F.N.B. (FNB) 10-Q 10 May 18 2018 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2018	Apr. 30, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2,018
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		323,851,407

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands		Mar. 31, 2018	Dec. 31, 2017
Assets
Cash and due from banks		$ 325,101	$ 408,718
Interest bearing deposits with banks		61,228	70,725
Cash and Cash Equivalents		386,329	479,443
Securities available for sale		2,927,463	2,764,562
Debt securities held to maturity (fair value of $3,131,964 and $3,218,379)		3,224,000	3,242,268
Loans held for sale (includes $21,610 and $56,458 measured at fair value) (1)	[1]	37,982	92,891
Loans and leases, net of unearned income of $43,791 and $50,680		21,262,397	20,998,766
Allowance for credit losses		(179,247)	(175,380)
Net Loans and Leases		21,083,150	20,823,386
Premises and equipment, net		333,424	336,540
Goodwill		2,251,281	2,249,188
Core deposit and other intangible assets, net		87,858	92,075
Bank owned life insurance		529,843	526,818
Other assets		791,023	810,464
Total Assets		31,652,353	31,417,635
Liabilities
Non-interest-bearing demand		5,748,568	5,720,030
Interest-bearing demand		9,407,111	9,571,038
Savings		2,600,151	2,488,178
Certificates and other time deposits		4,741,259	4,620,479
Total Deposits		22,497,089	22,399,725
Short-term borrowings		3,802,480	3,678,337
Long-term borrowings		659,890	668,173
Other liabilities		259,441	262,206
Total Liabilities		27,218,900	27,008,441
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 - 325,319,503 and 325,095,055 shares		3,255	3,253
Additional paid-in capital		4,037,847	4,033,567
Retained earnings		413,340	367,658
Accumulated other comprehensive loss		(108,724)	(83,052)
Treasury stock – 1,632,510 and 1,629,915 shares at cost		(19,147)	(19,114)
Total Stockholders’ Equity		4,433,453	4,409,194
Total Liabilities and Stockholders’ Equity		$ 31,652,353	$ 31,417,635
[1]	Amount represents loans for which we have elected the fair value option. See Note 18.

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands		Mar. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Securities held to maturity, fair value		$ 3,131,964	$ 3,218,379
Loans held for sale, fair value	[1]	21,610	56,458
Unearned income on loans		$ 43,791	$ 50,680
Preferred stock, par value (in dollars per share)		$ 0.01	$ 0.01
Preferred stock, liquidation preference per share (in dollars 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 (in dollars per share)		$ 0.01	$ 0.01
Common stock, shares authorized		500,000,000	500,000,000
Common stock, shares issued		325,319,503	325,095,055
Treasury stock, shares		1,632,510	1,629,915
[1]	Amount represents loans for which we have elected the fair value option. See Note 18.

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Interest Income
Loans and leases, including fees	$ 239,094	$ 168,629
Securities:
Taxable	26,879	22,466
Tax-exempt	6,594	3,401
Dividends	0	9
Other	360	188
Total Interest Income	272,927	194,693
Interest Expense
Deposits	26,469	11,740
Short-term borrowings	15,207	6,674
Long-term borrowings	5,146	3,527
Total Interest Expense	46,822	21,941
Net Interest Income	226,105	172,752
Provision for credit losses	14,495	10,850
Net Interest Income After Provision for Credit Losses	211,610	161,902
Non-Interest Income
Service charges	30,077	24,581
Trust services	6,448	5,747
Insurance commissions and fees	5,135	5,141
Securities commissions and fees	4,319	3,623
Capital markets income	5,214	3,847
Mortgage banking operations	5,529	3,790
Bank owned life insurance	3,285	2,153
Net securities gains	0	2,625
Other	7,496	3,609
Total Non-Interest Income	67,503	55,116
Non-Interest Expense
Salaries and employee benefits	89,326	73,578
Net occupancy	15,568	11,349
Equipment	14,465	9,630
Amortization of intangibles	4,218	3,098
Outside services	14,725	13,043
FDIC insurance	8,834	5,387
Supplies	1,684	2,196
Bank shares and franchise taxes	3,452	2,980
Merger-related	0	52,724
Other	18,811	13,570
Total Non-Interest Expense	171,083	187,555
Income Before Income Taxes	108,030	29,463
Income taxes	21,268	6,484
Net Income	86,762	22,979
Preferred stock dividends	2,010	2,010
Net Income Available to Common Stockholders	$ 84,752	$ 20,969
Earnings per Common Share
Basic (in USD per share)	$ 0.26	$ 0.09
Diluted (in USD per share)	0.26	0.09
Cash Dividends per Common Share (in USD per share)	$ 0.12	$ 0.12

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 86,762	$ 22,979
Securities available for sale:
Unrealized (losses) gains arising during the period, net of tax (benefit) expense of $(8,467) and $3,248	(29,787)	6,032
Reclassification adjustment for gains included in net income, net of tax expense of $0 and $424	0	(787)
Derivative instruments:
Unrealized gains (losses) arising during the period, net of tax expense (benefit) of $1,082 and $(550)	3,804	(1,022)
Reclassification adjustment for gains included in net income, net of tax expense of $49 and $125	(173)	(233)
Pension and postretirement benefit obligations:
Unrealized (losses) gains arising during the period, net of tax (benefit) expense of $136 and $221	484	410
Other comprehensive (loss) income	(25,672)	4,400
Comprehensive income	$ 61,090	$ 27,379

Consolidated Statements of Com6

Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Unrealized gains arising during the period, tax expense	$ (8,467)	$ 3,248
Reclassification adjustment for gains included in net income, tax expense	0	424
Unrealized (losses) gains arising during the period, tax (benefit) expense	1,082	(550)
Reclassification adjustment for gains included in net income, tax expense	49	125
Unrealized gains arising during the period, tax expense	$ 136	$ 221

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]
Balance at beginning of period at Dec. 31, 2016	$ 2,571,617	$ 106,882	$ 2,125	$ 2,234,366	$ 304,397	$ (61,369)	$ (14,784)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
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
Restricted stock compensation	1,394			1,394
Tax benefit of stock-based compensation	1,759			1,759
Balance at end of period at Mar. 31, 2017	4,355,795	106,882	3,246	4,020,527	299,818	(56,969)	(17,709)
Balance at beginning of period at Dec. 31, 2017	4,409,194	106,882	3,253	4,033,567	367,658	(83,052)	(19,114)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income	61,090				86,762	(25,672)
Dividends declared:
Preferred stock	(2,010)				(2,010)
Common stock: $0.12/share	(39,070)				(39,070)
Issuance of common stock	2,310		2	2,341			(33)
Restricted stock compensation	1,939			1,939
Balance at end of period at Mar. 31, 2018	$ 4,433,453	$ 106,882	$ 3,255	$ 4,037,847	$ 413,340	$ (108,724)	$ (19,147)

Consolidated Statements of Sto8

Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Stockholders' Equity [Abstract]
Common stock dividends per share (in USD per share)	$ 0.12	$ 0.12

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating Activities
Net income	$ 86,762	$ 22,979
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation, amortization and accretion	23,676	17,276
Provision for credit losses	14,495	10,850
Deferred tax expense	1,864	11,224
Net securities gains	0	(2,625)
Tax benefit of stock-based compensation	(233)	(720)
Loans originated for sale	(208,990)	(182,771)
Loans sold	269,235	135,405
Gain on sale of loans	(5,336)	(3,344)
Net change in:
Interest receivable	(828)	(1,527)
Interest payable	282	444
Bank owned life insurance	(3,093)	(1,962)
Other, net	32,559	13,403
Net cash flows provided by operating activities	210,393	18,632
Investing Activities
Net change in loans and leases	(284,196)	(208,958)
Securities available for sale:
Purchases	(357,784)	(492,227)
Sales	0	549,460
Maturities	153,401	119,867
Debt securities held to maturity:
Purchases	(63,918)	(531,560)
Sales	0	1,574
Maturities	80,492	119,324
Increase in premises and equipment	(9,347)	(23,186)
Net cash received in business combinations	0	197,682
Net cash flows used in investing activities	(481,352)	(268,024)
Financing Activities
Demand (non-interest bearing and interest bearing) and savings accounts	(23,416)	73,291
Time deposits	122,040	11,421
Short-term borrowings	124,143	286,765
Proceeds from issuance of long-term borrowings	10,122	65,998
Repayment of long-term borrowings	(18,213)	(82,506)
Net proceeds from issuance of common stock	4,249	957
Cash dividends paid:
Preferred stock	(2,010)	(2,010)
Common stock	(39,070)	(25,548)
Net cash flows provided by financing activities	177,845	328,368
Net Increase (Decrease) in Cash and Cash Equivalents	(93,114)	78,976
Cash and cash equivalents at beginning of period	479,443	371,407
Cash and Cash Equivalents at End of Period	$ 386,329	$ 450,383

NATURE OF OPERATIONS

NATURE OF OPERATIONS	3 Months Ended
	Mar. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
NATURE OF OPERATIONS	NATURE OF OPERATIONS F.N.B. Corporation, headquartered in Pittsburgh, Pennsylvania, is a diversified financial services company operating in eight states. Through FNBPA, we have over 150 years of serving the financial and banking needs of our customers. We hold a significant retail deposit market share in attractive markets including: Pittsburgh, Pennsylvania; Baltimore, Maryland; Cleveland, Ohio; and Charlotte, Raleigh-Durham and the Piedmont Triad (Winston-Salem, Greensboro and High Point) in North Carolina. As of March 31, 2018 , we had 417 banking offices throughout Pennsylvania, Ohio, Maryland, West Virginia, North Carolina and South Carolina. We provide a full range of commercial banking, consumer banking and wealth management solutions through our subsidiary network which is led by our largest affiliate, FNBPA. Commercial banking solutions include corporate banking, small business banking, investment real estate financing, business credit, capital markets and lease financing. Consumer banking provides a full line of consumer banking products and services including deposit products, mortgage lending, consumer lending and a complete suite of mobile and online banking services. Wealth management services include fiduciary and brokerage services, asset management, private banking and insurance. We also operate Regency Finance Company, which had 77 consumer finance offices in Pennsylvania, Ohio, Kentucky and Tennessee as of March 31, 2018 .

SUMMARY OF SIGNIFICANT ACCOUNTI

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	3 Months Ended
	Mar. 31, 2018
Accounting Policies [Abstract]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	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, 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. 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, 2018 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. 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 unaudited Consolidated Financial Statements should be read in conjunction with the audited Consolidated Financial Statements and Notes thereto included in FNB’s 2017 Annual Report on Form 10-K filed with the SEC on February 28, 2018 . For a detailed description of our significant accounting policies, see Note 1 "Summary of Significant Accounting Policies" in the 2017 Form 10-K. The accounting policies presented below have been added or amended for newly material items or the adoption of new accounting standards. 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, income taxes and deferred tax assets and litigation. Revenue from Contracts with Customers We earn certain revenues from contracts with customers. These revenues are recognized when control of the promised services is transferred to the customers in an amount that reflects the consideration we expect to be entitled to in an exchange for those services. In determining the appropriate revenue recognition for our contracts with customers, we consider whether the contract has commercial substance and is approved by both parties with identifiable contractual rights, payment terms, and the collectability of consideration is probable. Generally, we satisfy our performance obligations upon the completion of services at the amount to which we have the right to invoice or charge under contracts with an original expected duration of one year or less. We apply this guidance on a portfolio basis to contracts with similar characteristics and for which we believe the results would not differ materially from applying this guidance to individual contracts. Our services provided under contracts with customers are transferred at the point in time when the services are rendered. Generally, we do not defer incremental direct costs to obtain contracts with customers that would be amortized in one year or less under the practical expedient. These costs are recognized as expense, primarily salary and benefit expense, in the period incurred. Deposit Services . We recognize revenue on deposit services based on published fees for services provided. Demand and savings deposit customers have the right to cancel their depository arrangements and withdraw their deposited funds at any time without prior notice. When services involve deposited funds that can be retrieved by customers without penalties, we consider the service contract term to be day-to-day, where each day represents the renewal of the contract. The contract does not extend beyond the services performed and revenue is recognized at the end of the contract term (daily) as the performance obligation is satisfied. No deposit services fees exist for long-term deposit products beyond early withdrawal penalties, which are earned on these products at the time of early termination. Revenue from deposit services fees are reduced where we have a history of waived or reduced fees by customer request or due to a customer service issue, by historical experience, or another acceptable method in the same period as the related revenues. Revenues from deposit services are reported in the Consolidated Statements of Income as service charges and in the Community Banking segment as non-interest income. Wealth Management Services. Wealth advisory and trust services are provided on a month-to-month basis and invoiced as services are rendered. Fees are based on a fixed amount or a scale based on the level of services provided or assets under management. The customer has the right to terminate their services agreement at any time. We determine the value of services performed based on the fee schedule in effect at the time the services are performed. Revenues from wealth advisory and trust services are reported in the Consolidated Statements of Income as trust services and securities commissions and fees, and in the Wealth segment as non-interest income. Insurance Services. Insurance services include full-service insurance brokerage services offering numerous lines of commercial and personal insurance through major carriers to businesses and individuals within our geographic markets. We recognize revenue on insurance contracts in effect based on contractually specified commission payments on premiums that are paid by the customer to the insurance carrier. Contracts are cancellable at any time and we have no performance obligation to the customers beyond the time the insurance is placed into effect. Revenues from insurance services are reported in the Consolidated Statements of Income as insurance commissions and fees, and in the Insurance segment as non-interest income. Debt Securities Debt securities comprise a significant portion of our Consolidated Balance Sheets. Such securities can be classified as trading, HTM or AFS. As of March 31, 2018 and 2017 , we did not hold any trading debt securities. Debt securities HTM are the securities that management has the positive intent and ability to hold until their maturity. Such securities are carried at cost, adjusted for related amortization of premiums and accretion of discounts through interest income from securities, and subject to evaluation for OTTI. Debt securities that are not classified as trading or HTM are classified as AFS. Such securities are carried at fair value with net unrealized gains and losses deemed to be temporary and OTTI attributable to non-credit factors reported separately as a component of other comprehensive income, net of tax. We evaluate our debt securities in a loss position for OTTI on a quarterly basis at the individual security level based on our intent to sell. If we intend to sell the debt security or it is more likely than not we will be required to sell the security before recovery of its amortized cost basis, OTTI must be recognized in earnings equal to the entire difference between the investments’ amortized cost basis and its fair value. If we do not intend to sell the debt security and it is not more likely than not that we will be required to sell the security before recovery of its amortized cost basis, OTTI must be separated into the amount representing credit loss and the amount related to all other market factors. The amount related to credit loss will be recognized in earnings. The amount related to other market factors will be recognized in other comprehensive income, net of applicable taxes. We perform our OTTI evaluation process in a consistent and systematic manner and include an evaluation of all available evidence. This process considers factors such as length of time and anticipated recovery period of the impairment, recent events specific to the issuer and recent experience regarding principal and interest payments. Low Income Housing Tax Credit (LIHTC) Partnerships We invest in various affordable housing projects that qualify for LIHTCs. The net 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 $26.1 million and $20.9 million at March 31, 2018 and December 31, 2017 , respectively. Our unfunded commitments in LIHTCs were $60.1 million and $67.2 million at March 31, 2018 and December 31, 2017 , respectively.

NEW ACCOUNTING STANDARDS

NEW ACCOUNTING STANDARDS	3 Months Ended
	Mar. 31, 2018
Accounting Changes and Error Corrections [Abstract]
NEW ACCOUNTING STANDARDS	NEW ACCOUNTING STANDARDS The following table summarizes accounting pronouncements issued by the Financial Accounting Standards Board that we recently adopted or will be adopting in the future. Standard Description Required Date of Adoption Financial Statements Impact Derivative and Hedging Activities ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities This Update improves the financial reporting of hedging to better align with a company’s risk management activities. In addition, this Update makes certain targeted improvements to simplify the application of the current hedge accounting guidance. January 1, 2019 Early adoption is permitted. This Update is to be applied using a modified retrospective method. The presentation and disclosure guidance are applied prospectively. We are currently assessing the potential impact to our Consolidated Financial Statements. Securities ASU 2017-08, Receivables-Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities This Update shortens the amortization period for the premium on certain purchased callable securities to the earliest call date. The accounting for purchased callable debt securities held at a discount does not change. January 1, 2019 Early adoption is permitted. This Update is to be applied using a modified retrospective transition method. The adoption of this Update is not expected to have a material effect on our Consolidated Financial Statements. Standard Description Required Date of Adoption Financial Statements Impact Retirement Benefits ASU 2017-07, Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost This Update requires that an employer disaggregate the service cost component from the other components of net benefit cost. The amendments also provide explicit guidance on how to present the service cost component and the other components of net benefit cost in the income statement and allows only the service cost component of net benefit cost to be eligible for capitalization. January 1, 2018 We adopted this Update in the first quarter of 2018 by a retrospective transition method. The adoption of this Update did not have a material effect on our Consolidated Financial Statements. 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) This Update adds or clarifies guidance on eight cash flow issues. January 1, 2018 We adopted this Update in the first quarter of 2018 by retrospective application. The adoption of this Update did not have a material effect on our Consolidated Financial Statements. Credit Losses ASU 2016-13 , Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments This Update replaces the current incurred loss impairment methodology with a methodology that reflects current expected credit losses (commonly referred to as CECL) for most financial assets measured at amortized cost and certain other instruments, including loans, HTM debt securities, net investments in leases and off-balance sheet credit exposures. CECL requires loss estimates for the remaining life of the financial asset at the time the asset is originated or acquired, considering historical experience, current conditions and reasonable and supportable forecasts. In addition, the Update will require the use of a modified AFS debt security impairment model and eliminate the current accounting for purchased credit impaired loans and debt securities. January 1, 2020 Early adoption is permitted for fiscal years beginning after December 15, 2018 This Update is to be applied using a cumulative-effect adjustment to retained earnings. The CECL model is a significant change from existing GAAP and may result in a material change to our accounting for financial instruments. We are reviewing our business processes, information systems and controls to support recognition and disclosures under this Update. This review includes an assessment of our existing credit models and the financial statement disclosure requirements. The impact of this Update will be dependent on the portfolio composition, credit quality and economic conditions at the time of adoption. Extinguishments of Liabilities ASU 2016-04, Liabilities - Extinguishments of Liabilities (Subtopic 405-20): Recognition of Breakage for Certain Prepaid Stored-Value Products (a consensus of the Emerging Issues Task Force) This Update requires entities that sell prepaid stored-value products redeemable for goods, services or cash at third-party merchants to recognize breakage. January 1, 2018 We adopted this Update in the first quarter of 2018. The adoption of this Update did not have a material effect on our Consolidated Financial Statements. Standard Description Required Date of Adoption Financial Statements Impact Leases ASU 2016-02, Leases (Topic 842) This Update requires lessees to put most leases on their balance sheets but recognize expenses in the income statement similar to current accounting. In addition, the Update changes the guidance for sale-leaseback transactions, initial direct costs and lease executory costs for most entities. All entities will classify leases to determine how to recognize lease related revenue and expense. January 1, 2019 Early adoption is permitted. This Update is to be applied using a modified retrospective application including a number of optional practical expedients. We are in the process of reviewing our existing lease portfolios, implementing a software solution and assessing the potential impact to our Consolidated Financial Statements. Financial Instruments – Recognition and Measurement ASU 2016-01, Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities This Update amends the presentation and accounting for certain financial instruments, including liabilities measured at fair value under the FVO, and equity investments. The guidance also updates fair value presentation and disclosure requirements for financial instruments measured at amortized cost. January 1, 2018 We adopted this Update in the first quarter of 2018 by a cumulative-effect adjustment. The adoption of this Update did not have a material effect on our Consolidated Financial Statements. During the first quarter of 2018, we transferred marketable equity securities totaling $1.1 million from securities AFS to other assets. Revenue Recognition ASU 2014-09, Revenue from Contracts with Customers (Topic 606) This Update modifies the guidance used to recognize revenue from contracts with customers for transfers of goods and services and transfers of nonfinancial assets, unless those contracts are within the scope of other guidance. The guidance also requires new qualitative and quantitative disclosures about contract balances and performance obligations. January 1, 2018 We adopted this Update in the first quarter of 2018 under the modified retrospective method. The adoption of this Update did not have a material effect on our Consolidated Financial Statements.

MERGERS AND ACQUISITIONS

MERGERS AND ACQUISITIONS	3 Months Ended
	Mar. 31, 2018
Business Combinations [Abstract]
MERGERS AND ACQUISITIONS	MERGERS AND ACQUISITIONS Yadkin Financial Corporation On March 11, 2017, we completed our acquisition of YDKN, a bank holding company based in Raleigh, North Carolina. YDKN’s banking affiliate, Yadkin Bank, was 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 several 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 first quarter of 2017. On the acquisition date, the fair values of YDKN included $6.8 billion in assets, of which there was $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 111,619,622 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 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 UST under the Capital Purchase Program. 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, 2018 , all fair values and related adjustments to goodwill have been recorded.

