F.N.B. (FNB) 10-Q 8 May 17 2017 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2017	Apr. 30, 2017
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q1
Trading Symbol	FNB
Entity Registrant Name	FNB CORP/PA/
Entity Central Index Key	37,808
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		323,100,407

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Assets
Cash and due from banks	$ 381,416	$ 303,526
Interest bearing deposits with banks	68,967	67,881
Cash and Cash Equivalents	450,383	371,407
Securities available for sale	2,638,815	2,231,987
Securities held to maturity (fair value of $2,886,897 and $2,294,777)	2,922,152	2,337,342
Loans held for sale (includes $11,121 and $0 measured at fair value) (1)	75,270	11,908
Loans and leases, net of unearned income of $58,877 and $52,723	20,177,650	14,896,943
Allowance for credit losses	(160,782)	(158,059)
Net Loans and Leases	20,016,868	14,738,884
Premises and equipment, net	355,436	243,956
Goodwill	2,250,305	1,032,129
Core deposit and other intangible assets, net	134,699	67,327
Bank owned life insurance	467,457	330,152
Other assets	879,310	479,725
Total Assets	30,190,695	21,844,817
Liabilities
Non-interest-bearing demand	5,537,679	4,205,337
Interest-bearing demand	9,285,393	6,931,381
Savings	2,623,531	2,352,434
Certificates and other time deposits	3,879,669	2,576,495
Total Deposits	21,326,272	16,065,647
Short-term borrowings	3,585,963	2,503,010
Long-term borrowings	696,206	539,494
Other liabilities	226,459	165,049
Total Liabilities	25,834,900	19,273,200
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 - 324,432,606 and 212,378,494 shares	3,246	2,125
Additional paid-in capital	4,020,527	2,234,366
Retained earnings	299,818	304,397
Accumulated other comprehensive loss	(56,969)	(61,369)
Treasury stock - 1,525,843 and 1,318,947 shares at cost	(17,709)	(14,784)
Total Stockholders' Equity	4,355,795	2,571,617
Total Liabilities and Stockholders' Equity	$ 30,190,695	$ 21,844,817

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands		Mar. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Securities held to maturity, fair value		$ 2,886,897	$ 2,294,777
Loans held for sale, fair value	[1]	11,121	0
Unearned income on loans		$ 58,877	$ 52,723
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		324,432,606	212,378,494
Treasury stock, shares		1,525,843	1,318,947
[1]	Amount represents loans for which we have elected the fair value option. See Note 17.

Consolidated Statements of Inco

Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Interest Income
Loans and leases, including fees	$ 168,629	$ 137,121
Securities:
Taxable	22,466	16,493
Tax-exempt	3,401	2,018
Dividends	9	5
Other	188	117
Total Interest Income	194,693	155,754
Interest Expense
Deposits	11,740	9,486
Short-term borrowings	6,674	2,361
Long-term borrowings	3,527	3,553
Total Interest Expense	21,941	15,400
Net Interest Income	172,752	140,354
Provision for credit losses	10,850	11,768
Net Interest Income After Provision for Credit Losses	161,902	128,586
Non-Interest Income
Service charges	24,807	21,134
Trust services	5,747	5,282
Insurance commissions and fees	5,141	4,921
Securities commissions and fees	3,623	3,374
Capital markets income	3,847	2,849
Mortgage banking operations	3,790	1,595
Bank owned life insurance	2,153	2,095
Net securities gains	2,625	71
Other	3,383	4,723
Total Non-Interest Income	55,116	46,044
Non-Interest Expense
Salaries and employee benefits	73,578	56,425
Net occupancy	11,349	9,266
Equipment	9,630	8,556
Amortization of intangibles	3,098	2,649
Outside services	13,043	9,303
FDIC insurance	5,387	3,968
Supplies	2,196	2,654
Bank shares and franchise taxes	2,980	2,617
Merger-related	52,724	24,940
Other	13,570	16,270
Total Non-Interest Expense	187,555	136,648
Income Before Income Taxes	29,463	37,982
Income taxes	6,484	11,850
Net Income	22,979	26,132
Preferred stock dividends	2,010	2,010
Net Income Available to Common Stockholders	$ 20,969	$ 24,122
Earnings per Common Share
Basic	$ 0.09	$ 0.12
Diluted	0.09	0.12
Cash Dividends per Common Share	$ 0.12	$ 0.12

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 22,979	$ 26,132
Securities available for sale:
Unrealized gains arising during the period, net of tax expense of $3,248 and $7,719	6,032	14,335
Reclassification adjustment for gains included in net income, net of tax expense of $424 and $25	(787)	(46)
Derivative instruments:
Unrealized (losses) gains arising during the period, net of tax (benefit) expense of $(550) and $1,693	(1,022)	3,145
Reclassification adjustment for gains included in net income, net of tax expense of $125 and $188	(233)	(349)
Pension and postretirement benefit obligations:
Unrealized gains arising during the period, net of tax expense of $221 and $214	410	397
Other comprehensive income	4,400	17,482
Comprehensive income	$ 27,379	$ 43,614

Consolidated Statements of Com6

Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Unrealized gains arising during the period, tax expense	$ 3,248	$ 7,719
Reclassification adjustment for gains included in net income, tax expense	424	25
Unrealized (losses) gains arising during the period, tax (benefit) expense	(550)	1,693
Reclassification adjustment for gains included in net income, tax expense	125	188
Unrealized gains arising during the period, tax expense	$ 221	$ 214

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, 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)
Balance at Dec. 31, 2016	2,571,617	106,882	2,125	2,234,366	304,397	(61,369)	(14,784)
Comprehensive income	27,379				22,979	4,400
Dividends declared:
Preferred stock	(2,010)				(2,010)
Common stock: $0.12/share	(25,548)				(25,548)
Issuance of common stock	(803)		5	2,117			(2,925)
Issuance of common stock - acquisitions	1,782,007		1,116	1,780,891
Assumption of warrant due to acquisition	1,394			1,394
Restricted stock compensation	1,759			1,759
Balance at Mar. 31, 2017	$ 4,355,795	$ 106,882	$ 3,246	$ 4,020,527	$ 299,818	$ (56,969)	$ (17,709)

Consolidated Statements of Sto8

Consolidated Statements of Stockholders' Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
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, 2017	Mar. 31, 2016
Operating Activities
Net income	$ 22,979	$ 26,132
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation, amortization and accretion	17,276	11,759
Provision for credit losses	10,850	11,768
Deferred tax expense	11,224	255
Net securities gains	(2,625)	(71)
Tax benefit of stock-based compensation	(720)	(277)
Loans originated for sale	(182,771)	(95,503)
Loans sold	135,405	94,765
Gain on sale of loans	(3,344)	(2,164)
Net change in:
Interest receivable	(1,527)	(109)
Interest payable	444	1,301
Bank owned life insurance	(1,962)	(1,850)
Other, net	13,403	47,865
Net cash flows provided by operating activities	18,632	93,871
Investing Activities
Net change in loans and leases	(208,958)	(122,982)
Securities available for sale:
Purchases	(492,227)	(510,271)
Sales	549,460	615,199
Maturities	119,867	170,266
Securities held to maturity:
Purchases	(531,560)	(217,574)
Sales	1,574
Maturities	119,324	77,369
Purchase of bank owned life insurance		(64)
Increase in premises and equipment	(23,186)	(13,878)
Net cash received in business combinations	197,682	46,854
Net cash flows (used in) provided by investing activities	(268,024)	44,919
Financing Activities
Demand (non-interest bearing and interest bearing) and savings accounts	73,291	411,857
Time deposits	11,421	28,558
Short-term borrowings	286,765	(687,409)
Proceeds from issuance of long-term borrowings	65,998	42,371
Repayment of long-term borrowings	(82,506)	(51,546)
Net proceeds from issuance of common stock	957	1,232
Tax benefit of stock-based compensation		277
Cash dividends paid:
Preferred stock	(2,010)	(2,010)
Common stock	(25,548)	(25,294)
Net cash flows (used in) provided by financing activities	328,368	(281,964)
Net Increase (Decrease) in Cash and Cash Equivalents	78,976	(143,174)
Cash and cash equivalents at beginning of period	371,407	489,119
Cash and Cash Equivalents at End of Period	$ 450,383	$ 345,945

Summary of Significant Accounti

Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2017
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Basis of Presentation Our accompanying consolidated financial statements and these notes to the financial statements include subsidiaries in which we have a controlling financial interest. We own and operate FNBPA, First National Trust Company, First National Investment Services Company, LLC, F.N.B. Investment Advisors, Inc., First National Insurance Agency, LLC (FNIA), Regency, Bank Capital Services, LLC and F.N.B. Capital Corporation, LLC, and include 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 our 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. Such reclassifications had no impact on our net income and stockholders’ equity. Events occurring subsequent to the date of the March 31, 2017 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 FNB 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 FNB’s Annual Report on Form 10-K Use of Estimates Our accounting and reporting policies conform with GAAP. The preparation of financial statements in conformity with GAAP requires us 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, accounting for acquired loans, fair value of financial instruments, goodwill and other intangible assets and income taxes. Loans Held for Sale and Loan Commitments Certain of our residential mortgage loans are originated for sale in the secondary mortgage loan market. Effective January 1, 2017, we made an automatic election to account for all future residential mortgage loans under the fair value option (FVO). The FVO election is intended to better reflect the underlying economics and better facilitate the economic hedging of the loans. The FVO is applied on an instrument by instrument basis and is an irrevocable election. Additionally, with the election of the FVO, fees and costs associated with the origination and acquisition of residential mortgage loans are expensed as incurred, rather than deferred. Changes in fair value under the FVO are recorded in mortgage banking operations income on the consolidated statements of income. Fair value is determined on the basis of rates obtained in the respective secondary market for the type of loan held for sale. Prior to the FVO election, loans were generally sold at a premium or discount from the carrying amount of the loan which represented the lower of cost or fair value. Gain or loss on the sale of loans is recorded in mortgage banking operations non-interest We routinely issue interest rate lock commitments for residential mortgage loans that we intend to sell. These interest rate lock commitments are considered derivatives. We also enter into loan sale commitments to sell these loans when funded to mitigate the risk that the market value of residential mortgage loans may decline between the time the rate commitment is issued to the customer and the time we sell the loan. These loan sale commitments are also derivatives. Both types of derivatives are recorded at fair value on the consolidated balance sheets with changes in fair value recorded in mortgage banking operations income. We also originate loans guaranteed by the Small Business Administration (SBA) for the purchase of businesses, business startups, business expansion, equipment, and working capital. All SBA loans are underwritten and documented as prescribed by the SBA. The portion of SBA loans originated that are guaranteed and intended for sale on the secondary market are classified as held for sale and are carried at the lower of cost or fair value. At the time of the sale, we allocate the carrying value of the entire loan between the guaranteed portion sold and the unguaranteed portion retained based on their relative fair value which results in a discount recorded on the retained portion of the loan. The guaranteed portion is typically sold at a premium and the gain is recognized in other income for any net premium received in excess of the relative fair value of the portion of the loan transferred. The net carrying value of the retained portion of the loans is included in the appropriate loan classification for disclosure purposes, primarily commercial real estate or commercial and industrial. Premises and Equipment Premises and equipment are stated at cost less accumulated depreciation. Depreciation is computed using the straight-line method over the asset’s estimated useful life. Leasehold improvements are expensed over the lesser of the asset’s estimated useful life or the term of the lease including renewal periods when reasonably assured. Useful lives are dependent upon the nature and condition of the asset and range from 3 to 40 years. Maintenance and repairs are charged to expense as incurred, while major improvements are capitalized and amortized to expense over the identified useful life. Premises and equipment are reviewed for impairment whenever events or changes in circumstances indicate that the carrying value may not be recoverable. Assets to be disposed of are transferred to other assets and are reported at the lower of the carrying amount or fair value less costs to sell. Goodwill and Other Intangible Assets Goodwill represents the excess of the cost of an acquisition over the fair value of the net assets acquired. Other intangible assets represent purchased assets that lack physical substance but can be distinguished from goodwill because of contractual or other legal rights. Intangible assets that have finite lives, such as core deposit intangibles, customer relationship intangibles and renewal lists, are amortized over their estimated useful lives and subject to periodic impairment testing. Core deposit intangibles are primarily amortized over ten years using accelerated methods. Customer renewal lists are amortized over their estimated useful lives which range from eight to thirteen years. Goodwill and other intangibles are subject to impairment testing at the reporting unit level, which must be conducted at least annually. We perform impairment testing during the fourth quarter of each year, or more frequently if impairment indicators exist. We also continue to monitor other intangibles for impairment and to evaluate carrying amounts, as necessary. We perform a quantitative assessment to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount. Prior to 2017, if, after assessing updated quantitative factors, we determined it was not more likely than not that the fair value of a reporting unit is less than its carrying amount, we did not have to perform the two-step Determining the fair value of a reporting unit under the first step of the goodwill impairment test and determining the fair value of individual assets and liabilities of a reporting unit under the second step of the goodwill impairment test are judgmental and often involve the use of significant estimates and assumptions. Similarly, estimates and assumptions are used in determining the fair value of other intangible assets. Estimates of fair value are primarily determined using discounted cash flows, market comparisons and recent transactions. These approaches use significant estimates and assumptions including projected future cash flows, discount rates reflecting the market rate of return, projected growth rates and determination and evaluation of appropriate market comparables. Based on the results of quantitative assessments of all reporting units, we concluded that no impairment existed at December 31, 2016. However, future events could cause us to conclude that goodwill or other intangibles have become impaired, which would result in recording an impairment loss. Any resulting impairment loss could have a material adverse impact on our financial condition and results of operations. Beginning in 2017, as permitted under the early adoption provisions of ASU 2017-04, Loan Servicing Rights We have two primary classes of servicing rights, residential mortgage loan servicing and SBA-guaranteed SBA-guaranteed We initially record servicing rights at fair value in core deposit and other intangible assets, net on the consolidated balance sheet. Subsequently, servicing rights are measured at the lower of cost or fair value. Servicing rights are amortized in proportion to, and over the period of, estimated net servicing income against servicing income during the period in mortgage banking operations income for residential mortgage loans and other income for SBA-guaranteed Mortgage servicing rights (MSRs) are separated into pools based on common risk characteristics of the underlying loans and evaluated for impairment at least quarterly. SBA-guaranteed SBA-guaranteed Bank-Owned Life Insurance (BOLI) We have purchased life insurance policies on certain current and former directors, officers and employees for which the Corporation is the owner and beneficiary. These policies are recorded in other assets in the consolidated balance sheet at their cash surrender value, or the amount that could be realized by surrendering the policies. Tax-exempt Low Income Housing Tax Credit Partnerships We invest in various affordable housing projects that qualify for low income housing tax credits (LIHTCs). The investments are recorded in other assets on the consolidated balance sheets. These investments generate a return through the realization of federal tax credits. We use the proportional amortization method to account for a majority of our investments in these entities. LIHTCs that do not meet the requirements of the proportional amortization method are recognized using the equity method. Our net investment in LIHTCs was $14.7 million and $14.0 million at March 31, 2017 and December 31, 2016, respectively. Per Share Amounts Earnings per common share is computed using net income available to common stockholders, which is net income adjusted for preferred stock dividends. Basic earnings per common share is calculated by dividing net income available to common stockholders by the weighted average number of shares of common stock outstanding, net of unvested shares of restricted stock. Diluted earnings per common share is calculated by dividing net income available to common stockholders by the weighted average number of shares of common stock outstanding, adjusted for the dilutive effect of potential common shares issuable for stock options, warrants and restricted shares, as calculated using the treasury stock method. Adjustments to net income available to common stockholders and the weighted average number of shares of common stock outstanding are made only when such adjustments dilute earnings per common share. Beginning in 2017, the assumed proceeds from applying the treasury stock method when computing diluted earnings per share excludes the amount of excess tax benefits that would have been recognized in accumulated paid-in Stock Based Compensation We account for our stock based compensation awards in accordance with ASC 718, Compensation - Stock Compensation, ASC 718 requires companies to estimate the fair value of stock-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 our consolidated statements 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 our plans contain performance targets that affect vesting and can be achieved after the requisite service period and are accounted for as performance conditions. 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 stock-based compensation expense is based on awards that are ultimately expected to vest, stock-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. Beginning in 2017, with the adoption of ASU 2016-09, 2016-09

New Accounting Standards

New Accounting Standards	3 Months Ended
	Mar. 31, 2017
Accounting Changes and Error Corrections [Abstract]
New Accounting Standards	2. NEW ACCOUNTING STANDARDS The following paragraphs summarize accounting pronouncements issued by the Financial Accounting Standards Board (FASB) that we recently adopted or will be adopting in the future. Securities Accounting Standards Update (ASU or Update) 2017-08, Receivables-Nonrefundable Fees and Other Costs (Subtopic 310-20): Retirement Benefits ASU 2017-07, Compensation—Retirement Benefits: Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost, Goodwill ASU 2017-04, Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment Business Combinations ASU 2017-01, Business Combinations (Topic 850): Clarifying the Definition of a Business Statement of Cash Flows ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments (a consensus of the Emerging Issues Task Force), Credit Losses ASU 2016-13 , Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments held-to-maturity off-balance available-for-sale Revenue Recognition ASU 2017-05, Other Income-Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20): ASU 2016-12, Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients, ASU 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), We expect to adopt ASU 2014-09 2014-09 non-interest out-of-scope 2014-09 2014-09. 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), 815-15-25-42. 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): Leases ASU 2016-02, Leases (Topic 842), Financial Instruments – Recognition and Measurement ASU 2016-01, Financial Instruments—Overall (Subtopic 825-10):

Mergers and Acquisitions

Mergers and Acquisitions	3 Months Ended
	Mar. 31, 2017
Business Combinations [Abstract]
Mergers and Acquisitions	3. MERGERS AND ACQUISITIONS Yadkin Financial Corporation On March 11, 2017, we completed our acquisition of Yadkin Financial Corporation (YDKN), a bank holding company based in Raleigh, North Carolina. YDKN’s banking affiliate, Yadkin Bank, was also merged into FNBPA on March 11, 2017. YDKN’s results of operations have been included in our consolidated statements of income since that date. The acquisition enabled us to enter the attractive North Carolina markets, including Raleigh, Charlotte and the Piedmont Triad, which is comprised of Winston-Salem, Greensboro and High Point. We also completed the core systems conversion activities during the quarter. On the acquisition date, the preliminary estimated fair values of YDKN included $6.8 billion in assets, $5.1 billion in loans and $5.2 billion in deposits. The acquisition was valued at $1.8 billion based on the acquisition date FNB common stock closing price of $15.97 and resulted in FNB issuing 111,619,975 shares of our common stock in exchange for 51,677,565 shares of YDKN common stock. Under the terms of the merger agreement, shareholders of YDKN received 2.16 shares of FNB common stock for each share of YDKN common stock and cash in lieu of fractional shares. YDKN’s fully vested and outstanding stock options and restricted stock awards were converted into options to purchase and receive FNB common stock. In conjunction with the acquisition, we assumed a warrant that was issued by YDKN to the U.S. Department of the Treasury (UST) under the Capital Purchase Program (CPP). Based on the exchange ratio, this warrant, which expires in 2019, was converted into a warrant to purchase up to 207,320 shares of FNB common stock with an exercise price of $9.63. The acquisition of YDKN constituted a business combination and has been accounted for using the acquisition method of accounting, and accordingly, assets acquired, liabilities assumed and consideration exchanged were recorded at estimated fair value on the acquisition date. The determination of estimated fair values required management to make certain estimates about discount rates, future expected cash flows, market conditions, and other future events that are highly subjective in nature and may require adjustments, which can be updated for up to a year following the acquisition. As of March 31, 2017, we continue to review information relating to events or circumstances existing at the acquisition date. Management anticipates that this review could result in adjustments to the preliminary acquisition date valuation amounts presented due to the relatively short timeframe between the March 11, 2017 closing date and quarter-end, Based on the preliminary purchase price allocation, we recorded $1.2 billion in goodwill and $55.7 million in core deposit intangibles as a result of the acquisition. The core deposit intangible asset is being amortized over the estimated useful life of approximately ten years utilizing an accelerated method. Goodwill is not amortized, but is periodically evaluated for impairment. None of the goodwill is deductible for income tax purposes. The following pro forma financial information for the periods presented reflects our estimated consolidated pro forma results of operations as if the YDKN acquisition occurred on January 1, 2016, unadjusted for potential cost savings and other business synergies we expect to receive as a result of the acquisition: (dollars in thousands, except per share data) FNB YDKN Pro Forma Pro Forma Three Months Ended March 31, 2017 Revenue (net interest income and non-interest $ 206,969 $ 74,574 $ (781 ) $ 280,762 Net income 51,253 22,435 (1,710 ) 71,978 Net income available to common stockholders 49,243 22,435 (1,710 ) 69,968 Earnings per common share – basic 0.23 0.43 — 0.22 Earnings per common share – diluted 0.23 0.43 — 0.22 Three Months Ended March 31, 2016 Revenue (net interest income and non-interest 186,398 74,709 (1,323 ) 259,784 Net income 26,132 15,447 (1,966 ) 39,613 Net income available to common stockholders 24,122 15,447 (1,966 ) 37,603 Earnings per common share – basic 0.12 0.30 — 0.12 Earnings per common share – diluted 0.12 0.30 — 0.12 The pro forma adjustments reflect amortization and associated taxes related to the preliminary purchase accounting adjustments made to record various acquired items at fair value. In connection with the YDKN acquisition, we incurred expenses related to systems conversions and other costs of integrating and conforming acquired operations with and into FNB. These merger-related expenses, that were expensed as incurred, amounted to $52.3 million for the three months ended March 31, 2017. Contract terminations and severance costs comprised 30.8% and 26.6%, respectively, of the merger-related expenses, with the remainder consisting of other non-interest paid-in Branch Purchase – Fifth Third Bank On April 22, 2016, we completed our purchase of 17 branch-banking locations and certain consumer loans in the Pittsburgh, Pennsylvania metropolitan area from Fifth Third Bank (Fifth Third). The fair value of the acquired assets totaled $312.4 million, including $198.9 million in cash, $95.4 million in loans and $14.1 million in fixed and other assets. We also assumed $302.5 million in deposits, for which we paid a deposit premium of 1.97%, as part of the transaction. The assets and liabilities relating to these purchased branches were recorded on our balance sheet at their fair values as of April 22, 2016, and the related results of operations for these branches have been included in our consolidated income statement since that date. We recorded $14.1 million in goodwill and $4.1 million in core deposit intangibles as a result of the purchase transaction. The goodwill for this transaction is deductible for income tax purposes. Metro Bancorp, Inc. On February 13, 2016, we completed our acquisition of Metro Bancorp, Inc. (METR), a bank holding company based in Harrisburg, Pennsylvania. The acquisition enhanced our distribution and scale across Central Pennsylvania, strengthened our position as the largest Pennsylvania-based regional bank and allowed us to leverage the significant infrastructure investments made in connection with the expansion of our product offerings and risk management systems. On the acquisition date, the fair values of METR included $2.8 billion in assets, $1.9 billion in loans and $2.3 billion in deposits. The acquisition was valued at $404.2 million and resulted in FNB issuing 34,041,181 shares of its common stock in exchange for 14,345,319 shares of METR common stock. We also acquired the fully vested outstanding stock options of METR. The assets and liabilities of METR were recorded on our consolidated balance sheet at their fair values as of the acquisition date and METR’s results of operations have been included in our consolidated income statement since that date. METR’s banking affiliate, Metro Bank, was merged into FNBPA on February 13, 2016. Based on the purchase price allocation, we recorded $185.1 million in goodwill and $24.2 million in core deposit intangibles as a result of the acquisition. None of the goodwill is deductible for income tax purposes as the acquisition is accounted for as a tax-free In connection with the METR acquisition, we incurred expenses related to systems conversions and other costs of integrating and conforming acquired operations with and into FNB. These merger-related charges, that were expensed as incurred, amounted to $0.4 million for the three months ended March 31, 2017 and $31.0 million for the year ended December 31, 2016. Severance costs comprised 39.9% of the merger-related expenses, with the remainder consisting of other non-interest paid-in The following table summarizes the amounts recorded on the consolidated balance sheets as of each of the acquisition dates in conjunction with the acquisitions discussed above: (in thousands) YDKN Fifth Third METR Fair value of consideration paid $ 1,783,366 $ — $ 404,242 Fair value of identifiable assets acquired: Cash and cash equivalents 197,682 198,872 46,890 Securities 940,634 — 722,980 Loans 5,116,497 95,354 1,862,447 Core deposit and other intangible assets 69,555 4,129 24,163 Fixed and other assets 460,752 14,069 127,185 Total identifiable assets acquired 6,785,120 312,424 2,783,665 Fair value of liabilities assumed: Deposits 5,176,758 302,529 2,328,238 Borrowings 969,385 — 227,539 Other liabilities 73,652 24,041 8,700 Total liabilities assumed 6,219,795 326,570 2,564,477 Fair value of net identifiable assets acquired 565,325 (14,146 ) 219,188 Goodwill recognized (1) $ 1,218,041 $ 14,146 $ 185,054 (1) All of the goodwill for these transactions has been recorded in the Community Banking Segment.

Securities

Securities	3 Months Ended
	Mar. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Securities	4. SECURITIES The amortized cost and fair value of securities are as follows: (in thousands) Amortized Cost Gross Gross Fair Value Securities Available for Sale (AFS): March 31, 2017 U.S. Treasury $ 29,908 $ 37 $ — $ 29,945 U.S. government-sponsored entities 397,634 676 (3,104 ) 395,206 Residential mortgage-backed securities: Agency mortgage-backed securities 1,650,743 3,024 (10,753 ) 1,643,014 Agency collateralized mortgage obligations 514,232 347 (10,616 ) 503,963 Non-agency 2 — — 2 Commercial mortgage-backed securities 420 — (1 ) 419 States of the U.S. and political subdivisions 34,763 69 (154 ) 34,678 Other debt securities 21,899 68 (373 ) 21,594 Total debt securities 2,649,601 4,221 (25,001 ) 2,628,821 Equity securities 9,479 612 (97 ) 9,994 Total securities available for sale $ 2,659,080 $ 4,833 $ (25,098 ) $ 2,638,815 December 31, 2016 U.S. Treasury $ 29,874 $ 79 $ — $ 29,953 U.S. government-sponsored entities 367,604 864 (3,370 ) 365,098 Residential mortgage-backed securities: Agency mortgage-backed securities 1,267,535 2,257 (16,994 ) 1,252,798 Agency collateralized mortgage obligations 546,659 419 (11,104 ) 535,974 Non-agency 891 6 — 897 Commercial mortgage-backed securities 1,292 — (1 ) 1,291 States of the U.S. and political subdivisions 36,065 86 (302 ) 35,849 Other debt securities 9,828 94 (435 ) 9,487 Total debt securities 2,259,748 3,805 (32,206 ) 2,231,347 Equity securities 273 367 — 640 Total securities available for sale $ 2,260,021 $ 4,172 $ (32,206 ) $ 2,231,987 Securities Held to Maturity (HTM): March 31, 2017 U.S. Treasury $ 500 $ 139 $ — $ 639 U.S. government-sponsored entities 247,580 395 (4,255 ) 243,720 Residential mortgage-backed securities: Agency mortgage-backed securities 1,243,947 7,382 (6,795 ) 1,244,534 Agency collateralized mortgage obligations 798,506 841 (17,003 ) 782,344 Commercial mortgage-backed securities 81,750 508 (302 ) 81,956 States of the U.S. and political subdivisions 549,869 2,686 (18,851 ) 533,704 Total securities held to maturity $ 2,922,152 $ 11,951 $ (47,206 ) $ 2,886,897 December 31, 2016 U.S. Treasury $ 500 $ 137 $ — $ 637 U.S. government-sponsored entities 272,645 348 (4,475 ) 268,518 Residential mortgage-backed securities: Agency mortgage-backed securities 852,215 5,654 (8,645 ) 849,224 Agency collateralized mortgage obligations 743,148 447 (17,801 ) 725,794 Non-agency 1,689 3 (6 ) 1,686 Commercial mortgage-backed securities 49,797 181 (226 ) 49,752 States of the U.S. and political subdivisions 417,348 1,456 (19,638 ) 399,166 Total securities held to maturity $ 2,337,342 $ 8,226 $ (50,791 ) $ 2,294,777 Gross gains and gross losses were realized on securities as follows: Three Months Ended March 31, (in thousands) 2017 2016 Gross gains $ 3,400 $ 71 Gross losses (775 ) — Net gains $ 2,625 $ 71 As of March 31, 2017, the amortized cost and fair value of securities, by contractual maturities, were as follows: Available for Sale Held to Maturity (in thousands) Amortized Fair Value Amortized Fair Value Due in one year or less $ 119,899 $ 120,041 $ 390 $ 396 Due from one to five years 330,197 327,741 253,707 249,830 Due from five to ten years 31,143 30,918 68,397 68,666 Due after ten years 2,965 2,723 475,455 459,171 484,204 481,423 797,949 778,063 Residential mortgage-backed securities: Agency mortgage-backed securities 1,650,743 1,643,014 1,243,947 1,244,534 Agency collateralized mortgage obligations 514,232 503,963 798,506 782,344 Non-agency 2 2 — — Commercial mortgage-backed securities 420 419 81,750 81,956 Equity securities 9,479 9,994 — — Total securities $ 2,659,080 $ 2,638,815 $ 2,922,152 $ 2,886,897 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. Following is information relating to securities pledged: March 31, December 31, (dollars in thousands) 2017 2016 Securities pledged (carrying value): To secure public deposits, trust deposits and for other purposes as required by law $ 3,145,072 $ 2,779,335 As collateral for short-term borrowings 323,658 322,038 Securities pledged as a percent of total securities 62.4 % 67.9 % Following are summaries of the fair values and unrealized losses of impaired securities, segregated by length of impairment: Less than 12 Months 12 Months or More Total (dollars in thousands) # Fair Value Unrealized # Fair Value Unrealized # Fair Value Unrealized Securities Available for Sale March 31, 2017 U.S. government-sponsored entities 13 $ 246,881 $ (3,104 ) — $ — $ — 13 $ 246,881 $ (3,104 ) Residential mortgage-backed securities: Agency mortgage-backed securities 56 1,176,464 (10,753 ) — — — 56 1,176,464 (10,753 ) Agency collateralized mortgage obligations 29 364,095 (6,990 ) 9 84,869 (3,626 ) 38 448,964 (10,616 ) Commercial mortgage-backed securities 1 419 (1 ) — — — 1 419 (1 ) States of the U.S. and political subdivisions 11 17,762 (72 ) 5 5,834 (82 ) 16 23,596 (154 ) Other debt securities — — — 3 4,534 (373 ) 3 4,534 (373 ) Equity securities 5 703 (97 ) — — — 5 703 (97 ) Total temporarily impaired securities AFS 115 $ 1,806,324 $ (21,017 ) 17 $ 95,237 $ (4,081 ) 132 $ 1,901,561 $ (25,098 ) December 31, 2016 U.S. government-sponsored entities 11 $ 211,636 $ (3,370 ) — $ — $ — 11 $ 211,636 $ (3,370 ) Residential mortgage-backed securities: Agency mortgage-backed securities 55 1,056,731 (16,994 ) — — — 55 1,056,731 (16,994 ) Agency collateralized mortgage obligations 26 346,662 (7,261 ) 9 89,040 (3,843 ) 35 435,702 (11,104 ) Commercial mortgage-backed securities 1 1,291 (1 ) — — — 1 1,291 (1 ) States of the U.S. and political subdivisions 20 28,631 (302 ) — — — 20 28,631 (302 ) Other debt securities — — — 3 4,470 (435 ) 3 4,470 (435 ) Total temporarily impaired securities AFS 113 $ 1,644,951 $ (27,928 ) 12 $ 93,510 $ (4,278 ) 125 $ 1,738,461 $ (32,206 ) Securities Held to Maturity March 31, 2017 U.S. government-sponsored entities 11 $ 200,745 $ (4,255 ) — $ — $ — 11 $ 200,745 $ (4,255 ) Residential mortgage-backed securities: Agency mortgage-backed securities 38 695,915 (6,795 ) — — — 38 695,915 (6,795 ) Agency collateralized mortgage obligations 29 498,743 (13,236 ) 12 107,546 (3,767 ) 41 606,289 (17,003 ) Commercial mortgage-backed securities 3 14,875 (67 ) 1 7,684 (235 ) 4 22,559 (302 ) States of the U.S. and political subdivisions 103 279,356 (18,851 ) — — — 103 279,356 (18,851 ) Total temporarily impaired securities HTM 184 $ 1,689,634 $ (43,204 ) 13 $ 115,230 $ (4,002 ) 197 $ 1,804,864 $ (47,206 ) December 31, 2016 U.S. government-sponsored entities 10 $ 185,525 $ (4,475 ) — $ — $ — 10 $ 185,525 $ (4,475 ) Residential mortgage-backed securities: Agency mortgage-backed securities 36 551,404 (8,645 ) — — — 36 551,404 (8,645 ) Agency collateralized mortgage obligations 29 516,237 (13,710 ) 12 112,690 (4,091 ) 41 628,927 (17,801 ) Non-agency 3 1,128 (6 ) — — — 3 1,128 (6 ) Commercial mortgage-backed securities 1 12,317 (10 ) 1 8,267 (216 ) 2 20,584 (226 ) States of the U.S. and political subdivisions 94 247,301 (19,638 ) — — — 94 247,301 (19,638 ) Total temporarily impaired securities HTM 173 $ 1,513,912 $ (46,484 ) 13 $ 120,957 $ (4,307 ) 186 $ 1,634,869 $ (50,791 ) We do not intend to sell the debt securities and it is not more likely than not that we will be required to sell the securities before recovery of their amortized cost basis. Other-Than-Temporary Impairment We evaluate our investment securities portfolio for other-than-temporary impairment (OTTI) on a quarterly basis. Impairment is assessed at the individual security level. We consider an investment security impaired if the fair value of the security is less than its cost or amortized cost basis. We did not recognize any OTTI losses on securities for the three months ended March 31, 2017 or 2016. States of the U.S. and Political Subdivisions Our municipal bond portfolio with a carrying amount of $584.5 million as of March 31, 2017 is highly rated with an average entity-specific rating of AA and 99.0% of the portfolio rated A or better. All of the securities in the municipal portfolio are general obligation bonds. Geographically, municipal bonds support our primary footprint as 69.7% of the securities are from municipalities located throughout Pennsylvania, Ohio, Maryland, North Carolina and South Carolina. The average holding size of the securities in the municipal bond portfolio is $2.3 million. In addition to the strong stand-alone ratings, 66.0% of the municipalities have some formal credit enhancement insurance that strengthens the creditworthiness of their issue. Management reviews the credit profile of each issuer on a quarterly basis.

