F.N.B. (FNB) 10-Q 6 Nov 15 2015 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2015	Oct. 31, 2015
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2015
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	Q3
Trading Symbol	FNB
Entity Registrant Name	FNB CORP/FL/
Entity Central Index Key	37,808
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		175,377,201

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Assets
Cash and due from banks	$ 208,560	$ 196,240
Interest bearing deposits with banks	50,206	91,153
Cash and Cash Equivalents	258,766	287,393
Securities available for sale	1,578,526	1,534,065
Securities held to maturity (fair value of $1,546,135 and $1,468,258)	1,526,290	1,453,355
Residential mortgage loans held for sale	3,575	6,180
Loans and leases, net of unearned income of $48,830 and $56,131	11,873,645	11,247,038
Allowance for credit losses	(136,183)	(125,926)
Net Loans and Leases	11,737,462	11,121,112
Premises and equipment, net	161,689	168,756
Goodwill	834,141	832,213
Core deposit and other intangible assets, net	46,417	47,504
Bank owned life insurance	306,061	301,771
Other assets	383,146	374,741
Total Assets	16,836,073	16,127,090
Liabilities
Non-interest bearing demand	2,911,435	2,647,623
Interest bearing demand	5,558,322	4,547,628
Savings	1,736,350	1,575,922
Certificates and other time deposits	2,553,629	2,611,035
Total Deposits	12,759,736	11,382,208
Short-term borrowings	1,287,302	2,041,658
Long-term borrowings	542,653	541,443
Other liabilities	151,633	140,325
Total Liabilities	14,741,324	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 - 176,513,189 and 175,450,303 shares	1,766	1,754
Additional paid-in capital	1,805,926	1,798,984
Retained earnings	227,287	176,120
Accumulated other comprehensive loss	(34,397)	(46,003)
Treasury stock - 1,149,750 and 1,458,045 shares at cost	(12,715)	(16,281)
Total Stockholders' Equity	2,094,749	2,021,456
Total Liabilities and Stockholders' Equity	$ 16,836,073	$ 16,127,090

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Securities held to maturity, fair value	$ 1,546,135	$ 1,468,258
Unearned income on loans	$ 48,830	$ 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	176,513,189	175,450,303
Treasury stock, shares	1,149,750	1,458,045

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Interest Income
Loans and leases, including fees	$ 120,875	$ 116,468	$ 358,074	$ 330,107
Securities:
Taxable	14,576	13,693	43,257	39,557
Nontaxable	1,707	1,356	4,564	3,934
Dividends	9	26	29	218
Other	30	23	90	70
Total Interest Income	137,197	131,566	406,014	373,886
Interest Expense
Deposits	7,948	7,457	23,033	22,067
Short-term borrowings	1,786	1,459	5,348	4,011
Long-term borrowings	2,262	2,031	6,744	5,172
Total Interest Expense	11,996	10,947	35,125	31,250
Net Interest Income	125,201	120,619	370,889	342,636
Provision for credit losses	10,777	11,197	27,777	28,608
Net Interest Income After Provision for Credit Losses	114,424	109,422	343,112	314,028
Non-Interest Income
Service charges	18,628	17,742	51,959	50,452
Trust fees	5,210	4,868	15,803	14,494
Insurance commissions and fees	4,423	4,169	12,351	12,805
Securities commissions and fees	3,304	3,132	9,958	8,525
Net securities gains	314	1,178	319	11,415
Mortgage banking operations	2,424	1,078	6,739	2,220
Bank owned life insurance	1,846	1,828	5,527	5,820
Other	5,210	3,557	16,637	13,081
Total Non-Interest Income	41,359	37,552	119,293	118,812
Non-Interest Expense
Salaries and employee benefits	51,859	49,590	151,559	147,008
Net occupancy	7,957	7,734	25,405	24,284
Equipment	8,237	7,625	23,583	21,701
Amortization of intangibles	2,034	2,455	6,148	7,199
Outside services	7,314	8,183	25,254	23,653
FDIC insurance	3,158	3,206	9,630	9,599
Merger and acquisition related	1,312	1,904	1,683	8,054
Other	16,278	15,150	46,041	41,099
Total Non-Interest Expense	98,149	95,847	289,303	282,597
Income Before Income Taxes	57,634	51,127	173,102	150,243
Income taxes	17,581	15,736	52,575	45,497
Net Income	40,053	35,391	120,527	104,746
Less: Preferred stock dividends	2,010	2,010	6,030	6,342
Net Income Available to Common Stockholders	$ 38,043	$ 33,381	$ 114,497	$ 98,404
Net Income per Common Share - Basic	$ 0.22	$ 0.20	$ 0.65	$ 0.60
Net Income per Common Share - Diluted	0.22	0.20	0.65	0.59
Cash Dividends per Common Share	$ 0.12	$ 0.12	$ 0.36	$ 0.36
Comprehensive income	$ 49,609	$ 31,499	$ 132,133	$ 121,219

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity (Unaudited) - 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, 2013	$ 1,774,383	$ 106,882	$ 1,592	$ 1,608,117	$ 121,870	$ (56,924)	$ (7,154)
Comprehensive income	121,219				104,746	16,473
Dividends declared:
Preferred stock	(6,342)				(6,342)
Common stock: $0.36/share	(60,234)				(60,234)
Issuance of common stock	1,418		16	9,007	(228)		(7,377)
Issuance of common stock - acquisitions	170,163		139	170,024
Restricted stock compensation	2,328			2,328
Tax benefit of stock-based compensation	2,198			2,198
Balance at Sep. 30, 2014	2,005,133	106,882	1,747	1,791,674	159,812	(40,451)	(14,531)
Balance at Dec. 31, 2014	2,021,456	106,882	1,754	1,798,984	176,120	(46,003)	(16,281)
Comprehensive income	132,133				120,527	11,606
Dividends declared:
Preferred stock	(6,030)				(6,030)
Common stock: $0.36/share	(63,330)				(63,330)
Issuance of common stock	7,229		12	3,651			3,566
Restricted stock compensation	3,286			3,286
Tax benefit of stock-based compensation	5			5
Balance at Sep. 30, 2015	$ 2,094,749	$ 106,882	$ 1,766	$ 1,805,926	$ 227,287	$ (34,397)	$ (12,715)

Consolidated Statements of Sto6

Consolidated Statements of Stockholders' Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Stockholders' Equity [Abstract]
Common stock dividends per share	$ 0.12	$ 0.12	$ 0.36	$ 0.36

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Operating Activities
Net income	$ 120,527	$ 104,746
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation, amortization and accretion	31,412	29,007
Provision for credit losses	27,777	28,608
Deferred tax expense (benefit)	3,874	(2,533)
Net securities gains	(319)	(11,415)
Tax benefit of stock-based compensation	(5)	(2,198)
Loans originated for sale	(336,776)	(98,741)
Loans sold	346,174	105,169
Gain on sale of loans	(6,794)	(3,721)
Net change in:
Interest receivable	(4,457)	(1,590)
Interest payable	(414)	(1,058)
Securities classified as trading in business combination and sold		241,595
Bank owned life insurance	(4,266)	(5,205)
Other, net	8,144	(4,165)
Net cash flows provided by operating activities	184,877	378,499
Investing Activities
Net change in loans and leases	(657,586)	(888,443)
Securities available for sale:
Purchases	(279,636)	(686,108)
Sales	33,499	175,872
Maturities	212,140	245,942
Securities held to maturity:
Purchases	(279,998)	(436,519)
Sales		4,570
Maturities	203,689	153,624
Purchase of bank owned life insurance	(72,688)	(16)
Withdrawal/surrender of bank owned life insurance	72,664	18,715
Increase in premises and equipment	(7,304)	(12,580)
Net cash received in business combinations	148,159	60,035
Net cash flows used in investing activities	(627,061)	(1,364,908)
Financing Activities
Demand (non-interest bearing and interest bearing) and savings accounts	1,304,345	654,144
Time deposits	(78,764)	(224,733)
Short-term borrowings	(754,356)	348,827
Increase in long-term borrowings	20,976	376,418
Decrease in long-term borrowings	(19,804)	(87,677)
Net proceeds from issuance of common stock	10,515	7,795
Tax benefit of stock-based compensation	5	2,198
Cash dividends paid:
Preferred stock	(6,030)	(6,342)
Common stock	(63,330)	(60,234)
Net cash flows provided by financing activities	413,557	1,010,396
Net (Decrease) Increase in Cash and Cash Equivalents	(28,627)	23,987
Cash and cash equivalents at beginning of period	287,393	213,981
Cash and Cash Equivalents at End of Period	$ 258,766	$ 237,968

Business

Business	9 Months Ended
	Sep. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Business	BUSINESS F.N.B. Corporation (the Corporation), headquartered in Pittsburgh, Pennsylvania, is a diversified financial services company operating in six states and three major metropolitan areas, including Pittsburgh, Pennsylvania, Baltimore, Maryland and Cleveland, Ohio. As of September 30, 2015, the Corporation had 289 banking offices throughout Pennsylvania, Ohio, Maryland and West Virginia. The Corporation provides a full range of commercial banking, consumer banking and wealth management solutions through its subsidiary network which is led by its largest affiliate, First National Bank of Pennsylvania (FNBPA). Commercial banking solutions include corporate banking, small business banking, investment real estate financing, international banking, business credit, capital markets and lease financing. Consumer banking provides a full line of consumer banking products and services including deposit products, mortgage lending, consumer lending and a complete suite of mobile and online banking services. Wealth management services include asset management, private banking and insurance. The Corporation also operates Regency Finance Company (Regency), which had 73 consumer finance offices in Pennsylvania, Ohio, Kentucky and Tennessee as of September 30, 2015.

Basis of Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	BASIS OF PRESENTATION The Corporation’s accompanying consolidated financial statements and these notes to the financial statements include subsidiaries in which the Corporation has a controlling financial interest. The Corporation owns and operates FNBPA, First National Trust Company, First National Investment Services Company, LLC, F.N.B. Investment Advisors, Inc., First National Insurance Agency, LLC, Regency, 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). Certain information and note disclosures normally included in consolidated financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to the rules and regulations of the SEC. The interim operating results are not necessarily indicative of operating results the Corporation expects for the full year. These interim consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in the Corporation’s Annual Report on Form 10-K filed with the SEC on February 27, 2015.

Use of Estimates

Use of Estimates	9 Months Ended
	Sep. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Use of Estimates	USE OF ESTIMATES The accounting and reporting policies of the Corporation conform with GAAP. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual results could materially differ from those estimates. Material estimates that are particularly susceptible to significant changes include the allowance for credit losses, securities valuations, goodwill and other intangible assets and income taxes.

Debt Offering

Debt Offering	9 Months Ended
	Sep. 30, 2015
Text Block [Abstract]
Debt Offering	DEBT OFFERING On October 2, 2015, the Corporation completed its offering of $100,000 aggregate principal amount of 4.875% subordinated notes due in 2025. The subordinated notes will be treated as tier 2 capital for regulatory capital purposes. The net proceeds of the debt offering after deducting underwriting discounts and commissions and estimated offering expenses were $98,500. The Corporation intends to use the net proceeds from the sale of the subordinated notes for general corporate purposes, which may include investments at the holding company level, providing capital to support the growth of FNBPA and its business, repurchases of its common shares and the payment of the cash consideration components of future acquisitions.

Mergers and Acquisitions

Mergers and Acquisitions	9 Months Ended
	Sep. 30, 2015
Business Combinations [Abstract]
Mergers and Acquisitions	MERGERS AND ACQUISITIONS 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, in which the Corporation acquired approximately $154,619 in deposits. The assets and liabilities relating to the branches purchased were recorded on the Corporation’s consolidated balance sheet at their preliminary fair values as of September 18, 2015, and the related results of operations for these branches have been included in the Corporation’s consolidated statement of comprehensive income since that date. Based on the preliminary purchase price allocation, the Corporation recorded $2,539 in goodwill and $3,081 in core deposit intangibles. These fair value estimates are provisional amounts based on third party valuations that are currently under review. The goodwill for this transaction is expected to be deductible for income tax purposes. 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 $42,451 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. Pending Acquisition – Metro Bancorp, Inc. On August 4, 2015, the Corporation entered into a definitive merger agreement to acquire Metro Bancorp, Inc. (METR), a bank holding company based in Harrisburg, Pennsylvania with approximately $3,001,357 in total assets. The transaction is valued at approximately $474,000. Under the terms of the merger agreement, METR shareholders will be entitled to receive 2.373 shares of the Corporation’s common stock for each share of METR common stock. The Corporation expects to issue approximately 33.6 million shares of its common stock in exchange for approximately 14.1 million shares of METR common stock. METR’s banking affiliate, Metro Bank, will be merged into FNBPA. The transaction is expected to be completed in the first quarter of 2016, pending regulatory approvals, the approval of shareholders of the Corporation and METR, and the satisfaction of other closing conditions. 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, pending regulatory approval.

New Accounting Standards

New Accounting Standards	9 Months Ended
	Sep. 30, 2015
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
New Accounting Standards	NEW ACCOUNTING STANDARDS Business Combinations – Simplifying the Accounting for Measurement-Period Adjustments In September 2015, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2015-16, Business Combinations – Simplifying the Accounting for Measurement-Period Adjustments. Insurance – Disclosures about Short-Duration Contracts In May 2015, the FASB issued ASU 2015-09, Financial Services – Insurance. Cloud Computing Arrangements In April 2015, the FASB issued ASU 2015-05, Intangibles-Goodwill and Other-Internal-Use Software Interest – Imputation of Interest In April 2015, the FASB issued ASU 2015-03, Interest – Imputation of Interest. Consolidation In February 2015, the FASB issued ASU 2015-02, Consolidation Income Statement In January 2015, the FASB issued ASU 2015-01, Income Statement – Extraordinary and Unusual Items

Securities

Securities	9 Months Ended
	Sep. 30, 2015
Investments, Debt and Equity Securities [Abstract]
Securities	SECURITIES The amortized cost and fair value of securities are as follows: Amortized Cost Gross Gross Fair Value Securities Available for Sale September 30, 2015 U.S. Treasury $ 29,704 $ 300 $ — $ 30,004 U.S. government-sponsored entities 388,428 2,644 (305 ) 390,767 Residential mortgage-backed securities: Agency mortgage-backed securities 587,244 9,958 (82 ) 597,120 Agency collateralized mortgage obligations 529,656 3,220 (4,948 ) 527,928 Non-agency collateralized mortgage obligations 1,212 15 — 1,227 Commercial mortgage-backed securities 4,384 8 — 4,392 States of the U.S. and political subdivisions 10,927 345 — 11,272 Other debt securities 14,700 267 (414 ) 14,553 Total debt securities 1,566,255 16,757 (5,749 ) 1,577,263 Equity securities 975 288 — 1,263 $ 1,567,230 $ 17,045 $ (5,749 ) $ 1,578,526 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 Securities Held to Maturity September 30, 2015 U.S. Treasury $ 500 $ 169 $ — $ 669 U.S. government-sponsored entities 146,528 1,964 (79 ) 148,413 Residential mortgage-backed securities: Agency mortgage-backed securities 669,221 15,887 (16 ) 685,092 Agency collateralized mortgage obligations 462,191 3,556 (4,181 ) 461,566 Non-agency collateralized mortgage obligations 3,055 15 — 3,070 Commercial mortgage-backed securities 17,334 468 — 17,802 States of the U.S. and political subdivisions 227,461 2,888 (826 ) 229,523 $ 1,526,290 $ 24,947 $ (5,102 ) $ 1,546,135 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 The Corporation classifies securities as trading securities when management intends to sell such securities in the near term. Such securities are carried at fair value, with unrealized gains (losses) reflected through the consolidated statements of comprehensive income. The Corporation classified certain securities acquired in conjunction with its acquisitions as trading securities. The Corporation both acquired and sold these trading securities during the quarterly periods in which each of the acquisitions occurred. As of September 30, 2015 and December 31, 2014, the Corporation did not hold any trading securities. Gross gains and gross losses were realized on securities as follows: Three Months Ended Nine Months Ended September 30, September 30, 2015 2014 2015 2014 Gross gains $ 314 $ 1,191 $ 328 $ 19,939 Gross losses — (13 ) (9 ) (8,524 ) $ 314 $ 1,178 $ 319 $ 11,415 During the first quarter of 2014, the Corporation strategically sold its 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 (Dodd-Frank Act), and as such, was required to be disposed of by July 2016. Partially offsetting this gain was a net loss of $3,529 relating to the sale of other securities. By selling these securities, the Corporation strengthened the risk profile of its investment portfolio, improved its capital levels due to lowered risk-weighted assets and generated capital to support future growth. As of September 30, 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 $ 4,994 $ 5,027 $ 1,940 $ 1,951 Due from one to five years 423,858 426,751 139,429 140,465 Due from five to ten years 10,013 10,338 71,708 73,681 Due after ten years 4,894 4,480 161,412 162,508 443,759 446,596 374,489 378,605 Residential mortgage-backed securities: Agency mortgage-backed securities 587,244 597,120 669,221 685,092 Agency collateralized mortgage obligations 529,656 527,928 462,191 461,566 Non-agency collateralized mortgage obligations 1,212 1,227 3,055 3,070 Commercial mortgage-backed securities 4,384 4,392 17,334 17,802 Equity securities 975 1,263 — — $ 1,567,230 $ 1,578,526 $ 1,526,290 $ 1,546,135 Maturities may differ from contractual terms because borrowers may have the right to call or prepay obligations with or without penalties. Periodic payments are received on mortgage-backed securities based on the payment patterns of the underlying collateral. At September 30, 2015 and December 31, 2014, securities with a carrying value of $2,062,257 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 $258,428 and $892,647 at September 30, 2015 and December 31, 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 12 Months or More Total # Fair Value Unrealized # Fair Value Unrealized # Fair Value Unrealized Securities Available for Sale September 30, 2015 U.S. government-sponsored entities 3 $ 59,823 $ (177 ) 3 $ 37,867 $ (128 ) 6 $ 97,690 $ (305 ) Residential mortgage-backed securities: Agency mortgage-backed securities 1 18,591 (82 ) — — — 1 18,591 (82 ) Agency collateralized mortgage obligations 4 63,640 (123 ) 18 228,010 (4,825 ) 22 291,650 (4,948 ) Other debt securities — — — 3 4,480 (414 ) 3 4,480 (414 ) 8 $ 142,054 $ (382 ) 24 $ 270,357 $ (5,367 ) 32 $ 412,411 $ (5,749 ) 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 September 30, 2015 U.S. government-sponsored entities — $ — $ — 1 $ 14,921 $ (79 ) 1 $ 14,921 $ (79 ) Residential mortgage-backed securities: Agency mortgage-backed securities — — — 1 924 (16 ) 1 924 (16 ) Agency collateralized mortgage obligations 3 46,120 (212 ) 14 170,359 (3,969 ) 17 216,479 (4,181 ) States of the U.S. and political subdivisions 24 46,933 (826 ) — — — 24 46,933 (826 ) 27 $ 93,053 $ (1,038 ) 16 $ 186,204 $ (4,064 ) 43 $ 279,257 $ (5,102 ) 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 that the Corporation will be required to sell the securities before recovery of their amortized cost basis. The Corporation’s remaining 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 TPS had an amortized cost and estimated fair value of $4,894 and $4,480 at September 30, 2015, respectively. The Corporation has concluded from its analysis performed at September 30, 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 other-than-temporary impairment (OTTI) on a quarterly basis. Impairment is assessed at the individual security level. The Corporation considers an investment security impaired if the fair value of the security is less than its cost or amortized cost basis. The following table presents a summary of the cumulative credit-related OTTI charges recognized as components of earnings for securities for which a portion of an OTTI is recognized in other comprehensive income: Collateralized Debt Obligations Equities Total For the Nine Months Ended September 30, 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 Nine Months Ended September 30, 2014 Beginning balance $ 17,155 $ 27 $ 17,182 Loss where impairment was not previously recognized — — — Additional loss where impairment was previously recognized — — — Reduction due to credit impaired securities sold (17,155 ) — (17,155 ) Ending balance $ — $ 27 $ 27 The Corporation did not recognize any impairment losses on securities for the nine months ended September 30, 2015 or 2014. States of the U.S. and Political Subdivisions The Corporation’s municipal bond portfolio of $238,733 as of September 30, 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 93.6% 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 $1,492. In addition to the strong stand-alone ratings, 83.0% of the municipalities have some formal credit enhancement insurance that strengthens the creditworthiness of their issue. Management also reviews the credit profile of each issuer on a quarterly basis.