SECURITIES

SECURITIES	3 Months Ended
	Mar. 31, 2018
Investments, Debt and Equity Securities [Abstract]
SECURITIES	SECURITIES The amortized cost and fair value of securities are as follows: (in thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Securities Available for Sale: March 31, 2018 U.S. government-sponsored entities $ 364,600 $ — $ (5,952 ) $ 358,648 Residential mortgage-backed securities: Agency mortgage-backed securities 1,713,036 458 (41,921 ) 1,671,573 Agency collateralized mortgage obligations 860,902 28 (28,580 ) 832,350 Non-agency collateralized mortgage obligations 1 — — 1 Commercial mortgage-backed securities 39,183 30 — 39,213 States of the U.S. and political subdivisions 21,138 3 (118 ) 21,023 Other debt securities 4,916 — (261 ) 4,655 Total debt securities available for sale $ 3,003,776 $ 519 $ (76,832 ) $ 2,927,463 December 31, 2017 U.S. government-sponsored entities $ 347,767 $ 52 $ (3,877 ) $ 343,942 Residential mortgage-backed securities: Agency mortgage-backed securities 1,615,168 1,225 (17,519 ) 1,598,874 Agency collateralized mortgage obligations 813,034 — (18,077 ) 794,957 Non-agency collateralized mortgage obligations 1 — — 1 States of the U.S. and political subdivisions 21,151 6 (64 ) 21,093 Other debt securities 4,913 — (243 ) 4,670 Total debt securities 2,802,034 1,283 (39,780 ) 2,763,537 Equity securities 587 438 — 1,025 Total securities available for sale $ 2,802,621 $ 1,721 $ (39,780 ) $ 2,764,562 (in thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Debt Securities Held to Maturity: March 31, 2018 U.S. Treasury $ 500 $ 114 $ — $ 614 U.S. government-sponsored entities 247,272 81 (5,716 ) 241,637 Residential mortgage-backed securities: Agency mortgage-backed securities 1,174,426 491 (27,472 ) 1,147,445 Agency collateralized mortgage obligations 783,151 257 (29,971 ) 753,437 Commercial mortgage-backed securities 79,476 32 (1,245 ) 78,263 States of the U.S. and political subdivisions 939,175 2,483 (31,090 ) 910,568 Total debt securities held to maturity $ 3,224,000 $ 3,458 $ (95,494 ) $ 3,131,964 December 31, 2017 U.S. Treasury $ 500 $ 134 $ — $ 634 U.S. government-sponsored entities 247,310 93 (4,388 ) 243,015 Residential mortgage-backed securities: Agency mortgage-backed securities 1,219,802 3,475 (9,058 ) 1,214,219 Agency collateralized mortgage obligations 777,146 32 (20,095 ) 757,083 Commercial mortgage-backed securities 80,786 414 (575 ) 80,625 States of the U.S. and political subdivisions 916,724 13,209 (7,130 ) 922,803 Total debt securities held to maturity $ 3,242,268 $ 17,357 $ (41,246 ) $ 3,218,379 Gross gains and gross losses were realized on securities as follows: Three Months Ended (in thousands) 2018 2017 Gross gains $ — $ 3,400 Gross losses — (775 ) Net gains $ — $ 2,625 As of March 31, 2018 , the amortized cost and fair value of debt securities, by contractual maturities, were as follows: Available for Sale Held to Maturity (in thousands) Amortized Cost Fair Value Amortized Cost Fair Value Due in one year or less $ 65,814 $ 65,498 $ 45,461 $ 45,221 Due from one to five years 262,236 256,811 210,014 204,580 Due from five to ten years 7,876 7,725 94,022 93,225 Due after ten years 54,728 54,292 837,450 809,793 390,654 384,326 1,186,947 1,152,819 Residential mortgage-backed securities: Agency mortgage-backed securities 1,713,036 1,671,573 1,174,426 1,147,445 Agency collateralized mortgage obligations 860,902 832,350 783,151 753,437 Non-agency collateralized mortgage obligations 1 1 — — Commercial mortgage-backed securities 39,183 39,213 79,476 78,263 Total debt securities $ 3,003,776 $ 2,927,463 $ 3,224,000 $ 3,131,964 Maturities may differ from contractual terms because borrowers may have the right to call or prepay obligations with or without penalties. Periodic payments are received on residential mortgage-backed securities based on the payment patterns of the underlying collateral. Following is information relating to securities pledged: (dollars in thousands) March 31, December 31, Securities pledged (carrying value): To secure public deposits, trust deposits and for other purposes as required by law $ 3,532,023 $ 3,491,634 As collateral for short-term borrowings 298,233 263,756 Securities pledged as a percent of total securities 62.3 % 62.5 % Following are summaries of the fair values and unrealized losses of temporarily impaired debt securities, segregated by length of impairment: Less than 12 Months 12 Months or More Total (dollars in thousands) # Fair Value Unrealized Losses # Fair Value Unrealized Losses # Fair Value Unrealized Losses Debt Securities Available for Sale March 31, 2018 U.S. government-sponsored entities 8 $ 158,212 $ (1,389 ) 10 $ 200,436 $ (4,563 ) 18 $ 358,648 $ (5,952 ) Residential mortgage-backed securities: Agency mortgage-backed securities 59 1,212,767 (25,545 ) 28 444,583 (16,376 ) 87 1,657,350 (41,921 ) Agency collateralized mortgage obligations 16 470,878 (13,274 ) 33 312,687 (15,306 ) 49 783,565 (28,580 ) States of the U.S. and political subdivisions 7 11,434 (108 ) 1 877 (10 ) 8 12,311 (118 ) Other debt securities — — — 3 4,655 (261 ) 3 4,655 (261 ) Total temporarily impaired debt securities AFS 90 $ 1,853,291 $ (40,316 ) 75 $ 963,238 $ (36,516 ) 165 $ 2,816,529 $ (76,832 ) December 31, 2017 U.S. government-sponsored entities 7 $ 106,809 $ (363 ) 10 $ 201,485 $ (3,514 ) 17 $ 308,294 $ (3,877 ) Residential mortgage-backed securities: Agency mortgage-backed securities 43 976,738 (7,723 ) 28 473,625 (9,796 ) 71 1,450,363 (17,519 ) Agency collateralized mortgage obligations 14 409,005 (6,231 ) 33 335,452 (11,846 ) 47 744,457 (18,077 ) States of the U.S. and political subdivisions 7 11,254 (55 ) 1 879 (9 ) 8 12,133 (64 ) Other debt securities — — — 3 4,670 (243 ) 3 4,670 (243 ) Total temporarily impaired debt securities AFS 71 $ 1,503,806 $ (14,372 ) 75 $ 1,016,111 $ (25,408 ) 146 $ 2,519,917 $ (39,780 ) Less than 12 Months 12 Months or More Total (dollars in thousands) # Fair Value Unrealized Losses # Fair Value Unrealized Losses # Fair Value Unrealized Losses Debt Securities Held to Maturity March 31, 2018 U.S. government-sponsored entities 4 $ 54,558 $ (465 ) 10 $ 184,750 $ (5,251 ) 14 $ 239,308 $ (5,716 ) Residential mortgage-backed securities: Agency mortgage-backed securities 73 935,246 (20,410 ) 11 173,759 (7,062 ) 84 1,109,005 (27,472 ) Agency collateralized mortgage obligations 16 267,299 (5,862 ) 35 444,572 (24,109 ) 51 711,871 (29,971 ) Commercial mortgage-backed securities 6 48,737 (637 ) 3 19,909 (608 ) 9 68,646 (1,245 ) States of the U.S. and political subdivisions 148 517,101 (16,245 ) 37 112,879 (14,845 ) 185 629,980 (31,090 ) Total temporarily impaired debt securities HTM 247 $ 1,822,941 $ (43,619 ) 96 $ 935,869 $ (51,875 ) 343 $ 2,758,810 $ (95,494 ) December 31, 2017 U.S. government-sponsored entities 4 $ 54,790 $ (239 ) 10 $ 185,851 $ (4,149 ) 14 $ 240,641 $ (4,388 ) Residential mortgage-backed securities: Agency mortgage-backed securities 36 648,485 (4,855 ) 11 183,989 (4,203 ) 47 832,474 (9,058 ) Agency collateralized mortgage obligations 14 275,290 (1,701 ) 35 473,257 (18,394 ) 49 748,547 (20,095 ) Commercial mortgage-backed securities 3 26,399 (123 ) 2 19,443 (452 ) 5 45,842 (575 ) States of the U.S. and political subdivisions 16 56,739 (933 ) 37 121,536 (6,197 ) 53 178,275 (7,130 ) Total temporarily impaired debt securities HTM 73 $ 1,061,703 $ (7,851 ) 95 $ 984,076 $ (33,395 ) 168 $ 2,045,779 $ (41,246 ) 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 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, 2018 or 2017 . States of the U.S. and Political Subdivisions Our municipal bond portfolio with a carrying amount of $960.2 million as of March 31, 2018 is highly rated with an average entity-specific rating of AA and 100% of the portfolio rated A or better. All of the securities in the municipal portfolio except one are general obligation bonds. Geographically, municipal bonds support our primary footprint as 65% 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 $3.0 million . In addition to the strong stand-alone ratings, 62% 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, 2018
Receivables [Abstract]
LOANS AND LEASES	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 Leases March 31, 2018 Commercial real estate $ 5,465,150 $ 3,346,325 $ 8,811,475 Commercial and industrial 3,688,120 591,849 4,279,969 Commercial leases 279,582 — 279,582 Other 39,347 — 39,347 Total commercial loans and leases 9,472,199 3,938,174 13,410,373 Direct installment 1,737,242 134,397 1,871,639 Residential mortgages 2,131,338 630,763 2,762,101 Indirect installment 1,524,330 171 1,524,501 Consumer lines of credit 1,135,488 558,295 1,693,783 Total consumer loans 6,528,398 1,323,626 7,852,024 Total loans and leases, net of unearned income $ 16,000,597 $ 5,261,800 $ 21,262,397 December 31, 2017 Commercial real estate $ 5,174,783 $ 3,567,081 $ 8,741,864 Commercial and industrial 3,495,247 675,420 4,170,667 Commercial leases 266,720 — 266,720 Other 17,063 — 17,063 Total commercial loans and leases 8,953,813 4,242,501 13,196,314 Direct installment 1,755,713 149,822 1,905,535 Residential mortgages 2,036,226 666,465 2,702,691 Indirect installment 1,448,268 165 1,448,433 Consumer lines of credit 1,151,470 594,323 1,745,793 Total consumer loans 6,391,677 1,410,775 7,802,452 Total loans and leases, net of unearned income $ 15,345,490 $ 5,653,276 $ 20,998,766 The loans and leases portfolio categories are comprised of the following: • Commercial real estate includes both owner-occupied and non-owner-occupied loans secured by commercial properties; • Commercial and industrial includes loans to businesses that are not secured by real estate; • Commercial leases consist of leases for new or used equipment; • Other is comprised primarily of credit cards and mezzanine loans; • Direct installment is comprised of fixed-rate, closed-end consumer loans for personal, family or household use, such as home equity loans and automobile loans; • Residential mortgages consist of conventional and jumbo mortgage loans for 1 - 4 family properties; • Indirect installment is comprised of loans originated by approved third parties and underwritten by us, primarily automobile loans; and • Consumer lines of credit include home equity lines of credit and consumer lines of credit that are either unsecured or secured by collateral other than home equity. The loans and leases portfolio consists principally of loans to individuals and small- and medium-sized businesses within our primary market areas of Pennsylvania, eastern Ohio, Maryland, North Carolina, South Carolina and northern West Virginia. The following table shows certain information relating to commercial real estate loans: (dollars in thousands) March 31, December 31, Commercial construction, acquisition and development loans $ 1,167,699 $ 1,170,175 Percent of total loans and leases 5.5 % 5.6 % Commercial real estate: Percent owner-occupied 35.2 % 35.3 % Percent non-owner-occupied 64.8 % 64.7 % 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 2017 Annual Report on Form 10-K for a discussion of ASC 310-20 and ASC 310-30 loans. The outstanding balance and the carrying amount of acquired loans included in the Consolidated Balance Sheets are as follows: (in thousands) March 31, December 31, Accounted for under ASC 310-30: Outstanding balance $ 4,853,516 $ 5,176,015 Carrying amount 4,521,926 4,834,256 Accounted for under ASC 310-20: Outstanding balance 754,251 835,130 Carrying amount 733,037 812,322 Total acquired loans: Outstanding balance 5,607,767 6,011,145 Carrying amount 5,254,963 5,646,578 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 $1.7 million at March 31, 2018 and $1.9 million at December 31, 2017 , representing 0.03% of the carrying amount of total acquired loans as of each date. The following table provides changes in accretable yield for all acquired loans accounted for under ASC 310-30. Loans accounted for under ASC 310-20 are not included in this table. Three Months Ended (in thousands) 2018 2017 Balance at beginning of period $ 708,481 $ 467,070 Acquisitions — 443,261 Reduction due to unexpected early payoffs (25,833 ) (20,560 ) Reclass from non-accretable difference 64,216 23,106 Disposals/transfers (57 ) (36 ) Other (403 ) — Accretion (59,079 ) (25,241 ) Balance at end of period $ 687,325 $ 887,600 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, 2018 , there was an overall improvement in cash flow expectations which resulted in a net reclassification of $64.2 million from the non-accretable difference to accretable yield. This reclassification was $23.1 million for the three months ended March 31, 2017 . The reclassification from the non-accretable difference to the accretable yield results in prospective yield adjustments on the loan pools. Credit Quality Management monitors the credit quality of our loan portfolio using several performance measures to do so based on payment activity and borrower performance. Non-performing loans include non-accrual loans and non-performing TDRs. Past due loans are reviewed on a monthly basis to identify loans for non-accrual status. We place originated loans on non-accrual status and discontinue interest accruals on originated loans generally when principal or interest is due and has remained unpaid for a certain number of days or when the full amount of principal and interest is due and has remained unpaid for a certain number of days, unless the loan is both well secured and in the process of collection. Commercial loans and leases are placed on non-accrual at 90 days, installment loans are placed on non-accrual at 120 days and residential mortgages and consumer lines of credit are generally placed on non-accrual at 180 days, though we may place a loan on non-accrual prior to these past due thresholds as warranted. When a loan is placed on non-accrual status, all unpaid accrued interest is reversed. Non-accrual loans may not be restored to accrual status until all delinquent principal and interest have been paid and the ultimate ability to collect the remaining principal and interest is reasonably assured. The majority of TDRs are loans in which we have granted a concession on the interest rate or the original repayment terms due to the borrower’s financial distress. Following is a summary of non-performing assets: (dollars in thousands) March 31, December 31, Non-accrual loans $ 77,684 $ 74,635 Troubled debt restructurings 24,452 23,481 Total non-performing loans 102,136 98,116 Other real estate owned 40,980 40,606 Total non-performing assets $ 143,116 $ 138,722 Asset quality ratios: Non-performing loans / total loans and leases 0.48 % 0.47 % Non-performing loans + OREO / total loans and leases + OREO 0.67 % 0.66 % Non-performing assets / total assets 0.45 % 0.44 % The carrying value of residential other real estate owned held as a result of obtaining physical possession upon completion of a foreclosure or through completion of a deed in lieu of foreclosure amounted to $4.8 million at March 31, 2018 and $3.6 million at December 31, 2017 . The recorded investment of consumer mortgage loans secured by residential real estate properties for which formal foreclosure proceedings are in process at March 31, 2018 and December 31, 2017 totaled $13.8 million and $15.2 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 > 90 Days Past Due and Still Accruing Non- Accrual Total Past Due Current Total Loans and Leases Originated Loans and Leases March 31, 2018 Commercial real estate $ 8,345 $ 1 $ 27,349 $ 35,695 $ 5,429,455 $ 5,465,150 Commercial and industrial 6,793 3 19,705 26,501 3,661,619 3,688,120 Commercial leases 692 — 1,399 2,091 277,491 279,582 Other 183 73 1,000 1,256 38,091 39,347 Total commercial loans and leases 16,013 77 49,453 65,543 9,406,656 9,472,199 Direct installment 8,129 3,913 8,411 20,453 1,716,789 1,737,242 Residential mortgages 14,870 1,982 5,254 22,106 2,109,232 2,131,338 Indirect installment 6,850 511 2,234 9,595 1,514,735 1,524,330 Consumer lines of credit 4,550 821 2,769 8,140 1,127,348 1,135,488 Total consumer loans 34,399 7,227 18,668 60,294 6,468,104 6,528,398 Total originated loans and leases $ 50,412 $ 7,304 $ 68,121 $ 125,837 $ 15,874,760 $ 16,000,597 December 31, 2017 Commercial real estate $ 8,273 $ 1 $ 24,773 $ 33,047 $ 5,141,736 $ 5,174,783 Commercial and industrial 8,948 3 17,077 26,028 3,469,219 3,495,247 Commercial leases 1,382 41 1,574 2,997 263,723 266,720 Other 83 153 1,000 1,236 15,827 17,063 Total commercial loans and leases 18,686 198 44,424 63,308 8,890,505 8,953,813 Direct installment 13,192 4,466 8,896 26,554 1,729,159 1,755,713 Residential mortgages 14,096 2,832 5,771 22,699 2,013,527 2,036,226 Indirect installment 10,313 611 2,240 13,164 1,435,104 1,448,268 Consumer lines of credit 5,859 1,014 2,313 9,186 1,142,284 1,151,470 Total consumer loans 43,460 8,923 19,220 71,603 6,320,074 6,391,677 Total originated loans and leases $ 62,146 $ 9,121 $ 63,644 $ 134,911 $ 15,210,579 $ 15,345,490 (in thousands) 30-89 Days Past Due > 90 Days Past Due and Still Accruing Non- Accrual Total Past Due (1) (2) Current (Discount) Premium Total Loans Acquired Loans March 31, 2018 Commercial real estate $ 32,697 $ 64,550 $ 3,735 $ 100,982 $ 3,433,231 $ (187,888 ) $ 3,346,325 Commercial and industrial 5,135 4,617 4,652 14,404 612,354 (34,909 ) 591,849 Total commercial loans 37,832 69,167 8,387 115,386 4,045,585 (222,797 ) 3,938,174 Direct installment 2,826 1,746 — 4,572 128,754 1,071 134,397 Residential mortgages 15,113 13,059 — 28,172 642,966 (40,375 ) 630,763 Indirect installment — 1 — 1 7 163 171 Consumer lines of credit 5,357 2,139 1,176 8,672 561,906 (12,283 ) 558,295 Total consumer loans 23,296 16,945 1,176 41,417 1,333,633 (51,424 ) 1,323,626 Total acquired loans $ 61,128 $ 86,112 $ 9,563 $ 156,803 $ 5,379,218 $ (274,221 ) $ 5,261,800 December 31, 2017 Commercial real estate $ 34,928 $ 63,092 $ 3,975 $ 101,995 $ 3,657,152 $ (192,066 ) $ 3,567,081 Commercial and industrial 3,187 6,452 5,663 15,302 698,265 (38,147 ) 675,420 Total commercial loans 38,115 69,544 9,638 117,297 4,355,417 (230,213 ) 4,242,501 Direct installment 5,267 2,013 — 7,280 141,386 1,156 149,822 Residential mortgages 17,191 15,139 — 32,330 675,499 (41,364 ) 666,465 Indirect installment — 1 — 1 10 154 165 Consumer lines of credit 6,353 3,253 1,353 10,959 596,298 (12,934 ) 594,323 Total consumer loans 28,811 20,406 1,353 50,570 1,413,193 (52,988 ) 1,410,775 Total acquired loans $ 66,926 $ 89,950 $ 10,991 $ 167,867 $ 5,768,610 $ (283,201 ) $ 5,653,276 (1) Past due information for acquired loans is based on the contractual balance outstanding at March 31, 2018 and December 31, 2017 . (2) Acquired loans are considered performing upon acquisition, regardless of whether the customer is contractually delinquent, if 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 or non-performing and continue to recognize interest income on these loans using the accretion method. Acquired loans are considered non-accrual or non-performing when, due to credit deterioration or other factors, we determine we are no longer able to reasonably estimate the timing and amount of expected cash flows on such loans. We do not recognize interest income on acquired loans considered non-accrual or 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 of the borrower and the performance of the loan is satisfactory or better Special Mention in general, the condition of the borrower has deteriorated, requiring an increased level of monitoring Substandard in general, the condition of the borrower has significantly deteriorated and the performance of the loan could further deteriorate if deficiencies are not corrected Doubtful in general, the condition of the borrower has significantly deteriorated and the collection in full of both principal and interest is highly questionable or improbable The use of these internally assigned credit quality categories within the commercial loan 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 Mention Substandard Doubtful Total Originated Loans and Leases March 31, 2018 Commercial real estate $ 5,195,183 $ 148,120 $ 121,542 $ 305 $ 5,465,150 Commercial and industrial 3,412,745 191,627 80,803 2,945 3,688,120 Commercial leases 269,837 3,518 6,227 — 279,582 Other 38,231 43 1,073 — 39,347 Total originated commercial loans and leases $ 8,915,996 $ 343,308 $ 209,645 $ 3,250 $ 9,472,199 December 31, 2017 Commercial real estate $ 4,922,872 $ 152,744 $ 98,728 $ 439 $ 5,174,783 Commercial and industrial 3,266,966 132,975 92,091 3,215 3,495,247 Commercial leases 260,235 4,425 2,060 — 266,720 Other 15,866 43 1,154 — 17,063 Total originated commercial loans and leases $ 8,465,939 $ 290,187 $ 194,033 $ 3,654 $ 8,953,813 Acquired Loans March 31, 2018 Commercial real estate $ 2,877,345 $ 225,364 $ 243,402 $ 214 $ 3,346,325 Commercial and industrial 520,361 28,166 43,314 8 591,849 Total acquired commercial loans $ 3,397,706 $ 253,530 $ 286,716 $ 222 $ 3,938,174 December 31, 2017 Commercial real estate $ 3,102,788 $ 250,987 $ 213,089 $ 217 $ 3,567,081 Commercial and industrial 603,611 26,059 45,661 89 675,420 Total acquired commercial loans $ 3,706,399 $ 277,046 $ 258,750 $ 306 $ 4,242,501 Credit quality information for acquired loans is based on the contractual balance outstanding at March 31, 2018 and December 31, 2017 . 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, Fair Isaac Corporation (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, 2018 Direct installment $ 1,721,589 $ 15,653 $ 1,737,242 Residential mortgages 2,115,204 16,134 2,131,338 Indirect installment 1,521,906 2,424 1,524,330 Consumer lines of credit 1,130,978 4,510 1,135,488 Total originated consumer loans $ 6,489,677 $ 38,721 $ 6,528,398 December 31, 2017 Direct installment $ 1,739,060 $ 16,653 $ 1,755,713 Residential mortgages 2,019,816 16,410 2,036,226 Indirect installment 1,445,833 2,435 1,448,268 Consumer lines of credit 1,147,576 3,894 1,151,470 Total originated consumer loans $ 6,352,285 $ 39,392 $ 6,391,677 Acquired loans March 31, 2018 Direct installment $ 134,327 $ 70 $ 134,397 Residential mortgages 630,763 — 630,763 Indirect installment 171 — 171 Consumer lines of credit 556,633 1,662 558,295 Total acquired consumer loans $ 1,321,894 $ 1,732 $ 1,323,626 December 31, 2017 Direct installment $ 149,751 $ 71 $ 149,822 Residential mortgages 666,465 — 666,465 Indirect installment 165 — 165 Consumer lines of credit 592,384 1,939 594,323 Total acquired consumer loans $ 1,408,765 $ 2,010 $ 1,410,775 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 days) is noted or there are subsequent events that impact repayment probability (i.e., negative financial trends, bankruptcy filings, imminent foreclosure proceedings, etc.). Impairment is evaluated in the aggregate for consumer installment loans, residential mortgages, consumer lines of credit and commercial loan and lease relationships less than $0.5 million based on loan and lease segment loss given default. For commercial loan and lease relationships greater than or equal to $0.5 million , a specific valuation allowance is allocated, if necessary, so that the loan is reported net, at the present value of estimated future cash flows using a market interest rate or at the fair value of collateral if repayment is expected solely from the collateral. Consistent with our existing method of income recognition for loans and leases, interest income on impaired loans, except those classified as non-accrual, is recognized using the accrual method. Impaired loans, or portions thereof, are charged off when deemed uncollectible. Following is a summary of information pertaining to originated loans and leases considered to be impaired, by class of loan and lease: (in thousands) Unpaid Contractual Principal Balance Recorded Investment With No Specific Reserve Recorded Investment With Specific Reserve Total Recorded Investment Specific Reserve Average Recorded Investment At or for the Three Months Ended March 31, 2018 Commercial real estate $ 30,584 $ 25,478 $ 1,751 $ 27,229 $ 305 $ 25,988 Commercial and industrial 26,034 15,859 5,007 20,866 2,945 20,479 Commercial leases 1,399 1,399 — 1,399 — 1,486 Other — — — — — — Total commercial loans and leases 58,017 42,736 6,758 49,494 3,250 47,953 Direct installment 18,623 15,653 — 15,653 — 16,153 Residential mortgages 17,448 16,134 — 16,134 — 16,272 Indirect installment 4,648 2,424 — 2,424 — 2,429 Consumer lines of credit 5,698 4,510 — 4,510 — 4,202 Total consumer loans 46,417 38,721 — 38,721 — 39,056 Total $ 104,434 $ 81,457 $ 6,758 $ 88,215 $ 3,250 $ 87,009 At or for the Year Ended Commercial real estate $ 27,718 $ 21,748 $ 2,906 $ 24,654 $ 439 $ 24,413 Commercial and industrial 29,307 11,595 4,457 16,052 3,215 23,907 Commercial leases 1,574 1,574 — 1,574 — 1,386 Other — — — — — — Total commercial loans and leases 58,599 34,917 7,363 42,280 3,654 49,706 Direct installment 19,375 16,653 — 16,653 — 16,852 Residential mortgages 17,754 16,410 — 16,410 — 15,984 Indirect installment 5,709 2,435 — 2,435 — 2,279 Consumer lines of credit 5,039 3,894 — 3,894 — 3,815 Total consumer loans 47,877 39,392 — 39,392 — 38,930 Total $ 106,476 $ 74,309 $ 7,363 $ 81,672 $ 3,654 $ 88,636 Interest income continued to accrue on certain impaired loans and totaled approximately $1.6 million and $1.9 million for the three months ended March 31, 2018 and 2017 , respectively. The above tables do not reflect the additional allowance for credit losses relating to acquired loans. Following is a summary of the allowance for credit losses required for acquired loans due to changes in credit quality subsequent to the acquisition date: (in thousands) March 31, December 31, Commercial real estate $ 2,732 $ 4,976 Commercial and industrial 1,785 (415 ) Total commercial loans 4,517 4,561 Direct installment 1,804 1,553 Residential mortgages 518 484 Indirect installment 240 177 Consumer lines of credit (242 ) (77 ) Total consumer loans 2,320 2,137 Total allowance on acquired loans $ 6,837 $ 6,698 Troubled Debt Restructurings TDRs are loans whose contractual terms have been modified in a manner that grants a concession to a borrower experiencing financial difficulties. TDRs typically result from loss mitigation activities and could include the extension of a maturity date, interest rate reduction, principal forgiveness, deferral or decrease in payments for a period of time and other actions intended to minimize the economic loss and to avoid foreclosure or repossession of collateral. Following is a summary of the composition of total TDRs: (in thousands) Originated Acquired Total March 31, 2018 Accruing: Performing $ 19,525 $ 249 $ 19,774 Non-performing 21,283 3,169 24,452 Non-accrual 10,668 357 11,025 Total TDRs $ 51,476 $ 3,775 $ 55,251 December 31, 2017 Accruing: Performing $ 19,538 $ 266 $ 19,804 Non-performing 20,173 3,308 23,481 Non-accrual 10,472 234 10,706 Total TDRs $ 50,183 $ 3,808 $ 53,991 TDRs that are accruing and performing include loans that met the criteria for non-accrual of interest prior to restructuring for which we can reasonably estimate the timing and amount of the expected cash flows on such loans and for which we expect to fully collect the new carrying value of the loans. During the three months ended March 31, 2018 , we returned to performing status $1.2 million in restructured residential mortgage loans that have consistently met their modified obligations for more than six months. TDRs that are accruing and non-performing are comprised of consumer loans that have not demonstrated a consistent repayment pattern on the modified terms for more than six months, however it is expected that we will collect all future principal and interest payments. TDRs that are on non-accrual are not placed on accruing status until all delinquent principal and interest have been paid and the ultimate collectability of the remaining principal and interest is reasonably assured. Some loan modifications classified as TDRs may not ultimately result in the full collection of principal and interest, as modified, and may result in potential incremental losses which are factored into the allowance for credit losses. Excluding purchased impaired loans, commercial loans over $0.5 million whose terms have been modified in a TDR are generally placed on non-accrual, individually analyzed and measured for estimated impairment based on the fair value of the underlying collateral. Our allowance for credit losses included specific reserves for commercial TDRs and pooled reserves for individually impaired loans under $0.5 million based on loan segment loss given default. Upon default, the amount of the recorded investment in the TDR in excess of the fair value of the collateral, less estimated selling costs, is generally considered a confirmed loss and is charged-off against the allowance for credit losses. The reserve for commercial TDRs included in the allowance for credit losses is presented in the following table: (in thousands) March 31, December 31, Specific reserves for commercial TDRs $ 726 $ 95 Pooled reserves for individual commercial loans 519 469 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 $4.0 million for both March 31, 2018 and December 31, 2017 . Upon default of an individual loan, our charge-off policy is followed accordingly for that class of loan. Following is a summary of TDR loans, by class: Three Months Ended March 31, 2018 (dollars in thousands) Number of Contracts Pre- Modification Outstanding Recorded Investment Post- Modification Outstanding Recorded Investment Commercial real estate 1 $ 328 $ 328 Commercial and industrial 1 1,687 1,230 Total commercial loans 2 2,015 1,558 Direct installment 182 1,135 1,056 Residential mortgages 11 501 504 Indirect installment 9 13 12 Consumer lines of credit 21 352 287 Total consumer loans 223 2,001 1,859 Total 225 $ 4,016 $ 3,417 Three Months Ended March 31, 2017 (dollars in thousands) Number of Contracts Pre- Modification Outstanding Recorded Investment Post- Modification Outstanding Recorded Investment Commercial real estate 1 $ 114 $ 109 Commercial and industrial — — — Total commercial loans 1 114 109 Direct installment 171 1,488 1,412 Residential mortgages 8 163 176 Indirect installment 5 17 14 Consumer lines of credit 22 742 729 Total consumer loans 206 2,410 2,331 Total 207 $ 2,524 $ 2,440 Following is a summary of originated TDRs, by class, for which there was a payment default, excluding loans that were either charged-off or cured by period end. Default occurs when a loan is 90 days or more past due and is within 12 months of restructuring. Three Months Ended (dollars in thousands) Number of Contracts Recorded Investment Direct installment 45 $ 130 Residential mortgages 4 190 Indirect installment 5 10 Consumer lines of credit 1 196 Total consumer loans 55 526 Total 55 $ 526 Three Months Ended (dollars in thousands) Number of Contracts Recorded Investment Direct installment 29 $ 82 Residential mortgages 2 224 Indirect installment 6 10 Consumer lines of credit 1 34 Total consumer loans 38 350 Total 38 $ 350

ALLOWANCE FOR CREDIT LOSSES

ALLOWANCE FOR CREDIT LOSSES	3 Months Ended
	Mar. 31, 2018
Receivables [Abstract]
ALLOWANCE FOR CREDIT LOSSES	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 Period Charge- Offs Recoveries Net Charge- Offs Provision for Credit Losses Balance at End of Period Three Months Ended March 31, 2018 Commercial real estate $ 50,281 $ (225 ) $ 337 $ 112 $ 3,123 $ 53,516 Commercial and industrial 51,963 (5,920 ) 369 (5,551 ) 6,601 53,013 Commercial leases 5,646 (171 ) 10 (161 ) 630 6,115 Other 1,843 (797 ) 297 (500 ) 652 1,995 Total commercial loans and leases 109,733 (7,113 ) 1,013 (6,100 ) 11,006 114,639 Direct installment 20,936 (3,470 ) 440 (3,030 ) 2,222 20,128 Residential mortgages 15,507 (79 ) 91 12 (239 ) 15,280 Indirect installment 11,967 (2,409 ) 895 (1,514 ) 1,502 11,955 Consumer lines of credit 10,539 (531 ) 121 (410 ) 279 10,408 Total consumer loans 58,949 (6,489 ) 1,547 (4,942 ) 3,764 57,771 Total allowance on originated loans and leases 168,682 (13,602 ) 2,560 (11,042 ) 14,770 172,410 Purchased credit-impaired loans 635 — — — (13 ) 622 Other acquired loans 6,063 (309 ) 723 414 (262 ) 6,215 Total allowance on acquired loans 6,698 (309 ) 723 414 (275 ) 6,837 Total allowance for credit losses $ 175,380 $ (13,911 ) $ 3,283 $ (10,628 ) $ 14,495 $ 179,247 (in thousands) Balance at Beginning of Period Charge- Offs Recoveries Net Charge- Offs Provision for Credit Losses Balance at End of Period 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 Other 1,392 (973 ) 327 (646 ) 1,063 1,809 Total commercial loans and leases 99,298 (4,930 ) 1,163 (3,767 ) 9,750 105,281 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 Total consumer loans 51,493 (5,882 ) 1,735 (4,147 ) 1,587 48,933 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 for credit losses $ 158,059 $ (11,294 ) $ 3,167 $ (8,127 ) $ 10,850 $ 160,782 Following is a summary of the individual and collective originated allowance for credit losses and corresponding originated 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 Leases Individually Evaluated for Impairment Collectively Evaluated for Impairment March 31, 2018 Commercial real estate $ 305 $ 53,211 $ 5,465,150 $ 12,292 $ 5,452,858 Commercial and industrial 2,945 50,068 3,688,120 10,880 3,677,240 Commercial leases — 6,115 279,582 — 279,582 Other — 1,995 39,347 — 39,347 Total commercial loans and leases 3,250 111,389 9,472,199 23,172 9,449,027 Direct installment — 20,128 1,737,242 — 1,737,242 Residential mortgages — 15,280 2,131,338 — 2,131,338 Indirect installment — 11,955 1,524,330 — 1,524,330 Consumer lines of credit — 10,408 1,135,488 — 1,135,488 Total consumer loans — 57,771 6,528,398 — 6,528,398 Total $ 3,250 $ 169,160 $ 16,000,597 $ 23,172 $ 15,977,425 December 31, 2017 Commercial real estate $ 439 $ 49,842 $ 5,174,783 $ 11,114 $ 5,163,669 Commercial and industrial 3,215 48,748 3,495,247 9,872 3,485,375 Commercial leases — 5,646 266,720 — 266,720 Other — 1,843 17,063 — 17,063 Total commercial loans and leases 3,654 106,079 8,953,813 20,986 8,932,827 Direct installment — 20,936 1,755,713 — 1,755,713 Residential mortgages — 15,507 2,036,226 — 2,036,226 Indirect installment — 11,967 1,448,268 — 1,448,268 Consumer lines of credit — 10,539 1,151,470 — 1,151,470 Total consumer loans — 58,949 6,391,677 — 6,391,677 Total $ 3,654 $ 165,028 $ 15,345,490 $ 20,986 $ 15,324,504 The above table excludes acquired loans that were pooled into groups of loans for evaluating impairment.

LOAN SERVICING

LOAN SERVICING	3 Months Ended
	Mar. 31, 2018
Transfers and Servicing [Abstract]
LOAN SERVICING	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, as of March 31, 2018 and December 31, 2017 , is listed below: (in thousands) March 31, 2018 December 31, 2017 Mortgage loans sold with servicing retained $ 3,417,642 $ 3,256,548 The following table summarizes activity relating to mortgage loans sold with servicing retained: Three Months Ended March 31, (in thousands) 2018 2017 Mortgage loans sold with servicing retained $ 236,893 $ 129,843 Pretax gains resulting from above loan sales (1) 3,798 3,638 Mortgage servicing fees (1) 2,174 1,603 (1) Recorded in mortgage banking operations. Following is a summary of the MSR activity: Three Months Ended (in thousands) 2018 2017 Balance at beginning of period $ 29,053 $ 13,521 Fair value of MSRs acquired — 8,553 Additions 2,710 1,454 Payoffs and curtailments (405 ) (139 ) Amortization (567 ) (523 ) Balance at end of period $ 30,791 $ 22,866 Fair value, beginning of period $ 32,419 $ 17,546 Fair value, end of period 36,445 26,962 We did not have a valuation allowance for MSRs for any of the periods 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 and as interest rates increase, mortgage loan prepayments decline, which results in an increase 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, December 31, Weighted average life (months) 84.5 80.4 Constant prepayment rate (annualized) 9.1 % 9.9 % Discount rate 9.9 % 9.9 % Effect on fair value due to change in interest rates: +0.25% $ 1,179 $ 1,737 +0.50% 2,131 3,220 -0.25% (1,476 ) (1,937 ) -0.50% (3,237 ) (4,007 ) 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 Loan Servicing Beginning in March 2017, as a result of the YDKN acquisition, we retain the servicing rights on SBA-guaranteed loans sold to investors. The standard sale structure under the SBA Secondary Participation Guaranty Agreement provides for us to retain a portion of the cash flow from the interest payment received on the loan, which is commonly known as a servicing spread. The unpaid principal balance of SBA-guaranteed loans serviced for investors, as of March 31, 2018 and December 31, 2017 , was as follows: (in thousands) March 31, December 31, SBA loans sold to investors with servicing retained $ 300,857 $ 305,977 The following table summarizes activity relating to SBA loans sold with servicing retained: Three Months Ended (in thousands) 2018 2017 SBA loans sold with servicing retained $ 12,288 $ — Pretax gains resulting from above loan sales (1) 1,101 — SBA servicing fees (1) 750 115 (1) Recorded in non-interest income. Following is a summary of the activity in SBA servicing rights: Three Months Ended (in thousands) 2017 2017 Balance at beginning of period $ 5,058 $ — Fair value of servicing rights acquired — 5,399 Additions 388 — Impairment (charge) / recovery (90 ) — Amortization (294 ) (60 ) Balance at end of period $ 5,062 $ 5,339 Fair value, beginning of period $ 5,058 $ — Fair value, end of period 5,062 5,339 Following is a summary of key assumptions and the sensitivity of the SBA loan servicing rights to changes in these assumptions: March 31, 2018 December 31, 2017 Decline in fair value due to Decline in fair value due to (dollars in thousands) Actual 10% adverse change 20% adverse change 1% adverse change 2% adverse change Actual 10% adverse change 20% adverse change 1% adverse change 2% adverse change Weighted-average life (months) 61.0 63.5 Constant prepayment rate (annualized) 10.01 % $ (158 ) $ (309 ) $ — $ — 9.29 % $ (145 ) $ (284 ) $ — $ — Discount rate 14.76 — — (148 ) (287 ) 14.87 — — (147 ) (286 ) The fair value of the SBA servicing rights is compared to the amortized basis. 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 had a $0.4 million valuation allowance for SBA servicing rights as of March 31, 2018 .

