F.N.B. (FNB) 10-Q 6 May 16 2016 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2016	Apr. 30, 2016
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q1
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		209,803,853

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Assets
Cash and due from banks	$ 260,426	$ 207,399
Interest bearing deposits with banks	85,519	281,720
Cash and Cash Equivalents	345,945	489,119
Securities available for sale	2,099,343	1,630,567
Securities held to maturity (fair value of $1,803,453 and $1,643,416)	1,776,020	1,637,061
Residential mortgage loans held for sale	7,683	4,781
Loans and leases, net of unearned income of $49,332 and $51,642	14,165,599	12,190,440
Allowance for credit losses	(147,800)	(142,012)
Net Loans and Leases	14,017,799	12,048,428
Premises and equipment, net	208,672	159,080
Goodwill	1,006,934	833,086
Core deposit and other intangible assets, net	80,116	45,644
Bank owned life insurance	310,106	308,192
Other assets	471,906	401,704
Total Assets	20,324,524	17,557,662
Liabilities
Non-interest bearing demand	3,896,782	3,059,949
Interest bearing demand	6,512,461	5,311,589
Savings	2,291,656	1,786,459
Certificates and other time deposits	2,689,584	2,465,466
Total Deposits	15,390,483	12,623,463
Short-term borrowings	1,563,888	2,048,896
Long-term borrowings	657,445	641,480
Other liabilities	194,687	147,641
Total Liabilities	17,806,503	15,461,480
Stockholders' Equity
Preferred stock-$0.01 par value; liquidation preference of $1,000 per share 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 - 211,016,267 and 176,595,060 shares	2,112	1,766
Additional paid-in capital	2,214,959	1,808,210
Retained earnings	242,045	243,217
Accumulated other comprehensive loss	(33,651)	(51,133)
Treasury stock - 1,282,976 and 1,153,390 shares at cost	(14,326)	(12,760)
Total Stockholders' Equity	2,518,021	2,096,182
Total Liabilities and Stockholders' Equity	$ 20,324,524	$ 17,557,662

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Securities held to maturity, fair value	$ 1,803,453	$ 1,643,416
Unearned income on loans	$ 49,332	$ 51,642
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, liquidation preference per share	$ 1,000	$ 1,000
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	211,016,267	176,595,060
Treasury stock, shares	1,282,976	1,153,390

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Interest Income
Loans and leases, including fees	$ 137,121	$ 117,739
Securities:
Taxable	16,493	14,214
Nontaxable	2,018	1,373
Dividends	5	11
Other	117	32
Total Interest Income	155,754	133,369
Interest Expense
Deposits	9,486	7,449
Short-term borrowings	2,361	1,768
Long-term borrowings	3,553	2,231
Total Interest Expense	15,400	11,448
Net Interest Income	140,354	121,921
Provision for credit losses	11,768	8,136
Net Interest Income After Provision for Credit Losses	128,586	113,785
Non-Interest Income
Service charges	21,276	15,817
Trust fees	5,282	5,161
Insurance commissions and fees	4,921	4,369
Securities commissions and fees	3,374	3,057
Net securities gains (losses)	71	(9)
Mortgage banking operations	1,595	1,799
Bank owned life insurance	2,062	1,843
Other	7,463	6,145
Total Non-Interest Income	46,044	38,182
Non-Interest Expense
Salaries and employee benefits	56,425	49,269
Net occupancy	9,266	8,976
Equipment	8,556	7,648
Amortization of intangibles	2,649	2,115
Outside services	9,303	8,777
FDIC insurance	3,968	3,689
Merger and acquisition related	24,940
Other	21,541	14,181
Total Non-Interest Expense	136,648	94,655
Income Before Income Taxes	37,982	57,312
Income taxes	11,850	16,969
Net Income	26,132	40,343
Less: Preferred stock dividends	2,010	2,010
Net Income Available to Common Stockholders	$ 24,122	$ 38,333
Net Income per Common Share - Basic	$ 0.12	$ 0.22
Net Income per Common Share - Diluted	0.12	0.22
Cash Dividends per Common Share	$ 0.12	$ 0.12
Comprehensive income	$ 43,614	$ 51,366

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, 2014	$ 2,021,456	$ 106,882	$ 1,754	$ 1,798,984	$ 176,120	$ (46,003)	$ (16,281)
Comprehensive income	51,366				40,343	11,023
Dividends declared:
Preferred stock	(2,010)				(2,010)
Common stock: $0.12/share	(20,992)				(20,992)
Issuance of common stock	4,435		9	5,986			(1,560)
Restricted stock compensation	340			340
Tax benefit of stock-based compensation	681			681
Balance at Mar. 31, 2015	2,055,276	106,882	1,763	1,805,991	193,461	(34,980)	(17,841)
Balance at Dec. 31, 2015	2,096,182	106,882	1,766	1,808,210	243,217	(51,133)	(12,760)
Comprehensive income	43,614				26,132	17,482
Dividends declared:
Preferred stock	(2,010)				(2,010)
Common stock: $0.12/share	(25,294)				(25,294)
Issuance of common stock	96		5	1,657			(1,566)
Issuance of common stock-acquisitions	404,020		341	403,679
Restricted stock compensation	1,136			1,136
Tax benefit of stock-based compensation	277			277
Balance at Mar. 31, 2016	$ 2,518,021	$ 106,882	$ 2,112	$ 2,214,959	$ 242,045	$ (33,651)	$ (14,326)

Consolidated Statements of Sto6

Consolidated Statements of Stockholders' Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Stockholders' Equity [Abstract]
Common stock dividends per share	$ 0.12	$ 0.12

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Operating Activities
Net income	$ 26,132	$ 40,343
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation, amortization and accretion	11,759	11,725
Provision for credit losses	11,768	8,136
Deferred tax expense	255	3,217
Net securities (gains) losses	(71)	9
Tax benefit of stock-based compensation	(277)	(681)
Loans originated for sale	(95,503)	(71,499)
Loans sold	94,765	74,870
Gain on sale of loans	(2,164)	(1,813)
Net change in:
Interest receivable	(109)	(1,704)
Interest payable	1,301	(178)
Bank owned life insurance	(1,850)	(1,323)
Other, net	47,865	5,187
Net cash flows provided by operating activities	93,871	66,289
Investing Activities
Net change in loans and leases	(122,982)	(167,685)
Securities available for sale:
Purchases	(510,271)	(90,156)
Sales	615,199	33,228
Maturities	170,266	66,275
Securities held to maturity:
Purchases	(217,574)	(130,506)
Sales		69,394
Maturities	77,369
Purchase of bank owned life insurance	(64)	(8)
Increase in premises and equipment	(13,878)	(6,199)
Net cash received in business combinations	46,854
Net cash flows provided by (used in) investing activities	44,919	(225,657)
Financing Activities
Demand (non-interest bearing and interest bearing) and savings accounts	411,857	445,685
Time deposits	28,558	(20,779)
Short-term borrowings	(687,409)	(301,158)
Increase in long-term borrowings	42,371	6,598
Decrease in long-term borrowings	(51,546)	(6,579)
Net proceeds from issuance of common stock	1,232	4,775
Tax benefit of stock-based compensation	277	681
Cash dividends paid:
Preferred stock	(2,010)	(2,010)
Common stock	(25,294)	(20,992)
Net cash flows (used in) provided by financing activities	(281,964)	106,221
Net Decrease in Cash and Cash Equivalents	(143,174)	(53,147)
Cash and cash equivalents at beginning of period	489,119	287,393
Cash and Cash Equivalents at End of Period	$ 345,945	$ 234,246

Summary of Significant Accounti

Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2016
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Basis of Presentation The Corporation’s accompanying consolidated financial statements and these notes to the financial statements include subsidiaries in which the Corporation has a controlling financial interest. The Corporation owns and operates FNBPA, First National Trust Company, First National Investment Services Company, LLC, F.N.B. Investment Advisors, Inc., First National Insurance Agency, LLC, Regency, 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 26, 2016. 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, fair value measurements and income taxes. Business Combinations Business combinations are accounted for by applying the acquisition method in accordance with Accounting Standards Codification (ASC) 805, Business Combinations. Cloud Computing Arrangements Beginning in 2016, for new or materially modified contracts, the Corporation prospectively adopted new accounting principles to evaluate fees paid for cloud computing arrangements to determine if those arrangements include the purchase of or license to software that should be accounted for separately as internal-use software. If a contract includes the purchase or license to software that should be accounted for separately as internal-use software, the contract is amortized over the software’s identified useful life in amortization of intangibles. For contracts that do not include a software license, the contract is accounted for as a service contract with fees paid recorded in other non-interest expense. Stock Based Compensation The Corporation accounts for its stock based compensation awards in accordance with Accounting Standards Codification (ASC) 718, Compensation—Stock Compensation, ASC 718 requires companies to estimate the fair value of share-based awards on the date of grant. The value of the portion of the award that is ultimately expected to vest is recognized as expense in the Corporation’s consolidated statement of comprehensive income over the shorter of requisite service periods or the period through the date that the employee first becomes eligible to retire. Some of the Corporation’s plans contain performance targets that affect vesting and can be achieved after the requisite service period and accounted for as a performance condition. Beginning in 2016, the performance target is not reflected in the estimation of the award’s grant date fair value and compensation cost is recognized in the period in which it becomes probable that the performance condition will be achieved. Because share-based compensation expense is based on awards that are ultimately expected to vest, share-based compensation expense has been reduced to account for estimated forfeitures. Forfeitures are estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates. Variable Interest Entities The Corporation has investments in certain partnerships and limited liability entities that qualify as variable interest entities (VIEs). These entities are evaluated on an on-going basis to determine whether they should be consolidated. Consolidation of a VIE is appropriate if a reporting entity holds a controlling financial interest in the VIE. The Corporation has determined that it does not hold a controlling financial interest in any of the VIEs and, therefore, the assets and liabilities of these entities are not consolidated into its financial statements. Instead, investments in these entities are accounted for under the equity method of accounting and are evaluated periodically for impairment. The recorded investment in these entities is reported in other assets on the consolidated balance sheets.

New Accounting Standards

New Accounting Standards	3 Months Ended
	Mar. 31, 2016
Accounting Changes and Error Corrections [Abstract]
New Accounting Standards	2. NEW ACCOUNTING STANDARDS The following paragraphs summarize accounting pronouncements applicable to the Corporation that have been issued by the Financial Accounting Standards Board (FASB) but are not yet effective. Revenue Recognition Accounting Standards Update (ASU or Update) 2016-10, Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing, ASU 2016-08, Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations (Reporting Revenue Gross versus Net), ASU 2014-09, Revenue from Contracts with Customers (Topic 606), The guidance for these Revenue Recognition Updates is effective for annual periods beginning in the first quarter of 2018. Early application is permitted beginning in the first quarter of 2017. The Corporation is currently assessing the potential impact to its Consolidated Financial Statements. Stock Based Compensation ASU 2016-09, Compensation—Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting, Investments ASU 2016-07, Investments—Equity Method and Joint Ventures (Topic 323): Simplifying the Transition to the Equity Method of Accounting, Derivative and Hedging Activities ASU 2016-06, Derivatives and Hedging (Topic 815): Contingent Put and Call Options in Debt Instruments (a consensus of the Emerging Issues Task Force), ASU 2016-05, Derivatives and Hedging (Topic 815): Effect of Derivative Contract Novations on Existing Hedge Accounting Relationships (a consensus of the Emerging Issues Task Force), Extinguishments of Liabilities ASU 2016-04, Liabilities—Extinguishments of Liabilities (Subtopic 405-20): Recognition of Breakage for Certain Prepaid Stored-Value Products (a consensus of the Emerging Issues Task Force), Leases ASU 2016-02, Leases (Topic 842), Financial Instruments – Recognition and Measurement ASU 2016-01, Financial Instruments—Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities,

Mergers and Acquisitions

Mergers and Acquisitions	3 Months Ended
	Mar. 31, 2016
Business Combinations [Abstract]
Mergers and Acquisitions	3. MERGERS AND ACQUISITIONS Branch Purchase – Fifth Third Bank On April 22, 2016, the Corporation completed its purchase of 17 branch-banking locations and related consumer loans in the Pittsburgh, Pennsylvania metropolitan area from Fifth Third Bank, in which the Corporation acquired approximately $99,500 in loans and $302,000 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 April 22, 2016, and the related results of operation 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 $10,798 in goodwill and $5,200 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. Metro Bancorp, Inc. On February 13, 2016, the Corporation completed its acquisition of Metro Bancorp, Inc. (METR), a bank holding company based in Harrisburg, Pennsylvania. The acquisition will enhance the Corporation’s distribution and scale across Central Pennsylvania, strengthen its position as the largest Pennsylvania-based regional bank and allow the Corporation to leverage the significant infrastructure investments made in connection with the expansion of its product offerings and risk management systems. On the acquisition date, the estimated fair values of METR included $2,797,199 in assets, $1,869,046 in loans and $2,327,219 in deposits. The acquisition was valued at $404,020 and resulted in the Corporation issuing 34,041,181 shares of its common stock in exchange for 14,345,319 shares of METR common stock. The Corporation also acquired the fully vested outstanding stock options of METR. The assets and liabilities of METR were recorded on the Corporation’s consolidated balance sheet at their preliminary estimated fair values as of February 13, 2016, the acquisition date, and METR’s results of operations have been included in the Corporation’s consolidated statement of comprehensive income since that date. METR’s banking affiliate, Metro Bank, was merged into FNBPA on February 13, 2016. Based on the preliminary purchase price allocation, the Corporation recorded $173,848 in goodwill and $36,801 in core deposit intangibles as a result of the acquisition. These fair value estimates are provisional amounts based on third party valuations that are currently under review. None of the goodwill is deductible for income tax purposes. The following pro forma financial information for the three months ended March 31, 2015 reflects the Corporation’s estimated consolidated pro forma results of operations as if the METR acquisition occurred on January 1, 2015, unadjusted for potential cost savings and other business synergies the Corporation expects to receive as a result of the acquisition: F.N.B. METR Pro Forma Pro Forma Revenue (net interest income and non-interest income) $ 160,103 $ 33,626 $ (1,061 ) $ 192,668 Net income 40,343 5,722 (2,003 ) 44,062 Net income available to common stockholders 38,333 5,702 (1,983 ) 42,052 Earnings per common share – basic 0.22 0.40 — 0.20 Earnings per common share – diluted 0.22 0.39 — 0.20 The pro forma adjustments reflect amortization and associated taxes related to the purchase accounting adjustments made to record various acquired items at fair value. In connection with the METR acquisition, the Corporation incurred expenses related to systems conversions and other costs of integrating and conforming acquired operations with and into the Corporation. These merger-related charges amounted to $24,577 and were expensed as incurred. Severance costs comprised 50.9% of the merger-related expenses, with the remainder consisting of other non-interest expenses, including professional services, marketing and advertising, technology and communications, occupancy and equipment, and charitable contributions. The Corporation also incurred issuance costs of $743 which were charged to additional paid-in capital. Branch Purchase – Bank of America On September 18, 2015, the Corporation completed its purchase of five branch-banking locations in southeastern Pennsylvania from Bank of America (BofA). The fair value of the acquired assets totaled $154,619, including $148,159 in cash, $4,485 in goodwill and intangible assets, and $1,975 in fixed and other assets. The Corporation also assumed $154,619 in deposits associated with these branches. The Corporation paid a deposit premium of 1.94% and acquired an immaterial amount of loans as part of the transaction. The Corporation’s operating results for 2015 include the impact of branch activity subsequent to the September 18, 2015 closing date. Goodwill of $1,485 for this transaction is deductible for income tax purposes. The following table summarizes the amounts recorded on the consolidated balance sheet as of each of the acquisition dates in conjunction with the METR acquisition and the BofA branch acquisition discussed above: METR BofA Branches Fair value of consideration paid $ 404,020 $ — Fair value of identifiable assets acquired: Cash and cash equivalents 46,854 148,159 Securities 722,980 — Loans 1,869,046 842 Other intangible assets 36,801 3,000 Other assets 121,518 1,133 Total identifiable assets acquired 2,797,199 153,134 Fair value of liabilities assumed: Deposits 2,327,219 154,619 Borrowings 227,539 — Other liabilities 12,269 — Total liabilities assumed 2,567,027 154,619 Fair value of net identifiable assets acquired 230,172 (1,485 ) Goodwill recognized (1) $ 173,848 $ 1,485 (1) All of the goodwill for both of these transactions has been recorded by FNBPA.

Securities

Securities	3 Months Ended
	Mar. 31, 2016
Investments, Debt and Equity Securities [Abstract]
Securities	4. SECURITIES The amortized cost and fair value of securities are as follows: Amortized Cost Gross Gross Fair Value Securities Available for Sale March 31, 2016 U.S. Treasury $ 29,771 $ 223 $ — $ 29,994 U.S. government-sponsored entities 398,497 2,617 (36 ) 401,078 Residential mortgage-backed securities: Agency mortgage-backed securities 1,075,195 12,691 (21 ) 1,087,865 Agency collateralized mortgage obligations 524,722 3,812 (2,904 ) 525,630 Non-agency collateralized mortgage obligations 1,111 — (15 ) 1,096 Commercial mortgage-backed securities 3,674 — (1 ) 3,673 States of the U.S. and political subdivisions 39,620 283 (99 ) 39,804 Other debt securities 9,754 177 (1,023 ) 8,908 Total debt securities 2,082,344 19,803 (4,099 ) 2,098,048 Equity securities 975 320 — 1,295 $ 2,083,319 $ 20,123 $ (4,099 ) $ 2,099,343 December 31, 2015 U.S. Treasury $ 29,738 $ 58 $ — $ 29,796 U.S. government-sponsored entities 368,463 856 (1,325 ) 367,994 Residential mortgage-backed securities: Agency mortgage-backed securities 703,069 4,594 (2,832 ) 704,831 Agency collateralized mortgage obligations 503,328 1,032 (8,530 ) 495,830 Non-agency collateralized mortgage obligations 1,177 13 — 1,190 Commercial mortgage-backed securities 4,299 — (12 ) 4,287 States of the U.S. and political subdivisions 10,748 309 — 11,057 Other debt securities 14,729 208 (651 ) 14,286 Total debt securities 1,635,551 7,070 (13,350 ) 1,629,271 Equity securities 975 324 (3 ) 1,296 $ 1,636,526 $ 7,394 $ (13,353 ) $ 1,630,567 Securities Held to Maturity March 31, 2016 U.S. Treasury $ 500 $ 184 $ — $ 684 U.S. government-sponsored entities 122,333 1,606 — 123,939 Residential mortgage-backed securities: Agency mortgage-backed securities 830,640 18,063 (4 ) 848,699 Agency collateralized mortgage obligations 520,576 4,123 (2,931 ) 521,768 Non-agency collateralized mortgage obligations 2,436 4 (9 ) 2,431 Commercial mortgage-backed securities 50,526 1,222 (92 ) 51,656 States of the U.S. and political subdivisions 249,009 5,441 (174 ) 254,276 $ 1,776,020 $ 30,643 $ (3,210 ) $ 1,803,453 December 31, 2015 U.S. Treasury $ 500 $ 153 $ — $ 653 U.S. government-sponsored entities 137,385 809 (395 ) 137,799 Residential mortgage-backed securities: Agency mortgage-backed securities 709,970 9,858 (1,176 ) 718,652 Agency collateralized mortgage obligations 499,694 803 (7,657 ) 492,840 Non-agency collateralized mortgage obligations 2,681 14 — 2,695 Commercial mortgage-backed securities 51,258 115 (259 ) 51,114 States of the U.S. and political subdivisions 235,573 4,191 (101 ) 239,663 $ 1,637,061 $ 15,943 $ (9,588 ) $ 1,643,416 The increase in securities in 2016 primarily relates to the METR acquisition completed on February 13, 2016. Gross gains and gross losses were realized on securities as follows: Three Months Ended March 31, 2016 2015 Gross gains $ 71 $ — Gross losses — (9 ) $ 71 $ (9 ) As of March 31, 2016, 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 $ 179 $ 180 $ 12,126 $ 12,140 Due from one to five years 441,067 444,025 114,319 115,578 Due from five to ten years 29,112 29,332 53,587 54,986 Due after ten years 7,284 6,247 191,810 196,195 477,642 479,784 371,842 378,899 Residential mortgage-backed securities: Agency mortgage-backed securities 1,075,195 1,087,865 830,640 848,699 Agency collateralized mortgage obligations 524,722 525,630 520,576 521,768 Non-agency collateralized mortgage obligations 1,111 1,096 2,436 2,431 Commercial mortgage-backed securities 3,674 3,673 50,526 51,656 Equity securities 975 1,295 — — $ 2,083,319 $ 2,099,343 $ 1,776,020 $ 1,803,453 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 March 31, 2016 and December 31, 2015, securities with a carrying value of $2,472,531 and $1,728,939, respectively, were pledged to secure public deposits, trust deposits and for other purposes as required by law. Securities with a carrying value of $361,338 and $272,629 at March 31, 2016 and December 31, 2015, respectively, were pledged as collateral for short-term borrowings. In total, 73.1% of securities as of March 31, 2016 were pledged for purposes as stated above, compared to 61.3% as of December 31, 2015. 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 Unrealized # Fair Value Unrealized Securities Available for Sale March 31, 2016 U.S. government-sponsored entities 2 $ 17,960 $ (36 ) — $ — $ — 2 $ 17,960 $ (36 ) Residential mortgage-backed securities: Agency mortgage-backed securities 2 56,402 (21 ) — — — 2 56,402 (21 ) Agency collateralized mortgage obligations 2 29,786 (28 ) 15 175,354 (2,876 ) 17 205,140 (2,904 ) Non-agency collateralized mortgage obligations 1 1,091 (15 ) — — — 1 1,091 (15 ) Commercial mortgage-backed securities 1 3,673 (1 ) — — — 1 3,673 (1 ) States of the U.S. and political subdivisions 16 21,325 (99 ) — — — 16 21,325 (99 ) Other debt securities — — — 3 3,875 (1,023 ) 3 3,875 (1,023 ) 24 $ 130,237 $ (200 ) 18 $ 179,229 $ (3,899 ) 42 $ 309,466 $ (4,099 ) December 31, 2015 U.S. government-sponsored entities 6 $ 99,131 $ (814 ) 2 $ 34,487 $ (511 ) 8 $ 133,618 $ (1,325 ) Residential mortgage-backed securities: Agency mortgage-backed securities 19 359,250 (2,832 ) — — — 19 359,250 (2,832 ) Agency collateralized mortgage obligations 9 126,309 (1,366 ) 18 215,330 (7,164 ) 27 341,639 (8,530 ) Commercial mortgage-backed securities 1 4,287 (12 ) — — — 1 4,287 (12 ) Other debt securities — — — 3 4,245 (651 ) 3 4,245 (651 ) Equity securities 1 632 (3 ) — — — 1 632 (3 ) 36 $ 589,609 $ (5,027 ) 23 $ 254,062 $ (8,326 ) 59 $ 843,671 $ (13,353 ) Securities Held to Maturity March 31, 2016 Residential mortgage-backed securities: Agency mortgage-backed securities 1 $ 922 (4 ) — $ — — 1 $ 922 $ (4 ) Agency collateralized mortgage obligations — — — 16 181,913 (2,931 ) 16 181,913 (2,931 ) Non-agency collateralized mortgage obligations 2 1,294 (9 ) — — — 2 1,294 (9 ) Commercial mortgage-backed securities 1 8,579 (92 ) — — — 1 8,579 (92 ) States of the U.S. and political subdivisions 5 10,007 (173 ) 1 2,055 (1 ) 6 12,062 (174 ) 9 $ 20,802 $ (278 ) 17 $ 183,968 $ (2,932 ) 26 $ 204,770 $ (3,210 ) December 31, 2015 U.S. government-sponsored entities 3 $ 39,843 $ (173 ) 1 $ 14,778 $ (222 ) 4 $ 54,621 $ (395 ) Residential mortgage-backed securities: Agency mortgage-backed securities 17 212,024 (1,159 ) 1 917 (17 ) 18 212,941 (1,176 ) Agency collateralized mortgage obligations 11 150,593 (1,434 ) 14 160,716 (6,223 ) 25 311,309 (7,657 ) Commercial mortgage-backed securities 3 46,278 (259 ) — — — 3 46,278 (259 ) States of the U.S. and political subdivisions 9 17,616 (101 ) — — — 9 17,616 (101 ) 43 $ 466,354 $ (3,126 ) 16 $ 176,411 $ (6,462 ) 59 $ 642,765 $ (9,588 ) 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. 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: Equities Total For the Three Months Ended March 31, 2016 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 Three Months Ended March 31, 2015 Beginning balance $ 27 $ 27 Loss where impairment was not previously recognized — — Additional loss where impairment was previously recognized — — Reduction due to credit impaired securities sold — — Ending balance $ 27 $ 27 The Corporation did not recognize any impairment losses on securities for the three months ended March 31, 2016 or 2015. States of the U.S. and Political Subdivisions The Corporation’s municipal bond portfolio with a carrying amount of $288,813 as of March 31, 2016 is highly rated with an average entity-specific rating of AA and 97.0% 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 94.8% of the securities are from municipalities located throughout Pennsylvania, Ohio and Maryland. The average holding size of the securities in the municipal bond portfolio is $1,730. In addition to the strong stand-alone ratings, 81.0% of the municipalities have some formal credit enhancement insurance that strengthens the creditworthiness of their issue. Management also reviews the credit profile of each issuer on a quarterly basis.