Federal Home Loan Bank Stock

Federal Home Loan Bank Stock	9 Months Ended
	Sep. 30, 2015
Banking and Thrift [Abstract]
Federal Home Loan Bank Stock	FEDERAL HOME LOAN BANK STOCK The Corporation is a member of the Federal Home Loan Bank (FHLB) of Pittsburgh. The FHLB requires members to purchase and hold a specified minimum level of FHLB stock based upon their level of borrowings, collateral balances and participation in other programs offered by the FHLB. Stock in the FHLB is non-marketable and is redeemable at the discretion of the FHLB. Both cash and stock dividends on FHLB stock are reported as income. Members do not purchase stock in the FHLB for the same reasons that traditional equity investors acquire stock in an investor-owned enterprise. Rather, members purchase stock to obtain access to the low-cost products and services offered by the FHLB. Unlike equity securities of traditional for-profit enterprises, the stock of FHLB does not provide its holders with an opportunity for capital appreciation because, by regulation, FHLB stock can only be purchased, redeemed and transferred at par value. At September 30, 2015 and December 31, 2014, the Corporation’s FHLB stock totaled $44,845 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	9 Months Ended
	Sep. 30, 2015
Receivables [Abstract]
Loans and Leases	LOANS AND LEASES Following is a summary of loans and leases, net of unearned income: Originated Loans Acquired Loans Total Loans and September 30, 2015 Commercial real estate $ 3,322,669 $ 626,577 $ 3,949,246 Commercial and industrial 2,410,186 81,169 2,491,355 Commercial leases 199,130 — 199,130 Total commercial loans and leases 5,931,985 707,746 6,639,731 Direct installment 1,643,345 49,293 1,692,638 Residential mortgages 1,013,254 373,132 1,386,386 Indirect installment 973,216 812 974,028 Consumer lines of credit 1,003,278 123,724 1,127,002 Other 53,860 — 53,860 $ 10,618,938 $ 1,254,707 $ 11,873,645 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 and lease 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 $181,298 or 1.5% of total loans and leases at September 30, 2015, compared to $180,588 or 1.6% of total loans and leases 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 September 30, 2015, 38.9% of the commercial real estate loans were owner-occupied, while the remaining 61.1% were non-owner-occupied, compared to 41.6% and 58.4%, respectively, as of December 31, 2014. As of September 30, 2015 and December 31, 2014, the Corporation had commercial construction loans of $294,249 and $296,156, respectively, representing 2.5% and 2.6% of total loans and leases at those respective dates. 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: September 30, 2015 December 31, Accounted for under ASC 310-30: Outstanding balance $ 1,345,685 $ 1,597,558 Carrying amount 1,094,604 1,344,171 Accounted for under ASC 310-20: Outstanding balance 159,695 242,488 Carrying amount 153,539 228,748 Total acquired loans: Outstanding balance 1,505,380 1,840,046 Carrying amount 1,248,143 1,572,919 The carrying amount of purchased credit impaired loans included in the table above totaled $8,766 at September 30, 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. Nine Months Ended September 30, 2015 2014 Balance at beginning of period $ 331,899 $ 305,646 Acquisitions — 71,111 Reduction due to unexpected early payoffs (35,601 ) (34,747 ) Reclass from non-accretable difference 24,489 9,925 Disposals/transfers (509 ) (5,390 ) Accretion (46,207 ) (54,664 ) Balance at end of period $ 274,071 $ 291,881 Credit Quality Management monitors the credit quality of the Corporation’s loan and lease portfolio on an ongoing basis. Measurement of delinquency and past due status is 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, or when the full amount of principal and interest due is not expected to be collected in full, unless the loan is both well secured and in the process of collection. Commercial loans are placed on non-accrual at 90 days, installment loans are placed on non-accrual at 120 days and residential mortgages and consumer lines of credit are generally placed on non-accrual at 180 days. When a loan is placed on non-accrual status, all unpaid interest is reversed. Non-accrual loans may not be restored to accrual status until all delinquent principal and interest have been paid and the ultimate ability to collect the remaining principal and interest is reasonably assured. TDRs are loans in which the borrower has been granted a concession on the interest rate or the original repayment terms due to financial distress. Following is a summary of non-performing assets: September 30, 2015 December 31, Non-accrual loans $ 47,298 $ 45,113 Troubled debt restructurings 21,221 23,439 Total non-performing loans 68,519 68,552 Other real estate owned (OREO) 38,931 41,466 Total non-performing assets $ 107,450 $ 110,018 Asset quality ratios: Non-performing loans as a percent of total loans and leases 0.58 % 0.61 % Non-performing loans + OREO as a percent of total loans and leases + OREO 0.90 % 0.97 % Non-performing assets as a percent of total assets 0.64 % 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 $4,285 at September 30, 2015. Also, the recorded investment of consumer mortgage loans secured by residential real estate properties for which formal foreclosure proceedings are in process at September 30, 2015 amounted to $12,786. The following tables provide an analysis of the aging of the Corporation’s past due loans by class, segregated by loans and leases originated and loans acquired: 30-89 Days Past Due > 90 Days Non-Accrual Total Current Total Loans and Originated Loans and Leases September 30, 2015 Commercial real estate $ 6,040 $ 3 $ 25,262 $ 31,305 $ 3,291,364 $ 3,322,669 Commercial and industrial 3,854 3 9,529 13,386 2,396,800 2,410,186 Commercial leases 709 14 835 1,558 197,572 199,130 Total commercial loans and leases 10,603 20 35,626 46,249 5,885,736 5,931,985 Direct installment 9,874 3,326 4,718 17,918 1,625,427 1,643,345 Residential mortgages 11,121 1,334 2,971 15,426 997,828 1,013,254 Indirect installment 8,213 522 1,133 9,868 963,348 973,216 Consumer lines of credit 3,385 629 988 5,002 998,276 1,003,278 Other 134 169 — 303 53,557 53,860 $ 43,330 $ 6,000 $ 45,436 $ 94,766 $ 10,524,172 $ 10,618,938 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 > 90 Days Non-Accrual Total Past Current Discount Total Loans Acquired Loans September 30, 2015 Commercial real estate $ 10,510 $ 11,108 $ 1,303 $ 22,921 $ 641,768 $ (38,112 ) $ 626,577 Commercial and industrial 686 527 107 1,320 87,163 (7,314 ) 81,169 Total commercial loans 11,196 11,635 1,410 24,241 728,931 (45,426 ) 707,746 Direct installment 670 834 — 1,504 46,981 808 49,293 Residential mortgages 8,607 15,261 — 23,868 386,425 (37,161 ) 373,132 Indirect installment 26 11 — 37 801 (26 ) 812 Consumer lines of credit 1,105 810 452 2,367 125,150 (3,793 ) 123,724 $ 21,604 $ 28,551 $ 1,862 $ 52,017 $ 1,288,288 $ (85,598 ) $ 1,254,707 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 acquired loans is based on the contractual balance outstanding at September 30, 2015 and December 31, 2014. (2) Acquired loans are considered performing upon acquisition, regardless of whether the customer is contractually delinquent, as long as 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 and performance of the borrower 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 and performance of the borrower has significantly deteriorated and 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 and lease 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 leases and conforms with regulatory categories. In general, loan and lease risk ratings within each category are reviewed on an ongoing basis according to the Corporation’s policy for each class of loans and leases. 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 and lease portfolio. Loans and leases within the Pass credit category or that migrate toward the Pass credit category generally have a lower risk of loss compared to loans and leases 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 and leases 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 September 30, 2015 Commercial real estate $ 3,195,455 $ 60,727 $ 65,568 $ 919 $ 3,322,669 Commercial and industrial 2,259,932 103,650 45,014 1,590 2,410,186 Commercial leases 194,783 3,149 1,198 — 199,130 $ 5,650,170 $ 167,526 $ 111,780 $ 2,509 $ 5,931,985 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 September 30, 2015 Commercial real estate $ 488,840 $ 49,669 $ 88,068 — $ 626,577 Commercial and industrial 69,036 1,969 10,164 — 81,169 $ 557,876 $ 51,638 $ 98,232 — $ 707,746 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 September 30, 2015 and December 31, 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 loans by payment status: Consumer Loan Credit Quality by Payment Status Performing Non-Performing Total September 30, 2015 Direct installment $ 1,630,566 $ 12,779 $ 1,643,345 Residential mortgages 1,000,774 12,480 1,013,254 Indirect installment 971,936 1,280 973,216 Consumer lines of credit 1,000,929 2,349 1,003,278 Other 53,860 — 53,860 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 and lease relationships less than $500 based on loan and lease 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 and leases, 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 Recorded Investment Specific Reserve Total Specific Average At or for the Nine Months Ended September 30, 2015 Commercial real estate $ 35,733 $ 25,035 $ 2,057 $ 27,092 $ 919 $ 26,928 Commercial and industrial 10,981 4,770 5,107 9,877 1,590 9,565 Commercial leases 835 835 — 835 — 767 Total commercial loans and leases 47,549 30,640 7,164 37,804 2,509 37,260 Direct installment 13,569 12,779 — 12,779 — 13,538 Residential mortgages 12,971 12,480 — 12,480 — 13,744 Indirect installment 3,220 1,280 — 1,280 — 1,168 Consumer lines of credit 2,565 2,349 — 2,349 — 2,134 $ 79,874 $ 59,528 $ 7,164 $ 66,692 $ 2,509 $ 67,844 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 $3,056; commercial and industrial of $579; direct installment of $1,427; residential mortgages of $558; indirect installment of $302; and consumer lines of credit of $642, totaling $6,564 at September 30, 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 payment status of originated TDRs: September 30, 2015 December 31, Accruing: Performing $ 14,692 $ 9,441 Non-performing 21,221 23,439 Non-accrual 7,800 8,272 $ 43,713 $ 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 the nine months ended September 30, 2015, the Corporation returned to performing status $7,577 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 $438 and $371 at September 30, 2015 and December 31, 2014, respectively, and pooled reserves for individual loans under $500 of $1,146 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 $3,350 and $3,448 at September 30, 2015 and December 31, 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 originated loans, by class, that have been restructured: Three Months Ended September 30, 2015 Nine Months Ended September 30, 2015 Number of Contracts Pre- Modification Post- Outstanding Recorded Investment Number Pre- Modification Recorded Investment Post- Commercial real estate — $ — $ — 2 $ 312 $ 168 Commercial and industrial — — — 1 5 4 Total commercial loans — — — 3 317 172 Direct installment 121 1,757 1,726 361 5,064 4,835 Residential mortgages 10 232 233 31 1,048 1,074 Indirect installment 3 13 10 13 43 40 Consumer lines of credit 10 146 143 40 666 610 144 $ 2,148 $ 2,112 448 $ 7,138 $ 6,731 Three Months Ended September 30, 2014 Nine Months Ended September 30, 2014 Number of Contracts Pre- Modification Post- Outstanding Recorded Investment Number Pre- Modification Recorded Investment Post- Commercial real estate 1 $ 50 $ 48 10 $ 2,633 $ 2,187 Commercial and industrial 2 126 119 3 323 307 Total commercial loans 3 176 167 13 2,956 2,494 Direct installment 116 1,323 1,240 378 4,922 4,693 Residential mortgages 9 480 470 33 1,847 1,784 Indirect installment 7 18 15 20 52 48 Consumer lines of credit 6 88 56 31 899 857 141 $ 2,085 $ 1,948 475 $ 10,676 $ 9,876 Following is a summary of originated TDRs, by class of loans and leases, for which there was a payment default, excluding loans that were either charged-off or cured by period end. Default occurs when a loan is 90 days or more past due and is within 12 months of restructuring. Three Months Ended Nine Months Ended Number of Contracts Recorded Number of Contracts Recorded Commercial real estate — $ — — $ — Commercial and industrial — — 1 204 Total commercial loans — — 1 204 Direct installment 22 87 75 254 Residential mortgages 2 75 5 179 Indirect installment 1 6 6 12 Consumer lines of credit — — 1 8 25 $ 168 88 $ 657 Three Months Ended Nine Months Ended Number of Contracts Recorded Number of Contracts Recorded Direct installment 41 $ 356 80 $ 732 Residential mortgages 2 33 2 33 Indirect installment 3 10 4 11 Consumer lines of credit 1 50 1 50 47 $ 449 87 $ 826 (1) The recorded investment is as of period end.

Allowance for Credit Losses

Allowance for Credit Losses	9 Months Ended
	Sep. 30, 2015
Receivables [Abstract]
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. 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 and leases are evaluated in the aggregate based on loan segment loss given default. Changes in the allowance for credit losses related to impaired loans and leases 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 and leases, as well as estimated probable credit losses inherent in the remainder of the portfolio. Adequacy of the allowance for credit losses is based on management’s evaluation of potential losses in the 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 portfolio, the estimated value of underlying collateral and residuals and changes in the composition of the 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 and leases, estimated losses on pools of homogeneous loans and leases 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. Following is a summary of changes in the allowance for credit losses, by loan and lease class: Balance at Beginning of Charge- Recoveries Net Provision Balance at Three Months Ended September 30, 2015 Commercial real estate $ 39,872 $ (1,259 ) $ 370 $ (889 ) $ 2,870 $ 41,853 Commercial and industrial 32,305 (584 ) 290 (294 ) 3,223 35,234 Commercial leases 2,223 (124 ) 50 (74 ) 265 2,414 Total commercial loans and leases 74,400 (1,967 ) 710 (1,257 ) 6,358 79,501 Direct installment 22,279 (2,722 ) 565 (2,157 ) 1,214 21,336 Residential mortgages 8,579 (268 ) 14 (254 ) 341 8,666 Indirect installment 8,909 (1,650 ) 264 (1,386 ) 2,090 9,613 Consumer lines of credit 9,118 (472 ) 56 (416 ) 871 9,573 Other 911 (402 ) 8 (394 ) 413 930 Total allowance on originated loans and leases 124,196 (7,481 ) 1,617 (5,864 ) 11,287 129,619 Purchased credit-impaired loans 658 — — — 36 695 Other acquired loans 6,287 (153 ) 282 129 (546 ) 5,869 Total allowance on acquired loans 6,945 (153 ) 282 129 (510 ) 6,564 Total allowance $ 131,141 $ (7,634 ) $ 1,899 $ (5,735 ) $ 10,777 $ 136,183 Nine Months Ended September 30, 2015 Commercial real estate $ 37,588 $ (3,237 ) $ 779 $ (2,458 ) $ 6,723 $ 41,853 Commercial and industrial 32,645 (2,684 ) 1,386 (1,298 ) 3,887 35,234 Commercial leases 2,398 (328 ) 95 (233 ) 249 2,414 Total commercial loans and leases 72,631 (6,249 ) 2,260 (3,989 ) 10,859 79,501 Direct installment 20,538 (8,108 ) 1,131 (6,977 ) 7,775 21,336 Residential mortgages 8,024 (891 ) 53 (838 ) 1,480 8,666 Indirect installment 7,504 (4,433 ) 898 (3,535 ) 5,644 9,613 Consumer lines of credit 8,496 (1,205 ) 132 (1,073 ) 2,150 9,573 Other 759 (1,062 ) 44 (1,018 ) 1,189 930 Total allowance on originated loans and leases 117,952 (21,948 ) 4,518 (17,430 ) 29,097 129,619 Purchased credit-impaired loans 660 (64 ) 19 (45 ) 80 695 Other acquired loans 7,314 (698 ) 653 (45 ) (1,400 ) 5,869 Total allowance on acquired loans 7,974 (762 ) 672 (90 ) (1,320 ) 6,564 Total allowance $ 125,926 $ (22,710 ) $ 5,190 $ (17,520 ) $ 27,777 $ 136,183 Three Months Ended September 30, 2014 Commercial real estate $ 38,478 $ (1,724 ) $ 506 $ (1,218 ) $ (80 ) $ 37,180 Commercial and industrial 33,017 (1,796 ) 192 (1,604 ) 2,883 34,296 Commercial leases 2,079 (167 ) 11 (156 ) 282 2,205 Total commercial loans and leases 73,574 (3,687 ) 709 (2,978 ) 3,085 73,681 Direct installment 16,844 (2,369 ) 271 (2,098 ) 4,814 19,560 Residential mortgages 5,506 (87 ) 13 (74 ) 1,218 6,650 Indirect installment 6,693 (898 ) 211 (687 ) 364 6,370 Consumer lines of credit 7,664 (360 ) 50 (310 ) 587 7,941 Other 907 (341 ) 9 (332 ) (208 ) 367 Total allowance on originated loans and leases 111,188 (7,742 ) 1,263 (6,479 ) 9,860 114,569 Purchased credit-impaired loans 448 (712 ) 1 (711 ) 1,026 763 Other acquired loans 5,112 (113 ) (41 ) (154 ) 311 5,269 Total allowance on acquired loans 5,560 (825 ) (40 ) (865 ) 1,337 6,032 Total allowance $ 116,748 $ (8,567 ) $ 1,223 $ (7,344 ) $ 11,197 $ 120,601 Nine Months Ended September 30, 2014 Commercial real estate $ 32,548 $ (5,519 ) $ 1,068 $ (4,451 ) $ 9,083 $ 37,180 Commercial and industrial 32,603 (2,849 ) 730 (2,119 ) 3,812 34,296 Commercial leases 1,903 (317 ) 93 (224 ) 526 2,205 Total commercial loans and leases 67,054 (8,685 ) 1,891 (6,794 ) 13,421 73,681 Direct installment 17,824 (7,154 ) 821 (6,333 ) 8,069 19,560 Residential mortgages 5,836 (356 ) 61 (295 ) 1,109 6,650 Indirect installment 6,409 (2,396 ) 658 (1,738 ) 1,699 6,370 Consumer lines of credit 7,231 (1,023 ) 143 (880 ) 1,590 7,941 Other 530 (910 ) 19 (891 ) 728 367 Total allowance on originated loans and leases 104,884 (20,524 ) 3,593 (16,931 ) 26,616 114,569 Purchased credit-impaired loans 1,000 (2,614 ) 1 (2,613 ) 2,376 763 Other acquired loans 4,900 (230 ) 983 753 (384 ) 5,269 Total allowance on acquired loans 5,900 (2,844 ) 984 (1,860 ) 1,992 6,032 Total allowance $ 110,784 $ (23,368 ) $ 4,577 $ (18,791 ) $ 28,608 $ 120,601 Following is a summary of the individual and collective originated allowance for credit losses and corresponding loan and lease balances by class: Allowance Loans and Leases Outstanding Individually Evaluated for Impairment Collectively Loans and Individually Collectively Evaluated for Impairment September 30, 2015 Commercial real estate $ 919 $ 40,934 $ 3,322,669 $ 14,182 $ 3,308,487 Commercial and industrial 1,590 33,644 2,410,186 6,186 2,404,000 Commercial leases — 2,414 199,130 — 199,130 Total commercial loans and leases 2,509 76,992 5,931,985 20,368 5,911,617 Direct installment — 21,336 1,643,345 — 1,643,345 Residential mortgages — 8,666 1,013,254 — 1,013,254 Indirect installment — 9,613 973,216 — 973,216 Consumer lines of credit — 9,573 1,003,278 — 1,003,278 Other — 930 53,860 — 53,860 $ 2,509 $ 127,110 $ 10,618,938 $ 20,368 $ 10,598,570 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

Borrowings

Borrowings	9 Months Ended
	Sep. 30, 2015
Debt Disclosure [Abstract]
Borrowings	BORROWINGS Following is a summary of short-term borrowings: September 30, 2015 December 31, Securities sold under repurchase agreements $ 256,320 $ 882,696 Federal Home Loan Bank advances 450,000 820,000 Federal funds purchased 456,000 210,000 Subordinated notes 124,982 128,962 $ 1,287,302 $ 2,041,658 Securities sold under repurchase agreements is comprised of customer repurchase agreements, which are sweep accounts with next day maturities utilized by larger commercial customers to earn interest on their funds. Securities are pledged to these customers in an amount equal to the outstanding balance. Following is a summary of long-term borrowings: September 30, 2015 December 31, Federal Home Loan Bank advances $ 400,017 $ 400,042 Subordinated notes 84,351 83,155 Junior subordinated debt 58,285 58,246 $ 542,653 $ 541,443 The Corporation’s banking affiliate has available credit with the FHLB of $4,467,170 of which $850,017 was used as of September 30, 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 both the nine months ended September 30, 2015 and the year ended December 31, 2014. The Corporation had two unconsolidated subsidiary trusts as of September 30, 2015 (collectively, the Trusts): F.N.B. Statutory Trust II and Omega Financial Capital Trust I. One hundred percent of the common equity of each Trust is owned by the Corporation. The Trusts were formed for the purpose of issuing Corporation-obligated mandatorily redeemable capital securities (TPS) to third-party investors. The proceeds from the sale of TPS and the issuance of common equity by the Trusts were invested in junior subordinated debt securities (subordinated debt) issued by the Corporation, which are the sole assets of each Trust. Since third-party investors are the primary beneficiaries, the Trusts are not consolidated in the Corporation’s financial statements. The Trusts pay dividends on the TPS at the same rate as the distributions paid by the Corporation on the junior subordinated debt held by the Trusts. Omega Financial Capital Trust I was assumed as a result of an acquisition. Distributions on the subordinated debt issued to the Trusts are recorded as interest expense by the Corporation. The TPS are subject to mandatory redemption, in whole or in part, upon repayment of the subordinated debt. The TPS are eligible for redemption, at any time, at the Corporation’s discretion. Under recently issued capital guidelines, effective January 1, 2015, the portion of the 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 September 30, 2015, with the remaining 75% moving to tier 2 capital. In 2016, the entire balance of the subordinated debt 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. The following table provides information relating to the Trusts as of September 30, 2015: Trust Preferred Securities Common Junior Subordinated Debt Stated Interest Rate F.N.B. Statutory Trust II $ 21,500 $ 665 $ 22,165 6/15/36 1.99 % Variable; 3-month LIBOR + 165 basis points (bps) Omega Financial Capital Trust I 36,000 1,114 36,120 10/18/34 2.48 % Variable; 3-month LIBOR + 219 bps $ 57,500 $ 1,779 $ 58,285

Derivative and Hedging Activiti

Derivative and Hedging Activities	9 Months Ended
	Sep. 30, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative and Hedging Activities	DERIVATIVE AND HEDGING ACTIVITIES 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: September 30, 2015 December 31, 2014 Notional Fair Value Notional Fair Value Amount Asset Liability Amount Asset Liability Gross Derivatives Subject to master netting arrangements: Interest rate contracts – designated $ 250,000 $ 4,918 $ 855 $ 200,000 $ 2,109 $ 2,330 Interest rate swaps – not designated 1,193,598 1 61,753 972,002 140 43,655 Equity contracts – not designated 1,180 12 — 1,210 47 — Total subject to master netting arrangements 1,444,778 4,931 62,608 1,173,212 2,296 45,985 Not subject to master netting arrangements: Interest rate swaps – not designated 1,193,598 61,348 1 972,002 43,602 128 Credit risk contracts – not designated 111,976 14 185 68,632 — — Equity contracts – not designated 1,180 — 12 1,210 — 47 Total not subject to master netting arrangements 1,306,754 61,362 198 1,041,844 43,602 175 $ 2,751,532 $ 66,293 $ 62,806 $ 2,215,056 $ 45,898 $ 46,160 Derivatives Designated as Hedging Instruments under GAAP Interest Rate Contracts. At September 30, 2015 and December 31, 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 $4,918 and $855, respectively, at September 30, 2015, and $2,109 and $2,330, respectively, at December 31, 2014. For the nine months ended September 30, 2015, the amount reclassified from accumulated other comprehensive income (AOCI) to interest income and interest expense totaled $2,440 ($1,586 net of tax) and $115 ($75 net of tax), respectively. As of September 30, 2015, the maximum length of time over which forecasted interest cash flows are hedged is eight years. In the twelve months that follow September 30, 2015, the Corporation expects to reclassify from the amount currently reported in AOCI net derivative gains of $2,219 ($1,443 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 September 30, 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 nine months ended September 30, 2015 and 2014, there was no hedge ineffectiveness. Also, during the nine months ended September 30, 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 $1,193,598 at September 30, 2015. Fair values included in other assets and other liabilities on the consolidated balance sheet applicable to these agreements amounted to $61,349 and $61,754, respectively, at September 30, 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 $74,010 as of September 30, 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 $185 at September 30, 2015 and $25 at December 31, 2014. The fair values of risk participation agreements purchased and sold were not material at September 30, 2015 and December 31, 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 $1,816 and $1,862 as of September 30, 2015 and December 31, 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 September 30, 2015 Derivative Assets Subject to master netting arrangements: Interest rate contracts Designated $ 4,918 — $ 4,918 Not designated 1 — 1 Equity contracts – not designated 12 — 12 Not subject to master netting arrangements: Interest rate contracts – not designated 61,348 — 61,348 Credit contracts – not designated 14 — 14 $ 66,293 — $ 66,293 Derivative Liabilities Subject to master netting arrangements: Interest rate contracts Designated $ 855 — $ 855 Not designated 61,753 — 61,753 Not subject to master netting arrangements: Interest rate contracts – not designated 1 — 1 Credit contracts – not designated 185 — 185 Equity contracts – not designated 12 — 12 $ 62,806 — $ 62,806 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: Net Amount Amount Not Offset in the Balance Sheet Financial Cash Net Amount September 30, 2015 Derivative Assets Interest rate contracts: Designated $ 4,918 $ 2,557 $ 2,361 — Not designated 1 1 — — Equity contracts – not designated 12 12 — — $ 4,931 $ 2,570 $ 2,361 — Derivative Liabilities Interest rate contracts: Designated $ 855 $ — $ — $ 855 Not designated 61,753 31,827 28,290 1,636 $ 62,608 $ 31,827 $ 28,290 $ 2,491 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 Nine Months Ended Statement September 30, Location 2015 2014 Interest Rate Contracts Interest income - loans and leases $ 2,440 $ 2,479 Interest Rate Contracts Interest expense – short-term borrowings 115 — Interest Rate Swaps Other income (364 ) (9 ) Credit Risk Contracts Other income (170 ) — 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 September 30, 2015 and December 31, 2014 are not material.