BORROWINGS

BORROWINGS	3 Months Ended
	Mar. 31, 2018
Debt Disclosure [Abstract]
BORROWINGS	BORROWINGS Following is a summary of short-term borrowings: (in thousands) March 31, December 31, Securities sold under repurchase agreements $ 280,492 $ 256,017 Federal Home Loan Bank advances 1,555,000 2,285,000 Federal funds purchased 1,830,000 1,000,000 Subordinated notes 136,988 137,320 Total short-term borrowings $ 3,802,480 $ 3,678,337 Borrowings with original maturities of one year or less are classified as short-term. Securities sold under repurchase agreements are comprised of customer repurchase agreements, which are sweep accounts with next day maturities utilized by larger commercial customers to earn interest on their funds. Securities are pledged to these customers in an amount equal to the outstanding balance. Following is a summary of long-term borrowings: (in thousands) March 31, December 31, Federal Home Loan Bank advances $ 300,053 $ 310,061 Subordinated notes 89,523 87,614 Junior subordinated debt 110,466 110,347 Other subordinated debt 159,848 160,151 Total long-term borrowings $ 659,890 $ 668,173 Our banking affiliate has available credit with the FHLB of $7.8 billion , of which $1.9 billion was utilized as of March 31, 2018 . These advances are secured by loans collateralized by residential mortgages, home equity lines of credit, 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 1.39% to 4.19% for the three months ended March 31, 2018 and 0.95% to 4.19% for the year ended December 31, 2017 . The junior subordinated debt is comprised of the debt securities issued by FNB in relation to our unconsolidated subsidiary trusts (collectively, the Trusts), which are unconsolidated variable interest entities, and is included on the balance sheet in long-term borrowings. Since third-party investors are the primary beneficiaries, the Trusts are not consolidated in our financial statements. We record the distributions on the junior subordinated debt issued to the Trusts as interest expense. The following table provides information relating to the Trusts as of March 31, 2018 : (dollars in thousands) Trust Preferred Securities Common Securities Junior Subordinated Debt Stated Maturity Date Interest Rate Rate Reset Factor F.N.B. Statutory Trust II $ 21,500 $ 665 $ 22,165 6/15/2036 3.77 % LIBOR + 165 basis points (bps) Omega Financial Capital Trust I 26,000 1,114 26,483 10/18/2034 3.92 % LIBOR + 219 bps Yadkin Valley Statutory Trust I 25,000 774 20,925 12/15/2037 3.44 % LIBOR + 132 bps FNB Financial Services Capital Trust I 25,000 774 21,859 9/30/2035 3.79 % LIBOR + 146 bps American Community Capital Trust II 10,000 310 10,446 12/15/2033 5.11 % LIBOR + 280 bps Crescent Financial Capital Trust I 8,000 248 8,588 10/7/2033 4.82 % LIBOR + 310 bps Total $ 115,500 $ 3,885 $ 110,466

DERIVATIVE INSTRUMENTS AND HEDG

DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES	3 Months Ended
	Mar. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES	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 which are not offset in the balance sheet. March 31, 2018 December 31, 2017 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 $ 705,000 $ — $ 3,662 $ 705,000 $ 228 $ 1,982 Interest rate swaps – not designated 2,422,236 3,481 9,117 2,245,442 1,169 11,599 Equity contracts – not designated 1,180 26 — 1,180 51 — Total subject to master netting arrangements 3,128,416 3,507 12,779 2,951,622 1,448 13,581 Not subject to master netting arrangements: Interest rate swaps – not designated 2,422,236 15,176 38,787 2,245,442 27,233 15,303 Interest rate lock commitments – not designated 78,368 1,380 5 88,107 1,594 5 Forward delivery commitments – not designated 94,996 209 231 106,572 233 148 Credit risk contracts – not designated 206,747 20 64 235,196 39 109 Equity contracts – not designated 1,180 — 26 1,180 — 51 Total not subject to master netting arrangements 2,803,527 16,785 39,113 2,676,497 29,099 15,616 Total $ 5,931,943 $ 20,292 $ 51,892 $ 5,628,119 $ 30,547 $ 29,197 Beginning in the first quarter of 2017, certain derivative exchanges have 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 exposure and not collateral. This rule change became effective for us in the first quarter of 2017. Accordingly, we have changed our reporting of certain derivatives to record variation margin on trades cleared through exchanges that have adopted the rule change as settled where we had previously recorded cash collateral. The daily settlement of the derivative exposure does not change or reset the contractual terms of the instrument. Derivatives Designated as Hedging Instruments under GAAP Interest Rate Contracts. We entered into interest rate derivative agreements to modify the interest rate characteristics of certain commercial loans and five of our FHLB advances from variable rate to fixed rate in order to reduce the impact of changes in future cash flows due to market interest rate changes. These agreements are designated as cash flow hedges (i.e., hedging the exposure to variability in expected future cash flows). The effective portion of the derivative’s gain or loss is initially reported as a component of other comprehensive income and subsequently reclassified into earnings in the same line item associated with the forecasted transaction when the forecasted transaction affects earnings. Any ineffective portion of the gain or loss is reported in earnings immediately. Following is a summary of key data related to interest rate contracts: (in thousands) March 31, December 31, Notional amount $ 705,000 $ 705,000 Fair value included in other assets — 228 Fair value included in other liabilities 3,662 1,982 The following table shows amounts reclassified from accumulated other comprehensive income for the three months ended March 31, 2018 : (in thousands) Total Net of Tax Reclassified from AOCI to interest income $ 93 $ 73 Reclassified from AOCI to interest expense (129 ) (102 ) As of March 31, 2018 , the maximum length of time over which forecasted interest cash flows are hedged is 5 years. In the twelve months that follow March 31, 2018 , we expect to reclassify from the amount currently reported in AOCI net derivative gains of $3.2 million ( $2.5 million 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, and the addition of other hedges subsequent to March 31, 2018 . 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, 2018 and 2017 , there was no hedge ineffectiveness. Also, during the three months ended March 31, 2018 and 2017 , 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. We enter into interest rate swap agreements to meet the financing, interest rate and equity risk management needs of qualifying commercial loan customers. These agreements provide the customer the ability to convert from variable to fixed interest rates. The credit risk associated with derivatives executed with customers is essentially the same as that involved in extending loans and is subject to normal credit policies and monitoring. Swap derivative transactions with customers are not subject to enforceable master netting arrangements and are generally secured by rights to non-financial collateral, such as real and personal property. 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, December 31, Notional amount $ 4,844,472 $ 4,490,884 Fair value included in other assets 18,657 28,402 Fair value included in other liabilities 47,904 26,902 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 . Interest rate lock commitments represent an agreement to extend credit to a mortgage loan borrower, or an agreement to purchase a loan from a third-party originator, whereby the interest rate on the loan is set prior to funding. We are bound to fund the loan at a specified rate, regardless of whether interest rates have changed between the commitment date and the loan funding date, subject to the loan approval process. The borrower is not obligated to perform under the commitment. As such, outstanding IRLCs subject us to interest rate risk and related price risk during the period from the commitment to the borrower through the loan funding date, or commitment expiration. The IRLCs generally range between 30 to 270 days. The IRLCs are 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 mortgage banking operations income. Forward Delivery Commitments . Forward delivery commitments on mortgage-backed securities are used to manage the interest rate and price risk of our IRLCs and mortgage loan held for sale inventory by fixing the forward sale price that will be realized upon sale of the mortgage loans into the secondary market. Historical commitment-to-closing ratios are considered to estimate the quantity of mortgage loans that will fund within the terms of the IRLCs. The forward delivery contracts are 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 mortgage banking operations income. Credit Risk Contracts. We purchase and sell credit protection under risk participation agreements to share with other counterparties some of the credit exposure related to interest rate derivative contracts or to take on credit exposure to generate revenue. We will make/receive payments under these agreements if a customer defaults on their obligation to perform under certain derivative swap contracts. Risk participation agreements sold with notional amounts totaling $128.7 million as of March 31, 2018 have remaining terms ranging from three months to nine 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 $0.06 million and $0.1 million at March 31, 2018 and December 31, 2017 , respectively. The fair values of risk participation agreements purchased and sold were $0.02 million and $(0.06) million , respectively, at December 31, 2018 and $0.04 million and $(0.1) million , respectively at December 31, 2017 . Counterparty Credit Risk We are party to master netting arrangements with most of our swap derivative dealer 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 settled or 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 $0.6 million and $0.9 million as of March 31, 2018 and December 31, 2017 , respectively, in excess of amounts previously posted as collateral with the respective counterparty. 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 Balance Sheet (in thousands) Net Amount Presented in the Balance Sheet Financial Instruments Cash Collateral Net Amount March 31, 2018 Derivative Assets Interest rate contracts: Designated $ — $ — $ — $ — Not designated 3,481 3,451 — 30 Equity contracts – not designated 26 26 — — Total $ 3,507 $ 3,477 $ — $ 30 Derivative Liabilities Interest rate contracts: Designated $ 3,662 $ 3,662 $ — $ — Not designated 9,117 8,592 — 525 Total $ 12,779 $ 12,254 $ — $ 525 December 31, 2017 Derivative Assets Interest rate contracts: Designated $ 228 $ 228 $ — $ — Not designated 1,169 1,169 — — Equity contracts – not designated 51 51 — — Total $ 1,448 $ 1,448 $ — $ — Derivative Liabilities Interest rate contracts: Designated $ 1,982 $ 1,982 $ — $ — Not designated 11,599 10,940 — 659 Total $ 13,581 $ 12,922 $ — $ 659 The following table presents the effect of certain derivative financial instruments on the income statement: Three Months Ended (in thousands) Income Statement Location 2018 2017 Interest Rate Contracts Interest income - loans and leases $ 93 $ 506 Interest Rate Contracts Interest expense – short-term borrowings (129 ) 148 Interest Rate Swaps Other income (160 ) (219 ) Credit Risk Contracts Other income 27 19

COMMITMENTS, CREDIT RISK AND CO

COMMITMENTS, CREDIT RISK AND CONTINGENCIES	3 Months Ended
	Mar. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS, CREDIT RISK AND CONTINGENCIES	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 by the customer is represented by the contractual amount of those instruments. The credit risk associated with commitments to extend credit and standby letters of credit is essentially the same as that involved in extending loans and leases to customers and is subject to normal credit policies. Since many of these commitments expire without being drawn upon, the total commitment amounts do not necessarily represent future cash flow requirements. Following is a summary of off-balance sheet credit risk information: (in thousands) March 31, December 31, Commitments to extend credit $ 7,097,958 $ 6,957,822 Standby letters of credit 136,661 132,904 At March 31, 2018 , funding of 76.4% 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, and may be subject to 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 our 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, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
STOCK INCENTIVE PLANS	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 Plan (Plan). We issue time-based awards and performance-based awards under this Plan, 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. The assumptions used for this valuation include stock price volatility, risk-free interest rate and dividend yield. 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, regardless of the actual vesting percentages. As of March 31, 2018 , we had available up to 2,636,450 shares of common stock to issue under this Plan. 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, 2018 2017 Awards Weighted Average Grant Price per Share Awards Weighted Average Grant Price per Share Unvested awards outstanding at beginning of period 1,975,862 $ 13.64 1,836,363 $ 12.97 Vested (7,631 ) 12.83 (243,982 ) 11.83 Forfeited/expired (19,893 ) 14.02 (2,950 ) 13.00 Dividend reinvestment 16,373 14.37 12,253 14.54 Unvested awards outstanding at end of period 1,964,711 13.65 1,601,684 13.16 The following table provides certain information related to restricted stock awards: (in thousands) Three Months Ended 2018 2017 Stock-based compensation expense $ 1,939 $ 1,760 Tax benefit related to stock-based compensation expense 407 616 Fair value of awards vested 110 3,802 As of March 31, 2018 , there was $9.8 million of unrecognized compensation cost related to unvested restricted stock awards, including $0.6 million that is subject to accelerated vesting under the Plan’s immediate vesting upon retirement. The components of the restricted stock awards as of March 31, 2018 are as follows: (dollars in thousands) Service- Based Awards Performance- Based Awards Total Unvested restricted stock awards 1,050,062 914,649 1,964,711 Unrecognized compensation expense $ 5,691 $ 4,061 $ 9,752 Intrinsic value $ 14,123 $ 12,302 $ 26,425 Weighted average remaining life (in years) 1.76 1.50 1.64 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, 2018 2017 Shares Weighted Average Exercise Price per Share Shares Weighted Average Exercise Price per Share Options outstanding at beginning of period 722,650 $ 7.96 892,532 $ 8.95 Assumed from acquisitions — — 207,645 8.92 Exercised (163,035 ) 7.79 (131,792 ) 9.44 Forfeited/expired (237 ) 10.72 (49,281 ) 10.91 Options outstanding and exercisable at end of period 559,378 8.03 919,104 8.77 The intrinsic value of outstanding and exercisable stock options at March 31, 2018 was $3.0 million . The aggregate intrinsic value represents the amount by which the fair value of underlying stock exceeds the option exercise price.

RETIREMENT PLANS

RETIREMENT PLANS	3 Months Ended
	Mar. 31, 2018
Retirement Benefits [Abstract]
RETIREMENT PLANS	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 (in thousands) 2018 2017 401(k) contribution expense $ 3,610 $ 2,767 We also sponsor an Employee Retirement Income Security Act of 1974 (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 defined benefit pension plan and two supplemental non-qualified retirement plans that have been frozen. The net periodic benefit credit for these plans includes the following components: Three Months Ended (in thousands) 2018 2017 Service cost $ (4 ) $ (4 ) Interest cost 1,560 1,477 Expected return on plan assets (2,895 ) (2,427 ) Amortization: Unrecognized prior service cost — 2 Unrecognized loss 623 628 Net periodic pension credit $ (716 ) $ (324 )

INCOME TAXES

INCOME TAXES	3 Months Ended
	Mar. 31, 2018
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES The TCJA includes several changes to existing U.S. tax laws that impact us, most notably a reduction of the U.S. corporate income tax rate from 35% to 21% , which became effective January 1, 2018. We recognized the initial income tax effects of the TCJA in our 2017 financial statements in accordance with Staff Accounting Bulletin No. 118, which provides SEC staff guidance for the application of ASC 740, Income Taxes, in the reporting period in which the TCJA was signed into law. As such, our financial results reflect the income tax effects of the TCJA for which the accounting under ASC 740 is complete, as well as for provisional amounts for those specific income tax effects under ASC 740 that are incomplete, but a reasonable estimate could be determined. We did not identify any items for which the income tax effects of the TCJA have not been completed and a reasonable estimate could not be determined as of December 31, 2017, which was our first reporting date after the TCJA enactment. Examples of unavailable or unanalyzed information for which we have provisional estimates include deferred taxes related to depreciation (including lease financing), partnership earnings, and realized built-in losses from a prior acquisition. These estimates are subject to change as additional data is gathered, as interpretations and guidance are received, and as the final analyses are completed. The measurement period ends when we have analyzed the information necessary to finalize our accounting, but cannot extend beyond one year from the TCJA enactment date. Income Tax Expense Federal and state income tax expense and the statutory tax rate and the actual effective tax rate consist of the following: Three Months Ended (in thousands) 2018 2017 Current income taxes: Federal taxes $ 17,700 $ 6,688 State taxes 1,704 499 Total current income taxes 19,404 7,187 Deferred income taxes: Federal taxes 1,902 1,690 State taxes (38 ) (2,393 ) Total deferred income taxes 1,864 (703 ) Total income taxes $ 21,268 $ 6,484 Statutory tax rate 21.0 % 35.0 % Effective tax rate 19.7 % 22.0 % The effective tax rate for the quarter ended March 31, 2018 under the 21% TCJA statutory federal tax rate was 19.7% . The effective tax rate for the quarter ended March 31, 2017 under the former 35% statutory federal tax rate was 22.0% . The effective tax rate for the quarter ended March 31, 2018 was lower than the statutory tax rate of 21% due to tax benefits resulting from tax-exempt income on investments, loans, tax credits and income from BOLI. The lower effective tax rate for the quarter ended March 31, 2017 primarily related to merger expenses from the Yadkin acquisition. In the fourth quarter of 2017, we elected to change our accounting policy under ASU 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220) to reclassify the income tax effects related to the TCJA from AOCI to retained earnings. Deferred Income Taxes Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and tax purposes. Deferred tax assets and liabilities are measured based on the enacted tax rates that will apply in the years in which the temporary differences are expected to be recovered or paid. As such, during December 2017, we remeasured our deferred tax assets and liabilities as a result of the passage of the TCJA. The primary impact of this remeasurement was a reduction in deferred tax assets and liabilities in connection with the reduction of the U.S. corporate income tax rate from 35% to 21% .

OTHER COMPREHENSIVE INCOME

OTHER COMPREHENSIVE INCOME	3 Months Ended
	Mar. 31, 2018
Equity [Abstract]
OTHER COMPREHENSIVE INCOME	OTHER COMPREHENSIVE INCOME The following table presents changes in AOCI, net of tax, by component: (in thousands) Unrealized Net Losses on Debt Securities Available for Sale Unrealized Net Gains (Losses) on Derivative Instruments Unrecognized Pension and Postretirement Obligations Total Three Months Ended March 31, 2018 Balance at beginning of period $ (29,626 ) $ 5,407 $ (58,833 ) $ (83,052 ) Other comprehensive (loss) income before reclassifications (29,787 ) 3,804 484 (25,499 ) Amounts reclassified from AOCI — (173 ) — (173 ) Net current period other comprehensive (loss) income (29,787 ) 3,631 484 (25,672 ) Balance at end of period $ (59,413 ) $ 9,038 $ (58,349 ) $ (108,724 ) The amounts reclassified from AOCI related to debt 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 debt 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, 2018
Earnings Per Share [Abstract]
EARNINGS PER COMMON SHARE	EARNINGS PER COMMON SHARE Basic earnings per common share is calculated by dividing net income available to common stockholders by the weighted average number of shares of common stock outstanding net of unvested shares of restricted stock. Diluted earnings per common share is calculated by dividing net income available to common stockholders by the weighted average number of shares of common stock outstanding, adjusted for the dilutive effect of potential common shares issuable for stock options, warrants and restricted shares, as calculated using the treasury stock method. Adjustments to the weighted average number of shares of common stock outstanding are made only when such adjustments dilute earnings per common share. The following table sets forth the computation of basic and diluted earnings per common share: Three Months Ended ( dollars in thousands, except per share data) 2018 2017 Net income $ 86,762 $ 22,979 Less: Preferred stock dividends 2,010 2,010 Net income available to common stockholders $ 84,752 $ 20,969 Basic weighted average common shares outstanding 323,740,956 237,379,260 Net effect of dilutive stock options, warrants and restricted stock 2,026,012 1,882,423 Diluted weighted average common shares outstanding 325,766,968 239,261,683 Earnings per common share: Basic $ 0.26 $ 0.09 Diluted $ 0.26 $ 0.09 The following table shows the average shares excluded from the above calculation as their effect would have been anti-dilutive: Three Months Ended 2018 2017 Average shares excluded from the diluted earnings per common share calculation 21 81,755

CASH FLOW INFORMATION

CASH FLOW INFORMATION	3 Months Ended
	Mar. 31, 2018
Supplemental Cash Flow Elements [Abstract]
CASH FLOW INFORMATION	CASH FLOW INFORMATION Following is a summary of supplemental cash flow information: Three Months Ended 2018 2017 (in thousands) Interest paid on deposits and other borrowings $ 46,540 $ 18,606 Transfers of loans to other real estate owned 3,954 20,517

BUSINESS SEGMENTS

BUSINESS SEGMENTS	3 Months Ended
	Mar. 31, 2018
Segment Reporting [Abstract]
BUSINESS SEGMENTS	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 subsidiaries and eliminations and adjustments to reconcile to the Consolidated Financial Statements. (in thousands) Community Banking Wealth Management Insurance Consumer Finance Parent and Other Consolidated At or for the Three Months Ended March 31, 2018 Interest income $ 263,587 $ — $ 20 $ 9,294 $ 26 $ 272,927 Interest expense 42,360 — — 910 3,552 46,822 Net interest income 221,227 — 20 8,384 (3,526 ) 226,105 Provision for credit losses 12,412 — — 2,083 — 14,495 Non-interest income 53,312 11,002 4,303 638 (1,752 ) 67,503 Non-interest expense (1) 148,667 8,278 3,711 5,230 979 166,865 Amortization of intangibles 4,105 61 52 — — 4,218 Income tax expense (benefit) 21,720 589 124 474 (1,639 ) 21,268 Net income (loss) 87,635 2,074 436 1,235 (4,618 ) 86,762 Total assets 31,424,150 25,129 20,529 169,737 12,808 31,652,353 Total intangibles 2,315,127 10,128 12,075 1,809 — 2,339,139 At or for the Three Months Ended March 31, 2017 Interest income $ 185,381 $ — $ 20 $ 9,902 $ (610 ) $ 194,693 Interest expense 18,865 — — 922 2,154 21,941 Net interest income 166,516 — 20 8,980 (2,764 ) 172,752 Provision for credit losses 9,064 — — 1,786 — 10,850 Non-interest income 40,716 9,549 4,325 710 (184 ) 55,116 Non-interest expense (1) 168,283 7,540 3,315 5,231 88 184,457 Amortization of intangibles 2,982 61 55 — — 3,098 Income tax expense (benefit) 6,311 711 347 1,067 (1,952 ) 6,484 Net income (loss) 20,592 1,237 628 1,606 (1,084 ) 22,979 Total assets 29,978,061 22,130 20,514 184,006 (14,016 ) 30,190,695 Total intangibles 2,332,352 10,353 12,285 1,809 — 2,356,799 (1) Excludes amortization of intangibles, which is presented separately.

FAIR VALUE MEASUREMENTS

FAIR VALUE MEASUREMENTS	3 Months Ended
	Mar. 31, 2018
Fair Value Disclosures [Abstract]
FAIR VALUE MEASUREMENTS	FAIR VALUE MEASUREMENTS Refer to Note 24 "Fair Value Measurements" to the Consolidated Financial Statements of the Annual Report on Form 10-K for the year ended December 31, 2017 filed with the SEC on February 28, 2018 for a description of additional valuation methodologies for assets and liabilities measured at fair value on a recurring and non-recurring basis. Assets and liabilities measured at fair value rarely transfer between Level 1 and Level 2 measurements. There were no such transfers during the three-month periods ended March 31, 2018 and 2017. 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, 2018 Assets Measured at Fair Value Debt securities available for sale U.S. government-sponsored entities $ — $ 358,648 $ — $ 358,648 Residential mortgage-backed securities: Agency mortgage-backed securities — 1,671,573 — 1,671,573 Agency collateralized mortgage obligations — 832,350 — 832,350 Non-agency collateralized mortgage obligations — 1 — 1 Commercial mortgage-backed securities — 39,213 — 39,213 States of the U.S. and political subdivisions — 21,023 — 21,023 Other debt securities — 4,655 — 4,655 Total debt securities available for sale — 2,927,463 — 2,927,463 Loans held for sale — 21,610 — 21,610 Marketable equity securities Fixed income mutual fund 177 — — 177 Financial services industry — 944 — 944 Total marketable equity securities 177 944 — 1,121 Derivative financial instruments Trading — 18,683 — 18,683 Not for trading — 229 1,380 1,609 Total derivative financial instruments — 18,912 1,380 20,292 Total assets measured at fair value on a recurring basis $ 177 $ 2,968,929 $ 1,380 $ 2,970,486 Liabilities Measured at Fair Value Derivative financial instruments Trading $ — $ 47,930 $ — $ 47,930 Not for trading — 3,957 5 3,962 Total derivative financial instruments — 51,887 5 51,892 Total liabilities measured at fair value on a recurring basis $ — $ 51,887 $ 5 $ 51,892 (in thousands) Level 1 Level 2 Level 3 Total December 31, 2017 Assets Measured at Fair Value Debt securities available for sale U.S. government-sponsored entities $ — $ 343,942 $ — $ 343,942 Residential mortgage-backed securities: Agency mortgage-backed securities — 1,598,874 — 1,598,874 Agency collateralized mortgage obligations — 794,957 — 794,957 Non-agency collateralized mortgage obligations — 1 — 1 States of the U.S. and political subdivisions — 21,093 — 21,093 Other debt securities — 4,670 — 4,670 Total debt securities available for sale — 2,763,537 — 2,763,537 Equity securities available for sale Fixed income mutual fund 161 — — 161 Financial services industry — 864 — 864 Total equity securities available for sale 161 864 — 1,025 Total securities available for sale 161 2,764,401 — 2,764,562 Loans held for sale — 56,458 — 56,458 Derivative financial instruments Trading — 28,453 — 28,453 Not for trading — 500 1,594 2,094 Total derivative financial instruments — 28,953 1,594 30,547 Total assets measured at fair value on a recurring basis $ 161 $ 2,849,812 $ 1,594 $ 2,851,567 Liabilities Measured at Fair Value Derivative financial instruments Trading $ — $ 26,953 $ — $ 26,953 Not for trading — 2,239 5 2,244 Total derivative financial instruments — 29,192 5 29,197 Total liabilities measured at fair value on a recurring basis $ — $ 29,192 $ 5 $ 29,197 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 Securities Residential Non-Agency Collateralized Mortgage Obligations Interest Rate Lock Commitments Total Three Months Ended March 31, 2018 Balance at beginning of period $ — $ — $ — $ 1,594 $ 1,594 Purchases, issuances, sales and settlements: Purchases — — — 1,380 1,380 Settlements — — — (1,594 ) (1,594 ) Balance at end of period $ — $ — $ — $ 1,380 $ 1,380 Year Ended December 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 — — 1,594 13,642 Sales/redemptions (12,047 ) — (874 ) — (12,921 ) Settlements — — (19 ) (4,569 ) (4,588 ) Transfers from Level 3 — (578 ) — — (578 ) Transfers into Level 3 — — — 4,569 4,569 Balance at end of period $ — $ — $ — $ 1,594 $ 1,594 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. There were no transfers of assets or liabilities between the hierarchy levels during the first three months of 2018. During the first quarter of 2017, we acquired $12.0 million in other debt securities from YDKN that are measured at Level 3. These securities were sold during the second quarter of 2017. During the first three months of 2017, we transferred equity securities totaling $0.6 million from Level 3 to Level 2, as a result of increased trading activity relating to these securities. For the three months ended March 31, 2018 , we recorded in earnings $0.5 million of unrealized gains relating to the adoption of ASU 2016-01 and market value adjustments on marketable equity securities. These unrealized gains included in earnings are in the other non-interest income line item in the consolidated statement of income. For the three months ended March 31, 2017 , 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 realized net securities gains included in earnings are in the net securities 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 basis. These adjustments to fair value usually result from the application of the lower of cost or fair value accounting or write-downs of individual assets. Valuation methodologies used to measure these fair value adjustments were described in Note 24 "Fair Value Measurements" in our 2017 Form 10-K. For assets measured at fair value on a non-recurring basis still held at the balance sheet date, the following table provides the hierarchy level and the fair value of the related assets or portfolios: (in thousands) Level 1 Level 2 Level 3 Total March 31, 2018 Impaired loans $ — $ 2,032 $ 1,475 $ 3,507 Other real estate owned — — 1,621 1,621 Other assets - SBA servicing asset — — 5,062 5,062 December 31, 2017 Impaired loans $ — $ 2,813 $ 1,297 $ 4,110 Other real estate owned — 10,513 10,823 21,336 Loans held for sale - SBA — — 36,432 36,432 Other assets - SBA servicing asset — — 5,058 5,058 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, 2018 and December 31, 2017 , respectively. Consequently, the fair value information presented is not necessarily as of the period’s end. Impaired loans measured or re-measured at fair value on a non-recurring basis during the three months ended March 31, 2018 had a carrying amount of $3.5 million , which includes an allocated allowance for credit losses of $3.2 million . The allowance for credit losses includes a provision applicable to the current period fair value measurements of $2.7 million , which was included in the provision for credit losses for the three months ended March 31, 2018 . OREO with a carrying amount of $2.0 million was written down to $1.6 million , resulting in a loss of $0.4 million , which was included in earnings for the three months ended March 31, 2018 . Fair Value of Financial Instruments The following methods and assumptions were used to estimate the fair value of each financial instrument: Cash and Cash Equivalents, Accrued Interest Receivable and Accrued Interest Payable. For these short-term instruments, the carrying amount is a reasonable estimate of fair value. Securities. For both securities AFS and securities HTM, fair value equals the quoted market price from an active market, if available, and is classified within Level 1. If a quoted market price is not available, fair value is estimated using quoted market prices for similar securities or pricing models, and is classified as Level 2. Where there is limited market activity or significant valuation inputs are unobservable, securities are classified within Level 3. Under current market conditions, assumptions used to determine the fair value of Level 3 securities have greater subjectivity due to the lack of observable market transactions. Loans and Leases. The fair value of fixed rate loans and leases is estimated by discounting the future cash flows using the current rates at which similar loans and leases would be made to borrowers with similar credit ratings and for the same remaining maturities less an illiquidity discount, as the fair value measurement represents an exit price from a market participants' viewpoint. The fair value of variable and adjustable rate loans and leases approximates the carrying amount. Due to the significant judgment involved in evaluating credit quality, loans and leases are classified within Level 3 of the fair value hierarchy. Loan Servicing Rights . For both MSRs and SBA servicing rights, both classified as Level 3 assets, fair value is determined using a discounted cash flow valuation method. These models use significant unobservable inputs including discount rates, prepayment rates and cost to service which have greater subjectivity due to the lack of observable market transactions. Derivative Assets and Liabilities. See Note 24 "Fair Value Measurements" to the Consolidated Financial Statements of the Annual Report on Form 10-K for the year ended December 31, 2017 filed with the SEC on February 28, 2018 for a description of valuation methodologies for derivative assets and liabilities measured at fair value. Deposits. The estimated fair value of demand deposits, savings accounts and certain money market deposits is the amount payable on demand at the reporting date because of the customers’ ability to withdraw funds immediately. The fair value of fixed-maturity deposits is estimated by discounting future cash flows using rates currently offered for deposits of similar remaining maturities. Short-Term Borrowings. The carrying amounts for short-term borrowings approximate fair value for amounts that mature in 90 days or less. The fair value of subordinated notes is estimated by discounting future cash flows using rates currently offered. Long-Term Borrowings. The fair value of long-term borrowings is estimated by discounting future cash flows based on the market prices for the same or similar issues or on the current rates offered to us for debt of the same remaining maturities. Loan Commitments and Standby Letters of Credit. Estimates of the fair value of these off-balance sheet items were not made because of the short-term nature of these arrangements and the credit standing of the counterparties. Also, unfunded loan commitments relate principally to variable rate commercial loans, typically are non-binding, and fees are not normally assessed on these balances. Nature of Estimates . Many of the estimates presented herein are based upon the use of highly subjective information and assumptions and, accordingly, the results may not be precise. Management believes that fair value estimates may not be comparable to other financial institutions due to the wide range of permitted valuation techniques and numerous estimates which must be made. Further, because the disclosed fair value amounts were estimated as of the balance sheet date, the amounts actually realized or paid upon maturity or settlement of the various financial instruments could be significantly different. The fair values of our financial instruments are as follows: Fair Value Measurements (in thousands) Carrying Amount Fair Value Level 1 Level 2 Level 3 March 31, 2018 Financial Assets Cash and cash equivalents $ 386,329 $ 386,329 $ 386,329 $ — $ — Debt securities available for sale 2,927,463 2,927,463 — 2,927,463 — Debt securities held to maturity 3,224,000 3,131,964 — 3,131,964 — Net loans and leases, including loans held for sale 21,121,132 20,900,639 — 21,610 20,879,029 Loan servicing rights 35,853 41,878 — — 41,878 Marketable equity securities 1,121 1,121 177 944 — Derivative assets 20,292 20,292 — 18,912 1,380 Accrued interest receivable 95,082 95,082 95,082 — — Financial Liabilities Deposits 22,497,089 22,441,017 17,755,830 4,685,187 — Short-term borrowings 3,802,480 3,802,988 3,802,988 — — Long-term borrowings 659,890 663,085 — — 663,085 Derivative liabilities 51,892 51,892 — 51,887 5 Accrued interest payable 12,762 12,762 12,762 — — December 31, 2017 Financial Assets Cash and cash equivalents $ 479,443 $ 479,443 $ 479,443 $ — $ — Securities available for sale 2,764,562 2,764,562 161 2,764,401 — Debt securities held to maturity 3,242,268 3,218,379 — 3,218,379 — Net loans and leases, including loans held for sale 20,916,277 20,661,196 — 56,458 20,604,738 Loan servicing rights 34,111 37,758 — — 37,758 Derivative assets 30,547 30,547 — 28,953 1,594 Accrued interest receivable 94,254 94,254 94,254 — — Financial Liabilities Deposits 22,399,725 22,359,182 17,779,246 4,579,936 — Short-term borrowings 3,678,337 3,678,723 3,678,723 — — Long-term borrowings 668,173 675,489 — — 675,489 Derivative liabilities 29,197 29,197 — 29,192 5 Accrued interest payable 12,480 12,480 12,480 — —