Loans and Leases

Loans and Leases	3 Months Ended
	Mar. 31, 2016
Receivables [Abstract]
Loans and Leases	5. LOANS AND LEASES Following is a summary of loans and leases, net of unearned income: Originated Loans Acquired Loans Total Loans and March 31, 2016 Commercial real estate $ 3,605,301 $ 1,648,359 $ 5,253,660 Commercial and industrial 2,574,321 471,946 3,046,267 Commercial leases 202,605 — 202,605 Total commercial loans and leases 6,382,227 2,120,305 8,502,532 Direct installment 1,686,037 104,765 1,790,802 Residential mortgages 1,105,680 425,699 1,531,379 Indirect installment 1,025,413 314 1,025,727 Consumer lines of credit 1,034,681 226,812 1,261,493 Other 53,666 — 53,666 $ 11,287,704 $ 2,877,895 $ 14,165,599 Originated Loans Acquired Loans Total Loans and December 31, 2015 Commercial real estate $ 3,531,146 $ 577,910 $ 4,109,056 Commercial and industrial 2,534,351 67,371 2,601,722 Commercial leases 204,553 — 204,553 Total commercial loans and leases 6,270,050 645,281 6,915,331 Direct installment 1,660,717 45,919 1,706,636 Residential mortgages 1,044,689 351,282 1,395,971 Indirect installment 996,175 554 996,729 Consumer lines of credit 1,021,830 115,425 1,137,255 Other 38,518 — 38,518 $ 11,031,979 $ 1,158,461 $ 12,190,440 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 also contains consumer finance loans to individuals in Pennsylvania, Ohio, Tennessee and Kentucky, which totaled $180,889 or 1.3% of total loans and leases at March 31, 2016, compared to $186,162 or 1.5% of total loans and leases at December 31, 2015. Due to the relative size of the consumer finance loan portfolio, these loans are not segregated from other consumer loans. As of March 31, 2016, 38.2% of the commercial real estate loans were owner-occupied, while the remaining 61.8% were non-owner-occupied, compared to 38.1% and 61.9%, respectively, as of December 31, 2015. As of March 31, 2016 and December 31, 2015, the Corporation had commercial construction loans of $458,388 and $352,322, respectively, representing 3.2% and 2.9% 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: March 31, 2016 December 31, Accounted for under ASC 310-30: Outstanding balance $ 2,849,661 $ 1,258,418 Carrying amount 2,485,752 1,011,139 Accounted for under ASC 310-20: Outstanding balance 403,252 146,161 Carrying amount 386,564 140,595 Total acquired loans: Outstanding balance 3,252,913 1,404,579 Carrying amount 2,872,316 1,151,734 The carrying amount of purchased credit impaired loans included in the table above totaled $17,161 at March 31, 2016 and $5,940 at December 31, 2015, 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. Three Months Ended 2016 2015 Balance at beginning of period $ 256,120 $ 331,899 Acquisitions 284,092 — Reduction due to unexpected early payoffs (9,375 ) (11,909 ) Reclass from non-accretable difference 10,494 7,676 Disposals/transfers (260 ) (118 ) Accretion (13,204 ) (16,264 ) Balance at end of period $ 527,867 $ 311,284 The following table reflects amounts at acquisition for all purchased loans subject to ASC 310-30 (impaired and non-impaired) acquired from METR. Acquired Acquired Performing Loans Total Contractually required cash flows at acquisition $ 99,611 $ 2,074,623 $ 2,174,234 Non-accretable difference (expected losses and foregone interest) (52,995 ) (248,666 ) (301,661 ) Cash flows expected to be collected at acquisition 46,616 1,825,957 1,872,573 Accretable yield (1,063 ) (283,029 ) (284,092 ) Basis in acquired loans at acquisition $ 45,553 $ 1,542,928 $ 1,588,481 In addition, loans purchased in the METR acquisition that were not subject to ASC 310-30 had the following balances at the date of acquisition: fair value of $273,966; unpaid principal balance of $296,484; and contractual cash flows not expected to be collected of $98,021. 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 principal and interest is deemed uncollectible, 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: March 31, 2016 December 31, Non-accrual loans $ 63,036 $ 49,897 Troubled debt restructurings 21,453 22,028 Total non-performing loans 84,489 71,925 Other real estate owned (OREO) 50,526 38,918 Total non-performing assets $ 135,015 $ 110,843 Asset quality ratios: Non-performing loans as a percent of total loans and leases 0.60 % 0.59 % Non-performing loans + OREO as a percent of total loans and leases + OREO 0.95 % 0.91 % Non-performing assets as a percent of total assets 0.66 % 0.63 % 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 totaled $4,590 at March 31, 2016 and $5,219 at December 31, 2015. The recorded investment of consumer mortgage loans secured by residential real estate properties for which formal foreclosure proceedings are in process at March 31, 2016 and December 31, 2015 totaled $10,174 and $11,725, respectively. 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 ³ 90 Days Non- Accrual Total Past Due Current Total Loans and Originated Loans and Leases March 31, 2016 Commercial real estate $ 9,342 $ 1 $ 24,083 $ 33,426 $ 3,571,875 $ 3,605,301 Commercial and industrial 4,653 3 24,627 29,283 2,545,038 2,574,321 Commercial leases 1,422 15 894 2,331 200,274 202,605 Total commercial loans and leases 15,417 19 49,604 65,040 6,317,187 6,382,227 Direct installment 6,845 3,463 5,646 15,954 1,670,083 1,686,037 Residential mortgages 7,398 1,545 3,446 12,389 1,093,291 1,105,680 Indirect installment 5,479 369 1,347 7,195 1,018,218 1,025,413 Consumer lines of credit 1,523 661 1,954 4,138 1,030,543 1,034,681 Other 49 63 — 112 53,554 53,666 $ 36,711 $ 6,120 $ 61,997 $ 104,828 $ 11,182,876 $ 11,287,704 December 31, 2015 Commercial real estate $ 11,006 $ 1 $ 23,503 $ 34,510 $ 3,496,636 $ 3,531,146 Commercial and industrial 5,409 3 14,382 19,794 2,514,557 2,534,351 Commercial leases 924 — 659 1,583 202,970 204,553 Total commercial loans and leases 17,339 4 38,544 55,887 6,214,163 6,270,050 Direct installment 9,254 3,813 4,806 17,873 1,642,844 1,660,717 Residential mortgages 8,135 1,470 2,882 12,487 1,032,202 1,044,689 Indirect installment 9,472 379 1,361 11,212 984,963 996,175 Consumer lines of credit 2,410 1,189 1,181 4,780 1,017,050 1,021,830 Other 73 169 — 242 38,276 38,518 $ 46,683 $ 7,024 $ 48,774 $ 102,481 $ 10,929,498 $ 11,031,979 30-89 Days Past Due ³ 90 Days and Still Non- Accrual Total Past Due (1) (2) Current Discount Total Loans Acquired Loans March 31, 2016 Commercial real estate $ 27,329 $ 23,563 $ 740 $ 51,632 $ 1,695,949 $ (99,222 ) $ 1,648,359 Commercial and industrial 1,879 6,596 152 8,627 499,764 (36,445 ) 471,946 Total commercial loans 29,208 30,159 892 60,259 2,195,713 (135,667 ) 2,120,305 Direct installment 2,855 958 — 3,813 97,964 2,988 104,765 Residential mortgages 11,010 15,498 — 26,508 436,528 (37,337 ) 425,699 Indirect installment — 6 — 6 413 (105 ) 314 Consumer lines of credit 1,578 1,292 147 3,017 228,682 (4,887 ) 226,812 $ 44,651 $ 47,913 $ 1,039 $ 93,603 $ 2,959,300 $ (175,008 ) $ 2,877,895 December 31, 2015 Commercial real estate $ 6,399 $ 12,752 $ 931 $ 20,082 $ 593,128 $ (35,300 ) $ 577,910 Commercial and industrial 1,065 616 103 1,784 72,037 (6,450 ) 67,371 Total commercial loans 7,464 13,368 1,034 21,866 665,165 (41,750 ) 645,281 Direct installment 837 659 — 1,496 43,596 827 45,919 Residential mortgages 5,871 15,136 — 21,007 366,742 (36,467 ) 351,282 Indirect installment 32 9 — 41 571 (58 ) 554 Consumer lines of credit 830 546 89 1,465 117,443 (3,483 ) 115,425 $ 15,034 $ 29,718 $ 1,123 $ 45,875 $ 1,193,517 $ (80,931 ) $ 1,158,461 (1) Past due information for acquired loans is based on the contractual balance outstanding at March 31, 2016 and December 31, 2015. (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 Category 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: Originated Commercial Loan and Lease Credit Quality Categories Pass Special Substandard Doubtful Total Originated Loans and Leases March 31, 2016 Commercial real estate $ 3,445,547 $ 97,426 $ 61,928 $ 400 $ 3,605,301 Commercial and industrial 2,346,483 114,408 107,818 5,612 2,574,321 Commercial leases 194,947 3,121 4,537 — 202,605 $ 5,986,977 $ 214,955 $ 174,283 $ 6,012 $ 6,382,227 December 31, 2015 Commercial real estate $ 3,416,527 $ 52,887 $ 61,411 $ 321 $ 3,531,146 Commercial and industrial 2,335,103 109,539 87,380 2,329 2,534,351 Commercial leases 198,207 2,447 3,899 — 204,553 $ 5,949,837 $ 164,873 $ 152,690 $ 2,650 $ 6,270,050 Acquired Loans March 31, 2016 Commercial real estate $ 1,331,863 $ 156,709 $ 152,929 $ 6,858 $ 1,648,359 Commercial and industrial 369,178 23,214 77,897 1,657 471,946 $ 1,701,041 $ 179,923 $ 230,826 $ 8,515 $ 2,120,305 December 31, 2015 Commercial real estate $ 464,162 $ 47,619 $ 66,129 — $ 577,910 Commercial and industrial 56,446 3,182 7,743 — 67,371 $ 520,608 $ 50,801 $ 73,872 — $ 645,281 Credit quality information for acquired loans is based on the contractual balance outstanding at March 31, 2016 and December 31, 2015. The increase in acquired loans in 2016 relates to the METR acquisition completed on February 13, 2016. 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: Originated Consumer Loan Credit Quality by Payment Status Performing Non- Performing Total March 31, 2016 Direct installment $ 1,671,896 $ 14,141 $ 1,686,037 Residential mortgages 1,092,329 13,351 1,105,680 Indirect installment 1,023,909 1,504 1,025,413 Consumer lines of credit 1,031,798 2,883 1,034,681 Other 53,666 — 53,666 $ 4,873,598 $ 31,879 $ 4,905,477 Originated Consumer Loan Credit Quality by Payment Status Performing Non- Performing Total December 31, 2015 Direct installment $ 1,646,925 $ 13,792 $ 1,660,717 Residential mortgages 1,031,926 12,763 1,044,689 Indirect installment 994,661 1,514 996,175 Consumer lines of credit 1,019,783 2,047 1,021,830 Other 38,518 — 38,518 $ 4,731,813 $ 30,116 $ 4,761,929 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 Investment Reserve Recorded Investment Specific Reserve Total Recorded Investment Specific Average Recorded Investment At or for the Three Months Ended March 31, 2016 Commercial real estate $ 33,434 $ 24,035 $ 1,520 $ 25,555 $ 400 $ 25,374 Commercial and industrial 25,965 12,042 12,479 24,521 5,612 19,620 Commercial leases 894 894 — 894 — — Total commercial loans and leases 60,293 36,971 13,999 50,970 6,012 44,994 Direct installment 15,135 14,141 — 14,141 — 13,966 Residential mortgages 13,881 13,351 — 13,351 — 13,058 Indirect installment 3,667 1,504 — 1,504 — 1,509 Consumer lines of credit 3,436 2,883 — 2,883 — 2,465 $ 96,412 $ 68,850 $ 13,999 $ 82,849 $ 6,012 $ 75,992 At or for the Year Ended December 31, 2015 Commercial real estate $ 33,780 $ 24,423 $ 772 $ 25,195 $ 321 $ 26,143 Commercial and industrial 15,860 9,176 5,543 14,719 2,329 12,298 Commercial leases 659 659 — 659 — 747 Total commercial loans and leases 50,299 34,258 6,315 40,573 2,650 39,188 Direct installment 14,679 13,792 — 13,792 — 13,267 Residential mortgages 13,394 12,763 — 12,763 — 12,896 Indirect installment 3,745 1,514 — 1,514 — 1,401 Consumer lines of credit 2,408 2,047 — 2,047 — 2,198 $ 84,525 $ 64,374 $ 6,315 $ 70,689 $ 2,650 $ 68,950 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 $2,821; commercial and industrial of $499; direct installment of $1,322; residential mortgages of $487; indirect installment of $222; and consumer lines of credit of $229, totaling $5,580 at March 31, 2016 and commercial real estate of $3,073; commercial and industrial of $695; direct installment of $1,557; residential mortgages of $659; indirect installment of $221; and consumer lines of credit of $522, totaling $6,727 at December 31, 2015. 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: March 31, 2016 December 31, Accruing: Performing $ 16,508 $ 15,165 Non-performing 21,453 22,028 Non-accrual 11,953 8,307 $ 49,914 $ 45,500 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 three months ended March 31, 2016, the Corporation returned to performing status $2,488 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 $298 and $300 at March 31, 2016 and December 31, 2015, respectively, and pooled reserves for individual loans under $500 of $865 and $929 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 $3,405 and $3,515 at March 31, 2016 and December 31, 2015, 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 March 31, 2016 Three Months Ended March 31, 2015 Number of Contracts Pre- Modification Recorded Investment Post- Outstanding Recorded Investment Number of Contracts Pre- Modification Recorded Investment Post- Outstanding Recorded Investment Commercial real estate 4 $ 778 $ 760 2 $ 312 $ 196 Commercial and industrial 2 5,565 3,279 — — — Total commercial loans 6 6,343 4,039 2 312 196 Direct installment 145 1,991 1,961 131 1,526 1,484 Residential mortgages 18 968 951 14 581 631 Indirect installment 3 11 12 5 16 16 Consumer lines of credit 20 243 238 16 270 270 192 $ 9,556 $ 7,201 168 $ 2,705 $ 2,597 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 March 31, 2016 (1) Three Months Ended March 31, 2015 (1) Number of Contracts Recorded Investment Number of Contracts Recorded Investment Commercial real estate — $ — — $ — Commercial and industrial — — — — Total commercial loans — — — — Direct installment 28 175 37 105 Residential mortgages 1 50 2 102 Indirect installment 4 5 3 4 Consumer lines of credit 1 10 1 92 34 $ 240 43 $ 303 (1) The recorded investment is as of period end. 6. ALLOWANCE FOR CREDIT LOSSES The allowance for credit losses addresses credit losses inherent in the existing loan and lease portfolio and is presented as a reserve against loans and leases on the consolidated balance sheet. Loan and lease losses are charged off against the allowance for credit losses, with recoveries of amounts previously charged off credited to the allowance for credit losses. Provisions for credit losses are charged to operations based on management’s periodic evaluation of the adequacy of 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 Charge- Recoveries Net Charge- Provision Balance at End of Three Months Ended March 31, 2016 Commercial real estate $ 41,741 $ (1,369 ) $ 597 $ (772 ) $ 2,929 $ 43,898 Commercial and industrial 41,023 (298 ) 190 (108 ) 6,948 47,863 Commercial leases 2,541 (114 ) 14 (100 ) 377 2,818 Total commercial loans and leases 85,305 (1,781 ) 801 (980 ) 10,254 94,579 Direct installment 21,587 (2,667 ) 454 (2,213 ) 1,351 20,725 Residential mortgages 7,909 (85 ) 19 (66 ) (33 ) 7,810 Indirect installment 9,889 (1,942 ) 262 (1,680 ) 856 9,065 Consumer lines of credit 9,582 (474 ) 56 (418 ) (197 ) 8,967 Other 1,013 (554 ) 6 (548 ) 609 1,074 Total allowance on originated loans and leases 135,285 (7,503 ) 1,598 (5,905 ) 12,840 142,220 Purchased credit-impaired loans 834 (160 ) — (160 ) 30 704 Other acquired loans 5,893 (221 ) 306 85 (1,102 ) 4,876 Total allowance on acquired loans 6,727 (381 ) 306 (75 ) (1,072 ) 5,580 Total allowance $ 142,012 $ (7,884 ) $ 1,904 $ (5,980 ) $ 11,768 $ 147,800 Three Months Ended March 31, 2015 Commercial real estate $ 37,588 $ (1,001 ) $ 209 $ (792 ) $ 1,996 $ 38,792 Commercial and industrial 32,645 (684 ) 120 (564 ) 722 32,803 Commercial leases 2,398 (93 ) 10 (83 ) 261 2,576 Total commercial loans and leases 72,631 (1,778 ) 339 (1,439 ) 2,979 74,171 Direct installment 20,538 (2,433 ) 269 (2,164 ) 2,830 21,204 Residential mortgages 8,024 (511 ) 15 (496 ) 943 8,471 Indirect installment 7,504 (1,280 ) 302 (978 ) 1,131 7,657 Consumer lines of credit 8,496 (410 ) 40 (370 ) 764 8,890 Other 759 (335 ) 11 (324 ) 419 854 Total allowance on originated loans and leases 117,952 (6,747 ) 976 (5,771 ) 9,066 121,247 Purchased credit-impaired loans 660 (64 ) 19 (45 ) 6 621 Other acquired loans 7,314 (77 ) 330 253 (936 ) 6,631 Total allowance on acquired loans 7,974 (141 ) 349 208 (930 ) 7,252 Total allowance $ 125,926 $ (6,888 ) $ 1,325 $ (5,563 ) $ 8,136 $ 128,499 Following is a summary of the individual and collective originated allowance for credit losses and corresponding loan and lease balances by class: Originated Allowance Originated Loans and Leases Outstanding Individually Evaluated for Impairment Collectively Evaluated for Impairment Loans and Individually Evaluated for Impairment Collectively Evaluated for Impairment March 31, 2016 Commercial real estate $ 400 $ 43,498 $ 3,605,301 $ 14,260 $ 3,591,041 Commercial and industrial 5,612 42,251 2,574,321 19,679 2,554,642 Commercial leases — 2,818 202,605 — 202,605 Total commercial loans and leases 6,012 88,567 6,382,227 33,939 6,348,288 Direct installment — 20,725 1,686,037 — 1,686,037 Residential mortgages — 7,810 1,105,680 — 1,105,680 Indirect installment — 9,065 1,025,413 — 1,025,413 Consumer lines of credit — 8,967 1,034,681 — 1,034,681 Other — 1,074 53,666 — 53,666 $ 6,012 $ 136,208 $ 11,287,704 $ 33,939 $ 11,253,765 December 31, 2015 Commercial real estate $ 321 $ 41,420 $ 3,531,146 $ 12,904 $ 3,518,242 Commercial and industrial 2,329 38,694 2,534,351 10,802 2,523,549 Commercial leases — 2,541 204,553 — 204,553 Total commercial loans and leases 2,650 82,655 6,270,050 23,706 6,246,344 Direct installment — 21,587 1,660,717 — 1,660,717 Residential mortgages — 7,909 1,044,689 — 1,044,689 Indirect installment — 9,889 996,175 — 996,175 Consumer lines of credit — 9,582 1,021,830 — 1,021,830 Other — 1,013 38,518 — 38,518 $ 2,650 $ 132,635 $ 11,031,979 $ 23,706 $ 11,008,273

Allowance for Credit Losses

Allowance for Credit Losses	3 Months Ended
	Mar. 31, 2016
Receivables [Abstract]
Allowance for Credit Losses	6. ALLOWANCE FOR CREDIT LOSSES The allowance for credit losses addresses credit losses inherent in the existing loan and lease portfolio and is presented as a reserve against loans and leases on the consolidated balance sheet. Loan and lease losses are charged off against the allowance for credit losses, with recoveries of amounts previously charged off credited to the allowance for credit losses. Provisions for credit losses are charged to operations based on management’s periodic evaluation of the adequacy of 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 Charge- Recoveries Net Charge- Provision Balance at End of Three Months Ended March 31, 2016 Commercial real estate $ 41,741 $ (1,369 ) $ 597 $ (772 ) $ 2,929 $ 43,898 Commercial and industrial 41,023 (298 ) 190 (108 ) 6,948 47,863 Commercial leases 2,541 (114 ) 14 (100 ) 377 2,818 Total commercial loans and leases 85,305 (1,781 ) 801 (980 ) 10,254 94,579 Direct installment 21,587 (2,667 ) 454 (2,213 ) 1,351 20,725 Residential mortgages 7,909 (85 ) 19 (66 ) (33 ) 7,810 Indirect installment 9,889 (1,942 ) 262 (1,680 ) 856 9,065 Consumer lines of credit 9,582 (474 ) 56 (418 ) (197 ) 8,967 Other 1,013 (554 ) 6 (548 ) 609 1,074 Total allowance on originated loans and leases 135,285 (7,503 ) 1,598 (5,905 ) 12,840 142,220 Purchased credit-impaired loans 834 (160 ) — (160 ) 30 704 Other acquired loans 5,893 (221 ) 306 85 (1,102 ) 4,876 Total allowance on acquired loans 6,727 (381 ) 306 (75 ) (1,072 ) 5,580 Total allowance $ 142,012 $ (7,884 ) $ 1,904 $ (5,980 ) $ 11,768 $ 147,800 Three Months Ended March 31, 2015 Commercial real estate $ 37,588 $ (1,001 ) $ 209 $ (792 ) $ 1,996 $ 38,792 Commercial and industrial 32,645 (684 ) 120 (564 ) 722 32,803 Commercial leases 2,398 (93 ) 10 (83 ) 261 2,576 Total commercial loans and leases 72,631 (1,778 ) 339 (1,439 ) 2,979 74,171 Direct installment 20,538 (2,433 ) 269 (2,164 ) 2,830 21,204 Residential mortgages 8,024 (511 ) 15 (496 ) 943 8,471 Indirect installment 7,504 (1,280 ) 302 (978 ) 1,131 7,657 Consumer lines of credit 8,496 (410 ) 40 (370 ) 764 8,890 Other 759 (335 ) 11 (324 ) 419 854 Total allowance on originated loans and leases 117,952 (6,747 ) 976 (5,771 ) 9,066 121,247 Purchased credit-impaired loans 660 (64 ) 19 (45 ) 6 621 Other acquired loans 7,314 (77 ) 330 253 (936 ) 6,631 Total allowance on acquired loans 7,974 (141 ) 349 208 (930 ) 7,252 Total allowance $ 125,926 $ (6,888 ) $ 1,325 $ (5,563 ) $ 8,136 $ 128,499 Following is a summary of the individual and collective originated allowance for credit losses and corresponding loan and lease balances by class: Originated Allowance Originated Loans and Leases Outstanding Individually Evaluated for Impairment Collectively Evaluated for Impairment Loans and Individually Evaluated for Impairment Collectively Evaluated for Impairment March 31, 2016 Commercial real estate $ 400 $ 43,498 $ 3,605,301 $ 14,260 $ 3,591,041 Commercial and industrial 5,612 42,251 2,574,321 19,679 2,554,642 Commercial leases — 2,818 202,605 — 202,605 Total commercial loans and leases 6,012 88,567 6,382,227 33,939 6,348,288 Direct installment — 20,725 1,686,037 — 1,686,037 Residential mortgages — 7,810 1,105,680 — 1,105,680 Indirect installment — 9,065 1,025,413 — 1,025,413 Consumer lines of credit — 8,967 1,034,681 — 1,034,681 Other — 1,074 53,666 — 53,666 $ 6,012 $ 136,208 $ 11,287,704 $ 33,939 $ 11,253,765 December 31, 2015 Commercial real estate $ 321 $ 41,420 $ 3,531,146 $ 12,904 $ 3,518,242 Commercial and industrial 2,329 38,694 2,534,351 10,802 2,523,549 Commercial leases — 2,541 204,553 — 204,553 Total commercial loans and leases 2,650 82,655 6,270,050 23,706 6,246,344 Direct installment — 21,587 1,660,717 — 1,660,717 Residential mortgages — 7,909 1,044,689 — 1,044,689 Indirect installment — 9,889 996,175 — 996,175 Consumer lines of credit — 9,582 1,021,830 — 1,021,830 Other — 1,013 38,518 — 38,518 $ 2,650 $ 132,635 $ 11,031,979 $ 23,706 $ 11,008,273

Borrowings

Borrowings	3 Months Ended
	Mar. 31, 2016
Debt Disclosure [Abstract]
Borrowings	7. BORROWINGS Following is a summary of short-term borrowings: March 31, 2016 December 31, Securities sold under repurchase agreements $ 297,562 $ 266,732 Federal Home Loan Bank advances 490,000 1,090,000 Federal funds purchased 652,000 568,000 Subordinated notes 124,326 124,164 $ 1,563,888 $ 2,048,896 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: March 31, 2016 December 31, Federal Home Loan Bank advances $ 425,147 $ 400,017 Subordinated notes 85,206 84,668 Junior subordinated debt 48,572 58,298 Other subordinated debt 98,520 98,497 $ 657,445 $ 641,480 The Corporation’s banking affiliate has available credit with the FHLB of $5,543,082 of which $915,147 was used as of March 31, 2016. 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 three months ended March 31, 2016 and the year ended December 31, 2015. The junior subordinated debt is comprised of debt securities issued by the Corporation in relation to its two unconsolidated subsidiary trusts (collectively, the Trusts): F.N.B. Statutory Trust II and Omega Financial Capital Trust I. One hundred percent of the common equity of each Trust is owned by the Corporation. The Trusts were formed for the purpose of issuing Corporation-obligated mandatorily redeemable capital securities, or trust preferred securities (TPS) to third-party investors. The proceeds from the sale of TPS and the issuance of common equity by the Trusts were invested in junior subordinated debt securities issued by the Corporation, which are the sole assets of each Trust. Since third-party investors are the primary beneficiaries, the Trusts are not consolidated in the Corporation’s financial statements. The Trusts pay dividends on the TPS at the same rate as the distributions paid by the Corporation on the junior subordinated debt held by the Trusts. Omega Financial Capital Trust I was assumed as a result of an acquisition. Distributions on the junior subordinated debt issued to the Trusts are recorded as interest expense by the Corporation. The TPS are subject to mandatory redemption, in whole or in part, upon repayment of the junior subordinated debt. The TPS are eligible for redemption, at any time, at the Corporation’s discretion. Under capital guidelines, beginning in 2016, the entire balance of TPS is included in tier 2 capital. The Corporation has entered into agreements which, when taken collectively, fully and unconditionally guarantee the obligations under the TPS subject to the terms of each of the guarantees. During 2016, the Corporation redeemed $10,000 of the TPS issued by Omega Financial Capital Trust I. The following table provides information relating to the Trusts as of March 31, 2016: Trust Preferred Securities Common Securities Junior Subordinated Debt Stated Maturity Date Interest Rate F.N.B. Statutory Trust II $ 21,500 $ 665 $ 22,165 6/15/36 2.28 % Variable; 3-month LIBOR + 165 basis points (bps) Omega Financial Capital Trust I 26,000 1,114 26,407 10/18/34 2.81 % Variable; 3-month LIBOR + 219 bps $ 47,500 $ 1,779 $ 48,572

Derivative and Hedging Activiti

Derivative and Hedging Activities	3 Months Ended
	Mar. 31, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative and Hedging Activities	8. 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: March 31, 2016 December 31, 2015 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 $ 7,859 $ 1,341 $ 250,000 $ 3,178 $ 962 Interest rate swaps – not designated 1,373,959 — 80,625 1,262,964 1 50,491 Equity contracts – not designated 1,180 34 — 1,180 18 — Total subject to master netting arrangements 1,625,139 7,893 81,966 1,514,144 3,197 51,453 Not subject to master netting arrangements: Interest rate swaps – not designated 1,373,959 80,091 — 1,262,964 49,998 1 Credit risk contracts – not designated 134,204 22 219 114,753 7 133 Equity contracts – not designated 1,180 — 34 1,180 — 18 Total not subject to master netting arrangements 1,509,343 80,113 253 1,378,897 50,005 152 $ 3,134,482 $ 88,006 $ 82,219 $ 2,893,041 $ 53,202 $ 51,605 Derivatives Designated as Hedging Instruments under GAAP Interest Rate Contracts. The notional amount of these interest rate derivative agreements totaled $250,000 at both March 31, 2016 and December 31, 2015. Fair values included in other assets and other liabilities on the consolidated balance sheet applicable to these agreements amounted to $7,859 and $1,341, respectively, at March 31, 2016, and $3,178 and $962, respectively, at December 31, 2015. For the three months ended March 31, 2016, the amount reclassified from accumulated other comprehensive income (AOCI) to interest income and interest expense totaled $687 ($446 net of tax) and $150 ($97 net of tax), respectively. As of March 31, 2016, the maximum length of time over which forecasted interest cash flows are hedged is seven years. In the twelve months that follow March 31, 2016, the Corporation expects to reclassify from the amount currently reported in AOCI net derivative gains of $1,979 ($1,286 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 March 31, 2016. There were no components of derivative gains or losses excluded from the assessment of hedge effectiveness related to these cash flow hedges. For the three months ended March 31, 2016 and 2015, there was no hedge ineffectiveness. Also, during the three months ended March 31, 2016 and 2015, 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 $1,373,959 at March 31, 2016. Fair values included in other assets and other liabilities on the consolidated balance sheet applicable to these agreements amounted to $80,091 and $80,625, respectively, at March 31, 2016. At December 31, 2015, the notional amount of these customer derivative agreements and the offsetting derivative counterparty positions each totaled $1,262,964. At December 31, 2015, fair values included in other assets and other liabilities on the consolidated balance sheet amounted to $49,999 and $50,492, 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 $83,010 as of March 31, 2016 have remaining terms ranging from one to fourteen years. Under these agreements, the Corporation’s maximum exposure assuming a customer defaults on their obligation to perform under certain derivative swap contracts with third parties would be $219 at March 31, 2016 and $133 at December 31, 2015. The fair values of risk participation agreements purchased and sold were not material at March 31, 2016 and December 31, 2015. 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 $1,894 and $1,333 as of March 31, 2016 and December 31, 2015, 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 March 31, 2016 Derivative Assets Subject to master netting arrangements: Interest rate contracts Designated $ 7,859 — $ 7,859 Not designated — — — Equity contracts – not designated 34 — 34 Not subject to master netting arrangements: Interest rate contracts – not designated 80,091 — 80,091 Credit contracts – not designated 22 — 22 $ 88,006 — $ 88,006 Derivative Liabilities Subject to master netting arrangements: Interest rate contracts Designated $ 1,341 — $ 1,341 Not designated 80,625 — 80,625 Not subject to master netting arrangements: Interest rate contracts – not designated — — — Credit contracts – not designated 219 — 219 Equity contracts – not designated 34 — 34 $ 82,219 — $ 82,219 December 31, 2015 Derivative Assets Subject to master netting arrangements: Interest rate contracts Designated $ 3,178 — $ 3,178 Not designated 1 — 1 Equity contracts – not designated 18 — 18 Not subject to master netting arrangements: Interest rate contracts – not designated 49,998 — 49,998 Credit contracts – not designated 7 7 $ 53,202 — $ 53,202 Derivative Liabilities Subject to master netting arrangements: Interest rate contracts Designated $ 962 — $ 962 Not designated 50,491 — 50,491 Not subject to master netting arrangements: Interest rate contracts – not designated 1 — 1 Credit contracts – not designated 133 133 Equity contracts – not designated 18 — 18 $ 51,605 — $ 51,605 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 the Balance Sheet Amount Not Offset in Financial Cash Net Amount March 31, 2016 Derivative Assets Interest rate contracts: Designated $ 7,859 $ 5,052 $ 2,807 — Not designated — — — — Equity contracts – not designated 34 34 — — $ 7,893 $ 5,086 $ 2,807 — Derivative Liabilities Interest rate contracts: Designated $ 1,341 $ — $ 1,341 $ — Not designated 80,625 31,472 47,487 1,666 $ 81,966 $ 31,472 $ 48,828 $ 1,666 December 31, 2015 Derivative Assets Interest rate contracts: Designated $ 3,178 $ 1,516 $ 1,662 — Not designated 1 1 — — Equity contracts – not designated 18 18 — — $ 3,197 $ 1,535 $ 1,662 — Derivative Liabilities Interest rate contracts: Designated $ 962 $ 792 $ 170 $ — Not designated 50,491 24,579 24,632 1,280 $ 51,453 $ 25,371 $ 24,802 $ 1,280 The following table presents the effect of certain of the Corporation’s derivative financial instruments on the income statement: Income Three Months Ended Statement March 31, Location 2016 2015 Interest Rate Contracts Interest income—loans and leases $ 687 $ 809 Interest Rate Contracts Interest expense—short-term borrowings 150 — Interest Rate Swaps Other income (41 ) (107 ) Credit Risk Contracts Other income (71 ) — 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 March 31, 2016 and December 31, 2015 are not material.