Commitments, Credit Risk and Co

Commitments, Credit Risk and Contingencies	9 Months Ended
	Sep. 30, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments, Credit Risk and Contingencies	COMMITMENTS, CREDIT RISK AND CONTINGENCIES The Corporation has commitments to extend credit and standby letters of credit that involve certain elements of credit risk in excess of the amount stated in the consolidated balance sheet. The Corporation’s exposure to credit loss in the event of non-performance by the customer is represented by the contractual amount of those instruments. The credit risk associated with loan commitments and standby letters of credit is essentially the same as that involved in extending loans and leases to customers and is subject to normal credit policies. Since many of these commitments expire without being drawn upon, the total commitment amounts do not necessarily represent future cash flow requirements. Following is a summary of off-balance sheet credit risk information: September 30, December 31, 2014 Commitments to extend credit $ 3,527,479 $ 3,665,481 Standby letters of credit 97,875 121,186 At September 30, 2015, funding of 75.3% 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 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, agent, 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	9 Months Ended
	Sep. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Incentive Plans	STOCK INCENTIVE PLANS Restricted Stock The Corporation issues restricted stock awards, consisting of both restricted stock and restricted stock units, to key employees under its Incentive Compensation Plans (Plans). 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. For the nine months ended September 30, 2015 and 2014, the Corporation issued 402,947 and 364,065 restricted stock awards, respectively, with aggregated grant date fair values of $5,302 and $4,954 under these plans. For performance-based restricted stock awards granted, the amount of shares recipients will earn is variable 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. As of September 30, 2015, the Corporation had available up to 2,072,110 shares of common stock to issue under the 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 $3,287 and $2,294 for the nine months ended September 30, 2015 and 2014, the tax benefit of which was $1,150 and $803, respectively. The following table summarizes certain information concerning restricted stock awards: Nine Months Ended September 30, 2015 2014 Awards Weighted Awards Weighted Unvested awards outstanding at beginning of period 1,354,093 $ 11.86 1,729,033 $ 10.23 Granted 402,947 13.16 364,065 13.61 Net adjustment due to performance 8,884 22.73 (87,512 ) 11.41 Vested (471,997 ) 10.66 (703,428 ) 8.79 Forfeited (29,428 ) 13.46 (50,849 ) 11.47 Dividend reinvestment 30,551 11.32 34,521 12.73 Unvested awards outstanding at end of period 1,295,050 12.73 1,285,830 11.90 The total fair value of awards vested was $5,912 and $10,670 for the nine months ended September 30, 2015 and 2014, respectively. As of September 30, 2015, there was $6,993 of unrecognized compensation cost related to unvested restricted stock awards, including $70 that is subject to accelerated vesting under the Plan’s immediate vesting upon retirement provision for awards granted prior to the adoption of ASC 718, Compensation – Stock Compensation Service- Awards Performance- Total Unvested awards 648,154 646,896 1,295,050 Unrecognized compensation expense $ 4,458 $ 2,535 $ 6,993 Intrinsic value $ 8,394 $ 8,377 $ 16,771 Weighted average remaining life (in years) 2.11 1.99 2.05 Stock Options All outstanding stock options were assumed in connection with certain of the Corporation’s completed acquisitions and are fully vested. Upon consummation of those 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 88,899 and 99,284 for the nine months ended September 30, 2015 and 2014, respectively. The following table summarizes certain information concerning stock option awards: Nine Months Ended September 30, 2015 2014 Shares Weighted Shares Weighted Options outstanding at beginning of period 568,834 $ 8.86 533,524 $ 11.50 Assumed from acquisitions — — 805,507 7.39 Exercised (88,899 ) 5.61 (140,817 ) 6.21 Forfeited (2,182 ) 4.34 (54,962 ) 24.41 Options outstanding and exercisable at end of period 477,753 9.48 1,143,252 8.64 The intrinsic value of outstanding and exercisable stock options at September 30, 2015 was $1,522. Warrants In conjunction with its participation in the U.S. Department of the Treasury’s (UST) Capital Purchase Program (CPP), the Corporation issued to the UST a warrant to purchase up to 1,302,083 shares of the Corporation’s common stock. Pursuant to Section 13(H) of the Warrant to Purchase Common Stock, the number of shares of common stock issuable upon exercise of the warrant was reduced in half to 651,042 shares on June 16, 2009, the date the Corporation completed a public offering. The warrant, which expires in 2019, was sold at auction by the UST and has an exercise price of $11.52 per share. In conjunction with the Parkvale Financial Corporation (Parkvale) acquisition on January 1, 2012, the warrant issued by Parkvale to the UST under the CPP has been converted into a warrant to purchase up to 819,640 shares of the Corporation’s common stock. This warrant, which was recorded at its fair value on January 1, 2012, 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 Annapolis Bancorp, Inc. (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 374,221, with a resulting lower exercise price of $3.27 per share as of September 30, 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	9 Months Ended
	Sep. 30, 2015
Compensation and Retirement Disclosure [Abstract]
Retirement Plans	RETIREMENT PLANS The Corporation sponsors the Retirement Income Plan (RIP), a qualified noncontributory defined benefit pension plan that covered substantially all salaried employees hired prior to January 1, 2008. The RIP covers employees who satisfied minimum age and length of service requirements. 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 is reduced by the monthly benefit the participant receives from Social Security, the RIP, the ERISA Excess Retirement Plan and the annuity equivalent of the automatic contributions to the qualified 401(k) defined contribution plan and the ERISA Excess Lost Match Plan. The BRP was frozen as of December 31, 2008. The ERISA Excess Retirement Plan was frozen as of December 31, 2010. The net periodic benefit credit for the defined benefit plans includes the following components: Three Months Ended Nine Months Ended September 30, September 30, 2015 2014 2015 2014 Service cost $ 18 $ 15 $ 52 $ 47 Interest cost 1,470 1,610 4,424 4,802 Expected return on plan assets (2,491 ) (2,486 ) (7,473 ) (7,460 ) Amortization: Unrecognized net transition asset — (6 ) — (16 ) Unrecognized prior service cost 2 2 6 6 Unrecognized loss 518 347 1,590 1,021 Net periodic pension credit $ (483 ) $ (518 ) $ (1,401 ) $ (1,600 ) 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 six percent that the employee defers. Additionally, the Corporation may provide a performance-based company contribution of up to three percent if the Corporation exceeds annual financial goals. Prior to January 1, 2015, the Corporation matched 100% of the first four percent that the employee deferred, provided an automatic contribution of three percent of compensation at the end of the year and could make an additional performance-based company contribution of up to two percent if the Corporation achieved its performance goals for the plan year. The Corporation’s contribution expense was $5,794 and $7,595 for the nine months ended September 30, 2015 and 2014, respectively. The Corporation also sponsors an ERISA Excess Lost Match Plan for certain officers. This plan provides retirement benefits equal to the difference, if any, between the maximum benefit allowable under the Internal Revenue Code and the amount that would have been provided under the qualified 401(k) defined contribution plan, if no limits were applied.

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2015
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES The Corporation bases its provision for income taxes upon income before income taxes, adjusted for the effect of certain tax-exempt income and non-deductible expenses. In addition, the Corporation reports certain items of income and expense in different periods for financial reporting and tax return purposes. The Corporation recognizes the tax effects of these temporary differences currently in the deferred income tax provision or benefit. The Corporation computes deferred tax assets or liabilities based upon the differences between the financial statement and income tax bases of assets and liabilities using the applicable marginal tax rate. The Corporation evaluates the probability that it will ultimately realize the full value of its deferred tax assets. Realization of the Corporation’s deferred tax assets is dependent upon a number of factors including the existence of any cumulative losses in prior periods, the amount of taxes paid in available carry-back periods, expectations for future earnings, applicable tax planning strategies and assessment of current and future economic and business conditions. The Corporation establishes a valuation allowance when it is “more likely than not” that the Corporation will not be able to realize a benefit from its deferred tax assets, or when future deductibility is uncertain. At September 30, 2015, the Corporation anticipates that it will not utilize some of its state net operating loss carryforwards and other net deferred tax assets at certain of its subsidiaries and has recorded a valuation allowance against these deferred tax assets. The Corporation believes that, except for the portion which is covered by a valuation allowance, it is more likely than not the Corporation will realize the benefits of its deferred tax assets, net of the valuation allowance, at September 30, 2015, based on the levels of projected taxable income of some of its entities.

Comprehensive Income

Comprehensive Income	9 Months Ended
	Sep. 30, 2015
Equity [Abstract]
Comprehensive Income	COMPREHENSIVE INCOME The components of comprehensive income, net of related tax, are as follows: Three Months Ended Nine Months Ended September 30, September 30, 2015 2014 2015 2014 Net income $ 40,053 $ 35,391 $ 120,527 $ 104,746 Other comprehensive income (loss): Securities available for sale: Unrealized gains (losses) arising during the period, net of tax expense (benefit) of $3,649, $(1,551), $4,302 and $10,399 6,777 (2,881 ) 7,989 19,312 Reclassification adjustment for gains included in net income, net of tax expense of $110, $412, $112 and $3,995 (204 ) (766 ) (207 ) (7,420 ) Derivative instruments: Unrealized gains arising during the period, net of tax expense of $1,709, $40, $2,353 and $2,979 3,174 74 4,370 5,532 Reclassification adjustment for gains included in net income, net of tax expense of $286, $293, $854 and $867 (531 ) (543 ) (1,586 ) (1,610 ) Pension and postretirement benefit obligations: Unrealized gains arising during the period, net of tax expense of $183, $121, $560 and $355 340 224 1,040 659 Other comprehensive income (loss) 9,556 (3,892 ) 11,606 16,473 Comprehensive income $ 49,609 $ 31,499 $ 132,133 $ 121,219 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. The following table presents changes in AOCI, net of tax, by component: Unrealized Net Gains (Losses) on Securities Available for Sale Unrealized Net Gains Derivative Instruments Unrecognized Postretirement Obligations Total Nine Months Ended September 30, 2015 Balance at beginning of period $ (440 ) $ (143 ) $ (45,420 ) $ (46,003 ) Other comprehensive income before reclassifications 7,989 4,370 1,040 13,399 Amounts reclassified from AOCI (207 ) (1,586 ) — (1,793 ) Net current period other comprehensive income 7,782 2,784 1,040 11,606 Balance at end of period $ 7,342 $ 2,641 $ (44,380 ) $ (34,397 )

Earnings Per Common Share

Earnings Per Common Share	9 Months Ended
	Sep. 30, 2015
Earnings Per Share [Abstract]
Earnings Per Common Share	EARNINGS PER COMMON SHARE Basic earnings per common share is calculated by dividing net income available to common stockholders by the weighted average number of shares of common stock outstanding net of unvested shares of restricted stock. Diluted earnings per common share is calculated by dividing net income available to common stockholders by the weighted average number of shares of common stock outstanding, adjusted for the dilutive effect of potential common shares issuable for stock options, warrants and restricted shares, as calculated using the treasury stock method. Adjustments to the weighted average number of shares of common stock outstanding are made only when such adjustments dilute earnings per common share. The following table sets forth the computation of basic and diluted earnings per common share: Three Months Ended Nine Months Ended September 30, September 30, 2015 2014 2015 2014 Net income $ 40,053 $ 35,391 $ 120,527 $ 104,746 Less: Preferred stock dividends 2,010 2,010 6,030 6,342 Net income available to common stockholders $ 38,043 $ 33,381 $ 114,497 $ 98,404 Basic weighted average common shares outstanding 175,343,789 167,260,386 174,816,692 165,229,206 Net effect of dilutive stock options, warrants, restricted stock and convertible debt 1,169,043 1,623,741 1,383,450 1,695,637 Diluted weighted average common shares outstanding 176,512,832 168,884,127 176,200,142 166,924,843 Earnings per common share: Basic $ 0.22 $ 0.20 $ 0.65 $ 0.60 Diluted $ 0.22 $ 0.20 $ 0.65 $ 0.59 For the three months ended September 30, 2015 and 2014, 19,385 and 32,419 shares of common stock, respectively, related to stock options and warrants were excluded from the computation of diluted earnings per common share because the exercise price of the shares was greater than the average market price of the common shares and, therefore, the effect would be anti-dilutive. For the nine months ended September 30, 2015 and 2014, 20,440 and 38,151 shares of common stock, respectively, related to stock options and warrants were excluded from the computation of diluted earnings per common share because the exercise price of the shares was greater than the average market price of the common shares and, therefore, the effect would be anti-dilutive.

Cash Flow Information

Cash Flow Information	9 Months Ended
	Sep. 30, 2015
Supplemental Cash Flow Elements [Abstract]
Cash Flow Information	CASH FLOW INFORMATION Following is a summary of supplemental cash flow information: Nine Months Ended September 30 2015 2014 Interest paid on deposits and other borrowings $ 35,531 $ 31,804 Income taxes paid 41,000 17,000 Transfers of loans to other real estate owned 6,901 7,784 Financing of other real estate owned sold 372 287

Business Segments

Business Segments	9 Months Ended
	Sep. 30, 2015
Segment Reporting [Abstract]
Business Segments	BUSINESS SEGMENTS The Corporation operates in four reportable segments: Community Banking, Wealth Management, Insurance and Consumer Finance. • The Community Banking segment provides commercial and consumer banking services. Commercial banking solutions include corporate banking, small business banking, investment real estate financing, international banking, business credit, capital markets and lease financing. Consumer banking products and services include deposit products, mortgage lending, consumer lending and a complete suite of mobile and online banking services. • The Wealth Management segment provides a broad range of personal and corporate fiduciary services including the administration of decedent and trust estates. In addition, it offers various alternative products, including securities brokerage and investment advisory services, mutual funds and annuities. • The Insurance segment includes a full-service insurance agency offering all lines of commercial and personal insurance through major carriers. The Insurance segment also includes a reinsurer. • The Consumer Finance segment primarily makes installment loans to individuals and purchases installment sales finance contracts from retail merchants. The Consumer Finance segment activity is funded through the sale of the Corporation’s subordinated notes at the finance company’s branch offices. The following tables provide financial information for these segments of the Corporation. The information provided under the caption “Parent and Other” represents operations not considered to be reportable segments and/or general operating expenses of the Corporation, and includes the parent company, other non-bank subsidiaries and eliminations and adjustments which are necessary for purposes of reconciliation to the consolidated amounts. Community Wealth Insurance Consumer Parent and Consolidated At or for the Three Months Ended September 30, 2015 Interest income $ 125,281 $ — $ 22 $ 10,096 $ 1,798 $ 137,197 Interest expense 10,473 — — 878 645 11,996 Net interest income 114,808 — 22 9,218 1,153 125,201 Provision for credit losses 8,702 — — 1,750 325 10,777 Non-interest income 29,667 8,682 3,602 716 (1,308 ) 41,359 Non-interest expense 80,906 6,703 3,201 4,983 322 96,115 Intangible amortization 1,824 69 141 — — 2,034 Income tax expense (benefit) 15,804 696 105 1,473 (497 ) 17,581 Net income (loss) 37,239 1,214 177 1,728 (305 ) 40,053 Total assets 16,658,489 21,099 22,201 187,721 (53,437 ) 16,836,073 Total intangibles 855,164 10,516 13,069 1,809 — 880,558 At or for the Three Months Ended September 30, 2014 Interest income $ 120,122 $ — $ 24 $ 9,773 $ 1,647 $ 131,566 Interest expense 9,435 — — 826 686 10,947 Net interest income 110,687 — 24 8,947 961 120,619 Provision for credit losses 9,427 — — 1,519 251 11,197 Non-interest income 27,179 8,174 3,373 719 (1,893 ) 37,552 Non-interest expense 79,243 6,294 2,943 4,983 (71 ) 93,392 Intangible amortization 2,282 72 101 — — 2,455 Income tax expense (benefit) 14,347 656 128 1,216 (611 ) 15,736 Net income (loss) 32,567 1,152 225 1,948 (501 ) 35,391 Total assets 15,584,832 21,892 19,148 182,301 (51,128 ) 15,757,045 Total intangibles 856,464 10,792 10,223 1,809 — 879,288 At or for the Nine Months Ended September 30, 2015 Interest income $ 371,366 $ — $ 67 $ 29,467 $ 5,114 $ 406,014 Interest expense 30,580 — — 2,593 1,952 35,125 Net interest income 340,786 — 67 26,874 3,162 370,889 Provision for credit losses 21,974 — — 5,288 515 27,777 Non-interest income 85,281 26,268 9,948 2,124 (4,328 ) 119,293 Non-interest expense 236,324 20,127 10,952 14,785 967 283,155 Intangible amortization 5,601 205 342 — — 6,148 Income tax expense (benefit) 48,744 2,143 (433 ) 3,660 (1,539 ) 52,575 Net income (loss) 113,424 3,793 (846 ) 5,265 (1,109 ) 120,527 Total assets 16,658,489 21,099 22,201 187,721 (53,437 ) 16,836,073 Total intangibles 855,164 10,516 13,069 1,809 — 880,558 At or for the Nine Months Ended September 30, 2014 Interest income $ 339,974 $ — $ 74 $ 28,716 $ 5,122 $ 373,886 Interest expense 26,413 — — 2,481 2,356 31,250 Net interest income 313,561 — 74 26,235 2,766 342,636 Provision for credit losses 23,148 — — 4,754 706 28,608 Non-interest income 86,512 23,530 10,582 2,120 (3,932 ) 118,812 Non-interest expense 231,390 19,038 8,900 14,800 1,270 275,398 Intangible amortization 6,680 216 303 — — 7,199 Income tax expense (benefit) 41,738 1,555 521 3,386 (1,703 ) 45,497 Net income (loss) 97,117 2,721 932 5,415 (1,439 ) 104,746 Total assets 15,584,832 21,892 19,148 182,301 (51,128 ) 15,757,045 Total intangibles 856,454 10,792 10,223 1,809 — 879,288

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2015
Fair Value Disclosures [Abstract]
Fair Value Measurements	FAIR VALUE MEASUREMENTS The Corporation uses fair value measurements to record fair value adjustments to certain financial assets and liabilities and to determine fair value disclosures. Securities available for sale and derivatives are recorded at fair value on a recurring basis. Additionally, from time to time, the Corporation may be required to record at fair value other assets on a non-recurring basis, such as mortgage loans held for sale, certain impaired loans, OREO and certain other assets. Fair value is defined as an exit price, representing the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Fair value measurements are not adjusted for transaction costs. Fair value is a market-based measure considered from the perspective of a market participant who holds the asset or owes the liability rather than an entity-specific measure. In determining fair value, the Corporation uses various valuation approaches, including market, income and cost approaches. ASC 820, Fair Value Measurements and Disclosures, establishes a hierarchy for inputs used in measuring fair value that maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that observable inputs be used when available. Observable inputs are inputs that market participants would use in pricing the asset or liability, which are developed based on market data obtained from sources independent of the Corporation. Unobservable inputs reflect the Corporation’s assumptions about the assumptions that market participants would use in pricing an asset or liability, which are developed based on the best information available in the circumstances. The fair value hierarchy gives the highest priority to unadjusted quoted market prices in active markets for identical assets or liabilities (Level 1 measurement) and the lowest priority to unobservable inputs (Level 3 measurement). The fair value hierarchy is broken down into three levels based on the reliability of inputs as follows: Measurement Definition Level 1 valuation is based upon unadjusted quoted market prices for identical instruments traded in active markets. Level 2 valuation is based upon quoted market prices for similar instruments traded in active markets, quoted market prices for identical or similar instruments traded in markets that are not active and model-based valuation techniques for which all significant assumptions are observable in the market or can be corroborated by market data. Level 3 valuation is derived from other valuation methodologies including discounted cash flow models and similar techniques that use significant assumptions not observable in the market. These unobservable assumptions reflect estimates of assumptions that market participants would use in determining fair value. A financial instrument’s level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement. Following is a description of the valuation methodologies the Corporation uses for financial instruments recorded at fair value on either a recurring or non-recurring basis: Securities Available For Sale Securities available for sale consists of both debt and equity securities. These securities are recorded at fair value on a recurring basis. At September 30, 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 was 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 September 30, 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 September 30, 2015 Assets Measured at Fair Value Available for sale debt securities: U.S. Treasury $ — $ 30,004 $ — $ 30,004 U.S. government-sponsored entities — 390,767 — 390,767 Residential mortgage-backed securities: Agency mortgage-backed securities — 597,120 — 597,120 Agency collateralized mortgage obligations — 527,928 — 527,928 Non-agency collateralized mortgage obligations — 7 1,220 1,227 Commercial mortgage-backed securities — 4,392 — 4,392 States of the U.S. and political subdivisions — 11,272 — 11,272 Other debt securities — 14,553 — 14,553 — 1,576,043 1,220 1,577,263 Available for sale equity securities: Financial services industry 95 656 383 1,134 Insurance services industry 129 — — 129 224 656 383 1,263 224 1,576,699 1,603 1,578,526 Derivative financial instruments: Trading — 61,361 — 61,361 Not for trading — 4,932 — 4,932 — 66,293 — 66,293 $ 224 $ 1,642,992 $ 1,603 $ 1,644,819 Liabilities Measured at Fair Value Derivative financial instruments: Trading — $ 61,766 — $ 61,766 Not for trading — 1,040 — 1,040 — $ 62,806 — $ 62,806 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 Nine Months Ended September 30, 2015 Balance at beginning of period — $ 475 $ 1,420 $ 1,895 Total gains (losses) – realized/unrealized: Included in earnings — — — — Included in other comprehensive income — (36 ) (3 ) (39 ) Accretion included in earnings — — 4 4 Purchases, issuances, sales and settlements: Purchases — — — — Issuances — — — — Sales/redemptions — — — — Settlements — — (201 ) (201 ) Transfers from Level 3 — (56 ) — (56 ) Transfers into Level 3 — — — — Balance at end of period — $ 383 $ 1,220 $ 1,603 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 footnote in this section of this Report for information relating to determining Level 3 fair values. During the second quarter of 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 nine months ended September 30, 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 (losses) gains included in earnings are in the net securities (losses) gains line item in the Consolidated Statements of Comprehensive Income. In accordance with GAAP, from time to time, the Corporation measures certain assets at fair value on a non-recurring basis. These adjustments to fair value usually result from the application of the lower of cost or fair value accounting or write-downs of individual assets. Valuation methodologies used to measure these fair value adjustments were previously described. For assets measured at fair value on a non-recurring basis still held at the balance sheet date, the following table provides the hierarchy level and the fair value of the related assets or portfolios: Level 1 Level 2 Level 3 Total September 30, 2015 Impaired loans — $ 1,016 $ 1,919 $ 2,935 Other real estate owned — 5,223 2,099 7,322 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 nine months or twelve months ended September 30, 2015 and December 31, 2014, respectively. 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 the nine months ended September 30, 2015 had a carrying amount of $5,227 and an allocated allowance for credit losses of $2,508. The allocated allowance is based on fair value of $2,935 less estimated costs to sell of $216. The allowance for credit losses includes a provision applicable to the current period fair value measurements of $1,329, which was included in the provision for credit losses for the nine months ended September 30, 2015. OREO with a carrying amount of $9,320 was written down to $6,476 (fair value of $7,322 less estimated costs to sell of $846), resulting in a loss of $2,844, which was included in earnings for the nine months ended September 30, 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 and Leases. 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 September 30, 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: Carrying Fair Value Measurements Amount Fair Value Level 1 Level 2 Level 3 September 30, 2015 Financial Assets Cash and cash equivalents $ 258,766 $ 258,766 $ 258,766 $ — $ — Securities available for sale 1,578,526 1,578,526 224 1,576,699 1,603 Securities held to maturity 1,526,290 1,546,135 — 1,543,065 3,070 Net loans and leases, including loans held for sale 11,741,037 11,633,933 — — 11,633,933 Derivative assets 66,293 66,293 — 66,293 — Accrued interest receivable 44,688 44,688 44,688 — — Financial Liabilities Deposits 12,759,736 12,762,839 10,206,107 2,556,732 — Short-term borrowings 1,287,302 1,287,302 1,287,302 — — Long-term borrowings 542,653 541,120 — — 541,120 Derivative liabilities 62,806 62,806 — 62,806 — Accrued interest payable 6,283 6,283 6,283 — — 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 and leases, 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 — —

New Accounting Standards (Polic

New Accounting Standards (Policies)	9 Months Ended
	Sep. 30, 2015
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Business Combinations - Simplifying the Accounting for Measurement-Period Adjustments	Business Combinations – Simplifying the Accounting for Measurement-Period Adjustments In September 2015, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2015-16, Business Combinations – Simplifying the Accounting for Measurement-Period Adjustments.
Insurance - Disclosures about Short-Duration Contracts	Insurance – Disclosures about Short-Duration Contracts In May 2015, the FASB issued ASU 2015-09, Financial Services – Insurance.
Cloud Computing Arrangements	Cloud Computing Arrangements In April 2015, the FASB issued ASU 2015-05, Intangibles-Goodwill and Other-Internal-Use Software
Interest - Imputation of Interest	Interest – Imputation of Interest In April 2015, the FASB issued ASU 2015-03, Interest – Imputation of Interest.
Consolidation	Consolidation In February 2015, the FASB issued ASU 2015-02, Consolidation
Income Statement	Income Statement In January 2015, the FASB issued ASU 2015-01, Income Statement – Extraordinary and Unusual Items

Securities (Tables)