Loans and Leases

Loans and Leases	3 Months Ended
	Mar. 31, 2017
Receivables [Abstract]
Loans and Leases	5. LOANS AND LEASES Following is a summary of loans and leases, net of unearned income: (in thousands) Originated Loans and Leases Acquired Loans Total Loans and March 31, 2017 Commercial real estate $ 4,262,270 $ 4,506,087 $ 8,768,357 Commercial and industrial 2,857,584 935,095 3,792,679 Commercial leases 197,071 — 197,071 Total commercial loans and leases 7,316,925 5,441,182 12,758,107 Direct installment 1,758,895 206,223 1,965,118 Residential mortgages 1,551,928 790,239 2,342,167 Indirect installment 1,259,770 177 1,259,947 Consumer lines of credit 1,100,695 705,301 1,805,996 Other 46,315 — 46,315 Total loans and leases, net of unearned income $ 13,034,528 $ 7,143,122 $ 20,177,650 December 31, 2016 Commercial real estate $ 4,095,817 $ 1,339,345 $ 5,435,162 Commercial and industrial 2,711,886 330,895 3,042,781 Commercial leases 196,636 — 196,636 Total commercial loans and leases 7,004,339 1,670,240 8,674,579 Direct installment 1,765,257 79,142 1,844,399 Residential mortgages 1,446,776 397,798 1,844,574 Indirect installment 1,196,110 203 1,196,313 Consumer lines of credit 1,099,627 201,573 1,301,200 Other 35,878 — 35,878 Total loans and leases, net of unearned income $ 12,547,987 $ 2,348,956 $ 14,896,943 The loans and leases portfolio categories are comprised of the following: • Commercial real estate includes both owner-occupied and non-owner-occupied • Commercial and industrial includes loans to businesses that are not secured by real estate; • Commercial leases consist of leases for new or used equipment; • Direct installment is comprised of fixed-rate, closed-end • Residential mortgages consist of conventional and jumbo mortgage loans for 1-4 • Indirect installment is comprised of loans originated by approved third parties and underwritten by us, 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; and • Other is comprised primarily of credit cards, mezzanine loans and student loans. The loans and leases portfolio consists principally of loans to individuals and small- and medium-sized The loans and leases portfolio also contains Regency consumer finance loans to individuals in Pennsylvania, Ohio, Tennessee and Kentucky. Due to the relative size of the Regency consumer finance loan portfolio, these loans are not segregated from other consumer loans. The following table shows certain information relating to the Regency consumer finance loans: March 31, December 31, (dollars in thousands) 2017 2016 Regency consumer finance loans $ 173,786 $ 184,687 Percent of total loans and leases 0.9 % 1.2 % The following table shows certain information relating to commercial real estate loans: March 31, December 31, (dollars in thousands) 2017 2016 Commercial construction loans $ 1,050,129 $ 459,995 Percent of total loans and leases 5.2 % 3.1 % Commercial real estate: Percent owner-occupied 37.4 % 36.2 % Percent non-owner-occupied 62.6 % 63.8 % Acquired Loans All acquired loans were initially recorded at fair value at the acquisition date. Refer to the Acquired Loans section in Note 1 of our 2016 Annual Report on Form 10-K 310-20 310-30 (in thousands) March 31, 2017 December 31, Accounted for under ASC 310-30: Outstanding balance $ 7,205,696 $ 2,346,687 Carrying amount 6,644,633 2,015,904 Accounted for under ASC 310-20: Outstanding balance 502,001 342,015 Carrying amount 491,921 325,784 Total acquired loans: Outstanding balance 7,707,697 2,688,702 Carrying amount 7,136,554 2,341,688 The outstanding balance is the undiscounted sum of all amounts owed under the loan, including amounts deemed principal, interest, fees, penalties and other, whether or not currently due and whether or not any such amounts have been written or charged-off. The carrying amount of purchased credit impaired loans included in the table above totaled $11.8 million at March 31, 2017 and $2.8 million at December 31, 2016, 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. 310-20 Three Months Ended March 31, (in thousands) 2017 2016 Balance at beginning of period $ 467,070 $ 256,120 Acquisitions 443,261 284,092 Reduction due to unexpected early payoffs (20,560 ) (9,375 ) Reclass from non-accretable 23,106 10,494 Disposals/transfers (36 ) (260 ) Accretion (25,241 ) (13,204 ) Balance at end of period $ 887,600 $ 527,867 Cash flows expected to be collected on acquired loans are estimated quarterly by incorporating several key assumptions similar to the initial estimate of fair value. These key assumptions include probability of default and the amount of actual prepayments after the acquisition date. Prepayments affect the estimated life of the loans and could change the amount of interest income, and possibly principal expected to be collected. In reforecasting future estimated cash flows, credit loss expectations are adjusted as necessary. Improved cash flow expectations for loans or pools are recorded first as a reversal of previously recorded impairment, if any, and then as an increase in prospective yield when all previously recorded impairment has been recaptured. Decreases in expected cash flows are recognized as impairment through a charge to the provision for credit losses and credit to the allowance for credit losses. During the three months ended March 31, 2017, there was an overall improvement in cash flow expectations which resulted in a net reclassification of $23.1 million from the non-accretable non-accretable The following table reflects amounts at acquisition for all purchased loans subject to ASC 310-30 non-impaired (in thousands) Acquired Acquired Performing Loans Total Contractually required cash flows at acquisition $ 48,941 $ 5,084,475 $ 5,133,416 Non-accretable (25,673 ) (406,802 ) (432,475 ) Cash flows expected to be collected at acquisition 23,268 4,677,673 4,700,941 Accretable yield (3,323 ) (439,938 ) (443,261 ) Fair value of acquired loans at acquisition $ 19,945 $ 4,237,735 $ 4,257,680 In addition, loans purchased in the YDKN acquisition that were not subject to ASC 310-30 Credit Quality Management monitors the credit quality of our loan and lease portfolio using several performance measures to do so based on payment activity and borrower performance. Non-performing non-accrual non-performing non-accrual non-accrual non-accrual non-accrual non-accrual non-accrual non-accrual Non-accrual Following is a summary of non-performing (dollars in thousands) March 31, 2017 December 31, Non-accrual $ 81,390 $ 65,479 Troubled debt restructurings 23,988 20,428 Total non-performing 105,378 85,907 Other real estate owned (OREO) 50,088 32,490 Total non-performing $ 155,466 $ 118,397 Asset quality ratios: Non-performing 0.52 % 0.58 % Non-performing 0.77 % 0.79 % Non-performing 0.51 % 0.54 % 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 $5.9 million at March 31, 2017 and $5.3 million at December 31, 2016. The recorded investment of consumer mortgage loans secured by residential real estate properties for which formal foreclosure proceedings are in process at March 31, 2017 and December 31, 2016 totaled $11.9 million and $12.0 million, respectively. The following tables provide an analysis of the aging of loans by class segregated by loans and leases originated and loans acquired: (in thousands) 30-89 Days Past Due ³ 90 Days Non- Accrual Total Past Due Current Total Loans and Originated Loans and Leases March 31, 2017 Commercial real estate $ 5,923 $ 1 $ 23,040 $ 28,964 $ 4,233,306 $ 4,262,270 Commercial and industrial 5,007 3 34,826 39,836 2,817,748 2,857,584 Commercial leases 1,039 — 2,017 3,056 194,015 197,071 Total commercial loans and leases 11,969 4 59,883 71,856 7,245,069 7,316,925 Direct installment 7,973 4,092 7,675 19,740 1,739,155 1,758,895 Residential mortgages 9,797 1,966 4,466 16,229 1,535,699 1,551,928 Indirect installment 5,678 374 1,488 7,540 1,252,230 1,259,770 Consumer lines of credit 2,739 375 1,782 4,896 1,095,799 1,100,695 Other 242 121 1,000 1,363 44,952 46,315 Total originated loans and leases $ 38,398 $ 6,932 $ 76,294 $ 121,624 $ 12,912,904 $ 13,034,528 December 31, 2016 Commercial real estate $ 8,452 $ 1 $ 20,114 $ 28,567 $ 4,067,250 $ 4,095,817 Commercial and industrial 16,019 3 24,141 40,163 2,671,723 2,711,886 Commercial leases 973 1 3,429 4,403 192,233 196,636 Total commercial loans and leases 25,444 5 47,684 73,133 6,931,206 7,004,339 Direct installment 10,573 4,386 6,484 21,443 1,743,814 1,765,257 Residential mortgages 10,594 3,014 3,316 16,924 1,429,852 1,446,776 Indirect installment 9,312 513 1,983 11,808 1,184,302 1,196,110 Consumer lines of credit 3,529 1,112 1,616 6,257 1,093,370 1,099,627 Other 398 83 1,000 1,481 34,397 35,878 Total originated loans and leases $ 59,850 $ 9,113 $ 62,083 $ 131,046 $ 12,416,941 $ 12,547,987 (in thousands) 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, 2017 Commercial real estate $ 41,450 $ 39,243 $ 1,414 $ 82,107 $ 4,630,159 $ (206,179 ) $ 4,506,087 Commercial and industrial 7,587 7,736 2,854 18,177 977,012 (60,094 ) 935,095 Total commercial loans 49,037 46,979 4,268 100,284 5,607,171 (266,273 ) 5,441,182 Direct installment 5,669 2,183 81 7,933 196,563 1,727 206,223 Residential mortgages 19,069 14,075 — 33,144 800,460 (43,365 ) 790,239 Indirect installment — 2 — 2 75 100 177 Consumer lines of credit 11,395 5,974 747 18,116 703,422 (16,237 ) 705,301 Total acquired loans $ 85,170 $ 69,213 $ 5,096 $ 159,479 $ 7,307,691 $ (324,048 ) $ 7,143,122 December 31, 2016 Commercial real estate $ 9,501 $ 23,890 $ 949 $ 34,340 $ 1,384,752 $ (79,747 ) $ 1,339,345 Commercial and industrial 1,789 2,942 2,111 6,842 353,494 (29,441 ) 330,895 Total commercial loans 11,290 26,832 3,060 41,182 1,738,246 (109,188 ) 1,670,240 Direct installment 2,317 1,344 — 3,661 73,479 2,002 79,142 Residential mortgages 8,428 10,816 — 19,244 416,561 (38,007 ) 397,798 Indirect installment 19 4 — 23 96 84 203 Consumer lines of credit 2,156 1,528 336 4,020 201,958 (4,405 ) 201,573 Total acquired loans $ 24,210 $ 40,524 $ 3,396 $ 68,130 $ 2,430,340 $ (149,514 ) $ 2,348,956 (1) Past due information for acquired loans is based on the contractual balance outstanding at March 31, 2017 and December 31, 2016. (2) Acquired loans are considered performing upon acquisition, regardless of whether the customer is contractually delinquent, as long as we can reasonably estimate the timing and amount of expected cash flows on such loans. In these instances, we do not consider acquired contractually delinquent loans to be non-accrual non-performing non-accrual non-performing non-accrual non-performing. We utilize the following categories to monitor credit quality within our 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. Our 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 our 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 our commercial loans and leases by credit quality category, segregated by loans and leases originated and loans acquired: Commercial Loan and Lease Credit Quality Categories (in thousands) Pass Special Substandard Doubtful Total Originated Loans and Leases March 31, 2017 Commercial real estate $ 4,068,403 $ 132,700 $ 60,958 $ 209 $ 4,262,270 Commercial and industrial 2,616,144 122,892 109,515 9,033 2,857,584 Commercial leases 190,641 3,711 2,719 — 197,071 Total originated commercial loans and leases $ 6,875,188 $ 259,303 $ 173,192 $ 9,242 $ 7,316,925 December 31, 2016 Commercial real estate $ 3,895,764 $ 130,452 $ 69,588 $ 13 $ 4,095,817 Commercial and industrial 2,475,955 104,652 128,089 3,190 2,711,886 Commercial leases 188,662 3,789 4,185 — 196,636 Total originated commercial loans and leases $ 6,560,381 $ 238,893 $ 201,862 $ 3,203 $ 7,004,339 Acquired Loans March 31, 2017 Commercial real estate $ 3,699,904 $ 531,316 $ 274,506 $ 361 $ 4,506,087 Commercial and industrial 786,808 77,961 70,171 155 935,095 Total acquired commercial loans $ 4,486,712 $ 609,277 $ 344,677 $ 516 $ 5,441,182 December 31, 2016 Commercial real estate $ 1,144,676 $ 85,894 $ 108,128 $ 647 $ 1,339,345 Commercial and industrial 274,819 20,593 34,967 516 330,895 Total acquired commercial loans $ 1,419,495 $ 106,487 $ 143,095 $ 1,163 $ 1,670,240 Credit quality information for acquired loans is based on the contractual balance outstanding at March 31, 2017 and December 31, 2016. We use 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 consumer loans by payment status: Consumer Loan Credit Quality by Payment Status (in thousands) Performing Non- Performing Total Originated loans March 31, 2017 Direct installment $ 1,742,702 $ 16,193 $ 1,758,895 Residential mortgages 1,537,779 14,149 1,551,928 Indirect installment 1,258,084 1,686 1,259,770 Consumer lines of credit 1,097,781 2,914 1,100,695 Total originated consumer loans $ 5,636,346 $ 34,942 $ 5,671,288 December 31, 2016 Direct installment $ 1,750,305 $ 14,952 $ 1,765,257 Residential mortgages 1,433,409 13,367 1,446,776 Indirect installment 1,193,930 2,180 1,196,110 Consumer lines of credit 1,096,642 2,985 1,099,627 Total originated consumer loans $ 5,474,286 $ 33,484 $ 5,507,770 Acquired loans March 31, 2017 Direct installment $ 206,138 $ 85 $ 206,223 Residential mortgages 788,656 1,583 790,239 Indirect installment 177 — 177 Consumer lines of credit 703,972 1,329 705,301 Total acquired consumer loans $ 1,698,943 $ 2,997 $ 1,701,940 December 31, 2016 Direct installment $ 79,142 $ — $ 79,142 Residential mortgages 397,798 — 397,798 Indirect installment 203 — 203 Consumer lines of credit 201,061 512 201,573 Total acquired consumer loans $ 678,204 $ 512 $ 678,716 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, we do not consider loans and leases for impairment unless a sustained period of delinquency (i.e., 90-plus non-accrual, Following is a summary of information pertaining to originated loans and leases considered to be impaired, by class of loan and lease: (in thousands) Unpaid Contractual Principal Balance Recorded Investment With No Specific Reserve Recorded Investment Specific Reserve Total Recorded Investment Specific Reserve Average Recorded Investment At or for the Three Months Ended March 31, 2017 Commercial real estate $ 27,470 $ 21,266 $ 1,795 $ 23,061 $ 209 $ 21,612 Commercial and industrial 36,889 12,055 22,299 34,354 9,038 29,065 Commercial leases 2,017 2,017 — 2,017 — 2,723 Total commercial loans and leases 66,376 35,338 24,094 59,432 9,247 53,400 Direct installment 18,062 16,193 — 16,193 — 15,572 Residential mortgages 15,151 14,149 — 14,149 — 13,758 Indirect installment 4,168 1,686 — 1,686 — 1,933 Consumer lines of credit 3,831 2,914 — 2,914 — 2,950 Other 1,000 1,000 — 1,000 — 1,000 Total $ 108,588 $ 71,280 $ 24,094 $ 95,374 $ 9,247 $ 88,613 At or for the Year Ended December 31, 2016 Commercial real estate $ 23,771 $ 19,699 $ 464 $ 20,163 $ 13 $ 19,217 Commercial and industrial 25,719 14,781 8,996 23,777 3,190 29,730 Commercial leases 3,429 3,429 — 3,429 — 3,394 Total commercial loans and leases 52,919 37,909 9,460 47,369 3,203 52,341 Direct installment 16,440 14,952 — 14,952 — 14,997 Residential mortgages 14,090 13,367 — 13,367 — 13,200 Indirect installment 5,172 2,180 — 2,180 — 2,037 Consumer lines of credit 3,858 2,985 — 2,985 — 2,813 Other 1,000 1,000 — 1,000 — 1,000 Total $ 93,479 $ 72,393 $ 9,460 $ 81,853 $ 3,203 $ 86,388 Interest income continued to accrue on certain impaired loans and totaled approximately $1.9 million and $1.2 million for the three months ended March 31, 2017 and 2016, respectively. The above tables do not reflect the additional allowance for credit losses relating to acquired loans in the following pools and categories: (in thousands) March 31, 2017 December 31, 2016 Commercial real estate $ 3,734 $ 4,538 Commercial and industrial 127 500 Total commercial loans 3,861 5,038 Direct installment 994 1,005 Residential mortgages 795 632 Indirect installment 221 221 Consumer lines of credit 697 372 Total allowance on acquired loans $ 6,568 $ 7,268 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 TDRs: (in thousands) Originated Acquired Total March 31, 2017 Accruing: Performing $ 17,552 $ 272 $ 17,824 Non-performing 19,659 4,329 23,988 Non-accrual 8,862 562 9,424 Total TDRs $ 46,073 $ 5,163 $ 51,236 December 31, 2016 Accruing: Performing $ 17,105 $ 365 $ 17,470 Non-performing 20,252 176 20,428 Non-accrual 9,035 — 9,035 Total TDRs $ 46,392 $ 541 $ 46,933 TDRs that are accruing and performing include loans that met the criteria for non-accrual non-performing non-accrual Excluding purchased impaired loans, commercial loans over $500,000 whose terms have been modified in a TDR are generally placed on non-accrual, charged-off (in thousands) March 31, 2017 December 31, Specific reserves for commercial TDRs $ 253 $ 291 Pooled reserves for individual loans under $500 234 276 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. Our allowance for credit losses included pooled reserves for these classes of loans of $3.7 million at both March 31, 2017 and December 31, 2016. Upon default of an individual loan, our charge-off The majority of TDRs are the result of interest rate concessions for a limited period of time. Following is a summary of loans, by class, that have been restructured: Three Months Ended March 31, 2017 Three Months Ended March 31, 2016 (dollars in thousands) 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 1 $ 114 $ 109 4 $ 778 $ 760 Commercial and industrial — — — 2 5,565 3,279 Total commercial loans 1 114 109 6 6,343 4,039 Direct installment 171 1,488 1,412 145 1,991 1,961 Residential mortgages 8 163 176 18 968 951 Indirect installment 5 17 14 3 11 12 Consumer lines of credit 22 742 729 20 243 238 Total 207 $ 2,524 $ 2,440 192 $ 9,556 $ 7,201 Following is a summary of originated TDRs, by class, for which there was a payment default, excluding loans that were either charged-off Three Months Ended March 31, 2017 Three Months Ended March 31, 2016 (dollars in thousands) Number of Contracts Recorded Investment Number of Contracts Recorded Investment Commercial real estate — $ — — $ — Commercial and industrial — — — — Total commercial loans — — — — Direct installment 29 82 28 175 Residential mortgages 2 224 1 50 Indirect installment 6 10 4 5 Consumer lines of credit 1 34 1 10 Total 38 $ 350 34 $ 240

Allowance for Credit Losses

Allowance for Credit Losses	3 Months Ended
	Mar. 31, 2017
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 sheets. 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: (in thousands) Balance at Beginning of Charge- Recoveries Net Charge- Provision Balance at End of Three Months Ended March 31, 2017 Commercial real estate $ 46,635 $ (988 ) $ 361 $ (627 ) $ 381 $ 46,389 Commercial and industrial 47,991 (2,463 ) 474 (1,989 ) 7,568 53,570 Commercial leases 3,280 (506 ) 1 (505 ) 738 3,513 Total commercial loans and leases 97,906 (3,957 ) 836 (3,121 ) 8,687 103,472 Direct installment 21,391 (2,874 ) 628 (2,246 ) 1,065 20,210 Residential mortgages 10,082 (180 ) 161 (19 ) 147 10,210 Indirect installment 10,564 (2,370 ) 781 (1,589 ) 655 9,630 Consumer lines of credit 9,456 (458 ) 165 (293 ) (280 ) 8,883 Other 1,392 (973 ) 327 (646 ) 1,063 1,809 Total allowance on originated loans and leases 150,791 (10,812 ) 2,898 (7,914 ) 11,337 154,214 Purchased credit-impaired loans 572 — — — 88 660 Other acquired loans 6,696 (482 ) 269 (213 ) (575 ) 5,908 Total allowance on acquired loans 7,268 (482 ) 269 (213 ) (487 ) 6,568 Total allowance $ 158,059 $ (11,294 ) $ 3,167 $ (8,127 ) $ 10,850 $ 160,782 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 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 (in thousands) Individually Evaluated for Impairment Collectively Evaluated for Impairment Loans and Individually Evaluated for Impairment Collectively Evaluated for Impairment March 31, 2017 Commercial real estate $ 209 $ 46,180 $ 4,262,270 $ 14,989 $ 4,247,281 Commercial and industrial 9,038 44,532 2,857,584 32,157 2,825,427 Commercial leases — 3,513 197,071 — 197,071 Total commercial loans and leases 9,247 94,225 7,316,925 47,146 7,269,779 Direct installment — 20,210 1,758,895 — 1,758,895 Residential mortgages — 10,210 1,551,928 — 1,551,928 Indirect installment — 9,630 1,259,770 — 1,259,770 Consumer lines of credit — 8,883 1,100,695 — 1,100,695 Other — 1,809 46,315 — 46,315 Total $ 9,247 $ 144,967 $ 13,034,528 $ 47,146 $ 12,987,382 December 31, 2016 Commercial real estate $ 13 $ 46,622 $ 4,095,817 $ 12,973 $ 4,082,844 Commercial and industrial 3,190 44,801 2,711,886 21,746 2,690,140 Commercial leases — 3,280 196,636 — 196,636 Total commercial loans and leases 3,203 94,703 7,004,339 34,719 6,969,620 Direct installment — 21,391 1,765,257 — 1,765,257 Residential mortgages — 10,082 1,446,776 — 1,446,776 Indirect installment — 10,564 1,196,110 — 1,196,110 Consumer lines of credit — 9,456 1,099,627 — 1,099,627 Other — 1,392 35,878 — 35,878 Total $ 3,203 $ 147,588 $ 12,547,987 $ 34,719 $ 12,513,268

Loan Servicing

Loan Servicing	3 Months Ended
	Mar. 31, 2017
Transfers and Servicing [Abstract]
Loan Servicing	7. LOAN SERVICING Mortgage Loan Servicing We retain the servicing rights on certain mortgage loans sold. The unpaid principal balance of mortgage loans serviced for others was $2.7 billion and $1.8 billion as of March 31, 2017 and December 31, 2016, respectively. Mortgage servicing fees, which include late fees and ancillary fees, are recorded in mortgage banking operations income in the consolidated statements of income, and totaled $1.6 million and $0.9 million, respectively, in the three months ended March 31, 2017 and 2016. Following is a summary of the MSR activity: Three Months Ended March 31, (in thousands) 2017 2016 Balance at beginning of period $ 13,521 $ 8,921 Fair value of MSRs acquired 8,553 — Additions 1,454 884 Payoffs and curtailments (139 ) (98 ) Amortization (523 ) (467 ) Balance at end of period $ 22,866 $ 9,240 Fair value, beginning of period $ 17,546 $ 11,503 Fair value, end of period 26,962 11,538 We did not have a valuation allowance for MSRs for either period presented in the table above. The fair value of MSRs is highly sensitive to changes in assumptions and is determined by estimating the present value of the asset’s future cash flows utilizing market-based prepayment rates, discount rates and other assumptions validated through comparison to trade information, industry surveys and with the use of independent third party appraisals. Changes in prepayment speed assumptions have the most significant impact on the fair value of MSRs. Generally, as interest rates decline, mortgage loan prepayments accelerate due to increased refinance activity, which results in a decrease in the fair value of the MSR. Measurement of fair value is limited to the conditions existing and the assumptions utilized as of a particular point in time, and those assumptions may not be appropriate if they are applied at a different time. Following is a summary of the sensitivity of the fair value of MSRs to changes in key assumptions: (dollars in thousands) March 31, 2017 December 31, Weighted average life (months) 82.2 79.0 Constant prepayment rate (annualized) 9.4 % 9.9 % Discount rate 9.7 % 9.8 % Effect on fair value due to change in interest rates: + 0.25% $ 1,229 $ 692 + 0.50% 2,298 1,288 - 0.25% (1,370 ) (789 ) - 0.50% (2,839 ) (1,680 ) The sensitivity calculations above are hypothetical and should not be considered to be predictive of future performance. Changes in fair value based on adverse changes in assumptions generally cannot be extrapolated because the relationship of the changes in assumptions to fair value may not be linear. Also, in this table, the effects of an adverse variation in a particular assumption on the fair value of the MSRs is calculated without changing any other assumptions, while in reality, changes in one factor may result in changing another, which may magnify or contract the effect of the change. SBA-Guaranteed Beginning in March 2017, as a result of the YDKN acquisition, we retain the servicing rights on SBA-guaranteed SBA-guaranteed Following is a summary of the activity in SBA servicing assets: Three Months ended March 31, 2017 (in thousands) Balance at beginning of period $ — Fair value of servicing rights acquired 5,399 Additions — Amortization (60 ) Balance at end of period $ 5,339 The fair value of the SBA servicing assets is compared to the amortized basis when certain triggering events occur. If the amortized basis exceeds the fair value, the asset is considered impaired and is written down to fair value through a valuation allowance on the asset and a charge against SBA income. We did not have a valuation allowance for SBA servicing assets as of March 31, 2017.

Borrowings

Borrowings	3 Months Ended
	Mar. 31, 2017
Debt Disclosure [Abstract]
Borrowings	8. BORROWINGS Following is a summary of short-term borrowings: (in thousands) March 31, 2017 December 31, Securities sold under repurchase agreements $ 310,751 $ 313,062 Federal Home Loan Bank advances 1,960,000 1,025,000 Federal funds purchased 1,185,000 1,037,000 Subordinated notes 130,212 127,948 Total short-term borrowings $ 3,585,963 $ 2,503,010 Borrowings with original maturities of one year or less are classified as short-term. 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: (in thousands) March 31, 2017 December 31, Federal Home Loan Bank advances $ 330,098 $ 305,110 Subordinated notes 87,558 87,147 Junior subordinated debt 109,987 48,600 Other subordinated debt 168,563 98,637 Total long-term borrowings $ 696,206 $ 539,494 Our banking affiliate has available credit with the FHLB of $6.9 billion of which $2.3 billion was utilized as of March 31, 2017. 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 1.03% to 4.19% for the three months ended March 31, 2017 and 0.95% to 4.19% for the year ended December 31, 2016. On May 1, 2017, we repaid $7.5 million in other subordinated debt that we acquired from YDKN. The junior subordinated debt is comprised of debt securities issued by FNB in relation to our six unconsolidated subsidiary trusts (collectively, the Trusts), which are unconsolidated variable interest entities. One hundred percent of the common equity of each Trust is owned by FNB. The Trusts were formed for the purpose of issuing FNB-obligated We record the distributions on the junior subordinated debt issued to the Trusts as interest expense. 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 our discretion. Under capital guidelines effective January 1, 2016, the junior subordinated debt, net of our investments in the Trusts, is included in tier 2 capital. We have entered into agreements which, when taken collectively, fully and unconditionally guarantee the obligations under the TPS subject to the terms of each of the guarantees. The following table provides information relating to the Trusts as of March 31, 2017: (dollars in thousands) Trust Preferred Securities Common Securities Junior Subordinated Debt Stated Maturity Date Interest Rate and Rate Reset Factor F.N.B. Statutory Trust II $ 21,500 $ 665 $ 22,165 6/15/36 2.78 % LIBOR + 165 basis points (bps) Omega Financial Capital Trust I 26,000 1,114 26,445 10/18/34 3.21 % LIBOR + 219 bps Yadkin Valley Statutory Trust I 25,000 774 20,677 12/15/37 2.45 % LIBOR + 132 bps FNB Financial Services Capital Trust I 25,000 774 21,635 9/30/35 2.59 % LIBOR + 146 bps American Community Capital Trust II 10,000 310 10,455 12/15/33 3.80 % LIBOR + 280 bps Crescent Financial Capital Trust I 8,000 248 8,610 10/07/33 4.12 % LIBOR + 310 bps Total $ 115,500 $ 3,885 $ 109,987