SUMMARY OF SIGNIFICANT ACCOUN29

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	3 Months Ended
	Mar. 31, 2018
Accounting Policies [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, 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. 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, 2018 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. 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 unaudited Consolidated Financial Statements should be read in conjunction with the audited Consolidated Financial Statements and Notes thereto included in FNB’s 2017 Annual Report on Form 10-K filed with the SEC on February 28, 2018 . For a detailed description of our significant accounting policies, see Note 1 "Summary of Significant Accounting Policies" in the 2017 Form 10-K. The accounting policies presented below have been added or amended for newly material items or the adoption of new accounting standards.
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, income taxes and deferred tax assets and litigation.
Revenue from Contracts with Customers	Revenue from Contracts with Customers We earn certain revenues from contracts with customers. These revenues are recognized when control of the promised services is transferred to the customers in an amount that reflects the consideration we expect to be entitled to in an exchange for those services. In determining the appropriate revenue recognition for our contracts with customers, we consider whether the contract has commercial substance and is approved by both parties with identifiable contractual rights, payment terms, and the collectability of consideration is probable. Generally, we satisfy our performance obligations upon the completion of services at the amount to which we have the right to invoice or charge under contracts with an original expected duration of one year or less. We apply this guidance on a portfolio basis to contracts with similar characteristics and for which we believe the results would not differ materially from applying this guidance to individual contracts. Our services provided under contracts with customers are transferred at the point in time when the services are rendered. Generally, we do not defer incremental direct costs to obtain contracts with customers that would be amortized in one year or less under the practical expedient. These costs are recognized as expense, primarily salary and benefit expense, in the period incurred. Deposit Services . We recognize revenue on deposit services based on published fees for services provided. Demand and savings deposit customers have the right to cancel their depository arrangements and withdraw their deposited funds at any time without prior notice. When services involve deposited funds that can be retrieved by customers without penalties, we consider the service contract term to be day-to-day, where each day represents the renewal of the contract. The contract does not extend beyond the services performed and revenue is recognized at the end of the contract term (daily) as the performance obligation is satisfied. No deposit services fees exist for long-term deposit products beyond early withdrawal penalties, which are earned on these products at the time of early termination. Revenue from deposit services fees are reduced where we have a history of waived or reduced fees by customer request or due to a customer service issue, by historical experience, or another acceptable method in the same period as the related revenues. Revenues from deposit services are reported in the Consolidated Statements of Income as service charges and in the Community Banking segment as non-interest income. Wealth Management Services. Wealth advisory and trust services are provided on a month-to-month basis and invoiced as services are rendered. Fees are based on a fixed amount or a scale based on the level of services provided or assets under management. The customer has the right to terminate their services agreement at any time. We determine the value of services performed based on the fee schedule in effect at the time the services are performed. Revenues from wealth advisory and trust services are reported in the Consolidated Statements of Income as trust services and securities commissions and fees, and in the Wealth segment as non-interest income. Insurance Services. Insurance services include full-service insurance brokerage services offering numerous lines of commercial and personal insurance through major carriers to businesses and individuals within our geographic markets. We recognize revenue on insurance contracts in effect based on contractually specified commission payments on premiums that are paid by the customer to the insurance carrier. Contracts are cancellable at any time and we have no performance obligation to the customers beyond the time the insurance is placed into effect. Revenues from insurance services are reported in the Consolidated Statements of Income as insurance commissions and fees, and in the Insurance segment as non-interest income.
Debt Securities	Debt Securities Debt securities comprise a significant portion of our Consolidated Balance Sheets. Such securities can be classified as trading, HTM or AFS. As of March 31, 2018 and 2017 , we did not hold any trading debt securities. Debt securities HTM are the securities that management has the positive intent and ability to hold until their maturity. Such securities are carried at cost, adjusted for related amortization of premiums and accretion of discounts through interest income from securities, and subject to evaluation for OTTI. Debt securities that are not classified as trading or HTM are classified as AFS. Such securities are carried at fair value with net unrealized gains and losses deemed to be temporary and OTTI attributable to non-credit factors reported separately as a component of other comprehensive income, net of tax. We evaluate our debt securities in a loss position for OTTI on a quarterly basis at the individual security level based on our intent to sell. If we intend to sell the debt security or it is more likely than not we will be required to sell the security before recovery of its amortized cost basis, OTTI must be recognized in earnings equal to the entire difference between the investments’ amortized cost basis and its fair value. If we do not intend to sell the debt security and it is not more likely than not that we will be required to sell the security before recovery of its amortized cost basis, OTTI must be separated into the amount representing credit loss and the amount related to all other market factors. The amount related to credit loss will be recognized in earnings. The amount related to other market factors will be recognized in other comprehensive income, net of applicable taxes. We perform our OTTI evaluation process in a consistent and systematic manner and include an evaluation of all available evidence. This process considers factors such as length of time and anticipated recovery period of the impairment, recent events specific to the issuer and recent experience regarding principal and interest payments.
Low Income Housing Tax Credit Partnerships	Low Income Housing Tax Credit (LIHTC) Partnerships We invest in various affordable housing projects that qualify for LIHTCs. The net 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.
New Accounting Standards	Standard Description Required Date of Adoption Financial Statements Impact Derivative and Hedging Activities ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities This Update improves the financial reporting of hedging to better align with a company’s risk management activities. In addition, this Update makes certain targeted improvements to simplify the application of the current hedge accounting guidance. January 1, 2019 Early adoption is permitted. This Update is to be applied using a modified retrospective method. The presentation and disclosure guidance are applied prospectively. We are currently assessing the potential impact to our Consolidated Financial Statements. Securities ASU 2017-08, Receivables-Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities This Update shortens the amortization period for the premium on certain purchased callable securities to the earliest call date. The accounting for purchased callable debt securities held at a discount does not change. January 1, 2019 Early adoption is permitted. This Update is to be applied using a modified retrospective transition method. The adoption of this Update is not expected to have a material effect on our Consolidated Financial Statements. Standard Description Required Date of Adoption Financial Statements Impact Retirement Benefits ASU 2017-07, Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost This Update requires that an employer disaggregate the service cost component from the other components of net benefit cost. The amendments also provide explicit guidance on how to present the service cost component and the other components of net benefit cost in the income statement and allows only the service cost component of net benefit cost to be eligible for capitalization. January 1, 2018 We adopted this Update in the first quarter of 2018 by a retrospective transition method. The adoption of this Update did not have a material effect on our Consolidated Financial Statements. 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) This Update adds or clarifies guidance on eight cash flow issues. January 1, 2018 We adopted this Update in the first quarter of 2018 by retrospective application. The adoption of this Update did not have a material effect on our Consolidated Financial Statements. Credit Losses ASU 2016-13 , Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments This Update replaces the current incurred loss impairment methodology with a methodology that reflects current expected credit losses (commonly referred to as CECL) for most financial assets measured at amortized cost and certain other instruments, including loans, HTM debt securities, net investments in leases and off-balance sheet credit exposures. CECL requires loss estimates for the remaining life of the financial asset at the time the asset is originated or acquired, considering historical experience, current conditions and reasonable and supportable forecasts. In addition, the Update will require the use of a modified AFS debt security impairment model and eliminate the current accounting for purchased credit impaired loans and debt securities. January 1, 2020 Early adoption is permitted for fiscal years beginning after December 15, 2018 This Update is to be applied using a cumulative-effect adjustment to retained earnings. The CECL model is a significant change from existing GAAP and may result in a material change to our accounting for financial instruments. We are reviewing our business processes, information systems and controls to support recognition and disclosures under this Update. This review includes an assessment of our existing credit models and the financial statement disclosure requirements. The impact of this Update will be dependent on the portfolio composition, credit quality and economic conditions at the time of adoption. Extinguishments of Liabilities ASU 2016-04, Liabilities - Extinguishments of Liabilities (Subtopic 405-20): Recognition of Breakage for Certain Prepaid Stored-Value Products (a consensus of the Emerging Issues Task Force) This Update requires entities that sell prepaid stored-value products redeemable for goods, services or cash at third-party merchants to recognize breakage. January 1, 2018 We adopted this Update in the first quarter of 2018. The adoption of this Update did not have a material effect on our Consolidated Financial Statements. Standard Description Required Date of Adoption Financial Statements Impact Leases ASU 2016-02, Leases (Topic 842) This Update requires lessees to put most leases on their balance sheets but recognize expenses in the income statement similar to current accounting. In addition, the Update changes the guidance for sale-leaseback transactions, initial direct costs and lease executory costs for most entities. All entities will classify leases to determine how to recognize lease related revenue and expense. January 1, 2019 Early adoption is permitted. This Update is to be applied using a modified retrospective application including a number of optional practical expedients. We are in the process of reviewing our existing lease portfolios, implementing a software solution and assessing the potential impact to our Consolidated Financial Statements. Financial Instruments – Recognition and Measurement ASU 2016-01, Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities This Update amends the presentation and accounting for certain financial instruments, including liabilities measured at fair value under the FVO, and equity investments. The guidance also updates fair value presentation and disclosure requirements for financial instruments measured at amortized cost. January 1, 2018 We adopted this Update in the first quarter of 2018 by a cumulative-effect adjustment. The adoption of this Update did not have a material effect on our Consolidated Financial Statements. During the first quarter of 2018, we transferred marketable equity securities totaling $1.1 million from securities AFS to other assets. Revenue Recognition ASU 2014-09, Revenue from Contracts with Customers (Topic 606) This Update modifies the guidance used to recognize revenue from contracts with customers for transfers of goods and services and transfers of nonfinancial assets, unless those contracts are within the scope of other guidance. The guidance also requires new qualitative and quantitative disclosures about contract balances and performance obligations. January 1, 2018 We adopted this Update in the first quarter of 2018 under the modified retrospective method. The adoption of this Update did not have a material effect on our Consolidated Financial Statements.

SECURITIES (Tables)

SECURITIES (Tables)	3 Months Ended
	Mar. 31, 2018
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 Unrealized Gains Gross Unrealized Losses Fair Value Securities Available for Sale: March 31, 2018 U.S. government-sponsored entities $ 364,600 $ — $ (5,952 ) $ 358,648 Residential mortgage-backed securities: Agency mortgage-backed securities 1,713,036 458 (41,921 ) 1,671,573 Agency collateralized mortgage obligations 860,902 28 (28,580 ) 832,350 Non-agency collateralized mortgage obligations 1 — — 1 Commercial mortgage-backed securities 39,183 30 — 39,213 States of the U.S. and political subdivisions 21,138 3 (118 ) 21,023 Other debt securities 4,916 — (261 ) 4,655 Total debt securities available for sale $ 3,003,776 $ 519 $ (76,832 ) $ 2,927,463 December 31, 2017 U.S. government-sponsored entities $ 347,767 $ 52 $ (3,877 ) $ 343,942 Residential mortgage-backed securities: Agency mortgage-backed securities 1,615,168 1,225 (17,519 ) 1,598,874 Agency collateralized mortgage obligations 813,034 — (18,077 ) 794,957 Non-agency collateralized mortgage obligations 1 — — 1 States of the U.S. and political subdivisions 21,151 6 (64 ) 21,093 Other debt securities 4,913 — (243 ) 4,670 Total debt securities 2,802,034 1,283 (39,780 ) 2,763,537 Equity securities 587 438 — 1,025 Total securities available for sale $ 2,802,621 $ 1,721 $ (39,780 ) $ 2,764,562
Schedule of Amortized Cost and Fair Value of Securities Held to Maturity	(in thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Debt Securities Held to Maturity: March 31, 2018 U.S. Treasury $ 500 $ 114 $ — $ 614 U.S. government-sponsored entities 247,272 81 (5,716 ) 241,637 Residential mortgage-backed securities: Agency mortgage-backed securities 1,174,426 491 (27,472 ) 1,147,445 Agency collateralized mortgage obligations 783,151 257 (29,971 ) 753,437 Commercial mortgage-backed securities 79,476 32 (1,245 ) 78,263 States of the U.S. and political subdivisions 939,175 2,483 (31,090 ) 910,568 Total debt securities held to maturity $ 3,224,000 $ 3,458 $ (95,494 ) $ 3,131,964 December 31, 2017 U.S. Treasury $ 500 $ 134 $ — $ 634 U.S. government-sponsored entities 247,310 93 (4,388 ) 243,015 Residential mortgage-backed securities: Agency mortgage-backed securities 1,219,802 3,475 (9,058 ) 1,214,219 Agency collateralized mortgage obligations 777,146 32 (20,095 ) 757,083 Commercial mortgage-backed securities 80,786 414 (575 ) 80,625 States of the U.S. and political subdivisions 916,724 13,209 (7,130 ) 922,803 Total debt securities held to maturity $ 3,242,268 $ 17,357 $ (41,246 ) $ 3,218,379
Gross Gains and Gross Losses Realized on Sales of Securities	Gross gains and gross losses were realized on securities as follows: Three Months Ended (in thousands) 2018 2017 Gross gains $ — $ 3,400 Gross losses — (775 ) Net gains $ — $ 2,625
Amortized Cost and Fair Value of Securities, by Contractual Maturities	As of March 31, 2018 , the amortized cost and fair value of debt securities, by contractual maturities, were as follows: Available for Sale Held to Maturity (in thousands) Amortized Cost Fair Value Amortized Cost Fair Value Due in one year or less $ 65,814 $ 65,498 $ 45,461 $ 45,221 Due from one to five years 262,236 256,811 210,014 204,580 Due from five to ten years 7,876 7,725 94,022 93,225 Due after ten years 54,728 54,292 837,450 809,793 390,654 384,326 1,186,947 1,152,819 Residential mortgage-backed securities: Agency mortgage-backed securities 1,713,036 1,671,573 1,174,426 1,147,445 Agency collateralized mortgage obligations 860,902 832,350 783,151 753,437 Non-agency collateralized mortgage obligations 1 1 — — Commercial mortgage-backed securities 39,183 39,213 79,476 78,263 Total debt securities $ 3,003,776 $ 2,927,463 $ 3,224,000 $ 3,131,964
Schedule of Securities Pledged as Collateral	Following is information relating to securities pledged: (dollars in thousands) March 31, December 31, Securities pledged (carrying value): To secure public deposits, trust deposits and for other purposes as required by law $ 3,532,023 $ 3,491,634 As collateral for short-term borrowings 298,233 263,756 Securities pledged as a percent of total securities 62.3 % 62.5 %
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 temporarily impaired debt securities, segregated by length of impairment: Less than 12 Months 12 Months or More Total (dollars in thousands) # Fair Value Unrealized Losses # Fair Value Unrealized Losses # Fair Value Unrealized Losses Debt Securities Available for Sale March 31, 2018 U.S. government-sponsored entities 8 $ 158,212 $ (1,389 ) 10 $ 200,436 $ (4,563 ) 18 $ 358,648 $ (5,952 ) Residential mortgage-backed securities: Agency mortgage-backed securities 59 1,212,767 (25,545 ) 28 444,583 (16,376 ) 87 1,657,350 (41,921 ) Agency collateralized mortgage obligations 16 470,878 (13,274 ) 33 312,687 (15,306 ) 49 783,565 (28,580 ) States of the U.S. and political subdivisions 7 11,434 (108 ) 1 877 (10 ) 8 12,311 (118 ) Other debt securities — — — 3 4,655 (261 ) 3 4,655 (261 ) Total temporarily impaired debt securities AFS 90 $ 1,853,291 $ (40,316 ) 75 $ 963,238 $ (36,516 ) 165 $ 2,816,529 $ (76,832 ) December 31, 2017 U.S. government-sponsored entities 7 $ 106,809 $ (363 ) 10 $ 201,485 $ (3,514 ) 17 $ 308,294 $ (3,877 ) Residential mortgage-backed securities: Agency mortgage-backed securities 43 976,738 (7,723 ) 28 473,625 (9,796 ) 71 1,450,363 (17,519 ) Agency collateralized mortgage obligations 14 409,005 (6,231 ) 33 335,452 (11,846 ) 47 744,457 (18,077 ) States of the U.S. and political subdivisions 7 11,254 (55 ) 1 879 (9 ) 8 12,133 (64 ) Other debt securities — — — 3 4,670 (243 ) 3 4,670 (243 ) Total temporarily impaired debt securities AFS 71 $ 1,503,806 $ (14,372 ) 75 $ 1,016,111 $ (25,408 ) 146 $ 2,519,917 $ (39,780 ) Less than 12 Months 12 Months or More Total (dollars in thousands) # Fair Value Unrealized Losses # Fair Value Unrealized Losses # Fair Value Unrealized Losses Debt Securities Held to Maturity March 31, 2018 U.S. government-sponsored entities 4 $ 54,558 $ (465 ) 10 $ 184,750 $ (5,251 ) 14 $ 239,308 $ (5,716 ) Residential mortgage-backed securities: Agency mortgage-backed securities 73 935,246 (20,410 ) 11 173,759 (7,062 ) 84 1,109,005 (27,472 ) Agency collateralized mortgage obligations 16 267,299 (5,862 ) 35 444,572 (24,109 ) 51 711,871 (29,971 ) Commercial mortgage-backed securities 6 48,737 (637 ) 3 19,909 (608 ) 9 68,646 (1,245 ) States of the U.S. and political subdivisions 148 517,101 (16,245 ) 37 112,879 (14,845 ) 185 629,980 (31,090 ) Total temporarily impaired debt securities HTM 247 $ 1,822,941 $ (43,619 ) 96 $ 935,869 $ (51,875 ) 343 $ 2,758,810 $ (95,494 ) December 31, 2017 U.S. government-sponsored entities 4 $ 54,790 $ (239 ) 10 $ 185,851 $ (4,149 ) 14 $ 240,641 $ (4,388 ) Residential mortgage-backed securities: Agency mortgage-backed securities 36 648,485 (4,855 ) 11 183,989 (4,203 ) 47 832,474 (9,058 ) Agency collateralized mortgage obligations 14 275,290 (1,701 ) 35 473,257 (18,394 ) 49 748,547 (20,095 ) Commercial mortgage-backed securities 3 26,399 (123 ) 2 19,443 (452 ) 5 45,842 (575 ) States of the U.S. and political subdivisions 16 56,739 (933 ) 37 121,536 (6,197 ) 53 178,275 (7,130 ) Total temporarily impaired debt securities HTM 73 $ 1,061,703 $ (7,851 ) 95 $ 984,076 $ (33,395 ) 168 $ 2,045,779 $ (41,246 )

LOANS AND LEASES (Tables)

LOANS AND LEASES (Tables)	3 Months Ended
	Mar. 31, 2018
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 Leases March 31, 2018 Commercial real estate $ 5,465,150 $ 3,346,325 $ 8,811,475 Commercial and industrial 3,688,120 591,849 4,279,969 Commercial leases 279,582 — 279,582 Other 39,347 — 39,347 Total commercial loans and leases 9,472,199 3,938,174 13,410,373 Direct installment 1,737,242 134,397 1,871,639 Residential mortgages 2,131,338 630,763 2,762,101 Indirect installment 1,524,330 171 1,524,501 Consumer lines of credit 1,135,488 558,295 1,693,783 Total consumer loans 6,528,398 1,323,626 7,852,024 Total loans and leases, net of unearned income $ 16,000,597 $ 5,261,800 $ 21,262,397 December 31, 2017 Commercial real estate $ 5,174,783 $ 3,567,081 $ 8,741,864 Commercial and industrial 3,495,247 675,420 4,170,667 Commercial leases 266,720 — 266,720 Other 17,063 — 17,063 Total commercial loans and leases 8,953,813 4,242,501 13,196,314 Direct installment 1,755,713 149,822 1,905,535 Residential mortgages 2,036,226 666,465 2,702,691 Indirect installment 1,448,268 165 1,448,433 Consumer lines of credit 1,151,470 594,323 1,745,793 Total consumer loans 6,391,677 1,410,775 7,802,452 Total loans and leases, net of unearned income $ 15,345,490 $ 5,653,276 $ 20,998,766
Certain Information Relating to Commercial Real Estate Loans	The following table shows certain information relating to commercial real estate loans: (dollars in thousands) March 31, December 31, Commercial construction, acquisition and development loans $ 1,167,699 $ 1,170,175 Percent of total loans and leases 5.5 % 5.6 % Commercial real estate: Percent owner-occupied 35.2 % 35.3 % Percent non-owner-occupied 64.8 % 64.7 %
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, December 31, Accounted for under ASC 310-30: Outstanding balance $ 4,853,516 $ 5,176,015 Carrying amount 4,521,926 4,834,256 Accounted for under ASC 310-20: Outstanding balance 754,251 835,130 Carrying amount 733,037 812,322 Total acquired loans: Outstanding balance 5,607,767 6,011,145 Carrying amount 5,254,963 5,646,578
Summary of Change in Accretable Yield of Acquired Loans	The following table provides changes in accretable yield for all acquired loans accounted for under ASC 310-30. Loans accounted for under ASC 310-20 are not included in this table. Three Months Ended (in thousands) 2018 2017 Balance at beginning of period $ 708,481 $ 467,070 Acquisitions — 443,261 Reduction due to unexpected early payoffs (25,833 ) (20,560 ) Reclass from non-accretable difference 64,216 23,106 Disposals/transfers (57 ) (36 ) Other (403 ) — Accretion (59,079 ) (25,241 ) Balance at end of period $ 687,325 $ 887,600
Summary of Non-Performing Assets	Following is a summary of non-performing assets: (dollars in thousands) March 31, December 31, Non-accrual loans $ 77,684 $ 74,635 Troubled debt restructurings 24,452 23,481 Total non-performing loans 102,136 98,116 Other real estate owned 40,980 40,606 Total non-performing assets $ 143,116 $ 138,722 Asset quality ratios: Non-performing loans / total loans and leases 0.48 % 0.47 % Non-performing loans + OREO / total loans and leases + OREO 0.67 % 0.66 % Non-performing assets / total assets 0.45 % 0.44 %
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 > 90 Days Past Due and Still Accruing Non- Accrual Total Past Due Current Total Loans and Leases Originated Loans and Leases March 31, 2018 Commercial real estate $ 8,345 $ 1 $ 27,349 $ 35,695 $ 5,429,455 $ 5,465,150 Commercial and industrial 6,793 3 19,705 26,501 3,661,619 3,688,120 Commercial leases 692 — 1,399 2,091 277,491 279,582 Other 183 73 1,000 1,256 38,091 39,347 Total commercial loans and leases 16,013 77 49,453 65,543 9,406,656 9,472,199 Direct installment 8,129 3,913 8,411 20,453 1,716,789 1,737,242 Residential mortgages 14,870 1,982 5,254 22,106 2,109,232 2,131,338 Indirect installment 6,850 511 2,234 9,595 1,514,735 1,524,330 Consumer lines of credit 4,550 821 2,769 8,140 1,127,348 1,135,488 Total consumer loans 34,399 7,227 18,668 60,294 6,468,104 6,528,398 Total originated loans and leases $ 50,412 $ 7,304 $ 68,121 $ 125,837 $ 15,874,760 $ 16,000,597 December 31, 2017 Commercial real estate $ 8,273 $ 1 $ 24,773 $ 33,047 $ 5,141,736 $ 5,174,783 Commercial and industrial 8,948 3 17,077 26,028 3,469,219 3,495,247 Commercial leases 1,382 41 1,574 2,997 263,723 266,720 Other 83 153 1,000 1,236 15,827 17,063 Total commercial loans and leases 18,686 198 44,424 63,308 8,890,505 8,953,813 Direct installment 13,192 4,466 8,896 26,554 1,729,159 1,755,713 Residential mortgages 14,096 2,832 5,771 22,699 2,013,527 2,036,226 Indirect installment 10,313 611 2,240 13,164 1,435,104 1,448,268 Consumer lines of credit 5,859 1,014 2,313 9,186 1,142,284 1,151,470 Total consumer loans 43,460 8,923 19,220 71,603 6,320,074 6,391,677 Total originated loans and leases $ 62,146 $ 9,121 $ 63,644 $ 134,911 $ 15,210,579 $ 15,345,490 (in thousands) 30-89 Days Past Due > 90 Days Past Due and Still Accruing Non- Accrual Total Past Due (1) (2) Current (Discount) Premium Total Loans Acquired Loans March 31, 2018 Commercial real estate $ 32,697 $ 64,550 $ 3,735 $ 100,982 $ 3,433,231 $ (187,888 ) $ 3,346,325 Commercial and industrial 5,135 4,617 4,652 14,404 612,354 (34,909 ) 591,849 Total commercial loans 37,832 69,167 8,387 115,386 4,045,585 (222,797 ) 3,938,174 Direct installment 2,826 1,746 — 4,572 128,754 1,071 134,397 Residential mortgages 15,113 13,059 — 28,172 642,966 (40,375 ) 630,763 Indirect installment — 1 — 1 7 163 171 Consumer lines of credit 5,357 2,139 1,176 8,672 561,906 (12,283 ) 558,295 Total consumer loans 23,296 16,945 1,176 41,417 1,333,633 (51,424 ) 1,323,626 Total acquired loans $ 61,128 $ 86,112 $ 9,563 $ 156,803 $ 5,379,218 $ (274,221 ) $ 5,261,800 December 31, 2017 Commercial real estate $ 34,928 $ 63,092 $ 3,975 $ 101,995 $ 3,657,152 $ (192,066 ) $ 3,567,081 Commercial and industrial 3,187 6,452 5,663 15,302 698,265 (38,147 ) 675,420 Total commercial loans 38,115 69,544 9,638 117,297 4,355,417 (230,213 ) 4,242,501 Direct installment 5,267 2,013 — 7,280 141,386 1,156 149,822 Residential mortgages 17,191 15,139 — 32,330 675,499 (41,364 ) 666,465 Indirect installment — 1 — 1 10 154 165 Consumer lines of credit 6,353 3,253 1,353 10,959 596,298 (12,934 ) 594,323 Total consumer loans 28,811 20,406 1,353 50,570 1,413,193 (52,988 ) 1,410,775 Total acquired loans $ 66,926 $ 89,950 $ 10,991 $ 167,867 $ 5,768,610 $ (283,201 ) $ 5,653,276 (1) Past due information for acquired loans is based on the contractual balance outstanding at March 31, 2018 and December 31, 2017 . (2) Acquired loans are considered performing upon acquisition, regardless of whether the customer is contractually delinquent, if 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 or non-performing and continue to recognize interest income on these loans using the accretion method. Acquired loans are considered non-accrual or non-performing when, due to credit deterioration or other factors, we determine we are no longer able to reasonably estimate the timing and amount of expected cash flows on such loans. We do not recognize interest income on acquired loans considered non-accrual or non-performing.
Summary of Commercial Loans by Credit Quality	The following tables present a summary of 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 Mention Substandard Doubtful Total Originated Loans and Leases March 31, 2018 Commercial real estate $ 5,195,183 $ 148,120 $ 121,542 $ 305 $ 5,465,150 Commercial and industrial 3,412,745 191,627 80,803 2,945 3,688,120 Commercial leases 269,837 3,518 6,227 — 279,582 Other 38,231 43 1,073 — 39,347 Total originated commercial loans and leases $ 8,915,996 $ 343,308 $ 209,645 $ 3,250 $ 9,472,199 December 31, 2017 Commercial real estate $ 4,922,872 $ 152,744 $ 98,728 $ 439 $ 5,174,783 Commercial and industrial 3,266,966 132,975 92,091 3,215 3,495,247 Commercial leases 260,235 4,425 2,060 — 266,720 Other 15,866 43 1,154 — 17,063 Total originated commercial loans and leases $ 8,465,939 $ 290,187 $ 194,033 $ 3,654 $ 8,953,813 Acquired Loans March 31, 2018 Commercial real estate $ 2,877,345 $ 225,364 $ 243,402 $ 214 $ 3,346,325 Commercial and industrial 520,361 28,166 43,314 8 591,849 Total acquired commercial loans $ 3,397,706 $ 253,530 $ 286,716 $ 222 $ 3,938,174 December 31, 2017 Commercial real estate $ 3,102,788 $ 250,987 $ 213,089 $ 217 $ 3,567,081 Commercial and industrial 603,611 26,059 45,661 89 675,420 Total acquired commercial loans $ 3,706,399 $ 277,046 $ 258,750 $ 306 $ 4,242,501
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, 2018 Direct installment $ 1,721,589 $ 15,653 $ 1,737,242 Residential mortgages 2,115,204 16,134 2,131,338 Indirect installment 1,521,906 2,424 1,524,330 Consumer lines of credit 1,130,978 4,510 1,135,488 Total originated consumer loans $ 6,489,677 $ 38,721 $ 6,528,398 December 31, 2017 Direct installment $ 1,739,060 $ 16,653 $ 1,755,713 Residential mortgages 2,019,816 16,410 2,036,226 Indirect installment 1,445,833 2,435 1,448,268 Consumer lines of credit 1,147,576 3,894 1,151,470 Total originated consumer loans $ 6,352,285 $ 39,392 $ 6,391,677 Acquired loans March 31, 2018 Direct installment $ 134,327 $ 70 $ 134,397 Residential mortgages 630,763 — 630,763 Indirect installment 171 — 171 Consumer lines of credit 556,633 1,662 558,295 Total acquired consumer loans $ 1,321,894 $ 1,732 $ 1,323,626 December 31, 2017 Direct installment $ 149,751 $ 71 $ 149,822 Residential mortgages 666,465 — 666,465 Indirect installment 165 — 165 Consumer lines of credit 592,384 1,939 594,323 Total acquired consumer loans $ 1,408,765 $ 2,010 $ 1,410,775
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 With Specific Reserve Total Recorded Investment Specific Reserve Average Recorded Investment At or for the Three Months Ended March 31, 2018 Commercial real estate $ 30,584 $ 25,478 $ 1,751 $ 27,229 $ 305 $ 25,988 Commercial and industrial 26,034 15,859 5,007 20,866 2,945 20,479 Commercial leases 1,399 1,399 — 1,399 — 1,486 Other — — — — — — Total commercial loans and leases 58,017 42,736 6,758 49,494 3,250 47,953 Direct installment 18,623 15,653 — 15,653 — 16,153 Residential mortgages 17,448 16,134 — 16,134 — 16,272 Indirect installment 4,648 2,424 — 2,424 — 2,429 Consumer lines of credit 5,698 4,510 — 4,510 — 4,202 Total consumer loans 46,417 38,721 — 38,721 — 39,056 Total $ 104,434 $ 81,457 $ 6,758 $ 88,215 $ 3,250 $ 87,009 At or for the Year Ended Commercial real estate $ 27,718 $ 21,748 $ 2,906 $ 24,654 $ 439 $ 24,413 Commercial and industrial 29,307 11,595 4,457 16,052 3,215 23,907 Commercial leases 1,574 1,574 — 1,574 — 1,386 Other — — — — — — Total commercial loans and leases 58,599 34,917 7,363 42,280 3,654 49,706 Direct installment 19,375 16,653 — 16,653 — 16,852 Residential mortgages 17,754 16,410 — 16,410 — 15,984 Indirect installment 5,709 2,435 — 2,435 — 2,279 Consumer lines of credit 5,039 3,894 — 3,894 — 3,815 Total consumer loans 47,877 39,392 — 39,392 — 38,930 Total $ 106,476 $ 74,309 $ 7,363 $ 81,672 $ 3,654 $ 88,636
Additional Allowance for Credit Losses Relating to Acquired Loans	Following is a summary of the allowance for credit losses required for acquired loans due to changes in credit quality subsequent to the acquisition date: (in thousands) March 31, December 31, Commercial real estate $ 2,732 $ 4,976 Commercial and industrial 1,785 (415 ) Total commercial loans 4,517 4,561 Direct installment 1,804 1,553 Residential mortgages 518 484 Indirect installment 240 177 Consumer lines of credit (242 ) (77 ) Total consumer loans 2,320 2,137 Total allowance on acquired loans $ 6,837 $ 6,698
Summary of the composition of total TDRs	Following is a summary of the composition of total TDRs: (in thousands) Originated Acquired Total March 31, 2018 Accruing: Performing $ 19,525 $ 249 $ 19,774 Non-performing 21,283 3,169 24,452 Non-accrual 10,668 357 11,025 Total TDRs $ 51,476 $ 3,775 $ 55,251 December 31, 2017 Accruing: Performing $ 19,538 $ 266 $ 19,804 Non-performing 20,173 3,308 23,481 Non-accrual 10,472 234 10,706 Total TDRs $ 50,183 $ 3,808 $ 53,991
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, December 31, Specific reserves for commercial TDRs $ 726 $ 95 Pooled reserves for individual commercial loans 519 469
Summary of Troubled Debt Restructurings by Class of Loans	Following is a summary of TDR loans, by class: Three Months Ended March 31, 2018 (dollars in thousands) Number of Contracts Pre- Modification Outstanding Recorded Investment Post- Modification Outstanding Recorded Investment Commercial real estate 1 $ 328 $ 328 Commercial and industrial 1 1,687 1,230 Total commercial loans 2 2,015 1,558 Direct installment 182 1,135 1,056 Residential mortgages 11 501 504 Indirect installment 9 13 12 Consumer lines of credit 21 352 287 Total consumer loans 223 2,001 1,859 Total 225 $ 4,016 $ 3,417 Three Months Ended March 31, 2017 (dollars in thousands) Number of Contracts Pre- Modification Outstanding Recorded Investment Post- Modification Outstanding Recorded Investment Commercial real estate 1 $ 114 $ 109 Commercial and industrial — — — Total commercial loans 1 114 109 Direct installment 171 1,488 1,412 Residential mortgages 8 163 176 Indirect installment 5 17 14 Consumer lines of credit 22 742 729 Total consumer loans 206 2,410 2,331 Total 207 $ 2,524 $ 2,440
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 or cured by period end. Default occurs when a loan is 90 days or more past due and is within 12 months of restructuring. Three Months Ended (dollars in thousands) Number of Contracts Recorded Investment Direct installment 45 $ 130 Residential mortgages 4 190 Indirect installment 5 10 Consumer lines of credit 1 196 Total consumer loans 55 526 Total 55 $ 526 Three Months Ended (dollars in thousands) Number of Contracts Recorded Investment Direct installment 29 $ 82 Residential mortgages 2 224 Indirect installment 6 10 Consumer lines of credit 1 34 Total consumer loans 38 350 Total 38 $ 350