Commitments, Credit Risk and Co

Commitments, Credit Risk and Contingencies	3 Months Ended
	Mar. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Commitments, Credit Risk and Contingencies	9. 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: March 31, 2016 December 31, 2015 Commitments to extend credit $ 4,463,138 $ 3,781,719 Standby letters of credit 118,167 92,979 At March 31, 2016, funding of 75.4% 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 recorded as a liability on the Corporation’s balance sheet. In addition, subordinated notes issued by a wholly-owned finance subsidiary of the Corporation are fully and unconditionally guaranteed by the Corporation. Other Legal Proceedings In the ordinary course of business, the Corporation and its subsidiaries are routinely named as defendants in, or made parties to, pending and potential legal actions. Also, as regulated entities, the Corporation and its subsidiaries also are subject to governmental and regulatory examinations, information-gathering requests, investigations and proceedings (both formal and informal). Claims for significant monetary damages may be asserted in many of these type legal actions, while claims for disgorgement, restitution, penalties and/or other remedial actions or sanctions may be sought in regulatory matters. It is inherently difficult to predict the eventual outcomes of such matters given their complexity and the particular facts and circumstances at issue in each of these matters. However, on the basis of current knowledge and understanding, and advice of counsel, the Corporation does not believe that judgments, sanctions, settlements or orders, if any, that may arise from these matters (either individually or in the aggregate, after giving effect to applicable reserves and insurance coverage) will have a material adverse effect on the consolidated financial position or liquidity of the Corporation, although they could have a material effect on net income in a given period. In view of the inherent unpredictability of outcomes in litigation and governmental and regulatory matters, particularly where (i) the damages sought are indeterminate, (ii) the proceedings are in the early stages, or (iii) the matters involve novel legal theories or a large number of parties, as a matter of course, there is considerable uncertainty surrounding the timing or ultimate resolution of litigation and governmental and regulatory matters, including a possible eventual loss, fine, penalty, business or reputational impact, if any, associated with each such matter. In accordance with applicable accounting guidance, the Corporation establishes accruals for litigation and governmental and regulatory matters when those matters proceed to a stage where they present loss contingencies that are both probable and reasonably estimable. In such cases, there may be a possible exposure to loss in excess of any amounts accrued. The Corporation will continue to monitor such matters for developments that could affect the amount of the accrual, and will adjust the accrual amount as appropriate. If the loss contingency in question is not both probable and reasonably estimable, the Corporation does not establish an accrual and the matter will continue to be monitored for any developments that would make the loss contingency both probable and reasonably estimable. The Corporation believes that its accruals for legal proceedings are appropriate and, in the aggregate, are not material to the consolidated financial position of the Corporation, although future accruals could have a material effect on net income in a given period.

Stock Incentive Plans

Stock Incentive Plans	3 Months Ended
	Mar. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Incentive Plans	10. 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. The Corporation did not issue any restricted stock awards for the three months ended March 31, 2016 or 2015. For performance-based restricted stock awards granted, the recipients will earn between 0% and 175% of the number of units issued, based on the Corporation’s total stockholder return relative to a specified peer group of financial institutions over the three-year period. These market-based restricted stock units are included in the table below as if the recipients earned shares equal to 100% of the units issued. As of March 31, 2016, the Corporation had available up to 3,310,508 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 $1,136 and $340 for the three months ended March 31, 2016 and 2015, the tax benefit of which was $398 and $119, respectively. The following table summarizes certain information concerning restricted stock awards: Three Months Ended March 31, 2016 2015 Awards Weighted Average Grant Awards Weighted Average Grant Unvested awards outstanding at beginning of period 1,548,444 $ 12.85 1,354,093 $ 11.86 Net adjustment due to performance — — (46,956 ) 10.25 Vested (363,799 ) 12.07 (458,450 ) 10.60 Forfeited (6,368 ) 12.79 (2,357 ) 17.93 Dividend reinvestment 10,870 11.50 7,656 14.24 Unvested awards outstanding at end of period 1,189,147 13.08 853,986 12.63 The total fair value of awards vested was $4,424 and $5,740 for the three months ended March 31, 2016 and 2015, respectively. As of March 31, 2016, there was $8,097 of unrecognized compensation cost related to unvested restricted stock awards, including $40 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- Based Awards Total Unvested awards 514,702 674,445 1,189,147 Unrecognized compensation expense $ 3,178 $ 4,919 $ 8,097 Intrinsic value $ 6,696 $ 8,775 $ 15,471 Weighted average remaining life (in years) 1.69 2.37 2.08 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 24,806 and 60,094 for the three months ended March 31, 2016 and 2015, respectively. The following table summarizes certain information concerning stock option awards: Three Months Ended March 31, 2016 2015 Shares Weighted Average Exercise Price Shares Weighted Average Exercise Price Options outstanding at beginning of period 435,340 $ 8.86 568,834 $ 8.86 Assumed from acquisitions 1,707,036 7.83 — — Exercised (24,806 ) 6.38 (60,094 ) 5.04 Forfeited (92,650 ) 6.69 (2,182 ) 4.34 Options outstanding and exercisable at end of period 2,024,920 8.12 506,558 9.33 The intrinsic value of outstanding and exercisable stock options at March 31, 2016 was $10,045. 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 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 380,390, with a resulting lower exercise price of $3.21 per share as of March 31, 2016. 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	3 Months Ended
	Mar. 31, 2016
Compensation and Retirement Disclosure [Abstract]
Retirement Plans	11. 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 March 31, 2016 2015 Service cost $ (4 ) $ 17 Interest cost 1,544 1,477 Expected return on plan assets (2,353 ) (2,491 ) Amortization: Unrecognized prior service cost 2 2 Unrecognized loss 608 536 Net periodic pension credit $ (203 ) $ (459 ) 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. The Corporation’s contribution expense was $2,462 and $2,167 for the three months ended March 31, 2016 and 2015, 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.

Comprehensive Income

Comprehensive Income	3 Months Ended
	Mar. 31, 2016
Equity [Abstract]
Comprehensive Income	12. COMPREHENSIVE INCOME The components of comprehensive income, net of related tax, are as follows: Three Months Ended March 31, 2016 2015 Net income $ 26,132 $ 40,343 Other comprehensive income: Securities available for sale: Unrealized gains arising during the period, net of tax expense of $7,719 and $4,523 14,335 8,400 Reclassification adjustment for (gains) losses included in net income, net of tax expense of $25 and $(3) (46 ) 6 Derivative instruments: Unrealized gains arising during the period, net of tax expense of $1,693 and $1,504 3,145 2,793 Reclassification adjustment for gains included in net income, net of tax expense of $188 and $283 (349 ) (526 ) Pension and postretirement benefit obligations: Unrealized gains arising during the period, net of tax expense of $214 and $189 397 350 Other comprehensive income 17,482 11,023 Comprehensive income $ 43,614 $ 51,366 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 Three Months Ended March 31, 2016 Balance at beginning of period $ (3,873 ) $ 1,440 $ (48,700 ) $ (51,133 ) Other comprehensive income before reclassifications 14,335 3,145 397 17,877 Amounts reclassified from AOCI (46 ) (349 ) — (395 ) Net current period other comprehensive income 14,289 2,796 397 17,482 Balance at end of period $ 10,416 $ 4,236 $ (48,303 ) $ (33,651 )

Earnings per Common Share

Earnings per Common Share	3 Months Ended
	Mar. 31, 2016
Earnings Per Share [Abstract]
Earnings per Common Share	13. 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 March 31, 2016 2015 Net income $ 26,132 $ 40,343 Less: Preferred stock dividends 2,010 2,010 Net income available to common stockholders $ 24,122 $ 38,333 Basic weighted average common shares outstanding 193,585,702 174,152,283 Net effect of dilutive stock options, warrants, restricted stock and convertible debt 1,292,220 1,673,693 Diluted weighted average common shares outstanding 194,877,922 175,825,976 Earnings per common share: Basic $ 0.12 $ 0.22 Diluted $ 0.12 $ 0.22 For the three months ended March 31, 2016 and 2015, 15,501 and 24,272 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	3 Months Ended
	Mar. 31, 2016
Supplemental Cash Flow Elements [Abstract]
Cash Flow Information	14. CASH FLOW INFORMATION Following is a summary of supplemental cash flow information: 2016 2015 Three Months Ended March 31 Interest paid on deposits and other borrowings $ 13,794 $ 11,626 Income taxes paid — — Transfers of loans to other real estate owned 8,049 1,965 Financing of other real estate owned sold 62 166

Business Segments

Business Segments	3 Months Ended
	Mar. 31, 2016
Segment Reporting [Abstract]
Business Segments	15. 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 Management Insurance Consumer Parent Consolidated At or for the Three Months Ended March 31, 2016 Interest income $ 143,978 $ — $ 22 $ 9,785 $ 1,969 $ 155,754 Interest expense 12,594 — — 941 1,865 15,400 Net interest income 131,384 — 22 8,844 104 140,354 Provision for credit losses 9,917 — — 1,526 325 11,768 Non-interest income 31,233 8,816 4,194 716 1,085 46,044 Non-interest expense 118,048 7,089 3,301 5,204 357 133,999 Intangible amortization 2,441 65 143 — — 2,649 Income tax expense (benefit) 10,117 605 275 1,112 (259 ) 11,850 Net income (loss) 22,094 1,057 497 1,718 766 26,132 Total assets 20,151,815 20,540 21,680 188,547 (58,058 ) 20,324,524 Total intangibles 1,062,079 10,383 12,779 1,809 — 1,087,050 Community Wealth Management Insurance Consumer Parent Consolidated At or for the Three Months Ended March 31, 2015 Interest income $ 122,118 $ — $ 23 $ 9,593 $ 1,635 $ 133,369 Interest expense 9,941 — — 860 647 11,448 Net interest income 112,177 — 23 8,733 988 121,921 Provision for credit losses 6,327 — — 1,574 235 8,136 Non-interest income 27,301 8,387 3,593 676 (1,775 ) 38,182 Non-interest expense 77,079 6,493 4,170 4,808 (10 ) 92,540 Intangible amortization 1,947 68 100 — — 2,115 Income tax expense (benefit) 15,931 658 (226 ) 1,149 (543 ) 16,969 Net income (loss) 38,194 1,168 (428 ) 1,878 (469 ) 40,343 Total assets 16,100,851 21,125 18,464 182,662 (44,254 ) 16,278,848 Total intangibles 852,764 10,652 10,021 1,809 — 875,246

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2016
Fair Value Disclosures [Abstract]
Fair Value Measurements	16. FAIR VALUE MEASUREMENTS The Corporation uses fair value measurements to record fair value adjustments to certain financial assets and liabilities and to determine fair value disclosures. Securities available for sale and derivatives are recorded at fair value on a recurring basis. Additionally, from time to time, the Corporation may be required to record at fair value other assets on a non-recurring basis, such as mortgage loans held for sale, certain impaired loans, OREO and certain other assets. Fair value is defined as an exit price, representing the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Fair value measurements are not adjusted for transaction costs. Fair value is a market-based measure considered from the perspective of a market participant who holds the asset or owes the liability rather than an entity-specific measure. In determining fair value, the Corporation uses various valuation approaches, including market, income and cost approaches. ASC 820, Fair Value Measurements and Disclosures The fair value hierarchy gives the highest priority to unadjusted quoted market prices in active markets for identical assets or liabilities (Level 1 measurement) and the lowest priority to unobservable inputs (Level 3 measurement). The fair value hierarchy is broken down into three levels based on the reliability of inputs as follows: Measurement Definition Level 1 valuation is based upon unadjusted quoted market prices for identical instruments traded in active markets. Level 2 valuation is based upon quoted market prices for similar instruments traded in active markets, quoted market prices for identical or similar instruments traded in markets that are not active and model-based valuation techniques for which all significant assumptions are observable in the market or can be corroborated by market data. Level 3 valuation is derived from other valuation methodologies including discounted cash flow models and similar techniques that use significant assumptions not observable in the market. These unobservable assumptions reflect estimates of assumptions that market participants would use in determining fair value. A financial instrument’s level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement. Following is a description of the valuation methodologies the Corporation uses for financial instruments recorded at fair value on either a recurring or non-recurring basis: Securities Available For Sale Securities available for sale consists of both debt and equity securities. These securities are recorded at fair value on a recurring basis. At March 31, 2016, 99.9% of these securities used valuation methodologies involving market-based or market-derived information, collectively Level 1 and Level 2 measurements, to measure fair value. The remaining 0.1% of these securities were measured using model-based techniques, with primarily unobservable (Level 3) inputs. The Corporation closely monitors market conditions involving assets that have become less actively traded. If the fair value measurement is based upon recent observable market activity of such assets or comparable assets (other than forced or distressed transactions) that occur in sufficient volume, and do not require significant adjustment using unobservable inputs, those assets are classified as Level 1 or Level 2; if not, they are classified as Level 3. Making this assessment requires significant judgment. The Corporation uses prices from independent pricing services and, to a lesser extent, indicative (non-binding) quotes from independent brokers, to measure the fair value of investment securities. The Corporation validates prices received from pricing services or brokers using a variety of methods, including, but not limited to, comparison to secondary pricing services, corroboration of pricing by reference to other independent market data such as secondary broker quotes and relevant benchmark indices, and review of pricing information by Corporate personnel familiar with market liquidity and other market-related conditions. Derivative Financial Instruments The Corporation determines its fair value for derivatives using widely accepted valuation techniques including discounted cash flow analysis on the expected cash flows of each derivative. This analysis reflects contractual terms of the derivative, including the period to maturity and uses observable market based inputs, including interest rate curves and implied volatilities. The Corporation incorporates credit valuation adjustments to appropriately reflect both its own non-performance risk and the respective counterparty’s non-performance risk in the fair value measurements. In adjusting the fair value of its derivative contracts for the effect of non-performance risk, the Corporation considers the impact of netting and any applicable credit enhancements, such as collateral postings, thresholds, mutual puts and guarantees. Although the Corporation has determined that the majority of the inputs used to value its derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with its derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by itself and its counterparties. However, as of March 31, 2016, 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 March 31, 2016 Assets Measured at Fair Value Available for sale debt securities: U.S. Treasury $ — $ 29,994 $ — $ 29,994 U.S. government-sponsored entities — 401,078 — 401,078 Residential mortgage-backed securities: Agency mortgage-backed securities — 1,087,865 — 1,087,865 Agency collateralized mortgage obligations — 525,630 — 525,630 Non-agency collateralized mortgage obligations — 5 1,091 1,096 Commercial mortgage-backed securities — 3,673 — 3,673 States of the U.S. and political subdivisions — 39,804 — 39,804 Other debt securities — 8,908 — 8,908 — 2,096,957 1,091 2,098,048 Available for sale equity securities: Financial services industry 102 636 424 1,162 Insurance services industry 133 — — 133 235 636 424 1,295 235 2,097,593 1,515 2,099,343 Derivative financial instruments: Trading — 80,125 — 80,125 Not for trading — 7,881 — 7,881 — 88,006 — 88,006 $ 235 $ 2,185,599 $ 1,515 $ 2,187,349 Liabilities Measured at Fair Value Derivative financial instruments: Trading — $ 80,659 — $ 80,659 Not for trading — 1,560 — 1,560 — $ 82,219 — $ 82,219 Level 1 Level 2 Level 3 Total December 31, 2015 Assets Measured at Fair Value Available for sale debt securities: U.S. Treasury $ — $ 29,796 $ — $ 29,796 U.S. government-sponsored entities — 367,994 — 367,994 Residential mortgage-backed securities: Agency mortgage-backed securities — 704,831 — 704,831 Agency collateralized mortgage obligations — 495,830 — 495,830 Non-agency collateralized mortgage obligations — 6 1,184 1,190 Commercial mortgage-backed securities — 4,287 — 4,287 States of the U.S. and political subdivisions — 11,057 — 11,057 Other debt securities — 14,286 — 14,286 — 1,628,087 1,184 1,629,271 Available for sale equity securities: Financial services industry 97 632 439 1,168 Insurance services industry 128 — — 128 225 632 439 1,296 225 1,628,719 1,623 1,630,567 Derivative financial instruments: Trading — 50,017 — 50,017 Not for trading — 3,185 — 3,185 — 53,202 — 53,202 $ 225 $ 1,681,921 $ 1,623 $ 1,683,769 Liabilities Measured at Fair Value Derivative financial instruments: Trading — $ 50,510 — $ 50,510 Not for trading — 1,095 — 1,095 — $ 51,605 — $ 51,605 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: Equity Residential Non-Agency Collateralized Mortgage Obligations Total Three Months Ended March 31, 2016 Balance at beginning of period $ 439 $ 1,184 $ 1,623 Total gains (losses) – realized/unrealized: Included in earnings — — — Included in other comprehensive income (15 ) (28 ) (43 ) Accretion included in earnings — 2 2 Purchases, issuances, sales and settlements: Purchases — — — Issuances — — — Sales/redemptions — — — Settlements — (67 ) (67 ) Transfers from Level 3 — — — Transfers into Level 3 — — — Balance at end of period $ 424 $ 1,091 $ 1,515 Year Ended December 31, 2015 Balance at beginning of period $ 475 $ 1,420 $ 1,895 Total gains (losses) – realized/unrealized: Included in earnings — — — Included in other comprehensive income 20 (4 ) 16 Accretion included in earnings — 5 5 Purchases, issuances, sales and settlements: Purchases — — — Issuances — — — Sales/redemptions — — — Settlements — (237 ) (237 ) Transfers from Level 3 (56 ) — (56 ) Transfers into Level 3 — — — Balance at end of period $ 439 $ 1,184 $ 1,623 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. There were no transfers of assets or liabilities between the hierarchy levels during the first three months of 2016. During 2015, the Corporation transferred an equity security totaling $56 to non-marketable equity securities, reflected in other assets on the Consolidated Balance Sheet. For the three months ended March 31, 2016 and 2015, 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 March 31, 2016 Impaired loans — $ 957 $ 7,257 $ 8,214 Other real estate owned — 1,148 868 2,016 December 31, 2015 Impaired loans — 124 3,704 3,828 Other real estate owned — 5,705 2,126 7,831 Substantially all of the fair value amounts in the table above were estimated at a date during the three months or twelve months ended March 31, 2016 and December 31, 2015, 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 three months ended March 31, 2016 had a carrying amount of $14,064 and an allocated allowance for credit losses of $6,012. The allocated allowance is based on fair value of $8,214 less estimated costs to sell of $162. The allowance for credit losses includes a provision applicable to the current period fair value measurements of $3,362, which was included in the provision for credit losses for the three months ended March 31, 2016. OREO with a carrying amount of $2,616 was written down to $1,803 (fair value of $2,016 less estimated costs to sell of $213), resulting in a loss of $813, which was included in earnings for the three months ended March 31, 2016. 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 March 31, 2016, 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 March 31, 2016 Financial Assets Cash and cash equivalents $ 345,945 $ 345,945 $ 345,945 $ — $ — Securities available for sale 2,099,343 2,099,343 235 2,097,593 1,515 Securities held to maturity 1,776,020 1,803,453 — 1,801,022 2,431 Net loans and leases, including loans held for sale 14,025,482 13,969,315 — — 13,969,315 Derivative assets 88,006 88,006 — 88,006 — Accrued interest receivable 53,609 53,609 53,609 — — Financial Liabilities Deposits 15,390,483 15,397,218 12,700,899 2,696,319 — Short-term borrowings 1,563,888 1,563,947 1,563,947 — — Long-term borrowings 657,445 656,929 — — 656,929 Derivative liabilities 82,219 82,219 — 82,219 — Accrued interest payable 9,063 9,063 9,063 — — Carrying Fair Value Measurements Amount Fair Value Level 1 Level 2 Level 3 December 31, 2015 Financial Assets Cash and cash equivalents $ 489,119 $ 489,119 $ 489,119 $ — $ — Securities available for sale 1,630,567 1,630,567 225 1,628,719 1,623 Securities held to maturity 1,637,061 1,643,416 — 1,640,721 2,695 Net loans and leases, including loans held for sale 12,053,209 11,863,882 — — 11,863,882 Derivative assets 53,202 53,202 — 53,202 — Accrued interest receivable 44,920 44,920 44,920 — — Financial Liabilities Deposits 12,623,463 12,610,914 10,157,997 2,452,917 — Short-term borrowings 2,048,896 2,048,943 2,048,943 — — Long-term borrowings 641,480 637,935 — — 637,935 Derivative liabilities 51,605 51,605 — 51,605 — Accrued interest payable 7,457 7,457 7,457 — —

Summary of Significant Accoun24

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2016
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 26, 2016.
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, fair value measurements and income taxes.
Business Combinations	Business Combinations Business combinations are accounted for by applying the acquisition method in accordance with Accounting Standards Codification (ASC) 805, Business Combinations.
Cloud Computing Arrangements	Cloud Computing Arrangements Beginning in 2016, for new or materially modified contracts, the Corporation prospectively adopted new accounting principles to evaluate fees paid for cloud computing arrangements to determine if those arrangements include the purchase of or license to software that should be accounted for separately as internal-use software. If a contract includes the purchase or license to software that should be accounted for separately as internal-use software, the contract is amortized over the software’s identified useful life in amortization of intangibles. For contracts that do not include a software license, the contract is accounted for as a service contract with fees paid recorded in other non-interest expense.
Stock Based Compensation	Stock Based Compensation The Corporation accounts for its stock based compensation awards in accordance with Accounting Standards Codification (ASC) 718, Compensation—Stock Compensation, ASC 718 requires companies to estimate the fair value of share-based awards on the date of grant. The value of the portion of the award that is ultimately expected to vest is recognized as expense in the Corporation’s consolidated statement of comprehensive income over the shorter of requisite service periods or the period through the date that the employee first becomes eligible to retire. Some of the Corporation’s plans contain performance targets that affect vesting and can be achieved after the requisite service period and accounted for as a performance condition. Beginning in 2016, the performance target is not reflected in the estimation of the award’s grant date fair value and compensation cost is recognized in the period in which it becomes probable that the performance condition will be achieved. Because share-based compensation expense is based on awards that are ultimately expected to vest, share-based compensation expense has been reduced to account for estimated forfeitures. Forfeitures are estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates.
Variable Interest Entities	Variable Interest Entities The Corporation has investments in certain partnerships and limited liability entities that qualify as variable interest entities (VIEs). These entities are evaluated on an on-going basis to determine whether they should be consolidated. Consolidation of a VIE is appropriate if a reporting entity holds a controlling financial interest in the VIE. The Corporation has determined that it does not hold a controlling financial interest in any of the VIEs and, therefore, the assets and liabilities of these entities are not consolidated into its financial statements. Instead, investments in these entities are accounted for under the equity method of accounting and are evaluated periodically for impairment. The recorded investment in these entities is reported in other assets on the consolidated balance sheets.
Revenue Recognition	Revenue Recognition Accounting Standards Update (ASU or Update) 2016-10, Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing, ASU 2016-08, Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations (Reporting Revenue Gross versus Net), ASU 2014-09, Revenue from Contracts with Customers (Topic 606), The guidance for these Revenue Recognition Updates is effective for annual periods beginning in the first quarter of 2018. Early application is permitted beginning in the first quarter of 2017. The Corporation is currently assessing the potential impact to its Consolidated Financial Statements.
Investments	Investments ASU 2016-07, Investments—Equity Method and Joint Ventures (Topic 323): Simplifying the Transition to the Equity Method of Accounting,
Derivative and Hedging Activities	Derivative and Hedging Activities ASU 2016-06, Derivatives and Hedging (Topic 815): Contingent Put and Call Options in Debt Instruments (a consensus of the Emerging Issues Task Force), ASU 2016-05, Derivatives and Hedging (Topic 815): Effect of Derivative Contract Novations on Existing Hedge Accounting Relationships (a consensus of the Emerging Issues Task Force),
Extinguishments of Liabilities	Extinguishments of Liabilities ASU 2016-04, Liabilities—Extinguishments of Liabilities (Subtopic 405-20): Recognition of Breakage for Certain Prepaid Stored-Value Products (a consensus of the Emerging Issues Task Force),
Leases	Leases ASU 2016-02, Leases (Topic 842),
Financial Instruments - Recognition and Measurement	Financial Instruments – Recognition and Measurement ASU 2016-01, Financial Instruments—Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities,
ASU 2016-09 [Member]
Stock Based Compensation	Stock Based Compensation ASU 2016-09, Compensation—Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting,

Mergers and Acquisitions (Table

Mergers and Acquisitions (Tables)	3 Months Ended
	Mar. 31, 2016
Business Combinations [Abstract]
Business Acquisition Pro Forma Information	The following pro forma financial information for the three months ended March 31, 2015 reflects the Corporation’s estimated consolidated pro forma results of operations as if the METR acquisition occurred on January 1, 2015, unadjusted for potential cost savings and other business synergies the Corporation expects to receive as a result of the acquisition: F.N.B. METR Pro Forma Pro Forma Revenue (net interest income and non-interest income) $ 160,103 $ 33,626 $ (1,061 ) $ 192,668 Net income 40,343 5,722 (2,003 ) 44,062 Net income available to common stockholders 38,333 5,702 (1,983 ) 42,052 Earnings per common share – basic 0.22 0.40 — 0.20 Earnings per common share – diluted 0.22 0.39 — 0.20
Amounts Recorded on Consolidated Balance Sheet in Conjunction with METR Acquisition and BofA Branch Acquisition	The following table summarizes the amounts recorded on the consolidated balance sheet as of each of the acquisition dates in conjunction with the METR acquisition and the BofA branch acquisition discussed above: METR BofA Branches Fair value of consideration paid $ 404,020 $ — Fair value of identifiable assets acquired: Cash and cash equivalents 46,854 148,159 Securities 722,980 — Loans 1,869,046 842 Other intangible assets 36,801 3,000 Other assets 121,518 1,133 Total identifiable assets acquired 2,797,199 153,134 Fair value of liabilities assumed: Deposits 2,327,219 154,619 Borrowings 227,539 — Other liabilities 12,269 — Total liabilities assumed 2,567,027 154,619 Fair value of net identifiable assets acquired 230,172 (1,485 ) Goodwill recognized (1) $ 173,848 $ 1,485 (1) All of the goodwill for both of these transactions has been recorded by FNBPA.