Securities (Tables)	9 Months Ended
	Sep. 30, 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 Value Securities Available for Sale September 30, 2015 U.S. Treasury $ 29,704 $ 300 $ — $ 30,004 U.S. government-sponsored entities 388,428 2,644 (305 ) 390,767 Residential mortgage-backed securities: Agency mortgage-backed securities 587,244 9,958 (82 ) 597,120 Agency collateralized mortgage obligations 529,656 3,220 (4,948 ) 527,928 Non-agency collateralized mortgage obligations 1,212 15 — 1,227 Commercial mortgage-backed securities 4,384 8 — 4,392 States of the U.S. and political subdivisions 10,927 345 — 11,272 Other debt securities 14,700 267 (414 ) 14,553 Total debt securities 1,566,255 16,757 (5,749 ) 1,577,263 Equity securities 975 288 — 1,263 $ 1,567,230 $ 17,045 $ (5,749 ) $ 1,578,526 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
Schedule of Amortized Cost and Fair Value of Securities Held to Maturity	Amortized Gross Gross Fair Value Securities Held to Maturity September 30, 2015 U.S. Treasury $ 500 $ 169 $ — $ 669 U.S. government-sponsored entities 146,528 1,964 (79 ) 148,413 Residential mortgage-backed securities: Agency mortgage-backed securities 669,221 15,887 (16 ) 685,092 Agency collateralized mortgage obligations 462,191 3,556 (4,181 ) 461,566 Non-agency collateralized mortgage obligations 3,055 15 — 3,070 Commercial mortgage-backed securities 17,334 468 — 17,802 States of the U.S. and political subdivisions 227,461 2,888 (826 ) 229,523 $ 1,526,290 $ 24,947 $ (5,102 ) $ 1,546,135 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
Gross Gains and Gross Losses Realized on Sales of Securities	Gross gains and gross losses were realized on securities as follows: Three Months Ended Nine Months Ended September 30, September 30, 2015 2014 2015 2014 Gross gains $ 314 $ 1,191 $ 328 $ 19,939 Gross losses — (13 ) (9 ) (8,524 ) $ 314 $ 1,178 $ 319 $ 11,415
Amortized Cost and Fair Value of Securities, by Contractual Maturities	As of September 30, 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 $ 4,994 $ 5,027 $ 1,940 $ 1,951 Due from one to five years 423,858 426,751 139,429 140,465 Due from five to ten years 10,013 10,338 71,708 73,681 Due after ten years 4,894 4,480 161,412 162,508 443,759 446,596 374,489 378,605 Residential mortgage-backed securities: Agency mortgage-backed securities 587,244 597,120 669,221 685,092 Agency collateralized mortgage obligations 529,656 527,928 462,191 461,566 Non-agency collateralized mortgage obligations 1,212 1,227 3,055 3,070 Commercial mortgage-backed securities 4,384 4,392 17,334 17,802 Equity securities 975 1,263 — — $ 1,567,230 $ 1,578,526 $ 1,526,290 $ 1,546,135
Summaries of Fair Values and Unrealized Losses of Securities, Segregated by Length of Impairment	Following are summaries of the fair values and unrealized losses of securities, segregated by length of impairment: Less than 12 Months 12 Months or More Total # Fair Value Unrealized # Fair Value Unrealized # Fair Value Unrealized Securities Available for Sale September 30, 2015 U.S. government-sponsored entities 3 $ 59,823 $ (177 ) 3 $ 37,867 $ (128 ) 6 $ 97,690 $ (305 ) Residential mortgage-backed securities: Agency mortgage-backed securities 1 18,591 (82 ) — — — 1 18,591 (82 ) Agency collateralized mortgage obligations 4 63,640 (123 ) 18 228,010 (4,825 ) 22 291,650 (4,948 ) Other debt securities — — — 3 4,480 (414 ) 3 4,480 (414 ) 8 $ 142,054 $ (382 ) 24 $ 270,357 $ (5,367 ) 32 $ 412,411 $ (5,749 ) 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 September 30, 2015 U.S. government-sponsored entities — $ — $ — 1 $ 14,921 $ (79 ) 1 $ 14,921 $ (79 ) Residential mortgage-backed securities: Agency mortgage-backed securities — — — 1 924 (16 ) 1 924 (16 ) Agency collateralized mortgage obligations 3 46,120 (212 ) 14 170,359 (3,969 ) 17 216,479 (4,181 ) States of the U.S. and political subdivisions 24 46,933 (826 ) — — — 24 46,933 (826 ) 27 $ 93,053 $ (1,038 ) 16 $ 186,204 $ (4,064 ) 43 $ 279,257 $ (5,102 ) 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 Nine Months Ended September 30, 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 Nine Months Ended September 30, 2014 Beginning balance $ 17,155 $ 27 $ 17,182 Loss where impairment was not previously recognized — — — Additional loss where impairment was previously recognized — — — Reduction due to credit impaired securities sold (17,155 ) — (17,155 ) Ending balance $ — $ 27 $ 27

Loans and Leases (Tables)

Loans and Leases (Tables)	9 Months Ended
	Sep. 30, 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 Acquired Loans Total Loans and September 30, 2015 Commercial real estate $ 3,322,669 $ 626,577 $ 3,949,246 Commercial and industrial 2,410,186 81,169 2,491,355 Commercial leases 199,130 — 199,130 Total commercial loans and leases 5,931,985 707,746 6,639,731 Direct installment 1,643,345 49,293 1,692,638 Residential mortgages 1,013,254 373,132 1,386,386 Indirect installment 973,216 812 974,028 Consumer lines of credit 1,003,278 123,724 1,127,002 Other 53,860 — 53,860 $ 10,618,938 $ 1,254,707 $ 11,873,645 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 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: September 30, 2015 December 31, Accounted for under ASC 310-30: Outstanding balance $ 1,345,685 $ 1,597,558 Carrying amount 1,094,604 1,344,171 Accounted for under ASC 310-20: Outstanding balance 159,695 242,488 Carrying amount 153,539 228,748 Total acquired loans: Outstanding balance 1,505,380 1,840,046 Carrying amount 1,248,143 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. Nine Months Ended September 30, 2015 2014 Balance at beginning of period $ 331,899 $ 305,646 Acquisitions — 71,111 Reduction due to unexpected early payoffs (35,601 ) (34,747 ) Reclass from non-accretable difference 24,489 9,925 Disposals/transfers (509 ) (5,390 ) Accretion (46,207 ) (54,664 ) Balance at end of period $ 274,071 $ 291,881
Summary of Non-Performing Assets	Following is a summary of non-performing assets: September 30, 2015 December 31, Non-accrual loans $ 47,298 $ 45,113 Troubled debt restructurings 21,221 23,439 Total non-performing loans 68,519 68,552 Other real estate owned (OREO) 38,931 41,466 Total non-performing assets $ 107,450 $ 110,018 Asset quality ratios: Non-performing loans as a percent of total loans and leases 0.58 % 0.61 % Non-performing loans + OREO as a percent of total loans and leases + OREO 0.90 % 0.97 % Non-performing assets as a percent of total assets 0.64 % 0.68 %
Age Analysis of Past Due Loans, by Class	The following tables provide an analysis of the aging of the Corporation’s past due loans by class, segregated by loans and leases originated and loans acquired: 30-89 Days Past Due > 90 Days Non-Accrual Total Current Total Loans and Originated Loans and Leases September 30, 2015 Commercial real estate $ 6,040 $ 3 $ 25,262 $ 31,305 $ 3,291,364 $ 3,322,669 Commercial and industrial 3,854 3 9,529 13,386 2,396,800 2,410,186 Commercial leases 709 14 835 1,558 197,572 199,130 Total commercial loans and leases 10,603 20 35,626 46,249 5,885,736 5,931,985 Direct installment 9,874 3,326 4,718 17,918 1,625,427 1,643,345 Residential mortgages 11,121 1,334 2,971 15,426 997,828 1,013,254 Indirect installment 8,213 522 1,133 9,868 963,348 973,216 Consumer lines of credit 3,385 629 988 5,002 998,276 1,003,278 Other 134 169 — 303 53,557 53,860 $ 43,330 $ 6,000 $ 45,436 $ 94,766 $ 10,524,172 $ 10,618,938 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 > 90 Days Non-Accrual Total Past Current Discount Total Loans Acquired Loans September 30, 2015 Commercial real estate $ 10,510 $ 11,108 $ 1,303 $ 22,921 $ 641,768 $ (38,112 ) $ 626,577 Commercial and industrial 686 527 107 1,320 87,163 (7,314 ) 81,169 Total commercial loans 11,196 11,635 1,410 24,241 728,931 (45,426 ) 707,746 Direct installment 670 834 — 1,504 46,981 808 49,293 Residential mortgages 8,607 15,261 — 23,868 386,425 (37,161 ) 373,132 Indirect installment 26 11 — 37 801 (26 ) 812 Consumer lines of credit 1,105 810 452 2,367 125,150 (3,793 ) 123,724 $ 21,604 $ 28,551 $ 1,862 $ 52,017 $ 1,288,288 $ (85,598 ) $ 1,254,707 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 acquired loans is based on the contractual balance outstanding at September 30, 2015 and December 31, 2014. (2) Acquired loans are considered performing upon acquisition, regardless of whether the customer is contractually delinquent, as long as 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 and Leases by Credit Quality	The following tables present a summary of the Corporation’s commercial loans and leases 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 September 30, 2015 Commercial real estate $ 3,195,455 $ 60,727 $ 65,568 $ 919 $ 3,322,669 Commercial and industrial 2,259,932 103,650 45,014 1,590 2,410,186 Commercial leases 194,783 3,149 1,198 — 199,130 $ 5,650,170 $ 167,526 $ 111,780 $ 2,509 $ 5,931,985 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 September 30, 2015 Commercial real estate $ 488,840 $ 49,669 $ 88,068 — $ 626,577 Commercial and industrial 69,036 1,969 10,164 — 81,169 $ 557,876 $ 51,638 $ 98,232 — $ 707,746 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 loans by payment status: Consumer Loan Credit Quality by Payment Status Performing Non-Performing Total September 30, 2015 Direct installment $ 1,630,566 $ 12,779 $ 1,643,345 Residential mortgages 1,000,774 12,480 1,013,254 Indirect installment 971,936 1,280 973,216 Consumer lines of credit 1,000,929 2,349 1,003,278 Other 53,860 — 53,860 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 Recorded Investment Specific Reserve Total Specific Average At or for the Nine Months Ended September 30, 2015 Commercial real estate $ 35,733 $ 25,035 $ 2,057 $ 27,092 $ 919 $ 26,928 Commercial and industrial 10,981 4,770 5,107 9,877 1,590 9,565 Commercial leases 835 835 — 835 — 767 Total commercial loans and leases 47,549 30,640 7,164 37,804 2,509 37,260 Direct installment 13,569 12,779 — 12,779 — 13,538 Residential mortgages 12,971 12,480 — 12,480 — 13,744 Indirect installment 3,220 1,280 — 1,280 — 1,168 Consumer lines of credit 2,565 2,349 — 2,349 — 2,134 $ 79,874 $ 59,528 $ 7,164 $ 66,692 $ 2,509 $ 67,844 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 Payment Status of Total TDRs	Following is a summary of the payment status of originated TDRs: September 30, 2015 December 31, Accruing: Performing $ 14,692 $ 9,441 Non-performing 21,221 23,439 Non-accrual 7,800 8,272 $ 43,713 $ 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 originated loans, by class, that have been restructured: Three Months Ended September 30, 2015 Nine Months Ended September 30, 2015 Number of Contracts Pre- Modification Post- Outstanding Recorded Investment Number Pre- Modification Recorded Investment Post- Commercial real estate — $ — $ — 2 $ 312 $ 168 Commercial and industrial — — — 1 5 4 Total commercial loans — — — 3 317 172 Direct installment 121 1,757 1,726 361 5,064 4,835 Residential mortgages 10 232 233 31 1,048 1,074 Indirect installment 3 13 10 13 43 40 Consumer lines of credit 10 146 143 40 666 610 144 $ 2,148 $ 2,112 448 $ 7,138 $ 6,731 Three Months Ended September 30, 2014 Nine Months Ended September 30, 2014 Number of Contracts Pre- Modification Post- Outstanding Recorded Investment Number Pre- Modification Recorded Investment Post- Commercial real estate 1 $ 50 $ 48 10 $ 2,633 $ 2,187 Commercial and industrial 2 126 119 3 323 307 Total commercial loans 3 176 167 13 2,956 2,494 Direct installment 116 1,323 1,240 378 4,922 4,693 Residential mortgages 9 480 470 33 1,847 1,784 Indirect installment 7 18 15 20 52 48 Consumer lines of credit 6 88 56 31 899 857 141 $ 2,085 $ 1,948 475 $ 10,676 $ 9,876
Summary of Troubled Debt Restructurings by Class of Loans and Leases, Payment Default	Following is a summary of originated TDRs, by class of loans and leases, for which there was a payment default, excluding loans that were either charged-off or cured by period end. Default occurs when a loan is 90 days or more past due and is within 12 months of restructuring. Three Months Ended Nine Months Ended Number of Contracts Recorded Number of Contracts Recorded Commercial real estate — $ — — $ — Commercial and industrial — — 1 204 Total commercial loans — — 1 204 Direct installment 22 87 75 254 Residential mortgages 2 75 5 179 Indirect installment 1 6 6 12 Consumer lines of credit — — 1 8 25 $ 168 88 $ 657 Three Months Ended Nine Months Ended Number of Contracts Recorded Number of Contracts Recorded Direct installment 41 $ 356 80 $ 732 Residential mortgages 2 33 2 33 Indirect installment 3 10 4 11 Consumer lines of credit 1 50 1 50 47 $ 449 87 $ 826 (1) The recorded investment is as of period end.

Allowance for Credit Losses (Ta

Allowance for Credit Losses (Tables)	9 Months Ended
	Sep. 30, 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 Charge- Recoveries Net Provision Balance at Three Months Ended September 30, 2015 Commercial real estate $ 39,872 $ (1,259 ) $ 370 $ (889 ) $ 2,870 $ 41,853 Commercial and industrial 32,305 (584 ) 290 (294 ) 3,223 35,234 Commercial leases 2,223 (124 ) 50 (74 ) 265 2,414 Total commercial loans and leases 74,400 (1,967 ) 710 (1,257 ) 6,358 79,501 Direct installment 22,279 (2,722 ) 565 (2,157 ) 1,214 21,336 Residential mortgages 8,579 (268 ) 14 (254 ) 341 8,666 Indirect installment 8,909 (1,650 ) 264 (1,386 ) 2,090 9,613 Consumer lines of credit 9,118 (472 ) 56 (416 ) 871 9,573 Other 911 (402 ) 8 (394 ) 413 930 Total allowance on originated loans and leases 124,196 (7,481 ) 1,617 (5,864 ) 11,287 129,619 Purchased credit-impaired loans 658 — — — 36 695 Other acquired loans 6,287 (153 ) 282 129 (546 ) 5,869 Total allowance on acquired loans 6,945 (153 ) 282 129 (510 ) 6,564 Total allowance $ 131,141 $ (7,634 ) $ 1,899 $ (5,735 ) $ 10,777 $ 136,183 Nine Months Ended September 30, 2015 Commercial real estate $ 37,588 $ (3,237 ) $ 779 $ (2,458 ) $ 6,723 $ 41,853 Commercial and industrial 32,645 (2,684 ) 1,386 (1,298 ) 3,887 35,234 Commercial leases 2,398 (328 ) 95 (233 ) 249 2,414 Total commercial loans and leases 72,631 (6,249 ) 2,260 (3,989 ) 10,859 79,501 Direct installment 20,538 (8,108 ) 1,131 (6,977 ) 7,775 21,336 Residential mortgages 8,024 (891 ) 53 (838 ) 1,480 8,666 Indirect installment 7,504 (4,433 ) 898 (3,535 ) 5,644 9,613 Consumer lines of credit 8,496 (1,205 ) 132 (1,073 ) 2,150 9,573 Other 759 (1,062 ) 44 (1,018 ) 1,189 930 Total allowance on originated loans and leases 117,952 (21,948 ) 4,518 (17,430 ) 29,097 129,619 Purchased credit-impaired loans 660 (64 ) 19 (45 ) 80 695 Other acquired loans 7,314 (698 ) 653 (45 ) (1,400 ) 5,869 Total allowance on acquired loans 7,974 (762 ) 672 (90 ) (1,320 ) 6,564 Total allowance $ 125,926 $ (22,710 ) $ 5,190 $ (17,520 ) $ 27,777 $ 136,183 Three Months Ended September 30, 2014 Commercial real estate $ 38,478 $ (1,724 ) $ 506 $ (1,218 ) $ (80 ) $ 37,180 Commercial and industrial 33,017 (1,796 ) 192 (1,604 ) 2,883 34,296 Commercial leases 2,079 (167 ) 11 (156 ) 282 2,205 Total commercial loans and leases 73,574 (3,687 ) 709 (2,978 ) 3,085 73,681 Direct installment 16,844 (2,369 ) 271 (2,098 ) 4,814 19,560 Residential mortgages 5,506 (87 ) 13 (74 ) 1,218 6,650 Indirect installment 6,693 (898 ) 211 (687 ) 364 6,370 Consumer lines of credit 7,664 (360 ) 50 (310 ) 587 7,941 Other 907 (341 ) 9 (332 ) (208 ) 367 Total allowance on originated loans and leases 111,188 (7,742 ) 1,263 (6,479 ) 9,860 114,569 Purchased credit-impaired loans 448 (712 ) 1 (711 ) 1,026 763 Other acquired loans 5,112 (113 ) (41 ) (154 ) 311 5,269 Total allowance on acquired loans 5,560 (825 ) (40 ) (865 ) 1,337 6,032 Total allowance $ 116,748 $ (8,567 ) $ 1,223 $ (7,344 ) $ 11,197 $ 120,601 Nine Months Ended September 30, 2014 Commercial real estate $ 32,548 $ (5,519 ) $ 1,068 $ (4,451 ) $ 9,083 $ 37,180 Commercial and industrial 32,603 (2,849 ) 730 (2,119 ) 3,812 34,296 Commercial leases 1,903 (317 ) 93 (224 ) 526 2,205 Total commercial loans and leases 67,054 (8,685 ) 1,891 (6,794 ) 13,421 73,681 Direct installment 17,824 (7,154 ) 821 (6,333 ) 8,069 19,560 Residential mortgages 5,836 (356 ) 61 (295 ) 1,109 6,650 Indirect installment 6,409 (2,396 ) 658 (1,738 ) 1,699 6,370 Consumer lines of credit 7,231 (1,023 ) 143 (880 ) 1,590 7,941 Other 530 (910 ) 19 (891 ) 728 367 Total allowance on originated loans and leases 104,884 (20,524 ) 3,593 (16,931 ) 26,616 114,569 Purchased credit-impaired loans 1,000 (2,614 ) 1 (2,613 ) 2,376 763 Other acquired loans 4,900 (230 ) 983 753 (384 ) 5,269 Total allowance on acquired loans 5,900 (2,844 ) 984 (1,860 ) 1,992 6,032 Total allowance $ 110,784 $ (23,368 ) $ 4,577 $ (18,791 ) $ 28,608 $ 120,601
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 loan and lease balances by class: Allowance Loans and Leases Outstanding Individually Evaluated for Impairment Collectively Evaluated for Impairment Loans and Individually Evaluated for Impairment Collectively Evaluated for Impairment September 30, 2015 Commercial real estate $ 919 $ 40,934 $ 3,322,669 $ 14,182 $ 3,308,487 Commercial and industrial 1,590 33,644 2,410,186 6,186 2,404,000 Commercial leases — 2,414 199,130 — 199,130 Total commercial loans and leases 2,509 76,992 5,931,985 20,368 5,911,617 Direct installment — 21,336 1,643,345 — 1,643,345 Residential mortgages — 8,666 1,013,254 — 1,013,254 Indirect installment — 9,613 973,216 — 973,216 Consumer lines of credit — 9,573 1,003,278 — 1,003,278 Other — 930 53,860 — 53,860 $ 2,509 $ 127,110 $ 10,618,938 $ 20,368 $ 10,598,570 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

Borrowings (Tables)

Borrowings (Tables)	9 Months Ended
	Sep. 30, 2015
Debt Disclosure [Abstract]
Summary of Short-Term Borrowings	Following is a summary of short-term borrowings: September 30, 2015 December 31, Securities sold under repurchase agreements $ 256,320 $ 882,696 Federal Home Loan Bank advances 450,000 820,000 Federal funds purchased 456,000 210,000 Subordinated notes 124,982 128,962 $ 1,287,302 $ 2,041,658
Summary of Long-Term Borrowings	Following is a summary of long-term borrowings: September 30, 2015 December 31, Federal Home Loan Bank advances $ 400,017 $ 400,042 Subordinated notes 84,351 83,155 Junior subordinated debt 58,285 58,246 $ 542,653 $ 541,443
Junior Subordinated Debt Trusts	The following table provides information relating to the Trusts as of September 30, 2015: Trust Preferred Securities Common Junior Subordinated Debt Stated Interest Rate F.N.B. Statutory Trust II $ 21,500 $ 665 $ 22,165 6/15/36 1.99 % Variable; 3-month LIBOR + 165 basis points (bps) Omega Financial Capital Trust I 36,000 1,114 36,120 10/18/34 2.48 % Variable; 3-month LIBOR + 219 bps $ 57,500 $ 1,779 $ 58,285

Derivative and Hedging Activi34

Derivative and Hedging Activities (Tables)	9 Months Ended
	Sep. 30, 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: September 30, 2015 December 31, 2014 Notional Fair Value Notional Fair Value Amount Asset Liability Amount Asset Liability Gross Derivatives Subject to master netting arrangements: Interest rate contracts – designated $ 250,000 $ 4,918 $ 855 $ 200,000 $ 2,109 $ 2,330 Interest rate swaps – not designated 1,193,598 1 61,753 972,002 140 43,655 Equity contracts – not designated 1,180 12 — 1,210 47 — Total subject to master netting arrangements 1,444,778 4,931 62,608 1,173,212 2,296 45,985 Not subject to master netting arrangements: Interest rate swaps – not designated 1,193,598 61,348 1 972,002 43,602 128 Credit risk contracts – not designated 111,976 14 185 68,632 — — Equity contracts – not designated 1,180 — 12 1,210 — 47 Total not subject to master netting arrangements 1,306,754 61,362 198 1,041,844 43,602 175 $ 2,751,532 $ 66,293 $ 62,806 $ 2,215,056 $ 45,898 $ 46,160
Derivative Liabilities	The following table presents information about derivative liabilities that are subject to enforceable master netting arrangements as well as those not subject to enforceable master netting arrangements: Derivative Liabilities Subject to master netting arrangements: Interest rate contracts Designated $ 855 — $ 855 Not designated 61,753 — 61,753 Not subject to master netting arrangements: Interest rate contracts – not designated 1 — 1 Credit contracts – not designated 185 — 185 Equity contracts – not designated 12 — 12 $ 62,806 — $ 62,806 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 September 30, 2015 Derivative Assets Subject to master netting arrangements: Interest rate contracts Designated $ 4,918 — $ 4,918 Not designated 1 — 1 Equity contracts – not designated 12 — 12 Not subject to master netting arrangements: Interest rate contracts – not designated 61,348 — 61,348 Credit contracts – not designated 14 — 14 $ 66,293 — $ 66,293 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 Nine Months Ended Statement September 30, Location 2015 2014 Interest Rate Contracts Interest income - loans and leases $ 2,440 $ 2,479 Interest Rate Contracts Interest expense – short-term borrowings 115 — Interest Rate Swaps Other income (364 ) (9 ) Credit Risk Contracts Other income (170 ) —
Collateral Held By Counterparty [Member]
Derivative Liabilities	The following table presents a reconciliation of the net amounts of derivative liabilities presented in the balance sheet to the net amounts that would result in the event of offset: Derivative Liabilities Interest rate contracts: Designated $ 855 $ — $ — $ 855 Not designated 61,753 31,827 28,290 1,636 $ 62,608 $ 31,827 $ 28,290 $ 2,491 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 presented in the balance sheet to the net amounts that would result in the event of offset: Net Amount Amount Not Offset in the Balance Sheet the Balance Financial Cash Net Amount September 30, 2015 Derivative Assets Interest rate contracts: Designated $ 4,918 $ 2,557 $ 2,361 — Not designated 1 1 — — Equity contracts – not designated 12 12 — — $ 4,931 $ 2,570 $ 2,361 — 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 35

Commitments, Credit Risk and Contingencies (Tables)	9 Months Ended
	Sep. 30, 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: September 30, December 31, 2014 Commitments to extend credit $ 3,527,479 $ 3,665,481 Standby letters of credit 97,875 121,186

Stock Incentive Plans (Tables)