ALLOWANCE FOR CREDIT LOSSES (Ta

ALLOWANCE FOR CREDIT LOSSES (Tables)	3 Months Ended
	Mar. 31, 2018
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 Period Charge- Offs Recoveries Net Charge- Offs Provision for Credit Losses Balance at End of Period Three Months Ended March 31, 2018 Commercial real estate $ 50,281 $ (225 ) $ 337 $ 112 $ 3,123 $ 53,516 Commercial and industrial 51,963 (5,920 ) 369 (5,551 ) 6,601 53,013 Commercial leases 5,646 (171 ) 10 (161 ) 630 6,115 Other 1,843 (797 ) 297 (500 ) 652 1,995 Total commercial loans and leases 109,733 (7,113 ) 1,013 (6,100 ) 11,006 114,639 Direct installment 20,936 (3,470 ) 440 (3,030 ) 2,222 20,128 Residential mortgages 15,507 (79 ) 91 12 (239 ) 15,280 Indirect installment 11,967 (2,409 ) 895 (1,514 ) 1,502 11,955 Consumer lines of credit 10,539 (531 ) 121 (410 ) 279 10,408 Total consumer loans 58,949 (6,489 ) 1,547 (4,942 ) 3,764 57,771 Total allowance on originated loans and leases 168,682 (13,602 ) 2,560 (11,042 ) 14,770 172,410 Purchased credit-impaired loans 635 — — — (13 ) 622 Other acquired loans 6,063 (309 ) 723 414 (262 ) 6,215 Total allowance on acquired loans 6,698 (309 ) 723 414 (275 ) 6,837 Total allowance for credit losses $ 175,380 $ (13,911 ) $ 3,283 $ (10,628 ) $ 14,495 $ 179,247 (in thousands) Balance at Beginning of Period Charge- Offs Recoveries Net Charge- Offs Provision for Credit Losses Balance at End of Period 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 Other 1,392 (973 ) 327 (646 ) 1,063 1,809 Total commercial loans and leases 99,298 (4,930 ) 1,163 (3,767 ) 9,750 105,281 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 Total consumer loans 51,493 (5,882 ) 1,735 (4,147 ) 1,587 48,933 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 for credit losses $ 158,059 $ (11,294 ) $ 3,167 $ (8,127 ) $ 10,850 $ 160,782
Summary of Individual and Collective Allowance for Credit Losses and Loan and Lease Balances by Class	Following is a summary of the individual and collective originated allowance for credit losses and corresponding originated loan and lease balances by class: Originated Allowance Originated Loans and Leases Outstanding (in thousands) Individually Evaluated for Impairment Collectively Evaluated for Impairment Loans and Leases Individually Evaluated for Impairment Collectively Evaluated for Impairment March 31, 2018 Commercial real estate $ 305 $ 53,211 $ 5,465,150 $ 12,292 $ 5,452,858 Commercial and industrial 2,945 50,068 3,688,120 10,880 3,677,240 Commercial leases — 6,115 279,582 — 279,582 Other — 1,995 39,347 — 39,347 Total commercial loans and leases 3,250 111,389 9,472,199 23,172 9,449,027 Direct installment — 20,128 1,737,242 — 1,737,242 Residential mortgages — 15,280 2,131,338 — 2,131,338 Indirect installment — 11,955 1,524,330 — 1,524,330 Consumer lines of credit — 10,408 1,135,488 — 1,135,488 Total consumer loans — 57,771 6,528,398 — 6,528,398 Total $ 3,250 $ 169,160 $ 16,000,597 $ 23,172 $ 15,977,425 December 31, 2017 Commercial real estate $ 439 $ 49,842 $ 5,174,783 $ 11,114 $ 5,163,669 Commercial and industrial 3,215 48,748 3,495,247 9,872 3,485,375 Commercial leases — 5,646 266,720 — 266,720 Other — 1,843 17,063 — 17,063 Total commercial loans and leases 3,654 106,079 8,953,813 20,986 8,932,827 Direct installment — 20,936 1,755,713 — 1,755,713 Residential mortgages — 15,507 2,036,226 — 2,036,226 Indirect installment — 11,967 1,448,268 — 1,448,268 Consumer lines of credit — 10,539 1,151,470 — 1,151,470 Total consumer loans — 58,949 6,391,677 — 6,391,677 Total $ 3,654 $ 165,028 $ 15,345,490 $ 20,986 $ 15,324,504

LOAN SERVICING (Tables)

LOAN SERVICING (Tables)	3 Months Ended
	Mar. 31, 2018
Mortgage Servicing Rights [Member]
Servicing Assets at Fair Value [Line Items]
Servicing Asset at Amortized Cost	The unpaid principal balance of mortgage loans serviced for others, as of March 31, 2018 and December 31, 2017 , is listed below: (in thousands) March 31, 2018 December 31, 2017 Mortgage loans sold with servicing retained $ 3,417,642 $ 3,256,548 The following table summarizes activity relating to mortgage loans sold with servicing retained: Three Months Ended March 31, (in thousands) 2018 2017 Mortgage loans sold with servicing retained $ 236,893 $ 129,843 Pretax gains resulting from above loan sales (1) 3,798 3,638 Mortgage servicing fees (1) 2,174 1,603 (1) Recorded in mortgage banking operations. Following is a summary of the MSR activity: Three Months Ended (in thousands) 2018 2017 Balance at beginning of period $ 29,053 $ 13,521 Fair value of MSRs acquired — 8,553 Additions 2,710 1,454 Payoffs and curtailments (405 ) (139 ) Amortization (567 ) (523 ) Balance at end of period $ 30,791 $ 22,866 Fair value, beginning of period $ 32,419 $ 17,546 Fair value, end of period 36,445 26,962
Schedule of Assumptions for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement	Following is a summary of the sensitivity of the fair value of MSRs to changes in key assumptions: (dollars in thousands) March 31, December 31, Weighted average life (months) 84.5 80.4 Constant prepayment rate (annualized) 9.1 % 9.9 % Discount rate 9.9 % 9.9 % Effect on fair value due to change in interest rates: +0.25% $ 1,179 $ 1,737 +0.50% 2,131 3,220 -0.25% (1,476 ) (1,937 ) -0.50% (3,237 ) (4,007 )
SBA-Guaranteed Loan Servicing [Member]
Servicing Assets at Fair Value [Line Items]
Servicing Asset at Amortized Cost	The unpaid principal balance of SBA-guaranteed loans serviced for investors, as of March 31, 2018 and December 31, 2017 , was as follows: (in thousands) March 31, December 31, SBA loans sold to investors with servicing retained $ 300,857 $ 305,977 The following table summarizes activity relating to SBA loans sold with servicing retained: Three Months Ended (in thousands) 2018 2017 SBA loans sold with servicing retained $ 12,288 $ — Pretax gains resulting from above loan sales (1) 1,101 — SBA servicing fees (1) 750 115 (1) Recorded in non-interest income. Following is a summary of the activity in SBA servicing rights: Three Months Ended (in thousands) 2017 2017 Balance at beginning of period $ 5,058 $ — Fair value of servicing rights acquired — 5,399 Additions 388 — Impairment (charge) / recovery (90 ) — Amortization (294 ) (60 ) Balance at end of period $ 5,062 $ 5,339 Fair value, beginning of period $ 5,058 $ — Fair value, end of period 5,062 5,339
Schedule of Assumptions for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement	Following is a summary of key assumptions and the sensitivity of the SBA loan servicing rights to changes in these assumptions: March 31, 2018 December 31, 2017 Decline in fair value due to Decline in fair value due to (dollars in thousands) Actual 10% adverse change 20% adverse change 1% adverse change 2% adverse change Actual 10% adverse change 20% adverse change 1% adverse change 2% adverse change Weighted-average life (months) 61.0 63.5 Constant prepayment rate (annualized) 10.01 % $ (158 ) $ (309 ) $ — $ — 9.29 % $ (145 ) $ (284 ) $ — $ — Discount rate 14.76 — — (148 ) (287 ) 14.87 — — (147 ) (286 )

BORROWINGS (Tables)

BORROWINGS (Tables)	3 Months Ended
	Mar. 31, 2018
Debt Disclosure [Abstract]
Summary of Short-Term Borrowings	Following is a summary of short-term borrowings: (in thousands) March 31, December 31, Securities sold under repurchase agreements $ 280,492 $ 256,017 Federal Home Loan Bank advances 1,555,000 2,285,000 Federal funds purchased 1,830,000 1,000,000 Subordinated notes 136,988 137,320 Total short-term borrowings $ 3,802,480 $ 3,678,337
Summary of Long-Term Borrowings	Following is a summary of long-term borrowings: (in thousands) March 31, December 31, Federal Home Loan Bank advances $ 300,053 $ 310,061 Subordinated notes 89,523 87,614 Junior subordinated debt 110,466 110,347 Other subordinated debt 159,848 160,151 Total long-term borrowings $ 659,890 $ 668,173
Junior Subordinated Debt Trusts	The following table provides information relating to the Trusts as of March 31, 2018 : (dollars in thousands) Trust Preferred Securities Common Securities Junior Subordinated Debt Stated Maturity Date Interest Rate Rate Reset Factor F.N.B. Statutory Trust II $ 21,500 $ 665 $ 22,165 6/15/2036 3.77 % LIBOR + 165 basis points (bps) Omega Financial Capital Trust I 26,000 1,114 26,483 10/18/2034 3.92 % LIBOR + 219 bps Yadkin Valley Statutory Trust I 25,000 774 20,925 12/15/2037 3.44 % LIBOR + 132 bps FNB Financial Services Capital Trust I 25,000 774 21,859 9/30/2035 3.79 % LIBOR + 146 bps American Community Capital Trust II 10,000 310 10,446 12/15/2033 5.11 % LIBOR + 280 bps Crescent Financial Capital Trust I 8,000 248 8,588 10/7/2033 4.82 % LIBOR + 310 bps Total $ 115,500 $ 3,885 $ 110,466

DERIVATIVE INSTRUMENTS AND HE35

DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Tables)	3 Months Ended
	Mar. 31, 2018
Derivative Instruments and Hedging Activities Disclosures [Line Items]
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 which are not offset in the balance sheet. March 31, 2018 December 31, 2017 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 $ 705,000 $ — $ 3,662 $ 705,000 $ 228 $ 1,982 Interest rate swaps – not designated 2,422,236 3,481 9,117 2,245,442 1,169 11,599 Equity contracts – not designated 1,180 26 — 1,180 51 — Total subject to master netting arrangements 3,128,416 3,507 12,779 2,951,622 1,448 13,581 Not subject to master netting arrangements: Interest rate swaps – not designated 2,422,236 15,176 38,787 2,245,442 27,233 15,303 Interest rate lock commitments – not designated 78,368 1,380 5 88,107 1,594 5 Forward delivery commitments – not designated 94,996 209 231 106,572 233 148 Credit risk contracts – not designated 206,747 20 64 235,196 39 109 Equity contracts – not designated 1,180 — 26 1,180 — 51 Total not subject to master netting arrangements 2,803,527 16,785 39,113 2,676,497 29,099 15,616 Total $ 5,931,943 $ 20,292 $ 51,892 $ 5,628,119 $ 30,547 $ 29,197
Summary of Amounts Reclassified from Accumulated Other Comprehensive Income (AOCI)	The following table shows amounts reclassified from accumulated other comprehensive income for the three months ended March 31, 2018 : (in thousands) Total Net of Tax Reclassified from AOCI to interest income $ 93 $ 73 Reclassified from AOCI to interest expense (129 ) (102 )
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 (in thousands) Income Statement Location 2018 2017 Interest Rate Contracts Interest income - loans and leases $ 93 $ 506 Interest Rate Contracts Interest expense – short-term borrowings (129 ) 148 Interest Rate Swaps Other income (160 ) (219 ) Credit Risk Contracts Other income 27 19
Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Summary of Key Data Related to Interest Rate	Following is a summary of key data related to interest rate contracts: (in thousands) March 31, December 31, Notional amount $ 705,000 $ 705,000 Fair value included in other assets — 228 Fair value included in other liabilities 3,662 1,982
Not Designated as Hedging Instrument [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Summary of Key Data Related to Interest Rate	Following is a summary of key data related to interest rate swaps: (in thousands) March 31, December 31, Notional amount $ 4,844,472 $ 4,490,884 Fair value included in other assets 18,657 28,402 Fair value included in other liabilities 47,904 26,902
Counter Party [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
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 Balance Sheet (in thousands) Net Amount Presented in the Balance Sheet Financial Instruments Cash Collateral Net Amount March 31, 2018 Derivative Assets Interest rate contracts: Designated $ — $ — — $ — Not designated 3,481 3,451 — 30 Equity contracts – not designated 26 26 — — Total $ 3,507 $ 3,477 — $ 30 December 31, 2017 Derivative Assets Interest rate contracts: Designated $ 228 $ 228 $ — $ — Not designated 1,169 1,169 — — Equity contracts – not designated 51 51 — — Total $ 1,448 $ 1,448 $ — $ —
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 Balance Sheet (in thousands) Net Amount Presented in the Balance Sheet Financial Instruments Cash Collateral Net Amount March 31, 2018 Derivative Liabilities Interest rate contracts: Designated $ 3,662 $ 3,662 — $ — Not designated 9,117 8,592 — 525 Total $ 12,779 $ 12,254 — $ 525 December 31, 2017 Derivative Liabilities Interest rate contracts: Designated $ 1,982 $ 1,982 $ — $ — Not designated 11,599 10,940 — 659 Total $ 13,581 $ 12,922 $ — $ 659

COMMITMENTS, CREDIT RISK AND 36

COMMITMENTS, CREDIT RISK AND CONTINGENCIES (Tables)	3 Months Ended
	Mar. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Summary of Off-Balance Sheet Credit Risk Information	Following is a summary of off-balance sheet credit risk information: (in thousands) March 31, December 31, Commitments to extend credit $ 7,097,958 $ 6,957,822 Standby letters of credit 136,661 132,904

STOCK INCENTIVE PLANS (Tables)

STOCK INCENTIVE PLANS (Tables)	3 Months Ended
	Mar. 31, 2018
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, 2018 2017 Awards Weighted Average Grant Price per Share Awards Weighted Average Grant Price per Share Unvested awards outstanding at beginning of period 1,975,862 $ 13.64 1,836,363 $ 12.97 Vested (7,631 ) 12.83 (243,982 ) 11.83 Forfeited/expired (19,893 ) 14.02 (2,950 ) 13.00 Dividend reinvestment 16,373 14.37 12,253 14.54 Unvested awards outstanding at end of period 1,964,711 13.65 1,601,684 13.16
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 2018 2017 Stock-based compensation expense $ 1,939 $ 1,760 Tax benefit related to stock-based compensation expense 407 616 Fair value of awards vested 110 3,802
Components of Restricted Stock Awards	The components of the restricted stock awards as of March 31, 2018 are as follows: (dollars in thousands) Service- Based Awards Performance- Based Awards Total Unvested restricted stock awards 1,050,062 914,649 1,964,711 Unrecognized compensation expense $ 5,691 $ 4,061 $ 9,752 Intrinsic value $ 14,123 $ 12,302 $ 26,425 Weighted average remaining life (in years) 1.76 1.50 1.64
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, 2018 2017 Shares Weighted Average Exercise Price per Share Shares Weighted Average Exercise Price per Share Options outstanding at beginning of period 722,650 $ 7.96 892,532 $ 8.95 Assumed from acquisitions — — 207,645 8.92 Exercised (163,035 ) 7.79 (131,792 ) 9.44 Forfeited/expired (237 ) 10.72 (49,281 ) 10.91 Options outstanding and exercisable at end of period 559,378 8.03 919,104 8.77

RETIREMENT PLANS (Tables)

RETIREMENT PLANS (Tables)	3 Months Ended
	Mar. 31, 2018
Retirement Benefits [Abstract]
Schedule of Contribution Expense	Our contribution expense is presented in the following table: Three Months Ended (in thousands) 2018 2017 401(k) contribution expense $ 3,610 $ 2,767
Net Periodic Benefit Credit for Defined Benefit Plans	The net periodic benefit credit for these plans includes the following components: Three Months Ended (in thousands) 2018 2017 Service cost $ (4 ) $ (4 ) Interest cost 1,560 1,477 Expected return on plan assets (2,895 ) (2,427 ) Amortization: Unrecognized prior service cost — 2 Unrecognized loss 623 628 Net periodic pension credit $ (716 ) $ (324 )

INCOME TAXES (Tables)

INCOME TAXES (Tables)	3 Months Ended
	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Schedule of Components of Income Tax Expense (Benefit)	Federal and state income tax expense and the statutory tax rate and the actual effective tax rate consist of the following: Three Months Ended (in thousands) 2018 2017 Current income taxes: Federal taxes $ 17,700 $ 6,688 State taxes 1,704 499 Total current income taxes 19,404 7,187 Deferred income taxes: Federal taxes 1,902 1,690 State taxes (38 ) (2,393 ) Total deferred income taxes 1,864 (703 ) Total income taxes $ 21,268 $ 6,484 Statutory tax rate 21.0 % 35.0 % Effective tax rate 19.7 % 22.0 %

OTHER COMPREHENSIVE INCOME (Tab

OTHER COMPREHENSIVE INCOME (Tables)	3 Months Ended
	Mar. 31, 2018
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 Losses on Debt Securities Available for Sale Unrealized Net Gains (Losses) on Derivative Instruments Unrecognized Pension and Postretirement Obligations Total Three Months Ended March 31, 2018 Balance at beginning of period $ (29,626 ) $ 5,407 $ (58,833 ) $ (83,052 ) Other comprehensive (loss) income before reclassifications (29,787 ) 3,804 484 (25,499 ) Amounts reclassified from AOCI — (173 ) — (173 ) Net current period other comprehensive (loss) income (29,787 ) 3,631 484 (25,672 ) Balance at end of period $ (59,413 ) $ 9,038 $ (58,349 ) $ (108,724 )

EARNINGS PER COMMON SHARE (Tabl

EARNINGS PER COMMON SHARE (Tables)	3 Months Ended
	Mar. 31, 2018
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 ( dollars in thousands, except per share data) 2018 2017 Net income $ 86,762 $ 22,979 Less: Preferred stock dividends 2,010 2,010 Net income available to common stockholders $ 84,752 $ 20,969 Basic weighted average common shares outstanding 323,740,956 237,379,260 Net effect of dilutive stock options, warrants and restricted stock 2,026,012 1,882,423 Diluted weighted average common shares outstanding 325,766,968 239,261,683 Earnings per common share: Basic $ 0.26 $ 0.09 Diluted $ 0.26 $ 0.09
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 2018 2017 Average shares excluded from the diluted earnings per common share calculation 21 81,755

CASH FLOW INFORMATION (Tables)

CASH FLOW INFORMATION (Tables)	3 Months Ended
	Mar. 31, 2018
Supplemental Cash Flow Elements [Abstract]
Summary of Supplemental Cash Flow Information	Following is a summary of supplemental cash flow information: Three Months Ended 2018 2017 (in thousands) Interest paid on deposits and other borrowings $ 46,540 $ 18,606 Transfers of loans to other real estate owned 3,954 20,517

BUSINESS SEGMENTS (Tables)

BUSINESS SEGMENTS (Tables)	3 Months Ended
	Mar. 31, 2018
Segment Reporting [Abstract]
Financial Information for Segments	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 subsidiaries and eliminations and adjustments to reconcile to the Consolidated Financial Statements. (in thousands) Community Banking Wealth Management Insurance Consumer Finance Parent and Other Consolidated At or for the Three Months Ended March 31, 2018 Interest income $ 263,587 $ — $ 20 $ 9,294 $ 26 $ 272,927 Interest expense 42,360 — — 910 3,552 46,822 Net interest income 221,227 — 20 8,384 (3,526 ) 226,105 Provision for credit losses 12,412 — — 2,083 — 14,495 Non-interest income 53,312 11,002 4,303 638 (1,752 ) 67,503 Non-interest expense (1) 148,667 8,278 3,711 5,230 979 166,865 Amortization of intangibles 4,105 61 52 — — 4,218 Income tax expense (benefit) 21,720 589 124 474 (1,639 ) 21,268 Net income (loss) 87,635 2,074 436 1,235 (4,618 ) 86,762 Total assets 31,424,150 25,129 20,529 169,737 12,808 31,652,353 Total intangibles 2,315,127 10,128 12,075 1,809 — 2,339,139 At or for the Three Months Ended March 31, 2017 Interest income $ 185,381 $ — $ 20 $ 9,902 $ (610 ) $ 194,693 Interest expense 18,865 — — 922 2,154 21,941 Net interest income 166,516 — 20 8,980 (2,764 ) 172,752 Provision for credit losses 9,064 — — 1,786 — 10,850 Non-interest income 40,716 9,549 4,325 710 (184 ) 55,116 Non-interest expense (1) 168,283 7,540 3,315 5,231 88 184,457 Amortization of intangibles 2,982 61 55 — — 3,098 Income tax expense (benefit) 6,311 711 347 1,067 (1,952 ) 6,484 Net income (loss) 20,592 1,237 628 1,606 (1,084 ) 22,979 Total assets 29,978,061 22,130 20,514 184,006 (14,016 ) 30,190,695 Total intangibles 2,332,352 10,353 12,285 1,809 — 2,356,799 (1) Excludes amortization of intangibles, which is presented separately.

FAIR VALUE MEASUREMENTS (Tables

FAIR VALUE MEASUREMENTS (Tables)	3 Months Ended
	Mar. 31, 2018
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, 2018 Assets Measured at Fair Value Debt securities available for sale U.S. government-sponsored entities $ — $ 358,648 $ — $ 358,648 Residential mortgage-backed securities: Agency mortgage-backed securities — 1,671,573 — 1,671,573 Agency collateralized mortgage obligations — 832,350 — 832,350 Non-agency collateralized mortgage obligations — 1 — 1 Commercial mortgage-backed securities — 39,213 — 39,213 States of the U.S. and political subdivisions — 21,023 — 21,023 Other debt securities — 4,655 — 4,655 Total debt securities available for sale — 2,927,463 — 2,927,463 Loans held for sale — 21,610 — 21,610 Marketable equity securities Fixed income mutual fund 177 — — 177 Financial services industry — 944 — 944 Total marketable equity securities 177 944 — 1,121 Derivative financial instruments Trading — 18,683 — 18,683 Not for trading — 229 1,380 1,609 Total derivative financial instruments — 18,912 1,380 20,292 Total assets measured at fair value on a recurring basis $ 177 $ 2,968,929 $ 1,380 $ 2,970,486 Liabilities Measured at Fair Value Derivative financial instruments Trading $ — $ 47,930 $ — $ 47,930 Not for trading — 3,957 5 3,962 Total derivative financial instruments — 51,887 5 51,892 Total liabilities measured at fair value on a recurring basis $ — $ 51,887 $ 5 $ 51,892 (in thousands) Level 1 Level 2 Level 3 Total December 31, 2017 Assets Measured at Fair Value Debt securities available for sale U.S. government-sponsored entities $ — $ 343,942 $ — $ 343,942 Residential mortgage-backed securities: Agency mortgage-backed securities — 1,598,874 — 1,598,874 Agency collateralized mortgage obligations — 794,957 — 794,957 Non-agency collateralized mortgage obligations — 1 — 1 States of the U.S. and political subdivisions — 21,093 — 21,093 Other debt securities — 4,670 — 4,670 Total debt securities available for sale — 2,763,537 — 2,763,537 Equity securities available for sale Fixed income mutual fund 161 — — 161 Financial services industry — 864 — 864 Total equity securities available for sale 161 864 — 1,025 Total securities available for sale 161 2,764,401 — 2,764,562 Loans held for sale — 56,458 — 56,458 Derivative financial instruments Trading — 28,453 — 28,453 Not for trading — 500 1,594 2,094 Total derivative financial instruments — 28,953 1,594 30,547 Total assets measured at fair value on a recurring basis $ 161 $ 2,849,812 $ 1,594 $ 2,851,567 Liabilities Measured at Fair Value Derivative financial instruments Trading $ — $ 26,953 $ — $ 26,953 Not for trading — 2,239 5 2,244 Total derivative financial instruments — 29,192 5 29,197 Total liabilities measured at fair value on a recurring basis $ — $ 29,192 $ 5 $ 29,197
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 Securities Residential Non-Agency Collateralized Mortgage Obligations Interest Rate Lock Commitments Total Three Months Ended March 31, 2018 Balance at beginning of period $ — $ — $ — $ 1,594 $ 1,594 Purchases, issuances, sales and settlements: Purchases — — — 1,380 1,380 Settlements — — — (1,594 ) (1,594 ) Balance at end of period $ — $ — $ — $ 1,380 $ 1,380 Year Ended December 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 — — 1,594 13,642 Sales/redemptions (12,047 ) — (874 ) — (12,921 ) Settlements — — (19 ) (4,569 ) (4,588 ) Transfers from Level 3 — (578 ) — — (578 ) Transfers into Level 3 — — — 4,569 4,569 Balance at end of period $ — $ — $ — $ 1,594 $ 1,594
Additional Information about Assets Measured at Fair Value on Non-Recurring Basis	For assets measured at fair value on a non-recurring basis still held at the balance sheet date, the following table provides the hierarchy level and the fair value of the related assets or portfolios: (in thousands) Level 1 Level 2 Level 3 Total March 31, 2018 Impaired loans $ — $ 2,032 $ 1,475 $ 3,507 Other real estate owned — — 1,621 1,621 Other assets - SBA servicing asset — — 5,062 5,062 December 31, 2017 Impaired loans $ — $ 2,813 $ 1,297 $ 4,110 Other real estate owned — 10,513 10,823 21,336 Loans held for sale - SBA — — 36,432 36,432 Other assets - SBA servicing asset — — 5,058 5,058
Fair Values of Financial Instruments	The fair values of our financial instruments are as follows: Fair Value Measurements (in thousands) Carrying Amount Fair Value Level 1 Level 2 Level 3 March 31, 2018 Financial Assets Cash and cash equivalents $ 386,329 $ 386,329 $ 386,329 $ — $ — Debt securities available for sale 2,927,463 2,927,463 — 2,927,463 — Debt securities held to maturity 3,224,000 3,131,964 — 3,131,964 — Net loans and leases, including loans held for sale 21,121,132 20,900,639 — 21,610 20,879,029 Loan servicing rights 35,853 41,878 — — 41,878 Marketable equity securities 1,121 1,121 177 944 — Derivative assets 20,292 20,292 — 18,912 1,380 Accrued interest receivable 95,082 95,082 95,082 — — Financial Liabilities Deposits 22,497,089 22,441,017 17,755,830 4,685,187 — Short-term borrowings 3,802,480 3,802,988 3,802,988 — — Long-term borrowings 659,890 663,085 — — 663,085 Derivative liabilities 51,892 51,892 — 51,887 5 Accrued interest payable 12,762 12,762 12,762 — — December 31, 2017 Financial Assets Cash and cash equivalents $ 479,443 $ 479,443 $ 479,443 $ — $ — Securities available for sale 2,764,562 2,764,562 161 2,764,401 — Debt securities held to maturity 3,242,268 3,218,379 — 3,218,379 — Net loans and leases, including loans held for sale 20,916,277 20,661,196 — 56,458 20,604,738 Loan servicing rights 34,111 37,758 — — 37,758 Derivative assets 30,547 30,547 — 28,953 1,594 Accrued interest receivable 94,254 94,254 94,254 — — Financial Liabilities Deposits 22,399,725 22,359,182 17,779,246 4,579,936 — Short-term borrowings 3,678,337 3,678,723 3,678,723 — — Long-term borrowings 668,173 675,489 — — 675,489 Derivative liabilities 29,197 29,197 — 29,192 5 Accrued interest payable 12,480 12,480 12,480 — —

NATURE OF OPERATIONS (Detail)

NATURE OF OPERATIONS (Detail)	3 Months Ended
	Mar. 31, 2018OfficeState
Segment Reporting Information [Line Items]
Number of states, Company operating financial services | State	8
Number of banking offices	417
Number of consumer finance offices	77
Minimum [Member]
Segment Reporting Information [Line Items]
Years of service (over)	150 years

SUMMARY OF SIGNIFICANT ACCOUN46

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Detail) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Accounting Policies [Abstract]
Net investment in LIHTCs	$ 26.1	$ 20.9
Qualified affordable housing project investments, commitment	$ 60.1	$ 67.2

NEW ACCOUNTING STANDARDS (Detai

NEW ACCOUNTING STANDARDS (Details) $ in Millions	Mar. 31, 2018USD ($)
Accounting Standards Update 2016-01 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of new accounting principle in period of adoption	$ 1.1

MERGERS AND ACQUISITIONS - Addi

MERGERS AND ACQUISITIONS - Additional Information (Detail) - Yadkin Financial Corporation (YDKN) [Member] $ / shares in Units, $ in Billions	Mar. 11, 2017USD ($)$ / sharesshares
Business Acquisition [Line Items]
Assets acquired as a result of merger	$ 6.8
Loans acquired as a result of merger	5.1
Deposits acquired as a result of merger	5.2
Value of acquisition	$ 1.8
Closing price of common stock (in dollars per share) | $ / shares	$ 15.97
Number of shares (in shares) | shares	111,619,622
Common shares to be acquired (shares) | shares	51,677,565
Ratio of shares entitled to receive as per merger agreement	2.16
Warrant Expires in 2019 [Member]
Business Acquisition [Line Items]
Warrant issued (in shares) | shares	207,320
Warrant issued, exercise price (in dollars per share) | $ / shares	$ 9.63

SECURITIES - Amortized Cost and

SECURITIES - Amortized Cost and Fair Value of Securities Available for Sale (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 3,003,776	$ 2,802,621
Gross Unrealized Gains	519	1,721
Gross Unrealized Losses	(76,832)	(39,780)
Securities available for sale	2,927,463	2,764,562
U.S. Government-Sponsored Entities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	364,600	347,767
Gross Unrealized Gains	0	52
Gross Unrealized Losses	(5,952)	(3,877)
Securities available for sale	358,648	343,942
Agency Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,713,036	1,615,168
Gross Unrealized Gains	458	1,225
Gross Unrealized Losses	(41,921)	(17,519)
Securities available for sale	1,671,573	1,598,874
Agency Collateralized Mortgage Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	860,902	813,034
Gross Unrealized Gains	28	0
Gross Unrealized Losses	(28,580)	(18,077)
Securities available for sale	832,350	794,957
Non-Agency Collateralized Mortgage Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1	1
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Securities available for sale	1	1
Commercial Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	39,183
Gross Unrealized Gains	30
Gross Unrealized Losses	0
Securities available for sale	39,213
States of the U.S. and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	21,138	21,151
Gross Unrealized Gains	3	6
Gross Unrealized Losses	(118)	(64)
Securities available for sale	21,023	21,093
Other Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	4,916	4,913
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(261)	(243)
Securities available for sale	$ 4,655	4,670
Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		2,802,034
Gross Unrealized Gains		1,283
Gross Unrealized Losses		(39,780)
Securities available for sale		2,763,537
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		587
Gross Unrealized Gains		438
Gross Unrealized Losses		0
Securities available for sale		$ 1,025

SECURITIES - Amortized Cost a50

SECURITIES - Amortized Cost and Fair Value of Securities Held to Maturity (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Investment Securities Held To Maturity [Line Items]
Amortized Cost	$ 3,224,000	$ 3,242,268
Gross Unrealized Gains	3,458	17,357
Gross Unrealized Losses	(95,494)	(41,246)
Fair Value	3,131,964	3,218,379
U.S. Treasury [Member]
Investment Securities Held To Maturity [Line Items]
Amortized Cost	500	500
Gross Unrealized Gains	114	134
Gross Unrealized Losses	0	0
Fair Value	614	634
U.S. Government-Sponsored Entities [Member]
Investment Securities Held To Maturity [Line Items]
Amortized Cost	247,272	247,310
Gross Unrealized Gains	81	93
Gross Unrealized Losses	(5,716)	(4,388)
Fair Value	241,637	243,015
Agency Mortgage-Backed Securities [Member]
Investment Securities Held To Maturity [Line Items]
Amortized Cost	1,174,426	1,219,802
Gross Unrealized Gains	491	3,475
Gross Unrealized Losses	(27,472)	(9,058)
Fair Value	1,147,445	1,214,219
Agency Collateralized Mortgage Obligations [Member]
Investment Securities Held To Maturity [Line Items]
Amortized Cost	783,151	777,146
Gross Unrealized Gains	257	32
Gross Unrealized Losses	(29,971)	(20,095)
Fair Value	753,437	757,083
Commercial Mortgage-Backed Securities [Member]
Investment Securities Held To Maturity [Line Items]
Amortized Cost	79,476	80,786
Gross Unrealized Gains	32	414
Gross Unrealized Losses	(1,245)	(575)
Fair Value	78,263	80,625
States of the U.S. and Political Subdivisions [Member]
Investment Securities Held To Maturity [Line Items]
Amortized Cost	939,175	916,724
Gross Unrealized Gains	2,483	13,209
Gross Unrealized Losses	(31,090)	(7,130)
Fair Value	$ 910,568	$ 922,803

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, 2018	Mar. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Gross gains	$ 0	$ 3,400
Gross losses	0	(775)
Net gains	$ 0	$ 2,625