Securities (Tables)

Securities (Tables)	3 Months Ended
	Mar. 31, 2016
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 March 31, 2016 U.S. Treasury $ 29,771 $ 223 $ — $ 29,994 U.S. government-sponsored entities 398,497 2,617 (36 ) 401,078 Residential mortgage-backed securities: Agency mortgage-backed securities 1,075,195 12,691 (21 ) 1,087,865 Agency collateralized mortgage obligations 524,722 3,812 (2,904 ) 525,630 Non-agency collateralized mortgage obligations 1,111 — (15 ) 1,096 Commercial mortgage-backed securities 3,674 — (1 ) 3,673 States of the U.S. and political subdivisions 39,620 283 (99 ) 39,804 Other debt securities 9,754 177 (1,023 ) 8,908 Total debt securities 2,082,344 19,803 (4,099 ) 2,098,048 Equity securities 975 320 — 1,295 $ 2,083,319 $ 20,123 $ (4,099 ) $ 2,099,343 December 31, 2015 U.S. Treasury $ 29,738 $ 58 $ — $ 29,796 U.S. government-sponsored entities 368,463 856 (1,325 ) 367,994 Residential mortgage-backed securities: Agency mortgage-backed securities 703,069 4,594 (2,832 ) 704,831 Agency collateralized mortgage obligations 503,328 1,032 (8,530 ) 495,830 Non-agency collateralized mortgage obligations 1,177 13 — 1,190 Commercial mortgage-backed securities 4,299 — (12 ) 4,287 States of the U.S. and political subdivisions 10,748 309 — 11,057 Other debt securities 14,729 208 (651 ) 14,286 Total debt securities 1,635,551 7,070 (13,350 ) 1,629,271 Equity securities 975 324 (3 ) 1,296 $ 1,636,526 $ 7,394 $ (13,353 ) $ 1,630,567
Schedule of Amortized Cost and Fair Value of Securities Held to Maturity	Amortized Cost Gross Gross Fair Value Securities Available for Sale March 31, 2016 U.S. Treasury $ 29,771 $ 223 $ — $ 29,994 U.S. government-sponsored entities 398,497 2,617 (36 ) 401,078 Residential mortgage-backed securities: Agency mortgage-backed securities 1,075,195 12,691 (21 ) 1,087,865 Agency collateralized mortgage obligations 524,722 3,812 (2,904 ) 525,630 Non-agency collateralized mortgage obligations 1,111 — (15 ) 1,096 Commercial mortgage-backed securities 3,674 — (1 ) 3,673 States of the U.S. and political subdivisions 39,620 283 (99 ) 39,804 Other debt securities 9,754 177 (1,023 ) 8,908 Total debt securities 2,082,344 19,803 (4,099 ) 2,098,048 Equity securities 975 320 — 1,295 $ 2,083,319 $ 20,123 $ (4,099 ) $ 2,099,343 December 31, 2015 U.S. Treasury $ 29,738 $ 58 $ — $ 29,796 U.S. government-sponsored entities 368,463 856 (1,325 ) 367,994 Residential mortgage-backed securities: Agency mortgage-backed securities 703,069 4,594 (2,832 ) 704,831 Agency collateralized mortgage obligations 503,328 1,032 (8,530 ) 495,830 Non-agency collateralized mortgage obligations 1,177 13 — 1,190 Commercial mortgage-backed securities 4,299 — (12 ) 4,287 States of the U.S. and political subdivisions 10,748 309 — 11,057 Other debt securities 14,729 208 (651 ) 14,286 Total debt securities 1,635,551 7,070 (13,350 ) 1,629,271 Equity securities 975 324 (3 ) 1,296 $ 1,636,526 $ 7,394 $ (13,353 ) $ 1,630,567 Securities Held to Maturity March 31, 2016 U.S. Treasury $ 500 $ 184 $ — $ 684 U.S. government-sponsored entities 122,333 1,606 — 123,939 Residential mortgage-backed securities: Agency mortgage-backed securities 830,640 18,063 (4 ) 848,699 Agency collateralized mortgage obligations 520,576 4,123 (2,931 ) 521,768 Non-agency collateralized mortgage obligations 2,436 4 (9 ) 2,431 Commercial mortgage-backed securities 50,526 1,222 (92 ) 51,656 States of the U.S. and political subdivisions 249,009 5,441 (174 ) 254,276 $ 1,776,020 $ 30,643 $ (3,210 ) $ 1,803,453 December 31, 2015 U.S. Treasury $ 500 $ 153 $ — $ 653 U.S. government-sponsored entities 137,385 809 (395 ) 137,799 Residential mortgage-backed securities: Agency mortgage-backed securities 709,970 9,858 (1,176 ) 718,652 Agency collateralized mortgage obligations 499,694 803 (7,657 ) 492,840 Non-agency collateralized mortgage obligations 2,681 14 — 2,695 Commercial mortgage-backed securities 51,258 115 (259 ) 51,114 States of the U.S. and political subdivisions 235,573 4,191 (101 ) 239,663 $ 1,637,061 $ 15,943 $ (9,588 ) $ 1,643,416
Gross Gains and Gross Losses Realized on Sales of Securities	Gross gains and gross losses were realized on securities as follows: Three Months Ended March 31, 2016 2015 Gross gains $ 71 $ — Gross losses — (9 ) $ 71 $ (9 )
Amortized Cost and Fair Value of Securities, by Contractual Maturities	As of March 31, 2016, 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 $ 179 $ 180 $ 12,126 $ 12,140 Due from one to five years 441,067 444,025 114,319 115,578 Due from five to ten years 29,112 29,332 53,587 54,986 Due after ten years 7,284 6,247 191,810 196,195 477,642 479,784 371,842 378,899 Residential mortgage-backed securities: Agency mortgage-backed securities 1,075,195 1,087,865 830,640 848,699 Agency collateralized mortgage obligations 524,722 525,630 520,576 521,768 Non-agency collateralized mortgage obligations 1,111 1,096 2,436 2,431 Commercial mortgage-backed securities 3,674 3,673 50,526 51,656 Equity securities 975 1,295 — — $ 2,083,319 $ 2,099,343 $ 1,776,020 $ 1,803,453
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 Unrealized # Fair Value Unrealized Securities Available for Sale March 31, 2016 U.S. government-sponsored entities 2 $ 17,960 $ (36 ) — $ — $ — 2 $ 17,960 $ (36 ) Residential mortgage-backed securities: Agency mortgage-backed securities 2 56,402 (21 ) — — — 2 56,402 (21 ) Agency collateralized mortgage obligations 2 29,786 (28 ) 15 175,354 (2,876 ) 17 205,140 (2,904 ) Non-agency collateralized mortgage obligations 1 1,091 (15 ) — — — 1 1,091 (15 ) Commercial mortgage-backed securities 1 3,673 (1 ) — — — 1 3,673 (1 ) States of the U.S. and political subdivisions 16 21,325 (99 ) — — — 16 21,325 (99 ) Other debt securities — — — 3 3,875 (1,023 ) 3 3,875 (1,023 ) 24 $ 130,237 $ (200 ) 18 $ 179,229 $ (3,899 ) 42 $ 309,466 $ (4,099 ) December 31, 2015 U.S. government-sponsored entities 6 $ 99,131 $ (814 ) 2 $ 34,487 $ (511 ) 8 $ 133,618 $ (1,325 ) Residential mortgage-backed securities: Agency mortgage-backed securities 19 359,250 (2,832 ) — — — 19 359,250 (2,832 ) Agency collateralized mortgage obligations 9 126,309 (1,366 ) 18 215,330 (7,164 ) 27 341,639 (8,530 ) Commercial mortgage-backed securities 1 4,287 (12 ) — — — 1 4,287 (12 ) Other debt securities — — — 3 4,245 (651 ) 3 4,245 (651 ) Equity securities 1 632 (3 ) — — — 1 632 (3 ) 36 $ 589,609 $ (5,027 ) 23 $ 254,062 $ (8,326 ) 59 $ 843,671 $ (13,353 ) Securities Held to Maturity March 31, 2016 Residential mortgage-backed securities: Agency mortgage-backed securities 1 $ 922 (4 ) — $ — — 1 $ 922 $ (4 ) Agency collateralized mortgage obligations — — — 16 181,913 (2,931 ) 16 181,913 (2,931 ) Non-agency collateralized mortgage obligations 2 1,294 (9 ) — — — 2 1,294 (9 ) Commercial mortgage-backed securities 1 8,579 (92 ) — — — 1 8,579 (92 ) States of the U.S. and political subdivisions 5 10,007 (173 ) 1 2,055 (1 ) 6 12,062 (174 ) 9 $ 20,802 $ (278 ) 17 $ 183,968 $ (2,932 ) 26 $ 204,770 $ (3,210 ) December 31, 2015 U.S. government-sponsored entities 3 $ 39,843 $ (173 ) 1 $ 14,778 $ (222 ) 4 $ 54,621 $ (395 ) Residential mortgage-backed securities: Agency mortgage-backed securities 17 212,024 (1,159 ) 1 917 (17 ) 18 212,941 (1,176 ) Agency collateralized mortgage obligations 11 150,593 (1,434 ) 14 160,716 (6,223 ) 25 311,309 (7,657 ) Commercial mortgage-backed securities 3 46,278 (259 ) — — — 3 46,278 (259 ) States of the U.S. and political subdivisions 9 17,616 (101 ) — — — 9 17,616 (101 ) 43 $ 466,354 $ (3,126 ) 16 $ 176,411 $ (6,462 ) 59 $ 642,765 $ (9,588 )
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: Equities Total For the Three Months Ended March 31, 2016 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 Three Months Ended March 31, 2015 Beginning balance $ 27 $ 27 Loss where impairment was not previously recognized — — Additional loss where impairment was previously recognized — — Reduction due to credit impaired securities sold — — Ending balance $ 27 $ 27

Loans and Leases (Tables)

Loans and Leases (Tables)	3 Months Ended
	Mar. 31, 2016
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 March 31, 2016 Commercial real estate $ 3,605,301 $ 1,648,359 $ 5,253,660 Commercial and industrial 2,574,321 471,946 3,046,267 Commercial leases 202,605 — 202,605 Total commercial loans and leases 6,382,227 2,120,305 8,502,532 Direct installment 1,686,037 104,765 1,790,802 Residential mortgages 1,105,680 425,699 1,531,379 Indirect installment 1,025,413 314 1,025,727 Consumer lines of credit 1,034,681 226,812 1,261,493 Other 53,666 — 53,666 $ 11,287,704 $ 2,877,895 $ 14,165,599 Originated Loans Acquired Loans Total Loans and December 31, 2015 Commercial real estate $ 3,531,146 $ 577,910 $ 4,109,056 Commercial and industrial 2,534,351 67,371 2,601,722 Commercial leases 204,553 — 204,553 Total commercial loans and leases 6,270,050 645,281 6,915,331 Direct installment 1,660,717 45,919 1,706,636 Residential mortgages 1,044,689 351,282 1,395,971 Indirect installment 996,175 554 996,729 Consumer lines of credit 1,021,830 115,425 1,137,255 Other 38,518 — 38,518 $ 11,031,979 $ 1,158,461 $ 12,190,440
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: March 31, 2016 December 31, Accounted for under ASC 310-30: Outstanding balance $ 2,849,661 $ 1,258,418 Carrying amount 2,485,752 1,011,139 Accounted for under ASC 310-20: Outstanding balance 403,252 146,161 Carrying amount 386,564 140,595 Total acquired loans: Outstanding balance 3,252,913 1,404,579 Carrying amount 2,872,316 1,151,734
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. Three Months Ended 2016 2015 Balance at beginning of period $ 256,120 $ 331,899 Acquisitions 284,092 — Reduction due to unexpected early payoffs (9,375 ) (11,909 ) Reclass from non-accretable difference 10,494 7,676 Disposals/transfers (260 ) (118 ) Accretion (13,204 ) (16,264 ) Balance at end of period $ 527,867 $ 311,284
Summary of Acquisition of Purchased Loans	The following table reflects amounts at acquisition for all purchased loans subject to ASC 310-30 (impaired and non-impaired) acquired from METR. Acquired Acquired Performing Loans Total Contractually required cash flows at acquisition $ 99,611 $ 2,074,623 $ 2,174,234 Non-accretable difference (expected losses and foregone interest) (52,995 ) (248,666 ) (301,661 ) Cash flows expected to be collected at acquisition 46,616 1,825,957 1,872,573 Accretable yield (1,063 ) (283,029 ) (284,092 ) Basis in acquired loans at acquisition $ 45,553 $ 1,542,928 $ 1,588,481
Summary of Non-Performing Assets	Following is a summary of non-performing assets: March 31, 2016 December 31, Non-accrual loans $ 63,036 $ 49,897 Troubled debt restructurings 21,453 22,028 Total non-performing loans 84,489 71,925 Other real estate owned (OREO) 50,526 38,918 Total non-performing assets $ 135,015 $ 110,843 Asset quality ratios: Non-performing loans as a percent of total loans and leases 0.60 % 0.59 % Non-performing loans + OREO as a percent of total loans and leases + OREO 0.95 % 0.91 % Non-performing assets as a percent of total assets 0.66 % 0.63 %
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 ³ 90 Days Non- Accrual Total Past Due Current Total Loans and Originated Loans and Leases March 31, 2016 Commercial real estate $ 9,342 $ 1 $ 24,083 $ 33,426 $ 3,571,875 $ 3,605,301 Commercial and industrial 4,653 3 24,627 29,283 2,545,038 2,574,321 Commercial leases 1,422 15 894 2,331 200,274 202,605 Total commercial loans and leases 15,417 19 49,604 65,040 6,317,187 6,382,227 Direct installment 6,845 3,463 5,646 15,954 1,670,083 1,686,037 Residential mortgages 7,398 1,545 3,446 12,389 1,093,291 1,105,680 Indirect installment 5,479 369 1,347 7,195 1,018,218 1,025,413 Consumer lines of credit 1,523 661 1,954 4,138 1,030,543 1,034,681 Other 49 63 — 112 53,554 53,666 $ 36,711 $ 6,120 $ 61,997 $ 104,828 $ 11,182,876 $ 11,287,704 December 31, 2015 Commercial real estate $ 11,006 $ 1 $ 23,503 $ 34,510 $ 3,496,636 $ 3,531,146 Commercial and industrial 5,409 3 14,382 19,794 2,514,557 2,534,351 Commercial leases 924 — 659 1,583 202,970 204,553 Total commercial loans and leases 17,339 4 38,544 55,887 6,214,163 6,270,050 Direct installment 9,254 3,813 4,806 17,873 1,642,844 1,660,717 Residential mortgages 8,135 1,470 2,882 12,487 1,032,202 1,044,689 Indirect installment 9,472 379 1,361 11,212 984,963 996,175 Consumer lines of credit 2,410 1,189 1,181 4,780 1,017,050 1,021,830 Other 73 169 — 242 38,276 38,518 $ 46,683 $ 7,024 $ 48,774 $ 102,481 $ 10,929,498 $ 11,031,979 30-89 Days Past Due ³ 90 Days and Still Non- Accrual Total Past Due (1) (2) Current Discount Total Loans Acquired Loans March 31, 2016 Commercial real estate $ 27,329 $ 23,563 $ 740 $ 51,632 $ 1,695,949 $ (99,222 ) $ 1,648,359 Commercial and industrial 1,879 6,596 152 8,627 499,764 (36,445 ) 471,946 Total commercial loans 29,208 30,159 892 60,259 2,195,713 (135,667 ) 2,120,305 Direct installment 2,855 958 — 3,813 97,964 2,988 104,765 Residential mortgages 11,010 15,498 — 26,508 436,528 (37,337 ) 425,699 Indirect installment — 6 — 6 413 (105 ) 314 Consumer lines of credit 1,578 1,292 147 3,017 228,682 (4,887 ) 226,812 $ 44,651 $ 47,913 $ 1,039 $ 93,603 $ 2,959,300 $ (175,008 ) $ 2,877,895 December 31, 2015 Commercial real estate $ 6,399 $ 12,752 $ 931 $ 20,082 $ 593,128 $ (35,300 ) $ 577,910 Commercial and industrial 1,065 616 103 1,784 72,037 (6,450 ) 67,371 Total commercial loans 7,464 13,368 1,034 21,866 665,165 (41,750 ) 645,281 Direct installment 837 659 — 1,496 43,596 827 45,919 Residential mortgages 5,871 15,136 — 21,007 366,742 (36,467 ) 351,282 Indirect installment 32 9 — 41 571 (58 ) 554 Consumer lines of credit 830 546 89 1,465 117,443 (3,483 ) 115,425 $ 15,034 $ 29,718 $ 1,123 $ 45,875 $ 1,193,517 $ (80,931 ) $ 1,158,461 (1) Past due information for acquired loans is based on the contractual balance outstanding at March 31, 2016 and December 31, 2015. (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: Originated Commercial Loan and Lease Credit Quality Categories Pass Special Substandard Doubtful Total Originated Loans and Leases March 31, 2016 Commercial real estate $ 3,445,547 $ 97,426 $ 61,928 $ 400 $ 3,605,301 Commercial and industrial 2,346,483 114,408 107,818 5,612 2,574,321 Commercial leases 194,947 3,121 4,537 — 202,605 $ 5,986,977 $ 214,955 $ 174,283 $ 6,012 $ 6,382,227 December 31, 2015 Commercial real estate $ 3,416,527 $ 52,887 $ 61,411 $ 321 $ 3,531,146 Commercial and industrial 2,335,103 109,539 87,380 2,329 2,534,351 Commercial leases 198,207 2,447 3,899 — 204,553 $ 5,949,837 $ 164,873 $ 152,690 $ 2,650 $ 6,270,050 Acquired Loans March 31, 2016 Commercial real estate $ 1,331,863 $ 156,709 $ 152,929 $ 6,858 $ 1,648,359 Commercial and industrial 369,178 23,214 77,897 1,657 471,946 $ 1,701,041 $ 179,923 $ 230,826 $ 8,515 $ 2,120,305 December 31, 2015 Commercial real estate $ 464,162 $ 47,619 $ 66,129 — $ 577,910 Commercial and industrial 56,446 3,182 7,743 — 67,371 $ 520,608 $ 50,801 $ 73,872 — $ 645,281
Summary of Consumer Loans by Payment Status	Following is a table showing originated consumer loans by payment status: Originated Consumer Loan Credit Quality by Payment Status Performing Non- Performing Total March 31, 2016 Direct installment $ 1,671,896 $ 14,141 $ 1,686,037 Residential mortgages 1,092,329 13,351 1,105,680 Indirect installment 1,023,909 1,504 1,025,413 Consumer lines of credit 1,031,798 2,883 1,034,681 Other 53,666 — 53,666 $ 4,873,598 $ 31,879 $ 4,905,477 Originated Consumer Loan Credit Quality by Payment Status Performing Non- Performing Total December 31, 2015 Direct installment $ 1,646,925 $ 13,792 $ 1,660,717 Residential mortgages 1,031,926 12,763 1,044,689 Indirect installment 994,661 1,514 996,175 Consumer lines of credit 1,019,783 2,047 1,021,830 Other 38,518 — 38,518 $ 4,731,813 $ 30,116 $ 4,761,929
Summary of Impaired Loans and Leases, by Class	Following is a summary of information pertaining to originated loans and leases considered to be impaired, by class of loan and lease: Unpaid Principal Balance Recorded Investment Reserve Recorded Investment Specific Reserve Total Recorded Investment Specific Average Recorded Investment At or for the Three Months Ended March 31, 2016 Commercial real estate $ 33,434 $ 24,035 $ 1,520 $ 25,555 $ 400 $ 25,374 Commercial and industrial 25,965 12,042 12,479 24,521 5,612 19,620 Commercial leases 894 894 — 894 — — Total commercial loans and leases 60,293 36,971 13,999 50,970 6,012 44,994 Direct installment 15,135 14,141 — 14,141 — 13,966 Residential mortgages 13,881 13,351 — 13,351 — 13,058 Indirect installment 3,667 1,504 — 1,504 — 1,509 Consumer lines of credit 3,436 2,883 — 2,883 — 2,465 $ 96,412 $ 68,850 $ 13,999 $ 82,849 $ 6,012 $ 75,992 At or for the Year Ended December 31, 2015 Commercial real estate $ 33,780 $ 24,423 $ 772 $ 25,195 $ 321 $ 26,143 Commercial and industrial 15,860 9,176 5,543 14,719 2,329 12,298 Commercial leases 659 659 — 659 — 747 Total commercial loans and leases 50,299 34,258 6,315 40,573 2,650 39,188 Direct installment 14,679 13,792 — 13,792 — 13,267 Residential mortgages 13,394 12,763 — 12,763 — 12,896 Indirect installment 3,745 1,514 — 1,514 — 1,401 Consumer lines of credit 2,408 2,047 — 2,047 — 2,198 $ 84,525 $ 64,374 $ 6,315 $ 70,689 $ 2,650 $ 68,950
Summary of Payment Status of Originated TDRs	Following is a summary of the payment status of originated TDRs: March 31, 2016 December 31, Accruing: Performing $ 16,508 $ 15,165 Non-performing 21,453 22,028 Non-accrual 11,953 8,307 $ 49,914 $ 45,500
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 March 31, 2016 Three Months Ended March 31, 2015 Number of Contracts Pre- Modification Recorded Investment Post- Outstanding Recorded Investment Number of Contracts Pre- Modification Recorded Investment Post- Outstanding Recorded Investment Commercial real estate 4 $ 778 $ 760 2 $ 312 $ 196 Commercial and industrial 2 5,565 3,279 — — — Total commercial loans 6 6,343 4,039 2 312 196 Direct installment 145 1,991 1,961 131 1,526 1,484 Residential mortgages 18 968 951 14 581 631 Indirect installment 3 11 12 5 16 16 Consumer lines of credit 20 243 238 16 270 270 192 $ 9,556 $ 7,201 168 $ 2,705 $ 2,597
Summary of Originated 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 March 31, 2016 (1) Three Months Ended March 31, 2015 (1) Number of Contracts Recorded Investment Number of Contracts Recorded Investment Commercial real estate — $ — — $ — Commercial and industrial — — — — Total commercial loans — — — — Direct installment 28 175 37 105 Residential mortgages 1 50 2 102 Indirect installment 4 5 3 4 Consumer lines of credit 1 10 1 92 34 $ 240 43 $ 303 (1) The recorded investment is as of period end.