Stock Incentive Plans (Tables)	9 Months Ended
	Sep. 30, 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: Nine Months Ended September 30, 2015 2014 Awards Weighted Awards Weighted Unvested awards outstanding at beginning of period 1,354,093 $ 11.86 1,729,033 $ 10.23 Granted 402,947 13.16 364,065 13.61 Net adjustment due to performance 8,884 22.73 (87,512 ) 11.41 Vested (471,997 ) 10.66 (703,428 ) 8.79 Forfeited (29,428 ) 13.46 (50,849 ) 11.47 Dividend reinvestment 30,551 11.32 34,521 12.73 Unvested awards outstanding at end of period 1,295,050 12.73 1,285,830 11.90
Components of Restricted Stock Awards	The components of the restricted stock awards as of September 30, 2015 are as follows: Service- Awards Performance- Total Unvested awards 648,154 646,896 1,295,050 Unrecognized compensation expense $ 4,458 $ 2,535 $ 6,993 Intrinsic value $ 8,394 $ 8,377 $ 16,771 Weighted average remaining life (in years) 2.11 1.99 2.05
Summary of Information Concerning Stock Option Awards	The following table summarizes certain information concerning stock option awards: Nine Months Ended September 30, 2015 2014 Shares Weighted Shares Weighted Options outstanding at beginning of period 568,834 $ 8.86 533,524 $ 11.50 Assumed from acquisitions — — 805,507 7.39 Exercised (88,899 ) 5.61 (140,817 ) 6.21 Forfeited (2,182 ) 4.34 (54,962 ) 24.41 Options outstanding and exercisable at end of period 477,753 9.48 1,143,252 8.64

Retirement Plans (Tables)

Retirement Plans (Tables)	9 Months Ended
	Sep. 30, 2015
Compensation and Retirement Disclosure [Abstract]
Net Periodic Benefit Credit for Defined Benefit Plans	The net periodic benefit credit for the defined benefit plans includes the following components: Three Months Ended Nine Months Ended September 30, September 30, 2015 2014 2015 2014 Service cost $ 18 $ 15 $ 52 $ 47 Interest cost 1,470 1,610 4,424 4,802 Expected return on plan assets (2,491 ) (2,486 ) (7,473 ) (7,460 ) Amortization: Unrecognized net transition asset — (6 ) — (16 ) Unrecognized prior service cost 2 2 6 6 Unrecognized loss 518 347 1,590 1,021 Net periodic pension credit $ (483 ) $ (518 ) $ (1,401 ) $ (1,600 )

Comprehensive Income (Tables)

Comprehensive Income (Tables)	9 Months Ended
	Sep. 30, 2015
Equity [Abstract]
Components of Comprehensive Income, Net of Related Tax	The components of comprehensive income, net of related tax, are as follows: Three Months Ended Nine Months Ended September 30, September 30, 2015 2014 2015 2014 Net income $ 40,053 $ 35,391 $ 120,527 $ 104,746 Other comprehensive income (loss): Securities available for sale: Unrealized gains (losses) arising during the period, net of tax expense (benefit) of $3,649, $(1,551), $4,302 and $10,399 6,777 (2,881 ) 7,989 19,312 Reclassification adjustment for gains included in net income, net of tax expense of $110, $412, $112 and $3,995 (204 ) (766 ) (207 ) (7,420 ) Derivative instruments: Unrealized gains arising during the period, net of tax expense of $1,709, $40, $2,353 and $2,979 3,174 74 4,370 5,532 Reclassification adjustment for gains included in net income, net of tax expense of $286, $293, $854 and $867 (531 ) (543 ) (1,586 ) (1,610 ) Pension and postretirement benefit obligations: Unrealized gains arising during the period, net of tax expense of $183, $121, $560 and $355 340 224 1,040 659 Other comprehensive income (loss) 9,556 (3,892 ) 11,606 16,473 Comprehensive income $ 49,609 $ 31,499 $ 132,133 $ 121,219
Changes in AOCI, Net of Tax, by Component	The following table presents changes in AOCI, net of tax, by component: Unrealized Net Gains (Losses) on Securities Available for Sale Unrealized Net Gains Derivative Instruments Unrecognized Postretirement Obligations Total Nine Months Ended September 30, 2015 Balance at beginning of period $ (440 ) $ (143 ) $ (45,420 ) $ (46,003 ) Other comprehensive income before reclassifications 7,989 4,370 1,040 13,399 Amounts reclassified from AOCI (207 ) (1,586 ) — (1,793 ) Net current period other comprehensive income 7,782 2,784 1,040 11,606 Balance at end of period $ 7,342 $ 2,641 $ (44,380 ) $ (34,397 )

Earnings Per Common Share (Tabl

Earnings Per Common Share (Tables)	9 Months Ended
	Sep. 30, 2015
Earnings Per Share [Abstract]
Computation of Basic and Diluted Earnings Per Common Share	The following table sets forth the computation of basic and diluted earnings per common share: Three Months Ended Nine Months Ended September 30, September 30, 2015 2014 2015 2014 Net income $ 40,053 $ 35,391 $ 120,527 $ 104,746 Less: Preferred stock dividends 2,010 2,010 6,030 6,342 Net income available to common stockholders $ 38,043 $ 33,381 $ 114,497 $ 98,404 Basic weighted average common shares outstanding 175,343,789 167,260,386 174,816,692 165,229,206 Net effect of dilutive stock options, warrants, restricted stock and convertible debt 1,169,043 1,623,741 1,383,450 1,695,637 Diluted weighted average common shares outstanding 176,512,832 168,884,127 176,200,142 166,924,843 Earnings per common share: Basic $ 0.22 $ 0.20 $ 0.65 $ 0.60 Diluted $ 0.22 $ 0.20 $ 0.65 $ 0.59

Cash Flow Information (Tables)

Cash Flow Information (Tables)	9 Months Ended
	Sep. 30, 2015
Supplemental Cash Flow Elements [Abstract]
Summary of Supplemental Cash Flow Information	Following is a summary of supplemental cash flow information: Nine Months Ended September 30 2015 2014 Interest paid on deposits and other borrowings $ 35,531 $ 31,804 Income taxes paid 41,000 17,000 Transfers of loans to other real estate owned 6,901 7,784 Financing of other real estate owned sold 372 287

Business Segments (Tables)

Business Segments (Tables)	9 Months Ended
	Sep. 30, 2015
Segment Reporting [Abstract]
Financial Information for Segments of Corporation	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, international banking, business credit, capital markets and lease financing. Consumer banking products and services include deposit products, mortgage lending, consumer lending and a complete suite of mobile and online banking services. • The Wealth Management segment provides a broad range of personal and corporate fiduciary services including the administration of decedent and trust estates. In addition, it offers various alternative products, including securities brokerage and investment advisory services, mutual funds and annuities. • The Insurance segment includes a full-service insurance agency offering all lines of commercial and personal insurance through major carriers. The Insurance segment also includes a reinsurer. • The Consumer Finance segment primarily makes installment loans to individuals and purchases installment sales finance contracts from retail merchants. The Consumer Finance segment activity is funded through the sale of the Corporation’s subordinated notes at the finance company’s branch offices. The following tables provide financial information for these segments of the Corporation. The information provided under the caption “Parent and Other” represents operations not considered to be reportable segments and/or general operating expenses of the Corporation, and includes the parent company, other non-bank subsidiaries and eliminations and adjustments which are necessary for purposes of reconciliation to the consolidated amounts. Community Wealth Insurance Consumer Parent and Consolidated At or for the Three Months Ended September 30, 2015 Interest income $ 125,281 $ — $ 22 $ 10,096 $ 1,798 $ 137,197 Interest expense 10,473 — — 878 645 11,996 Net interest income 114,808 — 22 9,218 1,153 125,201 Provision for credit losses 8,702 — — 1,750 325 10,777 Non-interest income 29,667 8,682 3,602 716 (1,308 ) 41,359 Non-interest expense 80,906 6,703 3,201 4,983 322 96,115 Intangible amortization 1,824 69 141 — — 2,034 Income tax expense (benefit) 15,804 696 105 1,473 (497 ) 17,581 Net income (loss) 37,239 1,214 177 1,728 (305 ) 40,053 Total assets 16,658,489 21,099 22,201 187,721 (53,437 ) 16,836,073 Total intangibles 855,164 10,516 13,069 1,809 — 880,558 At or for the Three Months Ended September 30, 2014 Interest income $ 120,122 $ — $ 24 $ 9,773 $ 1,647 $ 131,566 Interest expense 9,435 — — 826 686 10,947 Net interest income 110,687 — 24 8,947 961 120,619 Provision for credit losses 9,427 — — 1,519 251 11,197 Non-interest income 27,179 8,174 3,373 719 (1,893 ) 37,552 Non-interest expense 79,243 6,294 2,943 4,983 (71 ) 93,392 Intangible amortization 2,282 72 101 — — 2,455 Income tax expense (benefit) 14,347 656 128 1,216 (611 ) 15,736 Net income (loss) 32,567 1,152 225 1,948 (501 ) 35,391 Total assets 15,584,832 21,892 19,148 182,301 (51,128 ) 15,757,045 Total intangibles 856,464 10,792 10,223 1,809 — 879,288 At or for the Nine Months Ended September 30, 2015 Interest income $ 371,366 $ — $ 67 $ 29,467 $ 5,114 $ 406,014 Interest expense 30,580 — — 2,593 1,952 35,125 Net interest income 340,786 — 67 26,874 3,162 370,889 Provision for credit losses 21,974 — — 5,288 515 27,777 Non-interest income 85,281 26,268 9,948 2,124 (4,328 ) 119,293 Non-interest expense 236,324 20,127 10,952 14,785 967 283,155 Intangible amortization 5,601 205 342 — — 6,148 Income tax expense (benefit) 48,744 2,143 (433 ) 3,660 (1,539 ) 52,575 Net income (loss) 113,424 3,793 (846 ) 5,265 (1,109 ) 120,527 Total assets 16,658,489 21,099 22,201 187,721 (53,437 ) 16,836,073 Total intangibles 855,164 10,516 13,069 1,809 — 880,558 At or for the Nine Months Ended September 30, 2014 Interest income $ 339,974 $ — $ 74 $ 28,716 $ 5,122 $ 373,886 Interest expense 26,413 — — 2,481 2,356 31,250 Net interest income 313,561 — 74 26,235 2,766 342,636 Provision for credit losses 23,148 — — 4,754 706 28,608 Non-interest income 86,512 23,530 10,582 2,120 (3,932 ) 118,812 Non-interest expense 231,390 19,038 8,900 14,800 1,270 275,398 Intangible amortization 6,680 216 303 — — 7,199 Income tax expense (benefit) 41,738 1,555 521 3,386 (1,703 ) 45,497 Net income (loss) 97,117 2,721 932 5,415 (1,439 ) 104,746 Total assets 15,584,832 21,892 19,148 182,301 (51,128 ) 15,757,045 Total intangibles 856,454 10,792 10,223 1,809 — 879,288

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 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 September 30, 2015 Assets Measured at Fair Value Available for sale debt securities: U.S. Treasury $ — $ 30,004 $ — $ 30,004 U.S. government-sponsored entities — 390,767 — 390,767 Residential mortgage-backed securities: Agency mortgage-backed securities — 597,120 — 597,120 Agency collateralized mortgage obligations — 527,928 — 527,928 Non-agency collateralized mortgage obligations — 7 1,220 1,227 Commercial mortgage-backed securities — 4,392 — 4,392 States of the U.S. and political subdivisions — 11,272 — 11,272 Other debt securities — 14,553 — 14,553 — 1,576,043 1,220 1,577,263 Available for sale equity securities: Financial services industry 95 656 383 1,134 Insurance services industry 129 — — 129 224 656 383 1,263 224 1,576,699 1,603 1,578,526 Derivative financial instruments: Trading — 61,361 — 61,361 Not for trading — 4,932 — 4,932 — 66,293 — 66,293 $ 224 $ 1,642,992 $ 1,603 $ 1,644,819 Liabilities Measured at Fair Value Derivative financial instruments: Trading — $ 61,766 — $ 61,766 Not for trading — 1,040 — 1,040 — $ 62,806 — $ 62,806 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 Nine Months Ended September 30, 2015 Balance at beginning of period — $ 475 $ 1,420 $ 1,895 Total gains (losses) – realized/unrealized: Included in earnings — — — — Included in other comprehensive income — (36 ) (3 ) (39 ) Accretion included in earnings — — 4 4 Purchases, issuances, sales and settlements: Purchases — — — — Issuances — — — — Sales/redemptions — — — — Settlements — — (201 ) (201 ) Transfers from Level 3 — (56 ) — (56 ) Transfers into Level 3 — — — — Balance at end of period — $ 383 $ 1,220 $ 1,603 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 September 30, 2015 Impaired loans — $ 1,016 $ 1,919 $ 2,935 Other real estate owned — 5,223 2,099 7,322 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: Carrying Fair Value Measurements Amount Fair Value Level 1 Level 2 Level 3 September 30, 2015 Financial Assets Cash and cash equivalents $ 258,766 $ 258,766 $ 258,766 $ — $ — Securities available for sale 1,578,526 1,578,526 224 1,576,699 1,603 Securities held to maturity 1,526,290 1,546,135 — 1,543,065 3,070 Net loans and leases, including loans held for sale 11,741,037 11,633,933 — — 11,633,933 Derivative assets 66,293 66,293 — 66,293 — Accrued interest receivable 44,688 44,688 44,688 — — Financial Liabilities Deposits 12,759,736 12,762,839 10,206,107 2,556,732 — Short-term borrowings 1,287,302 1,287,302 1,287,302 — — Long-term borrowings 542,653 541,120 — — 541,120 Derivative liabilities 62,806 62,806 — 62,806 — Accrued interest payable 6,283 6,283 6,283 — — 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 and leases, 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 — —

Business - Additional Informati

Business - Additional Information (Detail)	9 Months Ended
	Sep. 30, 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	73
Number of banking offices	289

Debt Offering - Additional Info

Debt Offering - Additional Information (Detail) - 4.875% Subordinated Notes Due in 2025 [Member] - Scenario, Forecast [Member] $ in Thousands	Oct. 02, 2015USD ($)
Debt Instrument [Line Items]
Aggregate principal amount	$ 100,000
Debt instrument interest rate percentage	4.875%
Proceeds from issuance of notes	$ 98,500

Mergers and Acquisitions - Addi

Mergers and Acquisitions - Additional Information (Detail) $ in Thousands	Sep. 18, 2015USD ($)Branch	Sep. 03, 2015USD ($)Branch	Aug. 04, 2015USD ($)shares	Sep. 19, 2014USD ($)shares	Feb. 15, 2014USD ($)shares	Sep. 30, 2015USD ($)	Dec. 31, 2014USD ($)
Business Acquisition [Line Items]
Goodwill recorded as a result of merger						$ 834,141	$ 832,213
BCSB Bancorp, Inc. (BCSB) [Member]
Business Acquisition [Line Items]
Deposits acquired as a result of merger					$ 532,197
Goodwill recorded as a result of merger					42,451
Core deposit intangibles recorded as result of the acquisition					6,591
Assets acquired as a result of merger					596,122
Loans acquired as a result of merger					304,932
Value of acquisition					$ 80,547
Common shares issued | shares					6,730,597
Common shares acquired | shares					3,235,961
OBA Financial Services, Inc. (OBA) [Member]
Business Acquisition [Line Items]
Deposits acquired as a result of merger				$ 295,922
Goodwill recorded as a result of merger				20,107
Core deposit intangibles recorded as result of the acquisition				4,304
Assets acquired as a result of merger				390,160
Loans acquired as a result of merger				291,393
Value of acquisition				$ 85,554
Common shares issued | shares				7,170,037
Common shares acquired | shares				4,025,895
Metro Bancorp Inc [Member]
Business Acquisition [Line Items]
Assets acquired as a result of merger			$ 3,001,357
Value of acquisition			$ 474,000
Common shares issued | shares			33,600,000
Number of shares entitled to receive as per Merger agreement, Ratio			2.373
Common shares to be acquired | shares			14,100,000
Bank of America [Member]
Business Acquisition [Line Items]
Deposits acquired as a result of merger	$ 154,619
Number of branch-banking locations acquired | Branch	5
Goodwill recorded as a result of merger	$ 2,539
Core deposit intangibles recorded as result of the acquisition	$ 3,081
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

Securities - Schedule of Amorti

Securities - Schedule of Amortized Cost and Fair Value of Securities Available for Sale (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Securities Available For Sale, Amortized Cost	$ 1,567,230	$ 1,534,771
Securities Available For Sale, Gross Unrealized Gains	17,045	11,215
Securities Available For Sale, Gross Unrealized Losses	(5,749)	(11,921)
Securities Available For Sale, Fair Value	1,578,526	1,534,065
U.S. Treasury [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available For Sale, Amortized Cost	29,704	29,604
Securities Available For Sale, Gross Unrealized Gains	300	78
Securities Available For Sale, Fair Value	30,004	29,682
U.S. Government-Sponsored Entities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available For Sale, Amortized Cost	388,428	338,330
Securities Available For Sale, Gross Unrealized Gains	2,644	742
Securities Available For Sale, Gross Unrealized Losses	(305)	(1,939)
Securities Available For Sale, Fair Value	390,767	337,133
Agency Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available For Sale, Amortized Cost	587,244	546,572
Securities Available For Sale, Gross Unrealized Gains	9,958	7,548
Securities Available For Sale, Gross Unrealized Losses	(82)	(35)
Securities Available For Sale, Fair Value	597,120	554,085
Securities Available For Sale, Fair Value	597,120
Agency Collateralized Mortgage Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available For Sale, Amortized Cost	529,656	580,601
Securities Available For Sale, Gross Unrealized Gains	3,220	1,617
Securities Available For Sale, Gross Unrealized Losses	(4,948)	(9,047)
Securities Available For Sale, Fair Value	527,928	573,171
Securities Available For Sale, Fair Value	527,928
Non-Agency Collateralized Mortgage Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available For Sale, Amortized Cost	1,212	1,414
Securities Available For Sale, Gross Unrealized Gains	15	17
Securities Available For Sale, Fair Value	1,227	1,431
Securities Available For Sale, Fair Value	1,227
Commercial Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available For Sale, Amortized Cost	4,384	7,891
Securities Available For Sale, Gross Unrealized Gains	8
Securities Available For Sale, Gross Unrealized Losses		(11)
Securities Available For Sale, Fair Value	4,392	7,880
Securities Available For Sale, Fair Value	4,392
States of the U.S. and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available For Sale, Amortized Cost	10,927	12,713
Securities Available For Sale, Gross Unrealized Gains	345	477
Securities Available For Sale, Gross Unrealized Losses		(32)
Securities Available For Sale, Fair Value	11,272	13,158
Other Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available For Sale, Amortized Cost	14,700	16,615
Securities Available For Sale, Gross Unrealized Gains	267	420
Securities Available For Sale, Gross Unrealized Losses	(414)	(857)
Securities Available For Sale, Fair Value	14,553	16,178
Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available For Sale, Amortized Cost	1,566,255	1,533,740
Securities Available For Sale, Gross Unrealized Gains	16,757	10,899
Securities Available For Sale, Gross Unrealized Losses	(5,749)	(11,921)
Securities Available For Sale, Fair Value	1,577,263	1,532,718
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available For Sale, Amortized Cost	975	1,031
Securities Available For Sale, Gross Unrealized Gains	288	316
Securities Available For Sale, Gross Unrealized Losses	0	0
Securities Available For Sale, Fair Value	1,263	$ 1,347
Securities Available For Sale, Fair Value	$ 1,263

Securities - Schedule of Amor47

Securities - Schedule of Amortized Cost and Fair Value of Securities Held to Maturity (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Investment Securities Held To Maturity [Line Items]
Securities Held To Maturity, Amortized Cost	$ 1,526,290	$ 1,453,355
Securities Held To Maturity, Gross Unrealized Gains	24,947	23,145
Securities Held To Maturity, Gross Unrealized Losses	(5,102)	(8,242)
Securities held to maturity, fair value	1,546,135	1,468,258
U.S. Treasury [Member]
Investment Securities Held To Maturity [Line Items]
Securities Held To Maturity, Amortized Cost	500	502
Securities Held To Maturity, Gross Unrealized Gains	169	168
Securities held to maturity, fair value	669	670
U.S. Government-Sponsored Entities [Member]
Investment Securities Held To Maturity [Line Items]
Securities Held To Maturity, Amortized Cost	146,528	101,602
Securities Held To Maturity, Gross Unrealized Gains	1,964	885
Securities Held To Maturity, Gross Unrealized Losses	(79)	(524)
Securities held to maturity, fair value	148,413	101,963
Agency Mortgage-Backed Securities [Member]
Investment Securities Held To Maturity [Line Items]
Securities Held To Maturity, Amortized Cost	669,221	677,169
Securities Held To Maturity, Gross Unrealized Gains	15,887	16,712
Securities Held To Maturity, Gross Unrealized Losses	(16)	(346)
Securities held to maturity, fair value	685,092	693,535
Agency Collateralized Mortgage Obligations [Member]
Investment Securities Held To Maturity [Line Items]
Securities Held To Maturity, Amortized Cost	462,191	501,965
Securities Held To Maturity, Gross Unrealized Gains	3,556	1,858
Securities Held To Maturity, Gross Unrealized Losses	(4,181)	(7,329)
Securities held to maturity, fair value	461,566	496,494
Non-Agency Collateralized Mortgage Obligations [Member]
Investment Securities Held To Maturity [Line Items]
Securities Held To Maturity, Amortized Cost	3,055	4,285
Securities Held To Maturity, Gross Unrealized Gains	15	28
Securities held to maturity, fair value	3,070	4,313
Commercial Mortgage-Backed Securities [Member]
Investment Securities Held To Maturity [Line Items]
Securities Held To Maturity, Amortized Cost	17,334	17,560
Securities Held To Maturity, Gross Unrealized Gains	468	179
Securities held to maturity, fair value	17,802	17,739
States of the U.S. and Political Subdivisions [Member]
Investment Securities Held To Maturity [Line Items]
Securities Held To Maturity, Amortized Cost	227,461	150,272
Securities Held To Maturity, Gross Unrealized Gains	2,888	3,315
Securities Held To Maturity, Gross Unrealized Losses	(826)	(43)
Securities held to maturity, fair value	$ 229,523	$ 153,544

Securities - Gross Gains and Gr

Securities - Gross Gains and Gross Losses Realized on Sales of Securities (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Investments, Debt and Equity Securities [Abstract]
Gross gains	$ 314	$ 1,191	$ 328	$ 19,939
Gross losses		(13)	(9)	(8,524)
Total	$ 314	$ 1,178	$ 319	$ 11,415

Securities - Additional Informa

Securities - Additional Information (Detail) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2015USD ($)Security	Sep. 30, 2014USD ($)	Mar. 31, 2014USD ($)Securities	Sep. 30, 2015USD ($)Security	Sep. 30, 2014USD ($)	Dec. 31, 2014USD ($)
Schedule Of Securities [Line Items]
Number of pooled issue securities | Securities			23
Net proceeds from sale of securities				$ 33,499	$ 175,872
Net securities (losses) gains	$ 314	$ 1,178		319	11,415
Securities pledged to secure public deposits, trust deposits and for other purposes, carrying value	2,062,257			2,062,257		$ 1,036,380
Securities pledged as collateral for short-term borrowings, carrying value	$ 258,428			$ 258,428		$ 892,647
Number of single-issuer securities | Security	3			3
Estimated fair value of single-issue trust preferred securities	$ 4,480			$ 4,480
Amortized cost of single-issue trust preferred securities	4,894			4,894
Impairment losses on securities				0	$ 0
Municipal bond portfolio, value	$ 238,733			$ 238,733
Municipal Bonds [Member]
Schedule Of Securities [Line Items]
Percentage of formal credit enhancement insurance of municipalities	83.00%			83.00%
Municipal Bonds [Member] | Weighted Average [Member]
Schedule Of Securities [Line Items]
Average holding size of securities in bond portfolio				$ 1,492
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				93.60%
Pooled TPS [Member]
Schedule Of Securities [Line Items]
Net proceeds from sale of securities			$ 51,540
Net securities (losses) gains			13,766
Other Securities [Member]
Schedule Of Securities [Line Items]
Net securities (losses) gains			$ (3,529)

