	1,534,065	1,141,650
Other assets	401,704	374,741
Total Assets	17,557,662	16,127,090	13,563,405
Other liabilities	147,641	140,325
Long-term borrowings	641,480	541,443
Long-term	84,668	83,155
Total Liabilities	15,461,480	14,105,634
Stockholders' Equity	2,096,182	2,021,456	1,774,383	1,402,069
Total Liabilities and Stockholders' Equity	17,557,662	16,127,090
Parent Company [Member]
Cash and cash equivalents	227,554	129,320	$ 145,910	$ 114,654
Securities available for sale	1,168	1,228
Other assets	17,206	16,615
Total Assets	2,579,621	2,408,624
Other liabilities	26,831	25,772
Advances from affiliates	289,540	292,337
Long-term borrowings	157,777	59,279
Short-term	8,216	8,351
Long-term	1,075	1,429
Total Liabilities	483,439	387,168
Stockholders' Equity	2,096,182	2,021,456
Total Liabilities and Stockholders' Equity	2,579,621	2,408,624
Parent Company [Member] | Bank Subsidiary [Member]
Investment in and advances to subsidiaries	2,073,352	2,006,808
Parent Company [Member] | Non-bank Subsidiaries [Member]
Investment in and advances to subsidiaries	$ 260,341	$ 254,653

Parent Company Financial Sta146

Parent Company Financial Statements - Statements of Income of Parent Company Only (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Dividend income from subsidiaries	$ 39	$ 228	$ 103
Interest income	546,795	508,983	440,386
Other income	117	94	129
Interest expense	48,573	42,686	44,344
Income tax benefit	(69,993)	(62,620)	(44,756)
Net Income	159,649	144,050	117,804
Parent Company [Member]
Dividend income from subsidiaries	95,443	94,900	83,103
Interest income	4,845	4,856	5,277
Equity in undistributed income (loss) of subsidiaries	71,739	55,631	43,804
Other income	1,053	1,920	1,874
Total Income	101,341	101,676	90,254
Interest expense	9,526	8,503	14,325
Other expenses	8,993	9,252	8,196
Total Expenses	18,519	17,755	22,521
Income Before Taxes and Equity in Undistributed Income of Subsidiaries	82,822	83,921	67,733
Income tax benefit	5,088	4,498	6,267
Income after income taxes	87,910	88,419	74,000
Net Income	159,649	144,050	117,804
Parent Company [Member] | Bank [Member]
Dividend income from subsidiaries	87,580	85,000	77,153
Equity in undistributed income (loss) of subsidiaries	71,581	55,742	42,094
Parent Company [Member] | Non-Bank [Member]
Dividend income from subsidiaries	7,863	9,900	5,950
Equity in undistributed income (loss) of subsidiaries	$ 158	$ (111)	$ 1,710

Parent Company Financial Sta147

Parent Company Financial Statements - Statements of Cash Flows of Parent Company Only (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Supplemental Cash Flow Information [Line Items]
Net income	$ 159,649	$ 144,050	$ 117,804
Other, net	(11,333)	(34,746)	14,280
Net cash flows provided by operating activities	223,480	446,819	346,093
Proceeds from sale of securities available for sale	33,499	175,872	22,047
Net cash received (paid) in business combinations	144,629	59,980	141,637
Net cash flows used in investing activities	(1,142,666)	(1,738,256)	(604,419)
Decrease in long-term debt	(34,968)	(96,906)	(247,988)
Increase in long-term debt	134,953	385,656	92,583
Net proceeds from issuance of preferred stock			106,882
Net proceeds from issuance of common stock	12,731	12,857	62,092
Tax benefit of stock-based compensation	28	2,714	1,326
Preferred stock	(8,041)	(8,352)
Common stock	(84,511)	(81,220)	(71,246)
Net cash flows provided by financing activities	1,120,912	1,364,849	233,263
Net Increase (Decrease) in Cash and Cash Equivalents	201,726	73,412	(25,063)
Cash and cash equivalents at beginning of year	287,393	213,981	239,044
Cash and Cash Equivalents at End of Year	489,119	287,393	213,981
Interest	47,805	43,057	46,337
Parent Company [Member]
Supplemental Cash Flow Information [Line Items]
Net income	159,649	144,050	117,804
Undistributed earnings from subsidiaries	(71,739)	(55,631)	(43,804)
Other, net	680	(637)	(6,218)
Net cash flows provided by operating activities	88,590	87,782	67,782
Proceeds from sale of securities available for sale		934	128
Net decrease in advances to subsidiaries	3,285	2,018	1,080
Net (increase) decrease in investment in subsidiaries	(9,060)	(2,877)	1,845
Net cash received (paid) in business combinations		5,594	(3,533)
Net cash flows used in investing activities	(5,775)	5,669	(480)
Net decrease in advance from affiliate	(2,797)	(1,908)	(854)
Net (decrease) increase in short-term borrowings	(135)	(88)	84
Decrease in long-term debt	(650)	(34,865)	(134,829)
Increase in long-term debt	98,794	821	499
Net proceeds from issuance of preferred stock			106,882
Net proceeds from issuance of common stock	12,731	12,857	62,092
Tax benefit of stock-based compensation	28	2,714	1,326
Preferred stock	(8,041)	(8,352)
Common stock	(84,511)	(81,220)	(71,246)
Net cash flows provided by financing activities	15,419	(110,041)	(36,046)
Net Increase (Decrease) in Cash and Cash Equivalents	98,234	(16,590)	31,256
Cash and cash equivalents at beginning of year	129,320	145,910	114,654
Cash and Cash Equivalents at End of Year	227,554	129,320	145,910
Interest	$ 8,309	$ 9,112	$ 14,351