Derivative Instruments and Hedg

Derivative Instruments and Hedging Activities	3 Months Ended
	Mar. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments and Hedging Activities	9. DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES We are exposed to certain risks arising from both our business operations and economic conditions. We principally manage our exposures to a wide variety of business and operational risks through management of our core business activities. We manage economic risks, including interest rate risk, primarily by managing the amount, source, and duration of our 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. We also use derivative instruments to facilitate transactions on behalf of our customers. All derivatives are carried on the consolidated balance sheets at fair value and do not take into account the effects of master netting arrangements we have with other financial institutions. Credit risk is included in the determination of the estimated fair value of derivatives. Derivative assets are reported in the consolidated balance sheets in other assets and derivative liabilities are reported in the consolidated balance sheets in 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 our derivative assets and derivative liabilities: March 31, 2017 December 31, 2016 Notional Fair Value Notional Fair Value (in thousands) Amount Asset Liability Amount Asset Liability Gross Derivatives Subject to master netting arrangements: Interest rate contracts – designated $ 655,000 $ 603 $ 1,494 $ 450,000 $ 9,256 $ 1,171 Interest rate swaps – not designated 1,825,706 792 13,966 1,689,157 12,720 34,046 Equity contracts – not designated 1,180 46 — 1,180 61 — Total subject to master netting arrangements 2,481,886 1,441 15,460 2,140,337 22,037 35,217 Not subject to master netting arrangements: Interest rate swaps – not designated 1,825,706 30,263 13,820 1,689,157 32,170 11,866 Interest rate lock commitments – not designated 76,087 1,252 26 — — — Forward delivery commitments – not designated 85,065 20 376 — — — Credit risk contracts – not designated 186,037 15 106 174,538 13 123 Equity contracts – not designated 1,180 — 46 1,180 — 61 Total not subject to master netting arrangements 2,174,075 31,550 14,374 1,864,875 32,183 12,050 Total $ 4,655,961 $ 32,991 $ 29,834 $ 4,005,212 $ 54,220 $ 47,267 On January 3, 2017, the Chicago Mercantile Exchange (CME) enacted a rule-change which in effect results in the legal characterization of variation margin payments for certain derivative contracts as settlement of the derivatives mark-to-market Derivatives Designated as Hedging Instruments under GAAP Interest Rate Contracts. Following is a summary of key data related to interest rate contracts: (in thousands) March 31, 2017 December 31, Notional amount $ 655,000 $ 450,000 Fair value included in other assets 603 9,256 Fair value included in other liabilities 1,494 1,171 The following table shows amounts reclassified from accumulated other comprehensive income (AOCI) for the three months ended March 31, 2017: (in thousands) Total Net of Tax Reclassified from AOCI to interest income $ 506 $ 329 Reclassified from AOCI to interest expense 148 96 As of March 31, 2017, the maximum length of time over which forecasted interest cash flows are hedged is six years. In the twelve months that follow March 31, 2017, we expect to reclassify from the amount currently reported in AOCI net derivative gains of $128,000 ($82,000 net of tax), in association with interest on the hedged loans and FHLB advances. This amount could differ from amounts actually recognized due to changes in interest rates, hedge de-designations, 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, 2017 and 2016, there was no hedge ineffectiveness. Also, during the three months ended March 31, 2017 and 2016, 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. non-financial We enter into positions with a derivative counterparty in order to offset our exposure on the fixed components of the customer interest rate swap agreements. We seek 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. Following is a summary of key data related to interest rate swaps: (in thousands) March 31, 2017 December 31, Notional amount $ 3,651,412 $ 3,378,314 Fair value included in other assets 31,055 44,890 Fair value included in other liabilities 27,786 45,912 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 sheets with any resulting gain or loss recorded in current period earnings as other income or other expense. Interest Rate Lock Commitments . Forward Delivery Commitments . commitment-to-closing Credit Risk Contracts. Risk participation agreements sold with notional amounts totaling $133.9 million as of March 31, 2017 have remaining terms ranging from eight months to thirteen years. Under these agreements, our maximum exposure assuming a customer defaults on their obligation to perform under certain derivative swap contracts with third parties would be $105,000 and $123,000 at March 31, 2017 and December 31, 2016, respectively. The fair values of risk participation agreements purchased and sold were not material at March 31, 2017 and December 31, 2016. Counterparty Credit Risk We are party to master netting arrangements with most of our swap derivative counterparties. Collateral, usually marketable securities and/or cash, is exchanged between FNB and our counterparties, and is generally subject to thresholds and transfer minimums. For swap transactions that require central clearing, we post cash to our clearing agency. Collateral positions are valued daily, and adjustments to amounts received and pledged by us 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 we had breached our agreements with our derivative counterparties we would be required to settle our obligations under the agreements at the termination value and would be required to pay an additional $0.8 million and $1.1 million as of March 31, 2017 and December 31, 2016, 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: (in thousands) Gross Amount Gross Offset in the Net Amount March 31, 2017 Derivative Assets Subject to master netting arrangements: Interest rate contracts Designated $ 603 — $ 603 Not designated 792 — 792 Equity contracts – not designated 46 — 46 Not subject to master netting arrangements: Interest rate contracts – not designated 30,263 — 30,263 Interest rate lock commitments – not designated 1,252 — 1,252 Forward delivery commitments – not designated 20 — 20 Credit risk contracts – not designated 15 — 15 Total derivative assets $ 32,991 — $ 32,991 Derivative Liabilities Subject to master netting arrangements: Interest rate contracts Designated $ 1,494 — $ 1,494 Not designated 13,966 — 13,966 Not subject to master netting arrangements: Interest rate contracts – not designated 13,820 — 13,820 Interest rate lock commitments – not designated 26 — 26 Forward delivery commitments – not designated 376 — 376 Credit risk contracts – not designated 106 — 106 Equity contracts – not designated 46 — 46 Total derivative liabilities $ 29,834 — $ 29,834 (in thousands) Gross Amount Gross Amounts Offset in the Sheet Net Amount Presented in the Balance December 31, 2016 Derivative Assets Subject to master netting arrangements: Interest rate contracts Designated $ 9,256 — $ 9,256 Not designated 12,720 — 12,720 Equity contracts – not designated 61 — 61 Not subject to master netting arrangements: Interest rate contracts – not designated 32,170 — 32,170 Credit contracts – not designated 13 — 13 Total derivative assets $ 54,220 — $ 54,220 Derivative Liabilities Subject to master netting arrangements: Interest rate contracts Designated $ 1,171 — $ 1,171 Not designated 34,046 — 34,046 Not subject to master netting arrangements: Interest rate contracts – not designated 11,866 — 11,866 Credit contracts – not designated 123 — 123 Equity contracts – not designated 61 — 61 Total derivative liabilities $ 47,267 — $ 47,267 The following table presents a reconciliation of the net amounts of derivative assets and derivative liabilities presented in the balance sheets to the net amounts that would result in the event of offset: Amount Not Offset in the (in thousands) Net Amount the Balance Sheet Financial Cash Net Amount March 31, 2017 Derivative Assets Interest rate contracts: Designated $ 603 $ 603 — $ — Not designated 792 680 — 112 Equity contracts – not designated 46 46 — — Total $ 1,441 $ 1,329 — $ 112 Derivative Liabilities Interest rate contracts: Designated $ 1,494 $ 1,494 — $ — Not designated 13,966 13,208 — 758 Total $ 15,460 $ 14,702 — $ 758 December 31, 2016 Derivative Assets Interest rate contracts: Designated $ 9,256 $ 843 $ 8,413 $ — Not designated 12,720 474 12,132 114 Equity contracts – not designated 61 61 — — Total $ 22,037 $ 1,378 $ 20,545 $ 114 Derivative Liabilities Interest rate contracts: Designated $ 1,171 $ 1,171 $ — $ — Not designated 34,046 15,490 17,651 905 Total $ 35,217 $ 16,661 $ 17,651 $ 905 The following table presents the effect of certain derivative financial instruments on the income statement: Three Months Ended March 31, (in thousands) Income Statement Location 2017 2016 Interest Rate Contracts Interest income - loans and leases $ 506 $ 687 Interest Rate Contracts Interest expense – short-term borrowings 148 150 Interest Rate Swaps Other income (219 ) (41 ) Credit Risk Contracts Other income 19 (71 )

Commitments, Credit Risk and Co

Commitments, Credit Risk and Contingencies	3 Months Ended
	Mar. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments, Credit Risk and Contingencies	10. COMMITMENTS, CREDIT RISK AND CONTINGENCIES We have 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 sheets. Our exposure to credit loss in the event of non-performance Following is a summary of off-balance (in thousands) March 31, 2017 December 31, 2016 Commitments to extend credit $ 6,278,542 $ 4,424,834 Standby letters of credit 135,120 117,732 At March 31, 2017, funding of 69.5% of the commitments to extend credit was dependent on the financial condition of the customer. We have the ability to withdraw such commitments at our 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 us that may require payment at a future date. The credit risk involved in issuing letters of credit is actively monitored through review of the historical performance of our portfolios. In addition to the above commitments, subordinated notes issued by FNB Financial Services, LP, a wholly-owned finance subsidiary, are fully and unconditionally guaranteed by FNB. These subordinated notes are included in the summaries of short-term borrowings and long-term borrowings in Note 8. Other Legal Proceedings In the ordinary course of business, we are routinely named as defendants in, or made parties to, pending and potential legal actions. Also, as regulated entities, we are subject to governmental and regulatory examinations, information-gathering requests, investigations and proceedings (both formal and informal). Such threatened claims, litigation, investigations, regulatory and administrative proceedings typically entail matters that are considered incidental to the normal conduct of business. Claims for significant monetary damages may be asserted in many of these types of legal actions, while claims for disgorgement, restitution, penalties and/or other remedial actions or sanctions may be sought in regulatory matters. In these instances, if we determine that we have meritorious defenses, we will engage in an aggressive defense. However, if management determines, in consultation with counsel, that settlement of a matter is in the best interest of our Company and our shareholders, we may do so. 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, we do 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 our financial position or liquidity, 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 adverse reputational impact, if any, associated with each such matter. In accordance with applicable accounting guidance, we establish 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. We 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, we do 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. We believe that our accruals for legal proceedings are appropriate and, in the aggregate, are not material to the consolidated financial position, 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, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Incentive Plans	11. STOCK INCENTIVE PLANS Restricted Stock We issue restricted stock awards, consisting of both restricted stock and restricted stock units, to key employees under our Incentive Compensation Plans (Plans). Beginning in 2014, we issue 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 our common stock on the grant date. The fair value of the performance-based awards is based on a Monte-Carlo Simulation valuation of our common stock as of the grant date. We did not issue any performance-based restricted stock units during the first three months of 2017 or 2016. For performance-based restricted stock awards granted, the recipients will earn shares, totaling between 0% and 175% of the number of units issued, based on our total stockholder return relative to a specified peer group of financial institutions over the three-year period. These market-based restricted stock units are included in the table below as if the recipients earned shares equal to 100% of the units issued. Prior to 2014, more than half of the restricted stock awards granted to management were earned if we met or exceeded certain financial performance results when compared to our peers. These performance-related awards were expensed ratably from the date that the likelihood of meeting the performance measure was probable through the end of a four-year vesting period. The service-based awards were expensed ratably over a three-year vesting period. We also issued discretionary service-based awards to certain employees that vested over five years. As of March 31, 2017, we had available up to 2,997,769 shares of common stock to issue under these Plans. The unvested restricted stock awards are eligible to receive cash dividends or dividend equivalents which are ultimately used to purchase additional shares of stock and are subject to forfeiture if the requisite service period is not completed or the specified performance criteria are not met. These awards are subject to certain accelerated vesting provisions upon retirement, death, disability or in the event of a change of control as defined in the award agreements. The following table summarizes the activity relating to restricted stock awards during the periods indicated: Three Months Ended March 31, 2017 2016 Awards Weighted Average Grant Awards Weighted Average Grant Unvested awards outstanding at beginning of period 1,836,363 $ 12.97 1,548,444 $ 12.85 Vested (243,982 ) 11.83 (363,799 ) 12.07 Forfeited (2,950 ) 13.00 (6,368 ) 12.79 Dividend reinvestment 12,253 14.54 10,870 11.50 Unvested awards outstanding at end of period 1,601,684 13.16 1,189,147 13.08 The following table provides certain information related to restricted stock awards: (in thousands) Three Months Ended March 31, 2017 2016 Stock-based compensation expense $ 1,760 $ 1,136 Tax benefit related to stock-based compensation expense 616 398 Fair value of awards vested 3,802 4,424 As of March 31, 2017, there was $8.3 million of unrecognized compensation cost related to unvested restricted stock awards, including $0.4 million 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 (dollars in thousands) Service- Awards Performance- Based Awards Total Unvested restricted stock awards 830,140 771,544 1,601,684 Unrecognized compensation expense $ 3,784 $ 4,494 $ 8,278 Intrinsic value $ 12,344 $ 11,473 $ 23,817 Weighted average remaining life (in years) 1.72 1.77 1.75 Stock Options All outstanding stock options were assumed from acquisitions and are fully vested. Upon consummation of our acquisitions, all outstanding stock options issued by the acquired companies were converted into equivalent FNB stock options. We issue shares of treasury stock or authorized but unissued shares to satisfy stock options exercised. The following table summarizes the activity relating to stock options during the periods indicated: Three Months Ended March 31, 2017 2016 Shares Weighted Average Exercise Price Shares Weighted Average Exercise Price Options outstanding at beginning of period 892,532 $ 8.95 435,340 $ 8.86 Assumed from acquisitions 207,645 8.92 1,707,036 7.83 Exercised (131,792 ) 9.44 (24,806 ) 6.38 Forfeited (49,281 ) 10.91 (92,650 ) 6.69 Options outstanding and exercisable at end of period 919,104 8.77 2,024,920 8.12 The intrinsic value of outstanding and exercisable stock options at March 31, 2017 was $6.0 million. Warrants In conjunction with our participation in the UST’s CPP, we issued to the UST a warrant to purchase up to 1,302,083 shares of our 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 we 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 our common stock at an exercise price of $3.57 per share. Subsequent adjustments related to actual dividends paid by us have increased the share amount of these warrants to 392,475, with a resulting lower exercise price of $3.12 per share as of March 31, 2017. The warrant, which was recorded at its fair value on April 6, 2013, was sold at auction by the UST and expires in 2019. In conjunction with the YDKN acquisition on March 11, 2017, the warrant issued by YDKN to the UST under the CPP has been converted into a warrant to purchase up to 207,320 shares of our common stock at an exercise price of $9.63 per share. The warrant, which was recorded at its fair value on March 11, 2017, was sold at auction by the UST and expires in 2019.

Retirement Plans

Retirement Plans	3 Months Ended
	Mar. 31, 2017
Compensation and Retirement Disclosure [Abstract]
Retirement Plans	12. RETIREMENT PLANS Our 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, we match 100% of the first six percent that the employee defers. Additionally, we may provide a performance-based company contribution of up to three percent if we exceed annual financial goals. Our contribution expense is presented in the following table: Three Months Ended March 31, (in thousands) 2017 2016 401(k) contribution expense $ 2,767 $ 2,462 FNB 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. Additionally, we sponsor a qualified non-contributory non-qualified Three Months Ended March 31, (in thousands) 2017 2016 Service cost $ (4 ) $ (4 ) Interest cost 1,477 1,544 Expected return on plan assets (2,427 ) (2,353 ) Amortization: Unrecognized prior service cost 2 2 Unrecognized loss 628 608 Net periodic pension credit $ (324 ) $ (203 )

Other Comprehensive Income

Other Comprehensive Income	3 Months Ended
	Mar. 31, 2017
Equity [Abstract]
Other Comprehensive Income	13. OTHER COMPREHENSIVE INCOME The following table presents changes in AOCI, net of tax, by component: (in thousands) Unrealized Net Gains (Losses) on Securities Available for Sale Unrealized Net Gains Derivative Instruments Unrecognized Postretirement Obligations Total Three Months Ended March 31, 2017 Balance at beginning of period $ (18,222 ) $ 5,254 $ (48,401 ) $ (61,369 ) Other comprehensive income before reclassifications 6,032 (1,022 ) 410 5,420 Amounts reclassified from AOCI (787 ) (233 ) — (1,020 ) Net current period other comprehensive income 5,245 (1,255 ) 410 4,400 Balance at end of period $ (12,977 ) $ 3,999 $ (47,991 ) $ (56,969 ) The amounts reclassified from AOCI related to securities available for sale are included in net securities gains on the consolidated income statements, while the amounts reclassified from AOCI related to derivative instruments are included in interest income on loans and leases on the consolidated income statements. 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 income.

Earnings per Common Share

Earnings per Common Share	3 Months Ended
	Mar. 31, 2017
Earnings Per Share [Abstract]
Earnings per Common Share	14. 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, ( 2017 2016 Net income $ 22,979 $ 26,132 Less: Preferred stock dividends 2,010 2,010 Net income available to common stockholders $ 20,969 $ 24,122 Basic weighted average common shares outstanding 237,379,260 193,585,702 Net effect of dilutive stock options, warrants and restricted stock 1,875,389 1,292,220 Diluted weighted average common shares outstanding 239,254,649 194,877,922 Earnings per common share: Basic $ 0.09 $ 0.12 Diluted $ 0.09 $ 0.12 The following table shows the average shares excluded from the above calculation as their effect would have been anti-dilutive: Three Months Ended March 31, 2017 2016 Average shares excluded from the diluted earnings per common share calculation 81,755 15,501

Cash Flow Information

Cash Flow Information	3 Months Ended
	Mar. 31, 2017
Supplemental Cash Flow Elements [Abstract]
Cash Flow Information	15. CASH FLOW INFORMATION Following is a summary of supplemental cash flow information: Three Months Ended March 31, 2017 2016 (in thousands) Interest paid on deposits and other borrowings $ 18,606 $ 13,794 Income taxes paid — — Transfers of loans to other real estate owned 20,517 8,049 Financing of other real estate owned sold — 62

Business Segments

Business Segments	3 Months Ended
	Mar. 31, 2017
Segment Reporting [Abstract]
Business Segments	16. BUSINESS SEGMENTS We operate 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 subordinated notes, which are issued by a wholly-owned subsidiary and guaranteed by us. The following tables provide financial information for these segments of FNB. The information provided under the caption “Parent and Other” represents operations not considered to be reportable segments and/or general operating expenses of FNB, and includes the parent company, other non-bank (in thousands) Community Wealth Management Insurance Consumer Parent and Consolidated At or for the Three Months Ended March 31, 2017 Interest income $ 182,358 $ — $ 20 $ 9,902 $ 2,413 $ 194,693 Interest expense 18,865 — — 922 2,154 21,941 Net interest income 163,493 — 20 8,980 259 172,752 Provision for credit losses 8,198 — — 1,786 866 10,850 Non-interest 41,384 9,549 4,325 710 (852 ) 55,116 Non-interest 167,393 7,540 3,315 5,231 978 184,457 Amortization of intangibles 2,982 61 55 — — 3,098 Income tax expense (benefit) 6,148 711 347 1,067 (1,789 ) 6,484 Net income (loss) 20,156 1,237 628 1,606 (648 ) 22,979 Total assets 30,007,404 22,130 20,514 184,006 (43,359 ) 30,190,695 Total intangibles 2,360,557 10,353 12,285 1,809 — 2,385,004 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 31,233 8,816 4,194 716 1,085 46,044 Non-interest 118,048 7,089 3,301 5,204 357 133,999 Amortization of intangibles 2,441 65 143 — — 2,649 Income tax expense (benefit) 10,117 605 275 1,112 (259 ) 11,850 Net income 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 (1) Excludes amortization of intangibles, which is presented separately.

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2017
Fair Value Disclosures [Abstract]
Fair Value Measurements	17. FAIR VALUE MEASUREMENTS We use 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, we may be required to record at fair value other assets on a non-recurring 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, we use 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 we use for financial instruments recorded at fair value on either a recurring or non-recurring Securities Available For Sale Securities available for sale consist of both debt and equity securities. These securities are recorded at fair value on a recurring basis. At March 31, 2017, 99.5% 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 0.5% of these securities were measured using model-based techniques, with primarily unobservable (Level 3) inputs. We closely monitor 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. We use prices from independent pricing services and, to a lesser extent, indicative (non-binding) Derivative Financial Instruments We determine 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. We incorporate credit valuation adjustments to appropriately reflect both our own non-performance non-performance non-performance Although we have determined that the majority of the inputs used to value our derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with our derivatives and IRLCs utilize Level 3 inputs. Credit valuation estimates of current credit spreads are used to evaluate the likelihood of our default and the default of our counterparties. However, as of March 31, 2017, we have assessed the significance of the impact of the credit valuation adjustments on the overall valuation of our derivative positions and have determined that the credit valuation adjustments are not significant to the overall valuation of our derivatives. As a result, we have determined that our derivative valuations in their entirety are classified in Level 2 of the fair value hierarchy. The fair value of IRLCs is based upon the estimated fair value of the underlying mortgage loan, including the expected cash flows related to the MSRs and the estimated percentage of IRLCs that will result in a closed mortgage loan. Loans Held For Sale Beginning in 2017, residential mortgage loans held for sale are carried at fair value under the FVO. Prior to 2017, residential mortgage loans held for sale were carried at the lower of cost or fair value accounting, under which, periodically, it may have been necessary to record non-recurring SBA loans held for sale are carried under lower of cost or fair value accounting, for which, periodically, it may be necessary to record non-recurring Impaired Loans We reserve for commercial loan relationships greater than or equal to $500,000 that we consider impaired as defined in ASC 310 We determine 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 their 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. We 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, we classify these non-recurring We review and evaluate impaired loans no less frequently than quarterly for additional impairment based on the same factors identified above. Other Real Estate Owned OREO is comprised principally of commercial and residential real estate properties obtained in partial or total satisfaction of loan obligations. OREO acquired in settlement of indebtedness is 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 The following table presents the balances of assets and liabilities measured at fair value on a recurring basis: (in thousands) Level 1 Level 2 Level 3 Total March 31, 2017 Assets Measured at Fair Value Debt securities available for sale: U.S. Treasury $ — $ 29,945 $ — $ 29,945 U.S. government-sponsored entities — 395,206 — 395,206 Residential mortgage-backed securities: Agency mortgage-backed securities — 1,643,014 — 1,643,014 Agency collateralized mortgage obligations — 503,963 — 503,963 Non-agency — 2 — 2 Commercial mortgage-backed securities — 419 — 419 States of the U.S. and political subdivisions — 34,678 — 34,678 Other debt securities — 9,547 12,047 21,594 Total debt securities available for sale — 2,616,774 12,047 2,628,821 Equity securities available for sale: Fixed income mutual fund 3,723 5,353 — 9,076 Financial services industry — 760 — 760 Insurance services industry 158 — — 158 Total equity securities available for sale 3,881 6,113 — 9,994 Total securities available for sale 3,881 2,622,887 12,047 2,638,815 Loans held for sale — 11,121 — 11,121 Derivative financial instruments: Trading — 31,101 — 31,101 Not for trading — 638 1,252 1,890 Total derivative financial instruments — 31,739 1,252 32,991 Total assets measured at fair value on a recurring basis $ 3,881 $ 2,665,747 $ 13,299 $ 2,682,927 Liabilities Measured at Fair Value Derivative financial instruments: Trading — $ 27,832 — $ 27,832 Not for trading — 2,002 — 2,002 Total derivative financial instruments — 29,834 — 29,834 Total liabilities measured at fair value on a recurring basis — $ 29,834 — $ 29,834 (in thousands) Level 1 Level 2 Level 3 Total December 31, 2016 Assets Measured at Fair Value Debt securities available for sale: U.S. Treasury $ — $ 29,953 $ — $ 29,953 U.S. government-sponsored entities — 365,098 — 365,098 Residential mortgage-backed securities: Agency mortgage-backed securities — 1,252,798 — 1,252,798 Agency collateralized mortgage obligations — 535,974 — 535,974 Non-agency — 3 894 897 Commercial mortgage-backed securities — 1,291 — 1,291 States of the U.S. and political subdivisions — 35,849 — 35,849 Other debt securities — 9,487 — 9,487 Total debt securities available for sale — 2,230,453 894 2,231,347 Equity securities available for sale: Financial services industry — — 492 492 Insurance services industry 148 — — 148 Total equity securities available for sale 148 — 492 640 Total securities available for sale 148 2,230,453 1,386 2,231,987 Derivative financial instruments: Trading — 44,951 — 44,951 Not for trading — 9,269 — 9,269 Total derivative financial instruments — 54,220 — 54,220 Total assets measured at fair value on a recurring basis $ 148 $ 2,284,673 $ 1,386 $ 2,286,207 Liabilities Measured at Fair Value Derivative financial instruments: Trading — $ 45,973 — $ 45,973 Not for trading — 1,294 — 1,294 Total derivative financial instruments — 47,267 — 47,267 Total liabilities measured at fair value on a recurring basis — $ 47,267 — $ 47,267 The following table presents additional information about assets measured at fair value on a recurring basis and for which we have utilized Level 3 inputs to determine fair value: (in thousands) Other Debt Securities Equity Residential Non-Agency Collateralized Mortgage Obligations Interest Rate Lock Commitments Total Three Months Ended March 31, 2017 Balance at beginning of period $ — $ 492 $ 894 $ — $ 1,386 Total gains (losses) – realized/unrealized: Included in earnings — — 4 — 4 Included in other comprehensive income — 86 (6 ) — 80 Accretion included in earnings (1 ) — 1 — — Purchases, issuances, sales and settlements: Purchases 12,048 — — — 12,048 Issuances — — — — — Sales/redemptions — — (874 ) — (874 ) Settlements — — (19 ) — (19 ) Transfers from Level 3 — (578 ) — — (578 ) Transfers into Level 3 — — — 1,252 1,252 Balance at end of period $ 12,047 $ — $ — $ 1,252 $ 13,299 Year Ended December 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 — 53 (7 ) — 46 Accretion included in earnings — — 6 — 6 Purchases, issuances, sales and settlements: Purchases — — — — — Issuances — — — — — Sales/redemptions — — — — — Settlements — — (289 ) — (289 ) Transfers from Level 3 — — — — — Transfers into Level 3 — — — — — Balance at end of period $ — $ 492 $ 894 $ — $ 1,386 We review 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” discussion within this footnote for information relating to determining Level 3 fair values. During the first three months of 2017, we acquired $12.0 million in other debt securities from YDKN that are measured at Level 3. During the first three months of 2017, we transferred equity securities totaling $0.6 million from Level 3 to Level 2. There were no transfers of assets or liabilities between the hierarchy levels during the first three months of 2016. For the three months ended March 31, 2017 and 2016, 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 income. In accordance with GAAP, from time to time, we measure certain assets at fair value on a non-recurring non-recurring (in thousands) Level 1 Level 2 Level 3 Total March 31, 2017 Impaired loans — $ 1,812 $ 6,953 $ 8,765 Other real estate owned — 643 1,199 1,842 December 31, 2016 Impaired loans — $ 500 $ 5,883 $ 6,383 Other real estate owned — 11,017 3,181 14,198 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, 2017 and December 31, 2016, respectively. Consequently, the fair value information presented is not as of the period’s end. Impaired loans measured or re-measured non-recurring OREO with a carrying amount of $2.0 million was written down to $1.6 million (fair value of $1.8 million less estimated costs to sell of $0.2 million), resulting in a loss of $0.4 million, which was included in earnings for the three months ended March 31, 2017. 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. Loan Servicing Rights SBA-servicing Derivative Assets and Liabilities. Deposits. Short-Term Borrowings. Long-Term Borrowings. Loan Commitments and Standby Letters of Credit. off-balance non-binding, Nature of Estimates The fair values of our financial instruments are as follows: Fair Value Measurements (in thousands) Carrying Fair Value Level 1 Level 2 Level 3 March 31, 2017 Financial Assets Cash and cash equivalents $ 450,383 $ 450,383 $ 450,383 $ — $ — Securities available for sale 2,638,815 2,638,815 3,881 2,622,887 12,047 Securities held to maturity 2,922,152 2,886,897 — 2,886,897 — Net loans and leases (1) 20,092,138 19,823,712 — 11,121 19,812,591 Loan servicing rights 28,205 32,301 — — 32,301 Derivative assets 32,991 32,991 — 31,739 1,252 Accrued interest receivable 77,638 77,638 77,638 — — Financial Liabilities Deposits 21,326,272 21,298,707 17,446,603 3,852,104 — Short-term borrowings 3,585,963 3,586,486 3,586,486 — — Long-term borrowings 696,206 688,209 — — 688,209 Derivative liabilities 29,834 29,834 — 29,834 — Accrued interest payable 10,947 10,947 10,947 — — December 31, 2016 Financial Assets Cash and cash equivalents $ 371,407 $ 371,407 $ 371,407 $ — $ — Securities available for sale 2,231,987 2,231,987 148 2,230,453 1,386 Securities held to maturity 2,337,342 2,294,777 — 2,293,091 1,686 Net loans and leases (1) 14,750,792 14,446,274 — — 14,464,274 Loan servicing rights 13,521 17,546 — — 17,546 Derivative assets 54,220 54,220 — 54,220 — Accrued interest receivable 58,712 58,712 58,712 — — Financial Liabilities Deposits 16,065,647 16,045,323 13,489,152 2,556,171 — Short-term borrowings 2,503,010 2,503,277 2,503,277 — — Long-term borrowings 539,494 536,088 — — 536,088 Derivative liabilities 47,267 47,267 — 47,267 — Accrued interest payable 7,612 7,612 7,612 — — (1) Includes loans held for sale.

Summary of Significant Accoun27

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2017
Accounting Changes and Error Corrections [Abstract]
Basis of Presentation	Basis of Presentation Our accompanying consolidated financial statements and these notes to the financial statements include subsidiaries in which we have a controlling financial interest. We own and operate FNBPA, First National Trust Company, First National Investment Services Company, LLC, F.N.B. Investment Advisors, Inc., First National Insurance Agency, LLC (FNIA), Regency, Bank Capital Services, LLC and F.N.B. Capital Corporation, LLC, and include 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 our 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. Such reclassifications had no impact on our net income and stockholders’ equity. Events occurring subsequent to the date of the March 31, 2017 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 FNB 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 FNB’s Annual Report on Form 10-K
Use of Estimates	Use of Estimates Our accounting and reporting policies conform with GAAP. The preparation of financial statements in conformity with GAAP requires us 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, accounting for acquired loans, fair value of financial instruments, goodwill and other intangible assets and income taxes.
Loans Held for Sale and Loan Commitments	Loans Held for Sale and Loan Commitments Certain of our residential mortgage loans are originated for sale in the secondary mortgage loan market. Effective January 1, 2017, we made an automatic election to account for all future residential mortgage loans under the fair value option (FVO). The FVO election is intended to better reflect the underlying economics and better facilitate the economic hedging of the loans. The FVO is applied on an instrument by instrument basis and is an irrevocable election. Additionally, with the election of the FVO, fees and costs associated with the origination and acquisition of residential mortgage loans are expensed as incurred, rather than deferred. Changes in fair value under the FVO are recorded in mortgage banking operations income on the consolidated statements of income. Fair value is determined on the basis of rates obtained in the respective secondary market for the type of loan held for sale. Prior to the FVO election, loans were generally sold at a premium or discount from the carrying amount of the loan which represented the lower of cost or fair value. Gain or loss on the sale of loans is recorded in mortgage banking operations non-interest We routinely issue interest rate lock commitments for residential mortgage loans that we intend to sell. These interest rate lock commitments are considered derivatives. We also enter into loan sale commitments to sell these loans when funded to mitigate the risk that the market value of residential mortgage loans may decline between the time the rate commitment is issued to the customer and the time we sell the loan. These loan sale commitments are also derivatives. Both types of derivatives are recorded at fair value on the consolidated balance sheets with changes in fair value recorded in mortgage banking operations income. We also originate loans guaranteed by the Small Business Administration (SBA) for the purchase of businesses, business startups, business expansion, equipment, and working capital. All SBA loans are underwritten and documented as prescribed by the SBA. The portion of SBA loans originated that are guaranteed and intended for sale on the secondary market are classified as held for sale and are carried at the lower of cost or fair value. At the time of the sale, we allocate the carrying value of the entire loan between the guaranteed portion sold and the unguaranteed portion retained based on their relative fair value which results in a discount recorded on the retained portion of the loan. The guaranteed portion is typically sold at a premium and the gain is recognized in other income for any net premium received in excess of the relative fair value of the portion of the loan transferred. The net carrying value of the retained portion of the loans is included in the appropriate loan classification for disclosure purposes, primarily commercial real estate or commercial and industrial.
Premises and Equipment	Premises and Equipment Premises and equipment are stated at cost less accumulated depreciation. Depreciation is computed using the straight-line method over the asset’s estimated useful life. Leasehold improvements are expensed over the lesser of the asset’s estimated useful life or the term of the lease including renewal periods when reasonably assured. Useful lives are dependent upon the nature and condition of the asset and range from 3 to 40 years. Maintenance and repairs are charged to expense as incurred, while major improvements are capitalized and amortized to expense over the identified useful life. Premises and equipment are reviewed for impairment whenever events or changes in circumstances indicate that the carrying value may not be recoverable. Assets to be disposed of are transferred to other assets and are reported at the lower of the carrying amount or fair value less costs to sell.
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets Goodwill represents the excess of the cost of an acquisition over the fair value of the net assets acquired. Other intangible assets represent purchased assets that lack physical substance but can be distinguished from goodwill because of contractual or other legal rights. Intangible assets that have finite lives, such as core deposit intangibles, customer relationship intangibles and renewal lists, are amortized over their estimated useful lives and subject to periodic impairment testing. Core deposit intangibles are primarily amortized over ten years using accelerated methods. Customer renewal lists are amortized over their estimated useful lives which range from eight to thirteen years. Goodwill and other intangibles are subject to impairment testing at the reporting unit level, which must be conducted at least annually. We perform impairment testing during the fourth quarter of each year, or more frequently if impairment indicators exist. We also continue to monitor other intangibles for impairment and to evaluate carrying amounts, as necessary. We perform a quantitative assessment to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount. Prior to 2017, if, after assessing updated quantitative factors, we determined it was not more likely than not that the fair value of a reporting unit is less than its carrying amount, we did not have to perform the two-step Determining the fair value of a reporting unit under the first step of the goodwill impairment test and determining the fair value of individual assets and liabilities of a reporting unit under the second step of the goodwill impairment test are judgmental and often involve the use of significant estimates and assumptions. Similarly, estimates and assumptions are used in determining the fair value of other intangible assets. Estimates of fair value are primarily determined using discounted cash flows, market comparisons and recent transactions. These approaches use significant estimates and assumptions including projected future cash flows, discount rates reflecting the market rate of return, projected growth rates and determination and evaluation of appropriate market comparables. Based on the results of quantitative assessments of all reporting units, we concluded that no impairment existed at December 31, 2016. However, future events could cause us to conclude that goodwill or other intangibles have become impaired, which would result in recording an impairment loss. Any resulting impairment loss could have a material adverse impact on our financial condition and results of operations. Beginning in 2017, as permitted under the early adoption provisions of ASU 2017-04,
Loan Servicing Rights	Loan Servicing Rights We have two primary classes of servicing rights, residential mortgage loan servicing and SBA-guaranteed SBA-guaranteed We initially record servicing rights at fair value in core deposit and other intangible assets, net on the consolidated balance sheet. Subsequently, servicing rights are measured at the lower of cost or fair value. Servicing rights are amortized in proportion to, and over the period of, estimated net servicing income against servicing income during the period in mortgage banking operations income for residential mortgage loans and other income for SBA-guaranteed Mortgage servicing rights (MSRs) are separated into pools based on common risk characteristics of the underlying loans and evaluated for impairment at least quarterly. SBA-guaranteed SBA-guaranteed
Bank-Owned Life Insurance	Bank-Owned Life Insurance (BOLI) We have purchased life insurance policies on certain current and former directors, officers and employees for which the Corporation is the owner and beneficiary. These policies are recorded in other assets in the consolidated balance sheet at their cash surrender value, or the amount that could be realized by surrendering the policies. Tax-exempt
Low Income Housing Tax Credit Partnerships	Low Income Housing Tax Credit Partnerships We invest in various affordable housing projects that qualify for low income housing tax credits (LIHTCs). The investments are recorded in other assets on the consolidated balance sheets. These investments generate a return through the realization of federal tax credits. We use the proportional amortization method to account for a majority of our investments in these entities. LIHTCs that do not meet the requirements of the proportional amortization method are recognized using the equity method. Our net investment in LIHTCs was $14.7 million and $14.0 million at March 31, 2017 and December 31, 2016, respectively.
Per Share Amounts	Per Share Amounts Earnings per common share is computed using net income available to common stockholders, which is net income adjusted for preferred stock dividends. Basic earnings per common share is calculated by dividing net income available to common stockholders by the weighted average number of shares of common stock outstanding, net of unvested shares of restricted stock. Diluted earnings per common share is calculated by dividing net income available to common stockholders by the weighted average number of shares of common stock outstanding, adjusted for the dilutive effect of potential common shares issuable for stock options, warrants and restricted shares, as calculated using the treasury stock method. Adjustments to net income available to common stockholders and the weighted average number of shares of common stock outstanding are made only when such adjustments dilute earnings per common share. Beginning in 2017, the assumed proceeds from applying the treasury stock method when computing diluted earnings per share excludes the amount of excess tax benefits that would have been recognized in accumulated paid-in
Stock Based Compensation	Stock Based Compensation We account for our stock based compensation awards in accordance with ASC 718, Compensation - Stock Compensation, ASC 718 requires companies to estimate the fair value of stock-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 our consolidated statements 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 our plans contain performance targets that affect vesting and can be achieved after the requisite service period and are accounted for as performance conditions. 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 stock-based compensation expense is based on awards that are ultimately expected to vest, stock-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. Beginning in 2017, with the adoption of ASU 2016-09, 2016-09
New Accounting Standards	NEW ACCOUNTING STANDARDS The following paragraphs summarize accounting pronouncements issued by the Financial Accounting Standards Board (FASB) that we recently adopted or will be adopting in the future. Securities Accounting Standards Update (ASU or Update) 2017-08, Receivables-Nonrefundable Fees and Other Costs (Subtopic 310-20): Retirement Benefits ASU 2017-07, Compensation—Retirement Benefits: Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost, Goodwill ASU 2017-04, Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment Business Combinations ASU 2017-01, Business Combinations (Topic 850): Clarifying the Definition of a Business Statement of Cash Flows ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments (a consensus of the Emerging Issues Task Force), Credit Losses ASU 2016-13 , Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments held-to-maturity off-balance available-for-sale Revenue Recognition ASU 2017-05, Other Income-Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20): ASU 2016-12, Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients, ASU 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), We expect to adopt ASU 2014-09 2014-09 non-interest out-of-scope 2014-09 2014-09. 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), 815-15-25-42. 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): Leases ASU 2016-02, Leases (Topic 842), Financial Instruments – Recognition and Measurement ASU 2016-01, Financial Instruments—Overall (Subtopic 825-10):