Securities - Amortized Cost and

Securities - Amortized Cost and Fair Value of Securities, by Contractual Maturities (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Schedule Of Securities [Line Items]
Available for Sale, Due in one year or less, Amortized Cost	$ 4,994
Available for Sale, Due from one to five years, Amortized Cost	423,858
Available for Sale, Due from five to ten years, Amortized Cost	10,013
Available for Sale, Due after ten years, Amortized Cost	4,894
Available for Sale, with contractual maturities, Amortized Cost	443,759
Total securities available for sale, Amortized Cost	1,567,230	$ 1,534,771
Available for Sale, Due in one year or less, Fair Value	5,027
Available for Sale, Due from one to five years, Fair Value	426,751
Available for Sale, Due from five to ten years, Fair Value	10,338
Available for Sale, Due after ten years, Fair Value	4,480
Available for Sale, with contractual maturities, Fair Value	446,596
Total available for sale Securities, Fair Value	1,578,526	1,534,065
Held to Maturity, Due in one year or less, Amortized Cost	1,940
Held to Maturity, Due from one to five years, Amortized Cost	139,429
Held to Maturity, Due from five to ten years, Amortized Cost	71,708
Held to Maturity, Due after ten years, Amortized Cost	161,412
Securities Held To Maturity, with contractual maturities, Amortized Cost	374,489
Held to Maturity, with contractual maturities, Amortized Cost	1,526,290	1,453,355
Held to Maturity, Due in one year or less, Fair Value	1,951
Held to Maturity, Due from one to five years, Fair Value	140,465
Held to Maturity, Due from five to ten years, Fair Value	73,681
Held to Maturity, Due after ten years, Fair Value	162,508
Securities Held To Maturity, with contractual maturities, Fair Value	378,605
Held to Maturity, with contractual maturities, Fair Value	1,546,135	1,468,258
Agency Mortgage-Backed Securities [Member]
Schedule Of Securities [Line Items]
Total securities available for sale, Amortized Cost	587,244	546,572
Total available for sale Securities, Fair Value	597,120
Held to Maturity, with contractual maturities, Amortized Cost	669,221	677,169
Held to Maturity, with contractual maturities, Fair Value	685,092	693,535
Agency Collateralized Mortgage Obligations [Member]
Schedule Of Securities [Line Items]
Total securities available for sale, Amortized Cost	529,656	580,601
Total available for sale Securities, Fair Value	527,928
Held to Maturity, with contractual maturities, Amortized Cost	462,191	501,965
Held to Maturity, with contractual maturities, Fair Value	461,566	496,494
Non-Agency Collateralized Mortgage Obligations [Member]
Schedule Of Securities [Line Items]
Total securities available for sale, Amortized Cost	1,212	1,414
Total available for sale Securities, Fair Value	1,227
Held to Maturity, with contractual maturities, Amortized Cost	3,055	4,285
Held to Maturity, with contractual maturities, Fair Value	3,070	4,313
Commercial Mortgage-Backed Securities [Member]
Schedule Of Securities [Line Items]
Total securities available for sale, Amortized Cost	4,384	7,891
Total available for sale Securities, Fair Value	4,392
Held to Maturity, with contractual maturities, Amortized Cost	17,334	17,560
Held to Maturity, with contractual maturities, Fair Value	17,802	17,739
Equity Securities [Member]
Schedule Of Securities [Line Items]
Total securities available for sale, Amortized Cost	975	$ 1,031
Total available for sale Securities, Fair Value	$ 1,263

Securities - Summaries of Fair

Securities - Summaries of Fair Values and Unrealized Losses of Securities, Segregated by Length of Impairment (Detail) $ in Thousands	Sep. 30, 2015USD ($)Security	Dec. 31, 2014USD ($)Security
Schedule Of Securities [Line Items]
Number of available for sale securities, Less than 1 year | Security	8	19
Number of available for sale securities, Greater than 1 year | Security	24	28
Number of available for sale securities | Security	32	47
Securities Available For Sale, Less than 12 Months, Fair Value	$ 142,054	$ 309,919
Securities Available For Sale, Less than 12 Months, Unrealized Losses	(382)	(1,559)
Securities Available For Sale, 12 Months or More, Fair Value	270,357	332,215
Securities Available For Sale, 12 Months or More, Unrealized Losses	(5,367)	(10,362)
Securities Available For Sale, Fair Value, Total	412,411	642,134
Securities Available For Sale, Unrealized Losses, Total	$ (5,749)	$ (11,921)
Number of held to maturity securities | Security	43	36
Securities Held To Maturity, Less than 12 Months, Fair Value	$ 93,053	$ 131,586
Securities Held To Maturity, Less than 12 Months, Unrealized Losses	(1,038)	(675)
Securities Held To Maturity, Greater than 12 Months, Fair Value	186,204	269,653
Securities Held To Maturity, Greater than 12 Months, Unrealized Losses	(4,064)	(7,567)
Securities Held To Maturity, Fair Value, Total	279,257	401,239
Securities Held To Maturity, Unrealized Losses, Total	$ (5,102)	$ (8,242)
Less than 12 Months [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities | Security	27	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	3	7
Number of available for sale securities, Greater than 1 year | Security	3	7
Number of available for sale securities | Security	6	14
Securities Available For Sale, Less than 12 Months, Fair Value	$ 59,823	$ 89,986
Securities Available For Sale, Less than 12 Months, Unrealized Losses	(177)	(275)
Securities Available For Sale, 12 Months or More, Fair Value	37,867	99,326
Securities Available For Sale, 12 Months or More, Unrealized Losses	(128)	(1,664)
Securities Available For Sale, Fair Value, Total	97,690	189,312
Securities Available For Sale, Unrealized Losses, Total	$ (305)	$ (1,939)
Number of held to maturity securities | Security	1	4
Securities Held To Maturity, Less than 12 Months, Fair Value		$ 24,989
Securities Held To Maturity, Less than 12 Months, Unrealized Losses		(40)
Securities Held To Maturity, Greater than 12 Months, Fair Value	$ 14,921	29,516
Securities Held To Maturity, Greater than 12 Months, Unrealized Losses	(79)	(484)
Securities Held To Maturity, Fair Value, Total	14,921	54,505
Securities Held To Maturity, Unrealized Losses, Total	$ (79)	$ (524)
U.S. Government-Sponsored Entities [Member] | Less than 12 Months [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities | Security		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	1	2
Number of available for sale securities | Security	1	2
Securities Available For Sale, Less than 12 Months, Fair Value	$ 18,591	$ 45,145
Securities Available For Sale, Less than 12 Months, Unrealized Losses	(82)	(35)
Securities Available For Sale, Fair Value, Total	18,591	45,145
Securities Available For Sale, Unrealized Losses, Total	$ (82)	$ (35)
Number of held to maturity securities | Security	1	5
Securities Held To Maturity, Less than 12 Months, Fair Value		$ 1,099
Securities Held To Maturity, Less than 12 Months, Unrealized Losses		(1)
Securities Held To Maturity, Greater than 12 Months, Fair Value	$ 924	45,042
Securities Held To Maturity, Greater than 12 Months, Unrealized Losses	(16)	(345)
Securities Held To Maturity, Fair Value, Total	924	46,141
Securities Held To Maturity, Unrealized Losses, Total	$ (16)	$ (346)
Agency Mortgage-Backed Securities [Member] | Less than 12 Months [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities | Security		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	4	9
Number of available for sale securities, Greater than 1 year | Security	18	16
Number of available for sale securities | Security	22	25
Securities Available For Sale, Less than 12 Months, Fair Value	$ 63,640	$ 166,908
Securities Available For Sale, Less than 12 Months, Unrealized Losses	(123)	(1,238)
Securities Available For Sale, 12 Months or More, Fair Value	228,010	225,700
Securities Available For Sale, 12 Months or More, Unrealized Losses	(4,825)	(7,809)
Securities Available For Sale, Fair Value, Total	291,650	392,608
Securities Available For Sale, Unrealized Losses, Total	$ (4,948)	$ (9,047)
Number of held to maturity securities | Security	17	22
Securities Held To Maturity, Less than 12 Months, Fair Value	$ 46,120	$ 104,071
Securities Held To Maturity, Less than 12 Months, Unrealized Losses	(212)	(630)
Securities Held To Maturity, Greater than 12 Months, Fair Value	170,359	189,642
Securities Held To Maturity, Greater than 12 Months, Unrealized Losses	(3,969)	(6,699)
Securities Held To Maturity, Fair Value, Total	216,479	293,713
Securities Held To Maturity, Unrealized Losses, Total	$ (4,181)	$ (7,329)
Agency Collateralized Mortgage Obligations [Member] | Less than 12 Months [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities | Security	3	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
Number of available for sale securities | Security		1
Securities Available For Sale, Less than 12 Months, Fair Value		$ 7,880
Securities Available For Sale, Less than 12 Months, Unrealized Losses		(11)
Securities Available For Sale, Fair Value, Total		7,880
Securities Available For Sale, Unrealized Losses, Total		$ (11)
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	24	5
Securities Held To Maturity, Less than 12 Months, Fair Value	$ 46,933	$ 1,427
Securities Held To Maturity, Less than 12 Months, Unrealized Losses	(826)	(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	46,933	6,880
Securities Held To Maturity, Unrealized Losses, Total	$ (826)	$ (43)
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	24	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	$ 4,480	$ 6,030
Securities Available For Sale, 12 Months or More, Unrealized Losses	(414)	(857)
Securities Available For Sale, Fair Value, Total	4,480	6,030
Securities Available For Sale, Unrealized Losses, Total	$ (414)	$ (857)

Securities - Summary of Cumulat

Securities - Summary of Cumulative Credit-Related OTTI Charges (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 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	Sep. 30, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Federal Home Loan Bank stock	$ 44,845	$ 54,751

Loans and Leases - Summary of L

Loans and Leases - Summary of Loans and Leases, Net of Unearned Income (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	$ 11,873,645	$ 11,247,038
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	3,949,246	3,815,708
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	2,491,355	2,318,015
Commercial Leases [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	199,130	177,824
Total Commercial Loans and Leases [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	6,639,731	6,311,547
Direct Installment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	1,692,638	1,644,621
Residential Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	1,386,386	1,263,053
Indirect Installment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	974,028	875,551
Consumer Lines of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	1,127,002	1,110,976
Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	53,860	41,290
Originated Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	10,618,938	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	3,322,669	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	2,410,186	2,197,793
Originated Loans [Member] | Commercial Leases [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	199,130	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	5,931,985	5,407,427
Originated Loans [Member] | Direct Installment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	1,643,345	1,579,770
Originated Loans [Member] | Residential Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	1,013,254	817,586
Originated Loans [Member] | Indirect Installment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	973,216	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	1,003,278	946,427
Originated Loans [Member] | Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	53,860	41,290
Acquired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	1,254,707	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	626,577	783,898
Acquired Loans [Member] | Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	81,169	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	707,746	904,120
Acquired Loans [Member] | Direct Installment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	49,293	64,851
Acquired Loans [Member] | Residential Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	373,132	445,467
Acquired Loans [Member] | Indirect Installment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	812	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	$ 123,724	$ 164,549

Loans and Leases - Additional I

Loans and Leases - Additional Information (Detail) - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Consumer loans	$ 181,298		$ 180,588
Commercial construction loans	294,249		296,156
Carrying amount	$ 11,873,645		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	6,564		7,974
Restructured loans returned to performing status	7,577
Valuation for impairment of loans with pooled reserves	500		500
Pooled reserves for all other classes of loans	3,350		3,448
Consumer Lines of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount	1,127,002		1,110,976
Allowance for loan losses	642		267
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount	3,949,246		3,815,708
Allowance for loan losses	3,056		3,286
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount	2,491,355		2,318,015
Allowance for loan losses	579		1,484
Direct Installment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount	1,692,638		1,644,621
Allowance for loan losses	1,427		1,847
Residential Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount	1,386,386		1,263,053
Allowance for loan losses	558		858
Indirect Installment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount	974,028		875,551
Allowance for loan losses	302		232
Purchased Credit-Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount	8,766		9,556
Specific reserves for commercial TDRs [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Reserves in allowance for loan losses, TDRs	438		371
Pooled reserves for commercial TDRs [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Reserves in allowance for loan losses, TDRs	$ 1,146		$ 1,215
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] | Loans and Leases Receivable Net of Deferred Income [Member] | Constuction Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of portfolio	2.50%		2.60%
Loan Portfolio Diversification Risk [Member] | Commercial Real Estate Loans [Member] | Owner-Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of portfolio	38.90%		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	61.10%		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	$ 4,285
Mortgage loans on real estate, foreclosure	$ 12,786

Loans and Leases - Summary of O

Loans and Leases - Summary of Outstanding Principal Balance and Carrying Amount of Acquired Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount	$ 11,873,645	$ 11,247,038
Accounted for under ASC 310-30 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	1,345,685	1,597,558
Carrying amount	1,094,604	1,344,171
Accounted for under ASC 310-20 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	159,695	242,488
Carrying amount	153,539	228,748
Acquired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	1,505,380	1,840,046
Carrying amount	$ 1,248,143	$ 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	9 Months Ended
	Sep. 30, 2015	Sep. 30, 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		71,111
Reduction due to unexpected early payoffs	(35,601)	(34,747)
Reclass from non-accretable difference	24,489	9,925
Disposals/transfers	(509)	(5,390)
Accretion	(46,207)	(54,664)
Balance at end of period	$ 274,071	$ 291,881

Loans and Leases - Summary of N

Loans and Leases - Summary of Non-Performing Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled debt restructurings	$ 43,713	$ 41,152
Non-Performing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	47,298	45,113
Troubled debt restructurings	21,221	23,439
Total non-performing loans	68,519	68,552
Other real estate owned (OREO)	38,931	41,466
Total non-performing assets	$ 107,450	$ 110,018
Non-performing loans as a percent of total loans and leases	0.58%	0.61%
Non-performing loans + OREO as a percent of total loans and leases + OREO	0.90%	0.97%
Non-performing assets as a percent of total assets	0.64%	0.68%

Loans and Leases - Age Analysis

Loans and Leases - Age Analysis of Past Due Loans, by Class (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	$ 11,873,645	$ 11,247,038
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	3,949,246	3,815,708
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	2,491,355	2,318,015
Commercial Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	199,130	177,824
Total Commercial Loans and Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	6,639,731	6,311,547
Direct Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	1,692,638	1,644,621
Residential Mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	1,386,386	1,263,053
Indirect Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	974,028	875,551
Consumer Lines of Credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	1,127,002	1,110,976
Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	53,860	41,290
Originated Loans and Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	43,330	41,275
> 90 Days Past Due and Still Accruing	6,000	9,248
Non-Accrual	45,436	45,113
Total Past Due	94,766	95,636
Current	10,524,172	9,570,509
Total Loans	10,618,938	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	6,040	9,601
> 90 Days Past Due and Still Accruing	3	313
Non-Accrual	25,262	24,132
Total Past Due	31,305	34,046
Current	3,291,364	2,997,764
Total Loans	3,322,669	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	3,854	2,446
> 90 Days Past Due and Still Accruing	3	3
Non-Accrual	9,529	8,310
Total Past Due	13,386	10,759
Current	2,396,800	2,187,034
Total Loans	2,410,186	2,197,793
Originated Loans and Leases [Member] | Commercial Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	709	961
> 90 Days Past Due and Still Accruing	14	43
Non-Accrual	835	722
Total Past Due	1,558	1,726
Current	197,572	176,098
Total Loans	199,130	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	10,603	13,008
> 90 Days Past Due and Still Accruing	20	359
Non-Accrual	35,626	33,164
Total Past Due	46,249	46,531
Current	5,885,736	5,360,896
Total Loans	5,931,985	5,407,427
Originated Loans and Leases [Member] | Direct Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	9,874	9,333
> 90 Days Past Due and Still Accruing	3,326	3,617
Non-Accrual	4,718	7,117
Total Past Due	17,918	20,067
Current	1,625,427	1,559,703
Total Loans	1,643,345	1,579,770
Originated Loans and Leases [Member] | Residential Mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	11,121	8,709
> 90 Days Past Due and Still Accruing	1,334	3,891
Non-Accrual	2,971	2,964
Total Past Due	15,426	15,564
Current	997,828	802,022
Total Loans	1,013,254	817,586
Originated Loans and Leases [Member] | Indirect Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	8,213	7,804
> 90 Days Past Due and Still Accruing	522	684
Non-Accrual	1,133	1,149
Total Past Due	9,868	9,637
Current	963,348	864,008
Total Loans	973,216	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	3,385	2,408
> 90 Days Past Due and Still Accruing	629	562
Non-Accrual	988	719
Total Past Due	5,002	3,689
Current	998,276	942,738
Total Loans	1,003,278	946,427
Originated Loans and Leases [Member] | Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	134	13
> 90 Days Past Due and Still Accruing	169	135
Total Past Due	303	148
Current	53,557	41,142
Total Loans	53,860	41,290
Acquired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	21,604	24,678
> 90 Days Past Due and Still Accruing	28,551	38,024
Non-Accrual	1,862
Total Past Due	52,017	62,702
Current	1,288,288	1,612,959
Discount	(85,598)	(94,768)
Total Loans	1,254,707	1,580,893
Acquired Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	10,510	12,076
> 90 Days Past Due and Still Accruing	11,108	12,368
Non-Accrual	1,303
Total Past Due	22,921	24,444
Current	641,768	799,991
Discount	(38,112)	(40,537)
Total Loans	626,577	783,898
Acquired Loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	686	687
> 90 Days Past Due and Still Accruing	527	1,968
Non-Accrual	107
Total Past Due	1,320	2,655
Current	87,163	127,535
Discount	(7,314)	(9,968)
Total Loans	81,169	120,222
Acquired Loans [Member] | Total Commercial Loans and Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	11,196	12,763
> 90 Days Past Due and Still Accruing	11,635	14,336
Non-Accrual	1,410
Total Past Due	24,241	27,099
Current	728,931	927,526
Discount	(45,426)	(50,505)
Total Loans	707,746	904,120
Acquired Loans [Member] | Direct Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	670	2,670
> 90 Days Past Due and Still Accruing	834	1,443
Total Past Due	1,504	4,113
Current	46,981	59,532
Discount	808	1,206
Total Loans	49,293	64,851
Acquired Loans [Member] | Residential Mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	8,607	8,159
> 90 Days Past Due and Still Accruing	15,261	19,936
Total Past Due	23,868	28,095
Current	386,425	456,810
Discount	(37,161)	(39,438)
Total Loans	373,132	445,467
Acquired Loans [Member] | Indirect Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	26	38
> 90 Days Past Due and Still Accruing	11	30
Total Past Due	37	68
Current	801	2,179
Discount	(26)	(341)
Total Loans	812	1,906
Acquired Loans [Member] | Consumer Lines of Credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	1,105	1,048
> 90 Days Past Due and Still Accruing	810	2,279
Non-Accrual	452
Total Past Due	2,367	3,327
Current	125,150	166,912
Discount	(3,793)	(5,690)
Total Loans	$ 123,724	$ 164,549

Loans and Leases - Summary of60

Loans and Leases - Summary of Commercial Loans and Leases by Credit Quality (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Acquired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	$ 707,746	$ 904,120
Acquired Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	626,577	783,898
Acquired Loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	81,169	120,222
Originated Loans and Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	5,931,985	5,407,427
Originated Loans and Leases [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	3,322,669	3,031,810
Originated Loans and Leases [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	2,410,186	2,197,793
Originated Loans and Leases [Member] | Commercial Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	199,130	177,824
Pass [Member] | Acquired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	557,876	714,122
Pass [Member] | Acquired Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	488,840	610,260
Pass [Member] | Acquired Loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	69,036	103,862
Pass [Member] | Originated Loans and Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	5,650,170	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	3,195,455	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	2,259,932	2,085,893
Pass [Member] | Originated Loans and Leases [Member] | Commercial Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	194,783	174,677
Special Mention [Member] | Acquired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	51,638	77,397
Special Mention [Member] | Acquired Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	49,669	73,891
Special Mention [Member] | Acquired Loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	1,969	3,506
Special Mention [Member] | Originated Loans and Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	167,526	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	60,727	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	103,650	71,420
Special Mention [Member] | Originated Loans and Leases [Member] | Commercial Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	3,149	2,198
Substandard [Member] | Acquired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	98,232	112,601
Substandard [Member] | Acquired Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	88,068	99,747
Substandard [Member] | Acquired Loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	10,164	12,854
Substandard [Member] | Originated Loans and Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	111,780	122,584
Substandard [Member] | Originated Loans and Leases [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	65,568	81,951
Substandard [Member] | Originated Loans and Leases [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	45,014	39,684
Substandard [Member] | Originated Loans and Leases [Member] | Commercial Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	1,198	949
Doubtful [Member] | Originated Loans and Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	2,509	1,195
Doubtful [Member] | Originated Loans and Leases [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	919	399
Doubtful [Member] | Originated Loans and Leases [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	$ 1,590	$ 796

Loans and Leases - Summary of61

Loans and Leases - Summary of Consumer Loans by Payment Status (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Credit Quality [Line Items]
Total Loans	$ 11,873,645	$ 11,247,038
Non-Performing [Member]
Credit Quality [Line Items]
Non-Performing Loans	68,519	68,552
Direct Installment [Member]
Credit Quality [Line Items]
Total Loans	1,692,638	1,644,621
Direct Installment [Member] | Performing [Member]
Credit Quality [Line Items]
Performing Loans	1,630,566	1,565,090
Direct Installment [Member] | Non-Performing [Member]
Credit Quality [Line Items]
Non-Performing Loans	12,779	14,680
Residential Mortgages [Member]
Credit Quality [Line Items]
Total Loans	1,386,386	1,263,053
Residential Mortgages [Member] | Performing [Member]
Credit Quality [Line Items]
Performing Loans	1,000,774	802,522
Residential Mortgages [Member] | Non-Performing [Member]
Credit Quality [Line Items]
Non-Performing Loans	12,480	15,064
Indirect Installment [Member]
Credit Quality [Line Items]
Total Loans	974,028	875,551
Indirect Installment [Member] | Performing [Member]
Credit Quality [Line Items]
Performing Loans	971,936	872,340
Indirect Installment [Member] | Non-Performing [Member]
Credit Quality [Line Items]
Non-Performing Loans	1,280	1,305
Consumer Lines of Credit [Member] | Performing [Member]
Credit Quality [Line Items]
Performing Loans	1,000,929	944,631
Consumer Lines of Credit [Member] | Non-Performing [Member]
Credit Quality [Line Items]
Non-Performing Loans	2,349	1,796
Other [Member]
Credit Quality [Line Items]
Total Loans	53,860	41,290
Other [Member] | Performing [Member]
Credit Quality [Line Items]
Performing Loans	53,860	41,290
Originated Loans [Member]
Credit Quality [Line Items]
Total Loans	10,618,938	9,666,145
Originated Loans [Member] | Direct Installment [Member]
Credit Quality [Line Items]
Total Loans	1,643,345	1,579,770
Originated Loans [Member] | Residential Mortgages [Member]
Credit Quality [Line Items]
Total Loans	1,013,254	817,586
Originated Loans [Member] | Indirect Installment [Member]
Credit Quality [Line Items]
Total Loans	973,216	873,645
Originated Loans [Member] | Consumer Lines of Credit [Member]
Credit Quality [Line Items]
Total Loans	1,003,278	946,427
Originated Loans [Member] | Other [Member]
Credit Quality [Line Items]
Total Loans	$ 53,860	$ 41,290