Allowance for Credit Losses (Ta

Allowance for Credit Losses (Tables)	3 Months Ended
	Mar. 31, 2016
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 Charge- Recoveries Net Charge- Provision Balance at End of Three Months Ended March 31, 2016 Commercial real estate $ 41,741 $ (1,369 ) $ 597 $ (772 ) $ 2,929 $ 43,898 Commercial and industrial 41,023 (298 ) 190 (108 ) 6,948 47,863 Commercial leases 2,541 (114 ) 14 (100 ) 377 2,818 Total commercial loans and leases 85,305 (1,781 ) 801 (980 ) 10,254 94,579 Direct installment 21,587 (2,667 ) 454 (2,213 ) 1,351 20,725 Residential mortgages 7,909 (85 ) 19 (66 ) (33 ) 7,810 Indirect installment 9,889 (1,942 ) 262 (1,680 ) 856 9,065 Consumer lines of credit 9,582 (474 ) 56 (418 ) (197 ) 8,967 Other 1,013 (554 ) 6 (548 ) 609 1,074 Total allowance on originated loans and leases 135,285 (7,503 ) 1,598 (5,905 ) 12,840 142,220 Purchased credit-impaired loans 834 (160 ) — (160 ) 30 704 Other acquired loans 5,893 (221 ) 306 85 (1,102 ) 4,876 Total allowance on acquired loans 6,727 (381 ) 306 (75 ) (1,072 ) 5,580 Total allowance $ 142,012 $ (7,884 ) $ 1,904 $ (5,980 ) $ 11,768 $ 147,800 Three Months Ended March 31, 2015 Commercial real estate $ 37,588 $ (1,001 ) $ 209 $ (792 ) $ 1,996 $ 38,792 Commercial and industrial 32,645 (684 ) 120 (564 ) 722 32,803 Commercial leases 2,398 (93 ) 10 (83 ) 261 2,576 Total commercial loans and leases 72,631 (1,778 ) 339 (1,439 ) 2,979 74,171 Direct installment 20,538 (2,433 ) 269 (2,164 ) 2,830 21,204 Residential mortgages 8,024 (511 ) 15 (496 ) 943 8,471 Indirect installment 7,504 (1,280 ) 302 (978 ) 1,131 7,657 Consumer lines of credit 8,496 (410 ) 40 (370 ) 764 8,890 Other 759 (335 ) 11 (324 ) 419 854 Total allowance on originated loans and leases 117,952 (6,747 ) 976 (5,771 ) 9,066 121,247 Purchased credit-impaired loans 660 (64 ) 19 (45 ) 6 621 Other acquired loans 7,314 (77 ) 330 253 (936 ) 6,631 Total allowance on acquired loans 7,974 (141 ) 349 208 (930 ) 7,252 Total allowance $ 125,926 $ (6,888 ) $ 1,325 $ (5,563 ) $ 8,136 $ 128,499
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: Originated Allowance Originated Loans and Leases Outstanding Individually Evaluated for Impairment Collectively Evaluated for Impairment Loans and Individually Evaluated for Impairment Collectively Evaluated for Impairment March 31, 2016 Commercial real estate $ 400 $ 43,498 $ 3,605,301 $ 14,260 $ 3,591,041 Commercial and industrial 5,612 42,251 2,574,321 19,679 2,554,642 Commercial leases — 2,818 202,605 — 202,605 Total commercial loans and leases 6,012 88,567 6,382,227 33,939 6,348,288 Direct installment — 20,725 1,686,037 — 1,686,037 Residential mortgages — 7,810 1,105,680 — 1,105,680 Indirect installment — 9,065 1,025,413 — 1,025,413 Consumer lines of credit — 8,967 1,034,681 — 1,034,681 Other — 1,074 53,666 — 53,666 $ 6,012 $ 136,208 $ 11,287,704 $ 33,939 $ 11,253,765 December 31, 2015 Commercial real estate $ 321 $ 41,420 $ 3,531,146 $ 12,904 $ 3,518,242 Commercial and industrial 2,329 38,694 2,534,351 10,802 2,523,549 Commercial leases — 2,541 204,553 — 204,553 Total commercial loans and leases 2,650 82,655 6,270,050 23,706 6,246,344 Direct installment — 21,587 1,660,717 — 1,660,717 Residential mortgages — 7,909 1,044,689 — 1,044,689 Indirect installment — 9,889 996,175 — 996,175 Consumer lines of credit — 9,582 1,021,830 — 1,021,830 Other — 1,013 38,518 — 38,518 $ 2,650 $ 132,635 $ 11,031,979 $ 23,706 $ 11,008,273

Borrowings (Tables)

Borrowings (Tables)	3 Months Ended
	Mar. 31, 2016
Debt Disclosure [Abstract]
Summary of Short-Term Borrowings	Following is a summary of short-term borrowings: March 31, 2016 December 31, Securities sold under repurchase agreements $ 297,562 $ 266,732 Federal Home Loan Bank advances 490,000 1,090,000 Federal funds purchased 652,000 568,000 Subordinated notes 124,326 124,164 $ 1,563,888 $ 2,048,896
Summary of Long-Term Borrowings	Following is a summary of long-term borrowings: March 31, 2016 December 31, Federal Home Loan Bank advances $ 425,147 $ 400,017 Subordinated notes 85,206 84,668 Junior subordinated debt 48,572 58,298 Other subordinated debt 98,520 98,497 $ 657,445 $ 641,480
Junior Subordinated Debt Trusts	The following table provides information relating to the Trusts as of March 31, 2016: Trust Preferred Securities Common Securities Junior Subordinated Debt Stated Maturity Date Interest Rate F.N.B. Statutory Trust II $ 21,500 $ 665 $ 22,165 6/15/36 2.28 % Variable; 3-month LIBOR + 165 basis points (bps) Omega Financial Capital Trust I 26,000 1,114 26,407 10/18/34 2.81 % Variable; 3-month LIBOR + 219 bps $ 47,500 $ 1,779 $ 48,572

Derivative and Hedging Activi30

Derivative and Hedging Activities (Tables)	3 Months Ended
	Mar. 31, 2016
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: March 31, 2016 December 31, 2015 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 $ 7,859 $ 1,341 $ 250,000 $ 3,178 $ 962 Interest rate swaps – not designated 1,373,959 — 80,625 1,262,964 1 50,491 Equity contracts – not designated 1,180 34 — 1,180 18 — Total subject to master netting arrangements 1,625,139 7,893 81,966 1,514,144 3,197 51,453 Not subject to master netting arrangements: Interest rate swaps – not designated 1,373,959 80,091 — 1,262,964 49,998 1 Credit risk contracts – not designated 134,204 22 219 114,753 7 133 Equity contracts – not designated 1,180 — 34 1,180 — 18 Total not subject to master netting arrangements 1,509,343 80,113 253 1,378,897 50,005 152 $ 3,134,482 $ 88,006 $ 82,219 $ 2,893,041 $ 53,202 $ 51,605
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 March 31, 2016 Derivative Assets Subject to master netting arrangements: Interest rate contracts Designated $ 7,859 — $ 7,859 Not designated — — — Equity contracts – not designated 34 — 34 Not subject to master netting arrangements: Interest rate contracts – not designated 80,091 — 80,091 Credit contracts – not designated 22 — 22 $ 88,006 — $ 88,006 December 31, 2015 Derivative Assets Subject to master netting arrangements: Interest rate contracts Designated $ 3,178 — $ 3,178 Not designated 1 — 1 Equity contracts – not designated 18 — 18 Not subject to master netting arrangements: Interest rate contracts – not designated 49,998 — 49,998 Credit contracts – not designated 7 7 $ 53,202 — $ 53,202
Derivative Liabilities	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: March 31, 2016 Derivative Liabilities Subject to master netting arrangements: Interest rate contracts Designated $ 1,341 — $ 1,341 Not designated 80,625 — 80,625 Not subject to master netting arrangements: Interest rate contracts – not designated — — — Credit contracts – not designated 219 — 219 Equity contracts – not designated 34 — 34 $ 82,219 — $ 82,219 December 31, 2015 Derivative Liabilities Subject to master netting arrangements: Interest rate contracts Designated $ 962 — $ 962 Not designated 50,491 — 50,491 Not subject to master netting arrangements: Interest rate contracts – not designated 1 — 1 Credit contracts – not designated 133 133 Equity contracts – not designated 18 — 18 $ 51,605 — $ 51,605
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 Three Months Ended Statement March 31, Location 2016 2015 Interest Rate Contracts Interest income—loans and leases $ 687 $ 809 Interest Rate Contracts Interest expense—short-term borrowings 150 — Interest Rate Swaps Other income (41 ) (107 ) Credit Risk Contracts Other income (71 ) —
Collateral Held By Counterparty [Member]
Derivative Assets	The following table presents a reconciliation of the net amounts of derivative assets and derivative liabilities presented in the balance sheet to the net amounts that would result in the event of offset: Amount Not Offset in the Net Amount the Balance Sheet Financial Cash Net Amount March 31, 2016 Derivative Assets Interest rate contracts: Designated $ 7,859 $ 5,052 $ 2,807 — Not designated — — — — Equity contracts – not designated 34 34 — — $ 7,893 $ 5,086 $ 2,807 — December 31, 2015 Derivative Assets Interest rate contracts: Designated $ 3,178 $ 1,516 $ 1,662 — Not designated 1 1 — — Equity contracts – not designated 18 18 — — $ 3,197 $ 1,535 $ 1,662 —
Derivative Liabilities	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: March 31, 2016 Derivative Liabilities Interest rate contracts: Designated $ 1,341 $ — $ 1,341 $ — Not designated 80,625 31,472 47,487 1,666 $ 81,966 $ 31,472 $ 48,828 $ 1,666 December 31, 2015 Derivative Liabilities Interest rate contracts: Designated $ 962 $ 792 $ 170 $ — Not designated 50,491 24,579 24,632 1,280 $ 51,453 $ 25,371 $ 24,802 $ 1,280

Commitments, Credit Risk and 31

Commitments, Credit Risk and Contingencies (Tables)	3 Months Ended
	Mar. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Summary of Off-Balance Sheet Credit Risk Information	Following is a summary of off-balance sheet credit risk information: March 31, 2016 December 31, 2015 Commitments to extend credit $ 4,463,138 $ 3,781,719 Standby letters of credit 118,167 92,979

Stock Incentive Plans (Tables)

Stock Incentive Plans (Tables)	3 Months Ended
	Mar. 31, 2016
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: Three Months Ended March 31, 2016 2015 Awards Weighted Average Grant Awards Weighted Average Grant Unvested awards outstanding at beginning of period 1,548,444 $ 12.85 1,354,093 $ 11.86 Net adjustment due to performance — — (46,956 ) 10.25 Vested (363,799 ) 12.07 (458,450 ) 10.60 Forfeited (6,368 ) 12.79 (2,357 ) 17.93 Dividend reinvestment 10,870 11.50 7,656 14.24 Unvested awards outstanding at end of period 1,189,147 13.08 853,986 12.63
Components of Restricted Stock Awards	The components of the restricted stock awards as of March 31, 2016 are as follows: Service- Awards Performance- Based Awards Total Unvested awards 514,702 674,445 1,189,147 Unrecognized compensation expense $ 3,178 $ 4,919 $ 8,097 Intrinsic value $ 6,696 $ 8,775 $ 15,471 Weighted average remaining life (in years) 1.69 2.37 2.08
Summary of Information Concerning Stock Option Awards	The following table summarizes certain information concerning stock option awards: Three Months Ended March 31, 2016 2015 Shares Weighted Average Exercise Price Shares Weighted Average Exercise Price Options outstanding at beginning of period 435,340 $ 8.86 568,834 $ 8.86 Assumed from acquisitions 1,707,036 7.83 — — Exercised (24,806 ) 6.38 (60,094 ) 5.04 Forfeited (92,650 ) 6.69 (2,182 ) 4.34 Options outstanding and exercisable at end of period 2,024,920 8.12 506,558 9.33

Retirement Plans (Tables)

Retirement Plans (Tables)	3 Months Ended
	Mar. 31, 2016
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 March 31, 2016 2015 Service cost $ (4 ) $ 17 Interest cost 1,544 1,477 Expected return on plan assets (2,353 ) (2,491 ) Amortization: Unrecognized prior service cost 2 2 Unrecognized loss 608 536 Net periodic pension credit $ (203 ) $ (459 )

Comprehensive Income (Tables)

Comprehensive Income (Tables)	3 Months Ended
	Mar. 31, 2016
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 March 31, 2016 2015 Net income $ 26,132 $ 40,343 Other comprehensive income: Securities available for sale: Unrealized gains arising during the period, net of tax expense of $7,719 and $4,523 14,335 8,400 Reclassification adjustment for (gains) losses included in net income, net of tax expense of $25 and $(3) (46 ) 6 Derivative instruments: Unrealized gains arising during the period, net of tax expense of $1,693 and $1,504 3,145 2,793 Reclassification adjustment for gains included in net income, net of tax expense of $188 and $283 (349 ) (526 ) Pension and postretirement benefit obligations: Unrealized gains arising during the period, net of tax expense of $214 and $189 397 350 Other comprehensive income 17,482 11,023 Comprehensive income $ 43,614 $ 51,366
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 Three Months Ended March 31, 2016 Balance at beginning of period $ (3,873 ) $ 1,440 $ (48,700 ) $ (51,133 ) Other comprehensive income before reclassifications 14,335 3,145 397 17,877 Amounts reclassified from AOCI (46 ) (349 ) — (395 ) Net current period other comprehensive income 14,289 2,796 397 17,482 Balance at end of period $ 10,416 $ 4,236 $ (48,303 ) $ (33,651 )

Earnings per Common Share (Tabl

Earnings per Common Share (Tables)	3 Months Ended
	Mar. 31, 2016
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 March 31, 2016 2015 Net income $ 26,132 $ 40,343 Less: Preferred stock dividends 2,010 2,010 Net income available to common stockholders $ 24,122 $ 38,333 Basic weighted average common shares outstanding 193,585,702 174,152,283 Net effect of dilutive stock options, warrants, restricted stock and convertible debt 1,292,220 1,673,693 Diluted weighted average common shares outstanding 194,877,922 175,825,976 Earnings per common share: Basic $ 0.12 $ 0.22 Diluted $ 0.12 $ 0.22

Cash Flow Information (Tables)

Cash Flow Information (Tables)	3 Months Ended
	Mar. 31, 2016
Supplemental Cash Flow Elements [Abstract]
Summary of Supplemental Cash Flow Information	Following is a summary of supplemental cash flow information: 2016 2015 Three Months Ended March 31 Interest paid on deposits and other borrowings $ 13,794 $ 11,626 Income taxes paid — — Transfers of loans to other real estate owned 8,049 1,965 Financing of other real estate owned sold 62 166

Business Segments (Tables)

Business Segments (Tables)	3 Months Ended
	Mar. 31, 2016
Segment Reporting [Abstract]
Financial Information for Segments of Corporation	The following tables provide financial information for these segments of the Corporation. The information provided under the caption “Parent and Other” represents operations not considered to be reportable segments and/or general operating expenses of the Corporation, and includes the parent company, other non-bank subsidiaries and eliminations and adjustments which are necessary for purposes of reconciliation to the consolidated amounts. Community Wealth Management Insurance Consumer Parent Consolidated At or for the Three Months Ended March 31, 2016 Interest income $ 143,978 $ — $ 22 $ 9,785 $ 1,969 $ 155,754 Interest expense 12,594 — — 941 1,865 15,400 Net interest income 131,384 — 22 8,844 104 140,354 Provision for credit losses 9,917 — — 1,526 325 11,768 Non-interest income 31,233 8,816 4,194 716 1,085 46,044 Non-interest expense 118,048 7,089 3,301 5,204 357 133,999 Intangible amortization 2,441 65 143 — — 2,649 Income tax expense (benefit) 10,117 605 275 1,112 (259 ) 11,850 Net income (loss) 22,094 1,057 497 1,718 766 26,132 Total assets 20,151,815 20,540 21,680 188,547 (58,058 ) 20,324,524 Total intangibles 1,062,079 10,383 12,779 1,809 — 1,087,050 Community Wealth Management Insurance Consumer Parent Consolidated At or for the Three Months Ended March 31, 2015 Interest income $ 122,118 $ — $ 23 $ 9,593 $ 1,635 $ 133,369 Interest expense 9,941 — — 860 647 11,448 Net interest income 112,177 — 23 8,733 988 121,921 Provision for credit losses 6,327 — — 1,574 235 8,136 Non-interest income 27,301 8,387 3,593 676 (1,775 ) 38,182 Non-interest expense 77,079 6,493 4,170 4,808 (10 ) 92,540 Intangible amortization 1,947 68 100 — — 2,115 Income tax expense (benefit) 15,931 658 (226 ) 1,149 (543 ) 16,969 Net income (loss) 38,194 1,168 (428 ) 1,878 (469 ) 40,343 Total assets 16,100,851 21,125 18,464 182,662 (44,254 ) 16,278,848 Total intangibles 852,764 10,652 10,021 1,809 — 875,246

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2016
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 March 31, 2016 Assets Measured at Fair Value Available for sale debt securities: U.S. Treasury $ — $ 29,994 $ — $ 29,994 U.S. government-sponsored entities — 401,078 — 401,078 Residential mortgage-backed securities: Agency mortgage-backed securities — 1,087,865 — 1,087,865 Agency collateralized mortgage obligations — 525,630 — 525,630 Non-agency collateralized mortgage obligations — 5 1,091 1,096 Commercial mortgage-backed securities — 3,673 — 3,673 States of the U.S. and political subdivisions — 39,804 — 39,804 Other debt securities — 8,908 — 8,908 — 2,096,957 1,091 2,098,048 Available for sale equity securities: Financial services industry 102 636 424 1,162 Insurance services industry 133 — — 133 235 636 424 1,295 235 2,097,593 1,515 2,099,343 Derivative financial instruments: Trading — 80,125 — 80,125 Not for trading — 7,881 — 7,881 — 88,006 — 88,006 $ 235 $ 2,185,599 $ 1,515 $ 2,187,349 Liabilities Measured at Fair Value Derivative financial instruments: Trading — $ 80,659 — $ 80,659 Not for trading — 1,560 — 1,560 — $ 82,219 — $ 82,219 Level 1 Level 2 Level 3 Total December 31, 2015 Assets Measured at Fair Value Available for sale debt securities: U.S. Treasury $ — $ 29,796 $ — $ 29,796 U.S. government-sponsored entities — 367,994 — 367,994 Residential mortgage-backed securities: Agency mortgage-backed securities — 704,831 — 704,831 Agency collateralized mortgage obligations — 495,830 — 495,830 Non-agency collateralized mortgage obligations — 6 1,184 1,190 Commercial mortgage-backed securities — 4,287 — 4,287 States of the U.S. and political subdivisions — 11,057 — 11,057 Other debt securities — 14,286 — 14,286 — 1,628,087 1,184 1,629,271 Available for sale equity securities: Financial services industry 97 632 439 1,168 Insurance services industry 128 — — 128 225 632 439 1,296 225 1,628,719 1,623 1,630,567 Derivative financial instruments: Trading — 50,017 — 50,017 Not for trading — 3,185 — 3,185 — 53,202 — 53,202 $ 225 $ 1,681,921 $ 1,623 $ 1,683,769 Liabilities Measured at Fair Value Derivative financial instruments: Trading — $ 50,510 — $ 50,510 Not for trading — 1,095 — 1,095 — $ 51,605 — $ 51,605
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: Equity Residential Non-Agency Collateralized Mortgage Obligations Total Three Months Ended March 31, 2016 Balance at beginning of period $ 439 $ 1,184 $ 1,623 Total gains (losses) – realized/unrealized: Included in earnings — — — Included in other comprehensive income (15 ) (28 ) (43 ) Accretion included in earnings — 2 2 Purchases, issuances, sales and settlements: Purchases — — — Issuances — — — Sales/redemptions — — — Settlements — (67 ) (67 ) Transfers from Level 3 — — — Transfers into Level 3 — — — Balance at end of period $ 424 $ 1,091 $ 1,515 Year Ended December 31, 2015 Balance at beginning of period $ 475 $ 1,420 $ 1,895 Total gains (losses) – realized/unrealized: Included in earnings — — — Included in other comprehensive income 20 (4 ) 16 Accretion included in earnings — 5 5 Purchases, issuances, sales and settlements: Purchases — — — Issuances — — — Sales/redemptions — — — Settlements — (237 ) (237 ) Transfers from Level 3 (56 ) — (56 ) Transfers into Level 3 — — — Balance at end of period $ 439 $ 1,184 $ 1,623
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 March 31, 2016 Impaired loans — $ 957 $ 7,257 $ 8,214 Other real estate owned — 1,148 868 2,016 December 31, 2015 Impaired loans — 124 3,704 3,828 Other real estate owned — 5,705 2,126 7,831
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 March 31, 2016 Financial Assets Cash and cash equivalents $ 345,945 $ 345,945 $ 345,945 $ — $ — Securities available for sale 2,099,343 2,099,343 235 2,097,593 1,515 Securities held to maturity 1,776,020 1,803,453 — 1,801,022 2,431 Net loans and leases, including loans held for sale 14,025,482 13,969,315 — — 13,969,315 Derivative assets 88,006 88,006 — 88,006 — Accrued interest receivable 53,609 53,609 53,609 — — Financial Liabilities Deposits 15,390,483 15,397,218 12,700,899 2,696,319 — Short-term borrowings 1,563,888 1,563,947 1,563,947 — — Long-term borrowings 657,445 656,929 — — 656,929 Derivative liabilities 82,219 82,219 — 82,219 — Accrued interest payable 9,063 9,063 9,063 — — Carrying Fair Value Measurements Amount Fair Value Level 1 Level 2 Level 3 December 31, 2015 Financial Assets Cash and cash equivalents $ 489,119 $ 489,119 $ 489,119 $ — $ — Securities available for sale 1,630,567 1,630,567 225 1,628,719 1,623 Securities held to maturity 1,637,061 1,643,416 — 1,640,721 2,695 Net loans and leases, including loans held for sale 12,053,209 11,863,882 — — 11,863,882 Derivative assets 53,202 53,202 — 53,202 — Accrued interest receivable 44,920 44,920 44,920 — — Financial Liabilities Deposits 12,623,463 12,610,914 10,157,997 2,452,917 — Short-term borrowings 2,048,896 2,048,943 2,048,943 — — Long-term borrowings 641,480 637,935 — — 637,935 Derivative liabilities 51,605 51,605 — 51,605 — Accrued interest payable 7,457 7,457 7,457 — —

Nature of Operations (Additiona

Nature of Operations (Additional Information) (Detail)	3 Months Ended
	Mar. 31, 2016StateOfficeLocation
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of states, Company operating financial services | State	6
Number of metropolitan areas, Company operating financial services | Location	3
Number of consumer finance offices	76
Number of banking offices	317

Mergers and Acquisitions - Addi

Mergers and Acquisitions - Additional Information (Detail) $ in Thousands	Apr. 22, 2016USD ($)Branch	Feb. 13, 2016USD ($)shares	Sep. 18, 2015USD ($)Branch	Mar. 31, 2016USD ($)	Dec. 31, 2015USD ($)
Business Acquisition [Line Items]
Number of branch-banking locations acquired | Branch			5
Deposits acquired as a result of merger			$ 154,619
Goodwill recorded as a result of merger				$ 1,006,934	$ 833,086
Assets acquired as a result of merger			154,619
Merger-related expenses				24,940
Cash acquired as a result of merger			148,159
Goodwill and intangible assets acquired as a result of merger			4,485
Fixed and other assets acquired as a result of merger			$ 1,975
Percentage of premium on acquired loan			1.94%
Goodwill deductible for tax purposes			$ 1,485
Metro Bancorp Inc [Member]
Business Acquisition [Line Items]
Loans acquired as a result of merger		$ 1,869,046
Deposits acquired as a result of merger		2,327,219
Goodwill recorded as a result of merger		173,848
Core deposit intangibles recorded as result of the acquisition		36,801
Value of acquisition		$ 404,020
Common shares issued | shares		34,041,181
Common shares acquired | shares		14,345,319
Assets acquired as a result of merger		$ 2,797,199
Merger-related expenses				24,577
Issuance costs incurred in connection with acquisition				$ 743
Cash acquired as a result of merger		$ 46,854
Metro Bancorp Inc [Member] | Merger - Related Expenses [Member]
Business Acquisition [Line Items]
Severance costs				50.90%
Fifth Third Bank [Member] | Subsequent Event [Member]
Business Acquisition [Line Items]
Number of branch-banking locations acquired | Branch	17
Loans acquired as a result of merger	$ 99,500
Deposits acquired as a result of merger	302,000
Goodwill recorded as a result of merger	10,798
Core deposit intangibles recorded as result of the acquisition	$ 5,200

Mergers and Acquisitions - Busi

Mergers and Acquisitions - Business Acquisition Pro Forma Information (Detail) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2016USD ($)$ / shares
Business Acquisition Pro Forma Information [Line Items]
Revenue (net interest income and non-interest income)	$ 192,668
Net income	44,062
Net income available to common stockholders	$ 42,052
Earnings per common share - basic | $ / shares	$ 0.20
Earnings per common share - diluted | $ / shares	$ 0.20
F.N.B. Corporation [Member]
Business Acquisition Pro Forma Information [Line Items]
Revenue (net interest income and non-interest income)	$ 160,103
Net income	40,343
Net income available to common stockholders	$ 38,333
Earnings per common share - basic | $ / shares	$ 0.22
Earnings per common share - diluted | $ / shares	$ 0.22
Metro Bancorp Inc [Member]
Business Acquisition Pro Forma Information [Line Items]
Revenue (net interest income and non-interest income)	$ 33,626
Net income	5,722
Net income available to common stockholders	$ 5,702
Earnings per common share - basic | $ / shares	$ 0.40
Earnings per common share - diluted | $ / shares	$ 0.39
Proforma Adjustments [Member]
Business Acquisition Pro Forma Information [Line Items]
Revenue (net interest income and non-interest income)	$ (1,061)
Net income	(2,003)
Net income available to common stockholders	$ (1,983)

Mergers and Acquisitions - Amou

Mergers and Acquisitions - Amounts Recorded on Consolidated Balance Sheet in Conjunction with Acquisition (Detail) - USD ($) $ in Thousands	Feb. 13, 2016	Sep. 18, 2015
Business Acquisition [Line Items]
Cash and cash equivalents		$ 148,159
Total identifiable assets acquired		154,619
Deposits		154,619
Metro Bancorp Inc [Member]
Business Acquisition [Line Items]
Fair value of consideration paid	$ 404,020
Cash and cash equivalents	46,854
Securities	722,980
Loans	1,869,046
Other intangible assets	36,801
Other assets	121,518
Total identifiable assets acquired	2,797,199
Deposits	2,327,219
Borrowings	227,539
Other liabilities	12,269
Total liabilities assumed	2,567,027
Fair value of net identifiable assets acquired	230,172
Goodwill recognized	$ 173,848
Bank of America [Member]
Business Acquisition [Line Items]
Cash and cash equivalents		148,159
Loans		842
Other intangible assets		3,000
Other assets		1,133
Total identifiable assets acquired		153,134
Deposits		154,619
Total liabilities assumed		154,619
Fair value of net identifiable assets acquired		(1,485)
Goodwill recognized		$ 1,485

Securities - Schedule of Amorti

Securities - Schedule of Amortized Cost and Fair Value of Securities Available for Sale (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Securities Available For Sale, Amortized Cost	$ 2,083,319	$ 1,636,526
Securities Available For Sale, Gross Unrealized Gains	20,123	7,394
Securities Available For Sale, Gross Unrealized Losses	(4,099)	(13,353)
Securities Available For Sale, Fair Value	2,099,343	1,630,567
U.S. Treasury [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available For Sale, Amortized Cost	29,771	29,738
Securities Available For Sale, Gross Unrealized Gains	223	58
Securities Available For Sale, Fair Value	29,994	29,796
U.S. Government-Sponsored Entities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available For Sale, Amortized Cost	398,497	368,463
Securities Available For Sale, Gross Unrealized Gains	2,617	856
Securities Available For Sale, Gross Unrealized Losses	(36)	(1,325)
Securities Available For Sale, Fair Value	401,078	367,994
Agency Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available For Sale, Amortized Cost	1,075,195	703,069
Securities Available For Sale, Gross Unrealized Gains	12,691	4,594
Securities Available For Sale, Gross Unrealized Losses	(21)	(2,832)
Securities Available For Sale, Fair Value	1,087,865	704,831
Securities Available For Sale, Fair Value	1,087,865
Agency Collateralized Mortgage Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available For Sale, Amortized Cost	524,722	503,328
Securities Available For Sale, Gross Unrealized Gains	3,812	1,032
Securities Available For Sale, Gross Unrealized Losses	(2,904)	(8,530)
Securities Available For Sale, Fair Value	525,630	495,830
Securities Available For Sale, Fair Value	525,630
Non-Agency Collateralized Mortgage Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available For Sale, Amortized Cost	1,111	1,177
Securities Available For Sale, Gross Unrealized Gains		13
Securities Available For Sale, Gross Unrealized Losses	(15)
Securities Available For Sale, Fair Value	1,096	1,190
Securities Available For Sale, Fair Value	1,096
Commercial Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available For Sale, Amortized Cost	3,674	4,299
Securities Available For Sale, Gross Unrealized Losses	(1)	(12)
Securities Available For Sale, Fair Value	3,673	4,287
Securities Available For Sale, Fair Value	3,673
States of the U.S. and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available For Sale, Amortized Cost	39,620	10,748
Securities Available For Sale, Gross Unrealized Gains	283	309
Securities Available For Sale, Gross Unrealized Losses	(99)
Securities Available For Sale, Fair Value	39,804	11,057
Other Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available For Sale, Amortized Cost	9,754	14,729
Securities Available For Sale, Gross Unrealized Gains	177	208
Securities Available For Sale, Gross Unrealized Losses	(1,023)	(651)
Securities Available For Sale, Fair Value	8,908	14,286
Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available For Sale, Amortized Cost	2,082,344	1,635,551
Securities Available For Sale, Gross Unrealized Gains	19,803	7,070
Securities Available For Sale, Gross Unrealized Losses	(4,099)	(13,350)
Securities Available For Sale, Fair Value	2,098,048	1,629,271
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available For Sale, Amortized Cost	975	975
Securities Available For Sale, Gross Unrealized Gains	320	324
Securities Available For Sale, Gross Unrealized Losses		(3)
Securities Available For Sale, Fair Value	1,295	$ 1,296
Securities Available For Sale, Fair Value	$ 1,295