Mergers and Acquisitions (Table

Mergers and Acquisitions (Tables)	3 Months Ended
	Mar. 31, 2017
Amounts Recorded on Consolidated Balance Sheets in Conjunction with Acquisition	The following table summarizes the amounts recorded on the consolidated balance sheets as of each of the acquisition dates in conjunction with the acquisitions discussed above: (in thousands) YDKN Fifth Third METR Fair value of consideration paid $ 1,783,366 $ — $ 404,242 Fair value of identifiable assets acquired: Cash and cash equivalents 197,682 198,872 46,890 Securities 940,634 — 722,980 Loans 5,116,497 95,354 1,862,447 Core deposit and other intangible assets 69,555 4,129 24,163 Fixed and other assets 460,752 14,069 127,185 Total identifiable assets acquired 6,785,120 312,424 2,783,665 Fair value of liabilities assumed: Deposits 5,176,758 302,529 2,328,238 Borrowings 969,385 — 227,539 Other liabilities 73,652 24,041 8,700 Total liabilities assumed 6,219,795 326,570 2,564,477 Fair value of net identifiable assets acquired 565,325 (14,146 ) 219,188 Goodwill recognized (1) $ 1,218,041 $ 14,146 $ 185,054 (1) All of the goodwill for these transactions has been recorded in the Community Banking Segment.
Yadkin Financial Corporation (YDKN) [Member]
Business Acquisition Pro Forma Information	The following pro forma financial information for the periods presented reflects our estimated consolidated pro forma results of operations as if the YDKN acquisition occurred on January 1, 2016, unadjusted for potential cost savings and other business synergies we expect to receive as a result of the acquisition: (dollars in thousands, except per share data) FNB YDKN Pro Forma Pro Forma Three Months Ended March 31, 2017 Revenue (net interest income and non-interest $ 206,969 $ 74,574 $ (781 ) $ 280,762 Net income 51,253 22,435 (1,710 ) 71,978 Net income available to common stockholders 49,243 22,435 (1,710 ) 69,968 Earnings per common share – basic 0.23 0.43 — 0.22 Earnings per common share – diluted 0.23 0.43 — 0.22 Three Months Ended March 31, 2016 Revenue (net interest income and non-interest 186,398 74,709 (1,323 ) 259,784 Net income 26,132 15,447 (1,966 ) 39,613 Net income available to common stockholders 24,122 15,447 (1,966 ) 37,603 Earnings per common share – basic 0.12 0.30 — 0.12 Earnings per common share – diluted 0.12 0.30 — 0.12

Securities (Tables)

Securities (Tables)	3 Months Ended
	Mar. 31, 2017
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: (in thousands) Amortized Cost Gross Gross Fair Value Securities Available for Sale (AFS): March 31, 2017 U.S. Treasury $ 29,908 $ 37 $ — $ 29,945 U.S. government-sponsored entities 397,634 676 (3,104 ) 395,206 Residential mortgage-backed securities: Agency mortgage-backed securities 1,650,743 3,024 (10,753 ) 1,643,014 Agency collateralized mortgage obligations 514,232 347 (10,616 ) 503,963 Non-agency 2 — — 2 Commercial mortgage-backed securities 420 — (1 ) 419 States of the U.S. and political subdivisions 34,763 69 (154 ) 34,678 Other debt securities 21,899 68 (373 ) 21,594 Total debt securities 2,649,601 4,221 (25,001 ) 2,628,821 Equity securities 9,479 612 (97 ) 9,994 Total securities available for sale $ 2,659,080 $ 4,833 $ (25,098 ) $ 2,638,815 December 31, 2016 U.S. Treasury $ 29,874 $ 79 $ — $ 29,953 U.S. government-sponsored entities 367,604 864 (3,370 ) 365,098 Residential mortgage-backed securities: Agency mortgage-backed securities 1,267,535 2,257 (16,994 ) 1,252,798 Agency collateralized mortgage obligations 546,659 419 (11,104 ) 535,974 Non-agency 891 6 — 897 Commercial mortgage-backed securities 1,292 — (1 ) 1,291 States of the U.S. and political subdivisions 36,065 86 (302 ) 35,849 Other debt securities 9,828 94 (435 ) 9,487 Total debt securities 2,259,748 3,805 (32,206 ) 2,231,347 Equity securities 273 367 — 640 Total securities available for sale $ 2,260,021 $ 4,172 $ (32,206 ) $ 2,231,987
Schedule of Amortized Cost and Fair Value of Securities Held to Maturity	Securities Held to Maturity (HTM): March 31, 2017 U.S. Treasury $ 500 $ 139 $ — $ 639 U.S. government-sponsored entities 247,580 395 (4,255 ) 243,720 Residential mortgage-backed securities: Agency mortgage-backed securities 1,243,947 7,382 (6,795 ) 1,244,534 Agency collateralized mortgage obligations 798,506 841 (17,003 ) 782,344 Commercial mortgage-backed securities 81,750 508 (302 ) 81,956 States of the U.S. and political subdivisions 549,869 2,686 (18,851 ) 533,704 Total securities held to maturity $ 2,922,152 $ 11,951 $ (47,206 ) $ 2,886,897 December 31, 2016 U.S. Treasury $ 500 $ 137 $ — $ 637 U.S. government-sponsored entities 272,645 348 (4,475 ) 268,518 Residential mortgage-backed securities: Agency mortgage-backed securities 852,215 5,654 (8,645 ) 849,224 Agency collateralized mortgage obligations 743,148 447 (17,801 ) 725,794 Non-agency 1,689 3 (6 ) 1,686 Commercial mortgage-backed securities 49,797 181 (226 ) 49,752 States of the U.S. and political subdivisions 417,348 1,456 (19,638 ) 399,166 Total securities held to maturity $ 2,337,342 $ 8,226 $ (50,791 ) $ 2,294,777
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, (in thousands) 2017 2016 Gross gains $ 3,400 $ 71 Gross losses (775 ) — Net gains $ 2,625 $ 71
Amortized Cost and Fair Value of Securities, by Contractual Maturities	As of March 31, 2017, the amortized cost and fair value of securities, by contractual maturities, were as follows: Available for Sale Held to Maturity (in thousands) Amortized Fair Value Amortized Fair Value Due in one year or less $ 119,899 $ 120,041 $ 390 $ 396 Due from one to five years 330,197 327,741 253,707 249,830 Due from five to ten years 31,143 30,918 68,397 68,666 Due after ten years 2,965 2,723 475,455 459,171 484,204 481,423 797,949 778,063 Residential mortgage-backed securities: Agency mortgage-backed securities 1,650,743 1,643,014 1,243,947 1,244,534 Agency collateralized mortgage obligations 514,232 503,963 798,506 782,344 Non-agency 2 2 — — Commercial mortgage-backed securities 420 419 81,750 81,956 Equity securities 9,479 9,994 — — Total securities $ 2,659,080 $ 2,638,815 $ 2,922,152 $ 2,886,897
Schedule of Securities Pledged as Collateral	Following is information relating to securities pledged: March 31, December 31, (dollars in thousands) 2017 2016 Securities pledged (carrying value): To secure public deposits, trust deposits and for other purposes as required by law $ 3,145,072 $ 2,779,335 As collateral for short-term borrowings 323,658 322,038 Securities pledged as a percent of total securities 62.4 % 67.9 %
Summaries of Fair Values and Unrealized Losses of Impaired Securities, Segregated by Length of Impairment	Following are summaries of the fair values and unrealized losses of impaired securities, segregated by length of impairment: Less than 12 Months 12 Months or More Total (dollars in thousands) # Fair Value Unrealized # Fair Value Unrealized # Fair Value Unrealized Securities Available for Sale March 31, 2017 U.S. government-sponsored entities 13 $ 246,881 $ (3,104 ) — $ — $ — 13 $ 246,881 $ (3,104 ) Residential mortgage-backed securities: Agency mortgage-backed securities 56 1,176,464 (10,753 ) — — — 56 1,176,464 (10,753 ) Agency collateralized mortgage obligations 29 364,095 (6,990 ) 9 84,869 (3,626 ) 38 448,964 (10,616 ) Commercial mortgage-backed securities 1 419 (1 ) — — — 1 419 (1 ) States of the U.S. and political subdivisions 11 17,762 (72 ) 5 5,834 (82 ) 16 23,596 (154 ) Other debt securities — — — 3 4,534 (373 ) 3 4,534 (373 ) Equity securities 5 703 (97 ) — — — 5 703 (97 ) Total temporarily impaired securities AFS 115 $ 1,806,324 $ (21,017 ) 17 $ 95,237 $ (4,081 ) 132 $ 1,901,561 $ (25,098 ) December 31, 2016 U.S. government-sponsored entities 11 $ 211,636 $ (3,370 ) — $ — $ — 11 $ 211,636 $ (3,370 ) Residential mortgage-backed securities: Agency mortgage-backed securities 55 1,056,731 (16,994 ) — — — 55 1,056,731 (16,994 ) Agency collateralized mortgage obligations 26 346,662 (7,261 ) 9 89,040 (3,843 ) 35 435,702 (11,104 ) Commercial mortgage-backed securities 1 1,291 (1 ) — — — 1 1,291 (1 ) States of the U.S. and political subdivisions 20 28,631 (302 ) — — — 20 28,631 (302 ) Other debt securities — — — 3 4,470 (435 ) 3 4,470 (435 ) Total temporarily impaired securities AFS 113 $ 1,644,951 $ (27,928 ) 12 $ 93,510 $ (4,278 ) 125 $ 1,738,461 $ (32,206 ) Securities Held to Maturity March 31, 2017 U.S. government-sponsored entities 11 $ 200,745 $ (4,255 ) — $ — $ — 11 $ 200,745 $ (4,255 ) Residential mortgage-backed securities: Agency mortgage-backed securities 38 695,915 (6,795 ) — — — 38 695,915 (6,795 ) Agency collateralized mortgage obligations 29 498,743 (13,236 ) 12 107,546 (3,767 ) 41 606,289 (17,003 ) Commercial mortgage-backed securities 3 14,875 (67 ) 1 7,684 (235 ) 4 22,559 (302 ) States of the U.S. and political subdivisions 103 279,356 (18,851 ) — — — 103 279,356 (18,851 ) Total temporarily impaired securities HTM 184 $ 1,689,634 $ (43,204 ) 13 $ 115,230 $ (4,002 ) 197 $ 1,804,864 $ (47,206 ) December 31, 2016 U.S. government-sponsored entities 10 $ 185,525 $ (4,475 ) — $ — $ — 10 $ 185,525 $ (4,475 ) Residential mortgage-backed securities: Agency mortgage-backed securities 36 551,404 (8,645 ) — — — 36 551,404 (8,645 ) Agency collateralized mortgage obligations 29 516,237 (13,710 ) 12 112,690 (4,091 ) 41 628,927 (17,801 ) Non-agency 3 1,128 (6 ) — — — 3 1,128 (6 ) Commercial mortgage-backed securities 1 12,317 (10 ) 1 8,267 (216 ) 2 20,584 (226 ) States of the U.S. and political subdivisions 94 247,301 (19,638 ) — — — 94 247,301 (19,638 ) Total temporarily impaired securities HTM 173 $ 1,513,912 $ (46,484 ) 13 $ 120,957 $ (4,307 ) 186 $ 1,634,869 $ (50,791 )

Loans and Leases (Tables)

Loans and Leases (Tables)	3 Months Ended
	Mar. 31, 2017
Receivables [Abstract]
Summary of Loans and Leases, Net of Unearned Income	Following is a summary of loans and leases, net of unearned income: (in thousands) Originated Loans and Leases Acquired Loans Total Loans and March 31, 2017 Commercial real estate $ 4,262,270 $ 4,506,087 $ 8,768,357 Commercial and industrial 2,857,584 935,095 3,792,679 Commercial leases 197,071 — 197,071 Total commercial loans and leases 7,316,925 5,441,182 12,758,107 Direct installment 1,758,895 206,223 1,965,118 Residential mortgages 1,551,928 790,239 2,342,167 Indirect installment 1,259,770 177 1,259,947 Consumer lines of credit 1,100,695 705,301 1,805,996 Other 46,315 — 46,315 Total loans and leases, net of unearned income $ 13,034,528 $ 7,143,122 $ 20,177,650 December 31, 2016 Commercial real estate $ 4,095,817 $ 1,339,345 $ 5,435,162 Commercial and industrial 2,711,886 330,895 3,042,781 Commercial leases 196,636 — 196,636 Total commercial loans and leases 7,004,339 1,670,240 8,674,579 Direct installment 1,765,257 79,142 1,844,399 Residential mortgages 1,446,776 397,798 1,844,574 Indirect installment 1,196,110 203 1,196,313 Consumer lines of credit 1,099,627 201,573 1,301,200 Other 35,878 — 35,878 Total loans and leases, net of unearned income $ 12,547,987 $ 2,348,956 $ 14,896,943
Certain Information Relating to Regency Consumer Finance Loans	The following table shows certain information relating to the Regency consumer finance loans: March 31, December 31, (dollars in thousands) 2017 2016 Regency consumer finance loans $ 173,786 $ 184,687 Percent of total loans and leases 0.9 % 1.2 %
Certain Information Relating to Commercial Real Estate Loans	The following table shows certain information relating to commercial real estate loans: March 31, December 31, (dollars in thousands) 2017 2016 Commercial construction loans $ 1,050,129 $ 459,995 Percent of total loans and leases 5.2 % 3.1 % Commercial real estate: Percent owner-occupied 37.4 % 36.2 % Percent non-owner-occupied 62.6 % 63.8 %
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 sheets are as follows: (in thousands) March 31, 2017 December 31, Accounted for under ASC 310-30: Outstanding balance $ 7,205,696 $ 2,346,687 Carrying amount 6,644,633 2,015,904 Accounted for under ASC 310-20: Outstanding balance 502,001 342,015 Carrying amount 491,921 325,784 Total acquired loans: Outstanding balance 7,707,697 2,688,702 Carrying amount 7,136,554 2,341,688
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. 310-20 Three Months Ended March 31, (in thousands) 2017 2016 Balance at beginning of period $ 467,070 $ 256,120 Acquisitions 443,261 284,092 Reduction due to unexpected early payoffs (20,560 ) (9,375 ) Reclass from non-accretable 23,106 10,494 Disposals/transfers (36 ) (260 ) Accretion (25,241 ) (13,204 ) Balance at end of period $ 887,600 $ 527,867
Summary of Acquisition of Purchased Loans	The following table reflects amounts at acquisition for all purchased loans subject to ASC 310-30 non-impaired (in thousands) Acquired Acquired Performing Loans Total Contractually required cash flows at acquisition $ 48,941 $ 5,084,475 $ 5,133,416 Non-accretable (25,673 ) (406,802 ) (432,475 ) Cash flows expected to be collected at acquisition 23,268 4,677,673 4,700,941 Accretable yield (3,323 ) (439,938 ) (443,261 ) Fair value of acquired loans at acquisition $ 19,945 $ 4,237,735 $ 4,257,680
Summary of Non-Performing Assets	Following is a summary of non-performing (dollars in thousands) March 31, 2017 December 31, Non-accrual $ 81,390 $ 65,479 Troubled debt restructurings 23,988 20,428 Total non-performing 105,378 85,907 Other real estate owned (OREO) 50,088 32,490 Total non-performing $ 155,466 $ 118,397 Asset quality ratios: Non-performing 0.52 % 0.58 % Non-performing 0.77 % 0.79 % Non-performing 0.51 % 0.54 %
Age Analysis of Past Due Loans, by Class	The following tables provide an analysis of the aging of loans by class segregated by loans and leases originated and loans acquired: (in thousands) 30-89 Days Past Due ³ 90 Days Non- Accrual Total Past Due Current Total Loans and Originated Loans and Leases March 31, 2017 Commercial real estate $ 5,923 $ 1 $ 23,040 $ 28,964 $ 4,233,306 $ 4,262,270 Commercial and industrial 5,007 3 34,826 39,836 2,817,748 2,857,584 Commercial leases 1,039 — 2,017 3,056 194,015 197,071 Total commercial loans and leases 11,969 4 59,883 71,856 7,245,069 7,316,925 Direct installment 7,973 4,092 7,675 19,740 1,739,155 1,758,895 Residential mortgages 9,797 1,966 4,466 16,229 1,535,699 1,551,928 Indirect installment 5,678 374 1,488 7,540 1,252,230 1,259,770 Consumer lines of credit 2,739 375 1,782 4,896 1,095,799 1,100,695 Other 242 121 1,000 1,363 44,952 46,315 Total originated loans and leases $ 38,398 $ 6,932 $ 76,294 $ 121,624 $ 12,912,904 $ 13,034,528 December 31, 2016 Commercial real estate $ 8,452 $ 1 $ 20,114 $ 28,567 $ 4,067,250 $ 4,095,817 Commercial and industrial 16,019 3 24,141 40,163 2,671,723 2,711,886 Commercial leases 973 1 3,429 4,403 192,233 196,636 Total commercial loans and leases 25,444 5 47,684 73,133 6,931,206 7,004,339 Direct installment 10,573 4,386 6,484 21,443 1,743,814 1,765,257 Residential mortgages 10,594 3,014 3,316 16,924 1,429,852 1,446,776 Indirect installment 9,312 513 1,983 11,808 1,184,302 1,196,110 Consumer lines of credit 3,529 1,112 1,616 6,257 1,093,370 1,099,627 Other 398 83 1,000 1,481 34,397 35,878 Total originated loans and leases $ 59,850 $ 9,113 $ 62,083 $ 131,046 $ 12,416,941 $ 12,547,987 (in thousands) 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, 2017 Commercial real estate $ 41,450 $ 39,243 $ 1,414 $ 82,107 $ 4,630,159 $ (206,179 ) $ 4,506,087 Commercial and industrial 7,587 7,736 2,854 18,177 977,012 (60,094 ) 935,095 Total commercial loans 49,037 46,979 4,268 100,284 5,607,171 (266,273 ) 5,441,182 Direct installment 5,669 2,183 81 7,933 196,563 1,727 206,223 Residential mortgages 19,069 14,075 — 33,144 800,460 (43,365 ) 790,239 Indirect installment — 2 — 2 75 100 177 Consumer lines of credit 11,395 5,974 747 18,116 703,422 (16,237 ) 705,301 Total acquired loans $ 85,170 $ 69,213 $ 5,096 $ 159,479 $ 7,307,691 $ (324,048 ) $ 7,143,122 December 31, 2016 Commercial real estate $ 9,501 $ 23,890 $ 949 $ 34,340 $ 1,384,752 $ (79,747 ) $ 1,339,345 Commercial and industrial 1,789 2,942 2,111 6,842 353,494 (29,441 ) 330,895 Total commercial loans 11,290 26,832 3,060 41,182 1,738,246 (109,188 ) 1,670,240 Direct installment 2,317 1,344 — 3,661 73,479 2,002 79,142 Residential mortgages 8,428 10,816 — 19,244 416,561 (38,007 ) 397,798 Indirect installment 19 4 — 23 96 84 203 Consumer lines of credit 2,156 1,528 336 4,020 201,958 (4,405 ) 201,573 Total acquired loans $ 24,210 $ 40,524 $ 3,396 $ 68,130 $ 2,430,340 $ (149,514 ) $ 2,348,956 (1) Past due information for acquired loans is based on the contractual balance outstanding at March 31, 2017 and December 31, 2016. (2) Acquired loans are considered performing upon acquisition, regardless of whether the customer is contractually delinquent, as long as we can reasonably estimate the timing and amount of expected cash flows on such loans. In these instances, we do not consider acquired contractually delinquent loans to be non-accrual non-performing non-accrual non-performing non-accrual non-performing.
Summary of Commercial Loans by Credit Quality	The following tables present a summary of our commercial loans and leases by credit quality category, segregated by loans and leases originated and loans acquired: Commercial Loan and Lease Credit Quality Categories (in thousands) Pass Special Substandard Doubtful Total Originated Loans and Leases March 31, 2017 Commercial real estate $ 4,068,403 $ 132,700 $ 60,958 $ 209 $ 4,262,270 Commercial and industrial 2,616,144 122,892 109,515 9,033 2,857,584 Commercial leases 190,641 3,711 2,719 — 197,071 Total originated commercial loans and leases $ 6,875,188 $ 259,303 $ 173,192 $ 9,242 $ 7,316,925 December 31, 2016 Commercial real estate $ 3,895,764 $ 130,452 $ 69,588 $ 13 $ 4,095,817 Commercial and industrial 2,475,955 104,652 128,089 3,190 2,711,886 Commercial leases 188,662 3,789 4,185 — 196,636 Total originated commercial loans and leases $ 6,560,381 $ 238,893 $ 201,862 $ 3,203 $ 7,004,339 Acquired Loans March 31, 2017 Commercial real estate $ 3,699,904 $ 531,316 $ 274,506 $ 361 $ 4,506,087 Commercial and industrial 786,808 77,961 70,171 155 935,095 Total acquired commercial loans $ 4,486,712 $ 609,277 $ 344,677 $ 516 $ 5,441,182 December 31, 2016 Commercial real estate $ 1,144,676 $ 85,894 $ 108,128 $ 647 $ 1,339,345 Commercial and industrial 274,819 20,593 34,967 516 330,895 Total acquired commercial loans $ 1,419,495 $ 106,487 $ 143,095 $ 1,163 $ 1,670,240
Summary of Consumer Loans by Payment Status	Following is a table showing consumer loans by payment status: Consumer Loan Credit Quality by Payment Status (in thousands) Performing Non- Performing Total Originated loans March 31, 2017 Direct installment $ 1,742,702 $ 16,193 $ 1,758,895 Residential mortgages 1,537,779 14,149 1,551,928 Indirect installment 1,258,084 1,686 1,259,770 Consumer lines of credit 1,097,781 2,914 1,100,695 Total originated consumer loans $ 5,636,346 $ 34,942 $ 5,671,288 December 31, 2016 Direct installment $ 1,750,305 $ 14,952 $ 1,765,257 Residential mortgages 1,433,409 13,367 1,446,776 Indirect installment 1,193,930 2,180 1,196,110 Consumer lines of credit 1,096,642 2,985 1,099,627 Total originated consumer loans $ 5,474,286 $ 33,484 $ 5,507,770 Acquired loans March 31, 2017 Direct installment $ 206,138 $ 85 $ 206,223 Residential mortgages 788,656 1,583 790,239 Indirect installment 177 — 177 Consumer lines of credit 703,972 1,329 705,301 Total acquired consumer loans $ 1,698,943 $ 2,997 $ 1,701,940 December 31, 2016 Direct installment $ 79,142 $ — $ 79,142 Residential mortgages 397,798 — 397,798 Indirect installment 203 — 203 Consumer lines of credit 201,061 512 201,573 Total acquired consumer loans $ 678,204 $ 512 $ 678,716
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: (in thousands) Unpaid Contractual Principal Balance Recorded Investment With No Specific Reserve Recorded Investment Specific Reserve Total Recorded Investment Specific Reserve Average Recorded Investment At or for the Three Months Ended March 31, 2017 Commercial real estate $ 27,470 $ 21,266 $ 1,795 $ 23,061 $ 209 $ 21,612 Commercial and industrial 36,889 12,055 22,299 34,354 9,038 29,065 Commercial leases 2,017 2,017 — 2,017 — 2,723 Total commercial loans and leases 66,376 35,338 24,094 59,432 9,247 53,400 Direct installment 18,062 16,193 — 16,193 — 15,572 Residential mortgages 15,151 14,149 — 14,149 — 13,758 Indirect installment 4,168 1,686 — 1,686 — 1,933 Consumer lines of credit 3,831 2,914 — 2,914 — 2,950 Other 1,000 1,000 — 1,000 — 1,000 Total $ 108,588 $ 71,280 $ 24,094 $ 95,374 $ 9,247 $ 88,613 At or for the Year Ended December 31, 2016 Commercial real estate $ 23,771 $ 19,699 $ 464 $ 20,163 $ 13 $ 19,217 Commercial and industrial 25,719 14,781 8,996 23,777 3,190 29,730 Commercial leases 3,429 3,429 — 3,429 — 3,394 Total commercial loans and leases 52,919 37,909 9,460 47,369 3,203 52,341 Direct installment 16,440 14,952 — 14,952 — 14,997 Residential mortgages 14,090 13,367 — 13,367 — 13,200 Indirect installment 5,172 2,180 — 2,180 — 2,037 Consumer lines of credit 3,858 2,985 — 2,985 — 2,813 Other 1,000 1,000 — 1,000 — 1,000 Total $ 93,479 $ 72,393 $ 9,460 $ 81,853 $ 3,203 $ 86,388
Additional Allowance for Credit Losses Relating to Acquired Loans	The above tables do not reflect the additional allowance for credit losses relating to acquired loans in the following pools and categories: (in thousands) March 31, 2017 December 31, 2016 Commercial real estate $ 3,734 $ 4,538 Commercial and industrial 127 500 Total commercial loans 3,861 5,038 Direct installment 994 1,005 Residential mortgages 795 632 Indirect installment 221 221 Consumer lines of credit 697 372 Total allowance on acquired loans $ 6,568 $ 7,268
Summary of Payment Status of TDRs	Following is a summary of the payment status of TDRs: (in thousands) Originated Acquired Total March 31, 2017 Accruing: Performing $ 17,552 $ 272 $ 17,824 Non-performing 19,659 4,329 23,988 Non-accrual 8,862 562 9,424 Total TDRs $ 46,073 $ 5,163 $ 51,236 December 31, 2016 Accruing: Performing $ 17,105 $ 365 $ 17,470 Non-performing 20,252 176 20,428 Non-accrual 9,035 — 9,035 Total TDRs $ 46,392 $ 541 $ 46,933
Reserve for Commercial TDRs Included in Allowance for Credit Losses	The reserve for commercial TDRs included in the allowance for credit losses is presented in the following table: (in thousands) March 31, 2017 December 31, Specific reserves for commercial TDRs $ 253 $ 291 Pooled reserves for individual loans under $500 234 276
Summary of Troubled Debt Restructurings by Class of Loans	The majority of TDRs are the result of interest rate concessions for a limited period of time. Following is a summary of loans, by class, that have been restructured: Three Months Ended March 31, 2017 Three Months Ended March 31, 2016 (dollars in thousands) 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 1 $ 114 $ 109 4 $ 778 $ 760 Commercial and industrial — — — 2 5,565 3,279 Total commercial loans 1 114 109 6 6,343 4,039 Direct installment 171 1,488 1,412 145 1,991 1,961 Residential mortgages 8 163 176 18 968 951 Indirect installment 5 17 14 3 11 12 Consumer lines of credit 22 742 729 20 243 238 Total 207 $ 2,524 $ 2,440 192 $ 9,556 $ 7,201
Summary of Originated Troubled Debt Restructurings by Class of Loans and Leases, Payment Default	Following is a summary of originated TDRs, by class, for which there was a payment default, excluding loans that were either charged-off Three Months Ended March 31, 2017 Three Months Ended March 31, 2016 (dollars in thousands) Number of Contracts Recorded Investment Number of Contracts Recorded Investment Commercial real estate — $ — — $ — Commercial and industrial — — — — Total commercial loans — — — — Direct installment 29 82 28 175 Residential mortgages 2 224 1 50 Indirect installment 6 10 4 5 Consumer lines of credit 1 34 1 10 Total 38 $ 350 34 $ 240

Allowance for Credit Losses (Ta

Allowance for Credit Losses (Tables)	3 Months Ended
	Mar. 31, 2017
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: (in thousands) Balance at Beginning of Charge- Recoveries Net Charge- Provision Balance at End of Three Months Ended March 31, 2017 Commercial real estate $ 46,635 $ (988 ) $ 361 $ (627 ) $ 381 $ 46,389 Commercial and industrial 47,991 (2,463 ) 474 (1,989 ) 7,568 53,570 Commercial leases 3,280 (506 ) 1 (505 ) 738 3,513 Total commercial loans and leases 97,906 (3,957 ) 836 (3,121 ) 8,687 103,472 Direct installment 21,391 (2,874 ) 628 (2,246 ) 1,065 20,210 Residential mortgages 10,082 (180 ) 161 (19 ) 147 10,210 Indirect installment 10,564 (2,370 ) 781 (1,589 ) 655 9,630 Consumer lines of credit 9,456 (458 ) 165 (293 ) (280 ) 8,883 Other 1,392 (973 ) 327 (646 ) 1,063 1,809 Total allowance on originated loans and leases 150,791 (10,812 ) 2,898 (7,914 ) 11,337 154,214 Purchased credit-impaired loans 572 — — — 88 660 Other acquired loans 6,696 (482 ) 269 (213 ) (575 ) 5,908 Total allowance on acquired loans 7,268 (482 ) 269 (213 ) (487 ) 6,568 Total allowance $ 158,059 $ (11,294 ) $ 3,167 $ (8,127 ) $ 10,850 $ 160,782 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
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 (in thousands) Individually Evaluated for Impairment Collectively Evaluated for Impairment Loans and Individually Evaluated for Impairment Collectively Evaluated for Impairment March 31, 2017 Commercial real estate $ 209 $ 46,180 $ 4,262,270 $ 14,989 $ 4,247,281 Commercial and industrial 9,038 44,532 2,857,584 32,157 2,825,427 Commercial leases — 3,513 197,071 — 197,071 Total commercial loans and leases 9,247 94,225 7,316,925 47,146 7,269,779 Direct installment — 20,210 1,758,895 — 1,758,895 Residential mortgages — 10,210 1,551,928 — 1,551,928 Indirect installment — 9,630 1,259,770 — 1,259,770 Consumer lines of credit — 8,883 1,100,695 — 1,100,695 Other — 1,809 46,315 — 46,315 Total $ 9,247 $ 144,967 $ 13,034,528 $ 47,146 $ 12,987,382 December 31, 2016 Commercial real estate $ 13 $ 46,622 $ 4,095,817 $ 12,973 $ 4,082,844 Commercial and industrial 3,190 44,801 2,711,886 21,746 2,690,140 Commercial leases — 3,280 196,636 — 196,636 Total commercial loans and leases 3,203 94,703 7,004,339 34,719 6,969,620 Direct installment — 21,391 1,765,257 — 1,765,257 Residential mortgages — 10,082 1,446,776 — 1,446,776 Indirect installment — 10,564 1,196,110 — 1,196,110 Consumer lines of credit — 9,456 1,099,627 — 1,099,627 Other — 1,392 35,878 — 35,878 Total $ 3,203 $ 147,588 $ 12,547,987 $ 34,719 $ 12,513,268