Loans and Leases - Summary of I

Loans and Leases - Summary of Impaired Loans, by Class (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	$ 79,874	$ 81,765
Recorded Investment With No Specific Reserve	59,528	66,619
Recorded Investment With Specific Reserve	7,164	2,831
Total Recorded Investment	66,692	69,450
Specific Reserve	2,509	1,179
Average Recorded Investment	67,844	75,367
Commercial Real Estate [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	35,733	34,583
Recorded Investment With No Specific Reserve	25,035	25,443
Recorded Investment With Specific Reserve	2,057	883
Total Recorded Investment	27,092	26,326
Specific Reserve	919	399
Average Recorded Investment	26,928	30,807
Commercial and Industrial [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	10,981	11,412
Recorded Investment With No Specific Reserve	4,770	7,609
Recorded Investment With Specific Reserve	5,107	1,948
Total Recorded Investment	9,877	9,557
Specific Reserve	1,590	780
Average Recorded Investment	9,565	9,510
Commercial Leases [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	835	722
Recorded Investment With No Specific Reserve	835	722
Total Recorded Investment	835	722
Average Recorded Investment	767	686
Total Commercial Loans and Leases [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	47,549	46,717
Recorded Investment With No Specific Reserve	30,640	33,774
Recorded Investment With Specific Reserve	7,164	2,831
Total Recorded Investment	37,804	36,605
Specific Reserve	2,509	1,179
Average Recorded Investment	37,260	41,003
Direct Installment [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	13,569	14,987
Recorded Investment With No Specific Reserve	12,779	14,680
Total Recorded Investment	12,779	14,680
Average Recorded Investment	13,538	14,248
Residential Mortgages [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	12,971	16,791
Recorded Investment With No Specific Reserve	12,480	15,064
Total Recorded Investment	12,480	15,064
Average Recorded Investment	13,744	16,924
Indirect Installment [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	3,220	1,467
Recorded Investment With No Specific Reserve	1,280	1,305
Total Recorded Investment	1,280	1,305
Average Recorded Investment	1,168	1,399
Consumer Lines of Credit [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	2,565	1,803
Recorded Investment With No Specific Reserve	2,349	1,796
Total Recorded Investment	2,349	1,796
Average Recorded Investment	$ 2,134	$ 1,793

Loans and Leases - Summary of P

Loans and Leases - Summary of Payment Status of Total TDRs (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings ("TDRs")	$ 43,713	$ 41,152
Performing [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings ("TDRs")	14,692	9,441
Non-Performing [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings ("TDRs")	21,221	23,439
Non-Accrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings ("TDRs")	$ 7,800	$ 8,272

Loans and Leases - Summary of T

Loans and Leases - Summary of Troubled Debt Restructurings by Class of Loans (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015USD ($)Contract	Sep. 30, 2014USD ($)Contract	Sep. 30, 2015USD ($)Contract	Sep. 30, 2014USD ($)Contract
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	144	141	448	475
Pre-Modification Outstanding Recorded Investment	$ 2,148	$ 2,085	$ 7,138	$ 10,676
Post-Modification Outstanding Recorded Investment	$ 2,112	$ 1,948	$ 6,731	$ 9,876
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract		1	2	10
Pre-Modification Outstanding Recorded Investment		$ 50	$ 312	$ 2,633
Post-Modification Outstanding Recorded Investment		$ 48	$ 168	$ 2,187
Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract		2	1	3
Pre-Modification Outstanding Recorded Investment		$ 126	$ 5	$ 323
Post-Modification Outstanding Recorded Investment		$ 119	$ 4	$ 307
Total Commercial Loans and Leases [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract		3	3	13
Pre-Modification Outstanding Recorded Investment		$ 176	$ 317	$ 2,956
Post-Modification Outstanding Recorded Investment		$ 167	$ 172	$ 2,494
Direct Installment [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	121	116	361	378
Pre-Modification Outstanding Recorded Investment	$ 1,757	$ 1,323	$ 5,064	$ 4,922
Post-Modification Outstanding Recorded Investment	$ 1,726	$ 1,240	$ 4,835	$ 4,693
Residential Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	10	9	31	33
Pre-Modification Outstanding Recorded Investment	$ 232	$ 480	$ 1,048	$ 1,847
Post-Modification Outstanding Recorded Investment	$ 233	$ 470	$ 1,074	$ 1,784
Indirect Installment [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	3	7	13	20
Pre-Modification Outstanding Recorded Investment	$ 13	$ 18	$ 43	$ 52
Post-Modification Outstanding Recorded Investment	$ 10	$ 15	$ 40	$ 48
Consumer Lines of Credit [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	10	6	40	31
Pre-Modification Outstanding Recorded Investment	$ 146	$ 88	$ 666	$ 899
Post-Modification Outstanding Recorded Investment	$ 143	$ 56	$ 610	$ 857

Loans and Leases - Summary of65

Loans and Leases - Summary of Troubled Debt Restructurings by Class of Loans and Leases, Payment Default (Detail) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2015USD ($)Contract	Sep. 30, 2014USD ($)Contract	Sep. 30, 2015USD ($)Contract	Sep. 30, 2014USD ($)Contract
Financing Receivable, Modifications [Line Items]
Number of Contracts		25	47	88	87
Recorded Investment | $	[1]	$ 168	$ 449	$ 657	$ 826
Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts				1
Recorded Investment | $	[1]			$ 204
Total Commercial Loans and Leases [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts				1
Recorded Investment | $	[1]			$ 204
Direct Installment [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts		22	41	75	80
Recorded Investment | $	[1]	$ 87	$ 356	$ 254	$ 732
Residential Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts		2	2	5	2
Recorded Investment | $	[1]	$ 75	$ 33	$ 179	$ 33
Indirect Installment [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts		1	3	6	4
Recorded Investment | $	[1]	$ 6	$ 10	$ 12	$ 11
Consumer Lines of Credit [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts			1	1	1
Recorded Investment | $	[1]		$ 50	$ 8	$ 50
[1]	The recorded investment is as of period end.

Allowance for Credit Losses - A

Allowance for Credit Losses - Additional Information (Detail) $ in Thousands	Sep. 30, 2015USD ($)
Receivables [Abstract]
Minimum reserves for commercial loan	$ 500

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	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Schedule Of Allowance For Loan Losses [Line Items]
Balance at Beginning of Period	$ 131,141	$ 116,748	$ 125,926	$ 110,784
Charge- Offs	(7,634)	(8,567)	(22,710)	(23,368)
Recoveries	1,899	1,223	5,190	4,577
Net Charge- Offs	(5,735)	(7,344)	(17,520)	(18,791)
Provision for credit losses	10,777	11,197	27,777	28,608
Balance at End of Period	136,183	120,601	136,183	120,601
Originated Loans [Member]
Schedule Of Allowance For Loan Losses [Line Items]
Balance at Beginning of Period	124,196	111,188	117,952	104,884
Charge- Offs	(7,481)	(7,742)	(21,948)	(20,524)
Recoveries	1,617	1,263	4,518	3,593
Net Charge- Offs	(5,864)	(6,479)	(17,430)	(16,931)
Provision for credit losses	11,287	9,860	29,097	26,616
Balance at End of Period	129,619	114,569	129,619	114,569
Acquired Loans [Member]
Schedule Of Allowance For Loan Losses [Line Items]
Balance at Beginning of Period	6,945	5,560	7,974	5,900
Charge- Offs	(153)	(825)	(762)	(2,844)
Recoveries	282	(40)	672	984
Net Charge- Offs	129	(865)	(90)	(1,860)
Provision for credit losses	(510)	1,337	(1,320)	1,992
Balance at End of Period	6,564	6,032	6,564	6,032
Commercial Real Estate [Member]
Schedule Of Allowance For Loan Losses [Line Items]
Balance at Beginning of Period	39,872	38,478	37,588	32,548
Charge- Offs	(1,259)	(1,724)	(3,237)	(5,519)
Recoveries	370	506	779	1,068
Net Charge- Offs	(889)	(1,218)	(2,458)	(4,451)
Provision for credit losses	2,870	(80)	6,723	9,083
Balance at End of Period	41,853	37,180	41,853	37,180
Commercial and Industrial [Member]
Schedule Of Allowance For Loan Losses [Line Items]
Balance at Beginning of Period	32,305	33,017	32,645	32,603
Charge- Offs	(584)	(1,796)	(2,684)	(2,849)
Recoveries	290	192	1,386	730
Net Charge- Offs	(294)	(1,604)	(1,298)	(2,119)
Provision for credit losses	3,223	2,883	3,887	3,812
Balance at End of Period	35,234	34,296	35,234	34,296
Commercial Leases [Member]
Schedule Of Allowance For Loan Losses [Line Items]
Balance at Beginning of Period	2,223	2,079	2,398	1,903
Charge- Offs	(124)	(167)	(328)	(317)
Recoveries	50	11	95	93
Net Charge- Offs	(74)	(156)	(233)	(224)
Provision for credit losses	265	282	249	526
Balance at End of Period	2,414	2,205	2,414	2,205
Total Commercial Loans and Leases [Member]
Schedule Of Allowance For Loan Losses [Line Items]
Balance at Beginning of Period	74,400	73,574	72,631	67,054
Charge- Offs	(1,967)	(3,687)	(6,249)	(8,685)
Recoveries	710	709	2,260	1,891
Net Charge- Offs	(1,257)	(2,978)	(3,989)	(6,794)
Provision for credit losses	6,358	3,085	10,859	13,421
Balance at End of Period	79,501	73,681	79,501	73,681
Direct Installment [Member]
Schedule Of Allowance For Loan Losses [Line Items]
Balance at Beginning of Period	22,279	16,844	20,538	17,824
Charge- Offs	(2,722)	(2,369)	(8,108)	(7,154)
Recoveries	565	271	1,131	821
Net Charge- Offs	(2,157)	(2,098)	(6,977)	(6,333)
Provision for credit losses	1,214	4,814	7,775	8,069
Balance at End of Period	21,336	19,560	21,336	19,560
Residential Mortgages [Member]
Schedule Of Allowance For Loan Losses [Line Items]
Balance at Beginning of Period	8,579	5,506	8,024	5,836
Charge- Offs	(268)	(87)	(891)	(356)
Recoveries	14	13	53	61
Net Charge- Offs	(254)	(74)	(838)	(295)
Provision for credit losses	341	1,218	1,480	1,109
Balance at End of Period	8,666	6,650	8,666	6,650
Indirect Installment [Member]
Schedule Of Allowance For Loan Losses [Line Items]
Balance at Beginning of Period	8,909	6,693	7,504	6,409
Charge- Offs	(1,650)	(898)	(4,433)	(2,396)
Recoveries	264	211	898	658
Net Charge- Offs	(1,386)	(687)	(3,535)	(1,738)
Provision for credit losses	2,090	364	5,644	1,699
Balance at End of Period	9,613	6,370	9,613	6,370
Consumer Lines of Credit [Member]
Schedule Of Allowance For Loan Losses [Line Items]
Balance at Beginning of Period	9,118	7,664	8,496	7,231
Charge- Offs	(472)	(360)	(1,205)	(1,023)
Recoveries	56	50	132	143
Net Charge- Offs	(416)	(310)	(1,073)	(880)
Provision for credit losses	871	587	2,150	1,590
Balance at End of Period	9,573	7,941	9,573	7,941
Other [Member]
Schedule Of Allowance For Loan Losses [Line Items]
Balance at Beginning of Period	911	907	759	530
Charge- Offs	(402)	(341)	(1,062)	(910)
Recoveries	8	9	44	19
Net Charge- Offs	(394)	(332)	(1,018)	(891)
Provision for credit losses	413	(208)	1,189	728
Balance at End of Period	930	367	930	367
Purchased Credit-Impaired Loans [Member]
Schedule Of Allowance For Loan Losses [Line Items]
Balance at Beginning of Period	658	448	660	1,000
Charge- Offs		(712)	(64)	(2,614)
Recoveries		1	19	1
Net Charge- Offs		(711)	(45)	(2,613)
Provision for credit losses	36	1,026	80	2,376
Balance at End of Period	695	763	695	763
Other Acquired Loans [Member]
Schedule Of Allowance For Loan Losses [Line Items]
Balance at Beginning of Period	6,287	5,112	7,314	4,900
Charge- Offs	(153)	(113)	(698)	(230)
Recoveries	282	(41)	653	983
Net Charge- Offs	129	(154)	(45)	753
Provision for credit losses	(546)	311	(1,400)	(384)
Balance at End of Period	$ 5,869	$ 5,269	$ 5,869	$ 5,269

Allowance for Credit Losses -68

Allowance for Credit Losses - Summary of Individual and Collective Allowance for Credit Losses and Loan and Lease Balances by Class (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Valuation Allowance [Line Items]
Allowance, Individually Evaluated for Impairment	$ 2,509	$ 1,179
Allowance, Collectively Evaluated for Impairment	127,110	116,773
Loans and Leases	11,873,645	11,247,038
Loans Outstanding, Individually Evaluated for Impairment	20,368	19,789
Loans Outstanding, Collectively Evaluated for Impairment	10,598,570	9,646,356
Commercial Real Estate [Member]
Valuation Allowance [Line Items]
Allowance, Individually Evaluated for Impairment	919	399
Allowance, Collectively Evaluated for Impairment	40,934	37,189
Loans and Leases	3,949,246	3,815,708
Loans Outstanding, Individually Evaluated for Impairment	14,182	13,952
Loans Outstanding, Collectively Evaluated for Impairment	3,308,487	3,017,858
Commercial and Industrial [Member]
Valuation Allowance [Line Items]
Allowance, Individually Evaluated for Impairment	1,590	780
Allowance, Collectively Evaluated for Impairment	33,644	31,865
Loans and Leases	2,491,355	2,318,015
Loans Outstanding, Individually Evaluated for Impairment	6,186	5,837
Loans Outstanding, Collectively Evaluated for Impairment	2,404,000	2,191,956
Commercial Leases [Member]
Valuation Allowance [Line Items]
Allowance, Collectively Evaluated for Impairment	2,414	2,398
Loans and Leases	199,130	177,824
Loans Outstanding, Collectively Evaluated for Impairment	199,130	177,824
Total Commercial Loans and Leases [Member]
Valuation Allowance [Line Items]
Allowance, Individually Evaluated for Impairment	2,509	1,179
Allowance, Collectively Evaluated for Impairment	76,992	71,452
Loans and Leases	6,639,731	6,311,547
Loans Outstanding, Individually Evaluated for Impairment	20,368	19,789
Loans Outstanding, Collectively Evaluated for Impairment	5,911,617	5,387,638
Direct Installment [Member]
Valuation Allowance [Line Items]
Allowance, Collectively Evaluated for Impairment	21,336	20,538
Loans and Leases	1,692,638	1,644,621
Loans Outstanding, Collectively Evaluated for Impairment	1,643,345	1,579,770
Residential Mortgages [Member]
Valuation Allowance [Line Items]
Allowance, Collectively Evaluated for Impairment	8,666	8,024
Loans and Leases	1,386,386	1,263,053
Loans Outstanding, Collectively Evaluated for Impairment	1,013,254	817,586
Indirect Installment [Member]
Valuation Allowance [Line Items]
Allowance, Collectively Evaluated for Impairment	9,613	7,504
Loans and Leases	974,028	875,551
Loans Outstanding, Collectively Evaluated for Impairment	973,216	873,645
Consumer Lines of Credit [Member]
Valuation Allowance [Line Items]
Allowance, Collectively Evaluated for Impairment	9,573	8,496
Loans and Leases	1,127,002	1,110,976
Loans Outstanding, Collectively Evaluated for Impairment	1,003,278	946,427
Other [Member]
Valuation Allowance [Line Items]
Allowance, Collectively Evaluated for Impairment	930	759
Loans and Leases	53,860	41,290
Loans Outstanding, Collectively Evaluated for Impairment	53,860	41,290
Originated Loans [Member]
Valuation Allowance [Line Items]
Loans and Leases	10,618,938	9,666,145
Originated Loans [Member] | Commercial Real Estate [Member]
Valuation Allowance [Line Items]
Loans and Leases	3,322,669	3,031,810
Originated Loans [Member] | Commercial and Industrial [Member]
Valuation Allowance [Line Items]
Loans and Leases	2,410,186	2,197,793
Originated Loans [Member] | Commercial Leases [Member]
Valuation Allowance [Line Items]
Loans and Leases	199,130	177,824
Originated Loans [Member] | Total Commercial Loans and Leases [Member]
Valuation Allowance [Line Items]
Loans and Leases	5,931,985	5,407,427
Originated Loans [Member] | Direct Installment [Member]
Valuation Allowance [Line Items]
Loans and Leases	1,643,345	1,579,770
Originated Loans [Member] | Residential Mortgages [Member]
Valuation Allowance [Line Items]
Loans and Leases	1,013,254	817,586
Originated Loans [Member] | Indirect Installment [Member]
Valuation Allowance [Line Items]
Loans and Leases	973,216	873,645
Originated Loans [Member] | Consumer Lines of Credit [Member]
Valuation Allowance [Line Items]
Loans and Leases	1,003,278	946,427
Originated Loans [Member] | Other [Member]
Valuation Allowance [Line Items]
Loans and Leases	$ 53,860	$ 41,290

Borrowings - Summary of Short-T

Borrowings - Summary of Short-Term Borrowings (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Debt Disclosure [Abstract]
Securities sold under repurchase agreements	$ 256,320	$ 882,696
Federal Home Loan Bank advances	450,000	820,000
Federal funds purchased	456,000	210,000
Subordinated notes	124,982	128,962
Short-term borrowings	$ 1,287,302	$ 2,041,658

Borrowings - Summary of Long-Te

Borrowings - Summary of Long-Term Borrowings (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Debt Disclosure [Abstract]
Federal Home Loan Bank advances	$ 400,017	$ 400,042
Subordinated notes	84,351	83,155
Junior subordinated debt	58,285	58,246
Long-term debt	$ 542,653	$ 541,443

Borrowings - Additional Informa

Borrowings - Additional Information (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2015USD ($)Trust	Dec. 31, 2014USD ($)
Debt Instrument [Line Items]
Credit available with FHLB	$ 4,467,170
Credit with FHLB used	$ 850,017
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%
Number of unconsolidated subsidiary trusts | Trust	2
Percent of the common equity of each Trust owned by the Corporation	100.00%
Junior subordinated debt	$ 58,285	$ 58,246
Trust Preferred Securities Subject to Mandatory Redemption [Member]
Debt Instrument [Line Items]
Percentage of TPS moving from tier 1 capital to tier 2 capital for 2015	25.00%
Junior subordinated debt	$ 57,500
Percentage of TPS moving from tier 1 capital to tier 2 capital for 2016	75.00%

Borrowings - Junior Subordinate

Borrowings - Junior Subordinated Debt Trusts (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Subordinated Borrowing [Line Items]
Junior subordinated debt	$ 58,285	$ 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	1.99%
Description of variable rate	Variable; 3-month 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	$ 36,120
Stated Maturity Date	Oct. 18, 2034
Interest Rate	2.48%
Description of variable rate	Variable; 3-month 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

Derivative and Hedging Activi73

Derivative and Hedging Activities - Schedule of Notional Amounts and Gross Fair Values of Derivative Assets and Derivative Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Notional amount	$ 2,751,532	$ 2,215,056
Fair value, asset	66,293	45,898
Liability	62,806	46,160
Interest Rate Contracts [Member]
Derivatives, Fair Value [Line Items]
Notional amount	250,000	200,000
Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Notional amount	1,193,598	972,002
Credit Risk Contract [Member]
Derivatives, Fair Value [Line Items]
Fair value, asset	14
Equity Contracts [Member]
Derivatives, Fair Value [Line Items]
Liability	12
Subject to Master Netting Arrangement [Member]
Derivatives, Fair Value [Line Items]
Notional amount	1,444,778	1,173,212
Fair value, asset	4,931	2,296
Liability	62,608	45,985
Subject to Master Netting Arrangement [Member] | Interest Rate Contracts [Member]
Derivatives, Fair Value [Line Items]
Notional amount	250,000	200,000
Fair value, asset	4,918	2,109
Liability	855	2,330
Subject to Master Netting Arrangement [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Notional amount	1,193,598	972,002
Fair value, asset	1	140
Liability	61,753	43,655
Subject to Master Netting Arrangement [Member] | Credit Risk Contract [Member]
Derivatives, Fair Value [Line Items]
Notional amount	1,180	1,210
Fair value, asset	12	47
Subject to Master Netting Arrangement [Member] | Equity Contracts [Member]
Derivatives, Fair Value [Line Items]
Fair value, asset	12	47
Not Subject to Master Netting Arrangement [Member]
Derivatives, Fair Value [Line Items]
Notional amount	1,306,754	1,041,844
Fair value, asset	61,362	43,602
Liability	198	175
Not Subject to Master Netting Arrangement [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Notional amount	1,193,598	972,002
Fair value, asset	61,348	43,602
Liability	1	128
Not Subject to Master Netting Arrangement [Member] | Credit Risk Contract [Member]
Derivatives, Fair Value [Line Items]
Notional amount	111,976	68,632
Fair value, asset	14
Liability	185
Not Subject to Master Netting Arrangement [Member] | Equity Contracts [Member]
Derivatives, Fair Value [Line Items]
Notional amount	1,180	1,210
Liability	$ 12	$ 47

Derivative and Hedging Activi74

Derivative and Hedging Activities - Additional Information (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Derivative [Line Items]
Notional amount	$ 2,751,532		$ 2,215,056
Derivative assets	66,293		45,898
Derivative liabilities	62,806		46,160
Amounts reclassified from AOCI	(1,793)
Additional amount in excess of posted collateral required in case of breached agreements	1,816		1,862
Interest Rate Contracts [Member]
Derivative [Line Items]
Notional amount	$ 250,000		200,000
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	$ 2,219
Derivative gains to be reclassified within twelve months, net of tax	1,443
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	2,440	$ 2,479
Interest Rate Contracts [Member] | Interest Income - Loans and Leases [Member] | Amount Reclassified from Other Comprehensive Income [Member]
Derivative [Line Items]
Derivative financial instrument, net	2,440
Amounts reclassified from AOCI	1,586
Interest Rate Contracts [Member] | Interest Expense - Short-term Borrowings [Member]
Derivative [Line Items]
Derivative financial instrument, net	115
Interest Rate Contracts [Member] | Interest Expense - Short-term Borrowings [Member] | Amount Reclassified from Other Comprehensive Income [Member]
Derivative [Line Items]
Derivative financial instrument, net	115
Amounts reclassified from AOCI	75
Interest Rate Swap [Member]
Derivative [Line Items]
Notional amount	1,193,598		972,002
Credit Risk Contract Sold [Member]
Derivative [Line Items]
Notional amount	$ 74,010
Risk participation agreements, minimum term	2 years
Risk participation agreements, maximum term	9 years
Maximum exposure under credit risk agreement assuming customer default	$ 185		25
Trading Assets [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative assets	61,349		43,742
Not for Trading Assets [Member] | Interest Rate Contracts [Member]
Derivative [Line Items]
Derivative assets	4,918		2,109
Trading Liabilities [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative liabilities	61,754		43,783
Not for Trading Liabilities [Member] | Interest Rate Contracts [Member]
Derivative [Line Items]
Derivative liabilities	$ 855		$ 2,330

Derivative and Hedging Activi75

Derivative and Hedging Activities - Offsetting of Derivative Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Gross Amount	$ 66,293	$ 45,898
Gross Amounts Offset in the Balance Sheet, Derivative Assets	0	0
Net Amount Presented in the Balance Sheet	66,293	45,898
Credit Risk Contract [Member]
Derivatives, Fair Value [Line Items]
Gross Amount	14
Gross Amounts Offset in the Balance Sheet, Derivative Assets	0
Net Amount Presented in the Balance Sheet	14
Subject to Master Netting Arrangement [Member]
Derivatives, Fair Value [Line Items]
Net Amount Presented in the Balance Sheet	4,931	2,296
Subject to Master Netting Arrangement [Member] | Interest Rate Contracts [Member]
Derivatives, Fair Value [Line Items]
Gross Amount	4,918	2,109
Gross Amounts Offset in the Balance Sheet, Derivative Assets	0	0
Net Amount Presented in the Balance Sheet	4,918	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	12	47
Gross Amounts Offset in the Balance Sheet, Derivative Assets	0	0
Net Amount Presented in the Balance Sheet	12	47
Subject to Master Netting Arrangement [Member] | Credit Risk Contract [Member]
Derivatives, Fair Value [Line Items]
Net Amount Presented in the Balance Sheet	12	47
Not Subject to Master Netting Arrangement [Member]
Derivatives, Fair Value [Line Items]
Net Amount Presented in the Balance Sheet	61,362	43,602
Not Subject to Master Netting Arrangement [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Gross Amount	61,348	43,602
Gross Amounts Offset in the Balance Sheet, Derivative Assets	0	0
Net Amount Presented in the Balance Sheet	61,348	$ 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	$ 14