SECURITIES - Amortized Cost a52

SECURITIES - Amortized Cost and Fair Value of Securities, by Contractual Maturities (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule Of Securities [Line Items]
Available for sale, due in one year or less, amortized cost	$ 65,814
Available for sale, due from one to five years, amortized cost	262,236
Available for sale, due from five to ten years, amortized cost	7,876
Available for sale, due after ten years, amortized cost	54,728
Available for sale, with contractual maturities, amortized cost	390,654
Total securities available for sale, amortized cost	3,003,776	$ 2,802,621
Available for sale, due in one year or less, fair value	65,498
Available for sale, due from one to five years, fair value	256,811
Available for sale, due from five to ten years, fair value	7,725
Available for sale, due after ten years, fair value	54,292
Available for sale, with contractual maturities, fair value	384,326
Total securities available for sale, fair value	2,927,463	2,764,562
Held to maturity, due in one year or less, amortized cost	45,461
Held to maturity, due from one to five years, amortized cost	210,014
Held to maturity, due from five to ten years, amortized cost	94,022
Held to maturity, due after ten years, amortized cost	837,450
Securities held to maturity, with contractual maturities, amortized cost	1,186,947
Held to maturity, with contractual maturities, amortized cost	3,224,000	3,242,268
Held to maturity, due in one year or less, fair value	45,221
Held to maturity, due from one to five years, fair value	204,580
Held to maturity, due from five to ten years, fair value	93,225
Held to maturity, due after ten years, fair value	809,793
Securities held to maturity, with contractual maturities, fair value	1,152,819
Held to maturity, with contractual maturities, fair value	3,131,964	3,218,379
Agency Mortgage-Backed Securities [Member]
Schedule Of Securities [Line Items]
Total securities available for sale, amortized cost	1,713,036	1,615,168
Total securities available for sale, fair value	1,671,573	1,598,874
Held to maturity, with contractual maturities, amortized cost	1,174,426
Held to maturity, with contractual maturities, fair value	1,147,445
Agency Collateralized Mortgage Obligations [Member]
Schedule Of Securities [Line Items]
Total securities available for sale, amortized cost	860,902	813,034
Total securities available for sale, fair value	832,350	794,957
Held to maturity, with contractual maturities, amortized cost	783,151
Held to maturity, with contractual maturities, fair value	753,437
Non-Agency Collateralized Mortgage Obligations [Member]
Schedule Of Securities [Line Items]
Total securities available for sale, amortized cost	1	1
Total securities available for sale, fair value	1	1
Held to maturity, with contractual maturities, amortized cost	0
Held to maturity, with contractual maturities, fair value	0
Commercial Mortgage-Backed Securities [Member]
Schedule Of Securities [Line Items]
Total securities available for sale, amortized cost	39,183
Total securities available for sale, fair value	39,213
Held to maturity, with contractual maturities, amortized cost	79,476
Held to maturity, with contractual maturities, fair value	$ 78,263
Equity Securities [Member]
Schedule Of Securities [Line Items]
Total securities available for sale, amortized cost		587
Total securities available for sale, fair value		$ 1,025

SECURITIES - Schedule of Securi

SECURITIES - Schedule of Securities Pledged as Collateral (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Securities pledged (carrying value), to secure public deposits, trust deposits and for other purposes as required by law	$ 3,532,023	$ 3,491,634
Securities pledged (carrying value), as collateral for short-term borrowings	$ 298,233	$ 263,756
Securities pledged as a percent of total securities	62.30%	62.50%

SECURITIES - Fair Values and Un

SECURITIES - Fair Values and Unrealized Losses of Impaired Securities, by Length of Impairment (Detail) $ in Thousands	Mar. 31, 2018USD ($)Security	Dec. 31, 2017USD ($)Security
Schedule Of Securities [Line Items]
Number of available for sale securities, Less than 1 year | Security	90	71
Number of available for sale securities, Greater than 1 year | Security	75	75
Number of available for sale securities | Security	165	146
Securities available for sale, less than 12 months, fair value	$ 1,853,291	$ 1,503,806
Securities available for sale, less than 12 months, unrealized losses	(40,316)	(14,372)
Securities available for sale, 12 months or more, fair value	963,238	1,016,111
Securities available for sale, 12 months or more, unrealized losses	(36,516)	(25,408)
Securities available for sale, fair value, total	2,816,529	2,519,917
Securities available for sale, unrealized losses, total	$ (76,832)	$ (39,780)
Number of held to maturity securities | Security	343	168
Securities held to maturity, less than 12 months, fair value	$ 1,822,941	$ 1,061,703
Securities held to maturity, less than 12 months, unrealized losses	(43,619)	(7,851)
Securities held to maturity, greater than 12 months, fair value	935,869	984,076
Securities held to maturity, greater than 12 months, unrealized losses	(51,875)	(33,395)
Securities held to maturity, fair value, total	2,758,810	2,045,779
Securities held to maturity, unrealized losses, total	$ (95,494)	$ (41,246)
Less than 12 Months [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities | Security	247	73
Greater than 12 Months [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities | Security	96	95
U.S. Government-Sponsored Entities [Member]
Schedule Of Securities [Line Items]
Number of available for sale securities, Less than 1 year | Security	8	7
Number of available for sale securities, Greater than 1 year | Security	10	10
Number of available for sale securities | Security	18	17
Securities available for sale, less than 12 months, fair value	$ 158,212	$ 106,809
Securities available for sale, less than 12 months, unrealized losses	(1,389)	(363)
Securities available for sale, 12 months or more, fair value	200,436	201,485
Securities available for sale, 12 months or more, unrealized losses	(4,563)	(3,514)
Securities available for sale, fair value, total	358,648	308,294
Securities available for sale, unrealized losses, total	$ (5,952)	$ (3,877)
Number of held to maturity securities | Security	14	14
Securities held to maturity, less than 12 months, fair value	$ 54,558	$ 54,790
Securities held to maturity, less than 12 months, unrealized losses	(465)	(239)
Securities held to maturity, greater than 12 months, fair value	184,750	185,851
Securities held to maturity, greater than 12 months, unrealized losses	(5,251)	(4,149)
Securities held to maturity, fair value, total	239,308	240,641
Securities held to maturity, unrealized losses, total	$ (5,716)	$ (4,388)
U.S. Government-Sponsored Entities [Member] | Less than 12 Months [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities | Security	4	4
U.S. Government-Sponsored Entities [Member] | Greater than 12 Months [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities | Security	10	10
Agency Mortgage-Backed Securities [Member]
Schedule Of Securities [Line Items]
Number of available for sale securities, Less than 1 year | Security	59	43
Number of available for sale securities, Greater than 1 year | Security	28	28
Number of available for sale securities | Security	87	71
Securities available for sale, less than 12 months, fair value	$ 1,212,767	$ 976,738
Securities available for sale, less than 12 months, unrealized losses	(25,545)	(7,723)
Securities available for sale, 12 months or more, fair value	444,583	473,625
Securities available for sale, 12 months or more, unrealized losses	(16,376)	(9,796)
Securities available for sale, fair value, total	1,657,350	1,450,363
Securities available for sale, unrealized losses, total	$ (41,921)	$ (17,519)
Number of held to maturity securities | Security	84	47
Securities held to maturity, less than 12 months, fair value	$ 935,246	$ 648,485
Securities held to maturity, less than 12 months, unrealized losses	(20,410)	(4,855)
Securities held to maturity, greater than 12 months, fair value	173,759	183,989
Securities held to maturity, greater than 12 months, unrealized losses	(7,062)	(4,203)
Securities held to maturity, fair value, total	1,109,005	832,474
Securities held to maturity, unrealized losses, total	$ (27,472)	$ (9,058)
Agency Mortgage-Backed Securities [Member] | Less than 12 Months [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities | Security	73	36
Agency Mortgage-Backed Securities [Member] | Greater than 12 Months [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities | Security	11	11
Agency Collateralized Mortgage Obligations [Member]
Schedule Of Securities [Line Items]
Number of available for sale securities, Less than 1 year | Security	16	14
Number of available for sale securities, Greater than 1 year | Security	33	33
Number of available for sale securities | Security	49	47
Securities available for sale, less than 12 months, fair value	$ 470,878	$ 409,005
Securities available for sale, less than 12 months, unrealized losses	(13,274)	(6,231)
Securities available for sale, 12 months or more, fair value	312,687	335,452
Securities available for sale, 12 months or more, unrealized losses	(15,306)	(11,846)
Securities available for sale, fair value, total	783,565	744,457
Securities available for sale, unrealized losses, total	$ (28,580)	$ (18,077)
Number of held to maturity securities | Security	51	49
Securities held to maturity, less than 12 months, fair value	$ 267,299	$ 275,290
Securities held to maturity, less than 12 months, unrealized losses	(5,862)	(1,701)
Securities held to maturity, greater than 12 months, fair value	444,572	473,257
Securities held to maturity, greater than 12 months, unrealized losses	(24,109)	(18,394)
Securities held to maturity, fair value, total	711,871	748,547
Securities held to maturity, unrealized losses, total	$ (29,971)	$ (20,095)
Agency Collateralized Mortgage Obligations [Member] | Less than 12 Months [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities | Security	16	14
Agency Collateralized Mortgage Obligations [Member] | Greater than 12 Months [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities | Security	35	35
Commercial Mortgage-Backed Securities [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities | Security	9	5
Securities held to maturity, less than 12 months, fair value	$ 48,737	$ 26,399
Securities held to maturity, less than 12 months, unrealized losses	(637)	(123)
Securities held to maturity, greater than 12 months, fair value	19,909	19,443
Securities held to maturity, greater than 12 months, unrealized losses	(608)	(452)
Securities held to maturity, fair value, total	68,646	45,842
Securities held to maturity, unrealized losses, total	$ (1,245)	$ (575)
Commercial Mortgage-Backed Securities [Member] | Less than 12 Months [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities | Security	6	3
Commercial Mortgage-Backed Securities [Member] | Greater than 12 Months [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities | Security	3	2
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	7	7
Number of available for sale securities, Greater than 1 year | Security	1	1
Number of available for sale securities | Security	8	8
Securities available for sale, less than 12 months, fair value	$ 11,434	$ 11,254
Securities available for sale, less than 12 months, unrealized losses	(108)	(55)
Securities available for sale, 12 months or more, fair value	877	879
Securities available for sale, 12 months or more, unrealized losses	(10)	(9)
Securities available for sale, fair value, total	12,311	12,133
Securities available for sale, unrealized losses, total	$ (118)	$ (64)
Number of held to maturity securities | Security	185	53
Securities held to maturity, less than 12 months, fair value	$ 517,101	$ 56,739
Securities held to maturity, less than 12 months, unrealized losses	(16,245)	(933)
Securities held to maturity, greater than 12 months, fair value	112,879	121,536
Securities held to maturity, greater than 12 months, unrealized losses	(14,845)	(6,197)
Securities held to maturity, fair value, total	629,980	178,275
Securities held to maturity, unrealized losses, total	$ (31,090)	$ (7,130)
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	148	16
States of the U.S. and Political Subdivisions [Member] | Greater than 12 Months [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities | Security	37	37
Other Debt Securities [Member]
Schedule Of Securities [Line Items]
Number of available for sale securities, Less than 1 year | Security	0	0
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, less than 12 months, fair value	$ 0	$ 0
Securities available for sale, less than 12 months, unrealized losses	0	0
Securities available for sale, 12 months or more, fair value	4,655	4,670
Securities available for sale, 12 months or more, unrealized losses	(261)	(243)
Securities available for sale, fair value, total	4,655	4,670
Securities available for sale, unrealized losses, total	$ (261)	$ (243)

SECURITIES - Additional Informa

SECURITIES - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Schedule Of Securities [Line Items]
Other than temporary impairment losses, investments, available-for-sale securities	$ 0	$ 0
Municipal bond portfolio, value	$ 960,200
Percentage of formal credit enhancement insurance of municipalities	62.00%
Municipal Bonds [Member] | Weighted Average [Member]
Schedule Of Securities [Line Items]
Average holding size of securities in bond portfolio	$ 3,000
Municipal Bonds [Member] | Credit Concentration Risk [Member] | General Obligation Bonds [Member] | A Rating [Member] | Minimum [Member]
Schedule Of Securities [Line Items]
Percentage of portfolio	100.00%
Municipal Bonds [Member] | Geographic Concentration Risk [Member] | Pennsylvania, Ohio and Maryland [Member]
Schedule Of Securities [Line Items]
Percentage of portfolio	65.00%

LOANS AND LEASES - Net of Unear

LOANS AND LEASES - Net of Unearned Income (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	$ 21,262,397	$ 20,998,766
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	8,811,475	8,741,864
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	4,279,969	4,170,667
Commercial Leases [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	279,582	266,720
Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	39,347	17,063
Total Commercial Loans and Leases [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	13,410,373	13,196,314
Direct Installment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	1,871,639	1,905,535
Residential Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	2,762,101	2,702,691
Indirect Installment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	1,524,501	1,448,433
Consumer Lines of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	1,693,783	1,745,793
Consumer Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	7,852,024	7,802,452
Originated Loans and Leases [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	16,000,597	15,345,490
Originated Loans and Leases [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	5,465,150	5,174,783
Originated Loans and Leases [Member] | Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	3,688,120	3,495,247
Originated Loans and Leases [Member] | Commercial Leases [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	279,582	266,720
Originated Loans and Leases [Member] | Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	39,347	17,063
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	9,472,199	8,953,813
Originated Loans and Leases [Member] | Direct Installment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	1,737,242	1,755,713
Originated Loans and Leases [Member] | Residential Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	2,131,338	2,036,226
Originated Loans and Leases [Member] | Indirect Installment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	1,524,330	1,448,268
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	1,135,488	1,151,470
Originated Loans and Leases [Member] | Consumer Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	6,528,398	6,391,677
Acquired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	5,261,800	5,653,276
Acquired Loans [Member] | Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	3,346,325	3,567,081
Acquired Loans [Member] | Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	591,849	675,420
Acquired Loans [Member] | Commercial Leases [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	0	0
Acquired Loans [Member] | Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	0	0
Acquired Loans [Member] | Total Commercial Loans and Leases [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	3,938,174	4,242,501
Acquired Loans [Member] | Direct Installment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	134,397	149,822
Acquired Loans [Member] | Residential Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	630,763	666,465
Acquired Loans [Member] | Indirect Installment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	171	165
Acquired Loans [Member] | Consumer Lines of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	558,295	594,323
Acquired Loans [Member] | Consumer Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	$ 1,323,626	$ 1,410,775

LOANS AND LEASES - Commercial R

LOANS AND LEASES - Commercial Real Estate Loans (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Loans and Leases Receivable Disclosure [Line Items]
Commercial construction, acquisition and development loans	$ 1,167,699	$ 1,170,175
Credit Concentration Risk [Member] | Commercial Construction Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Percent of total loans and leases	5.50%	5.60%
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	35.20%	35.30%
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	64.80%	64.70%

LOANS AND LEASES - Outstanding

LOANS AND LEASES - Outstanding Principal Balance and Carrying Amount of Acquired Loans (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount	$ 21,262,397	$ 20,998,766
Accounted for under ASC 310-30 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	4,853,516	5,176,015
Carrying amount	4,521,926	4,834,256
Accounted for under ASC 310-20 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	754,251	835,130
Carrying amount	733,037	812,322
Acquired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	5,607,767	6,011,145
Carrying amount	$ 5,254,963	$ 5,646,578

LOANS AND LEASES - Additional I

LOANS AND LEASES - Additional Information (Detail) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount	$ 21,262,397,000		$ 20,998,766,000
Reclassification from non-accretable difference	$ 64,216,000	$ 23,106,000
Sustained period of delinquency for impairment evaluation	90 years
Valuation for impairment of loans with pooled reserves	$ 500,000
Minimum amount to allocate specific valuation allowance	500,000
Interest income on impaired loans	1,600,000	$ 1,900,000
Restructured loans returned to performing status	1,200,000
Minimum reserves for commercial loan	500,000
Pooled reserves for all other classes of loans	$ 4,000,000		4,000,000
Maximum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due Period For Loan To Be In Default	12 months
Minimum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Past Due Period For Loan To Be In Default	90 days
Commercial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Threshold period past due for default non-accrual status of trade accounts receivable	90 days
Installment Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Threshold period past due for default non-accrual status of trade accounts receivable	120 days
Residential Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Threshold period past due for default non-accrual status of trade accounts receivable	180 days
Carrying value of OREO through foreclosure	$ 4,800,000		3,600,000
Mortgage loans on real estate, foreclosure	13,800,000		15,200,000
Purchased Credit-Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount	$ 1,700,000		$ 1,900,000
Purchased Credit-Impaired Loans [Member] | Credit Concentration Risk [Member] | Acquired Loans Receivable [Member] | Maximum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of portfolio			0.03%
Purchased Credit-Impaired Loans [Member] | Credit Concentration Risk [Member] | Acquired Loans Receivable [Member] | Minimum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of portfolio	0.03%

LOANS AND LEASES - Change in Ac

LOANS AND LEASES - Change in Accretable Yield of Acquired Loans (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Balance at beginning of period	$ 708,481	$ 467,070
Acquisitions	0	443,261
Reduction due to unexpected early payoffs	(25,833)	(20,560)
Reclass from non-accretable difference	64,216	23,106
Disposals/transfers	(57)	(36)
Other	(403)	0
Accretion	(59,079)	(25,241)
Balance at end of period	$ 687,325	$ 887,600

LOANS AND LEASES - Non-Performi

LOANS AND LEASES - Non-Performing Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled debt restructurings	$ 55,251	$ 53,991
Non-Performing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	77,684	74,635
Troubled debt restructurings	24,452	23,481
Total non-performing loans	102,136	98,116
Other real estate owned	40,980	40,606
Total non-performing assets	$ 143,116	$ 138,722
Non-performing loans / total loans and leases	0.48%	0.47%
Non-performing loans OREO / total loans and leases OREO	0.67%	0.66%
Non-performing assets / total assets	0.45%	0.44%

LOANS AND LEASES - Age Analysis

LOANS AND LEASES - Age Analysis of Past Due Loans (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	$ 21,262,397	$ 20,998,766
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	8,811,475	8,741,864
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	4,279,969	4,170,667
Commercial Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	279,582	266,720
Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	39,347	17,063
Total Commercial Loans and Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	13,410,373	13,196,314
Direct Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	1,871,639	1,905,535
Residential Mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	2,762,101	2,702,691
Indirect Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	1,524,501	1,448,433
Consumer Lines of Credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	1,693,783	1,745,793
Consumer Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	7,852,024	7,802,452
Originated Loans and Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	125,837	134,911
Non- Accrual	68,121	63,644
Current	15,874,760	15,210,579
Total Loans	16,000,597	15,345,490
Originated Loans and Leases [Member] | 30-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	50,412	62,146
Originated Loans and Leases [Member] | Equal to Greater than 90 Days Past Due and Still Accruing [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	7,304	9,121
Originated Loans and Leases [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	35,695	33,047
Non- Accrual	27,349	24,773
Current	5,429,455	5,141,736
Total Loans	5,465,150	5,174,783
Originated Loans and Leases [Member] | Commercial Real Estate [Member] | 30-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	8,345	8,273
Originated Loans and Leases [Member] | Commercial Real Estate [Member] | Equal to Greater than 90 Days Past Due and Still Accruing [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1	1
Originated Loans and Leases [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	26,501	26,028
Non- Accrual	19,705	17,077
Current	3,661,619	3,469,219
Total Loans	3,688,120	3,495,247
Originated Loans and Leases [Member] | Commercial and Industrial [Member] | 30-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	6,793	8,948
Originated Loans and Leases [Member] | Commercial and Industrial [Member] | Equal to Greater than 90 Days Past Due and Still Accruing [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	3	3
Originated Loans and Leases [Member] | Commercial Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	2,091	2,997
Non- Accrual	1,399	1,574
Current	277,491	263,723
Total Loans	279,582	266,720
Originated Loans and Leases [Member] | Commercial Leases [Member] | 30-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	692	1,382
Originated Loans and Leases [Member] | Commercial Leases [Member] | Equal to Greater than 90 Days Past Due and Still Accruing [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	41
Originated Loans and Leases [Member] | Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1,256	1,236
Non- Accrual	1,000	1,000
Current	38,091	15,827
Total Loans	39,347	17,063
Originated Loans and Leases [Member] | Other [Member] | 30-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	183	83
Originated Loans and Leases [Member] | Other [Member] | Equal to Greater than 90 Days Past Due and Still Accruing [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	73	153
Originated Loans and Leases [Member] | Total Commercial Loans and Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	65,543	63,308
Non- Accrual	49,453	44,424
Current	9,406,656	8,890,505
Total Loans	9,472,199	8,953,813
Originated Loans and Leases [Member] | Total Commercial Loans and Leases [Member] | 30-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	16,013	18,686
Originated Loans and Leases [Member] | Total Commercial Loans and Leases [Member] | Equal to Greater than 90 Days Past Due and Still Accruing [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	77	198
Originated Loans and Leases [Member] | Direct Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	20,453	26,554
Non- Accrual	8,411	8,896
Current	1,716,789	1,729,159
Total Loans	1,737,242	1,755,713
Originated Loans and Leases [Member] | Direct Installment [Member] | 30-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	8,129	13,192
Originated Loans and Leases [Member] | Direct Installment [Member] | Equal to Greater than 90 Days Past Due and Still Accruing [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	3,913	4,466
Originated Loans and Leases [Member] | Residential Mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	22,106	22,699
Non- Accrual	5,254	5,771
Current	2,109,232	2,013,527
Total Loans	2,131,338	2,036,226
Originated Loans and Leases [Member] | Residential Mortgages [Member] | 30-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	14,870	14,096
Originated Loans and Leases [Member] | Residential Mortgages [Member] | Equal to Greater than 90 Days Past Due and Still Accruing [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1,982	2,832
Originated Loans and Leases [Member] | Indirect Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	9,595	13,164
Non- Accrual	2,234	2,240
Current	1,514,735	1,435,104
Total Loans	1,524,330	1,448,268
Originated Loans and Leases [Member] | Indirect Installment [Member] | 30-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	6,850	10,313
Originated Loans and Leases [Member] | Indirect Installment [Member] | Equal to Greater than 90 Days Past Due and Still Accruing [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	511	611
Originated Loans and Leases [Member] | Consumer Lines of Credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	8,140	9,186
Non- Accrual	2,769	2,313
Current	1,127,348	1,142,284
Total Loans	1,135,488	1,151,470
Originated Loans and Leases [Member] | Consumer Lines of Credit [Member] | 30-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	4,550	5,859
Originated Loans and Leases [Member] | Consumer Lines of Credit [Member] | Equal to Greater than 90 Days Past Due and Still Accruing [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	821	1,014
Originated Loans and Leases [Member] | Consumer Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	60,294	71,603
Non- Accrual	18,668	19,220
Current	6,468,104	6,320,074
Total Loans	6,528,398	6,391,677
Originated Loans and Leases [Member] | Consumer Loan [Member] | 30-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	34,399	43,460
Originated Loans and Leases [Member] | Consumer Loan [Member] | Equal to Greater than 90 Days Past Due and Still Accruing [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	7,227	8,923
Acquired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	156,803	167,867
Non- Accrual	9,563	10,991
Current	5,379,218	5,768,610
(Discount) Premium	(274,221)	(283,201)
Total Loans	5,261,800	5,653,276
Acquired Loans [Member] | 30-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	61,128	66,926
Acquired Loans [Member] | Equal to Greater than 90 Days Past Due and Still Accruing [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	86,112	89,950
Acquired Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	100,982	101,995
Non- Accrual	3,735	3,975
Current	3,433,231	3,657,152
(Discount) Premium	(187,888)	(192,066)
Total Loans	3,346,325	3,567,081
Acquired Loans [Member] | Commercial Real Estate [Member] | 30-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	32,697	34,928
Acquired Loans [Member] | Commercial Real Estate [Member] | Equal to Greater than 90 Days Past Due and Still Accruing [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	64,550	63,092
Acquired Loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	14,404	15,302
Non- Accrual	4,652	5,663
Current	612,354	698,265
(Discount) Premium	(34,909)	(38,147)
Total Loans	591,849	675,420
Acquired Loans [Member] | Commercial and Industrial [Member] | 30-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	5,135	3,187
Acquired Loans [Member] | Commercial and Industrial [Member] | Equal to Greater than 90 Days Past Due and Still Accruing [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	4,617	6,452
Acquired Loans [Member] | Commercial Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	115,386	117,297
Non- Accrual	8,387	9,638
Current	4,045,585	4,355,417
(Discount) Premium	(222,797)	(230,213)
Total Loans	3,938,174	4,242,501
Acquired Loans [Member] | Commercial Loans [Member] | 30-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	37,832	38,115
Acquired Loans [Member] | Commercial Loans [Member] | Equal to Greater than 90 Days Past Due and Still Accruing [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	69,167	69,544
Acquired Loans [Member] | Commercial Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	0	0
Acquired Loans [Member] | Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	0	0
Acquired Loans [Member] | Total Commercial Loans and Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	3,938,174	4,242,501
Acquired Loans [Member] | Direct Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	4,572	7,280
Non- Accrual	0	0
Current	128,754	141,386
(Discount) Premium	1,071	1,156
Total Loans	134,397	149,822
Acquired Loans [Member] | Direct Installment [Member] | 30-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	2,826	5,267
Acquired Loans [Member] | Direct Installment [Member] | Equal to Greater than 90 Days Past Due and Still Accruing [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1,746	2,013
Acquired Loans [Member] | Residential Mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	28,172	32,330
Non- Accrual	0	0
Current	642,966	675,499
(Discount) Premium	(40,375)	(41,364)
Total Loans	630,763	666,465
Acquired Loans [Member] | Residential Mortgages [Member] | 30-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	15,113	17,191
Acquired Loans [Member] | Residential Mortgages [Member] | Equal to Greater than 90 Days Past Due and Still Accruing [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	13,059	15,139
Acquired Loans [Member] | Indirect Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1	1
Non- Accrual	0	0
Current	7	10
(Discount) Premium	163	154
Total Loans	171	165
Acquired Loans [Member] | Indirect Installment [Member] | 30-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	0
Acquired Loans [Member] | Indirect Installment [Member] | Equal to Greater than 90 Days Past Due and Still Accruing [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1	1
Acquired Loans [Member] | Consumer Lines of Credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	8,672	10,959
Non- Accrual	1,176	1,353
Current	561,906	596,298
(Discount) Premium	(12,283)	(12,934)
Total Loans	558,295	594,323
Acquired Loans [Member] | Consumer Lines of Credit [Member] | 30-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	5,357	6,353
Acquired Loans [Member] | Consumer Lines of Credit [Member] | Equal to Greater than 90 Days Past Due and Still Accruing [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	2,139	3,253
Acquired Loans [Member] | Consumer Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	41,417	50,570
Non- Accrual	1,176	1,353
Current	1,333,633	1,413,193
(Discount) Premium	(51,424)	(52,988)
Total Loans	1,323,626	1,410,775
Acquired Loans [Member] | Consumer Loan [Member] | 30-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	23,296	28,811
Acquired Loans [Member] | Consumer Loan [Member] | Equal to Greater than 90 Days Past Due and Still Accruing [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	$ 16,945	$ 20,406

LOANS AND LEASES - Commercial L

LOANS AND LEASES - Commercial Loans and Leases by Credit Quality (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	$ 21,262,397	$ 20,998,766
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	8,811,475	8,741,864
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	4,279,969	4,170,667
Commercial Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	279,582	266,720
Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	39,347	17,063
Total Commercial Loans and Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	13,410,373	13,196,314
Originated Loans and Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	16,000,597	15,345,490
Originated Loans and Leases [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	5,465,150	5,174,783
Originated Loans and Leases [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	3,688,120	3,495,247
Originated Loans and Leases [Member] | Commercial Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	279,582	266,720
Originated Loans and Leases [Member] | Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	39,347	17,063
Originated Loans and Leases [Member] | Total Commercial Loans and Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	9,472,199	8,953,813
Acquired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	5,261,800	5,653,276
Acquired Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	3,346,325	3,567,081
Acquired Loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	591,849	675,420
Acquired Loans [Member] | Commercial Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	0	0
Acquired Loans [Member] | Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	0	0
Acquired Loans [Member] | Total Commercial Loans and Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	3,938,174	4,242,501
Pass [Member] | Originated Loans and Leases [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	5,195,183	4,922,872
Pass [Member] | Originated Loans and Leases [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	3,412,745	3,266,966
Pass [Member] | Originated Loans and Leases [Member] | Commercial Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	269,837	260,235
Pass [Member] | Originated Loans and Leases [Member] | Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	38,231	15,866
Pass [Member] | Originated Loans and Leases [Member] | Total Commercial Loans and Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	8,915,996	8,465,939
Pass [Member] | Acquired Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	2,877,345	3,102,788
Pass [Member] | Acquired Loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	520,361	603,611
Pass [Member] | Acquired Loans [Member] | Total Commercial Loans and Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	3,397,706	3,706,399
Special Mention [Member] | Originated Loans and Leases [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	148,120	152,744
Special Mention [Member] | Originated Loans and Leases [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	191,627	132,975
Special Mention [Member] | Originated Loans and Leases [Member] | Commercial Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	3,518	4,425
Special Mention [Member] | Originated Loans and Leases [Member] | Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	43	43
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	343,308	290,187
Special Mention [Member] | Acquired Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	225,364	250,987
Special Mention [Member] | Acquired Loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	28,166	26,059
Special Mention [Member] | Acquired Loans [Member] | Total Commercial Loans and Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	253,530	277,046
Substandard [Member] | Originated Loans and Leases [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	121,542	98,728
Substandard [Member] | Originated Loans and Leases [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	80,803	92,091
Substandard [Member] | Originated Loans and Leases [Member] | Commercial Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	6,227	2,060
Substandard [Member] | Originated Loans and Leases [Member] | Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	1,073	1,154
Substandard [Member] | Originated Loans and Leases [Member] | Total Commercial Loans and Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	209,645	194,033
Substandard [Member] | Acquired Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	243,402	213,089
Substandard [Member] | Acquired Loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	43,314	45,661
Substandard [Member] | Acquired Loans [Member] | Total Commercial Loans and Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	286,716	258,750
Doubtful [Member] | Originated Loans and Leases [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	305	439
Doubtful [Member] | Originated Loans and Leases [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	2,945	3,215
Doubtful [Member] | Originated Loans and Leases [Member] | Commercial Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	0	0
Doubtful [Member] | Originated Loans and Leases [Member] | Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	0	0
Doubtful [Member] | Originated Loans and Leases [Member] | Total Commercial Loans and Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	3,250	3,654
Doubtful [Member] | Acquired Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	214	217
Doubtful [Member] | Acquired Loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	8	89
Doubtful [Member] | Acquired Loans [Member] | Total Commercial Loans and Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	$ 222	$ 306