Loan Servicing (Tables)

Loan Servicing (Tables)	3 Months Ended
	Mar. 31, 2017
Summary of the Sensitivity of Fair Value of MSRs to Changes in key Assumptions	Following is a summary of the sensitivity of the fair value of MSRs to changes in key assumptions: (dollars in thousands) March 31, 2017 December 31, Weighted average life (months) 82.2 79.0 Constant prepayment rate (annualized) 9.4 % 9.9 % Discount rate 9.7 % 9.8 % Effect on fair value due to change in interest rates: + 0.25% $ 1,229 $ 692 + 0.50% 2,298 1,288 - 0.25% (1,370 ) (789 ) - 0.50% (2,839 ) (1,680 )
Mortgage Servicing Rights [Member]
Summary of Mortgage Servicing Rights Activity	Following is a summary of the MSR activity: Three Months Ended March 31, (in thousands) 2017 2016 Balance at beginning of period $ 13,521 $ 8,921 Fair value of MSRs acquired 8,553 — Additions 1,454 884 Payoffs and curtailments (139 ) (98 ) Amortization (523 ) (467 ) Balance at end of period $ 22,866 $ 9,240 Fair value, beginning of period $ 17,546 $ 11,503 Fair value, end of period 26,962 11,538
SBA-Guaranteed Loan Servicing [Member]
Summary of Mortgage Servicing Rights Activity	Following is a summary of the activity in SBA servicing assets: Three Months ended March 31, 2017 (in thousands) Balance at beginning of period $ — Fair value of servicing rights acquired 5,399 Additions — Amortization (60 ) Balance at end of period $ 5,339

Borrowings (Tables)

Borrowings (Tables)	3 Months Ended
	Mar. 31, 2017
Debt Disclosure [Abstract]
Summary of Short-Term Borrowings	Following is a summary of short-term borrowings: (in thousands) March 31, 2017 December 31, Securities sold under repurchase agreements $ 310,751 $ 313,062 Federal Home Loan Bank advances 1,960,000 1,025,000 Federal funds purchased 1,185,000 1,037,000 Subordinated notes 130,212 127,948 Total short-term borrowings $ 3,585,963 $ 2,503,010
Summary of Long-Term Borrowings	Following is a summary of long-term borrowings: (in thousands) March 31, 2017 December 31, Federal Home Loan Bank advances $ 330,098 $ 305,110 Subordinated notes 87,558 87,147 Junior subordinated debt 109,987 48,600 Other subordinated debt 168,563 98,637 Total long-term borrowings $ 696,206 $ 539,494
Junior Subordinated Debt Trusts	The following table provides information relating to the Trusts as of March 31, 2017: (dollars in thousands) Trust Preferred Securities Common Securities Junior Subordinated Debt Stated Maturity Date Interest Rate and Rate Reset Factor F.N.B. Statutory Trust II $ 21,500 $ 665 $ 22,165 6/15/36 2.78 % LIBOR + 165 basis points (bps) Omega Financial Capital Trust I 26,000 1,114 26,445 10/18/34 3.21 % LIBOR + 219 bps Yadkin Valley Statutory Trust I 25,000 774 20,677 12/15/37 2.45 % LIBOR + 132 bps FNB Financial Services Capital Trust I 25,000 774 21,635 9/30/35 2.59 % LIBOR + 146 bps American Community Capital Trust II 10,000 310 10,455 12/15/33 3.80 % LIBOR + 280 bps Crescent Financial Capital Trust I 8,000 248 8,610 10/07/33 4.12 % LIBOR + 310 bps Total $ 115,500 $ 3,885 $ 109,987

Derivative Instruments and He34

Derivative Instruments and Hedging Activities (Tables)	3 Months Ended
	Mar. 31, 2017
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 our derivative assets and derivative liabilities: March 31, 2017 December 31, 2016 Notional Fair Value Notional Fair Value (in thousands) Amount Asset Liability Amount Asset Liability Gross Derivatives Subject to master netting arrangements: Interest rate contracts – designated $ 655,000 $ 603 $ 1,494 $ 450,000 $ 9,256 $ 1,171 Interest rate swaps – not designated 1,825,706 792 13,966 1,689,157 12,720 34,046 Equity contracts – not designated 1,180 46 — 1,180 61 — Total subject to master netting arrangements 2,481,886 1,441 15,460 2,140,337 22,037 35,217 Not subject to master netting arrangements: Interest rate swaps – not designated 1,825,706 30,263 13,820 1,689,157 32,170 11,866 Interest rate lock commitments – not designated 76,087 1,252 26 — — — Forward delivery commitments – not designated 85,065 20 376 — — — Credit risk contracts – not designated 186,037 15 106 174,538 13 123 Equity contracts – not designated 1,180 — 46 1,180 — 61 Total not subject to master netting arrangements 2,174,075 31,550 14,374 1,864,875 32,183 12,050 Total $ 4,655,961 $ 32,991 $ 29,834 $ 4,005,212 $ 54,220 $ 47,267
Summary of Amounts Reclassified from Accumulated Other Comprehensive Income (AOCI)	The following table shows amounts reclassified from accumulated other comprehensive income (AOCI) for the three months ended March 31, 2017: (in thousands) Total Net of Tax Reclassified from AOCI to interest income $ 506 $ 329 Reclassified from AOCI to interest expense 148 96
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: (in thousands) Gross Amount Gross Offset in the Net Amount March 31, 2017 Derivative Assets Subject to master netting arrangements: Interest rate contracts Designated $ 603 — $ 603 Not designated 792 — 792 Equity contracts – not designated 46 — 46 Not subject to master netting arrangements: Interest rate contracts – not designated 30,263 — 30,263 Interest rate lock commitments – not designated 1,252 — 1,252 Forward delivery commitments – not designated 20 — 20 Credit risk contracts – not designated 15 — 15 Total derivative assets $ 32,991 — $ 32,991 December 31, 2016 Derivative Assets Subject to master netting arrangements: Interest rate contracts Designated $ 9,256 — $ 9,256 Not designated 12,720 — 12,720 Equity contracts – not designated 61 — 61 Not subject to master netting arrangements: Interest rate contracts – not designated 32,170 — 32,170 Credit contracts – not designated 13 — 13 Total derivative assets $ 54,220 — $ 54,220
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: (in thousands) Gross Amount Gross Offset in the Net Amount March 31, 2017 Derivative Liabilities Subject to master netting arrangements: Interest rate contracts Designated $ 1,494 — $ 1,494 Not designated 13,966 — 13,966 Not subject to master netting arrangements: Interest rate contracts – not designated 13,820 — 13,820 Interest rate lock commitments – not designated 26 — 26 Forward delivery commitments – not designated 376 — 376 Credit risk contracts – not designated 106 — 106 Equity contracts – not designated 46 — 46 Total derivative liabilities $ 29,834 — $ 29,834 Gross Amount Gross Amounts Offset in the Sheet Net Amount Presented in the Balance December 31, 2016 Derivative Liabilities Subject to master netting arrangements: Interest rate contracts Designated $ 1,171 — $ 1,171 Not designated 34,046 — 34,046 Not subject to master netting arrangements: Interest rate contracts – not designated 11,866 — 11,866 Credit contracts – not designated 123 — 123 Equity contracts – not designated 61 — 61 Total derivative liabilities $ 47,267 — $ 47,267
Effect of Derivative Financial Instruments on Income Statement	The following table presents the effect of certain derivative financial instruments on the income statement: Three Months Ended March 31, (in thousands) Income Statement Location 2017 2016 Interest Rate Contracts Interest income - loans and leases $ 506 $ 687 Interest Rate Contracts Interest expense – short-term borrowings 148 150 Interest Rate Swaps Other income (219 ) (41 ) Credit Risk Contracts Other income 19 (71 )
Interest Rate Contracts [Member]
Summary of Key Data Related to Interest Rate	Following is a summary of key data related to interest rate contracts: (in thousands) March 31, 2017 December 31, Notional amount $ 655,000 $ 450,000 Fair value included in other assets 603 9,256 Fair value included in other liabilities 1,494 1,171
Interest Rate Swap [Member]
Summary of Key Data Related to Interest Rate	Following is a summary of key data related to interest rate swaps: (in thousands) March 31, 2017 December 31, Notional amount $ 3,651,412 $ 3,378,314 Fair value included in other assets 31,055 44,890 Fair value included in other liabilities 27,786 45,912
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 sheets to the net amounts that would result in the event of offset: Amount Not Offset in the (in thousands) Net Amount the Balance Sheet Financial Cash Net Amount March 31, 2017 Derivative Assets Interest rate contracts: Designated $ 603 $ 603 — $ — Not designated 792 680 — 112 Equity contracts – not designated 46 46 — — Total $ 1,441 $ 1,329 — $ 112 December 31, 2016 Derivative Assets Interest rate contracts: Designated $ 9,256 $ 843 $ 8,413 $ — Not designated 12,720 474 12,132 114 Equity contracts – not designated 61 61 — — Total $ 22,037 $ 1,378 $ 20,545 $ 114
Derivative Liabilities	The following table presents a reconciliation of the net amounts of derivative assets and derivative liabilities presented in the balance sheets to the net amounts that would result in the event of offset: Amount Not Offset in the (in thousands) Net Amount the Balance Sheet Financial Cash Net Amount March 31, 2017 Derivative Liabilities Interest rate contracts: Designated $ 1,494 $ 1,494 — $ — Not designated 13,966 13,208 — 758 Total $ 15,460 $ 14,702 — $ 758 December 31, 2016 Derivative Liabilities Interest rate contracts: Designated $ 1,171 $ 1,171 $ — $ — Not designated 34,046 15,490 17,651 905 Total $ 35,217 $ 16,661 $ 17,651 $ 905

Commitments, Credit Risk and 35

Commitments, Credit Risk and Contingencies (Tables)	3 Months Ended
	Mar. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Summary of Off-Balance Sheet Credit Risk Information	Following is a summary of off-balance (in thousands) March 31, 2017 December 31, 2016 Commitments to extend credit $ 6,278,542 $ 4,424,834 Standby letters of credit 135,120 117,732

Stock Incentive Plans (Tables)

Stock Incentive Plans (Tables)	3 Months Ended
	Mar. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Summary of Activity Relating to Restricted Stock Awards	The following table summarizes the activity relating to restricted stock awards during the periods indicated: Three Months Ended March 31, 2017 2016 Awards Weighted Average Grant Awards Weighted Average Grant Unvested awards outstanding at beginning of period 1,836,363 $ 12.97 1,548,444 $ 12.85 Vested (243,982 ) 11.83 (363,799 ) 12.07 Forfeited (2,950 ) 13.00 (6,368 ) 12.79 Dividend reinvestment 12,253 14.54 10,870 11.50 Unvested awards outstanding at end of period 1,601,684 13.16 1,189,147 13.08
Schedule of Certain Information Related to Restricted Stock Awards	The following table provides certain information related to restricted stock awards: (in thousands) Three Months Ended March 31, 2017 2016 Stock-based compensation expense $ 1,760 $ 1,136 Tax benefit related to stock-based compensation expense 616 398 Fair value of awards vested 3,802 4,424
Components of Restricted Stock Awards	The components of the restricted stock awards as of March 31, 2017 are as follows: (dollars in thousands) Service- Awards Performance- Based Awards Total Unvested restricted stock awards 830,140 771,544 1,601,684 Unrecognized compensation expense $ 3,784 $ 4,494 $ 8,278 Intrinsic value $ 12,344 $ 11,473 $ 23,817 Weighted average remaining life (in years) 1.72 1.77 1.75
Summary of Activity Relating to Stock Options Awards	The following table summarizes the activity relating to stock options during the periods indicated: Three Months Ended March 31, 2017 2016 Shares Weighted Average Exercise Price Shares Weighted Average Exercise Price Options outstanding at beginning of period 892,532 $ 8.95 435,340 $ 8.86 Assumed from acquisitions 207,645 8.92 1,707,036 7.83 Exercised (131,792 ) 9.44 (24,806 ) 6.38 Forfeited (49,281 ) 10.91 (92,650 ) 6.69 Options outstanding and exercisable at end of period 919,104 8.77 2,024,920 8.12

Retirement Plans (Tables)

Retirement Plans (Tables)	3 Months Ended
	Mar. 31, 2017
Compensation and Retirement Disclosure [Abstract]
Schedule of Contribution Expense	Our contribution expense is presented in the following table: Three Months Ended March 31, (in thousands) 2017 2016 401(k) contribution expense $ 2,767 $ 2,462
Net Periodic Benefit Credit for Defined Benefit Plans	The net periodic benefit credit for these plans includes the following components: Three Months Ended March 31, (in thousands) 2017 2016 Service cost $ (4 ) $ (4 ) Interest cost 1,477 1,544 Expected return on plan assets (2,427 ) (2,353 ) Amortization: Unrecognized prior service cost 2 2 Unrecognized loss 628 608 Net periodic pension credit $ (324 ) $ (203 )

Other Comprehensive Income (Tab

Other Comprehensive Income (Tables)	3 Months Ended
	Mar. 31, 2017
Equity [Abstract]
Changes in AOCI, Net of Tax, by Component	The following table presents changes in AOCI, net of tax, by component: (in thousands) Unrealized Net Gains (Losses) on Securities Available for Sale Unrealized Net Gains Derivative Instruments Unrecognized Postretirement Obligations Total Three Months Ended March 31, 2017 Balance at beginning of period $ (18,222 ) $ 5,254 $ (48,401 ) $ (61,369 ) Other comprehensive income before reclassifications 6,032 (1,022 ) 410 5,420 Amounts reclassified from AOCI (787 ) (233 ) — (1,020 ) Net current period other comprehensive income 5,245 (1,255 ) 410 4,400 Balance at end of period $ (12,977 ) $ 3,999 $ (47,991 ) $ (56,969 )

Earnings per Common Share (Tabl

Earnings per Common Share (Tables)	3 Months Ended
	Mar. 31, 2017
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, ( 2017 2016 Net income $ 22,979 $ 26,132 Less: Preferred stock dividends 2,010 2,010 Net income available to common stockholders $ 20,969 $ 24,122 Basic weighted average common shares outstanding 237,379,260 193,585,702 Net effect of dilutive stock options, warrants and restricted stock 1,875,389 1,292,220 Diluted weighted average common shares outstanding 239,254,649 194,877,922 Earnings per common share: Basic $ 0.09 $ 0.12 Diluted $ 0.09 $ 0.12
Schedule of Average Shares Excluded from Diluted Earnings Per Common Share Calculation	The following table shows the average shares excluded from the above calculation as their effect would have been anti-dilutive: Three Months Ended March 31, 2017 2016 Average shares excluded from the diluted earnings per common share calculation 81,755 15,501

Cash Flow Information (Tables)

Cash Flow Information (Tables)	3 Months Ended
	Mar. 31, 2017
Supplemental Cash Flow Elements [Abstract]
Summary of Supplemental Cash Flow Information	Following is a summary of supplemental cash flow information: Three Months Ended March 31, 2017 2016 (in thousands) Interest paid on deposits and other borrowings $ 18,606 $ 13,794 Income taxes paid — — Transfers of loans to other real estate owned 20,517 8,049 Financing of other real estate owned sold — 62

Business Segments (Tables)

Business Segments (Tables)	3 Months Ended
	Mar. 31, 2017
Segment Reporting [Abstract]
Financial Information for Segments of FNB	The following tables provide financial information for these segments of FNB. The information provided under the caption “Parent and Other” represents operations not considered to be reportable segments and/or general operating expenses of FNB, and includes the parent company, other non-bank (in thousands) Community Wealth Management Insurance Consumer Parent and Consolidated At or for the Three Months Ended March 31, 2017 Interest income $ 182,358 $ — $ 20 $ 9,902 $ 2,413 $ 194,693 Interest expense 18,865 — — 922 2,154 21,941 Net interest income 163,493 — 20 8,980 259 172,752 Provision for credit losses 8,198 — — 1,786 866 10,850 Non-interest 41,384 9,549 4,325 710 (852 ) 55,116 Non-interest 167,393 7,540 3,315 5,231 978 184,457 Amortization of intangibles 2,982 61 55 — — 3,098 Income tax expense (benefit) 6,148 711 347 1,067 (1,789 ) 6,484 Net income (loss) 20,156 1,237 628 1,606 (648 ) 22,979 Total assets 30,007,404 22,130 20,514 184,006 (43,359 ) 30,190,695 Total intangibles 2,360,557 10,353 12,285 1,809 — 2,385,004 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 31,233 8,816 4,194 716 1,085 46,044 Non-interest 118,048 7,089 3,301 5,204 357 133,999 Amortization of intangibles 2,441 65 143 — — 2,649 Income tax expense (benefit) 10,117 605 275 1,112 (259 ) 11,850 Net income 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 (1) Excludes amortization of intangibles, which is presented separately.

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2017
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: (in thousands) Level 1 Level 2 Level 3 Total March 31, 2017 Assets Measured at Fair Value Debt securities available for sale: U.S. Treasury $ — $ 29,945 $ — $ 29,945 U.S. government-sponsored entities — 395,206 — 395,206 Residential mortgage-backed securities: Agency mortgage-backed securities — 1,643,014 — 1,643,014 Agency collateralized mortgage obligations — 503,963 — 503,963 Non-agency — 2 — 2 Commercial mortgage-backed securities — 419 — 419 States of the U.S. and political subdivisions — 34,678 — 34,678 Other debt securities — 9,547 12,047 21,594 Total debt securities available for sale — 2,616,774 12,047 2,628,821 Equity securities available for sale: Fixed income mutual fund 3,723 5,353 — 9,076 Financial services industry — 760 — 760 Insurance services industry 158 — — 158 Total equity securities available for sale 3,881 6,113 — 9,994 Total securities available for sale 3,881 2,622,887 12,047 2,638,815 Loans held for sale — 11,121 — 11,121 Derivative financial instruments: Trading — 31,101 — 31,101 Not for trading — 638 1,252 1,890 Total derivative financial instruments — 31,739 1,252 32,991 Total assets measured at fair value on a recurring basis $ 3,881 $ 2,665,747 $ 13,299 $ 2,682,927 Liabilities Measured at Fair Value Derivative financial instruments: Trading — $ 27,832 — $ 27,832 Not for trading — 2,002 — 2,002 Total derivative financial instruments — 29,834 — 29,834 Total liabilities measured at fair value on a recurring basis — $ 29,834 — $ 29,834 (in thousands) Level 1 Level 2 Level 3 Total December 31, 2016 Assets Measured at Fair Value Debt securities available for sale: U.S. Treasury $ — $ 29,953 $ — $ 29,953 U.S. government-sponsored entities — 365,098 — 365,098 Residential mortgage-backed securities: Agency mortgage-backed securities — 1,252,798 — 1,252,798 Agency collateralized mortgage obligations — 535,974 — 535,974 Non-agency — 3 894 897 Commercial mortgage-backed securities — 1,291 — 1,291 States of the U.S. and political subdivisions — 35,849 — 35,849 Other debt securities — 9,487 — 9,487 Total debt securities available for sale — 2,230,453 894 2,231,347 Equity securities available for sale: Financial services industry — — 492 492 Insurance services industry 148 — — 148 Total equity securities available for sale 148 — 492 640 Total securities available for sale 148 2,230,453 1,386 2,231,987 Derivative financial instruments: Trading — 44,951 — 44,951 Not for trading — 9,269 — 9,269 Total derivative financial instruments — 54,220 — 54,220 Total assets measured at fair value on a recurring basis $ 148 $ 2,284,673 $ 1,386 $ 2,286,207 Liabilities Measured at Fair Value Derivative financial instruments: Trading — $ 45,973 — $ 45,973 Not for trading — 1,294 — 1,294 Total derivative financial instruments — 47,267 — 47,267 Total liabilities measured at fair value on a recurring basis — $ 47,267 — $ 47,267
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 we have utilized Level 3 inputs to determine fair value: (in thousands) Other Debt Securities Equity Residential Non-Agency Collateralized Mortgage Obligations Interest Rate Lock Commitments Total Three Months Ended March 31, 2017 Balance at beginning of period $ — $ 492 $ 894 $ — $ 1,386 Total gains (losses) – realized/unrealized: Included in earnings — — 4 — 4 Included in other comprehensive income — 86 (6 ) — 80 Accretion included in earnings (1 ) — 1 — — Purchases, issuances, sales and settlements: Purchases 12,048 — — — 12,048 Issuances — — — — — Sales/redemptions — — (874 ) — (874 ) Settlements — — (19 ) — (19 ) Transfers from Level 3 — (578 ) — — (578 ) Transfers into Level 3 — — — 1,252 1,252 Balance at end of period $ 12,047 $ — $ — $ 1,252 $ 13,299 Year Ended December 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 — 53 (7 ) — 46 Accretion included in earnings — — 6 — 6 Purchases, issuances, sales and settlements: Purchases — — — — — Issuances — — — — — Sales/redemptions — — — — — Settlements — — (289 ) — (289 ) Transfers from Level 3 — — — — — Transfers into Level 3 — — — — — Balance at end of period $ — $ 492 $ 894 $ — $ 1,386
Additional Information about Assets Measured at Fair Value on Non-Recurring Basis	For assets measured at fair value on a non-recurring (in thousands) Level 1 Level 2 Level 3 Total March 31, 2017 Impaired loans — $ 1,812 $ 6,953 $ 8,765 Other real estate owned — 643 1,199 1,842 December 31, 2016 Impaired loans — $ 500 $ 5,883 $ 6,383 Other real estate owned — 11,017 3,181 14,198
Fair Values of Financial Instruments	The fair values of our financial instruments are as follows: Fair Value Measurements (in thousands) Carrying Fair Value Level 1 Level 2 Level 3 March 31, 2017 Financial Assets Cash and cash equivalents $ 450,383 $ 450,383 $ 450,383 $ — $ — Securities available for sale 2,638,815 2,638,815 3,881 2,622,887 12,047 Securities held to maturity 2,922,152 2,886,897 — 2,886,897 — Net loans and leases (1) 20,092,138 19,823,712 — 11,121 19,812,591 Loan servicing rights 28,205 32,301 — — 32,301 Derivative assets 32,991 32,991 — 31,739 1,252 Accrued interest receivable 77,638 77,638 77,638 — — Financial Liabilities Deposits 21,326,272 21,298,707 17,446,603 3,852,104 — Short-term borrowings 3,585,963 3,586,486 3,586,486 — — Long-term borrowings 696,206 688,209 — — 688,209 Derivative liabilities 29,834 29,834 — 29,834 — Accrued interest payable 10,947 10,947 10,947 — — December 31, 2016 Financial Assets Cash and cash equivalents $ 371,407 $ 371,407 $ 371,407 $ — $ — Securities available for sale 2,231,987 2,231,987 148 2,230,453 1,386 Securities held to maturity 2,337,342 2,294,777 — 2,293,091 1,686 Net loans and leases (1) 14,750,792 14,446,274 — — 14,464,274 Loan servicing rights 13,521 17,546 — — 17,546 Derivative assets 54,220 54,220 — 54,220 — Accrued interest receivable 58,712 58,712 58,712 — — Financial Liabilities Deposits 16,065,647 16,045,323 13,489,152 2,556,171 — Short-term borrowings 2,503,010 2,503,277 2,503,277 — — Long-term borrowings 539,494 536,088 — — 536,088 Derivative liabilities 47,267 47,267 — 47,267 — Accrued interest payable 7,612 7,612 7,612 — — (1) Includes loans held for sale.

Nature of Operations (Additiona

Nature of Operations (Additional Information) (Detail)	3 Months Ended
	Mar. 31, 2017StateOffice
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of states, Company operating financial services | State	8
Number of consumer finance offices	76
Number of banking offices	422

Summary of Significant Accoun44

Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Summary Of Significant Accounting Policies [Line Items]
Core deposit intangibles amortization period, years	10 years
Net investment in LIHTCs	$ 14.7	$ 14
Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Useful life of the asset, years	3 years
Estimated useful life of intangibles, years	8 years
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Useful life of the asset, years	40 years
Estimated useful life of intangibles, years	13 years

New Accounting Standards - Addi

New Accounting Standards - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2017
Accounting Policies [Abstract]
Percentage of out-of-scope interest income and non-interest income	80.00%

Mergers and Acquisitions - Addi

Mergers and Acquisitions - Additional Information (Detail) $ / shares in Units, $ in Thousands		Mar. 11, 2017USD ($)$ / sharesshares	Apr. 22, 2016USD ($)Branch	Feb. 13, 2016USD ($)shares		Mar. 31, 2017USD ($)$ / shares	Mar. 31, 2016USD ($)	Dec. 31, 2016USD ($)
Business Acquisition [Line Items]
Goodwill recorded as a result of merger						$ 2,250,305		$ 1,032,129
Merger-related expenses						$ 52,724	$ 24,940
Warrant Expires in 2019 [Member]
Business Acquisition [Line Items]
Warrant issued, exercise price | $ / shares						$ 11.52
Yadkin Financial Corporation (YDKN) [Member]
Business Acquisition [Line Items]
Assets acquired as a result of merger		$ 6,785,120
Loans acquired as a result of merger		5,116,497
Deposits acquired as a result of merger		5,176,758
Value of acquisition		$ 1,783,366
Closing price of common stock | $ / shares		$ 15.97
Common shares issued | shares		111,619,975
Common shares to be acquired, shares | shares		51,677,565
Number of shares entitled to receive as per merger agreement, Ratio		2.16
Goodwill recorded as a result of merger	[1]	$ 1,218,041
Merger-related expenses						$ 52,300
Issuance costs incurred in connection with acquisition						$ 500
Contract termination cost						30.80%
Cash acquired as a result of merger		$ 197,682
Yadkin Financial Corporation (YDKN) [Member] | Warrant Expires in 2019 [Member]
Business Acquisition [Line Items]
Warrant issued | shares		207,320
Warrant issued, exercise price | $ / shares		$ 9.63
Yadkin Financial Corporation (YDKN) [Member] | Merger - Related Expenses [Member]
Business Acquisition [Line Items]
Severance costs						26.60%
Fifth Third Bank Branches [Member]
Business Acquisition [Line Items]
Assets acquired as a result of merger			$ 312,424
Loans acquired as a result of merger			95,354
Deposits acquired as a result of merger			302,529
Goodwill recorded as a result of merger	[1]		14,146
Core deposit intangibles recorded as result of the acquisition			$ 4,100
Number of branch-banking locations acquired | Branch			17
Cash acquired as a result of merger			$ 198,872
Fixed and other assets acquired as a result of merger			$ 14,100
Percentage of deposit premium paid			1.97%
Metro Bancorp Inc [Member]
Business Acquisition [Line Items]
Assets acquired as a result of merger				$ 2,783,665
Loans acquired as a result of merger				1,862,447
Deposits acquired as a result of merger				2,328,238
Value of acquisition				$ 404,242
Common shares issued | shares				34,041,181
Goodwill recorded as a result of merger		$ 1,200,000		$ 185,054	[1]
Core deposit intangibles recorded as result of the acquisition		$ 55,700		24,200
Merger-related expenses						$ 400		$ 31,000
Issuance costs incurred in connection with acquisition						$ 700
Cash acquired as a result of merger				$ 46,890
Common shares acquired | shares				14,345,319
Metro Bancorp Inc [Member] | Merger - Related Expenses [Member]
Business Acquisition [Line Items]
Severance costs						39.90%
[1]	All of the goodwill for these transactions has been recorded in the Community Banking Segment.

Mergers and Acquisitions - Busi

Mergers and Acquisitions - Business Acquisition Pro Forma Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Business Acquisition Pro Forma Information [Line Items]
Revenue (net interest income and non-interest income)	$ 280,762	$ 259,784
Net income	71,978	39,613
Net income available to common stockholders	$ 69,968	$ 37,603
Earnings per common share - basic	$ 0.22	$ 0.12
Earnings per common share - diluted	$ 0.22	$ 0.12
F.N.B. Corporation [Member]
Business Acquisition Pro Forma Information [Line Items]
Revenue (net interest income and non-interest income)	$ 206,969	$ 186,398
Net income	51,253	26,132
Net income available to common stockholders	$ 49,243	$ 24,122
Earnings per common share - basic	$ 0.23	$ 0.12
Earnings per common share - diluted	$ 0.23	$ 0.12
Yadkin Financial Corporation (YDKN) [Member]
Business Acquisition Pro Forma Information [Line Items]
Revenue (net interest income and non-interest income)	$ 74,574	$ 74,709
Net income	22,435	15,447
Net income available to common stockholders	$ 22,435	$ 15,447
Earnings per common share - basic	$ 0.43	$ 0.30
Earnings per common share - diluted	$ 0.43	$ 0.30
Proforma Adjustments [Member]
Business Acquisition Pro Forma Information [Line Items]
Revenue (net interest income and non-interest income)	$ (781)	$ (1,323)
Net income	(1,710)	(1,966)
Net income available to common stockholders	$ (1,710)	$ (1,966)

Mergers and Acquisitions - Amou

Mergers and Acquisitions - Amounts Recorded on Consolidated Balance Sheets in Conjunction with Acquisition (Detail) - USD ($) $ in Thousands		Mar. 11, 2017	Feb. 13, 2016		Mar. 31, 2017	Dec. 31, 2016	Apr. 22, 2016
Business Acquisition [Line Items]
Goodwill recognized					$ 2,250,305	$ 1,032,129
Yadkin Financial Corporation (YDKN) [Member]
Business Acquisition [Line Items]
Fair value of consideration paid		$ 1,783,366
Cash and cash equivalents		197,682
Securities		940,634
Loans		5,116,497
Core deposit and other intangible assets		69,555
Fixed and other assets		460,752
Total identifiable assets acquired		6,785,120
Deposits		5,176,758
Borrowings		969,385
Other liabilities		73,652
Total liabilities assumed		6,219,795
Fair value of net identifiable assets acquired		565,325
Goodwill recognized	[1]	1,218,041
Fifth Third Bank Branches [Member]
Business Acquisition [Line Items]
Cash and cash equivalents							$ 198,872
Loans							95,354
Core deposit and other intangible assets							4,129
Fixed and other assets							14,069
Total identifiable assets acquired							312,424
Deposits							302,529
Other liabilities							24,041
Total liabilities assumed							326,570
Fair value of net identifiable assets acquired							(14,146)
Goodwill recognized	[1]						$ 14,146
Metro Bancorp Inc [Member]
Business Acquisition [Line Items]
Fair value of consideration paid			$ 404,242
Cash and cash equivalents			46,890
Securities			722,980
Loans			1,862,447
Core deposit and other intangible assets			24,163
Fixed and other assets			127,185
Total identifiable assets acquired			2,783,665
Deposits			2,328,238
Borrowings			227,539
Other liabilities			8,700
Total liabilities assumed			2,564,477
Fair value of net identifiable assets acquired			219,188
Goodwill recognized		$ 1,200,000	$ 185,054	[1]
[1]	All of the goodwill for these transactions has been recorded in the Community Banking Segment.