Derivative and Hedging Activi76

Derivative and Hedging Activities - Offsetting of Derivative Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Gross Amount	$ 62,806	$ 46,160
Gross Amounts Offset in the Balance Sheet, Derivative Liabilities	0	0
Net Amount Presented in the Balance Sheet	62,806	46,160
Equity Contracts [Member]
Derivatives, Fair Value [Line Items]
Gross Amount	12
Gross Amounts Offset in the Balance Sheet, Derivative Liabilities	0
Net Amount Presented in the Balance Sheet	12
Subject to Master Netting Arrangement [Member]
Derivatives, Fair Value [Line Items]
Net Amount Presented in the Balance Sheet	62,608	45,985
Subject to Master Netting Arrangement [Member] | Interest Rate Contracts [Member]
Derivatives, Fair Value [Line Items]
Gross Amount	855	2,330
Gross Amounts Offset in the Balance Sheet, Derivative Liabilities	0	0
Net Amount Presented in the Balance Sheet	855	2,330
Subject to Master Netting Arrangement [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Gross Amount	61,753	43,655
Gross Amounts Offset in the Balance Sheet, Derivative Liabilities	0	0
Net Amount Presented in the Balance Sheet	61,753	43,655
Not Subject to Master Netting Arrangement [Member]
Derivatives, Fair Value [Line Items]
Net Amount Presented in the Balance Sheet	198	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] | Equity Contracts [Member]
Derivatives, Fair Value [Line Items]
Gross Amount		47
Gross Amounts Offset in the Balance Sheet, Derivative Liabilities		0
Net Amount Presented in the Balance Sheet	12	$ 47
Not Subject to Master Netting Arrangement [Member] | Credit Risk Contract [Member]
Derivatives, Fair Value [Line Items]
Gross Amount	185
Gross Amounts Offset in the Balance Sheet, Derivative Liabilities	0
Net Amount Presented in the Balance Sheet	$ 185

Derivative and Hedging Activi77

Derivative and Hedging Activities - Derivative Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Derivative [Line Items]
Net Amount Presented in the Balance Sheet	$ 66,293	$ 45,898
Subject to Master Netting Arrangement [Member]
Derivative [Line Items]
Net Amount Presented in the Balance Sheet	4,931	2,296
Gross Amounts Not Offset in the Balance Sheet Financial Instruments, Derivative Assets	2,570	995
Gross Amounts Not Offset in the Balance Sheet Cash Collateral Received, Derivative Assets	2,361	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	4,918	2,109
Gross Amounts Not Offset in the Balance Sheet Financial Instruments, Derivative Assets	2,557	810
Gross Amounts Not Offset in the Balance Sheet Cash Collateral Received, Derivative Assets	2,361	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	12	47
Gross Amounts Not Offset in the Balance Sheet Financial Instruments, Derivative Assets	12	47
Net Amount, Derivative Assets	$ 0	$ 0

Derivative and Hedging Activi78

Derivative and Hedging Activities - Derivative Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Derivative [Line Items]
Net Amount Presented in the Balance Sheet	$ 62,806	$ 46,160
Subject to Master Netting Arrangement [Member]
Derivative [Line Items]
Net Amount Presented in the Balance Sheet	62,608	45,985
Gross Amount Not Offset in the Balance Sheet Financial Instruments, Derivative Liabilities	31,827	30,976
Gross Amount Not Offset in the Balance Sheet Cash Collateral Pledged, Derivative Liabilities	28,290	13,243
Net Amount, Derivative Liabilities	2,491	1,766
Subject to Master Netting Arrangement [Member] | Interest Rate Contracts [Member]
Derivative [Line Items]
Net Amount Presented in the Balance Sheet	855	2,330
Gross Amount Not Offset in the Balance Sheet Financial Instruments, Derivative Liabilities		2,330
Net Amount, Derivative Liabilities	855
Subject to Master Netting Arrangement [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Net Amount Presented in the Balance Sheet	61,753	43,655
Gross Amount Not Offset in the Balance Sheet Financial Instruments, Derivative Liabilities	31,827	28,646
Gross Amount Not Offset in the Balance Sheet Cash Collateral Pledged, Derivative Liabilities	28,290	13,243
Net Amount, Derivative Liabilities	$ 1,636	$ 1,766

Derivative and Hedging Activi79

Derivative and Hedging Activities - Effect of Corporation's Derivative Financial Instruments on Income Statement (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Interest Rate Contracts [Member] | Interest Income - Loans and Leases [Member]
Derivative [Line Items]
Derivative financial instrument, net	$ 2,440	$ 2,479
Interest Rate Contracts [Member] | Interest Expense - Short-term Borrowings [Member]
Derivative [Line Items]
Derivative financial instrument, net	115
Interest Rate Swap [Member] | Other Income [Member]
Derivative [Line Items]
Derivative financial instrument, net	(364)	$ (9)
Credit Risk Contract [Member] | Other Income [Member]
Derivative [Line Items]
Derivative financial instrument, net	$ (170)

Commitments, Credit Risk and 80

Commitments, Credit Risk and Contingencies - Summary of Off-Balance Sheet Credit Risk Information (Detail) - USD ($) $ in Thousands	Sep. 30, 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	$ 3,527,479	$ 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	$ 97,875	$ 121,186

Commitments, Credit Risk and 81

Commitments, Credit Risk and Contingencies - Additional Information (Detail)	Sep. 30, 2015
Commitments and Contingencies Disclosure [Abstract]
Percentage of Commitments to extend credit dependent upon the financial condition of the customers	75.30%

Stock Incentive Plans - Additio

Stock Incentive Plans - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Jun. 30, 2015	Apr. 06, 2013	Jan. 01, 2012	Jun. 16, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock awards issued	402,947	364,065
Aggregate, weighted average grant date fair value	$ 5,302	$ 4,954
Common stock shares available under incentive compensation plans	2,072,110
Unrecognized compensation expense	$ 6,993
Stock options exercised	88,899	140,817
Intrinsic value of outstanding and exercisable stock options	$ 1,522
Common shares available for purchase under warrants						651,042
Parkvale Financial Corporation [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	$ 3.27
Warrant issued	342,564
Warrants converted to purchase common stock	374,221
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense related to restricted stock awards	$ 3,287	$ 2,294
Tax benefit related to restricted stock awards	1,150	803
Total fair value of awards vested	5,912	$ 10,670
Unrecognized compensation expense	6,993
Amount subject to accelerated vesting under Incentive Compensation Plan	$ 70
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options exercised	88,899	99,284
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 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
Service-Based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of awards issued, years	3 years
Unrecognized compensation expense	$ 4,458
Performance-Based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of awards issued, years	3 years
Unrecognized compensation expense	$ 2,535
Warrant Expires in 2018 [Member] | Parkvale Financial Corporation [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrant issued, exercise price					$ 5.81
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	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Awards, Unvested awards outstanding at beginning of period	1,354,093	1,729,033
Awards, Granted	402,947	364,065
Awards, Net adjustment due to performance	8,884	(87,512)
Awards, Vested	(471,997)	(703,428)
Awards, Forfeited	(29,428)	(50,849)
Awards, Dividend reinvestment	30,551	34,521
Awards, Unvested awards outstanding at end of period	1,295,050	1,285,830
Weighted Average Grant Price, Unvested awards outstanding at beginning of period	$ 11.86	$ 10.23
Weighted Average Grant Price, Granted	13.16	13.61
Weighted Average Grant Price, Net adjustment due to performance	22.73	11.41
Weighted Average Grant Price, Vested	10.66	8.79
Weighted Average Grant Price, Forfeited	13.46	11.47
Weighted Average Grant Price, Dividend reinvestment	11.32	12.73
Weighted Average Grant Price, Unvested awards outstanding at end of period	$ 12.73	$ 11.90

Stock Incentive Plans - Compone

Stock Incentive Plans - Components of Restricted Stock Awards (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested awards	1,295,050	1,354,093	1,285,830	1,729,033
Unrecognized compensation expense	$ 6,993
Intrinsic value	$ 16,771
Weighted average remaining life (in years)	2 years 18 days
Service-Based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested awards	648,154
Unrecognized compensation expense	$ 4,458
Intrinsic value	$ 8,394
Weighted average remaining life (in years)	2 years 1 month 10 days
Performance-Based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested awards	646,896
Unrecognized compensation expense	$ 2,535
Intrinsic value	$ 8,377
Weighted average remaining life (in years)	1 year 11 months 27 days

Stock Incentive Plans - Summa85

Stock Incentive Plans - Summary of Information Concerning Stock Option Awards (Detail) - $ / shares	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Shares, Options outstanding at beginning of period	568,834	533,524
Shares, Assumed from acquisitions		805,507
Shares, Exercised	(88,899)	(140,817)
Shares, Forfeited	(2,182)	(54,962)
Shares, Options outstanding and exercisable at end of period	477,753	1,143,252
Weighted Average Exercise Price, Options outstanding at beginning of period	$ 8.86	$ 11.50
Weighted Average Exercise Price, Assumed from acquisitions		7.39
Weighted Average Price per Share, Exercised	5.61	6.21
Weighted Average Exercise Price, Forfeited	4.34	24.41
Weighted Average Exercise Price, Options outstanding and exercisable at end of period	$ 9.48	$ 8.64

Retirement Plans - Additional I

Retirement Plans - Additional Information (Detail) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2015USD ($)RetirementPlans	Sep. 30, 2014USD ($)	Dec. 31, 2014	Dec. 31, 2008
Disclosure Retirement Plans [Abstract]
Number of supplemental non-qualified retirement plans sponsored by the Corporation	2
Consecutive calendar years used to calculate BRP benefits				5 years
Term of employment for consideration of BRP				10 years
Percent of employer match	100.00%		100.00%
Employee contribution percentage	6.00%		4.00%
Additional automatic contribution increase, percentage			3.00%
Additional discretionary contribution, performance goals, percentage	3.00%		2.00%
Contribution expense of the Corporation | $	$ 5,794	$ 7,595

Retirement Plans - Net Periodic

Retirement Plans - Net Periodic Benefit Credit for Defined Benefit Plans (Detail) - Defined Benefit Plans [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 18	$ 15	$ 52	$ 47
Interest cost	1,470	1,610	4,424	4,802
Expected return on plan assets	(2,491)	(2,486)	(7,473)	(7,460)
Amortization:
Unrecognized net transition asset		(6)		(16)
Unrecognized prior service cost	2	2	6	6
Unrecognized loss	518	347	1,590	1,021
Net periodic pension credit	$ (483)	$ (518)	$ (1,401)	$ (1,600)

Comprehensive Income - Componen

Comprehensive Income - Components of Comprehensive Income, Net of Related Tax (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Components Of Comprehensive Income [Abstract]
Net income	$ 40,053	$ 35,391	$ 120,527	$ 104,746
Securities available for sale, Unrealized gains (losses) arising during the period, net of tax expense (benefit) of $3,649, $(1,551), $4,302 and $10,399	6,777	(2,881)	7,989	19,312
Securities available for sale, Reclassification adjustment for gains included in net income, net of tax expense of $110, $412, $112 and $3,995	(204)	(766)	(207)	(7,420)
Unrealized gains on derivative instruments arising during the period, net of tax expense of $1,709, $40, $2,353 and $2,979	3,174	74	4,370	5,532
Reclassification adjustment on derivative instruments for gains included in net income, net of tax expense of $286, $293, $854 and $867	(531)	(543)	(1,586)	(1,610)
Unrealized gains on pension and postretirement benefit obligations arising during the period, net of tax expense of $183, $121, $560 and $355	340	224	1,040	659
Other comprehensive income (loss)	9,556	(3,892)	11,606	16,473
Comprehensive income	$ 49,609	$ 31,499	$ 132,133	$ 121,219

Comprehensive Income - Compon89

Comprehensive Income - Components of Comprehensive Income, Net of Related Tax (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Components Of Comprehensive Income [Abstract]
Securities available for sale, Unrealized gains (losses) arising during the period, net of tax expense (benefit)	$ 3,649	$ (1,551)	$ 4,302	$ 10,399
Securities available for sale, Reclassification adjustment for gains included in net income, tax expense	110	412	112	3,995
Unrealized gains on derivative instruments arising during the period, net of tax expense	1,709	40	2,353	2,979
Reclassification adjustment on derivative instruments for gains included in net income, tax expense	286	293	854	867
Unrealized gains on pension and postretirement benefit obligations arising during the period, tax expense	$ 183	$ 121	$ 560	$ 355

Comprehensive Income - Changes

Comprehensive Income - Changes in AOCI, Net of Tax, by Component (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), balance at beginning of period			$ (46,003)
Other comprehensive income before reclassifications			13,399
Amounts reclassified from AOCI			(1,793)
Net current period other comprehensive income	$ 9,556	$ (3,892)	11,606	$ 16,473
Accumulated other comprehensive income (loss), balance at end of period	(34,397)		(34,397)
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 before reclassifications			7,989
Amounts reclassified from AOCI			(207)
Net current period other comprehensive income			7,782
Accumulated other comprehensive income (loss), balance at end of period	7,342		7,342
Unrealized Net Gains (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 before reclassifications			4,370
Amounts reclassified from AOCI			(1,586)
Net current period other comprehensive income			2,784
Accumulated other comprehensive income (loss), balance at end of period	2,641		2,641
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 before reclassifications			1,040
Net current period other comprehensive income			1,040
Accumulated other comprehensive income (loss), balance at end of period	$ (44,380)		$ (44,380)

Earnings Per Common Share - Com

Earnings Per Common Share - Computation of Basic and Diluted Earnings Per Common Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share [Abstract]
Net income	$ 40,053	$ 35,391	$ 120,527	$ 104,746
Less: Preferred stock dividends	2,010	2,010	6,030	6,342
Net income available to common stockholders	$ 38,043	$ 33,381	$ 114,497	$ 98,404
Basic weighted average common shares outstanding	175,343,789	167,260,386	174,816,692	165,229,206
Net effect of dilutive stock options, warrants, restricted stock and convertible debt	1,169,043	1,623,741	1,383,450	1,695,637
Diluted weighted average common shares outstanding	176,512,832	168,884,127	176,200,142	166,924,843
Basic	$ 0.22	$ 0.20	$ 0.65	$ 0.60
Diluted	$ 0.22	$ 0.20	$ 0.65	$ 0.59

Earnings Per Share - Additional

Earnings Per Share - Additional Information (Detail) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share [Abstract]
Common stock excluded from computation of diluted earnings per share	19,385	32,419	20,440	38,151

Cash Flow Information - Summary

Cash Flow Information - Summary of Supplemental Cash Flow Information (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Statement of Cash Flows [Abstract]
Interest paid on deposits and other borrowings	$ 35,531	$ 31,804
Income taxes paid	41,000	17,000
Transfers of loans to other real estate owned	6,901	7,784
Financing of other real estate owned sold	$ 372	$ 287

Business Segments - Additional

Business Segments - Additional Information (Detail)	9 Months Ended
	Sep. 30, 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	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Segment Reporting Information [Line Items]
Interest income	$ 137,197	$ 131,566	$ 406,014	$ 373,886
Interest expense	11,996	10,947	35,125	31,250
Net interest income	125,201	120,619	370,889	342,636
Provision for credit losses	10,777	11,197	27,777	28,608
Non-interest income	41,359	37,552	119,293	118,812
Non-interest expense	96,115	93,392	283,155	275,398
Intangible amortization	2,034	2,455	6,148	7,199
Income tax expense (benefit)	17,581	15,736	52,575	45,497
Net income (loss)	40,053	35,391	120,527	104,746
Total assets	16,836,073	15,757,045	16,836,073	15,757,045	$ 16,127,090
Total intangibles	880,558	879,288	880,558	879,288
Operating Segments [Member] | Community Banking [Member]
Segment Reporting Information [Line Items]
Interest income	125,281	120,122	371,366	339,974
Interest expense	10,473	9,435	30,580	26,413
Net interest income	114,808	110,687	340,786	313,561
Provision for credit losses	8,702	9,427	21,974	23,148
Non-interest income	29,667	27,179	85,281	86,512
Non-interest expense	80,906	79,243	236,324	231,390
Intangible amortization	1,824	2,282	5,601	6,680
Income tax expense (benefit)	15,804	14,347	48,744	41,738
Net income (loss)	37,239	32,567	113,424	97,117
Total assets	16,658,489	15,584,832	16,658,489	15,584,832
Total intangibles	855,164	856,464	855,164	856,464
Operating Segments [Member] | Wealth Management [Member]
Segment Reporting Information [Line Items]
Non-interest income	8,682	8,174	26,268	23,530
Non-interest expense	6,703	6,294	20,127	19,038
Intangible amortization	69	72	205	216
Income tax expense (benefit)	696	656	2,143	1,555
Net income (loss)	1,214	1,152	3,793	2,721
Total assets	21,099	21,892	21,099	21,892
Total intangibles	10,516	10,792	10,516	10,792
Operating Segments [Member] | Insurance [Member]
Segment Reporting Information [Line Items]
Interest income	22	24	67	74
Net interest income	22	24	67	74
Non-interest income	3,602	3,373	9,948	10,582
Non-interest expense	3,201	2,943	10,952	8,900
Intangible amortization	141	101	342	303
Income tax expense (benefit)	105	128	(433)	521
Net income (loss)	177	225	(846)	932
Total assets	22,201	19,148	22,201	19,148
Total intangibles	13,069	10,223	13,069	10,223
Operating Segments [Member] | Consumer Finance [Member]
Segment Reporting Information [Line Items]
Interest income	10,096	9,773	29,467	28,716
Interest expense	878	826	2,593	2,481
Net interest income	9,218	8,947	26,874	26,235
Provision for credit losses	1,750	1,519	5,288	4,754
Non-interest income	716	719	2,124	2,120
Non-interest expense	4,983	4,983	14,785	14,800
Income tax expense (benefit)	1,473	1,216	3,660	3,386
Net income (loss)	1,728	1,948	5,265	5,415
Total assets	187,721	182,301	187,721	182,301
Total intangibles	1,809	1,809	1,809	1,809
Parent and Other [Member]
Segment Reporting Information [Line Items]
Interest income	1,798	1,647	5,114	5,122
Interest expense	645	686	1,952	2,356
Net interest income	1,153	961	3,162	2,766
Provision for credit losses	325	251	515	706
Non-interest income	(1,308)	(1,893)	(4,328)	(3,932)
Non-interest expense	322	(71)	967	1,270
Income tax expense (benefit)	(497)	(611)	(1,539)	(1,703)
Net income (loss)	(305)	(501)	(1,109)	(1,439)
Total assets	$ (53,437)	$ (51,128)	$ (53,437)	$ (51,128)

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Jun. 30, 2015	Sep. 30, 2015	Sep. 30, 2014	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
Transfer of equity security to non-marketable equity securities	$ 56
Impaired loans, carrying amount		66,692		$ 69,450
Allocated allowance for loan losses		2,508
Fair value of allocated allowance		2,935
Estimated costs to sell		216
Provision for fair value measurements included in allowance for loan losses		1,329
Carrying amount of OREO		9,320
Written down of OREO		6,476
Fair value of OREO		7,322
Estimated cost to sell OREO		846
Loss from OREO included in earnings		$ 2,844
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		$ 5,227
Allocated allowance for loan losses		2,935		1,705
Fair value of OREO		7,322		$ 8,060
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	Sep. 30, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value, Available for sale securities	$ 1,578,526	$ 1,534,065
Derivative assets	66,293	45,898
Derivative liabilities	62,806	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	30,004	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	390,767	337,133
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	527,928	573,171
Assets measured at fair value, Available for sale securities	527,928
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	1,227	1,431
Assets measured at fair value, Available for sale securities	1,227
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	4,392	7,880
Assets measured at fair value, Available for sale securities	4,392
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	11,272	13,158
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	14,553	16,178
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	224	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	1,576,699	1,531,952
Derivative assets	66,293	45,898
Derivative liabilities	62,806	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	1,603	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	1,577,263	1,532,718
Assets measured at fair value, Available for sale equity securities	1,263	1,347
Assets measured at fair value, Available for sale securities	1,578,526	1,534,065
Derivative assets	66,293	45,898
Assets measured at fair value, Total	1,644,819	1,579,963
Liabilities measured at fair value, Total	62,806	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	30,004	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	390,767	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	527,928	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	1,227	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	4,392	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	11,272	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	14,553	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	61,361	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	4,932	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	1,134	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	129	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	597,120	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	61,766	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	1,040	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	224	218
Assets measured at fair value, Available for sale securities	224	218
Assets measured at fair value, Total	224	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	95	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	129	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	1,576,043	1,531,298
Assets measured at fair value, Available for sale equity securities	656	654
Assets measured at fair value, Available for sale securities	1,576,699	1,531,952
Derivative assets	66,293	45,898
Assets measured at fair value, Total	1,642,992	1,577,850
Liabilities measured at fair value, Total	62,806	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	30,004	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	390,767	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	527,928	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	7	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	4,392	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	11,272	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	14,553	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	61,361	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	4,932	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	656	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	597,120	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	61,766	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	1,040	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	1,220	1,420
Assets measured at fair value, Available for sale equity securities	383	475
Assets measured at fair value, Available for sale securities	1,603	1,895
Assets measured at fair value, Total	1,603	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	1,220	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	$ 383	$ 475

Fair Value Measurements - Add98

Fair Value Measurements - Additional Information about Assets Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 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	(39)	5,676
Accretion included in earnings	4	662
Purchases	0	0
Issuances	0	0
Sales/redemptions		(51,527)
Settlements	(201)	(431)
Transfers from Level 3	(56)
Transfers into Level 3	0	0
Balance at end of period	1,603	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	(36)	65
Purchases	0	0
Issuances	0	0
Transfers from Level 3	(56)
Transfers into Level 3	0	0
Balance at end of period	383	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	(3)	3
Accretion included in earnings	4	5
Purchases	0	0
Issuances	0	0
Settlements	(201)	(332)
Transfers into Level 3	0	0
Balance at end of period	$ 1,220	$ 1,420

Fair Value Measurements - Add99

Fair Value Measurements - Additional Information about Assets Measured at Fair Value on Non-Recurring Basis (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	$ 2,508
Other real estate owned	7,322
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	2,935	$ 1,705
Other real estate owned	7,322	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	1,016	177
Other real estate owned	5,223	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	1,919	1,528
Other real estate owned	$ 2,099	$ 2,365

Fair Value Measurements - Fair

Fair Value Measurements - Fair Values of Corporation's Financial Instruments (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 258,766	$ 287,393	$ 237,968	$ 213,981
Securities available for sale	1,578,526	1,534,065
Securities held to maturity	1,526,290	1,453,355
Securities held to maturity	1,546,135	1,468,258
Derivative assets	66,293	45,898
Deposits	12,759,736	11,382,208
Short-term borrowings	1,287,302	2,041,658
Long-term borrowings	542,653	541,443
Derivative liabilities	62,806	46,160
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	258,766	287,393
Securities available for sale	1,578,526	1,534,065
Securities held to maturity	1,546,135	1,468,258
Net loans and leases, including loans held for sale	11,633,933	10,956,544
Derivative assets	66,293	45,898
Accrued interest receivable	44,688	40,231
Deposits	12,762,839	11,382,402
Short-term borrowings	1,287,302	2,041,672
Long-term borrowings	541,120	539,007
Derivative liabilities	62,806	46,160
Accrued interest payable	6,283	6,689
Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	258,766	287,393
Securities available for sale	1,578,526	1,534,065
Securities held to maturity	1,526,290	1,453,355
Net loans and leases, including loans held for sale	11,741,037	11,127,292
Derivative assets	66,293	45,898
Accrued interest receivable	44,688	40,231
Deposits	12,759,736	11,382,208
Short-term borrowings	1,287,302	2,041,658
Long-term borrowings	542,653	541,443
Derivative liabilities	62,806	46,160
Accrued interest payable	6,283	6,689
Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	258,766	287,393
Securities available for sale	224	218
Accrued interest receivable	44,688	40,231
Deposits	10,206,107	8,771,173
Short-term borrowings	1,287,302	2,041,672
Accrued interest payable	6,283	6,689
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available for sale	1,576,699	1,531,952
Securities held to maturity	1,543,065	1,463,945
Derivative assets	66,293	45,898
Deposits	2,556,732	2,611,229
Derivative liabilities	62,806	46,160
Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available for sale	1,603	1,895
Securities held to maturity	3,070	4,313
Net loans and leases, including loans held for sale	11,633,933	10,956,544
Long-term borrowings	$ 541,120	$ 539,007