LOANS AND LEASES - Consumer Loa

LOANS AND LEASES - Consumer Loans by Payment Status (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Credit Quality [Line Items]
Carrying amount	$ 21,262,397	$ 20,998,766
Direct Installment [Member]
Credit Quality [Line Items]
Carrying amount	1,871,639	1,905,535
Residential Mortgages [Member]
Credit Quality [Line Items]
Carrying amount	2,762,101	2,702,691
Indirect Installment [Member]
Credit Quality [Line Items]
Carrying amount	1,524,501	1,448,433
Originated Loans and Leases [Member]
Credit Quality [Line Items]
Carrying amount	16,000,597	15,345,490
Originated Loans and Leases [Member] | Direct Installment [Member]
Credit Quality [Line Items]
Carrying amount	1,737,242	1,755,713
Originated Loans and Leases [Member] | Residential Mortgages [Member]
Credit Quality [Line Items]
Carrying amount	2,131,338	2,036,226
Originated Loans and Leases [Member] | Indirect Installment [Member]
Credit Quality [Line Items]
Carrying amount	1,524,330	1,448,268
Acquired Loans [Member]
Credit Quality [Line Items]
Carrying amount	5,261,800	5,653,276
Acquired Loans [Member] | Direct Installment [Member]
Credit Quality [Line Items]
Carrying amount	134,397	149,822
Acquired Loans [Member] | Residential Mortgages [Member]
Credit Quality [Line Items]
Carrying amount	630,763	666,465
Acquired Loans [Member] | Indirect Installment [Member]
Credit Quality [Line Items]
Carrying amount	171	165
Consumer Loan [Member] | Originated Loans and Leases [Member]
Credit Quality [Line Items]
Carrying amount	6,528,398	6,391,677
Consumer Loan [Member] | Originated Loans and Leases [Member] | Performing [Member]
Credit Quality [Line Items]
Carrying amount	6,489,677	6,352,285
Consumer Loan [Member] | Originated Loans and Leases [Member] | Non-Performing [Member]
Credit Quality [Line Items]
Carrying amount	38,721	39,392
Consumer Loan [Member] | Originated Loans and Leases [Member] | Direct Installment [Member]
Credit Quality [Line Items]
Carrying amount	1,737,242	1,755,713
Consumer Loan [Member] | Originated Loans and Leases [Member] | Direct Installment [Member] | Performing [Member]
Credit Quality [Line Items]
Carrying amount	1,721,589	1,739,060
Consumer Loan [Member] | Originated Loans and Leases [Member] | Direct Installment [Member] | Non-Performing [Member]
Credit Quality [Line Items]
Carrying amount	15,653	16,653
Consumer Loan [Member] | Originated Loans and Leases [Member] | Residential Mortgages [Member]
Credit Quality [Line Items]
Carrying amount	2,131,338	2,036,226
Consumer Loan [Member] | Originated Loans and Leases [Member] | Residential Mortgages [Member] | Performing [Member]
Credit Quality [Line Items]
Carrying amount	2,115,204	2,019,816
Consumer Loan [Member] | Originated Loans and Leases [Member] | Residential Mortgages [Member] | Non-Performing [Member]
Credit Quality [Line Items]
Carrying amount	16,134	16,410
Consumer Loan [Member] | Originated Loans and Leases [Member] | Indirect Installment [Member]
Credit Quality [Line Items]
Carrying amount	1,524,330	1,448,268
Consumer Loan [Member] | Originated Loans and Leases [Member] | Indirect Installment [Member] | Performing [Member]
Credit Quality [Line Items]
Carrying amount	1,521,906	1,445,833
Consumer Loan [Member] | Originated Loans and Leases [Member] | Indirect Installment [Member] | Non-Performing [Member]
Credit Quality [Line Items]
Carrying amount	2,424	2,435
Consumer Loan [Member] | Originated Loans and Leases [Member] | Consumer Lines of Credit [Member]
Credit Quality [Line Items]
Carrying amount	1,135,488	1,151,470
Consumer Loan [Member] | Originated Loans and Leases [Member] | Consumer Lines of Credit [Member] | Performing [Member]
Credit Quality [Line Items]
Carrying amount	1,130,978	1,147,576
Consumer Loan [Member] | Originated Loans and Leases [Member] | Consumer Lines of Credit [Member] | Non-Performing [Member]
Credit Quality [Line Items]
Carrying amount	4,510	3,894
Consumer Loan [Member] | Acquired Loans [Member]
Credit Quality [Line Items]
Carrying amount	1,323,626	1,410,775
Consumer Loan [Member] | Acquired Loans [Member] | Performing [Member]
Credit Quality [Line Items]
Carrying amount	1,321,894	1,408,765
Consumer Loan [Member] | Acquired Loans [Member] | Non-Performing [Member]
Credit Quality [Line Items]
Carrying amount	1,732	2,010
Consumer Loan [Member] | Acquired Loans [Member] | Direct Installment [Member]
Credit Quality [Line Items]
Carrying amount	134,397	149,822
Consumer Loan [Member] | Acquired Loans [Member] | Direct Installment [Member] | Performing [Member]
Credit Quality [Line Items]
Carrying amount	134,327	149,751
Consumer Loan [Member] | Acquired Loans [Member] | Direct Installment [Member] | Non-Performing [Member]
Credit Quality [Line Items]
Carrying amount	70	71
Consumer Loan [Member] | Acquired Loans [Member] | Residential Mortgages [Member]
Credit Quality [Line Items]
Carrying amount	630,763	666,465
Consumer Loan [Member] | Acquired Loans [Member] | Residential Mortgages [Member] | Performing [Member]
Credit Quality [Line Items]
Carrying amount	630,763	666,465
Consumer Loan [Member] | Acquired Loans [Member] | Residential Mortgages [Member] | Non-Performing [Member]
Credit Quality [Line Items]
Carrying amount	0	0
Consumer Loan [Member] | Acquired Loans [Member] | Indirect Installment [Member]
Credit Quality [Line Items]
Carrying amount	171	165
Consumer Loan [Member] | Acquired Loans [Member] | Indirect Installment [Member] | Performing [Member]
Credit Quality [Line Items]
Carrying amount	171	165
Consumer Loan [Member] | Acquired Loans [Member] | Indirect Installment [Member] | Non-Performing [Member]
Credit Quality [Line Items]
Carrying amount	0	0
Consumer Loan [Member] | Acquired Loans [Member] | Consumer Lines of Credit [Member]
Credit Quality [Line Items]
Carrying amount	558,295	594,323
Consumer Loan [Member] | Acquired Loans [Member] | Consumer Lines of Credit [Member] | Performing [Member]
Credit Quality [Line Items]
Carrying amount	556,633	592,384
Consumer Loan [Member] | Acquired Loans [Member] | Consumer Lines of Credit [Member] | Non-Performing [Member]
Credit Quality [Line Items]
Carrying amount	$ 1,662	$ 1,939

LOANS AND LEASES - Impaired Loa

LOANS AND LEASES - Impaired Loans and Lease (Detail) - Originated Loans and Leases [Member] - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	$ 104,434	$ 106,476
Recorded Investment With No Specific Reserve	81,457	74,309
Recorded Investment With Specific Reserve	6,758	7,363
Total Recorded Investment	88,215	81,672
Specific Reserve	3,250	3,654
Average Recorded Investment	87,009	88,636
Commercial Real Estate [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	30,584	27,718
Recorded Investment With No Specific Reserve	25,478	21,748
Recorded Investment With Specific Reserve	1,751	2,906
Total Recorded Investment	27,229	24,654
Specific Reserve	305	439
Average Recorded Investment	25,988	24,413
Commercial and Industrial [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	26,034	29,307
Recorded Investment With No Specific Reserve	15,859	11,595
Recorded Investment With Specific Reserve	5,007	4,457
Total Recorded Investment	20,866	16,052
Specific Reserve	2,945	3,215
Average Recorded Investment	20,479	23,907
Commercial Leases [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	1,399	1,574
Recorded Investment With No Specific Reserve	1,399	1,574
Recorded Investment With Specific Reserve	0	0
Total Recorded Investment	1,399	1,574
Specific Reserve	0	0
Average Recorded Investment	1,486	1,386
Other [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	0	0
Recorded Investment With No Specific Reserve	0	0
Recorded Investment With Specific Reserve	0	0
Total Recorded Investment	0	0
Specific Reserve	0	0
Average Recorded Investment	0	0
Total Commercial Loans and Leases [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	58,017	58,599
Recorded Investment With No Specific Reserve	42,736	34,917
Recorded Investment With Specific Reserve	6,758	7,363
Total Recorded Investment	49,494	42,280
Specific Reserve	3,250	3,654
Average Recorded Investment	47,953	49,706
Direct Installment [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	18,623	19,375
Recorded Investment With No Specific Reserve	15,653	16,653
Recorded Investment With Specific Reserve	0	0
Total Recorded Investment	15,653	16,653
Specific Reserve	0	0
Average Recorded Investment	16,153	16,852
Residential Mortgages [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	17,448	17,754
Recorded Investment With No Specific Reserve	16,134	16,410
Recorded Investment With Specific Reserve	0	0
Total Recorded Investment	16,134	16,410
Specific Reserve	0	0
Average Recorded Investment	16,272	15,984
Indirect Installment [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	4,648	5,709
Recorded Investment With No Specific Reserve	2,424	2,435
Recorded Investment With Specific Reserve	0	0
Total Recorded Investment	2,424	2,435
Specific Reserve	0	0
Average Recorded Investment	2,429	2,279
Consumer Lines of Credit [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	5,698	5,039
Recorded Investment With No Specific Reserve	4,510	3,894
Recorded Investment With Specific Reserve	0	0
Total Recorded Investment	4,510	3,894
Specific Reserve	0	0
Average Recorded Investment	4,202	3,815
Consumer Loan [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	46,417	47,877
Recorded Investment With No Specific Reserve	38,721	39,392
Recorded Investment With Specific Reserve	0	0
Total Recorded Investment	38,721	39,392
Specific Reserve	0	0
Average Recorded Investment	$ 39,056	$ 38,930

LOANS AND LEASES - Additional A

LOANS AND LEASES - Additional Allowance for Credit Losses Relating to Acquired Loans (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Total allowance on acquired loans	$ 179,247	$ 175,380	$ 160,782	$ 158,059
Acquired Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total allowance on acquired loans	6,837	6,698	$ 6,568	$ 7,268
Acquired Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total allowance on acquired loans	2,732	4,976
Acquired Loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total allowance on acquired loans	1,785	(415)
Acquired Loans [Member] | Total Commercial Loans and Leases [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total allowance on acquired loans	4,517	4,561
Acquired Loans [Member] | Direct Installment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total allowance on acquired loans	1,804	1,553
Acquired Loans [Member] | Residential Mortgages [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total allowance on acquired loans	518	484
Acquired Loans [Member] | Indirect Installment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total allowance on acquired loans	240	177
Acquired Loans [Member] | Consumer Lines of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total allowance on acquired loans	(242)	(77)
Acquired Loans [Member] | Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total allowance on acquired loans	$ 2,320	$ 2,137

LOANS AND LEASES - Summary of P

LOANS AND LEASES - Summary of Payment Status of TDRs (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings ("TDRs")	$ 55,251	$ 53,991
Originated Loans and Leases [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings ("TDRs")	51,476	50,183
Acquired Loans [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings ("TDRs")	3,775	3,808
Performing [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings ("TDRs")	19,774	19,804
Performing [Member] | Originated Loans and Leases [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings ("TDRs")	19,525	19,538
Performing [Member] | Acquired Loans [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings ("TDRs")	249	266
Non-Performing [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings ("TDRs")	24,452	23,481
Non-Performing [Member] | Originated Loans and Leases [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings ("TDRs")	21,283	20,173
Non-Performing [Member] | Acquired Loans [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings ("TDRs")	3,169	3,308
Non-Accrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings ("TDRs")	11,025	10,706
Non-Accrual [Member] | Originated Loans and Leases [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings ("TDRs")	10,668	10,472
Non-Accrual [Member] | Acquired Loans [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings ("TDRs")	$ 357	$ 234

LOANS AND LEASES - Reserve for

LOANS AND LEASES - Reserve for Commercial TDRs Included in Allowance for Credit Losses (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Financing Receivable, Modifications [Line Items]
Total allowance on acquired loans	$ 179,247	$ 175,380	$ 160,782	$ 158,059
Specific Reserves for Commercial TDRs [Member] | Total Commercial Loans and Leases [Member]
Financing Receivable, Modifications [Line Items]
Total allowance on acquired loans	726	95
Pooled Reserves for Individual Commercial Loans [Member] | Total Commercial Loans and Leases [Member]
Financing Receivable, Modifications [Line Items]
Total allowance on acquired loans	$ 519	$ 469

LOANS AND LEASES - Troubled Deb

LOANS AND LEASES - Troubled Debt Restructurings (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)Contract	Mar. 31, 2017USD ($)Contract
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	225	207
Pre- Modification Outstanding Recorded Investment	$ 4,016	$ 2,524
Post- Modification Outstanding Recorded Investment	$ 3,417	$ 2,440
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	1	1
Pre- Modification Outstanding Recorded Investment	$ 328	$ 114
Post- Modification Outstanding Recorded Investment	$ 328	$ 109
Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	1	0
Pre- Modification Outstanding Recorded Investment	$ 1,687	$ 0
Post- Modification Outstanding Recorded Investment	$ 1,230	$ 0
Total Commercial Loans and Leases [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	2	1
Pre- Modification Outstanding Recorded Investment	$ 2,015	$ 114
Post- Modification Outstanding Recorded Investment	$ 1,558	$ 109
Direct Installment [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	182	171
Pre- Modification Outstanding Recorded Investment	$ 1,135	$ 1,488
Post- Modification Outstanding Recorded Investment	$ 1,056	$ 1,412
Residential Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	11	8
Pre- Modification Outstanding Recorded Investment	$ 501	$ 163
Post- Modification Outstanding Recorded Investment	$ 504	$ 176
Indirect Installment [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	9	5
Pre- Modification Outstanding Recorded Investment	$ 13	$ 17
Post- Modification Outstanding Recorded Investment	$ 12	$ 14
Consumer Lines of Credit [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	21	22
Pre- Modification Outstanding Recorded Investment	$ 352	$ 742
Post- Modification Outstanding Recorded Investment	$ 287	$ 729
Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	223	206
Pre- Modification Outstanding Recorded Investment	$ 2,001	$ 2,410
Post- Modification Outstanding Recorded Investment	$ 1,859	$ 2,331

LOANS AND LEASES - Originated T

LOANS AND LEASES - Originated Troubled Debt Restructurings, Payment Default (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)Contract	Mar. 31, 2017USD ($)Contract
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	55	38
Recorded Investment | $	$ 526	$ 350
Direct Installment [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	45	29
Recorded Investment | $	$ 130	$ 82
Residential Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	4	2
Recorded Investment | $	$ 190	$ 224
Indirect Installment [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	5	6
Recorded Investment | $	$ 10	$ 10
Consumer Lines of Credit [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	1	1
Recorded Investment | $	$ 196	$ 34
Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	55	38
Recorded Investment | $	$ 526	$ 350

ALLOWANCE FOR CREDIT LOSSES - C

ALLOWANCE FOR CREDIT LOSSES - Changes in Allowance for Credit Losses (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	$ 175,380	$ 158,059
Charge- Offs	(13,911)	(11,294)
Recoveries	3,283	3,167
Net Charge- Offs	(10,628)	(8,127)
Provision for credit losses	14,495	10,850
Balance at End of Period	179,247	160,782
Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	168,682	150,791
Charge- Offs	(13,602)	(10,812)
Recoveries	2,560	2,898
Net Charge- Offs	(11,042)	(7,914)
Provision for credit losses	14,770	11,337
Balance at End of Period	172,410	154,214
Acquired Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	6,698	7,268
Charge- Offs	(309)	(482)
Recoveries	723	269
Net Charge- Offs	414	(213)
Provision for credit losses	(275)	(487)
Balance at End of Period	6,837	6,568
Commercial Real Estate [Member] | Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	50,281	46,635
Charge- Offs	(225)	(988)
Recoveries	337	361
Net Charge- Offs	112	(627)
Provision for credit losses	3,123	381
Balance at End of Period	53,516	46,389
Commercial Real Estate [Member] | Acquired Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	4,976
Balance at End of Period	2,732
Commercial and Industrial [Member] | Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	51,963	47,991
Charge- Offs	(5,920)	(2,463)
Recoveries	369	474
Net Charge- Offs	(5,551)	(1,989)
Provision for credit losses	6,601	7,568
Balance at End of Period	53,013	53,570
Commercial and Industrial [Member] | Acquired Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	(415)
Balance at End of Period	1,785
Commercial Leases [Member] | Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	5,646	3,280
Charge- Offs	(171)	(506)
Recoveries	10	1
Net Charge- Offs	(161)	(505)
Provision for credit losses	630	738
Balance at End of Period	6,115	3,513
Other [Member] | Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	1,843	1,392
Charge- Offs	(797)	(973)
Recoveries	297	327
Net Charge- Offs	(500)	(646)
Provision for credit losses	652	1,063
Balance at End of Period	1,995	1,809
Total Commercial Loans and Leases [Member] | Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	109,733	99,298
Charge- Offs	(7,113)	(4,930)
Recoveries	1,013	1,163
Net Charge- Offs	(6,100)	(3,767)
Provision for credit losses	11,006	9,750
Balance at End of Period	114,639	105,281
Total Commercial Loans and Leases [Member] | Acquired Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	4,561
Balance at End of Period	4,517
Direct Installment [Member] | Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	20,936	21,391
Charge- Offs	(3,470)	(2,874)
Recoveries	440	628
Net Charge- Offs	(3,030)	(2,246)
Provision for credit losses	2,222	1,065
Balance at End of Period	20,128	20,210
Direct Installment [Member] | Acquired Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	1,553
Balance at End of Period	1,804
Residential Mortgages [Member] | Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	15,507	10,082
Charge- Offs	(79)	(180)
Recoveries	91	161
Net Charge- Offs	12	(19)
Provision for credit losses	(239)	147
Balance at End of Period	15,280	10,210
Residential Mortgages [Member] | Acquired Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	484
Balance at End of Period	518
Indirect Installment [Member] | Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	11,967	10,564
Charge- Offs	(2,409)	(2,370)
Recoveries	895	781
Net Charge- Offs	(1,514)	(1,589)
Provision for credit losses	1,502	655
Balance at End of Period	11,955	9,630
Indirect Installment [Member] | Acquired Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	177
Balance at End of Period	240
Consumer Lines of Credit [Member] | Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	10,539	9,456
Charge- Offs	(531)	(458)
Recoveries	121	165
Net Charge- Offs	(410)	(293)
Provision for credit losses	279	(280)
Balance at End of Period	10,408	8,883
Consumer Lines of Credit [Member] | Acquired Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	(77)
Balance at End of Period	(242)
Consumer Loan [Member] | Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	58,949	51,493
Charge- Offs	(6,489)	(5,882)
Recoveries	1,547	1,735
Net Charge- Offs	(4,942)	(4,147)
Provision for credit losses	3,764	1,587
Balance at End of Period	57,771	48,933
Consumer Loan [Member] | Acquired Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	2,137
Balance at End of Period	2,320
Purchased Credit-Impaired Loans [Member] | Acquired Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	635	572
Charge- Offs	0	0
Recoveries	0	0
Net Charge- Offs	0	0
Provision for credit losses	(13)	88
Balance at End of Period	622	660
Other Acquired Loans [Member] | Acquired Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	6,063	6,696
Charge- Offs	(309)	(482)
Recoveries	723	269
Net Charge- Offs	414	(213)
Provision for credit losses	(262)	(575)
Balance at End of Period	$ 6,215	$ 5,908

ALLOWANCE FOR CREDIT LOSSES - I

ALLOWANCE FOR CREDIT LOSSES - Individual and Collective Allowance for Credit Losses (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Valuation Allowance [Line Items]
Originated loans and leases outstanding, loans and leases	$ 21,262,397	$ 20,998,766
Commercial Real Estate [Member]
Valuation Allowance [Line Items]
Originated loans and leases outstanding, loans and leases	8,811,475	8,741,864
Commercial and Industrial [Member]
Valuation Allowance [Line Items]
Originated loans and leases outstanding, loans and leases	4,279,969	4,170,667
Commercial Leases [Member]
Valuation Allowance [Line Items]
Originated loans and leases outstanding, loans and leases	279,582	266,720
Other [Member]
Valuation Allowance [Line Items]
Originated loans and leases outstanding, loans and leases	39,347	17,063
Total Commercial Loans and Leases [Member]
Valuation Allowance [Line Items]
Originated loans and leases outstanding, loans and leases	13,410,373	13,196,314
Direct Installment [Member]
Valuation Allowance [Line Items]
Originated loans and leases outstanding, loans and leases	1,871,639	1,905,535
Residential Mortgages [Member]
Valuation Allowance [Line Items]
Originated loans and leases outstanding, loans and leases	2,762,101	2,702,691
Indirect Installment [Member]
Valuation Allowance [Line Items]
Originated loans and leases outstanding, loans and leases	1,524,501	1,448,433
Consumer Lines of Credit [Member]
Valuation Allowance [Line Items]
Originated loans and leases outstanding, loans and leases	1,693,783	1,745,793
Consumer Loan [Member]
Valuation Allowance [Line Items]
Originated loans and leases outstanding, loans and leases	7,852,024	7,802,452
Originated Loans and Leases [Member]
Valuation Allowance [Line Items]
Originated allowance, individually evaluated for impairment	3,250	3,654
Originated allowance, collectively evaluated for impairment	169,160	165,028
Originated loans and leases outstanding, loans and leases	16,000,597	15,345,490
Originated loans and leases outstanding, individually evaluated for impairment	23,172	20,986
Originated loans and leases outstanding, collectively evaluated for impairment	15,977,425	15,324,504
Originated Loans and Leases [Member] | Commercial Real Estate [Member]
Valuation Allowance [Line Items]
Originated allowance, individually evaluated for impairment	305	439
Originated allowance, collectively evaluated for impairment	53,211	49,842
Originated loans and leases outstanding, loans and leases	5,465,150	5,174,783
Originated loans and leases outstanding, individually evaluated for impairment	12,292	11,114
Originated loans and leases outstanding, collectively evaluated for impairment	5,452,858	5,163,669
Originated Loans and Leases [Member] | Commercial and Industrial [Member]
Valuation Allowance [Line Items]
Originated allowance, individually evaluated for impairment	2,945	3,215
Originated allowance, collectively evaluated for impairment	50,068	48,748
Originated loans and leases outstanding, loans and leases	3,688,120	3,495,247
Originated loans and leases outstanding, individually evaluated for impairment	10,880	9,872
Originated loans and leases outstanding, collectively evaluated for impairment	3,677,240	3,485,375
Originated Loans and Leases [Member] | Commercial Leases [Member]
Valuation Allowance [Line Items]
Originated allowance, individually evaluated for impairment	0	0
Originated allowance, collectively evaluated for impairment	6,115	5,646
Originated loans and leases outstanding, loans and leases	279,582	266,720
Originated loans and leases outstanding, individually evaluated for impairment	0	0
Originated loans and leases outstanding, collectively evaluated for impairment	279,582	266,720
Originated Loans and Leases [Member] | Other [Member]
Valuation Allowance [Line Items]
Originated allowance, individually evaluated for impairment	0	0
Originated allowance, collectively evaluated for impairment	1,995	1,843
Originated loans and leases outstanding, loans and leases	39,347	17,063
Originated loans and leases outstanding, individually evaluated for impairment	0	0
Originated loans and leases outstanding, collectively evaluated for impairment	39,347	17,063
Originated Loans and Leases [Member] | Total Commercial Loans and Leases [Member]
Valuation Allowance [Line Items]
Originated allowance, individually evaluated for impairment	3,250	3,654
Originated allowance, collectively evaluated for impairment	111,389	106,079
Originated loans and leases outstanding, loans and leases	9,472,199	8,953,813
Originated loans and leases outstanding, individually evaluated for impairment	23,172	20,986
Originated loans and leases outstanding, collectively evaluated for impairment	9,449,027	8,932,827
Originated Loans and Leases [Member] | Direct Installment [Member]
Valuation Allowance [Line Items]
Originated allowance, individually evaluated for impairment	0	0
Originated allowance, collectively evaluated for impairment	20,128	20,936
Originated loans and leases outstanding, loans and leases	1,737,242	1,755,713
Originated loans and leases outstanding, individually evaluated for impairment	0	0
Originated loans and leases outstanding, collectively evaluated for impairment	1,737,242	1,755,713
Originated Loans and Leases [Member] | Residential Mortgages [Member]
Valuation Allowance [Line Items]
Originated allowance, individually evaluated for impairment	0	0
Originated allowance, collectively evaluated for impairment	15,280	15,507
Originated loans and leases outstanding, loans and leases	2,131,338	2,036,226
Originated loans and leases outstanding, individually evaluated for impairment	0	0
Originated loans and leases outstanding, collectively evaluated for impairment	2,131,338	2,036,226
Originated Loans and Leases [Member] | Indirect Installment [Member]
Valuation Allowance [Line Items]
Originated allowance, individually evaluated for impairment	0	0
Originated allowance, collectively evaluated for impairment	11,955	11,967
Originated loans and leases outstanding, loans and leases	1,524,330	1,448,268
Originated loans and leases outstanding, individually evaluated for impairment	0	0
Originated loans and leases outstanding, collectively evaluated for impairment	1,524,330	1,448,268
Originated Loans and Leases [Member] | Consumer Lines of Credit [Member]
Valuation Allowance [Line Items]
Originated allowance, individually evaluated for impairment	0	0
Originated allowance, collectively evaluated for impairment	10,408	10,539
Originated loans and leases outstanding, loans and leases	1,135,488	1,151,470
Originated loans and leases outstanding, individually evaluated for impairment	0	0
Originated loans and leases outstanding, collectively evaluated for impairment	1,135,488	1,151,470
Originated Loans and Leases [Member] | Consumer Loan [Member]
Valuation Allowance [Line Items]
Originated allowance, individually evaluated for impairment	0	0
Originated allowance, collectively evaluated for impairment	57,771	58,949
Originated loans and leases outstanding, loans and leases	6,528,398	6,391,677
Originated loans and leases outstanding, individually evaluated for impairment	0	0
Originated loans and leases outstanding, collectively evaluated for impairment	$ 6,528,398	$ 6,391,677

LOAN SERVICING - Mortgage Servi

LOAN SERVICING - Mortgage Servicing Rights Activity (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Mortgage Servicing Rights [Member]
Servicing Assets at Fair Value [Line Items]
Mortgage loans sold with servicing retained	$ 3,417,642		$ 3,256,548
Mortgage loans sold with servicing retained	236,893	$ 129,843
Pretax gains resulting from above loan sales	3,798	3,638
Mortgage servicing fees	2,174	1,603
Servicing Asset at Amortized Cost, Balance [Roll Forward]
Balance at beginning of period	29,053	13,521
Fair value of MSRs acquired	0	8,553
Additions	2,710	1,454
Payoffs and curtailments	(405)	(139)
Amortization	(567)	(523)
Balance at end of period	30,791	22,866
Loan servicing rights, fair value, start	32,419	17,546
Loan servicing rights, fair value, end	36,445	26,962
Small Business Administration Loans [Member]
Servicing Assets at Fair Value [Line Items]
Mortgage loans sold with servicing retained	300,857		$ 305,977
Mortgage loans sold with servicing retained	12,288	0
Pretax gains resulting from above loan sales	1,101	0
Servicing Asset at Amortized Cost, Balance [Roll Forward]
Balance at beginning of period	5,058	0
Additions	388	0
Amortization	(294)	(60)
Balance at end of period	5,062	5,339
Loan servicing rights, fair value, start	5,058	0
Loan servicing rights, fair value, end	$ 5,062	$ 5,339

LOAN SERVICING - Activity in SB

LOAN SERVICING - Activity in SBA-Guaranteed Loan Servicing Asset (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Servicing Assets at Fair Value [Line Items]
SBA servicing fees	$ 30,077	$ 24,581
SBA-Guaranteed Loan Servicing [Member]
Servicing Assets at Fair Value [Line Items]
Valuation Allowance for Impairment of Recognized Servicing Assets, Balance	400
SBA loans sold to investors with servicing retained	300,857		$ 305,977
SBA loans sold with servicing retained	12,288	0
Gain from sale of SBA loan, pretax	1,101	0
SBA servicing fees	750	115
Servicing Asset at Fair Value, Amount [Roll Forward]
Balance at beginning of period	5,058	0
Fair value of servicing rights acquired	0	5,399
Additions	388	0
Impairment (charge) / recovery	(90)	0
Amortization	(294)	(60)
Balance at end of period	5,062	5,339
Loan servicing rights, fair value, start	5,058	0
Loan servicing rights, fair value, end	$ 5,062	$ 5,339

LOAN SERVICING - Sensitivity of

LOAN SERVICING - Sensitivity of Fair Value to Changes in key Assumptions (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Mortgage Servicing Rights [Member]
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)	84 months 16 days		80 months 12 days
Constant prepayment rate (annualized)	9.10%		9.90%
Discount rate	9.90%		9.90%
Sensitivity analysis of fair value, change in interest rates, plus .25%	$ 1,179		$ 1,737
Sensitivity analysis of fair value, change in interest rates, plus .50%	2,131		3,220
Sensitivity analysis of fair value, change in interest rates, minus .25%	1,476		1,937
Sensitivity analysis of fair value, change in interest rates, minus .50%	$ 3,237		$ 4,007
SBA-Guaranteed Loan Servicing [Member]
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)	61 months		63 months 16 days
Constant prepayment rate (annualized)	10.01%	9.29%
Discount rate	14.76%	14.87%
Effect on fair value due to 10% adverse change of consistent repayment rate	$ (158)		$ (145)
Effect on fair value due to 20% adverse change of consistent repayment rate	(309)		(284)
Sensitivity analysis of fair value, transferor's interests in transferred financial assets, impact of 1 percent adverse change in prepayment speed	0		0
Sensitivity analysis of fair value, transferor's interests in transferred financial assets, impact of 2 percent adverse change in prepayment speed	0		0
Effect on fair value due to 10% adverse change of discount rate	0		0
Effect on fair value due to 20% adverse change of discount rate	0		0
Sensitivity analysis of fair value, transferor's interests in transferred financial assets, impact of 1 percent adverse change in discount rate	(148)		(147)
Sensitivity analysis of fair value, transferor's interests in transferred financial assets, impact of 2 percent adverse change in discount rate	$ (287)		$ (286)

BORROWINGS - Summary of Short-T

BORROWINGS - Summary of Short-Term Borrowings (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Debt Disclosure [Abstract]
Securities sold under repurchase agreements	$ 280,492	$ 256,017
Federal Home Loan Bank advances	1,555,000	2,285,000
Federal funds purchased	1,830,000	1,000,000
Subordinated notes	136,988	137,320
Total short-term borrowings	$ 3,802,480	$ 3,678,337

BORROWINGS - Summary of Long-Te

BORROWINGS - Summary of Long-Term Borrowings (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Debt Disclosure [Abstract]
Federal Home Loan Bank advances	$ 300,053	$ 310,061
Subordinated notes	89,523	87,614
Junior subordinated debt	110,466	110,347
Other subordinated debt	159,848	160,151
Total long-term borrowings	$ 659,890	$ 668,173

BORROWINGS - Additional Informa

BORROWINGS - Additional Information (Detail) - FHLB [Member] - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Credit available with FHLB	$ 7,820,000,000
Credit with FHLB utilized	$ 1,900,000,000
Federal Home Loan Bank advances are scheduled to mature periodically through the year	2,021
Minimum [Member]
Debt Instrument [Line Items]
Effective interest rates	1.39%	0.95%
Maximum [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, 2018	Dec. 31, 2017
Subordinated Borrowing [Line Items]
Junior subordinated debt	$ 110,466	$ 110,347
Trust Preferred Securities [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	115,500
Common Securities [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
Interest Rate	3.77%
F.N.B. Statutory Trust II [Member] | LIBOR [Member]
Subordinated Borrowing [Line Items]
Basis spread on variable rate	1.65%
F.N.B. Statutory Trust II [Member] | Trust Preferred Securities [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	$ 21,500
F.N.B. Statutory Trust II [Member] | Common Securities [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	665
Omega Financial Capital Trust I [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	$ 26,483
Interest Rate	3.92%
Omega Financial Capital Trust I [Member] | LIBOR [Member]
Subordinated Borrowing [Line Items]
Basis spread on variable rate	2.19%
Omega Financial Capital Trust I [Member] | Trust Preferred Securities [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	$ 26,000
Omega Financial Capital Trust I [Member] | Common Securities [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	1,114
Yadkin Valley Statutory Trust I [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	$ 20,925
Interest Rate	3.44%
Yadkin Valley Statutory Trust I [Member] | LIBOR [Member]
Subordinated Borrowing [Line Items]
Basis spread on variable rate	1.32%
Yadkin Valley Statutory Trust I [Member] | Trust Preferred Securities [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	$ 25,000
Yadkin Valley Statutory Trust I [Member] | Common Securities [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	774
FNB Financial Services Capital Trust I [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	$ 21,859
Interest Rate	3.79%
FNB Financial Services Capital Trust I [Member] | LIBOR [Member]
Subordinated Borrowing [Line Items]
Basis spread on variable rate	1.46%
FNB Financial Services Capital Trust I [Member] | Trust Preferred Securities [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	$ 25,000
FNB Financial Services Capital Trust I [Member] | Common Securities [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	774
American Community Capital Trust II [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	$ 10,446
Interest Rate	5.11%
American Community Capital Trust II [Member] | LIBOR [Member]
Subordinated Borrowing [Line Items]
Basis spread on variable rate	2.80%
American Community Capital Trust II [Member] | Trust Preferred Securities [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	$ 10,000
American Community Capital Trust II [Member] | Common Securities [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	310
Crescent Financial Capital Trust I [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	$ 8,588
Interest Rate	4.82%
Crescent Financial Capital Trust I [Member] | LIBOR [Member]
Subordinated Borrowing [Line Items]
Basis spread on variable rate	3.10%
Crescent Financial Capital Trust I [Member] | Trust Preferred Securities [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	$ 8,000
Crescent Financial Capital Trust I [Member] | Common Securities [Member]
Subordinated Borrowing [Line Items]
Junior subordinated debt	$ 248