Securities - Schedule of Amorti

Securities - Schedule of Amortized Cost and Fair Value of Securities Available for Sale (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Securities Available For Sale, Amortized Cost	$ 2,659,080	$ 2,260,021
Securities Available For Sale, Gross Unrealized Gains	4,833	4,172
Securities Available For Sale, Gross Unrealized Losses	(25,098)	(32,206)
Securities Available For Sale, Fair Value	2,638,815	2,231,987
U.S. Treasury [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available For Sale, Amortized Cost	29,908	29,874
Securities Available For Sale, Gross Unrealized Gains	37	79
Securities Available For Sale, Fair Value	29,945	29,953
U.S. Government-Sponsored Entities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available For Sale, Amortized Cost	397,634	367,604
Securities Available For Sale, Gross Unrealized Gains	676	864
Securities Available For Sale, Gross Unrealized Losses	(3,104)	(3,370)
Securities Available For Sale, Fair Value	395,206	365,098
Agency Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available For Sale, Amortized Cost	1,650,743	1,267,535
Securities Available For Sale, Gross Unrealized Gains	3,024	2,257
Securities Available For Sale, Gross Unrealized Losses	(10,753)	(16,994)
Securities Available For Sale, Fair Value	1,643,014	1,252,798
Securities Available For Sale, Fair Value	1,643,014
Agency Collateralized Mortgage Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available For Sale, Amortized Cost	514,232	546,659
Securities Available For Sale, Gross Unrealized Gains	347	419
Securities Available For Sale, Gross Unrealized Losses	(10,616)	(11,104)
Securities Available For Sale, Fair Value	503,963	535,974
Securities Available For Sale, Fair Value	503,963
Non-Agency Collateralized Mortgage Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available For Sale, Amortized Cost	2	891
Securities Available For Sale, Gross Unrealized Gains		6
Securities Available For Sale, Fair Value	2	897
Securities Available For Sale, Fair Value	2
Commercial Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available For Sale, Amortized Cost	420	1,292
Securities Available For Sale, Gross Unrealized Losses	(1)	(1)
Securities Available For Sale, Fair Value	419	1,291
Securities Available For Sale, Fair Value	419
States of the U.S. and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available For Sale, Amortized Cost	34,763	36,065
Securities Available For Sale, Gross Unrealized Gains	69	86
Securities Available For Sale, Gross Unrealized Losses	(154)	(302)
Securities Available For Sale, Fair Value	34,678	35,849
Other Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available For Sale, Amortized Cost	21,899	9,828
Securities Available For Sale, Gross Unrealized Gains	68	94
Securities Available For Sale, Gross Unrealized Losses	(373)	(435)
Securities Available For Sale, Fair Value	21,594	9,487
Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available For Sale, Amortized Cost	2,649,601	2,259,748
Securities Available For Sale, Gross Unrealized Gains	4,221	3,805
Securities Available For Sale, Gross Unrealized Losses	(25,001)	(32,206)
Securities Available For Sale, Fair Value	2,628,821	2,231,347
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Available For Sale, Amortized Cost	9,479	273
Securities Available For Sale, Gross Unrealized Gains	612	367
Securities Available For Sale, Gross Unrealized Losses	(97)
Securities Available For Sale, Fair Value	9,994	$ 640
Securities Available For Sale, Fair Value	$ 9,994

Securities - Schedule of Amor50

Securities - Schedule of Amortized Cost and Fair Value of Securities Held to Maturity (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Investment Securities Held To Maturity [Line Items]
Securities Held To Maturity, Amortized Cost	$ 2,922,152	$ 2,337,342
Securities Held To Maturity, Gross Unrealized Gains	11,951	8,226
Securities Held To Maturity, Gross Unrealized Losses	(47,206)	(50,791)
Securities held to maturity, fair value	2,886,897	2,294,777
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	139	137
Securities held to maturity, fair value	639	637
U.S. Government-Sponsored Entities [Member]
Investment Securities Held To Maturity [Line Items]
Securities Held To Maturity, Amortized Cost	247,580	272,645
Securities Held To Maturity, Gross Unrealized Gains	395	348
Securities Held To Maturity, Gross Unrealized Losses	(4,255)	(4,475)
Securities held to maturity, fair value	243,720	268,518
Agency Mortgage-Backed Securities [Member]
Investment Securities Held To Maturity [Line Items]
Securities Held To Maturity, Amortized Cost	1,243,947	852,215
Securities Held To Maturity, Gross Unrealized Gains	7,382	5,654
Securities Held To Maturity, Gross Unrealized Losses	(6,795)	(8,645)
Securities held to maturity, fair value	1,244,534	849,224
Agency Collateralized Mortgage Obligations [Member]
Investment Securities Held To Maturity [Line Items]
Securities Held To Maturity, Amortized Cost	798,506	743,148
Securities Held To Maturity, Gross Unrealized Gains	841	447
Securities Held To Maturity, Gross Unrealized Losses	(17,003)	(17,801)
Securities held to maturity, fair value	782,344	725,794
Non-Agency Collateralized Mortgage Obligations [Member]
Investment Securities Held To Maturity [Line Items]
Securities Held To Maturity, Amortized Cost		1,689
Securities Held To Maturity, Gross Unrealized Gains		3
Securities Held To Maturity, Gross Unrealized Losses		(6)
Securities held to maturity, fair value		1,686
Commercial Mortgage-Backed Securities [Member]
Investment Securities Held To Maturity [Line Items]
Securities Held To Maturity, Amortized Cost	81,750	49,797
Securities Held To Maturity, Gross Unrealized Gains	508	181
Securities Held To Maturity, Gross Unrealized Losses	(302)	(226)
Securities held to maturity, fair value	81,956	49,752
States of the U.S. and Political Subdivisions [Member]
Investment Securities Held To Maturity [Line Items]
Securities Held To Maturity, Amortized Cost	549,869	417,348
Securities Held To Maturity, Gross Unrealized Gains	2,686	1,456
Securities Held To Maturity, Gross Unrealized Losses	(18,851)	(19,638)
Securities held to maturity, fair value	$ 533,704	$ 399,166

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, 2017	Mar. 31, 2016
Investments, Debt and Equity Securities [Abstract]
Gross gains	$ 3,400	$ 71
Gross losses	(775)
Net gains	$ 2,625	$ 71

Securities - Amortized Cost and

Securities - Amortized Cost and Fair Value of Securities, by Contractual Maturities (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Schedule Of Securities [Line Items]
Available for Sale, Due in one year or less, Amortized Cost	$ 119,899
Available for Sale, Due from one to five years, Amortized Cost	330,197
Available for Sale, Due from five to ten years, Amortized Cost	31,143
Available for Sale, Due after ten years, Amortized Cost	2,965
Available for Sale, with contractual maturities, Amortized Cost	484,204
Total securities available for sale, Amortized Cost	2,659,080	$ 2,260,021
Available for Sale, Due in one year or less, Fair Value	120,041
Available for Sale, Due from one to five years, Fair Value	327,741
Available for Sale, Due from five to ten years, Fair Value	30,918
Available for Sale, Due after ten years, Fair Value	2,723
Available for Sale, with contractual maturities, Fair Value	481,423
Total securities available for sale, Fair Value	2,638,815	2,231,987
Held to Maturity, Due in one year or less, Amortized Cost	390
Held to Maturity, Due from one to five years, Amortized Cost	253,707
Held to Maturity, Due from five to ten years, Amortized Cost	68,397
Held to Maturity, Due after ten years, Amortized Cost	475,455
Securities Held To Maturity, with contractual maturities, Amortized Cost	797,949
Held to Maturity, with contractual maturities, Amortized Cost	2,922,152	2,337,342
Held to Maturity, Due in one year or less, Fair Value	396
Held to Maturity, Due from one to five years, Fair Value	249,830
Held to Maturity, Due from five to ten years, Fair Value	68,666
Held to Maturity, Due after ten years, Fair Value	459,171
Securities Held To Maturity, with contractual maturities, Fair Value	778,063
Held to Maturity, with contractual maturities, Fair Value	2,886,897	2,294,777
Agency Mortgage-Backed Securities [Member]
Schedule Of Securities [Line Items]
Total securities available for sale, Amortized Cost	1,650,743	1,267,535
Total securities available for sale, Fair Value	1,643,014
Held to Maturity, with contractual maturities, Amortized Cost	1,243,947	852,215
Held to Maturity, with contractual maturities, Fair Value	1,244,534	849,224
Agency Collateralized Mortgage Obligations [Member]
Schedule Of Securities [Line Items]
Total securities available for sale, Amortized Cost	514,232	546,659
Total securities available for sale, Fair Value	503,963
Held to Maturity, with contractual maturities, Amortized Cost	798,506	743,148
Held to Maturity, with contractual maturities, Fair Value	782,344	725,794
Non-Agency Collateralized Mortgage Obligations [Member]
Schedule Of Securities [Line Items]
Total securities available for sale, Amortized Cost	2	891
Total securities available for sale, Fair Value	2
Held to Maturity, with contractual maturities, Amortized Cost		1,689
Held to Maturity, with contractual maturities, Fair Value		1,686
Commercial Mortgage-Backed Securities [Member]
Schedule Of Securities [Line Items]
Total securities available for sale, Amortized Cost	420	1,292
Total securities available for sale, Fair Value	419
Held to Maturity, with contractual maturities, Amortized Cost	81,750	49,797
Held to Maturity, with contractual maturities, Fair Value	81,956	49,752
Equity Securities [Member]
Schedule Of Securities [Line Items]
Total securities available for sale, Amortized Cost	9,479	$ 273
Total securities available for sale, Fair Value	$ 9,994

Securities - Schedule of Securi

Securities - Schedule of Securities Pledged as Collateral (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Financial Instruments Owned and Pledged as Collateral [Abstract]
Securities pledged (carrying value), Collateral for public deposits, trust deposits and for other purposes as required by law	$ 3,145,072	$ 2,779,335
Securities pledged (carrying value), Collateral for short-term borrowings	$ 323,658	$ 322,038
Securities pledged as a percent of total securities	62.40%	67.90%

Securities - Summaries of Fair

Securities - Summaries of Fair Values and Unrealized Losses of Impaired Securities, Segregated by Length of Impairment (Detail) $ in Thousands	Mar. 31, 2017USD ($)Security	Dec. 31, 2016USD ($)Security
Schedule Of Securities [Line Items]
Number of available for sale securities, Less than 1 year | Security	115	113
Number of available for sale securities, Greater than 1 year | Security	17	12
Number of available for sale securities | Security	132	125
Securities Available For Sale, Less than 12 Months, Fair Value	$ 1,806,324	$ 1,644,951
Securities Available For Sale, Less than 12 Months, Unrealized Losses	(21,017)	(27,928)
Securities Available For Sale, 12 Months or More, Fair Value	95,237	93,510
Securities Available For Sale, 12 Months or More, Unrealized Losses	(4,081)	(4,278)
Securities Available For Sale, Fair Value, Total	1,901,561	1,738,461
Securities Available For Sale, Unrealized Losses, Total	$ (25,098)	$ (32,206)
Number of held to maturity securities | Security	197	186
Securities Held To Maturity, Less than 12 Months, Fair Value	$ 1,689,634	$ 1,513,912
Securities Held To Maturity, Less than 12 Months, Unrealized Losses	(43,204)	(46,484)
Securities Held To Maturity, Greater than 12 Months, Fair Value	115,230	120,957
Securities Held To Maturity, Greater than 12 Months, Unrealized Losses	(4,002)	(4,307)
Securities Held To Maturity, Fair Value, Total	1,804,864	1,634,869
Securities Held To Maturity, Unrealized Losses, Total	$ (47,206)	$ (50,791)
Less than 12 Months [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities | Security	184	173
Greater than 12 Months [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities | Security	13	13
U.S. Government-Sponsored Entities [Member]
Schedule Of Securities [Line Items]
Number of available for sale securities, Less than 1 year | Security	13	11
Number of available for sale securities | Security	13	11
Securities Available For Sale, Less than 12 Months, Fair Value	$ 246,881	$ 211,636
Securities Available For Sale, Less than 12 Months, Unrealized Losses	(3,104)	(3,370)
Securities Available For Sale, Fair Value, Total	246,881	211,636
Securities Available For Sale, Unrealized Losses, Total	$ (3,104)	$ (3,370)
Number of held to maturity securities | Security	11	10
Securities Held To Maturity, Less than 12 Months, Fair Value	$ 200,745	$ 185,525
Securities Held To Maturity, Less than 12 Months, Unrealized Losses	(4,255)	(4,475)
Securities Held To Maturity, Fair Value, Total	200,745	185,525
Securities Held To Maturity, Unrealized Losses, Total	$ (4,255)	$ (4,475)
U.S. Government-Sponsored Entities [Member] | Less than 12 Months [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities | Security	11	10
Agency Mortgage-Backed Securities [Member]
Schedule Of Securities [Line Items]
Number of available for sale securities, Less than 1 year | Security	56	55
Number of available for sale securities | Security	56	55
Securities Available For Sale, Less than 12 Months, Fair Value	$ 1,176,464	$ 1,056,731
Securities Available For Sale, Less than 12 Months, Unrealized Losses	(10,753)	(16,994)
Securities Available For Sale, Fair Value, Total	1,176,464	1,056,731
Securities Available For Sale, Unrealized Losses, Total	$ (10,753)	$ (16,994)
Number of held to maturity securities | Security	38	36
Securities Held To Maturity, Less than 12 Months, Fair Value	$ 695,915	$ 551,404
Securities Held To Maturity, Less than 12 Months, Unrealized Losses	(6,795)	(8,645)
Securities Held To Maturity, Fair Value, Total	695,915	551,404
Securities Held To Maturity, Unrealized Losses, Total	$ (6,795)	$ (8,645)
Agency Mortgage-Backed Securities [Member] | Less than 12 Months [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities | Security	38	36
Agency Collateralized Mortgage Obligations [Member]
Schedule Of Securities [Line Items]
Number of available for sale securities, Less than 1 year | Security	29	26
Number of available for sale securities, Greater than 1 year | Security	9	9
Number of available for sale securities | Security	38	35
Securities Available For Sale, Less than 12 Months, Fair Value	$ 364,095	$ 346,662
Securities Available For Sale, Less than 12 Months, Unrealized Losses	(6,990)	(7,261)
Securities Available For Sale, 12 Months or More, Fair Value	84,869	89,040
Securities Available For Sale, 12 Months or More, Unrealized Losses	(3,626)	(3,843)
Securities Available For Sale, Fair Value, Total	448,964	435,702
Securities Available For Sale, Unrealized Losses, Total	$ (10,616)	$ (11,104)
Number of held to maturity securities | Security	41	41
Securities Held To Maturity, Less than 12 Months, Fair Value	$ 498,743	$ 516,237
Securities Held To Maturity, Less than 12 Months, Unrealized Losses	(13,236)	(13,710)
Securities Held To Maturity, Greater than 12 Months, Fair Value	107,546	112,690
Securities Held To Maturity, Greater than 12 Months, Unrealized Losses	(3,767)	(4,091)
Securities Held To Maturity, Fair Value, Total	606,289	628,927
Securities Held To Maturity, Unrealized Losses, Total	$ (17,003)	$ (17,801)
Agency Collateralized Mortgage Obligations [Member] | Less than 12 Months [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities | Security	29	29
Agency Collateralized Mortgage Obligations [Member] | Greater than 12 Months [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities | Security	12	12
Non-Agency Collateralized Mortgage Obligations [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities | Security		3
Securities Held To Maturity, Less than 12 Months, Fair Value		$ 1,128
Securities Held To Maturity, Less than 12 Months, Unrealized Losses		(6)
Securities Held To Maturity, Fair Value, Total		1,128
Securities Held To Maturity, Unrealized Losses, Total		$ (6)
Non-Agency Collateralized Mortgage Obligations [Member] | Less than 12 Months [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities | Security		3
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	$ 419	$ 1,291
Securities Available For Sale, Less than 12 Months, Unrealized Losses	(1)	(1)
Securities Available For Sale, Fair Value, Total	419	1,291
Securities Available For Sale, Unrealized Losses, Total	$ (1)	$ (1)
Number of held to maturity securities | Security	4	2
Securities Held To Maturity, Less than 12 Months, Fair Value	$ 14,875	$ 12,317
Securities Held To Maturity, Less than 12 Months, Unrealized Losses	(67)	(10)
Securities Held To Maturity, Greater than 12 Months, Fair Value	7,684	8,267
Securities Held To Maturity, Greater than 12 Months, Unrealized Losses	(235)	(216)
Securities Held To Maturity, Fair Value, Total	22,559	20,584
Securities Held To Maturity, Unrealized Losses, Total	$ (302)	$ (226)
Commercial Mortgage-Backed Securities [Member] | Less than 12 Months [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities | Security	3	1
Commercial Mortgage-Backed Securities [Member] | Greater than 12 Months [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities | Security	1	1
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	11	20
Number of available for sale securities, Greater than 1 year | Security	5
Number of available for sale securities | Security	16	20
Securities Available For Sale, Less than 12 Months, Fair Value	$ 17,762	$ 28,631
Securities Available For Sale, Less than 12 Months, Unrealized Losses	(72)	(302)
Securities Available For Sale, 12 Months or More, Fair Value	5,834
Securities Available For Sale, 12 Months or More, Unrealized Losses	(82)
Securities Available For Sale, Fair Value, Total	23,596	28,631
Securities Available For Sale, Unrealized Losses, Total	$ (154)	$ (302)
Number of held to maturity securities | Security	103	94
Securities Held To Maturity, Less than 12 Months, Fair Value	$ 279,356	$ 247,301
Securities Held To Maturity, Less than 12 Months, Unrealized Losses	(18,851)	(19,638)
Securities Held To Maturity, Fair Value, Total	279,356	247,301
Securities Held To Maturity, Unrealized Losses, Total	$ (18,851)	$ (19,638)
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	103	94
Other Debt 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	$ 4,534	$ 4,470
Securities Available For Sale, 12 Months or More, Unrealized Losses	(373)	(435)
Securities Available For Sale, Fair Value, Total	4,534	4,470
Securities Available For Sale, Unrealized Losses, Total	$ (373)	$ (435)
Equity Securities [Member]
Schedule Of Securities [Line Items]
Number of available for sale securities, Less than 1 year | Security	5
Number of available for sale securities | Security	5
Securities Available For Sale, Less than 12 Months, Fair Value	$ 703
Securities Available For Sale, Less than 12 Months, Unrealized Losses	(97)
Securities Available For Sale, Fair Value, Total	703
Securities Available For Sale, Unrealized Losses, Total	$ (97)

Securities - Additional Informa

Securities - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Schedule Of Securities [Line Items]
OTTI losses on securities	$ 0	$ 0
Municipal bond portfolio, value	$ 584,500,000
Percentage of formal credit enhancement insurance of municipalities	66.00%
Municipal Bonds [Member] | Weighted Average [Member]
Schedule Of Securities [Line Items]
Average holding size of securities in bond portfolio	$ 2,300,000
Municipal Bonds [Member] | Credit Concentration Risk [Member] | General Obligation Bonds [Member] | A Rating [Member] | Minimum [Member]
Schedule Of Securities [Line Items]
Percentage of portfolio	99.00%
Municipal Bonds [Member] | Geographic Concentration Risk [Member] | Pennsylvania, Ohio and Maryland [Member]
Schedule Of Securities [Line Items]
Percentage of portfolio	69.70%

Loans and Leases - Summary of L

Loans and Leases - Summary of Loans and Leases, Net of Unearned Income (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	$ 20,177,650	$ 14,896,943
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	8,768,357	5,435,162
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	3,792,679	3,042,781
Commercial Leases [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	197,071	196,636
Total Commercial Loans and Leases [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	12,758,107	8,674,579
Direct Installment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	1,965,118	1,844,399
Residential Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	2,342,167	1,844,574
Indirect Installment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	1,259,947	1,196,313
Consumer Lines of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	1,805,996	1,301,200
Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	46,315	35,878
Originated Loans and Leases [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	13,034,528	12,547,987
Originated Loans and Leases [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	4,262,270	4,095,817
Originated Loans and Leases [Member] | Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	2,857,584	2,711,886
Originated Loans and Leases [Member] | Commercial Leases [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	197,071	196,636
Originated Loans and Leases [Member] | Total Commercial Loans and Leases [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	7,316,925	7,004,339
Originated Loans and Leases [Member] | Direct Installment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	1,758,895	1,765,257
Originated Loans and Leases [Member] | Residential Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	1,551,928	1,446,776
Originated Loans and Leases [Member] | Indirect Installment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	1,259,770	1,196,110
Originated Loans and Leases [Member] | Consumer Lines of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	1,100,695	1,099,627
Originated Loans and Leases [Member] | Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	46,315	35,878
Acquired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	7,143,122	2,348,956
Acquired Loans [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	4,506,087	1,339,345
Acquired Loans [Member] | Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	935,095	330,895
Acquired Loans [Member] | Total Commercial Loans and Leases [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	5,441,182	1,670,240
Acquired Loans [Member] | Direct Installment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	206,223	79,142
Acquired Loans [Member] | Residential Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	790,239	397,798
Acquired Loans [Member] | Indirect Installment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	177	203
Acquired Loans [Member] | Consumer Lines of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	$ 705,301	$ 201,573

Loans and Leases - Certain Info

Loans and Leases - Certain Information Relating to Regency Consumer Finance Loans (Detail) - Consumer Lines of Credit [Member] - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Loans and Leases Receivable Disclosure [Line Items]
Regency consumer finance loans	$ 173,786	$ 184,687
Loan Portfolio Diversification Risk [Member] | Loans and Leases Receivable Net of Deferred Income [Member]
Loans and Leases Receivable Disclosure [Line Items]
Percent of total loans and leases	0.90%	1.20%

Loans and Leases - Certain In58

Loans and Leases - Certain Information Relating to Commercial Real Estate Loans (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Loans and Leases Receivable Disclosure [Line Items]
Commercial construction loans	$ 1,050,129	$ 459,995
Credit Concentration Risk [Member] | Commercial Construction Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Percent of total loans and leases	5.20%	3.10%
Loan Portfolio Diversification Risk [Member] | Commercial Real Estate Loans [Member] | Owner-Occupied [Member]
Loans and Leases Receivable Disclosure [Line Items]
Percent of total loans and leases	37.40%	36.20%
Loan Portfolio Diversification Risk [Member] | Commercial Real Estate Loans [Member] | Non-Owner-Occupied [Member]
Loans and Leases Receivable Disclosure [Line Items]
Percent of total loans and leases	62.60%	63.80%

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, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount	$ 20,177,650	$ 14,896,943
Accounted for under ASC 310-30 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	7,205,696	2,346,687
Carrying amount	6,644,633	2,015,904
Accounted for under ASC 310-20 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	502,001	342,015
Carrying amount	491,921	325,784
Acquired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	7,707,697	2,688,702
Carrying amount	$ 7,136,554	$ 2,341,688

Loans and Leases - Additional I

Loans and Leases - Additional Information (Detail) - USD ($)	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount	$ 20,177,650,000	$ 14,896,943,000	$ 20,177,650,000		$ 14,896,943,000
Reclassification from non-accretable difference			23,106,000	$ 10,494,000
Loans acquired and accounted for under ASC 310-30, Fair value	4,257,680,000		4,257,680,000
Loans acquired and accounted for under ASC 310-30, Contractual cash flows not expected to be collected	5,133,416,000		$ 5,133,416,000
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
Interest income on impaired loans			1,900,000	$ 1,200,000
Restructured loans returned to performing status			1,800,000
Valuation for impairment of loans with pooled reserves	500,000	500,000	500,000		500,000
Pooled reserves for all other classes of loans			3,700,000		3,700,000
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	5,000,000		5,000,000
Loans acquired and accounted for under ASC 310-30, Unpaid principal balance	5,200,000		5,200,000
Loans acquired and accounted for under ASC 310-30, Contractual cash flows not expected to be collected	6,200,000		6,200,000
Purchased Credit-Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount	$ 11,800,000	$ 2,800,000	$ 11,800,000		2,800,000
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	$ 5,900,000	$ 5,300,000	$ 5,900,000		5,300,000
Mortgage loans on real estate, foreclosure			$ 11,900,000		$ 12,000,000

Loans and Leases - Summary of C

Loans and Leases - Summary of Change in Accretable Yield of Acquired Loans (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period [Abstract]
Balance at beginning of period	$ 467,070	$ 256,120
Acquisitions	443,261	284,092
Reduction due to unexpected early payoffs	(20,560)	(9,375)
Reclass from non-accretable difference	23,106	10,494
Disposals/transfers	(36)	(260)
Accretion	(25,241)	(13,204)
Balance at end of period	$ 887,600	$ 527,867

Loans and Leases - Summary of A

Loans and Leases - Summary of Acquisition of Purchased Loans (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Contractually required cash flows at acquisition	$ 5,133,416
Non-accretable difference (expected losses and foregone interest)	(432,475)
Cash flows expected to be collected at acquisition	4,700,941
Accretable yield	(25,241)	$ (13,204)
Fair value of acquired loans at acquisition	4,257,680
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	48,941
Non-accretable difference (expected losses and foregone interest)	(25,673)
Cash flows expected to be collected at acquisition	23,268
Accretable yield	(3,323)
Fair value of acquired loans at acquisition	19,945
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	5,084,475
Non-accretable difference (expected losses and foregone interest)	(406,802)
Cash flows expected to be collected at acquisition	4,677,673
Accretable yield	(439,938)
Fair value of acquired loans at acquisition	$ 4,237,735

Loans and Leases - Summary of N

Loans and Leases - Summary of Non-Performing Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled debt restructurings	$ 51,236	$ 46,933
Non-Performing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	81,390	65,479
Troubled debt restructurings	23,988	20,428
Total non-performing loans	105,378	85,907
Other real estate owned (OREO)	50,088	32,490
Total non-performing assets	$ 155,466	$ 118,397
Non-performing loans / total loans and leases	0.52%	0.58%
Non-performing loans + OREO / total loans and leases + OREO	0.77%	0.79%
Non-performing assets / of total assets	0.51%	0.54%

Loans and Leases - Age Analysis

Loans and Leases - Age Analysis of Past Due Loans, by Class (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	$ 20,177,650	$ 14,896,943
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	8,768,357	5,435,162
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	3,792,679	3,042,781
Commercial Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	197,071	196,636
Total Commercial Loans and Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	12,758,107	8,674,579
Direct Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	1,965,118	1,844,399
Residential Mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	2,342,167	1,844,574
Indirect Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	1,259,947	1,196,313
Consumer Lines of Credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	1,805,996	1,301,200
Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	46,315	35,878
Originated Loans and Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	38,398	59,850
> 90 Days Past Due and Still Accruing	6,932	9,113
Non-Accrual	76,294	62,083
Total Past Due	121,624	131,046
Current	12,912,904	12,416,941
Total Loans	13,034,528	12,547,987
Originated Loans and Leases [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	5,923	8,452
> 90 Days Past Due and Still Accruing	1	1
Non-Accrual	23,040	20,114
Total Past Due	28,964	28,567
Current	4,233,306	4,067,250
Total Loans	4,262,270	4,095,817
Originated Loans and Leases [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	5,007	16,019
> 90 Days Past Due and Still Accruing	3	3
Non-Accrual	34,826	24,141
Total Past Due	39,836	40,163
Current	2,817,748	2,671,723
Total Loans	2,857,584	2,711,886
Originated Loans and Leases [Member] | Commercial Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	1,039	973
> 90 Days Past Due and Still Accruing		1
Non-Accrual	2,017	3,429
Total Past Due	3,056	4,403
Current	194,015	192,233
Total Loans	197,071	196,636
Originated Loans and Leases [Member] | Total Commercial Loans and Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	11,969	25,444
> 90 Days Past Due and Still Accruing	4	5
Non-Accrual	59,883	47,684
Total Past Due	71,856	73,133
Current	7,245,069	6,931,206
Total Loans	7,316,925	7,004,339
Originated Loans and Leases [Member] | Direct Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	7,973	10,573
> 90 Days Past Due and Still Accruing	4,092	4,386
Non-Accrual	7,675	6,484
Total Past Due	19,740	21,443
Current	1,739,155	1,743,814
Total Loans	1,758,895	1,765,257
Originated Loans and Leases [Member] | Residential Mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	9,797	10,594
> 90 Days Past Due and Still Accruing	1,966	3,014
Non-Accrual	4,466	3,316
Total Past Due	16,229	16,924
Current	1,535,699	1,429,852
Total Loans	1,551,928	1,446,776
Originated Loans and Leases [Member] | Indirect Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	5,678	9,312
> 90 Days Past Due and Still Accruing	374	513
Non-Accrual	1,488	1,983
Total Past Due	7,540	11,808
Current	1,252,230	1,184,302
Total Loans	1,259,770	1,196,110
Originated Loans and Leases [Member] | Consumer Lines of Credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	2,739	3,529
> 90 Days Past Due and Still Accruing	375	1,112
Non-Accrual	1,782	1,616
Total Past Due	4,896	6,257
Current	1,095,799	1,093,370
Total Loans	1,100,695	1,099,627
Originated Loans and Leases [Member] | Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	242	398
> 90 Days Past Due and Still Accruing	121	83
Non-Accrual	1,000	1,000
Total Past Due	1,363	1,481
Current	44,952	34,397
Total Loans	46,315	35,878
Acquired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	85,170	24,210
> 90 Days Past Due and Still Accruing	69,213	40,524
Non-Accrual	5,096	3,396
Total Past Due	159,479	68,130
Current	7,307,691	2,430,340
Discount	(324,048)	(149,514)
Total Loans	7,143,122	2,348,956
Acquired Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	41,450	9,501
> 90 Days Past Due and Still Accruing	39,243	23,890
Non-Accrual	1,414	949
Total Past Due	82,107	34,340
Current	4,630,159	1,384,752
Discount	(206,179)	(79,747)
Total Loans	4,506,087	1,339,345
Acquired Loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	7,587	1,789
> 90 Days Past Due and Still Accruing	7,736	2,942
Non-Accrual	2,854	2,111
Total Past Due	18,177	6,842
Current	977,012	353,494
Discount	(60,094)	(29,441)
Total Loans	935,095	330,895
Acquired Loans [Member] | Total Commercial Loans and Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	49,037	11,290
> 90 Days Past Due and Still Accruing	46,979	26,832
Non-Accrual	4,268	3,060
Total Past Due	100,284	41,182
Current	5,607,171	1,738,246
Discount	(266,273)	(109,188)
Total Loans	5,441,182	1,670,240
Acquired Loans [Member] | Direct Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	5,669	2,317
> 90 Days Past Due and Still Accruing	2,183	1,344
Non-Accrual	81
Total Past Due	7,933	3,661
Current	196,563	73,479
Discount	1,727	2,002
Total Loans	206,223	79,142
Acquired Loans [Member] | Residential Mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	19,069	8,428
> 90 Days Past Due and Still Accruing	14,075	10,816
Total Past Due	33,144	19,244
Current	800,460	416,561
Discount	(43,365)	(38,007)
Total Loans	790,239	397,798
Acquired Loans [Member] | Indirect Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due		19
> 90 Days Past Due and Still Accruing	2	4
Total Past Due	2	23
Current	75	96
Discount	100	84
Total Loans	177	203
Acquired Loans [Member] | Consumer Lines of Credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-89 Days Past Due	11,395	2,156
> 90 Days Past Due and Still Accruing	5,974	1,528
Non-Accrual	747	336
Total Past Due	18,116	4,020
Current	703,422	201,958
Discount	(16,237)	(4,405)
Total Loans	$ 705,301	$ 201,573

Loans and Leases - Summary of65

Loans and Leases - Summary of Commercial Loans and Leases by Credit Quality (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	$ 20,177,650	$ 14,896,943
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	8,768,357	5,435,162
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	3,792,679	3,042,781
Commercial Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	197,071	196,636
Total Commercial Loans and Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	12,758,107	8,674,579
Originated Loans and Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	13,034,528	12,547,987
Originated Loans and Leases [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	4,262,270	4,095,817
Originated Loans and Leases [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	2,857,584	2,711,886
Originated Loans and Leases [Member] | Commercial Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	197,071	196,636
Originated Loans and Leases [Member] | Total Commercial Loans and Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	7,316,925	7,004,339
Acquired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	7,143,122	2,348,956
Acquired Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	4,506,087	1,339,345
Acquired Loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	935,095	330,895
Acquired Loans [Member] | Total Commercial Loans and Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	5,441,182	1,670,240
Pass [Member] | Originated Loans and Leases [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	4,068,403	3,895,764
Pass [Member] | Originated Loans and Leases [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	2,616,144	2,475,955
Pass [Member] | Originated Loans and Leases [Member] | Commercial Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	190,641	188,662
Pass [Member] | Originated Loans and Leases [Member] | Total Commercial Loans and Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	6,875,188	6,560,381
Pass [Member] | Acquired Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	3,699,904	1,144,676
Pass [Member] | Acquired Loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	786,808	274,819
Pass [Member] | Acquired Loans [Member] | Total Commercial Loans and Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	4,486,712	1,419,495
Special Mention [Member] | Originated Loans and Leases [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	132,700	130,452
Special Mention [Member] | Originated Loans and Leases [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	122,892	104,652
Special Mention [Member] | Originated Loans and Leases [Member] | Commercial Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	3,711	3,789
Special Mention [Member] | Originated Loans and Leases [Member] | Total Commercial Loans and Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	259,303	238,893
Special Mention [Member] | Acquired Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	531,316	85,894
Special Mention [Member] | Acquired Loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	77,961	20,593
Special Mention [Member] | Acquired Loans [Member] | Total Commercial Loans and Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	609,277	106,487
Substandard [Member] | Originated Loans and Leases [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	60,958	69,588
Substandard [Member] | Originated Loans and Leases [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	109,515	128,089
Substandard [Member] | Originated Loans and Leases [Member] | Commercial Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	2,719	4,185
Substandard [Member] | Originated Loans and Leases [Member] | Total Commercial Loans and Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	173,192	201,862
Substandard [Member] | Acquired Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	274,506	108,128
Substandard [Member] | Acquired Loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	70,171	34,967
Substandard [Member] | Acquired Loans [Member] | Total Commercial Loans and Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	344,677	143,095
Doubtful [Member] | Originated Loans and Leases [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	209	13
Doubtful [Member] | Originated Loans and Leases [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	9,033	3,190
Doubtful [Member] | Originated Loans and Leases [Member] | Total Commercial Loans and Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	9,242	3,203
Doubtful [Member] | Acquired Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	361	647
Doubtful [Member] | Acquired Loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	155	516
Doubtful [Member] | Acquired Loans [Member] | Total Commercial Loans and Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	$ 516	$ 1,163