Securities - Schedule of Amor44

Securities - Schedule of Amortized Cost and Fair Value of Securities Held to Maturity (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Investment Securities Held To Maturity [Line Items]
Securities Held To Maturity, Amortized Cost	$ 1,776,020	$ 1,637,061
Securities Held To Maturity, Gross Unrealized Gains	30,643	15,943
Securities Held To Maturity, Gross Unrealized Losses	(3,210)	(9,588)
Securities held to maturity, fair value	1,803,453	1,643,416
U.S. Treasury [Member]
Investment Securities Held To Maturity [Line Items]
Securities Held To Maturity, Amortized Cost	500	500
Securities Held To Maturity, Gross Unrealized Gains	184	153
Securities held to maturity, fair value	684	653
U.S. Government-Sponsored Entities [Member]
Investment Securities Held To Maturity [Line Items]
Securities Held To Maturity, Amortized Cost	122,333	137,385
Securities Held To Maturity, Gross Unrealized Gains	1,606	809
Securities Held To Maturity, Gross Unrealized Losses		(395)
Securities held to maturity, fair value	123,939	137,799
Agency Mortgage-Backed Securities [Member]
Investment Securities Held To Maturity [Line Items]
Securities Held To Maturity, Amortized Cost	830,640	709,970
Securities Held To Maturity, Gross Unrealized Gains	18,063	9,858
Securities Held To Maturity, Gross Unrealized Losses	(4)	(1,176)
Securities held to maturity, fair value	848,699	718,652
Agency Collateralized Mortgage Obligations [Member]
Investment Securities Held To Maturity [Line Items]
Securities Held To Maturity, Amortized Cost	520,576	499,694
Securities Held To Maturity, Gross Unrealized Gains	4,123	803
Securities Held To Maturity, Gross Unrealized Losses	(2,931)	(7,657)
Securities held to maturity, fair value	521,768	492,840
Non-Agency Collateralized Mortgage Obligations [Member]
Investment Securities Held To Maturity [Line Items]
Securities Held To Maturity, Amortized Cost	2,436	2,681
Securities Held To Maturity, Gross Unrealized Gains	4	14
Securities Held To Maturity, Gross Unrealized Losses	(9)
Securities held to maturity, fair value	2,431	2,695
Commercial Mortgage-Backed Securities [Member]
Investment Securities Held To Maturity [Line Items]
Securities Held To Maturity, Amortized Cost	50,526	51,258
Securities Held To Maturity, Gross Unrealized Gains	1,222	115
Securities Held To Maturity, Gross Unrealized Losses	(92)	(259)
Securities held to maturity, fair value	51,656	51,114
States of the U.S. and Political Subdivisions [Member]
Investment Securities Held To Maturity [Line Items]
Securities Held To Maturity, Amortized Cost	249,009	235,573
Securities Held To Maturity, Gross Unrealized Gains	5,441	4,191
Securities Held To Maturity, Gross Unrealized Losses	(174)	(101)
Securities held to maturity, fair value	$ 254,276	$ 239,663

Securities - Gross Gains and Gr

Securities - Gross Gains and Gross Losses Realized on Sales of Securities (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Gross gains	$ 71
Gross losses		$ (9)
Total	$ 71	$ (9)

Securities - Amortized Cost and

Securities - Amortized Cost and Fair Value of Securities, by Contractual Maturities (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Schedule Of Securities [Line Items]
Available for Sale, Due in one year or less, Amortized Cost	$ 179
Available for Sale, Due from one to five years, Amortized Cost	441,067
Available for Sale, Due from five to ten years, Amortized Cost	29,112
Available for Sale, Due after ten years, Amortized Cost	7,284
Available for Sale, with contractual maturities, Amortized Cost	477,642
Total securities available for sale, Amortized Cost	2,083,319	$ 1,636,526
Available for Sale, Due in one year or less, Fair Value	180
Available for Sale, Due from one to five years, Fair Value	444,025
Available for Sale, Due from five to ten years, Fair Value	29,332
Available for Sale, Due after ten years, Fair Value	6,247
Available for Sale, with contractual maturities, Fair Value	479,784
Total available for sale Securities, Fair Value	2,099,343	1,630,567
Held to Maturity, Due in one year or less, Amortized Cost	12,126
Held to Maturity, Due from one to five years, Amortized Cost	114,319
Held to Maturity, Due from five to ten years, Amortized Cost	53,587
Held to Maturity, Due after ten years, Amortized Cost	191,810
Securities Held To Maturity, with contractual maturities, Amortized Cost	371,842
Held to Maturity, with contractual maturities, Amortized Cost	1,776,020	1,637,061
Held to Maturity, Due in one year or less, Fair Value	12,140
Held to Maturity, Due from one to five years, Fair Value	115,578
Held to Maturity, Due from five to ten years, Fair Value	54,986
Held to Maturity, Due after ten years, Fair Value	196,195
Securities Held To Maturity, with contractual maturities, Fair Value	378,899
Held to Maturity, with contractual maturities, Fair Value	1,803,453	1,643,416
Agency Mortgage-Backed Securities [Member]
Schedule Of Securities [Line Items]
Total securities available for sale, Amortized Cost	1,075,195	703,069
Total available for sale Securities, Fair Value	1,087,865
Held to Maturity, with contractual maturities, Amortized Cost	830,640	709,970
Held to Maturity, with contractual maturities, Fair Value	848,699	718,652
Agency Collateralized Mortgage Obligations [Member]
Schedule Of Securities [Line Items]
Total securities available for sale, Amortized Cost	524,722	503,328
Total available for sale Securities, Fair Value	525,630
Held to Maturity, with contractual maturities, Amortized Cost	520,576	499,694
Held to Maturity, with contractual maturities, Fair Value	521,768	492,840
Non-Agency Collateralized Mortgage Obligations [Member]
Schedule Of Securities [Line Items]
Total securities available for sale, Amortized Cost	1,111	1,177
Total available for sale Securities, Fair Value	1,096
Held to Maturity, with contractual maturities, Amortized Cost	2,436	2,681
Held to Maturity, with contractual maturities, Fair Value	2,431	2,695
Commercial Mortgage-Backed Securities [Member]
Schedule Of Securities [Line Items]
Total securities available for sale, Amortized Cost	3,674	4,299
Total available for sale Securities, Fair Value	3,673
Held to Maturity, with contractual maturities, Amortized Cost	50,526	51,258
Held to Maturity, with contractual maturities, Fair Value	51,656	51,114
Equity Securities [Member]
Schedule Of Securities [Line Items]
Total securities available for sale, Amortized Cost	975	$ 975
Total available for sale Securities, Fair Value	$ 1,295

Securities - Additional Informa

Securities - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Schedule Of Securities [Line Items]
Securities pledged to secure public deposits, trust deposits and for other purposes, carrying value	$ 2,472,531,000		$ 1,728,939,000
Securities pledged as collateral for short-term borrowings, carrying value	$ 361,338,000		$ 272,629,000
Percentage of securities held as collateral at fair value	73.10%		61.30%
Impairment losses on securities	$ 0	$ 0
Municipal bond portfolio, carrying amount	$ 288,813,000
Percentage of formal credit enhancement insurance of municipalities	81.00%
Municipal Bonds [Member] | Weighted Average [Member]
Schedule Of Securities [Line Items]
Average holding size of securities in bond portfolio	$ 1,730,000
Municipal Bonds [Member] | Credit Concentration Risk [Member] | General Obligation Bonds [Member]
Schedule Of Securities [Line Items]
Percentage of portfolio	99.80%
Municipal Bonds [Member] | Credit Concentration Risk [Member] | General Obligation Bonds [Member] | A Rating [Member] | Minimum [Member]
Schedule Of Securities [Line Items]
Percentage of portfolio	97.00%
Municipal Bonds [Member] | Geographic Concentration Risk [Member] | Pennsylvania, Ohio and Maryland [Member]
Schedule Of Securities [Line Items]
Percentage of portfolio	94.80%

Securities - Summaries of Fair

Securities - Summaries of Fair Values and Unrealized Losses of Securities, Segregated by Length of Impairment (Detail) $ in Thousands	Mar. 31, 2016USD ($)Security	Dec. 31, 2015USD ($)Security
Schedule Of Securities [Line Items]
Number of available for sale securities, Less than 1 year | Security	24	36
Number of available for sale securities, Greater than 1 year | Security	18	23
Number of available for sale securities | Security	42	59
Securities Available For Sale, Less than 12 Months, Fair Value	$ 130,237	$ 589,609
Securities Available For Sale, Less than 12 Months, Unrealized Losses	(200)	(5,027)
Securities Available For Sale, 12 Months or More, Fair Value	179,229	254,062
Securities Available For Sale, 12 Months or More, Unrealized Losses	(3,899)	(8,326)
Securities Available For Sale, Fair Value, Total	309,466	843,671
Securities Available For Sale, Unrealized Losses, Total	$ (4,099)	$ (13,353)
Number of held to maturity securities | Security	26	59
Securities Held To Maturity, Less than 12 Months, Fair Value	$ 20,802	$ 466,354
Securities Held To Maturity, Less than 12 Months, Unrealized Losses	(278)	(3,126)
Securities Held To Maturity, Greater than 12 Months, Fair Value	183,968	176,411
Securities Held To Maturity, Greater than 12 Months, Unrealized Losses	(2,932)	(6,462)
Securities Held To Maturity, Fair Value, Total	204,770	642,765
Securities Held To Maturity, Unrealized Losses, Total	$ (3,210)	$ (9,588)
Less than 12 Months [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities | Security	9	43
Greater than 12 Months [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities | Security	17	16
U.S. Government-Sponsored Entities [Member]
Schedule Of Securities [Line Items]
Number of available for sale securities, Less than 1 year | Security	2	6
Number of available for sale securities, Greater than 1 year | Security		2
Number of available for sale securities | Security	2	8
Securities Available For Sale, Less than 12 Months, Fair Value	$ 17,960	$ 99,131
Securities Available For Sale, Less than 12 Months, Unrealized Losses	(36)	(814)
Securities Available For Sale, 12 Months or More, Fair Value		34,487
Securities Available For Sale, 12 Months or More, Unrealized Losses		(511)
Securities Available For Sale, Fair Value, Total	17,960	133,618
Securities Available For Sale, Unrealized Losses, Total	$ (36)	$ (1,325)
Number of held to maturity securities | Security		4
Securities Held To Maturity, Less than 12 Months, Fair Value		$ 39,843
Securities Held To Maturity, Less than 12 Months, Unrealized Losses		(173)
Securities Held To Maturity, Greater than 12 Months, Fair Value		14,778
Securities Held To Maturity, Greater than 12 Months, Unrealized Losses		(222)
Securities Held To Maturity, Fair Value, Total		54,621
Securities Held To Maturity, Unrealized Losses, Total		$ (395)
U.S. Government-Sponsored Entities [Member] | Less than 12 Months [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities | Security		3
U.S. Government-Sponsored Entities [Member] | Greater than 12 Months [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities | Security		1
Agency Mortgage-Backed Securities [Member]
Schedule Of Securities [Line Items]
Number of available for sale securities, Less than 1 year | Security	2	19
Number of available for sale securities | Security	2	19
Securities Available For Sale, Less than 12 Months, Fair Value	$ 56,402	$ 359,250
Securities Available For Sale, Less than 12 Months, Unrealized Losses	(21)	(2,832)
Securities Available For Sale, Fair Value, Total	56,402	359,250
Securities Available For Sale, Unrealized Losses, Total	$ (21)	$ (2,832)
Number of held to maturity securities | Security	1	18
Securities Held To Maturity, Less than 12 Months, Fair Value	$ 922	$ 212,024
Securities Held To Maturity, Less than 12 Months, Unrealized Losses	(4)	(1,159)
Securities Held To Maturity, Greater than 12 Months, Fair Value		917
Securities Held To Maturity, Greater than 12 Months, Unrealized Losses		(17)
Securities Held To Maturity, Fair Value, Total	922	212,941
Securities Held To Maturity, Unrealized Losses, Total	$ (4)	$ (1,176)
Agency Mortgage-Backed Securities [Member] | Less than 12 Months [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities | Security	1	17
Agency Mortgage-Backed Securities [Member] | Greater than 12 Months [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities | Security		1
Agency Collateralized Mortgage Obligations [Member]
Schedule Of Securities [Line Items]
Number of available for sale securities, Less than 1 year | Security	2	9
Number of available for sale securities, Greater than 1 year | Security	15	18
Number of available for sale securities | Security	17	27
Securities Available For Sale, Less than 12 Months, Fair Value	$ 29,786	$ 126,309
Securities Available For Sale, Less than 12 Months, Unrealized Losses	(28)	(1,366)
Securities Available For Sale, 12 Months or More, Fair Value	175,354	215,330
Securities Available For Sale, 12 Months or More, Unrealized Losses	(2,876)	(7,164)
Securities Available For Sale, Fair Value, Total	205,140	341,639
Securities Available For Sale, Unrealized Losses, Total	$ (2,904)	$ (8,530)
Number of held to maturity securities | Security	16	25
Securities Held To Maturity, Less than 12 Months, Fair Value		$ 150,593
Securities Held To Maturity, Less than 12 Months, Unrealized Losses		(1,434)
Securities Held To Maturity, Greater than 12 Months, Fair Value	$ 181,913	160,716
Securities Held To Maturity, Greater than 12 Months, Unrealized Losses	(2,931)	(6,223)
Securities Held To Maturity, Fair Value, Total	181,913	311,309
Securities Held To Maturity, Unrealized Losses, Total	$ (2,931)	$ (7,657)
Agency Collateralized Mortgage Obligations [Member] | Less than 12 Months [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities | Security		11
Agency Collateralized Mortgage Obligations [Member] | Greater than 12 Months [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities | Security	16	14
Non-Agency Collateralized Mortgage Obligations [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	$ 1,091
Securities Available For Sale, Less than 12 Months, Unrealized Losses	(15)
Securities Available For Sale, Fair Value, Total	1,091
Securities Available For Sale, Unrealized Losses, Total	$ (15)
Number of held to maturity securities | Security	2
Securities Held To Maturity, Less than 12 Months, Fair Value	$ 1,294
Securities Held To Maturity, Less than 12 Months, Unrealized Losses	(9)
Securities Held To Maturity, Fair Value, Total	1,294
Securities Held To Maturity, Unrealized Losses, Total	$ (9)
Non-Agency Collateralized Mortgage Obligations [Member] | Less than 12 Months [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities | Security	2
Commercial Mortgage-Backed Securities [Member]
Schedule Of Securities [Line Items]
Number of available for sale securities, Less than 1 year | Security	1	1
Number of available for sale securities | Security	1	1
Securities Available For Sale, Less than 12 Months, Fair Value	$ 3,673	$ 4,287
Securities Available For Sale, Less than 12 Months, Unrealized Losses	(1)	(12)
Securities Available For Sale, Fair Value, Total	3,673	4,287
Securities Available For Sale, Unrealized Losses, Total	$ (1)	$ (12)
Number of held to maturity securities | Security	1	3
Securities Held To Maturity, Less than 12 Months, Fair Value	$ 8,579	$ 46,278
Securities Held To Maturity, Less than 12 Months, Unrealized Losses	(92)	(259)
Securities Held To Maturity, Fair Value, Total	8,579	46,278
Securities Held To Maturity, Unrealized Losses, Total	$ (92)	$ (259)
Commercial Mortgage-Backed Securities [Member] | Less than 12 Months [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities | Security	1	3
States of the U.S. and Political Subdivisions [Member]
Schedule Of Securities [Line Items]
Number of available for sale securities, Less than 1 year | Security	16
Number of available for sale securities | Security	16
Securities Available For Sale, Less than 12 Months, Fair Value	$ 21,325
Securities Available For Sale, Less than 12 Months, Unrealized Losses	(99)
Securities Available For Sale, Fair Value, Total	21,325
Securities Available For Sale, Unrealized Losses, Total	$ (99)
Number of held to maturity securities | Security	6	9
Securities Held To Maturity, Less than 12 Months, Fair Value	$ 10,007	$ 17,616
Securities Held To Maturity, Less than 12 Months, Unrealized Losses	(173)	(101)
Securities Held To Maturity, Greater than 12 Months, Fair Value	2,055
Securities Held To Maturity, Greater than 12 Months, Unrealized Losses	(1)
Securities Held To Maturity, Fair Value, Total	12,062	17,616
Securities Held To Maturity, Unrealized Losses, Total	$ (174)	$ (101)
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	5	9
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	1
Other Securities [Member]
Schedule Of Securities [Line Items]
Number of available for sale securities, Greater than 1 year | Security	3	3
Number of available for sale securities | Security	3	3
Securities Available For Sale, 12 Months or More, Fair Value	$ 3,875	$ 4,245
Securities Available For Sale, 12 Months or More, Unrealized Losses	(1,023)	(651)
Securities Available For Sale, Fair Value, Total	3,875	4,245
Securities Available For Sale, Unrealized Losses, Total	$ (1,023)	$ (651)
Equity Securities [Member]
Schedule Of Securities [Line Items]
Number of available for sale securities, Less than 1 year | Security		1
Number of available for sale securities | Security		1
Securities Available For Sale, Less than 12 Months, Fair Value		$ 632
Securities Available For Sale, Less than 12 Months, Unrealized Losses		(3)
Securities Available For Sale, Fair Value, Total		632
Securities Available For Sale, Unrealized Losses, Total		$ (3)

Securities - Summary of Cumulat

Securities - Summary of Cumulative Credit-Related OTTI Charges (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
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
Reduction due to credit impaired securities sold	0	0
Ending balance	27	27
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
Reduction due to credit impaired securities sold	0	0
Ending balance	$ 27	$ 27

Loans and Leases - Summary of L

Loans and Leases - Summary of Loans and Leases, Net of Unearned Income (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	$ 14,165,599	$ 12,190,440
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	5,253,660	4,109,056
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	3,046,267	2,601,722
Commercial Leases [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	202,605	204,553
Total Commercial Loans and Leases [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	8,502,532	6,915,331
Direct Installment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	1,790,802	1,706,636
Residential Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	1,531,379	1,395,971
Indirect Installment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	1,025,727	996,729
Consumer Lines of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	1,261,493	1,137,255
Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	53,666	38,518
Originated Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	11,287,704	11,031,979
Originated Loans [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	3,605,301	3,531,146
Originated Loans [Member] | Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	2,574,321	2,534,351
Originated Loans [Member] | Commercial Leases [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	202,605	204,553
Originated Loans [Member] | Total Commercial Loans and Leases [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	6,382,227	6,270,050
Originated Loans [Member] | Direct Installment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	1,686,037	1,660,717
Originated Loans [Member] | Residential Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	1,105,680	1,044,689
Originated Loans [Member] | Indirect Installment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	1,025,413	996,175
Originated Loans [Member] | Consumer Lines of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	1,034,681	1,021,830
Originated Loans [Member] | Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	53,666	38,518
Acquired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	2,877,895	1,158,461
Acquired Loans [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	1,648,359	577,910
Acquired Loans [Member] | Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	471,946	67,371
Acquired Loans [Member] | Total Commercial Loans and Leases [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	2,120,305	645,281
Acquired Loans [Member] | Direct Installment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	104,765	45,919
Acquired Loans [Member] | Residential Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	425,699	351,282
Acquired Loans [Member] | Indirect Installment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	314	554
Acquired Loans [Member] | Consumer Lines of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	$ 226,812	$ 115,425

Loans and Leases - Additional I

Loans and Leases - Additional Information (Detail) - USD ($)	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Feb. 13, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Consumer loans	$ 180,889,000	$ 186,162,000	$ 180,889,000		$ 186,162,000
Commercial construction loans	458,388,000	352,322,000	458,388,000		352,322,000
Carrying amount	14,165,599,000	12,190,440,000	$ 14,165,599,000		12,190,440,000
Loans acquired and accounted for under ASC 310-30, Fair value						$ 1,588,481,000
Loans acquired and accounted for under ASC 310-30, Contractual cash flows not expected to be collected						2,174,234,000
Sustained period of delinquency for impairment evaluation			90 days	90 days
Minimum reserves for commercial loan	500,000		$ 500,000
Minimum amount to allocate specific valuation allowance	500,000		500,000
Allowance for loan losses			5,580,000		6,727,000
Restructured loans returned to performing status			2,488,000
Valuation for impairment of loans with pooled reserves	500,000	500,000	500,000		500,000
Pooled reserves for all other classes of loans			3,405,000		3,515,000
Loan Purchased not Subject to ASC 310-30 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans acquired and accounted for under ASC 310-30, Fair value						273,966,000
Loans acquired and accounted for under ASC 310-30, Unpaid principal balance						296,484,000
Loans acquired and accounted for under ASC 310-30, Contractual cash flows not expected to be collected						$ 98,021,000
Consumer Lines of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount	1,261,493,000	1,137,255,000	1,261,493,000		1,137,255,000
Allowance for loan losses			229,000		522,000
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount	5,253,660,000	4,109,056,000	5,253,660,000		4,109,056,000
Allowance for loan losses			2,821,000		3,073,000
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount	3,046,267,000	2,601,722,000	3,046,267,000		2,601,722,000
Allowance for loan losses			499,000		695,000
Direct Installment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount	1,790,802,000	1,706,636,000	1,790,802,000		1,706,636,000
Allowance for loan losses			1,322,000		1,557,000
Residential Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount	1,531,379,000	1,395,971,000	1,531,379,000		1,395,971,000
Allowance for loan losses			487,000		659,000
Indirect Installment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount	1,025,727,000	996,729,000	1,025,727,000		996,729,000
Allowance for loan losses			222,000		221,000
Purchased Credit-Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount	17,161,000	5,940,000	17,161,000		5,940,000
Specific reserves for commercial TDRs [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Reserves in allowance for loan losses, TDRs	298,000	300,000	298,000		300,000
Pooled reserves for commercial TDRs [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Reserves in allowance for loan losses, TDRs	$ 865,000	$ 929,000	$ 865,000		$ 929,000
Loan Portfolio Diversification Risk [Member] | Loans and Leases Receivable Net of Deferred Income [Member] | Construction Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of portfolio			3.20%		2.90%
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			1.30%		1.50%
Loan Portfolio Diversification Risk [Member] | Commercial Real Estate Loans [Member] | Owner-Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of portfolio			38.20%		38.10%
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			61.80%		61.90%
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%	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	$ 4,590,000	$ 5,219,000	$ 4,590,000		$ 5,219,000
Mortgage loans on real estate, foreclosure			$ 10,174,000		$ 11,725,000

Loans and Leases - Summary of O

Loans and Leases - Summary of Outstanding Principal Balance and Carrying Amount of Acquired Loans (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount	$ 14,165,599	$ 12,190,440
Accounted for under ASC 310-30 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	2,849,661	1,258,418
Carrying amount	2,485,752	1,011,139
Accounted for under ASC 310-20 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	403,252	146,161
Carrying amount	386,564	140,595
Acquired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	3,252,913	1,404,579
Carrying amount	$ 2,872,316	$ 1,151,734

Loans and Leases - Summary of C

Loans and Leases - Summary of Change in Accretable Yield of Acquired Loans (Detail) - USD ($) $ in Thousands	Feb. 13, 2016	Mar. 31, 2016	Mar. 31, 2015
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period [Abstract]
Balance at beginning of period		$ 256,120	$ 331,899
Acquisitions		284,092
Reduction due to unexpected early payoffs		(9,375)	(11,909)
Reclass from non-accretable difference		10,494	7,676
Disposals/transfers		(260)	(118)
Accretion	$ (284,092)	(13,204)	(16,264)
Balance at end of period		$ 527,867	$ 311,284

Loans and Leases - Summary of A

Loans and Leases - Summary of Acquisition of Purchased Loans (Detail) - USD ($) $ in Thousands	Feb. 13, 2016	Mar. 31, 2016	Mar. 31, 2015
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Contractually required cash flows at acquisition	$ 2,174,234
Non-accretable difference (expected losses and foregone interest)	(301,661)
Cash flows expected to be collected at acquisition	1,872,573
Accretable yield	(284,092)	$ (13,204)	$ (16,264)
Basis in acquired loans at acquisition	1,588,481
Acquired Impaired Loans [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Contractually required cash flows at acquisition	99,611
Non-accretable difference (expected losses and foregone interest)	(52,995)
Cash flows expected to be collected at acquisition	46,616
Accretable yield	(1,063)
Basis in acquired loans at acquisition	45,553
Acquired Performing Loans [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Contractually required cash flows at acquisition	2,074,623
Non-accretable difference (expected losses and foregone interest)	(248,666)
Cash flows expected to be collected at acquisition	1,825,957
Accretable yield	(283,029)
Basis in acquired loans at acquisition	$ 1,542,928

Loans and Leases - Summary of N

Loans and Leases - Summary of Non-Performing Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled debt restructurings	$ 49,914	$ 45,500
Non-Performing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	63,036	49,897
Troubled debt restructurings	21,453	22,028
Total non-performing loans	84,489	71,925
Other real estate owned (OREO)	50,526	38,918
Total non-performing assets	$ 135,015	$ 110,843
Non-performing loans as a percent of total loans and leases	0.60%	0.59%
Non-performing loans + OREO as a percent of total loans and leases + OREO	0.95%	0.91%
Non-performing assets as a percent of total assets	0.66%	0.63%

Loans and Leases - Age Analysis

Loans and Leases - Age Analysis of Past Due Loans, by Class (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	$ 14,165,599	$ 12,190,440
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	5,253,660	4,109,056
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	3,046,267	2,601,722
Commercial Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	202,605	204,553
Total Commercial Loans and Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	8,502,532	6,915,331
Direct Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	1,790,802	1,706,636
Residential Mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	1,531,379	1,395,971
Indirect Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	1,025,727	996,729
Consumer Lines of Credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	1,261,493	1,137,255
Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	53,666	38,518
Originated Loans and Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	36,711	46,683
> 90 Days Past Due and Still Accruing	6,120	7,024
Non-Accrual	61,997	48,774
Total Past Due	104,828	102,481
Current	11,182,876	10,929,498
Total Loans	11,287,704	11,031,979
Originated Loans and Leases [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	9,342	11,006
> 90 Days Past Due and Still Accruing	1	1
Non-Accrual	24,083	23,503
Total Past Due	33,426	34,510
Current	3,571,875	3,496,636
Total Loans	3,605,301	3,531,146
Originated Loans and Leases [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	4,653	5,409
> 90 Days Past Due and Still Accruing	3	3
Non-Accrual	24,627	14,382
Total Past Due	29,283	19,794
Current	2,545,038	2,514,557
Total Loans	2,574,321	2,534,351
Originated Loans and Leases [Member] | Commercial Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	1,422	924
> 90 Days Past Due and Still Accruing	15
Non-Accrual	894	659
Total Past Due	2,331	1,583
Current	200,274	202,970
Total Loans	202,605	204,553
Originated Loans and Leases [Member] | Total Commercial Loans and Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	15,417	17,339
> 90 Days Past Due and Still Accruing	19	4
Non-Accrual	49,604	38,544
Total Past Due	65,040	55,887
Current	6,317,187	6,214,163
Total Loans	6,382,227	6,270,050
Originated Loans and Leases [Member] | Direct Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	6,845	9,254
> 90 Days Past Due and Still Accruing	3,463	3,813
Non-Accrual	5,646	4,806
Total Past Due	15,954	17,873
Current	1,670,083	1,642,844
Total Loans	1,686,037	1,660,717
Originated Loans and Leases [Member] | Residential Mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	7,398	8,135
> 90 Days Past Due and Still Accruing	1,545	1,470
Non-Accrual	3,446	2,882
Total Past Due	12,389	12,487
Current	1,093,291	1,032,202
Total Loans	1,105,680	1,044,689
Originated Loans and Leases [Member] | Indirect Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	5,479	9,472
> 90 Days Past Due and Still Accruing	369	379
Non-Accrual	1,347	1,361
Total Past Due	7,195	11,212
Current	1,018,218	984,963
Total Loans	1,025,413	996,175
Originated Loans and Leases [Member] | Consumer Lines of Credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	1,523	2,410
> 90 Days Past Due and Still Accruing	661	1,189
Non-Accrual	1,954	1,181
Total Past Due	4,138	4,780
Current	1,030,543	1,017,050
Total Loans	1,034,681	1,021,830
Originated Loans and Leases [Member] | Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	49	73
> 90 Days Past Due and Still Accruing	63	169
Total Past Due	112	242
Current	53,554	38,276
Total Loans	53,666	38,518
Acquired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	44,651	15,034
> 90 Days Past Due and Still Accruing	47,913	29,718
Non-Accrual	1,039	1,123
Total Past Due	93,603	45,875
Current	2,959,300	1,193,517
Discount	(175,008)	(80,931)
Total Loans	2,877,895	1,158,461
Acquired Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	27,329	6,399
> 90 Days Past Due and Still Accruing	23,563	12,752
Non-Accrual	740	931
Total Past Due	51,632	20,082
Current	1,695,949	593,128
Discount	(99,222)	(35,300)
Total Loans	1,648,359	577,910
Acquired Loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	1,879	1,065
> 90 Days Past Due and Still Accruing	6,596	616
Non-Accrual	152	103
Total Past Due	8,627	1,784
Current	499,764	72,037
Discount	(36,445)	(6,450)
Total Loans	471,946	67,371
Acquired Loans [Member] | Total Commercial Loans and Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	29,208	7,464
> 90 Days Past Due and Still Accruing	30,159	13,368
Non-Accrual	892	1,034
Total Past Due	60,259	21,866
Current	2,195,713	665,165
Discount	(135,667)	(41,750)
Total Loans	2,120,305	645,281
Acquired Loans [Member] | Direct Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	2,855	837
> 90 Days Past Due and Still Accruing	958	659
Total Past Due	3,813	1,496
Current	97,964	43,596
Discount	2,988	827
Total Loans	104,765	45,919
Acquired Loans [Member] | Residential Mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	11,010	5,871
> 90 Days Past Due and Still Accruing	15,498	15,136
Total Past Due	26,508	21,007
Current	436,528	366,742
Discount	(37,337)	(36,467)
Total Loans	425,699	351,282
Acquired Loans [Member] | Indirect Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due		32
> 90 Days Past Due and Still Accruing	6	9
Total Past Due	6	41
Current	413	571
Discount	(105)	(58)
Total Loans	314	554
Acquired Loans [Member] | Consumer Lines of Credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	1,578	830
> 90 Days Past Due and Still Accruing	1,292	546
Non-Accrual	147	89
Total Past Due	3,017	1,465
Current	228,682	117,443
Discount	(4,887)	(3,483)
Total Loans	$ 226,812	$ 115,425