Loans and Leases - Summary of66

Loans and Leases - Summary of Consumer Loans by Payment Status (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Credit Quality [Line Items]
Total Loans	$ 20,177,650	$ 14,896,943
Non-Performing [Member]
Credit Quality [Line Items]
Non-Performing Loans	105,378	85,907
Direct Installment [Member]
Credit Quality [Line Items]
Total Loans	1,965,118	1,844,399
Residential Mortgages [Member]
Credit Quality [Line Items]
Total Loans	2,342,167	1,844,574
Indirect Installment [Member]
Credit Quality [Line Items]
Total Loans	1,259,947	1,196,313
Originated Loans and Leases [Member]
Credit Quality [Line Items]
Total Loans	13,034,528	12,547,987
Originated Loans and Leases [Member] | Consumer Loan [Member]
Credit Quality [Line Items]
Total Loans	5,671,288	5,507,770
Originated Loans and Leases [Member] | Performing [Member]
Credit Quality [Line Items]
Performing Loans	5,636,346	5,474,286
Originated Loans and Leases [Member] | Non-Performing [Member]
Credit Quality [Line Items]
Non-Performing Loans	34,942	33,484
Originated Loans and Leases [Member] | Direct Installment [Member]
Credit Quality [Line Items]
Total Loans	1,758,895	1,765,257
Originated Loans and Leases [Member] | Direct Installment [Member] | Consumer Loan [Member]
Credit Quality [Line Items]
Total Loans	1,758,895	1,765,257
Originated Loans and Leases [Member] | Direct Installment [Member] | Performing [Member]
Credit Quality [Line Items]
Performing Loans	1,742,702	1,750,305
Originated Loans and Leases [Member] | Direct Installment [Member] | Non-Performing [Member]
Credit Quality [Line Items]
Non-Performing Loans	16,193	14,952
Originated Loans and Leases [Member] | Residential Mortgages [Member]
Credit Quality [Line Items]
Total Loans	1,551,928	1,446,776
Originated Loans and Leases [Member] | Residential Mortgages [Member] | Consumer Loan [Member]
Credit Quality [Line Items]
Total Loans	1,551,928	1,446,776
Originated Loans and Leases [Member] | Residential Mortgages [Member] | Performing [Member]
Credit Quality [Line Items]
Performing Loans	1,537,779	1,433,409
Originated Loans and Leases [Member] | Residential Mortgages [Member] | Non-Performing [Member]
Credit Quality [Line Items]
Non-Performing Loans	14,149	13,367
Originated Loans and Leases [Member] | Indirect Installment [Member]
Credit Quality [Line Items]
Total Loans	1,259,770	1,196,110
Originated Loans and Leases [Member] | Indirect Installment [Member] | Consumer Loan [Member]
Credit Quality [Line Items]
Total Loans	1,259,770	1,196,110
Originated Loans and Leases [Member] | Indirect Installment [Member] | Performing [Member]
Credit Quality [Line Items]
Performing Loans	1,258,084	1,193,930
Originated Loans and Leases [Member] | Indirect Installment [Member] | Non-Performing [Member]
Credit Quality [Line Items]
Non-Performing Loans	1,686	2,180
Originated Loans and Leases [Member] | Consumer Lines of Credit [Member] | Consumer Loan [Member]
Credit Quality [Line Items]
Total Loans	1,100,695	1,099,627
Originated Loans and Leases [Member] | Consumer Lines of Credit [Member] | Performing [Member]
Credit Quality [Line Items]
Performing Loans	1,097,781	1,096,642
Originated Loans and Leases [Member] | Consumer Lines of Credit [Member] | Non-Performing [Member]
Credit Quality [Line Items]
Non-Performing Loans	2,914	2,985
Acquired Loans [Member]
Credit Quality [Line Items]
Total Loans	7,143,122	2,348,956
Acquired Loans [Member] | Consumer Loan [Member]
Credit Quality [Line Items]
Total Loans	1,701,940	678,716
Acquired Loans [Member] | Performing [Member]
Credit Quality [Line Items]
Performing Loans	1,698,943	678,204
Acquired Loans [Member] | Non-Performing [Member]
Credit Quality [Line Items]
Non-Performing Loans	2,997	512
Acquired Loans [Member] | Direct Installment [Member]
Credit Quality [Line Items]
Total Loans	206,223	79,142
Acquired Loans [Member] | Direct Installment [Member] | Consumer Loan [Member]
Credit Quality [Line Items]
Total Loans	206,223	79,142
Acquired Loans [Member] | Direct Installment [Member] | Performing [Member]
Credit Quality [Line Items]
Performing Loans	206,138	79,142
Acquired Loans [Member] | Direct Installment [Member] | Non-Performing [Member]
Credit Quality [Line Items]
Non-Performing Loans	85
Acquired Loans [Member] | Residential Mortgages [Member]
Credit Quality [Line Items]
Total Loans	790,239	397,798
Acquired Loans [Member] | Residential Mortgages [Member] | Consumer Loan [Member]
Credit Quality [Line Items]
Total Loans	790,239	397,798
Acquired Loans [Member] | Residential Mortgages [Member] | Performing [Member]
Credit Quality [Line Items]
Performing Loans	788,656	397,798
Acquired Loans [Member] | Residential Mortgages [Member] | Non-Performing [Member]
Credit Quality [Line Items]
Non-Performing Loans	1,583
Acquired Loans [Member] | Indirect Installment [Member]
Credit Quality [Line Items]
Total Loans	177	203
Acquired Loans [Member] | Indirect Installment [Member] | Consumer Loan [Member]
Credit Quality [Line Items]
Total Loans	177	203
Acquired Loans [Member] | Indirect Installment [Member] | Performing [Member]
Credit Quality [Line Items]
Performing Loans	177	203
Acquired Loans [Member] | Consumer Lines of Credit [Member] | Consumer Loan [Member]
Credit Quality [Line Items]
Total Loans	705,301	201,573
Acquired Loans [Member] | Consumer Lines of Credit [Member] | Performing [Member]
Credit Quality [Line Items]
Performing Loans	703,972	201,061
Acquired Loans [Member] | Consumer Lines of Credit [Member] | Non-Performing [Member]
Credit Quality [Line Items]
Non-Performing Loans	$ 1,329	$ 512

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, 2017	Dec. 31, 2016
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	$ 108,588	$ 93,479
Recorded Investment With No Specific Reserve	71,280	72,393
Recorded Investment With Specific Reserve	24,094	9,460
Total Recorded Investment	95,374	81,853
Specific Reserve	9,247	3,203
Average Recorded Investment	88,613	86,388
Commercial Real Estate [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	27,470	23,771
Recorded Investment With No Specific Reserve	21,266	19,699
Recorded Investment With Specific Reserve	1,795	464
Total Recorded Investment	23,061	20,163
Specific Reserve	209	13
Average Recorded Investment	21,612	19,217
Commercial and Industrial [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	36,889	25,719
Recorded Investment With No Specific Reserve	12,055	14,781
Recorded Investment With Specific Reserve	22,299	8,996
Total Recorded Investment	34,354	23,777
Specific Reserve	9,038	3,190
Average Recorded Investment	29,065	29,730
Commercial Leases [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	2,017	3,429
Recorded Investment With No Specific Reserve	2,017	3,429
Total Recorded Investment	2,017	3,429
Average Recorded Investment	2,723	3,394
Total Commercial Loans and Leases [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	66,376	52,919
Recorded Investment With No Specific Reserve	35,338	37,909
Recorded Investment With Specific Reserve	24,094	9,460
Total Recorded Investment	59,432	47,369
Specific Reserve	9,247	3,203
Average Recorded Investment	53,400	52,341
Direct Installment [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	18,062	16,440
Recorded Investment With No Specific Reserve	16,193	14,952
Total Recorded Investment	16,193	14,952
Average Recorded Investment	15,572	14,997
Residential Mortgages [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	15,151	14,090
Recorded Investment With No Specific Reserve	14,149	13,367
Total Recorded Investment	14,149	13,367
Average Recorded Investment	13,758	13,200
Indirect Installment [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	4,168	5,172
Recorded Investment With No Specific Reserve	1,686	2,180
Total Recorded Investment	1,686	2,180
Average Recorded Investment	1,933	2,037
Consumer Lines of Credit [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	3,831	3,858
Recorded Investment With No Specific Reserve	2,914	2,985
Total Recorded Investment	2,914	2,985
Average Recorded Investment	2,950	2,813
Other [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	1,000	1,000
Recorded Investment With No Specific Reserve	1,000	1,000
Total Recorded Investment	1,000	1,000
Average Recorded Investment	$ 1,000	$ 1,000

Loans and Leases - Additional A

Loans and Leases - Additional Allowance for Credit Losses Relating to Acquired Loans (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Total allowance on acquired loans	$ 6,568	$ 7,268
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total allowance on acquired loans	3,734	4,538
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total allowance on acquired loans	127	500
Total Commercial Loans and Leases [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total allowance on acquired loans	3,861	5,038
Direct Installment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total allowance on acquired loans	994	1,005
Residential Mortgages [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total allowance on acquired loans	795	632
Indirect Installment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total allowance on acquired loans	221	221
Consumer Lines of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total allowance on acquired loans	$ 697	$ 372

Loans and Leases - Summary of P

Loans and Leases - Summary of Payment Status of TDRs (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings ("TDRs")	$ 51,236	$ 46,933
Originated Loans and Leases [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings ("TDRs")	46,073	46,392
Acquired Loans [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings ("TDRs")	5,163	541
Performing [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings ("TDRs")	17,824	17,470
Performing [Member] | Originated Loans and Leases [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings ("TDRs")	17,552	17,105
Performing [Member] | Acquired Loans [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings ("TDRs")	272	365
Non-Performing [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings ("TDRs")	23,988	20,428
Non-Performing [Member] | Originated Loans and Leases [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings ("TDRs")	19,659	20,252
Non-Performing [Member] | Acquired Loans [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings ("TDRs")	4,329	176
Non-Accrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings ("TDRs")	9,424	9,035
Non-Accrual [Member] | Originated Loans and Leases [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings ("TDRs")	8,862	$ 9,035
Non-Accrual [Member] | Acquired Loans [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings ("TDRs")	$ 562

Loans and Leases - Reserve for

Loans and Leases - Reserve for Commercial TDRs Included in Allowance for Credit Losses (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Financing Receivable, Modifications [Line Items]
Reserves in allowance for loan losses, TDRs	$ 160,782	$ 158,059	$ 147,800	$ 142,012
Total Commercial Loans and Leases [Member]
Financing Receivable, Modifications [Line Items]
Reserves in allowance for loan losses, TDRs	103,472	97,906	$ 94,579	$ 85,305
Specific Reserves for Commercial TDRs [Member] | Total Commercial Loans and Leases [Member]
Financing Receivable, Modifications [Line Items]
Reserves in allowance for loan losses, TDRs	253	291
Pooled Reserves for Individual Commercial Loans [Member] | Total Commercial Loans and Leases [Member]
Financing Receivable, Modifications [Line Items]
Reserves in allowance for loan losses, TDRs	$ 234	$ 276

Loans and Leases - Reserve fo71

Loans and Leases - Reserve for Commercial TDRs Included in Allowance for Credit Losses (Parenthetical) (Detail) - USD ($)	Mar. 31, 2017	Dec. 31, 2016
Receivables [Abstract]
Valuation for impairment of loans with pooled reserves	$ 500,000	$ 500,000

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, 2017USD ($)Contract	Mar. 31, 2016USD ($)Contract
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	207	192
Pre-Modification Outstanding Recorded Investment	$ 2,524	$ 9,556
Post-Modification Outstanding Recorded Investment	$ 2,440	$ 7,201
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	1	4
Pre-Modification Outstanding Recorded Investment	$ 114	$ 778
Post-Modification Outstanding Recorded Investment	$ 109	$ 760
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	1	6
Pre-Modification Outstanding Recorded Investment	$ 114	$ 6,343
Post-Modification Outstanding Recorded Investment	$ 109	$ 4,039
Direct Installment [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	171	145
Pre-Modification Outstanding Recorded Investment	$ 1,488	$ 1,991
Post-Modification Outstanding Recorded Investment	$ 1,412	$ 1,961
Residential Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	8	18
Pre-Modification Outstanding Recorded Investment	$ 163	$ 968
Post-Modification Outstanding Recorded Investment	$ 176	$ 951
Indirect Installment [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	5	3
Pre-Modification Outstanding Recorded Investment	$ 17	$ 11
Post-Modification Outstanding Recorded Investment	$ 14	$ 12
Consumer Lines of Credit [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	22	20
Pre-Modification Outstanding Recorded Investment	$ 742	$ 243
Post-Modification Outstanding Recorded Investment	$ 729	$ 238

Loans and Leases - Summary of73

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, 2017USD ($)Contract	Mar. 31, 2016USD ($)Contract
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	38	34
Recorded Investment | $	$ 350	$ 240
Direct Installment [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	29	28
Recorded Investment | $	$ 82	$ 175
Residential Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	2	1
Recorded Investment | $	$ 224	$ 50
Indirect Installment [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	6	4
Recorded Investment | $	$ 10	$ 5
Consumer Lines of Credit [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	1	1
Recorded Investment | $	$ 34	$ 10

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, 2017	Mar. 31, 2016
Schedule Of Allowance For Loan Losses [Line Items]
Balance at Beginning of Period	$ 158,059	$ 142,012
Charge- Offs	(11,294)	(7,884)
Recoveries	3,167	1,904
Net Charge- Offs	(8,127)	(5,980)
Provision for credit losses	10,850	11,768
Balance at End of Period	160,782	147,800
Originated Loans and Leases [Member]
Schedule Of Allowance For Loan Losses [Line Items]
Balance at Beginning of Period	150,791	135,285
Charge- Offs	(10,812)	(7,503)
Recoveries	2,898	1,598
Net Charge- Offs	(7,914)	(5,905)
Provision for credit losses	11,337	12,840
Balance at End of Period	154,214	142,220
Acquired Loans [Member]
Schedule Of Allowance For Loan Losses [Line Items]
Balance at Beginning of Period	7,268	6,727
Charge- Offs	(482)	(381)
Recoveries	269	306
Net Charge- Offs	(213)	(75)
Provision for credit losses	(487)	(1,072)
Balance at End of Period	6,568	5,580
Commercial Real Estate [Member]
Schedule Of Allowance For Loan Losses [Line Items]
Balance at Beginning of Period	46,635	41,741
Charge- Offs	(988)	(1,369)
Recoveries	361	597
Net Charge- Offs	(627)	(772)
Provision for credit losses	381	2,929
Balance at End of Period	46,389	43,898
Commercial and Industrial [Member]
Schedule Of Allowance For Loan Losses [Line Items]
Balance at Beginning of Period	47,991	41,023
Charge- Offs	(2,463)	(298)
Recoveries	474	190
Net Charge- Offs	(1,989)	(108)
Provision for credit losses	7,568	6,948
Balance at End of Period	53,570	47,863
Commercial Leases [Member]
Schedule Of Allowance For Loan Losses [Line Items]
Balance at Beginning of Period	3,280	2,541
Charge- Offs	(506)	(114)
Recoveries	1	14
Net Charge- Offs	(505)	(100)
Provision for credit losses	738	377
Balance at End of Period	3,513	2,818
Total Commercial Loans and Leases [Member]
Schedule Of Allowance For Loan Losses [Line Items]
Balance at Beginning of Period	97,906	85,305
Charge- Offs	(3,957)	(1,781)
Recoveries	836	801
Net Charge- Offs	(3,121)	(980)
Provision for credit losses	8,687	10,254
Balance at End of Period	103,472	94,579
Direct Installment [Member]
Schedule Of Allowance For Loan Losses [Line Items]
Balance at Beginning of Period	21,391	21,587
Charge- Offs	(2,874)	(2,667)
Recoveries	628	454
Net Charge- Offs	(2,246)	(2,213)
Provision for credit losses	1,065	1,351
Balance at End of Period	20,210	20,725
Residential Mortgages [Member]
Schedule Of Allowance For Loan Losses [Line Items]
Balance at Beginning of Period	10,082	7,909
Charge- Offs	(180)	(85)
Recoveries	161	19
Net Charge- Offs	(19)	(66)
Provision for credit losses	147	(33)
Balance at End of Period	10,210	7,810
Indirect Installment [Member]
Schedule Of Allowance For Loan Losses [Line Items]
Balance at Beginning of Period	10,564	9,889
Charge- Offs	(2,370)	(1,942)
Recoveries	781	262
Net Charge- Offs	(1,589)	(1,680)
Provision for credit losses	655	856
Balance at End of Period	9,630	9,065
Consumer Lines of Credit [Member]
Schedule Of Allowance For Loan Losses [Line Items]
Balance at Beginning of Period	9,456	9,582
Charge- Offs	(458)	(474)
Recoveries	165	56
Net Charge- Offs	(293)	(418)
Provision for credit losses	(280)	(197)
Balance at End of Period	8,883	8,967
Other [Member]
Schedule Of Allowance For Loan Losses [Line Items]
Balance at Beginning of Period	1,392	1,013
Charge- Offs	(973)	(554)
Recoveries	327	6
Net Charge- Offs	(646)	(548)
Provision for credit losses	1,063	609
Balance at End of Period	1,809	1,074
Purchased Credit-Impaired Loans [Member]
Schedule Of Allowance For Loan Losses [Line Items]
Balance at Beginning of Period	572	834
Charge- Offs		(160)
Net Charge- Offs		(160)
Provision for credit losses	88	30
Balance at End of Period	660	704
Other Acquired Loans [Member]
Schedule Of Allowance For Loan Losses [Line Items]
Balance at Beginning of Period	6,696	5,893
Charge- Offs	(482)	(221)
Recoveries	269	306
Net Charge- Offs	(213)	85
Provision for credit losses	(575)	(1,102)
Balance at End of Period	$ 5,908	$ 4,876

Allowance for Credit Losses -75

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, 2017	Dec. 31, 2016
Valuation Allowance [Line Items]
Originated Allowance, Individually Evaluated for Impairment	$ 9,247	$ 3,203
Originated Allowance, Collectively Evaluated for Impairment	144,967	147,588
Loans and Leases	20,177,650	14,896,943
Originated Loans and Leases Outstanding, Individually Evaluated for Impairment	47,146	34,719
Originated Loans and Leases Outstanding, Collectively Evaluated for Impairment	12,987,382	12,513,268
Commercial Real Estate [Member]
Valuation Allowance [Line Items]
Originated Allowance, Individually Evaluated for Impairment	209	13
Originated Allowance, Collectively Evaluated for Impairment	46,180	46,622
Loans and Leases	8,768,357	5,435,162
Originated Loans and Leases Outstanding, Individually Evaluated for Impairment	14,989	12,973
Originated Loans and Leases Outstanding, Collectively Evaluated for Impairment	4,247,281	4,082,844
Commercial and Industrial [Member]
Valuation Allowance [Line Items]
Originated Allowance, Individually Evaluated for Impairment	9,038	3,190
Originated Allowance, Collectively Evaluated for Impairment	44,532	44,801
Loans and Leases	3,792,679	3,042,781
Originated Loans and Leases Outstanding, Individually Evaluated for Impairment	32,157	21,746
Originated Loans and Leases Outstanding, Collectively Evaluated for Impairment	2,825,427	2,690,140
Commercial Leases [Member]
Valuation Allowance [Line Items]
Originated Allowance, Collectively Evaluated for Impairment	3,513	3,280
Loans and Leases	197,071	196,636
Originated Loans and Leases Outstanding, Collectively Evaluated for Impairment	197,071	196,636
Total Commercial Loans and Leases [Member]
Valuation Allowance [Line Items]
Originated Allowance, Individually Evaluated for Impairment	9,247	3,203
Originated Allowance, Collectively Evaluated for Impairment	94,225	94,703
Loans and Leases	12,758,107	8,674,579
Originated Loans and Leases Outstanding, Individually Evaluated for Impairment	47,146	34,719
Originated Loans and Leases Outstanding, Collectively Evaluated for Impairment	7,269,779	6,969,620
Direct Installment [Member]
Valuation Allowance [Line Items]
Originated Allowance, Collectively Evaluated for Impairment	20,210	21,391
Loans and Leases	1,965,118	1,844,399
Originated Loans and Leases Outstanding, Collectively Evaluated for Impairment	1,758,895	1,765,257
Residential Mortgages [Member]
Valuation Allowance [Line Items]
Originated Allowance, Collectively Evaluated for Impairment	10,210	10,082
Loans and Leases	2,342,167	1,844,574
Originated Loans and Leases Outstanding, Collectively Evaluated for Impairment	1,551,928	1,446,776
Indirect Installment [Member]
Valuation Allowance [Line Items]
Originated Allowance, Collectively Evaluated for Impairment	9,630	10,564
Loans and Leases	1,259,947	1,196,313
Originated Loans and Leases Outstanding, Collectively Evaluated for Impairment	1,259,770	1,196,110
Consumer Lines of Credit [Member]
Valuation Allowance [Line Items]
Originated Allowance, Collectively Evaluated for Impairment	8,883	9,456
Loans and Leases	1,805,996	1,301,200
Originated Loans and Leases Outstanding, Collectively Evaluated for Impairment	1,100,695	1,099,627
Other [Member]
Valuation Allowance [Line Items]
Originated Allowance, Collectively Evaluated for Impairment	1,809	1,392
Loans and Leases	46,315	35,878
Originated Loans and Leases Outstanding, Collectively Evaluated for Impairment	46,315	35,878
Originated Loans and Leases [Member]
Valuation Allowance [Line Items]
Loans and Leases	13,034,528	12,547,987
Originated Loans and Leases [Member] | Commercial Real Estate [Member]
Valuation Allowance [Line Items]
Loans and Leases	4,262,270	4,095,817
Originated Loans and Leases [Member] | Commercial and Industrial [Member]
Valuation Allowance [Line Items]
Loans and Leases	2,857,584	2,711,886
Originated Loans and Leases [Member] | Commercial Leases [Member]
Valuation Allowance [Line Items]
Loans and Leases	197,071	196,636
Originated Loans and Leases [Member] | Total Commercial Loans and Leases [Member]
Valuation Allowance [Line Items]
Loans and Leases	7,316,925	7,004,339
Originated Loans and Leases [Member] | Direct Installment [Member]
Valuation Allowance [Line Items]
Loans and Leases	1,758,895	1,765,257
Originated Loans and Leases [Member] | Residential Mortgages [Member]
Valuation Allowance [Line Items]
Loans and Leases	1,551,928	1,446,776
Originated Loans and Leases [Member] | Indirect Installment [Member]
Valuation Allowance [Line Items]
Loans and Leases	1,259,770	1,196,110
Originated Loans and Leases [Member] | Consumer Lines of Credit [Member]
Valuation Allowance [Line Items]
Loans and Leases	1,100,695	1,099,627
Originated Loans and Leases [Member] | Other [Member]
Valuation Allowance [Line Items]
Loans and Leases	$ 46,315	$ 35,878

Loan Servicing - Additional Inf

Loan Servicing - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Servicing Assets at Fair Value [Line Items]
Service charges	$ 24,807,000	$ 21,134,000
Mortgage Servicing Rights [Member]
Servicing Assets at Fair Value [Line Items]
Unpaid principal balance of loans	2,700,000,000		$ 1,800,000,000
Mortgage servicing fees recorded in mortgage banking income	1,600,000	900,000
Valuation allowance	0	$ 0
SBA-Guaranteed Loan Servicing [Member]
Servicing Assets at Fair Value [Line Items]
Unpaid principal balance of loans	255,200,000
Valuation allowance	0
Service charges	$ 300,000

Loan Servicing - Summary of Mor

Loan Servicing - Summary of Mortgage Servicing Rights Activity (Detail) - Mortgage Servicing Rights [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Servicing Assets at Fair Value [Line Items]
Balance at beginning of period	$ 13,521	$ 8,921
Fair value of MSRs acquired	8,553
Additions	1,454	884
Payoffs and curtailments	(139)	(98)
Amortization	(523)	(467)
Balance at end of period	22,866	9,240
Fair value, beginning of period	17,546	11,503
Fair value, end of period	$ 26,962	$ 11,538

Loan Servicing - Summary of the

Loan Servicing - Summary of the Sensitivity of Fair Value of MSRs to Changes in key Assumptions (Detail) - Mortgage Servicing Rights [Member] - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]
Weighted average life (months)	82 months 6 days	79 months
Constant prepayment rate (annualized)	9.40%	9.90%
Discount rate	9.70%	9.80%
Effect on fair value due to change in interest rates of + 0.25%	$ 1,229	$ 692
Effect on fair value due to change in interest rates of + 0.50%	2,298	1,288
Effect on fair value due to change in interest rates of - 0.25%	(1,370)	(789)
Effect on fair value due to change in interest rates of - 0.50%	$ (2,839)	$ (1,680)

Loan Servicing - Summary of Act

Loan Servicing - Summary of Activity in SBA-Guaranteed Loan Servicing Asset (Detail) - SBA-Guaranteed Loan Servicing [Member] $ in Thousands	3 Months Ended
	Mar. 31, 2017USD ($)
Servicing Assets at Fair Value [Line Items]
Fair value of servicing rights acquired	$ 5,399
Additions	0
Amortization	(60)
Balance at end of period	$ 5,339

Borrowings - Summary of Short-T

Borrowings - Summary of Short-Term Borrowings (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Debt Disclosure [Abstract]
Securities sold under repurchase agreements	$ 310,751	$ 313,062
Federal Home Loan Bank advances	1,960,000	1,025,000
Federal funds purchased	1,185,000	1,037,000
Subordinated notes	130,212	127,948
Total short-term borrowings	$ 3,585,963	$ 2,503,010

Borrowings - Summary of Long-Te

Borrowings - Summary of Long-Term Borrowings (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Debt Disclosure [Abstract]
Federal Home Loan Bank advances	$ 330,098	$ 305,110
Subordinated notes	87,558	87,147
Junior subordinated debt	109,987	48,600
Other subordinated debt	168,563	98,637
Total long-term borrowings	$ 696,206	$ 539,494

Borrowings - Additional Informa

Borrowings - Additional Information (Detail)	May 01, 2017USD ($)	Mar. 31, 2017USD ($)Trust	Dec. 31, 2016
Debt Instrument [Line Items]
Number of unconsolidated subsidiary trusts | Trust		6
Percent of the common equity of each Trust owned by the Corporation		100.00%
Yadkin Financial Corporation (YDKN) [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Subordinate debt repaid	$ 7,500,000
FHLB [Member]
Debt Instrument [Line Items]
Credit available with FHLB		$ 6,900,000,000
Credit with FHLB utilized		$ 2,300,000,000
Federal Home Loan Bank advances are scheduled to mature periodically through the year		2,021
Omega Financial Capital Trust I [Member]
Debt Instrument [Line Items]
Redemption of Corporation Issued TPS		$ 10,000,000
Minimum [Member] | FHLB [Member]
Debt Instrument [Line Items]
Effective interest rates		1.03%	0.95%
Maximum [Member] | FHLB [Member]
Debt Instrument [Line Items]
Effective interest rates		4.19%	4.19%

Borrowings - Junior Subordinate

Borrowings - Junior Subordinated Debt Trusts (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Subordinated Borrowing [Line Items]
Junior subordinated debt	$ 109,987	$ 48,600
Trust Preferred Securities Subject to Mandatory Redemption [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	115,500
Common Stock Subject to Mandatory Redemption [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	3,885
F.N.B. Statutory Trust II [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	$ 22,165
Stated Maturity Date	Jun. 15, 2036
Interest Rate	2.78%
Description of variable rate	Variable; LIBOR + 165 basis points (bps)
Basis points	1.65%
F.N.B. Statutory Trust II [Member] | Trust Preferred Securities Subject to Mandatory Redemption [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	$ 21,500
F.N.B. Statutory Trust II [Member] | Common Stock Subject to Mandatory Redemption [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	665
Omega Financial Capital Trust I [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	$ 26,445
Stated Maturity Date	Oct. 18, 2034
Interest Rate	3.21%
Description of variable rate	Variable; LIBOR + 219 bps
Basis points	2.19%
Omega Financial Capital Trust I [Member] | Trust Preferred Securities Subject to Mandatory Redemption [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	$ 26,000
Omega Financial Capital Trust I [Member] | Common Stock Subject to Mandatory Redemption [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	1,114
Yadkin Valley Statutory Trust I [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	$ 20,677
Stated Maturity Date	Dec. 15, 2037
Interest Rate	2.45%
Description of variable rate	Variable; LIBOR + 132 bps
Basis points	1.32%
Yadkin Valley Statutory Trust I [Member] | Trust Preferred Securities Subject to Mandatory Redemption [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	$ 25,000
Yadkin Valley Statutory Trust I [Member] | Common Stock Subject to Mandatory Redemption [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	774
FNB Financial Services Capital Trust I [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	$ 21,635
Stated Maturity Date	Sep. 30, 2035
Interest Rate	2.59%
Description of variable rate	Variable; LIBOR + 146 bps
Basis points	1.46%
FNB Financial Services Capital Trust I [Member] | Trust Preferred Securities Subject to Mandatory Redemption [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	$ 25,000
FNB Financial Services Capital Trust I [Member] | Common Stock Subject to Mandatory Redemption [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	774
American Community Capital Trust II [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	$ 10,455
Stated Maturity Date	Dec. 15, 2033
Interest Rate	3.80%
Description of variable rate	Variable; LIBOR + 280 bps
Basis points	2.80%
American Community Capital Trust II [Member] | Trust Preferred Securities Subject to Mandatory Redemption [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	$ 10,000
American Community Capital Trust II [Member] | Common Stock Subject to Mandatory Redemption [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	310
Crescent Financial Capital Trust I [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	$ 8,610
Stated Maturity Date	Oct. 7, 2033
Interest Rate	4.12%
Description of variable rate	Variable; LIBOR + 310 bps
Basis points	3.10%
Crescent Financial Capital Trust I [Member] | Trust Preferred Securities Subject to Mandatory Redemption [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	$ 8,000
Crescent Financial Capital Trust I [Member] | Common Stock Subject to Mandatory Redemption [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	$ 248

Derivative Instruments and He84

Derivative Instruments and Hedging Activities - Schedule of Notional Amounts and Gross Fair Values of Derivative Assets and Derivative Liabilities (Detail) - USD ($)	Mar. 31, 2017	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Notional amount	$ 4,655,961,000	$ 4,005,212,000
Fair value, asset	32,991,000	54,220,000
Liability	29,834,000	47,267,000
Interest Rate Lock Commitments [Member]
Derivatives, Fair Value [Line Items]
Fair value, asset	1,252,000
Forward Delivery Commitments [Member]
Derivatives, Fair Value [Line Items]
Fair value, asset	20,000
Credit Risk Contracts [Member]
Derivatives, Fair Value [Line Items]
Fair value, asset	15,000	13,000
Subject to Master Netting Arrangements [Member]
Derivatives, Fair Value [Line Items]
Notional amount	2,481,886,000	2,140,337,000
Fair value, asset	1,441,000	22,037,000
Liability	15,460,000	35,217,000
Subject to Master Netting Arrangements [Member] | Interest Rate Contracts [Member]
Derivatives, Fair Value [Line Items]
Notional amount	655,000,000	450,000,000
Fair value, asset	603,000	9,256,000
Liability	1,494,000	1,171,000
Subject to Master Netting Arrangements [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Notional amount	1,825,706,000	1,689,157,000
Fair value, asset	792,000	12,720,000
Liability	13,966,000	34,046,000
Subject to Master Netting Arrangements [Member] | Equity Contracts [Member]
Derivatives, Fair Value [Line Items]
Notional amount	1,180,000	1,180,000
Fair value, asset	46,000	61,000
Not Subject to Master Netting Arrangements [Member]
Derivatives, Fair Value [Line Items]
Notional amount	2,174,075,000	1,864,875,000
Fair value, asset	31,550,000	32,183,000
Liability	14,374,000	12,050,000
Not Subject to Master Netting Arrangements [Member] | Interest Rate Lock Commitments [Member]
Derivatives, Fair Value [Line Items]
Notional amount	76,087,000
Fair value, asset	1,252,000
Liability	26,000
Not Subject to Master Netting Arrangements [Member] | Forward Delivery Commitments [Member]
Derivatives, Fair Value [Line Items]
Notional amount	85,065,000
Fair value, asset	20,000
Liability	376,000
Not Subject to Master Netting Arrangements [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Notional amount	1,825,706,000	1,689,157,000
Fair value, asset	30,263,000	32,170,000
Liability	13,820,000	11,866,000
Not Subject to Master Netting Arrangements [Member] | Equity Contracts [Member]
Derivatives, Fair Value [Line Items]
Notional amount	1,180,000	1,180,000
Liability	46,000	61,000
Not Subject to Master Netting Arrangements [Member] | Credit Risk Contracts [Member]
Derivatives, Fair Value [Line Items]
Notional amount	186,037,000	174,538,000
Fair value, asset	15,000	13,000
Liability	$ 106,000	$ 123,000