Loans and Leases - Summary of57

Loans and Leases - Summary of Commercial Loans and Leases by Credit Quality (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Originated Loans and Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	$ 6,382,227	$ 6,270,050
Originated Loans and Leases [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	3,605,301	3,531,146
Originated Loans and Leases [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	2,574,321	2,534,351
Originated Loans and Leases [Member] | Commercial Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	202,605	204,553
Acquired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	2,120,305	645,281
Acquired Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	1,648,359	577,910
Acquired Loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	471,946	67,371
Pass [Member] | Originated Loans and Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	5,986,977	5,949,837
Pass [Member] | Originated Loans and Leases [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	3,445,547	3,416,527
Pass [Member] | Originated Loans and Leases [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	2,346,483	2,335,103
Pass [Member] | Originated Loans and Leases [Member] | Commercial Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	194,947	198,207
Pass [Member] | Acquired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	1,701,041	520,608
Pass [Member] | Acquired Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	1,331,863	464,162
Pass [Member] | Acquired Loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	369,178	56,446
Special Mention [Member] | Originated Loans and Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	214,955	164,873
Special Mention [Member] | Originated Loans and Leases [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	97,426	52,887
Special Mention [Member] | Originated Loans and Leases [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	114,408	109,539
Special Mention [Member] | Originated Loans and Leases [Member] | Commercial Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	3,121	2,447
Special Mention [Member] | Acquired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	179,923	50,801
Special Mention [Member] | Acquired Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	156,709	47,619
Special Mention [Member] | Acquired Loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	23,214	3,182
Substandard [Member] | Originated Loans and Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	174,283	152,690
Substandard [Member] | Originated Loans and Leases [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	61,928	61,411
Substandard [Member] | Originated Loans and Leases [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	107,818	87,380
Substandard [Member] | Originated Loans and Leases [Member] | Commercial Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	4,537	3,899
Substandard [Member] | Acquired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	230,826	73,872
Substandard [Member] | Acquired Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	152,929	66,129
Substandard [Member] | Acquired Loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	77,897	7,743
Doubtful [Member] | Originated Loans and Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	6,012	2,650
Doubtful [Member] | Originated Loans and Leases [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	400	321
Doubtful [Member] | Originated Loans and Leases [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	5,612	$ 2,329
Doubtful [Member] | Acquired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	8,515
Doubtful [Member] | Acquired Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	6,858
Doubtful [Member] | Acquired Loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	$ 1,657

Loans and Leases - Summary of58

Loans and Leases - Summary of Consumer Loans by Payment Status (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Credit Quality [Line Items]
Total Loans	$ 14,165,599	$ 12,190,440
Performing [Member]
Credit Quality [Line Items]
Performing Loans	4,873,598	4,731,813
Non Performing Consumer Originated [Member]
Credit Quality [Line Items]
Non-Performing Loans	31,879	30,116
Direct Installment [Member]
Credit Quality [Line Items]
Total Loans	1,790,802	1,706,636
Direct Installment [Member] | Performing [Member]
Credit Quality [Line Items]
Performing Loans	1,671,896	1,646,925
Direct Installment [Member] | Non Performing Consumer Originated [Member]
Credit Quality [Line Items]
Non-Performing Loans	14,141	13,792
Residential Mortgages [Member]
Credit Quality [Line Items]
Total Loans	1,531,379	1,395,971
Residential Mortgages [Member] | Performing [Member]
Credit Quality [Line Items]
Performing Loans	1,092,329	1,031,926
Residential Mortgages [Member] | Non Performing Consumer Originated [Member]
Credit Quality [Line Items]
Non-Performing Loans	13,351	12,763
Indirect Installment [Member]
Credit Quality [Line Items]
Total Loans	1,025,727	996,729
Indirect Installment [Member] | Performing [Member]
Credit Quality [Line Items]
Performing Loans	1,023,909	994,661
Indirect Installment [Member] | Non Performing Consumer Originated [Member]
Credit Quality [Line Items]
Non-Performing Loans	1,504	1,514
Consumer Lines of Credit [Member] | Performing [Member]
Credit Quality [Line Items]
Performing Loans	1,031,798	1,019,783
Consumer Lines of Credit [Member] | Non Performing Consumer Originated [Member]
Credit Quality [Line Items]
Non-Performing Loans	2,883	2,047
Other [Member]
Credit Quality [Line Items]
Total Loans	53,666	38,518
Other [Member] | Performing [Member]
Credit Quality [Line Items]
Performing Loans	53,666	38,518
Originated Consumer Loans [Member]
Credit Quality [Line Items]
Total Loans	4,905,477	4,761,929
Originated Consumer Loans [Member] | Direct Installment [Member]
Credit Quality [Line Items]
Total Loans	1,686,037	1,660,717
Originated Consumer Loans [Member] | Residential Mortgages [Member]
Credit Quality [Line Items]
Total Loans	1,105,680	1,044,689
Originated Consumer Loans [Member] | Indirect Installment [Member]
Credit Quality [Line Items]
Total Loans	1,025,413	996,175
Originated Consumer Loans [Member] | Consumer Lines of Credit [Member]
Credit Quality [Line Items]
Total Loans	1,034,681	1,021,830
Originated Consumer Loans [Member] | Other [Member]
Credit Quality [Line Items]
Total Loans	$ 53,666	$ 38,518

Loans and Leases - Summary of I

Loans and Leases - Summary of Impaired Loans and Lease, by Class (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	$ 96,412	$ 84,525
Recorded Investment With No Specific Reserve	68,850	64,374
Recorded Investment With Specific Reserve	13,999	6,315
Total Recorded Investment	82,849	70,689
Specific Reserve	6,012	2,650
Average Recorded Investment	75,992	68,950
Commercial Real Estate [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	33,434	33,780
Recorded Investment With No Specific Reserve	24,035	24,423
Recorded Investment With Specific Reserve	1,520	772
Total Recorded Investment	25,555	25,195
Specific Reserve	400	321
Average Recorded Investment	25,374	26,143
Commercial and Industrial [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	25,965	15,860
Recorded Investment With No Specific Reserve	12,042	9,176
Recorded Investment With Specific Reserve	12,479	5,543
Total Recorded Investment	24,521	14,719
Specific Reserve	5,612	2,329
Average Recorded Investment	19,620	12,298
Commercial Leases [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	894	659
Recorded Investment With No Specific Reserve	894	659
Total Recorded Investment	894	659
Average Recorded Investment		747
Total Commercial Loans and Leases [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	60,293	50,299
Recorded Investment With No Specific Reserve	36,971	34,258
Recorded Investment With Specific Reserve	13,999	6,315
Total Recorded Investment	50,970	40,573
Specific Reserve	6,012	2,650
Average Recorded Investment	44,994	39,188
Direct Installment [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	15,135	14,679
Recorded Investment With No Specific Reserve	14,141	13,792
Total Recorded Investment	14,141	13,792
Average Recorded Investment	13,966	13,267
Residential Mortgages [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	13,881	13,394
Recorded Investment With No Specific Reserve	13,351	12,763
Total Recorded Investment	13,351	12,763
Average Recorded Investment	13,058	12,896
Indirect Installment [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	3,667	3,745
Recorded Investment With No Specific Reserve	1,504	1,514
Total Recorded Investment	1,504	1,514
Average Recorded Investment	1,509	1,401
Consumer Lines of Credit [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	3,436	2,408
Recorded Investment With No Specific Reserve	2,883	2,047
Total Recorded Investment	2,883	2,047
Average Recorded Investment	$ 2,465	$ 2,198

Loans and Leases - Summary of P

Loans and Leases - Summary of Payment Status of Originated TDRs (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings ("TDRs")	$ 49,914	$ 45,500
Performing [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings ("TDRs")	16,508	15,165
Non-Performing [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings ("TDRs")	21,453	22,028
Non-Accrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings ("TDRs")	$ 11,953	$ 8,307

Loans and Leases - Summary of T

Loans and Leases - Summary of Troubled Debt Restructurings by Class of Loans (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2016USD ($)Contract	Mar. 31, 2015USD ($)Contract
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	192	168
Pre-Modification Outstanding Recorded Investment	$ 9,556	$ 2,705
Post-Modification Outstanding Recorded Investment	$ 7,201	$ 2,597
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	4	2
Pre-Modification Outstanding Recorded Investment	$ 778	$ 312
Post-Modification Outstanding Recorded Investment	$ 760	$ 196
Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	2
Pre-Modification Outstanding Recorded Investment	$ 5,565
Post-Modification Outstanding Recorded Investment	$ 3,279
Total Commercial Loans and Leases [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	6	2
Pre-Modification Outstanding Recorded Investment	$ 6,343	$ 312
Post-Modification Outstanding Recorded Investment	$ 4,039	$ 196
Direct Installment [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	145	131
Pre-Modification Outstanding Recorded Investment	$ 1,991	$ 1,526
Post-Modification Outstanding Recorded Investment	$ 1,961	$ 1,484
Residential Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	18	14
Pre-Modification Outstanding Recorded Investment	$ 968	$ 581
Post-Modification Outstanding Recorded Investment	$ 951	$ 631
Indirect Installment [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	3	5
Pre-Modification Outstanding Recorded Investment	$ 11	$ 16
Post-Modification Outstanding Recorded Investment	$ 12	$ 16
Consumer Lines of Credit [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	20	16
Pre-Modification Outstanding Recorded Investment	$ 243	$ 270
Post-Modification Outstanding Recorded Investment	$ 238	$ 270

Loans and Leases - Summary of62

Loans and Leases - Summary of Originated Troubled Debt Restructurings by Class of Loans and Leases, Payment Default (Detail) $ in Thousands		3 Months Ended
		Mar. 31, 2016USD ($)Contract	Mar. 31, 2015USD ($)Contract
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract		34	43
Recorded Investment | $	[1]	$ 240	$ 303
Direct Installment [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract		28	37
Recorded Investment | $	[1]	$ 175	$ 105
Residential Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract		1	2
Recorded Investment | $	[1]	$ 50	$ 102
Indirect Installment [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract		4	3
Recorded Investment | $	[1]	$ 5	$ 4
Consumer Lines of Credit [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract		1	1
Recorded Investment | $	[1]	$ 10	$ 92
[1]	The recorded investment is as of period end.

Allowance for Credit Losses - S

Allowance for Credit Losses - Summary of Changes in Allowance for Credit Losses by Loan and Lease Class (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Schedule Of Allowance For Loan Losses [Line Items]
Balance at Beginning of Period	$ 142,012	$ 125,926
Charge- Offs	(7,884)	(6,888)
Recoveries	1,904	1,325
Net Charge- Offs	(5,980)	(5,563)
Provision for credit losses	11,768	8,136
Balance at End of Period	147,800	128,499
Originated Loans and Leases [Member]
Schedule Of Allowance For Loan Losses [Line Items]
Balance at Beginning of Period	135,285	117,952
Charge- Offs	(7,503)	(6,747)
Recoveries	1,598	976
Net Charge- Offs	(5,905)	(5,771)
Provision for credit losses	12,840	9,066
Balance at End of Period	142,220	121,247
Acquired Loans [Member]
Schedule Of Allowance For Loan Losses [Line Items]
Balance at Beginning of Period	6,727	7,974
Charge- Offs	(381)	(141)
Recoveries	306	349
Net Charge- Offs	(75)	208
Provision for credit losses	(1,072)	(930)
Balance at End of Period	5,580	7,252
Commercial Real Estate [Member]
Schedule Of Allowance For Loan Losses [Line Items]
Balance at Beginning of Period	41,741	37,588
Charge- Offs	(1,369)	(1,001)
Recoveries	597	209
Net Charge- Offs	(772)	(792)
Provision for credit losses	2,929	1,996
Balance at End of Period	43,898	38,792
Commercial and Industrial [Member]
Schedule Of Allowance For Loan Losses [Line Items]
Balance at Beginning of Period	41,023	32,645
Charge- Offs	(298)	(684)
Recoveries	190	120
Net Charge- Offs	(108)	(564)
Provision for credit losses	6,948	722
Balance at End of Period	47,863	32,803
Commercial Leases [Member]
Schedule Of Allowance For Loan Losses [Line Items]
Balance at Beginning of Period	2,541	2,398
Charge- Offs	(114)	(93)
Recoveries	14	10
Net Charge- Offs	(100)	(83)
Provision for credit losses	377	261
Balance at End of Period	2,818	2,576
Total Commercial Loans and Leases [Member]
Schedule Of Allowance For Loan Losses [Line Items]
Balance at Beginning of Period	85,305	72,631
Charge- Offs	(1,781)	(1,778)
Recoveries	801	339
Net Charge- Offs	(980)	(1,439)
Provision for credit losses	10,254	2,979
Balance at End of Period	94,579	74,171
Direct Installment [Member]
Schedule Of Allowance For Loan Losses [Line Items]
Balance at Beginning of Period	21,587	20,538
Charge- Offs	(2,667)	(2,433)
Recoveries	454	269
Net Charge- Offs	(2,213)	(2,164)
Provision for credit losses	1,351	2,830
Balance at End of Period	20,725	21,204
Residential Mortgages [Member]
Schedule Of Allowance For Loan Losses [Line Items]
Balance at Beginning of Period	7,909	8,024
Charge- Offs	(85)	(511)
Recoveries	19	15
Net Charge- Offs	(66)	(496)
Provision for credit losses	(33)	943
Balance at End of Period	7,810	8,471
Indirect Installment [Member]
Schedule Of Allowance For Loan Losses [Line Items]
Balance at Beginning of Period	9,889	7,504
Charge- Offs	(1,942)	(1,280)
Recoveries	262	302
Net Charge- Offs	(1,680)	(978)
Provision for credit losses	856	1,131
Balance at End of Period	9,065	7,657
Consumer Lines of Credit [Member]
Schedule Of Allowance For Loan Losses [Line Items]
Balance at Beginning of Period	9,582	8,496
Charge- Offs	(474)	(410)
Recoveries	56	40
Net Charge- Offs	(418)	(370)
Provision for credit losses	(197)	764
Balance at End of Period	8,967	8,890
Other [Member]
Schedule Of Allowance For Loan Losses [Line Items]
Balance at Beginning of Period	1,013	759
Charge- Offs	(554)	(335)
Recoveries	6	11
Net Charge- Offs	(548)	(324)
Provision for credit losses	609	419
Balance at End of Period	1,074	854
Purchased Credit-Impaired Loans [Member]
Schedule Of Allowance For Loan Losses [Line Items]
Balance at Beginning of Period	834	660
Charge- Offs	(160)	(64)
Recoveries		19
Net Charge- Offs	(160)	(45)
Provision for credit losses	30	6
Balance at End of Period	704	621
Other Acquired Loans [Member]
Schedule Of Allowance For Loan Losses [Line Items]
Balance at Beginning of Period	5,893	7,314
Charge- Offs	(221)	(77)
Recoveries	306	330
Net Charge- Offs	85	253
Provision for credit losses	(1,102)	(936)
Balance at End of Period	$ 4,876	$ 6,631

Allowance for Credit Losses -64

Allowance for Credit Losses - Summary of Individual and Collective Allowance for Credit Losses and Loan and Lease Balances by Class (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Valuation Allowance [Line Items]
Originated Allowance, Individually Evaluated for Impairment	$ 6,012	$ 2,650
Originated Allowance, Collectively Evaluated for Impairment	136,208	132,635
Loans and Leases	14,165,599	12,190,440
Originated Loans and Leases Outstanding, Individually Evaluated for Impairment	33,939	23,706
Originated Loans and Leases Outstanding, Collectively Evaluated for Impairment	11,253,765	11,008,273
Commercial Real Estate [Member]
Valuation Allowance [Line Items]
Originated Allowance, Individually Evaluated for Impairment	400	321
Originated Allowance, Collectively Evaluated for Impairment	43,498	41,420
Loans and Leases	5,253,660	4,109,056
Originated Loans and Leases Outstanding, Individually Evaluated for Impairment	14,260	12,904
Originated Loans and Leases Outstanding, Collectively Evaluated for Impairment	3,591,041	3,518,242
Commercial and Industrial [Member]
Valuation Allowance [Line Items]
Originated Allowance, Individually Evaluated for Impairment	5,612	2,329
Originated Allowance, Collectively Evaluated for Impairment	42,251	38,694
Loans and Leases	3,046,267	2,601,722
Originated Loans and Leases Outstanding, Individually Evaluated for Impairment	19,679	10,802
Originated Loans and Leases Outstanding, Collectively Evaluated for Impairment	2,554,642	2,523,549
Commercial Leases [Member]
Valuation Allowance [Line Items]
Originated Allowance, Collectively Evaluated for Impairment	2,818	2,541
Loans and Leases	202,605	204,553
Originated Loans and Leases Outstanding, Collectively Evaluated for Impairment	202,605	204,553
Total Commercial Loans and Leases [Member]
Valuation Allowance [Line Items]
Originated Allowance, Individually Evaluated for Impairment	6,012	2,650
Originated Allowance, Collectively Evaluated for Impairment	88,567	82,655
Loans and Leases	8,502,532	6,915,331
Originated Loans and Leases Outstanding, Individually Evaluated for Impairment	33,939	23,706
Originated Loans and Leases Outstanding, Collectively Evaluated for Impairment	6,348,288	6,246,344
Direct Installment [Member]
Valuation Allowance [Line Items]
Originated Allowance, Collectively Evaluated for Impairment	20,725	21,587
Loans and Leases	1,790,802	1,706,636
Originated Loans and Leases Outstanding, Collectively Evaluated for Impairment	1,686,037	1,660,717
Residential Mortgages [Member]
Valuation Allowance [Line Items]
Originated Allowance, Collectively Evaluated for Impairment	7,810	7,909
Loans and Leases	1,531,379	1,395,971
Originated Loans and Leases Outstanding, Collectively Evaluated for Impairment	1,105,680	1,044,689
Indirect Installment [Member]
Valuation Allowance [Line Items]
Originated Allowance, Collectively Evaluated for Impairment	9,065	9,889
Loans and Leases	1,025,727	996,729
Originated Loans and Leases Outstanding, Collectively Evaluated for Impairment	1,025,413	996,175
Consumer Lines of Credit [Member]
Valuation Allowance [Line Items]
Originated Allowance, Collectively Evaluated for Impairment	8,967	9,582
Loans and Leases	1,261,493	1,137,255
Originated Loans and Leases Outstanding, Collectively Evaluated for Impairment	1,034,681	1,021,830
Other [Member]
Valuation Allowance [Line Items]
Originated Allowance, Collectively Evaluated for Impairment	1,074	1,013
Loans and Leases	53,666	38,518
Originated Loans and Leases Outstanding, Collectively Evaluated for Impairment	53,666	38,518
Loans and Leases [Member]
Valuation Allowance [Line Items]
Loans and Leases	11,287,704	11,031,979
Loans and Leases [Member] | Commercial Real Estate [Member]
Valuation Allowance [Line Items]
Loans and Leases	3,605,301	3,531,146
Loans and Leases [Member] | Commercial and Industrial [Member]
Valuation Allowance [Line Items]
Loans and Leases	2,574,321	2,534,351
Loans and Leases [Member] | Commercial Leases [Member]
Valuation Allowance [Line Items]
Loans and Leases	202,605	204,553
Loans and Leases [Member] | Total Commercial Loans and Leases [Member]
Valuation Allowance [Line Items]
Loans and Leases	6,382,227	6,270,050
Loans and Leases [Member] | Direct Installment [Member]
Valuation Allowance [Line Items]
Loans and Leases	1,686,037	1,660,717
Loans and Leases [Member] | Residential Mortgages [Member]
Valuation Allowance [Line Items]
Loans and Leases	1,105,680	1,044,689
Loans and Leases [Member] | Indirect Installment [Member]
Valuation Allowance [Line Items]
Loans and Leases	1,025,413	996,175
Loans and Leases [Member] | Consumer Lines of Credit [Member]
Valuation Allowance [Line Items]
Loans and Leases	1,034,681	1,021,830
Loans and Leases [Member] | Other [Member]
Valuation Allowance [Line Items]
Loans and Leases	$ 53,666	$ 38,518

Borrowings - Summary of Short-T

Borrowings - Summary of Short-Term Borrowings (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Debt Disclosure [Abstract]
Securities sold under repurchase agreements	$ 297,562	$ 266,732
Federal Home Loan Bank advances	490,000	1,090,000
Federal funds purchased	652,000	568,000
Subordinated notes	124,326	124,164
Short-term borrowings	$ 1,563,888	$ 2,048,896

Borrowings - Summary of Long-Te

Borrowings - Summary of Long-Term Borrowings (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Debt Disclosure [Abstract]
Federal Home Loan Bank advances	$ 425,147	$ 400,017
Subordinated notes	85,206	84,668
Junior subordinated debt	48,572	58,298
Other subordinated debt	98,520	98,497
Long-term debt	$ 657,445	$ 641,480

Borrowings - Additional Informa

Borrowings - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)	Mar. 31, 2016USD ($)Trust	Dec. 31, 2015
Debt Instrument [Line Items]
Credit available with FHLB		$ 5,543,082
Credit with FHLB used		$ 915,147
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%
Scenario, Forecast [Member] | Omega Financial Capital Trust I [Member]
Debt Instrument [Line Items]
Redemption of Corporation Issued TPS	$ 10,000

Borrowings - Junior Subordinate

Borrowings - Junior Subordinated Debt Trusts (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Subordinated Borrowing [Line Items]
Junior subordinated debt	$ 48,572	$ 58,298
Trust Preferred Securities Subject to Mandatory Redemption [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	47,500
Common Stock Subject to Mandatory Redemption [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	1,779
F.N.B. Statutory Trust II [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	$ 22,165
Stated Maturity Date	Jun. 15, 2036
Interest Rate	2.28%
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	$ 26,407
Stated Maturity Date	Oct. 18, 2034
Interest Rate	2.81%
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	$ 26,000
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 Activi69

Derivative and Hedging Activities - Schedule of Notional Amounts and Gross Fair Values of Derivative Assets and Derivative Liabilities (Detail) - USD ($)	Mar. 31, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Notional amount	$ 3,134,482,000	$ 2,893,041,000
Fair value, asset	88,006,000	53,202,000
Liability	82,219,000	51,605,000
Interest Rate Contracts [Member]
Derivatives, Fair Value [Line Items]
Notional amount	250,000,000	250,000,000
Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Notional amount	1,373,959,000	1,262,964,000
Credit Risk Contracts [Member]
Derivatives, Fair Value [Line Items]
Fair value, asset	22,000	7,000
Subject to Master Netting Arrangement [Member]
Derivatives, Fair Value [Line Items]
Notional amount	1,625,139,000	1,514,144,000
Fair value, asset	7,893,000	3,197,000
Liability	81,966,000	51,453,000
Subject to Master Netting Arrangement [Member] | Interest Rate Contracts [Member]
Derivatives, Fair Value [Line Items]
Notional amount	250,000,000	250,000,000
Fair value, asset	7,859,000	3,178,000
Liability	1,341,000	962,000
Subject to Master Netting Arrangement [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Notional amount	1,373,959,000	1,262,964,000
Fair value, asset		1,000
Liability	80,625,000	50,491,000
Subject to Master Netting Arrangement [Member] | Equity Contracts [Member]
Derivatives, Fair Value [Line Items]
Notional amount	1,180,000	1,180,000
Fair value, asset	34,000	18,000
Not Subject to Master Netting Arrangement [Member]
Derivatives, Fair Value [Line Items]
Notional amount	1,509,343,000	1,378,897,000
Fair value, asset	80,113,000	50,005,000
Liability	253,000	152,000
Not Subject to Master Netting Arrangement [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Notional amount	1,373,959,000	1,262,964,000
Fair value, asset	80,091,000	49,998,000
Liability		1,000
Not Subject to Master Netting Arrangement [Member] | Equity Contracts [Member]
Derivatives, Fair Value [Line Items]
Notional amount	1,180,000	1,180,000
Liability	34,000	18,000
Not Subject to Master Netting Arrangement [Member] | Credit Risk Contracts [Member]
Derivatives, Fair Value [Line Items]
Notional amount	134,204,000	114,753,000
Fair value, asset	22,000	7,000
Liability	$ 219,000	$ 133,000

Derivative and Hedging Activi70

Derivative and Hedging Activities - Additional Information (Detail) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Derivative [Line Items]
Notional amount	$ 3,134,482,000		$ 2,893,041,000
Derivative assets	88,006,000		53,202,000
Derivative liabilities	82,219,000		51,605,000
Amounts reclassified from AOCI	(395,000)
Additional amount in excess of posted collateral required in case of breached agreements	1,894,000		1,333,000
Interest Rate Contracts [Member]
Derivative [Line Items]
Notional amount	$ 250,000,000		250,000,000
Period to reclassification of cash flow hedge gain loss	12 months
Maximum length of time hedged in interest rate cash flow hedge	7 years
Derivative gains to be reclassified within twelve months	$ 1,979,000
Derivative gains to be reclassified within twelve months, net of tax	1,286,000
Derivative gain or loses excluded from assessment of hedge effectiveness	0
Hedge ineffectiveness	0	$ 0
Gains or losses from cash flow hedge derivatives reclassified to earnings	0	$ 0
Interest Rate Contracts [Member] | Interest Income - Loans and Leases [Member]
Derivative [Line Items]
Derivative financial instrument, net	687,000		809,000
Interest Rate Contracts [Member] | Interest Income - Loans and Leases [Member] | Amount Reclassified from Other Comprehensive Income [Member]
Derivative [Line Items]
Derivative financial instrument, net	687,000
Amounts reclassified from AOCI	446,000
Interest Rate Contracts [Member] | Interest Expense - Short-term Borrowings [Member]
Derivative [Line Items]
Derivative financial instrument, net	150,000
Interest Rate Contracts [Member] | Interest Expense - Short-term Borrowings [Member] | Amount Reclassified from Other Comprehensive Income [Member]
Derivative [Line Items]
Derivative financial instrument, net	150,000
Amounts reclassified from AOCI	97,000
Interest Rate Swap [Member]
Derivative [Line Items]
Notional amount	1,373,959,000		1,262,964,000
Credit Risk Contract Sold [Member]
Derivative [Line Items]
Notional amount	$ 83,010,000
Risk participation agreements, minimum term	1 year
Risk participation agreements, maximum term	14 years
Maximum exposure under credit risk agreement assuming customer default	$ 219,000		133,000
Not for Trading Assets [Member] | Interest Rate Contracts [Member]
Derivative [Line Items]
Derivative assets	7,859,000		3,178,000
Trading Assets [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative assets	80,091,000		49,999,000
Not for Trading Liabilities [Member] | Interest Rate Contracts [Member]
Derivative [Line Items]
Derivative liabilities	1,341,000		962,000
Trading Liabilities [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative liabilities	$ 80,625,000		$ 50,492,000

Derivative and Hedging Activi71

Derivative and Hedging Activities - Offsetting of Derivative Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Gross Amount	$ 88,006	$ 53,202
Gross Amounts Offset in the Balance Sheet, Derivative Assets	0	0
Net Amount Presented in the Balance Sheet	88,006	53,202
Credit Risk Contracts [Member]
Derivatives, Fair Value [Line Items]
Gross Amount	22	7
Gross Amounts Offset in the Balance Sheet, Derivative Assets	0	0
Net Amount Presented in the Balance Sheet	22	7
Subject to Master Netting Arrangement [Member]
Derivatives, Fair Value [Line Items]
Net Amount Presented in the Balance Sheet	7,893	3,197
Subject to Master Netting Arrangement [Member] | Interest Rate Contracts [Member]
Derivatives, Fair Value [Line Items]
Gross Amount	7,859	3,178
Gross Amounts Offset in the Balance Sheet, Derivative Assets	0	0
Net Amount Presented in the Balance Sheet	7,859	3,178
Subject to Master Netting Arrangement [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Gross Amount		1
Gross Amounts Offset in the Balance Sheet, Derivative Assets	0	0
Net Amount Presented in the Balance Sheet		1
Subject to Master Netting Arrangement [Member] | Equity Contracts [Member]
Derivatives, Fair Value [Line Items]
Gross Amount	34	18
Gross Amounts Offset in the Balance Sheet, Derivative Assets	0	0
Net Amount Presented in the Balance Sheet	34	18
Not Subject to Master Netting Arrangement [Member]
Derivatives, Fair Value [Line Items]
Net Amount Presented in the Balance Sheet	80,113	50,005
Not Subject to Master Netting Arrangement [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Gross Amount	80,091	49,998
Gross Amounts Offset in the Balance Sheet, Derivative Assets	0	0
Net Amount Presented in the Balance Sheet	80,091	49,998
Not Subject to Master Netting Arrangement [Member] | Credit Risk Contracts [Member]
Derivatives, Fair Value [Line Items]
Net Amount Presented in the Balance Sheet	$ 22	$ 7

Derivative and Hedging Activi72

Derivative and Hedging Activities - Offsetting of Derivative Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Gross Amount	$ 82,219	$ 51,605
Gross Amounts Offset in the Balance Sheet, Derivative Liabilities	0	0
Net Amount Presented in the Balance Sheet	82,219	51,605
Subject to Master Netting Arrangement [Member]
Derivatives, Fair Value [Line Items]
Net Amount Presented in the Balance Sheet	81,966	51,453
Subject to Master Netting Arrangement [Member] | Interest Rate Contracts [Member]
Derivatives, Fair Value [Line Items]
Gross Amount	1,341	962
Gross Amounts Offset in the Balance Sheet, Derivative Liabilities	0	0
Net Amount Presented in the Balance Sheet	1,341	962
Subject to Master Netting Arrangement [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Gross Amount	80,625	50,491
Gross Amounts Offset in the Balance Sheet, Derivative Liabilities	0	0
Net Amount Presented in the Balance Sheet	80,625	50,491
Not Subject to Master Netting Arrangement [Member]
Derivatives, Fair Value [Line Items]
Net Amount Presented in the Balance Sheet	253	152
Not Subject to Master Netting Arrangement [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Gross Amount		1
Gross Amounts Offset in the Balance Sheet, Derivative Liabilities	0	0
Net Amount Presented in the Balance Sheet		1
Not Subject to Master Netting Arrangement [Member] | Credit Risk Contracts [Member]
Derivatives, Fair Value [Line Items]
Gross Amount	219	133
Gross Amounts Offset in the Balance Sheet, Derivative Liabilities	0	0
Net Amount Presented in the Balance Sheet	219	133
Not Subject to Master Netting Arrangement [Member] | Equity Contracts [Member]
Derivatives, Fair Value [Line Items]
Gross Amount	34	18
Gross Amounts Offset in the Balance Sheet, Derivative Liabilities	0	0
Net Amount Presented in the Balance Sheet	$ 34	$ 18

Derivative and Hedging Activi73

Derivative and Hedging Activities - Derivative Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Derivative [Line Items]
Net Amount Presented in the Balance Sheet	$ 88,006	$ 53,202
Subject to Master Netting Arrangement [Member]
Derivative [Line Items]
Net Amount Presented in the Balance Sheet	7,893	3,197
Gross Amounts Not Offset in the Balance Sheet Financial Instruments, Derivative Assets	5,086	1,535
Gross Amounts Not Offset in the Balance Sheet Cash Collateral Received, Derivative Assets	2,807	1,662
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	7,859	3,178
Gross Amounts Not Offset in the Balance Sheet Financial Instruments, Derivative Assets	5,052	1,516
Gross Amounts Not Offset in the Balance Sheet Cash Collateral Received, Derivative Assets	2,807	1,662
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
Gross Amounts Not Offset in the Balance Sheet Financial Instruments, Derivative Assets		1
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	34	18
Gross Amounts Not Offset in the Balance Sheet Financial Instruments, Derivative Assets	34	18
Net Amount, Derivative Assets	$ 0	$ 0

Derivative and Hedging Activi74

Derivative and Hedging Activities - Derivative Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Derivative [Line Items]
Net Amount Presented in the Balance Sheet	$ 82,219	$ 51,605
Subject to Master Netting Arrangement [Member]
Derivative [Line Items]
Net Amount Presented in the Balance Sheet	81,966	51,453
Gross Amount Not Offset in the Balance Sheet Financial Instruments, Derivative Liabilities	31,472	25,371
Gross Amount Not Offset in the Balance Sheet Cash Collateral Pledged, Derivative Liabilities	48,828	24,802
Net Amount, Derivative Liabilities	1,666	1,280
Subject to Master Netting Arrangement [Member] | Interest Rate Contracts [Member]
Derivative [Line Items]
Net Amount Presented in the Balance Sheet	1,341	962
Gross Amount Not Offset in the Balance Sheet Financial Instruments, Derivative Liabilities		792
Gross Amount Not Offset in the Balance Sheet Cash Collateral Pledged, Derivative Liabilities	1,341	170
Subject to Master Netting Arrangement [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Net Amount Presented in the Balance Sheet	80,625	50,491
Gross Amount Not Offset in the Balance Sheet Financial Instruments, Derivative Liabilities	31,472	24,579
Gross Amount Not Offset in the Balance Sheet Cash Collateral Pledged, Derivative Liabilities	47,487	24,632
Net Amount, Derivative Liabilities	$ 1,666	$ 1,280

Derivative and Hedging Activi75

Derivative and Hedging Activities - Effect of Corporation's Derivative Financial Instruments on Income Statement (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Interest Rate Contracts [Member] | Interest Income - Loans and Leases [Member]
Derivative [Line Items]
Derivative financial instrument, net	$ 687	$ 809
Interest Rate Contracts [Member] | Interest Expense - Short-term Borrowings [Member]
Derivative [Line Items]
Derivative financial instrument, net	150
Interest Rate Swap [Member] | Other Income [Member]
Derivative [Line Items]
Derivative financial instrument, net	(41)	$ (107)
Credit Risk Contracts [Member] | Other Income [Member]
Derivative [Line Items]
Derivative financial instrument, net	$ (71)

Commitments, Credit Risk and 76

Commitments, Credit Risk and Contingencies - Summary of Off-Balance Sheet Credit Risk Information (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Commitments to Extend Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Extended credit and standby letters of credit	$ 4,463,138	$ 3,781,719
Standby Letters of Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Extended credit and standby letters of credit	$ 118,167	$ 92,979

Commitments, Credit Risk and 77

Commitments, Credit Risk and Contingencies - Additional Information (Detail)	Mar. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Percentage of Commitments to extend credit dependent upon the financial condition of the customers	75.40%

Stock Incentive Plans - Additio

Stock Incentive Plans - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Apr. 06, 2013	Jun. 16, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock awards issued	0	0
Common stock shares available under incentive compensation plans	3,310,508
Unrecognized compensation expense	$ 8,097
Stock options exercised	24,806	60,094
Intrinsic value of outstanding and exercisable stock options	$ 10,045
Common shares available for purchase under warrants				651,042
Annapolis Bancorp, Inc. [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrant issued, exercise price	$ 3.21
Warrant issued	342,564
Warrants converted to purchase common stock	380,390
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense related to restricted stock awards	$ 1,136	$ 340
Tax benefit related to restricted stock awards	398	119
Total fair value of awards vested	4,424	$ 5,740
Unrecognized compensation expense	8,097
Amount subject to accelerated vesting under Incentive Compensation Plan	$ 40
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options exercised	24,806	60,094
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares available for purchase under warrants	1,302,083
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	$ 3,178
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	$ 4,919
Performance-Based Awards [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock percentage of number of units issued	175.00%
Performance-Based Awards [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock percentage of number of units issued	0.00%
Warrant Expires in 2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrant issued, exercise price	$ 11.52
Warrant Expires in 2019 [Member] | Annapolis Bancorp, Inc. [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrant issued, exercise price			$ 3.57
Market Based Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock percentage of number of units issued	100.00%

Stock Incentive Plans - Summary

Stock Incentive Plans - Summary of Information Concerning Restricted Stock Awards (Detail) - $ / shares	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Shares, Unvested awards outstanding at beginning of period	1,548,444	1,354,093
Shares, Net adjustment due to performance		(46,956)
Shares, Vested	(363,799)	(458,450)
Shares, Forfeited	(6,368)	(2,357)
Shares, Dividend reinvestment	10,870	7,656
Shares, Unvested shares outstanding at end of year	1,189,147	853,986
Weighted Average Grant Price per Share, Unvested awards outstanding at beginning of period	$ 12.85	$ 11.86
Weighted Average Grant Price per Share, Net adjustment due to performance		10.25
Weighted Average Grant Price per Share, Vested	12.07	10.60
Weighted Average Grant Price per Share, Forfeited	12.79	17.93
Weighted Average Grant Price per Share, Dividend reinvestment	11.50	14.24
Weighted Average Grant Price per Share, Unvested Shares outstanding at end of year	$ 13.08	$ 12.63

Stock Incentive Plans - Compone

Stock Incentive Plans - Components of Restricted Stock Awards (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested awards	1,189,147	1,548,444	853,986	1,354,093
Unrecognized compensation expense	$ 8,097
Intrinsic value	$ 15,471
Weighted average remaining life (in years)	2 years 29 days
Service-Based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested awards	514,702
Unrecognized compensation expense	$ 3,178
Intrinsic value	$ 6,696
Weighted average remaining life (in years)	1 year 8 months 9 days
Performance-Based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested awards	674,445
Unrecognized compensation expense	$ 4,919
Intrinsic value	$ 8,775
Weighted average remaining life (in years)	2 years 4 months 13 days

Stock Incentive Plans - Summa81

Stock Incentive Plans - Summary of Information Concerning Stock Option Awards (Detail) - $ / shares	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Shares, Options outstanding at beginning of period	435,340	568,834
Shares, Assumed from acquisitions	1,707,036
Shares, Exercised	(24,806)	(60,094)
Shares, Forfeited	(92,650)	(2,182)
Shares, Options outstanding and exercisable at end of period	2,024,920	506,558
Weighted Average Price per Share, Options outstanding at beginning of period	$ 8.86	$ 8.86
Weighted Average Price per Share, Assumed from acquisition	7.83
Weighted Average Price per Share, Exercised	6.38	5.04
Weighted Average Price per Share, Forfeited	6.69	4.34
Weighted Average Price per Share, Options outstanding and exercisable at end of period	$ 8.12	$ 9.33

Retirement Plans - Additional I

Retirement Plans - Additional Information (Detail) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016USD ($)RetirementPlans	Mar. 31, 2015USD ($)	Dec. 31, 2008
Retirement Plans Disclosure [Abstract]
Number of supplemental non-qualified retirement plans sponsored by the Corporation | RetirementPlans	2
Consecutive calendar years used to calculate BRP benefits			5 years
Term of employment for consideration of BRP			10 years
Percent of employer match	100.00%
Employee contribution percentage	6.00%
Additional discretionary contribution, performance goals, percentage	3.00%
Contribution expense of the Corporation | $	$ 2,462	$ 2,167

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
	Mar. 31, 2016	Mar. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ (4)	$ 17
Interest cost	1,544	1,477
Expected return on plan assets	(2,353)	(2,491)
Amortization:
Unrecognized prior service cost	2	2
Unrecognized loss	608	536
Net periodic pension credit	$ (203)	$ (459)

Comprehensive Income - Componen

Comprehensive Income - Components of Comprehensive Income, Net of Related Tax (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Components Of Comprehensive Income [Abstract]
Net income	$ 26,132	$ 40,343
Other comprehensive income:
Securities available for sale, Unrealized gains arising during the period, net of tax expense of $7,719 and $4,523	14,335	8,400
Securities available for sale, Reclassification adjustment for (gains) losses included in net income, net of tax expense of $25 and $(3)	(46)	6
Unrealized gains on derivative instruments arising during the period, net of tax expense of $1,693 and $1,504	3,145	2,793
Reclassification adjustment on derivative instruments for gains included in net income, net of tax expense of $188 and $283	(349)	(526)
Unrealized gains on pension and postretirement benefit obligations arising during the period, net of tax expense of $214 and $189	397	350
Other comprehensive income	17,482	11,023
Comprehensive income	$ 43,614	$ 51,366

Comprehensive Income - Compon85

Comprehensive Income - Components of Comprehensive Income, Net of Related Tax (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Components Of Comprehensive Income [Abstract]
Securities available for sale, Unrealized gains arising during the period, net of tax expense	$ 7,719	$ 4,523
Securities available for sale, Reclassification adjustment for gains included in net income, tax expense	25	(3)
Unrealized gains on derivative instruments arising during the period, net of tax expense	1,693	1,504
Reclassification adjustment on derivative instruments for gains included in net income, tax expense	188	283
Unrealized gains on pension and postretirement benefit obligations arising during the period, tax expense	$ 214	$ 189

Comprehensive Income - Changes

Comprehensive Income - Changes in AOCI, Net of Tax, by Component (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), balance at beginning of period	$ (51,133)
Other comprehensive income before reclassifications	17,877
Amounts reclassified from AOCI	(395)
Net current period other comprehensive income	17,482	$ 11,023
Accumulated other comprehensive income (loss), balance at end of period	(33,651)
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	(3,873)
Other comprehensive income before reclassifications	14,335
Amounts reclassified from AOCI	(46)
Net current period other comprehensive income	14,289
Accumulated other comprehensive income (loss), balance at end of period	10,416
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	1,440
Other comprehensive income before reclassifications	3,145
Amounts reclassified from AOCI	(349)
Net current period other comprehensive income	2,796
Accumulated other comprehensive income (loss), balance at end of period	4,236
Unrecognized Pension and Postretirement Obligations [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), balance at beginning of period	(48,700)
Other comprehensive income before reclassifications	397
Net current period other comprehensive income	397
Accumulated other comprehensive income (loss), balance at end of period	$ (48,303)

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
	Mar. 31, 2016	Mar. 31, 2015
Earnings Per Share [Abstract]
Net income	$ 26,132	$ 40,343
Less: Preferred stock dividends	2,010	2,010
Net income available to common stockholders	$ 24,122	$ 38,333
Basic weighted average common shares outstanding	193,585,702	174,152,283
Net effect of dilutive stock options, warrants, restricted stock and convertible debt	1,292,220	1,673,693
Diluted weighted average common shares outstanding	194,877,922	175,825,976
Basic	$ 0.12	$ 0.22
Diluted	$ 0.12	$ 0.22

Earnings Per Common Share - Add

Earnings Per Common Share - Additional Information (Detail) - shares	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Earnings Per Share [Abstract]
Common stock excluded from computation of diluted earnings per share	15,501	24,272

Cash Flow Information - Summary

Cash Flow Information - Summary of Supplemental Cash Flow Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Cash Flows [Abstract]
Interest paid on deposits and other borrowings	$ 13,794	$ 11,626
Income taxes paid	0	0
Transfers of loans to other real estate owned	8,049	1,965
Financing of other real estate owned sold	$ 62	$ 166

Business Segments - Additional

Business Segments - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2016Segment
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
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Segment Reporting Information [Line Items]
Interest income	$ 155,754	$ 133,369
Interest expense	15,400	11,448
Net interest income	140,354	121,921
Provision for credit losses	11,768	8,136
Non-interest income	46,044	38,182
Non-interest expense	133,999	92,540
Intangible amortization	2,649	2,115
Income tax expense (benefit)	11,850	16,969
Net income (loss)	26,132	40,343
Total assets	20,324,524	16,278,848	$ 17,557,662
Total intangibles	1,087,050	875,246
Operating Segments [Member] | Community Banking [Member]
Segment Reporting Information [Line Items]
Interest income	143,978	122,118
Interest expense	12,594	9,941
Net interest income	131,384	112,177
Provision for credit losses	9,917	6,327
Non-interest income	31,233	27,301
Non-interest expense	118,048	77,079
Intangible amortization	2,441	1,947
Income tax expense (benefit)	10,117	15,931
Net income (loss)	22,094	38,194
Total assets	20,151,815	16,100,851
Total intangibles	1,062,079	852,764
Operating Segments [Member] | Wealth Management [Member]
Segment Reporting Information [Line Items]
Non-interest income	8,816	8,387
Non-interest expense	7,089	6,493
Intangible amortization	65	68
Income tax expense (benefit)	605	658
Net income (loss)	1,057	1,168
Total assets	20,540	21,125
Total intangibles	10,383	10,652
Operating Segments [Member] | Insurance [Member]
Segment Reporting Information [Line Items]
Interest income	22	23
Net interest income	22	23
Non-interest income	4,194	3,593
Non-interest expense	3,301	4,170
Intangible amortization	143	100
Income tax expense (benefit)	275	(226)
Net income (loss)	497	(428)
Total assets	21,680	18,464
Total intangibles	12,779	10,021
Operating Segments [Member] | Consumer Finance [Member]
Segment Reporting Information [Line Items]
Interest income	9,785	9,593
Interest expense	941	860
Net interest income	8,844	8,733
Provision for credit losses	1,526	1,574
Non-interest income	716	676
Non-interest expense	5,204	4,808
Income tax expense (benefit)	1,112	1,149
Net income (loss)	1,718	1,878
Total assets	188,547	182,662
Total intangibles	1,809	1,809
Parent and Other [Member]
Segment Reporting Information [Line Items]
Interest income	1,969	1,635
Interest expense	1,865	647
Net interest income	104	988
Provision for credit losses	325	235
Non-interest income	1,085	(1,775)
Non-interest expense	357	(10)
Income tax expense (benefit)	(259)	(543)
Net income (loss)	766	(469)
Total assets	$ (58,058)	$ (44,254)

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Detail) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Fair Value Measurements Disclosure [Line Items]
Percentage of securities using market-based information	99.90%
Percentage of securities using model-based techniques	0.10%
Minimum reserves for commercial loan	$ 500,000
Impaired loans, carrying amount	82,849,000		$ 70,689,000
Allocated allowance for loan losses	6,012,000
Fair value of allocated allowance	8,214,000
Estimated costs to sell	162,000
Provision for fair value measurements included in allowance for loan losses	3,362,000
Carrying amount of OREO	2,616,000
Written down of OREO	1,803,000
Fair value of OREO	2,016,000
Estimated cost to sell OREO	213,000
Loss from OREO included in earnings	$ 813,000
Short-term borrowings approximate fair value for amounts that mature, days, less than	90 days
Fair Value, Measurements, Nonrecurring [Member]
Fair Value Measurements Disclosure [Line Items]
Impaired loans, carrying amount	$ 14,064,000
Allocated allowance for loan losses	8,214,000		3,828,000
Fair value of OREO	2,016,000		7,831,000
Equity Securities [Member]
Fair Value Measurements Disclosure [Line Items]
Transfer of equity security to non-marketable equity securities, included in other assets			$ 56,000
Assets Still Held [Member]
Fair Value Measurements Disclosure [Line Items]
Change in unrealized gains or losses included in earnings relating to assets still held	$ 0	$ 0

Fair Value Measurements - Balan

Fair Value Measurements - Balances of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value, Available for sale securities	$ 2,099,343	$ 1,630,567
Derivative assets	88,006	53,202
Derivative liabilities	82,219	51,605
U.S. Treasury [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value, Available for sale debt securities	29,994	29,796
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	401,078	367,994
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	525,630	495,830
Assets measured at fair value, Available for sale securities	525,630
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	1,096	1,190
Assets measured at fair value, Available for sale securities	1,096
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	3,673	4,287
Assets measured at fair value, Available for sale securities	3,673
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	39,804	11,057
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	8,908	14,286
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	235	225
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	2,097,593	1,628,719
Derivative assets	88,006	53,202
Derivative liabilities	82,219	51,605
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	1,515	1,623
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	2,098,048	1,629,271
Assets measured at fair value, Available for sale equity securities	1,295	1,296
Assets measured at fair value, Available for sale securities	2,099,343	1,630,567
Derivative assets	88,006	53,202
Assets measured at fair value, Total	2,187,349	1,683,769
Liabilities measured at fair value, Total	82,219	51,605
Fair Value, Measurements, Recurring [Member] | U.S. Treasury [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value, Available for sale debt securities	29,994	29,796
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	401,078	367,994
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	525,630	495,830
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	1,096	1,190
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	3,673	4,287
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	39,804	11,057
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	8,908	14,286
Fair Value, Measurements, Recurring [Member] | Trading Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	80,125	50,017
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	7,881	3,185
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	1,162	1,168
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	133	128
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	1,087,865	704,831
Fair Value, Measurements, Recurring [Member] | Trading Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	80,659	50,510
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	1,560	1,095
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	235	225
Assets measured at fair value, Available for sale securities	235	225
Assets measured at fair value, Total	235	225
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	102	97
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	133	128
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	2,096,957	1,628,087
Assets measured at fair value, Available for sale equity securities	636	632
Assets measured at fair value, Available for sale securities	2,097,593	1,628,719
Derivative assets	88,006	53,202
Assets measured at fair value, Total	2,185,599	1,681,921
Liabilities measured at fair value, Total	82,219	51,605
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | U.S. Treasury [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value, Available for sale debt securities	29,994	29,796
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	401,078	367,994
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	525,630	495,830
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	5	6
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	3,673	4,287
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	39,804	11,057
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	8,908	14,286
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	80,125	50,017
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	7,881	3,185
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	636	632
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	1,087,865	704,831
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	80,659	50,510
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	1,560	1,095
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	1,091	1,184
Assets measured at fair value, Available for sale equity securities	424	439
Assets measured at fair value, Available for sale securities	1,515	1,623
Assets measured at fair value, Total	1,515	1,623
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	1,091	1,184
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	$ 424	$ 439

Fair Value Measurements - Add94

Fair Value Measurements - Additional Information about Assets Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	$ 1,623	$ 1,895
Total gains (losses) - realized/unrealized, Included in earnings	0	0
Total gains (losses) - realized/unrealized, Included in other comprehensive income	(43)	16
Accretion included in earnings	2	5
Purchases	0	0
Issuances	0	0
Sales/redemptions	0	0
Settlements	(67)	(237)
Transfers from Level 3		(56)
Transfers into Level 3	0	0
Balance at end of period	1,515	1,623
Equity Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	439	475
Total gains (losses) - realized/unrealized, Included in earnings	0	0
Total gains (losses) - realized/unrealized, Included in other comprehensive income	(15)	20
Purchases	0	0
Issuances	0	0
Sales/redemptions	0	0
Transfers from Level 3		(56)
Transfers into Level 3	0	0
Balance at end of period	424	439
Residential Non-Agency Collateralized Mortgage Obligations [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	1,184	1,420
Total gains (losses) - realized/unrealized, Included in earnings	0	0
Total gains (losses) - realized/unrealized, Included in other comprehensive income	(28)	(4)
Accretion included in earnings	2	5
Purchases	0	0
Issuances	0	0
Sales/redemptions	0	0
Settlements	(67)	(237)
Transfers into Level 3	0	0
Balance at end of period	$ 1,091	$ 1,184

Fair Value Measurements - Add95

Fair Value Measurements - Additional Information about Assets Measured at Fair Value on Non-Recurring Basis (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	$ 6,012
Other real estate owned	2,016
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	8,214	$ 3,828
Other real estate owned	2,016	7,831
Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	957	124
Other real estate owned	1,148	5,705
Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	7,257	3,704
Other real estate owned	$ 868	$ 2,126

Fair Value Measurements - Fair

Fair Value Measurements - Fair Values of Corporation's Financial Instruments (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 345,945	$ 489,119	$ 234,246	$ 287,393
Securities available for sale	2,099,343	1,630,567
Securities held to maturity	1,776,020	1,637,061
Securities held to maturity	1,803,453	1,643,416
Derivative assets	88,006	53,202
Deposits	15,390,483	12,623,463
Short-term borrowings	1,563,888	2,048,896
Long-term borrowings	657,445	641,480
Derivative liabilities	82,219	51,605
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	345,945	489,119
Securities available for sale	2,099,343	1,630,567
Securities held to maturity	1,803,453	1,643,416
Net loans and leases, including loans held for sale	13,969,315	11,863,882
Derivative assets	88,006	53,202
Accrued interest receivable	53,609	44,920
Deposits	15,397,218	12,610,914
Short-term borrowings	1,563,947	2,048,943
Long-term borrowings	656,929	637,935
Derivative liabilities	82,219	51,605
Accrued interest payable	9,063	7,457
Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	345,945	489,119
Securities available for sale	2,099,343	1,630,567
Securities held to maturity	1,776,020	1,637,061
Net loans and leases, including loans held for sale	14,025,482	12,053,209
Derivative assets	88,006	53,202
Accrued interest receivable	53,609	44,920
Deposits	15,390,483	12,623,463
Short-term borrowings	1,563,888	2,048,896
Long-term borrowings	657,445	641,480
Derivative liabilities	82,219	51,605
Accrued interest payable	9,063	7,457
Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	345,945	489,119
Securities available for sale	235	225
Accrued interest receivable	53,609	44,920
Deposits	12,700,899	10,157,997
Short-term borrowings	1,563,947	2,048,943
Accrued interest payable	9,063	7,457
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available for sale	2,097,593	1,628,719
Securities held to maturity	1,801,022	1,640,721
Derivative assets	88,006	53,202
Deposits	2,696,319	2,452,917
Derivative liabilities	82,219	51,605
Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available for sale	1,515	1,623
Securities held to maturity	2,431	2,695
Net loans and leases, including loans held for sale	13,969,315	11,863,882
Long-term borrowings	$ 656,929	$ 637,935