Derivative Instruments and He85

Derivative Instruments and Hedging Activities - Summary of Key Data Related to Interest Rate (Detail) - USD ($)	Mar. 31, 2017	Dec. 31, 2016
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	$ 4,655,961,000	$ 4,005,212,000
Fair value included in other assets	32,991,000	54,220,000
Fair value included in other liabilities	29,834,000	47,267,000
Designated as Hedging Instrument [Member] | Interest Rate Contracts [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	655,000,000	450,000,000
Fair value included in other liabilities	1,494,000	1,171,000
Designated as Hedging Instrument [Member] | Not for Trading Assets [Member] | Interest Rate Contracts [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Fair value included in other assets	603,000	9,256,000
Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	3,651,412,000	3,378,314,000
Not Designated as Hedging Instrument [Member] | Trading Liabilities [Member] | Interest Rate Swap [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Fair value included in other liabilities	27,786,000	45,912,000
Not Designated as Hedging Instrument [Member] | Trading Assets [Member] | Interest Rate Swap [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Fair value included in other assets	$ 31,055,000	$ 44,890,000

Derivative Instrument and Hedgi

Derivative Instrument and Hedging Activities - Summary of Amounts Reclassified from Accumulated Other Comprehensive Income (AOCI) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Reclassified from AOCI to interest expense	$ 21,941	$ 15,400
Reclassification out of Accumulated Other Comprehensive Income [Member] | Total [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Reclassified from AOCI to interest income	506
Reclassified from AOCI to interest expense	148
Reclassification out of Accumulated Other Comprehensive Income [Member] | Net of Tax [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Reclassified from AOCI to interest income	329
Reclassified from AOCI to interest expense	$ 96

Derivative Instruments and He87

Derivative Instruments and Hedging Activities - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Derivative [Line Items]
Notional amount	$ 4,655,961,000		$ 4,005,212,000
Additional amount in excess of posted collateral required in case of breached agreements	$ 800,000		1,100,000
Minimum [Member] | Interest Rate Lock Commitments [Member]
Derivative [Line Items]
Lock in period for interest rates	30 days
Maximum [Member] | Interest Rate Lock Commitments [Member]
Derivative [Line Items]
Lock in period for interest rates	90 days
Interest Rate Contracts [Member]
Derivative [Line Items]
Period to reclassification of cash flow hedge gain loss	12 months
Maximum length of time hedged in interest rate cash flow hedge	6 years
Derivative gains to be reclassified within twelve months	$ 128,000
Derivative gains to be reclassified within twelve months, net of tax	82,000
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
Credit Risk Contract Sold [Member]
Derivative [Line Items]
Notional amount	133,900,000
Maximum exposure under credit risk agreement assuming customer default	$ 105,000		$ 123,000
Credit Risk Contract Sold [Member] | Minimum [Member]
Derivative [Line Items]
Risk participation agreements, term	8 months
Credit Risk Contract Sold [Member] | Maximum [Member]
Derivative [Line Items]
Risk participation agreements, term	13 years

Derivative Instruments and He88

Derivative Instruments and Hedging Activities - Offsetting of Derivative Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Gross Amount	$ 32,991	$ 54,220
Gross Amounts Offset in the Balance Sheet, Derivative Assets	0	0
Net Amount Presented in the Balance Sheet	32,991	54,220
Interest Rate Lock Commitments [Member]
Derivatives, Fair Value [Line Items]
Gross Amount	1,252
Gross Amounts Offset in the Balance Sheet, Derivative Assets	0
Net Amount Presented in the Balance Sheet	1,252
Forward Delivery Commitments [Member]
Derivatives, Fair Value [Line Items]
Gross Amount	20
Gross Amounts Offset in the Balance Sheet, Derivative Assets	0
Net Amount Presented in the Balance Sheet	20
Credit Risk Contracts [Member]
Derivatives, Fair Value [Line Items]
Gross Amount	15	13
Gross Amounts Offset in the Balance Sheet, Derivative Assets	0	0
Net Amount Presented in the Balance Sheet	15	13
Subject to Master Netting Arrangements [Member]
Derivatives, Fair Value [Line Items]
Net Amount Presented in the Balance Sheet	1,441	22,037
Subject to Master Netting Arrangements [Member] | Interest Rate Contracts [Member]
Derivatives, Fair Value [Line Items]
Gross Amount	603	9,256
Gross Amounts Offset in the Balance Sheet, Derivative Assets	0	0
Net Amount Presented in the Balance Sheet	603	9,256
Subject to Master Netting Arrangements [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Gross Amount	792	12,720
Gross Amounts Offset in the Balance Sheet, Derivative Assets	0	0
Net Amount Presented in the Balance Sheet	792	12,720
Subject to Master Netting Arrangements [Member] | Equity Contracts [Member]
Derivatives, Fair Value [Line Items]
Gross Amount	46	61
Gross Amounts Offset in the Balance Sheet, Derivative Assets	0	0
Net Amount Presented in the Balance Sheet	46	61
Not Subject to Master Netting Arrangements [Member]
Derivatives, Fair Value [Line Items]
Net Amount Presented in the Balance Sheet	31,550	32,183
Not Subject to Master Netting Arrangements [Member] | Interest Rate Lock Commitments [Member]
Derivatives, Fair Value [Line Items]
Net Amount Presented in the Balance Sheet	1,252
Not Subject to Master Netting Arrangements [Member] | Forward Delivery Commitments [Member]
Derivatives, Fair Value [Line Items]
Net Amount Presented in the Balance Sheet	20
Not Subject to Master Netting Arrangements [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Gross Amount	30,263	32,170
Gross Amounts Offset in the Balance Sheet, Derivative Assets	0	0
Net Amount Presented in the Balance Sheet	30,263	32,170
Not Subject to Master Netting Arrangements [Member] | Credit Risk Contracts [Member]
Derivatives, Fair Value [Line Items]
Net Amount Presented in the Balance Sheet	$ 15	$ 13

Derivative Instruments and He89

Derivative Instruments and Hedging Activities - Offsetting of Derivative Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Gross Amount	$ 29,834	$ 47,267
Gross Amounts Offset in the Balance Sheet, Derivative Liabilities	0	0
Net Amount Presented in the Balance Sheet	29,834	47,267
Subject to Master Netting Arrangements [Member]
Derivatives, Fair Value [Line Items]
Net Amount Presented in the Balance Sheet	15,460	35,217
Subject to Master Netting Arrangements [Member] | Interest Rate Contracts [Member]
Derivatives, Fair Value [Line Items]
Gross Amount	1,494	1,171
Gross Amounts Offset in the Balance Sheet, Derivative Liabilities	0	0
Net Amount Presented in the Balance Sheet	1,494	1,171
Subject to Master Netting Arrangements [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Gross Amount	13,966	34,046
Gross Amounts Offset in the Balance Sheet, Derivative Liabilities	0	0
Net Amount Presented in the Balance Sheet	13,966	34,046
Not Subject to Master Netting Arrangements [Member]
Derivatives, Fair Value [Line Items]
Net Amount Presented in the Balance Sheet	14,374	12,050
Not Subject to Master Netting Arrangements [Member] | Interest Rate Lock Commitments [Member]
Derivatives, Fair Value [Line Items]
Gross Amount	26
Gross Amounts Offset in the Balance Sheet, Derivative Liabilities	0
Net Amount Presented in the Balance Sheet	26
Not Subject to Master Netting Arrangements [Member] | Forward Delivery Commitments [Member]
Derivatives, Fair Value [Line Items]
Gross Amount	376
Gross Amounts Offset in the Balance Sheet, Derivative Liabilities	0
Net Amount Presented in the Balance Sheet	376
Not Subject to Master Netting Arrangements [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Gross Amount	13,820	11,866
Gross Amounts Offset in the Balance Sheet, Derivative Liabilities	0	0
Net Amount Presented in the Balance Sheet	13,820	11,866
Not Subject to Master Netting Arrangements [Member] | Credit Risk Contracts [Member]
Derivatives, Fair Value [Line Items]
Gross Amount	106	123
Gross Amounts Offset in the Balance Sheet, Derivative Liabilities	0	0
Net Amount Presented in the Balance Sheet	106	123
Not Subject to Master Netting Arrangements [Member] | Equity Contracts [Member]
Derivatives, Fair Value [Line Items]
Gross Amount	46	61
Gross Amounts Offset in the Balance Sheet, Derivative Liabilities	0	0
Net Amount Presented in the Balance Sheet	$ 46	$ 61

Derivative Instruments and He90

Derivative Instruments and Hedging Activities - Derivative Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Net Amount Presented in the Balance Sheet	$ 32,991	$ 54,220
Subject to Master Netting Arrangements [Member]
Derivative [Line Items]
Net Amount Presented in the Balance Sheet	1,441	22,037
Gross Amounts Not Offset in the Balance Sheet Financial Instruments, Derivative Assets	1,329	1,378
Gross Amounts Not Offset in the Balance Sheet Cash Collateral Received, Derivative Assets		20,545
Net Amount, Derivative Assets	112	114
Subject to Master Netting Arrangements [Member] | Interest Rate Contracts [Member]
Derivative [Line Items]
Net Amount Presented in the Balance Sheet	603	9,256
Gross Amounts Not Offset in the Balance Sheet Financial Instruments, Derivative Assets	603	843
Gross Amounts Not Offset in the Balance Sheet Cash Collateral Received, Derivative Assets		8,413
Subject to Master Netting Arrangements [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Net Amount Presented in the Balance Sheet	792	12,720
Gross Amounts Not Offset in the Balance Sheet Financial Instruments, Derivative Assets	680	474
Gross Amounts Not Offset in the Balance Sheet Cash Collateral Received, Derivative Assets		12,132
Net Amount, Derivative Assets	112	114
Subject to Master Netting Arrangements [Member] | Equity Contracts [Member]
Derivative [Line Items]
Net Amount Presented in the Balance Sheet	46	61
Gross Amounts Not Offset in the Balance Sheet Financial Instruments, Derivative Assets	$ 46	$ 61

Derivative Instruments and He91

Derivative Instruments and Hedging Activities - Derivative Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Net Amount Presented in the Balance Sheet	$ 29,834	$ 47,267
Subject to Master Netting Arrangements [Member]
Derivative [Line Items]
Net Amount Presented in the Balance Sheet	15,460	35,217
Gross Amount Not Offset in the Balance Sheet Financial Instruments, Derivative Liabilities	14,702	16,661
Gross Amount Not Offset in the Balance Sheet Cash Collateral Pledged, Derivative Liabilities		17,651
Net Amount, Derivative Liabilities	758	905
Subject to Master Netting Arrangements [Member] | Interest Rate Contracts [Member]
Derivative [Line Items]
Net Amount Presented in the Balance Sheet	1,494	1,171
Gross Amount Not Offset in the Balance Sheet Financial Instruments, Derivative Liabilities	1,494	1,171
Subject to Master Netting Arrangements [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Net Amount Presented in the Balance Sheet	13,966	34,046
Gross Amount Not Offset in the Balance Sheet Financial Instruments, Derivative Liabilities	13,208	15,490
Gross Amount Not Offset in the Balance Sheet Cash Collateral Pledged, Derivative Liabilities		17,651
Net Amount, Derivative Liabilities	$ 758	$ 905

Derivative Instruments and He92

Derivative Instruments and Hedging Activities - Effect of Derivative Financial Instruments on Income Statement (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Interest Rate Contracts [Member] | Interest Income - Loans and Leases [Member]
Derivative [Line Items]
Derivative financial instrument, net	$ 506	$ 687
Interest Rate Contracts [Member] | Interest Expense - Short-term Borrowings [Member]
Derivative [Line Items]
Derivative financial instrument, net	148	150
Interest Rate Swap [Member] | Other Income [Member]
Derivative [Line Items]
Derivative financial instrument, net	(219)	(41)
Credit Risk Contracts [Member] | Other Income [Member]
Derivative [Line Items]
Derivative financial instrument, net	$ 19	$ (71)

Commitments, Credit Risk and 93

Commitments, Credit Risk and Contingencies - Summary of Off-Balance Sheet Credit Risk Information (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Commitments to Extend Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Extended credit and standby letters of credit	$ 6,278,542	$ 4,424,834
Standby Letters of Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Extended credit and standby letters of credit	$ 135,120	$ 117,732

Commitments, Credit Risk and 94

Commitments, Credit Risk and Contingencies - Additional Information (Detail)	Mar. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Percentage of Commitments to extend credit dependent upon the financial condition of the customers	69.50%

Stock Incentive Plans - Additio

Stock Incentive Plans - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2013	Mar. 11, 2017	Apr. 06, 2013	Jun. 16, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares available under incentive compensation plans	2,997,769
Unrecognized compensation expense	$ 8,278
Intrinsic value of outstanding and exercisable stock options	$ 6,000
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	$ 3.12
Warrant issued	342,564
Warrants converted to purchase common stock	392,475
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense	$ 8,300
Amount subject to accelerated vesting under Incentive Compensation Plan	$ 400
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		3 years
Unrecognized compensation expense	$ 3,784
Performance-Based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of awards issued, years	3 years		4 years
Restricted stock awards issued	0	0
Unrecognized compensation expense	$ 4,494
Performance-Based Awards [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock percentage of number of units issued	175.00%
Performance-Based Awards [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock percentage of number of units issued	0.00%
Discretionary Service Based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of awards issued, years			5 years
Warrant Expires in 2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrant issued, exercise price	$ 11.52
Warrant Expires in 2019 [Member] | Annapolis Bancorp, Inc. [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrant issued, exercise price					$ 3.57
Warrant Expires in 2019 [Member] | Yadkin Financial Corporation (YDKN) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrant issued, exercise price				$ 9.63
Warrant issued				207,320
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 Activity Relating to Restricted Stock Awards (Detail) - $ / shares	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Shares, Unvested awards outstanding at beginning of period	1,836,363	1,548,444
Shares, Vested	(243,982)	(363,799)
Shares, Forfeited	(2,950)	(6,368)
Shares, Dividend reinvestment	12,253	10,870
Shares, Unvested awards outstanding at end of period	1,601,684	1,189,147
Weighted Average Grant Price, Unvested awards outstanding at beginning of period	$ 12.97	$ 12.85
Weighted Average Grant Price, Vested	11.83	12.07
Weighted Average Grant Price, Forfeited	13	12.79
Weighted Average Grant Price, Dividend reinvestment	14.54	11.50
Weighted Average Grant Price, Unvested awards outstanding at end of period	$ 13.16	$ 13.08

Stock Incentive Plans - Schedul

Stock Incentive Plans - Schedule of Certain Information Related to Restricted Stock Awards (Detail) - Restricted Stock [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 1,760	$ 1,136
Tax benefit related to stock-based compensation expense	616	398
Fair value of awards vested	$ 3,802	$ 4,424

Stock Incentive Plans - Compone

Stock Incentive Plans - Components of Restricted Stock Awards (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested restricted stock awards	1,601,684	1,836,363	1,189,147	1,548,444
Unrecognized compensation expense	$ 8,278
Intrinsic value	$ 23,817
Weighted average remaining life (in years)	1 year 9 months
Service-Based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested restricted stock awards	830,140
Unrecognized compensation expense	$ 3,784
Intrinsic value	$ 12,344
Weighted average remaining life (in years)	1 year 8 months 19 days
Performance-Based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested restricted stock awards	771,544
Unrecognized compensation expense	$ 4,494
Intrinsic value	$ 11,473
Weighted average remaining life (in years)	1 year 9 months 7 days

Stock Incentive Plans - Summa99

Stock Incentive Plans - Summary of Activity Relating to Stock Options Awards (Detail) - $ / shares	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Shares, Options outstanding at beginning of period	892,532	435,340
Shares, Assumed from acquisitions	207,645	1,707,036
Shares, Exercised	(131,792)	(24,806)
Shares, Forfeited	(49,281)	(92,650)
Shares, Options outstanding and exercisable at end of period	919,104	2,024,920
Weighted Average Exercise Price, Options outstanding at beginning of period	$ 8.95	$ 8.86
Weighted Average Exercise Price, Assumed from acquisitions	8.92	7.83
Weighted Average Exercise Price, Exercised	9.44	6.38
Weighted Average Exercise Price, Forfeited	10.91	6.69
Weighted Average Exercise Price, Options outstanding and exercisable at end of period	$ 8.77	$ 8.12

Retirement Plans - Additional I

Retirement Plans - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2017
Retirement Plans Disclosure [Abstract]
Percent of employer match	100.00%
Employee contribution percentage	6.00%
Additional discretionary contribution, annual financial goals, percentage	3.00%

Retirement Plans - Schedule of

Retirement Plans - Schedule of Contribution Expense (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]
401(k) contribution expense	$ 2,767	$ 2,462

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, 2017	Mar. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ (4)	$ (4)
Interest cost	1,477	1,544
Expected return on plan assets	(2,427)	(2,353)
Amortization:
Unrecognized prior service cost	2	2
Unrecognized loss	628	608
Net periodic pension credit	$ (324)	$ (203)

Other Comprehensive Income - Ch

Other Comprehensive Income - Changes in AOCI, Net of Tax, by Component (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), balance at beginning of period	$ (61,369)
Other comprehensive income before reclassifications	5,420
Amounts reclassified from AOCI	(1,020)
Net current period other comprehensive income	4,400	$ 17,482
Accumulated other comprehensive income (loss), balance at end of period	(56,969)
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	(18,222)
Other comprehensive income before reclassifications	6,032
Amounts reclassified from AOCI	(787)
Net current period other comprehensive income	5,245
Accumulated other comprehensive income (loss), balance at end of period	(12,977)
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	5,254
Other comprehensive income before reclassifications	(1,022)
Amounts reclassified from AOCI	(233)
Net current period other comprehensive income	(1,255)
Accumulated other comprehensive income (loss), balance at end of period	3,999
Unrecognized Pension and Postretirement Obligations [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), balance at beginning of period	(48,401)
Other comprehensive income before reclassifications	410
Net current period other comprehensive income	410
Accumulated other comprehensive income (loss), balance at end of period	$ (47,991)

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, 2017	Mar. 31, 2016
Earnings Per Share [Abstract]
Net income	$ 22,979	$ 26,132
Less: Preferred stock dividends	2,010	2,010
Net income available to common stockholders	$ 20,969	$ 24,122
Basic weighted average common shares outstanding	237,379,260	193,585,702
Net effect of dilutive stock options, warrants and restricted stock	1,875,389	1,292,220
Diluted weighted average common shares outstanding	239,254,649	194,877,922
Basic	$ 0.09	$ 0.12
Diluted	$ 0.09	$ 0.12

Earnings Per Common Share - Sch

Earnings Per Common Share - Schedule of Average Shares Excluded from Diluted Earnings Per Common Share Calculation (Detail) - shares	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Earnings Per Share [Abstract]
Average shares excluded from the diluted earnings per common share calculation	81,755	15,501

Cash Flow Information - Summary

Cash Flow Information - Summary of Supplemental Cash Flow Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Cash Flows [Abstract]
Interest paid on deposits and other borrowings	$ 18,606	$ 13,794
Income taxes paid	0	0
Transfers of loans to other real estate owned	$ 20,517	8,049
Financing of other real estate owned sold		$ 62

Business Segments - Additional

Business Segments - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2017Segment
Segment Reporting [Abstract]
Number of reportable segments	4

Business Segments - Financial I

Business Segments - Financial Information for Segments of FNB (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Interest income		$ 194,693	$ 155,754
Interest expense		21,941	15,400
Net interest income		172,752	140,354
Provision for credit losses		10,850	11,768
Non-interest income		55,116	46,044
Non-interest expense	[1]	184,457	133,999
Amortization of intangibles		3,098	2,649
Income tax expense (benefit)		6,484	11,850
Net income (loss)		22,979	26,132
Total assets		30,190,695	20,324,524	$ 21,844,817
Total intangibles		2,385,004	1,087,050
Operating Segments [Member] | Community Banking [Member]
Segment Reporting Information [Line Items]
Interest income		182,358	143,978
Interest expense		18,865	12,594
Net interest income		163,493	131,384
Provision for credit losses		8,198	9,917
Non-interest income		41,384	31,233
Non-interest expense	[1]	167,393	118,048
Amortization of intangibles		2,982	2,441
Income tax expense (benefit)		6,148	10,117
Net income (loss)		20,156	22,094
Total assets		30,007,404	20,151,815
Total intangibles		2,360,557	1,062,079
Operating Segments [Member] | Wealth Management [Member]
Segment Reporting Information [Line Items]
Non-interest income		9,549	8,816
Non-interest expense	[1]	7,540	7,089
Amortization of intangibles		61	65
Income tax expense (benefit)		711	605
Net income (loss)		1,237	1,057
Total assets		22,130	20,540
Total intangibles		10,353	10,383
Operating Segments [Member] | Insurance [Member]
Segment Reporting Information [Line Items]
Interest income		20	22
Net interest income		20	22
Non-interest income		4,325	4,194
Non-interest expense	[1]	3,315	3,301
Amortization of intangibles		55	143
Income tax expense (benefit)		347	275
Net income (loss)		628	497
Total assets		20,514	21,680
Total intangibles		12,285	12,779
Operating Segments [Member] | Consumer Finance [Member]
Segment Reporting Information [Line Items]
Interest income		9,902	9,785
Interest expense		922	941
Net interest income		8,980	8,844
Provision for credit losses		1,786	1,526
Non-interest income		710	716
Non-interest expense	[1]	5,231	5,204
Income tax expense (benefit)		1,067	1,112
Net income (loss)		1,606	1,718
Total assets		184,006	188,547
Total intangibles		1,809	1,809
Parent and Other [Member]
Segment Reporting Information [Line Items]
Interest income		2,413	1,969
Interest expense		2,154	1,865
Net interest income		259	104
Provision for credit losses		866	325
Non-interest income		(852)	1,085
Non-interest expense	[1]	978	357
Income tax expense (benefit)		(1,789)	(259)
Net income (loss)		(648)	766
Total assets		$ (43,359)	$ (58,058)
[1]	Excludes amortization of intangibles, which is presented separately.

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Fair Value Measurements Disclosure [Line Items]
Percentage of securities using market-based information	99.50%
Percentage of securities using model-based techniques	0.50%
Minimum reserves for commercial loan	$ 500,000
Impaired loans, carrying amount	95,374,000		$ 81,853,000
Allocated allowance for loan losses	7,200,000
Fair value of allocated allowance	8,800,000
Estimated costs to sell	200,000
Provision for fair value measurements included in allowance for loan losses	6,400,000
Carrying amount of OREO	2,000,000
Written down of OREO	1,600,000
Fair value of OREO	1,800,000
Estimated cost to sell OREO	200,000
Loss from OREO included in earnings	$ 400,000
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	$ 15,700,000
Allocated allowance for loan losses	8,765,000		6,383,000
Fair value of OREO	1,842,000		$ 14,198,000
Equity Securities [Member]
Fair Value Measurements Disclosure [Line Items]
Transfer of equity security to non-marketable equity securities, included in other assets	600,000
Other Debt Securities [Member] | Yadkin Financial Corporation (YDKN) [Member]
Fair Value Measurements Disclosure [Line Items]
Business acquisition	12,000,000
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, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets Measured at Fair Value, Securities available for sale		$ 2,638,815	$ 2,231,987
Loans held for sale	[1]	11,121	0
Derivative assets		32,991	54,220
Derivative financial instruments		29,834	47,267
U.S. Treasury [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets Measured at Fair Value, Debt securities available for sale		29,945	29,953
U.S. Government-Sponsored Entities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets Measured at Fair Value, Debt securities available for sale		395,206	365,098
Agency Collateralized Mortgage Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets Measured at Fair Value, Debt securities available for sale		503,963	535,974
Assets Measured at Fair Value, Securities available for sale		503,963
Non-Agency Collateralized Mortgage Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets Measured at Fair Value, Debt securities available for sale		2	897
Assets Measured at Fair Value, Securities available for sale		2
Commercial Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets Measured at Fair Value, Debt securities available for sale		419	1,291
Assets Measured at Fair Value, Securities available for sale		419
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, Debt securities available for sale		34,678	35,849
Other Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets Measured at Fair Value, Debt securities available for sale		21,594	9,487
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets Measured at Fair Value, Securities available for sale		3,881	148
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets Measured at Fair Value, Securities available for sale		2,622,887	2,230,453
Derivative assets		31,739	54,220
Derivative financial instruments		29,834	47,267
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets Measured at Fair Value, Securities available for sale		12,047	1,386
Derivative assets		1,252
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets Measured at Fair Value, Debt securities available for sale		2,628,821	2,231,347
Assets Measured at Fair Value, Equity securities available for sale		9,994	640
Assets Measured at Fair Value, Securities available for sale		2,638,815	2,231,987
Loans held for sale		11,121
Derivative assets		32,991	54,220
Assets measured at fair value on a recurring basis, Total		2,682,927	2,286,207
Derivative financial instruments		29,834	47,267
Liabilities measured at fair value on a recurring basis, Total		29,834	47,267
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, Debt securities available for sale		29,945	29,953
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, Debt securities available for sale		395,206	365,098
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, Debt securities available for sale		503,963	535,974
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, Debt securities available for sale		2	897
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, Debt securities available for sale		419	1,291
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, Debt securities available for sale		34,678	35,849
Fair Value, Measurements, Recurring [Member] | Other Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets Measured at Fair Value, Debt securities available for sale		21,594	9,487
Fair Value, Measurements, Recurring [Member] | Trading Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		31,101	44,951
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		1,890	9,269
Fair Value, Measurements, Recurring [Member] | Fixed Income Mutual Fund [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets Measured at Fair Value, Equity securities available for sale		9,076
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, Equity securities available for sale		760	492
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, Equity securities available for sale		158	148
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, Debt securities available for sale		1,643,014	1,252,798
Fair Value, Measurements, Recurring [Member] | Trading Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments		27,832	45,973
Fair Value, Measurements, Recurring [Member] | Not for Trading Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative financial instruments		2,002	1,294
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, Equity securities available for sale		3,881	148
Assets Measured at Fair Value, Securities available for sale		3,881	148
Assets measured at fair value on a recurring basis, Total		3,881	148
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Fixed Income Mutual Fund [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets Measured at Fair Value, Equity securities available for sale		3,723
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, Equity securities available for sale		158	148
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, Debt securities available for sale		2,616,774	2,230,453
Assets Measured at Fair Value, Equity securities available for sale		6,113
Assets Measured at Fair Value, Securities available for sale		2,622,887	2,230,453
Loans held for sale		11,121
Derivative assets		31,739	54,220
Assets measured at fair value on a recurring basis, Total		2,665,747	2,284,673
Derivative financial instruments		29,834	47,267
Liabilities measured at fair value on a recurring basis, Total		29,834	47,267
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, Debt securities available for sale		29,945	29,953
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, Debt securities available for sale		395,206	365,098
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, Debt securities available for sale		503,963	535,974
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, Debt securities available for sale		2	3
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, Debt securities available for sale		419	1,291
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, Debt securities available for sale		34,678	35,849
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Other Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets Measured at Fair Value, Debt securities available for sale		9,547	9,487
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		31,101	44,951
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		638	9,269
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Fixed Income Mutual Fund [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets Measured at Fair Value, Equity securities available for sale		5,353
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, Equity securities available for sale		760
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, Debt securities available for sale		1,643,014	1,252,798
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 financial instruments		27,832	45,973
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 financial instruments		2,002	1,294
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, Debt securities available for sale		12,047	894
Assets Measured at Fair Value, Equity securities available for sale			492
Assets Measured at Fair Value, Securities available for sale		12,047	1,386
Derivative assets		1,252
Assets measured at fair value on a recurring basis, Total		13,299	1,386
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, Debt securities available for sale			894
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Other Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets Measured at Fair Value, Debt securities available for sale		12,047
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Not for Trading Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		$ 1,252
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, Equity securities available for sale			$ 492
[1]	Amount represents loans for which we have elected the fair value option. See Note 17.

Fair Value Measurements - Ad111

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, 2017	Dec. 31, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	$ 1,386	$ 1,623
Total gains (losses) - realized/unrealized, Included in earnings	4
Total gains (losses) - realized/unrealized, Included in other comprehensive income	80	46
Accretion included in earnings		6
Purchases	12,048
Issuances	0	0
Sales/redemptions	(874)
Settlements	(19)	(289)
Transfers from Level 3	(578)
Transfers into Level 3	1,252
Balance at end of period	13,299	1,386
Other Debt Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Accretion included in earnings	(1)
Purchases	12,048
Issuances	0	0
Balance at end of period	12,047
Equity Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	492	439
Total gains (losses) - realized/unrealized, Included in other comprehensive income	86	53
Issuances	0	0
Transfers from Level 3	(578)
Balance at end of period		492
Residential Non-Agency Collateralized Mortgage Obligations [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	894	1,184
Total gains (losses) - realized/unrealized, Included in earnings	4
Total gains (losses) - realized/unrealized, Included in other comprehensive income	(6)	(7)
Accretion included in earnings	1	6
Issuances	0	0
Sales/redemptions	(874)
Settlements	(19)	(289)
Balance at end of period		894
Interest Rate Lock Commitments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Issuances	0	$ 0
Transfers into Level 3	1,252
Balance at end of period	$ 1,252

Fair Value Measurements - Ad112

Fair Value Measurements - Additional Information about Assets Measured at Fair Value on Non-Recurring Basis (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	$ 7,200
Other real estate owned	1,800
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	8,765	$ 6,383
Other real estate owned	1,842	14,198
Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	1,812	500
Other real estate owned	643	11,017
Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	6,953	5,883
Other real estate owned	$ 1,199	$ 3,181

Fair Value Measurements - Fair

Fair Value Measurements - Fair Values of Corporation's Financial Instruments (Detail) - USD ($) $ in Thousands		Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents		$ 450,383	$ 371,407	$ 345,945	$ 489,119
Securities available for sale		2,638,815	2,231,987
Securities held to maturity		2,922,152	2,337,342
Securities held to maturity		2,886,897	2,294,777
Derivative assets		32,991	54,220
Deposits		21,326,272	16,065,647
Short-term borrowings		3,585,963	2,503,010
Long-term borrowings		696,206	539,494
Derivative liabilities		29,834	47,267
Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents		450,383	371,407
Securities available for sale		2,638,815	2,231,987
Securities held to maturity		2,922,152	2,337,342
Net loans and leases	[1]	20,092,138	14,750,792
Loan servicing rights		28,205	13,521
Derivative assets		32,991	54,220
Accrued interest receivable		77,638	58,712
Deposits		21,326,272	16,065,647
Short-term borrowings		3,585,963	2,503,010
Long-term borrowings		696,206	539,494
Derivative liabilities		29,834	47,267
Accrued interest payable		10,947	7,612
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents		450,383	371,407
Securities available for sale		2,638,815	2,231,987
Securities held to maturity		2,886,897	2,294,777
Net loans and leases	[1]	19,823,712	14,446,274
Loan servicing rights		32,301	17,546
Derivative assets		32,991	54,220
Accrued interest receivable		77,638	58,712
Deposits		21,298,707	16,045,323
Short-term borrowings		3,586,486	2,503,277
Long-term borrowings		688,209	536,088
Derivative liabilities		29,834	47,267
Accrued interest payable		10,947	7,612
Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents		450,383	371,407
Securities available for sale		3,881	148
Accrued interest receivable		77,638	58,712
Deposits		17,446,603	13,489,152
Short-term borrowings		3,586,486	2,503,277
Accrued interest payable		10,947	7,612
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available for sale		2,622,887	2,230,453
Securities held to maturity		2,886,897	2,293,091
Net loans and leases	[1]	11,121
Derivative assets		31,739	54,220
Deposits		3,852,104	2,556,171
Derivative liabilities		29,834	47,267
Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available for sale		12,047	1,386
Securities held to maturity			1,686
Net loans and leases	[1]	19,812,591	14,464,274
Loan servicing rights		32,301	17,546
Derivative assets		1,252
Long-term borrowings		$ 688,209	$ 536,088
[1]	Includes loans held for sale.