DERIVATIVE INSTRUMENTS AND HE80

DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Notional Amounts and Gross Fair Values (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Notional amount	$ 5,931,943	$ 5,628,119
Derivative asset, not offset against collateral	3,507	1,448
Derivative liability, not offset against collateral	12,779	13,581
Derivative asset, not subject to master netting arrangement	16,785	29,099
Derivative liability, not subject to master netting arrangement	39,113	15,616
Fair value, asset	20,292	30,547
Fair value, liability	51,892	29,197
Interest rate contracts - designated [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, not offset against collateral	0	228
Derivative liability, not offset against collateral	3,662	1,982
Interest rate swaps - not designated [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, not offset against collateral	3,481	1,169
Derivative liability, not offset against collateral	9,117	11,599
Derivative asset, not subject to master netting arrangement	15,176	27,233
Derivative liability, not subject to master netting arrangement	38,787	15,303
Equity contracts - not designated [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, not offset against collateral	26	51
Derivative liability, not offset against collateral	0	0
Derivative asset, not subject to master netting arrangement	0	0
Derivative liability, not subject to master netting arrangement	26	51
Interest rate lock commitments – not designated [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, not subject to master netting arrangement	1,380	1,594
Derivative liability, not subject to master netting arrangement	5	5
Forward delivery commitments – not designated [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, not subject to master netting arrangement	209	233
Derivative liability, not subject to master netting arrangement	231	148
Credit risk contracts - not designated [Member]
Derivatives, Fair Value [Line Items]
Notional amount	128,700
Derivative asset, not subject to master netting arrangement	20	39
Derivative liability, not subject to master netting arrangement	64	109
Subject to Master Netting Arrangements [Member]
Derivatives, Fair Value [Line Items]
Notional amount	3,128,416	2,951,622
Subject to Master Netting Arrangements [Member] | Interest rate contracts - designated [Member]
Derivatives, Fair Value [Line Items]
Notional amount	705,000	705,000
Subject to Master Netting Arrangements [Member] | Interest rate swaps - not designated [Member]
Derivatives, Fair Value [Line Items]
Notional amount	2,422,236	2,245,442
Subject to Master Netting Arrangements [Member] | Equity contracts - not designated [Member]
Derivatives, Fair Value [Line Items]
Notional amount	1,180	1,180
Not Subject to Master Netting Arrangements [Member]
Derivatives, Fair Value [Line Items]
Notional amount	2,803,527	2,676,497
Not Subject to Master Netting Arrangements [Member] | Interest rate swaps - not designated [Member]
Derivatives, Fair Value [Line Items]
Notional amount	2,422,236	2,245,442
Not Subject to Master Netting Arrangements [Member] | Equity contracts - not designated [Member]
Derivatives, Fair Value [Line Items]
Notional amount	1,180	1,180
Not Subject to Master Netting Arrangements [Member] | Interest rate lock commitments – not designated [Member]
Derivatives, Fair Value [Line Items]
Notional amount	78,368	88,107
Not Subject to Master Netting Arrangements [Member] | Forward delivery commitments – not designated [Member]
Derivatives, Fair Value [Line Items]
Notional amount	94,996	106,572
Not Subject to Master Netting Arrangements [Member] | Credit risk contracts - not designated [Member]
Derivatives, Fair Value [Line Items]
Notional amount	$ 206,747	$ 235,196

DERIVATIVE INSTRUMENTS AND HE81

DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Key Data Related to Interest Rate (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	$ 5,931,943	$ 5,628,119
Fair value included in other assets	20,292	30,547
Fair value included in other liabilities	51,892	29,197
Designated as Hedging Instrument [Member] | Interest rate contracts - designated [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	705,000	705,000
Fair value included in other assets	0	228
Designated as Hedging Instrument [Member] | Trading Liabilities [Member] | Interest rate contracts - designated [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Fair value included in other liabilities	3,662	1,982
Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	4,844,472	4,490,884
Fair value included in other assets	18,657	28,402
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	$ 47,904	$ 26,902

DERIVATIVE INSTRUMENTS AND HE82

DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Amounts Reclassified from AOCI (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Reclassified from AOCI to interest expense	$ 46,822	$ 21,941
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	93
Reclassified from AOCI to interest expense	(129)
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	73
Reclassified from AOCI to interest expense	$ (102)

DERIVATIVE INSTRUMENTS AND HE83

DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Derivative [Line Items]
Notional amount	$ 5,931,943,000		$ 5,628,119,000
Additional amount in excess of posted collateral required in case of breached agreements	$ 600,000		900,000
Interest rate contracts [Member]
Derivative [Line Items]
Maximum length of time hedged in interest rate cash flow hedge	5 years
Period to reclassification of cash flow hedge gain loss	12 months
Derivative gains to be reclassified within twelve months	$ 3,200,000
Derivative gains to be reclassified within twelve months, net of tax	2,500,000
Derivative gain or loses excluded from assessment of hedge effectiveness	0
Hedge ineffectiveness	0	$ 0
Gains or losses from cash flow hedge derivatives reclassified to earnings	$ 0	$ 0
Interest Rate Lock Commitments [Member] | Minimum [Member]
Derivative [Line Items]
Lock in period for interest rates	30 days
Interest Rate Lock Commitments [Member] | Maximum [Member]
Derivative [Line Items]
Lock in period for interest rates	270 days
Credit risk contracts - not designated [Member]
Derivative [Line Items]
Notional amount	$ 128,700,000
Maximum exposure under credit risk agreement assuming customer default	60,000		100,000
Credit risk derivatives, purchased at fair value	20,000		40,000
Credit risk derivatives, sold at fair value	$ 60,000		$ 100,000
Credit risk contracts - not designated [Member] | Minimum [Member]
Derivative [Line Items]
Risk participation agreements, term	3 months
Credit risk contracts - not designated [Member] | Maximum [Member]
Derivative [Line Items]
Risk participation agreements, term	9 years

DERIVATIVE INSTRUMENTS AND HE84

DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Derivative Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Net Amount Presented in the Balance Sheet	$ 3,507	$ 1,448
Financial Instruments	3,477	1,448
Cash Collateral	0	0
Net Amount	30	0
Interest rate contracts - designated [Member]
Derivative [Line Items]
Net Amount Presented in the Balance Sheet	0	228
Financial Instruments	0	228
Cash Collateral	0	0
Net Amount	0	0
Interest rate swaps - not designated [Member]
Derivative [Line Items]
Net Amount Presented in the Balance Sheet	3,481	1,169
Financial Instruments	3,451	1,169
Cash Collateral	0	0
Net Amount	30	0
Equity contracts - not designated [Member]
Derivative [Line Items]
Net Amount Presented in the Balance Sheet	26	51
Financial Instruments	26	51
Cash Collateral	0	0
Net Amount	$ 0	$ 0

DERIVATIVE INSTRUMENTS AND HE85

DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Derivative Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Net Amount Presented in the Balance Sheet	$ 12,779	$ 13,581
Financial Instruments	12,254	12,922
Cash Collateral	0	0
Net Amount	525	659
Interest rate contracts - designated [Member]
Derivative [Line Items]
Net Amount Presented in the Balance Sheet	3,662	1,982
Financial Instruments	3,662	1,982
Cash Collateral	0	0
Net Amount	0	0
Interest rate swaps - not designated [Member]
Derivative [Line Items]
Net Amount Presented in the Balance Sheet	9,117	11,599
Financial Instruments	8,592	10,940
Cash Collateral	0	0
Net Amount	525	659
Equity contracts - not designated [Member]
Derivative [Line Items]
Net Amount Presented in the Balance Sheet	$ 0	$ 0

DERIVATIVE INSTRUMENTS AND HE86

DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Effect of Derivative Financial Instruments on Income Statement (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Interest Rate Contracts [Member] | Interest Income - Loans and Leases [Member]
Derivative [Line Items]
Derivative financial instrument, net	$ 93	$ 506
Interest Rate Contracts [Member] | Interest Expense - Short-term Borrowings [Member]
Derivative [Line Items]
Derivative financial instrument, net	(129)	148
Interest Rate Swap [Member] | Other Income [Member]
Derivative [Line Items]
Derivative financial instrument, net	(160)	(219)
Credit risk contracts - not designated [Member] | Other Income [Member]
Derivative [Line Items]
Derivative financial instrument, net	$ 27	$ 19

COMMITMENTS, CREDIT RISK AND 87

COMMITMENTS, CREDIT RISK AND CONTINGENCIES - Off-Balance Sheet Credit Risk (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Standby Letters of Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Extended credit and standby letters of credit	$ 136,661	$ 132,904
Commitments to Extend Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Extended credit and standby letters of credit	$ 7,097,958	$ 6,957,822

COMMITMENTS, CREDIT RISK AND 88

COMMITMENTS, CREDIT RISK AND CONTINGENCIES - Additional Information (Detail)	Mar. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Percentage of Commitments to extend credit dependent upon the financial condition of the customers	76.40%

STOCK INCENTIVE PLANS - Additio

STOCK INCENTIVE PLANS - Additional Information (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares available under incentive compensation plans (in shares) | shares	2,636,450
Unrecognized compensation expense	$ 9,752
Intrinsic value of outstanding and exercisable stock options	3,000
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense	9,800
Amount subject to accelerated vesting under Incentive Compensation Plan	$ 600
Service-Based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of awards issued, years	3 years
Unrecognized compensation expense	$ 5,691
Performance-Based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of awards issued, years	3 years
Unrecognized compensation expense	$ 4,061
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%
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%
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 - Restric

STOCK INCENTIVE PLANS - Restricted Stock Awards Activity (Detail) - $ / shares	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Shares, unvested awards outstanding at end of period	1,964,711
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Shares, unvested awards outstanding at beginning of period	1,975,862	1,836,363
Shares, vested	(7,631)	(243,982)
Shares, forfeited/expired	(19,893)	(2,950)
Shares, dividend reinvestment	16,373	12,253
Shares, unvested awards outstanding at end of period	1,964,711	1,601,684
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted average grant price, invested awards outstanding at beginning of period (in USD per share)	$ 13.64	$ 12.97
Weighted average grant price, vested (in USD per share)	12.83	11.83
Weighted average grant price, forfeited/expired (in USD per share)	14.02	13
Weighted average grant price, dividend reinvestment (in USD per share)	14.37	14.54
Weighted average grant price, invested awards outstanding at end of period (in USD per share)	$ 13.65	$ 13.16

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, 2018	Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 1,939	$ 1,760
Tax benefit related to stock-based compensation expense	407	616
Fair value of awards vested	$ 110	$ 3,802

STOCK INCENTIVE PLANS - Compone

STOCK INCENTIVE PLANS - Components of Restricted Stock Awards (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested restricted stock awards (in shares) | shares	1,964,711
Unrecognized compensation expense	$ 9,752
Intrinsic value	$ 26,425
Weighted average remaining life (in years)	1 year 7 months 19 days
Service-Based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested restricted stock awards (in shares) | shares	1,050,062
Unrecognized compensation expense	$ 5,691
Intrinsic value	$ 14,123
Weighted average remaining life (in years)	1 year 9 months 2 days
Performance-Based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested restricted stock awards (in shares) | shares	914,649
Unrecognized compensation expense	$ 4,061
Intrinsic value	$ 12,302
Weighted average remaining life (in years)	1 year 5 months 30 days

STOCK INCENTIVE PLANS - Stock O

STOCK INCENTIVE PLANS - Stock Options Awards Activity (Detail) - $ / shares	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]
Shares, options outstanding at beginning of period	722,650	892,532
Shares, assumed from acquisitions	0	207,645
Shares, exercised	(163,035)	(131,792)
Shares, forfeited/expired	(237)	(49,281)
Shares, options outstanding and exercisable at end of period	559,378	919,104
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted average exercise price, options outstanding at beginning of period (in USD per share)	$ 7.96	$ 8.95
Weighted average exercise price, assumed from acquisitions (in USD per share)	0	8.92
Weighted average exercise price, exercised (in USD per share)	7.79	9.44
Weighted average exercise price, forfeited/expired (in USD per share)	10.72	10.91
Weighted average exercise price, options outstanding and exercisable at end of period (in USD per share)	$ 8.03	$ 8.77

RETIREMENT PLANS - Additional I

RETIREMENT PLANS - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2018RetirementPlans
Retirement Benefits [Abstract]
Percent of employer match	100.00%
Employee contribution percentage	6.00%
Additional discretionary contribution, annual financial goals, percentage	3.00%
Number of supplemental non qualified retirement plans	2

RETIREMENT PLANS - Contribution

RETIREMENT PLANS - Contribution Expense (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Retirement Benefits [Abstract]
401(k) contribution expense	$ 3,610	$ 2,767

RETIREMENT PLANS - Net Periodic

RETIREMENT PLANS - Net Periodic Benefit Credit (Detail) - Defined Benefit Plans [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ (4)	$ (4)
Interest cost	1,560	1,477
Expected return on plan assets	(2,895)	(2,427)
Amortization:
Unrecognized prior service cost	0	2
Unrecognized loss	623	628
Net periodic pension credit	$ (716)	$ (324)

INCOME TAXES - Income Tax Expen

INCOME TAXES - Income Tax Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Tax Disclosure [Abstract]
Current, federal taxes	$ 17,700	$ 6,688
Current, state taxes	1,704	499
Total current income taxes	19,404	7,187
Deferred, federal taxes	1,902	1,690
Deferred, state taxes	(38)	(2,393)
Total deferred income taxes	1,864	(703)
Income taxes	$ 21,268	$ 6,484
Statutory tax rate	21.00%	35.00%
Effective tax rate	19.70%	22.00%

INCOME TAXES (Details)

INCOME TAXES (Details)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Tax Disclosure [Abstract]
Effective tax rate	19.70%	22.00%

OTHER COMPREHENSIVE INCOME (Det

OTHER COMPREHENSIVE INCOME (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	$ 4,409,194
Balance at end of period	4,433,453
Unrealized Net Losses on Debt Securities Available for Sale [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(29,626)
Other comprehensive (loss) income before reclassifications	(29,787)
Amounts reclassified from AOCI	0
Net current period other comprehensive (loss) income	(29,787)
Balance at end of period	(59,413)
Unrealized Net Gains (Losses) on Derivative Instruments [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	5,407
Other comprehensive (loss) income before reclassifications	3,804
Amounts reclassified from AOCI	(173)
Net current period other comprehensive (loss) income	3,631
Balance at end of period	9,038
Unrecognized Pension and Postretirement Obligations [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(58,833)
Other comprehensive (loss) income before reclassifications	484
Amounts reclassified from AOCI	0
Net current period other comprehensive (loss) income	484
Balance at end of period	(58,349)
Accumulated Other Comprehensive Income (Loss) [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(83,052)
Other comprehensive (loss) income before reclassifications	(25,499)
Amounts reclassified from AOCI	(173)
Net current period other comprehensive (loss) income	(25,672)
Balance at end of period	$ (108,724)

EARNINGS PER COMMON SHARE - Com

EARNINGS PER COMMON SHARE - Computation of Earnings Per Common Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share [Abstract]
Net income	$ 86,762	$ 22,979
Less: Preferred stock dividends	2,010	2,010
Net Income Available to Common Stockholders	$ 84,752	$ 20,969
Basic weighted average common shares outstanding	323,740,956	237,379,260
Net effect of dilutive stock options, warrants and restricted stock	2,026,012	1,882,423
Diluted weighted average common shares outstanding	325,766,968	239,261,683
Basic (in USD per share)	$ 0.26	$ 0.09
Diluted (in USD per share)	$ 0.26	$ 0.09

EARNINGS PER COMMON SHARE - Ave

EARNINGS PER COMMON SHARE - Average Shares Excluded from Earnings Per Common Share (Detail) - shares	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share [Abstract]
Average shares excluded from the diluted earnings per common share calculation	21	81,755

CASH FLOW INFORMATION (Detail)

CASH FLOW INFORMATION (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Supplemental Cash Flow Elements [Abstract]
Interest paid on deposits and other borrowings	$ 46,540	$ 18,606
Transfers of loans to other real estate owned	$ 3,954	$ 20,517

BUSINESS SEGMENTS - Additional

BUSINESS SEGMENTS - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2018Segment
Segment Reporting [Abstract]
Number of reportable segments	4

BUSINESS SEGMENTS - Financial I

BUSINESS SEGMENTS - Financial Information for Segments (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Segment Reporting Information [Line Items]
Interest income	$ 272,927	$ 194,693
Interest expense	46,822	21,941
Net Interest Income	226,105	172,752
Provision for credit losses	14,495	10,850
Non-interest income	67,503	55,116
Non-interest expense	166,865	184,457
Amortization of intangibles	4,218	3,098
Income tax expense (benefit)	21,268	6,484
Net income (loss)	86,762	22,979
Total assets	31,652,353	30,190,695	$ 31,417,635
Total intangibles	2,339,139	2,356,799
Operating Segments [Member] | Community Banking [Member]
Segment Reporting Information [Line Items]
Interest income	263,587	185,381
Interest expense	42,360	18,865
Net Interest Income	221,227	166,516
Provision for credit losses	12,412	9,064
Non-interest income	53,312	40,716
Non-interest expense	148,667	168,283
Amortization of intangibles	4,105	2,982
Income tax expense (benefit)	21,720	6,311
Net income (loss)	87,635	20,592
Total assets	31,424,150	29,978,061
Total intangibles	2,315,127	2,332,352
Operating Segments [Member] | Wealth Management [Member]
Segment Reporting Information [Line Items]
Interest income	0	0
Interest expense	0	0
Net Interest Income	0	0
Provision for credit losses	0	0
Non-interest income	11,002	9,549
Non-interest expense	8,278	7,540
Amortization of intangibles	61	61
Income tax expense (benefit)	589	711
Net income (loss)	2,074	1,237
Total assets	25,129	22,130
Total intangibles	10,128	10,353
Operating Segments [Member] | Insurance [Member]
Segment Reporting Information [Line Items]
Interest income	20	20
Interest expense	0	0
Net Interest Income	20	20
Provision for credit losses	0	0
Non-interest income	4,303	4,325
Non-interest expense	3,711	3,315
Amortization of intangibles	52	55
Income tax expense (benefit)	124	347
Net income (loss)	436	628
Total assets	20,529	20,514
Total intangibles	12,075	12,285
Operating Segments [Member] | Consumer Finance [Member]
Segment Reporting Information [Line Items]
Interest income	9,294	9,902
Interest expense	910	922
Net Interest Income	8,384	8,980
Provision for credit losses	2,083	1,786
Non-interest income	638	710
Non-interest expense	5,230	5,231
Amortization of intangibles	0	0
Income tax expense (benefit)	474	1,067
Net income (loss)	1,235	1,606
Total assets	169,737	184,006
Total intangibles	1,809	1,809
Parent and Other [Member]
Segment Reporting Information [Line Items]
Interest income	26	(610)
Interest expense	3,552	2,154
Net Interest Income	(3,526)	(2,764)
Provision for credit losses	0	0
Non-interest income	(1,752)	(184)
Non-interest expense	979	88
Amortization of intangibles	0	0
Income tax expense (benefit)	(1,639)	(1,952)
Net income (loss)	(4,618)	(1,084)
Total assets	12,808	(14,016)
Total intangibles	$ 0	$ 0

FAIR VALUE MEASUREMENTS - Asset

FAIR VALUE MEASUREMENTS - Assets and Liabilities on Recurring Basis (Detail) - USD ($) $ in Thousands		Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value, securities available for sale		$ 2,927,463	$ 2,764,562
Loans held for sale	[1]	21,610	56,458
Derivative assets		20,292	30,547
Derivative liabilities		51,892	29,197
U.S. Government-Sponsored Entities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value, securities available for sale		358,648	343,942
Agency Collateralized Mortgage Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value, securities available for sale		832,350	794,957
Non-Agency Collateralized Mortgage Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value, securities available for sale		1	1
Commercial Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value, securities available for sale		39,213
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, securities available for sale		21,023	21,093
Other Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value, securities available for sale		4,655	4,670
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		0	161
Derivative assets		0	0
Derivative liabilities		0	0
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		2,927,463	2,764,401
Derivative assets		18,912	28,953
Derivative liabilities		51,887	29,192
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		0	0
Derivative assets		1,380	1,594
Derivative liabilities		5	5
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value		2,927,463	2,763,537
Assets measured at fair value, equity securities available for sale		1,121	1,025
Assets measured at fair value, securities available for sale			2,764,562
Loans held for sale		21,610	56,458
Derivative assets		20,292	30,547
Assets measured at fair value on a recurring basis, Total		2,970,486	2,851,567
Derivative liabilities		51,892	29,197
Liabilities measured at fair value on a recurring basis, Total		51,892	29,197
Fair Value, Measurements, Recurring [Member] | Trading Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities		47,930	26,953
Fair Value, Measurements, Recurring [Member] | Not for Trading Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities		3,962	2,244
Fair Value, Measurements, Recurring [Member] | Trading Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		18,683	28,453
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		1,609	2,094
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		177	161
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		944	864
Fair Value, Measurements, Recurring [Member] | U.S. Government-Sponsored Entities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value		358,648	343,942
Fair Value, Measurements, Recurring [Member] | Agency Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value		1,671,573	1,598,874
Fair Value, Measurements, Recurring [Member] | Agency Collateralized Mortgage Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value		832,350	794,957
Fair Value, Measurements, Recurring [Member] | Non-Agency Collateralized Mortgage Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value		1	1
Fair Value, Measurements, Recurring [Member] | Commercial Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value		39,213
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]
Fair value		21,023	21,093
Fair Value, Measurements, Recurring [Member] | Other Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value		4,655	4,670
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value		0	0
Assets measured at fair value, equity securities available for sale		177	161
Assets measured at fair value, securities available for sale			161
Loans held for sale		0	0
Derivative assets		0	0
Assets measured at fair value on a recurring basis, Total		177	161
Derivative liabilities		0	0
Liabilities measured at fair value on a recurring basis, Total		0	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Trading Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities		0	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Not for Trading Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities		0	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Trading Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		0	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Not for Trading Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		0	0
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		177	161
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Financial Services Industry [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value, equity securities available for sale		0	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | U.S. Government-Sponsored Entities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value		0	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Agency Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value		0	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Agency Collateralized Mortgage Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value		0	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Non-Agency Collateralized Mortgage Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value		0	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Commercial Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value		0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | States of the U.S. and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value		0	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Other Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value		0	0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value		2,927,463	2,763,537
Assets measured at fair value, equity securities available for sale		944	864
Assets measured at fair value, securities available for sale			2,764,401
Loans held for sale		21,610	56,458
Derivative assets		18,912	28,953
Assets measured at fair value on a recurring basis, Total		2,968,929	2,849,812
Derivative liabilities		51,887	29,192
Liabilities measured at fair value on a recurring basis, Total		51,887	29,192
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Trading Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities		47,930	26,953
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Not for Trading Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities		3,957	2,239
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		18,683	28,453
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		229	500
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		0	0
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		944	864
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]
Fair value		358,648	343,942
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]
Fair value		1,671,573	1,598,874
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]
Fair value		832,350	794,957
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]
Fair value		1	1
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]
Fair value		39,213
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]
Fair value		21,023	21,093
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]
Fair value		4,655	4,670
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value		0	0
Assets measured at fair value, equity securities available for sale		0	0
Assets measured at fair value, securities available for sale			0
Loans held for sale		0	0
Derivative assets		1,380	1,594
Assets measured at fair value on a recurring basis, Total		1,380	1,594
Derivative liabilities		5	5
Liabilities measured at fair value on a recurring basis, Total		5	5
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Trading Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities		0	0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Not for Trading Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities		5	5
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Trading Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets		0	0
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		1,380	1,594
Fair Value, Measurements, Recurring [Member] | Level 3 [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		0	0
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		0	0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | U.S. Government-Sponsored Entities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value		0	0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Agency Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value		0	0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Agency Collateralized Mortgage Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value		0	0
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]
Fair value		0	0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Commercial Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value		0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | States of the U.S. and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value		0	0
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]
Fair value		$ 0	$ 0
[1]	Amount represents loans for which we have elected the fair value option. See Note 18.

FAIR VALUE MEASUREMENTS - Rollf

FAIR VALUE MEASUREMENTS - Rollforward on Recurring Basis (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	$ 1,594	$ 1,386
Total gains (losses) – realized/unrealized:
Included in earnings		4
Included in other comprehensive income		80
Accretion included in earnings		0
Purchases, issuances, sales and settlements:
Purchases	1,380	13,642
Sales/redemptions		(12,921)
Settlements	(1,594)	(4,588)
Transfers from Level 3		(578)
Transfers into Level 3		4,569
Balance at end of period	1,380	1,594
Other Debt Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	0	0
Total gains (losses) – realized/unrealized:
Included in earnings		0
Included in other comprehensive income		0
Accretion included in earnings		(1)
Purchases, issuances, sales and settlements:
Purchases	0	12,048
Sales/redemptions		(12,047)
Settlements	0	0
Transfers from Level 3		0
Transfers into Level 3		0
Balance at end of period	0	0
Equity Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	0	492
Total gains (losses) – realized/unrealized:
Included in earnings		0
Included in other comprehensive income		86
Accretion included in earnings		0
Purchases, issuances, sales and settlements:
Purchases	0	0
Sales/redemptions		0
Settlements	0	0
Transfers from Level 3		(578)
Transfers into Level 3		0
Balance at end of period	0	0
Residential Non-Agency Collateralized Mortgage Obligations [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	0	894
Total gains (losses) – realized/unrealized:
Included in earnings		4
Included in other comprehensive income		(6)
Accretion included in earnings		1
Purchases, issuances, sales and settlements:
Purchases	0	0
Sales/redemptions		(874)
Settlements	0	(19)
Transfers from Level 3		0
Transfers into Level 3		0
Balance at end of period	0	0
Interest Rate Lock Commitments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	1,594	0
Total gains (losses) – realized/unrealized:
Included in earnings		0
Included in other comprehensive income		0
Accretion included in earnings		0
Purchases, issuances, sales and settlements:
Purchases	1,380	1,594
Sales/redemptions		0
Settlements	(1,594)	(4,569)
Transfers from Level 3		0
Transfers into Level 3		4,569
Balance at end of period	$ 1,380	$ 1,594

FAIR VALUE MEASUREMENTS - Addit

FAIR VALUE MEASUREMENTS - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Fair Value Measurements Disclosure [Line Items]
Retained earnings	$ 413,340,000		$ 367,658,000
Allocated allowance for loan losses	3,200,000
Provision for fair value measurements included in allowance for loan losses	2,700,000
Carrying amount of OREO	2,000,000
Written down of OREO	1,600,000
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	$ 3,500,000
Allocated allowance for loan losses	3,507,000		$ 4,110,000
Assets Still Held [Member]
Fair Value Measurements Disclosure [Line Items]
Included in earnings		$ 0
Other Debt Securities [Member] | Yadkin Financial Corporation (YDKN) [Member]
Fair Value Measurements Disclosure [Line Items]
Business acquisition		12,000,000
Equity Securities [Member]
Fair Value Measurements Disclosure [Line Items]
Transfer of equity security to non-marketable equity securities, included in other assets	0
Fair value, net derivative asset (liability) measured on recurring basis, unobservable inputs reconciliation, transfers, net		$ 600,000
Accounting Standards Update 2016-01 [Member]
Fair Value Measurements Disclosure [Line Items]
Retained earnings	$ 500,000

FAIR VALUE MEASUREMENTS - Ad108

FAIR VALUE MEASUREMENTS - Additional Information on Non-Recurring Basis (Detail) - USD ($) $ in Thousands		Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans		$ 3,200
Loans held for sale	[1]	21,610	$ 56,458
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loan servicing rights, fair value		0	0
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loan servicing rights, fair value		0	0
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loan servicing rights, fair value		41,878	37,758
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans		3,507	4,110
Other real estate owned		1,621	21,336
Fair Value, Measurements, Nonrecurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans		0	0
Other real estate owned		0	0
Fair Value, Measurements, Nonrecurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans		2,032	2,813
Other real estate owned		0	10,513
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans		1,475	1,297
Other real estate owned		1,621	10,823
SBA-Guaranteed Loan Servicing [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loan servicing rights, fair value		5,062	5,058	$ 5,339	$ 0
SBA-Guaranteed Loan Servicing [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale			36,432
Loan servicing rights, fair value		5,062	5,058
SBA-Guaranteed Loan Servicing [Member] | Fair Value, Measurements, Nonrecurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale			0
Loan servicing rights, fair value		0	0
SBA-Guaranteed Loan Servicing [Member] | Fair Value, Measurements, Nonrecurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale			0
Loan servicing rights, fair value		0	0
SBA-Guaranteed Loan Servicing [Member] | Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale			36,432
Loan servicing rights, fair value		$ 5,062	$ 5,058
[1]	Amount represents loans for which we have elected the fair value option. See Note 18.

FAIR VALUE MEASUREMENTS - Finan

FAIR VALUE MEASUREMENTS - Financial Instruments (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 386,329	$ 479,443	$ 450,383	$ 371,407
Securities available for sale	2,927,463	2,764,562
Securities held to maturity	3,224,000	3,242,268
Securities held to maturity, fair value	3,131,964	3,218,379
Derivative assets	20,292	30,547
Deposits	22,497,089	22,399,725
Short-term borrowings	3,802,480	3,678,337
Long-term borrowings	659,890	668,173
Derivative liabilities	51,892	29,197
Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	386,329	479,443
Securities available for sale	2,927,463	2,764,562
Securities held to maturity	3,224,000	3,242,268
Net loans and leases	21,121,132	20,916,277
Loan servicing rights	35,853	34,111
Marketable securities, equity securities	1,121
Derivative assets	20,292	30,547
Accrued interest receivable	95,082	94,254
Deposits	22,497,089	22,399,725
Short-term borrowings	3,802,480	3,678,337
Long-term borrowings	659,890	668,173
Derivative liabilities	51,892	29,197
Accrued interest payable	12,762	12,480
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents, fair value	386,329	479,443
Securities available for sale	2,927,463	2,764,562
Securities held to maturity, fair value	3,131,964	3,218,379
Net loans and leases, fair value	20,900,639	20,661,196
Loan servicing rights, fair value	41,878	37,758
Marketable securities, equity securities, fair value	1,121
Derivative assets	20,292	30,547
Accrued interest receivable	95,082	94,254
Deposits, fair value	22,441,017	22,359,182
Short-term borrowings, fair value	3,802,988	3,678,723
Long-term borrowings, fair value	663,085	675,489
Derivative liabilities	51,892	29,197
Accrued interest payable	12,762	12,480
Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents, fair value	386,329	479,443
Securities available for sale	0	161
Securities held to maturity, fair value	0	0
Net loans and leases, fair value	0	0
Loan servicing rights, fair value	0	0
Marketable securities, equity securities, fair value	177
Derivative assets	0	0
Accrued interest receivable	95,082	94,254
Deposits, fair value	17,755,830	17,779,246
Short-term borrowings, fair value	3,802,988	3,678,723
Long-term borrowings, fair value	0	0
Derivative liabilities	0	0
Accrued interest payable	12,762	12,480
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents, fair value	0	0
Securities available for sale	2,927,463	2,764,401
Securities held to maturity, fair value	3,131,964	3,218,379
Net loans and leases, fair value	21,610	56,458
Loan servicing rights, fair value	0	0
Marketable securities, equity securities, fair value	944
Derivative assets	18,912	28,953
Accrued interest receivable	0	0
Deposits, fair value	4,685,187	4,579,936
Short-term borrowings, fair value	0	0
Long-term borrowings, fair value	0	0
Derivative liabilities	51,887	29,192
Accrued interest payable	0	0
Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents, fair value	0	0
Securities available for sale	0	0
Securities held to maturity, fair value	0	0
Net loans and leases, fair value	20,879,029	20,604,738
Loan servicing rights, fair value	41,878	37,758
Marketable securities, equity securities, fair value	0
Derivative assets	1,380	1,594
Accrued interest receivable	0	0
Deposits, fair value	0	0
Short-term borrowings, fair value	0	0
Long-term borrowings, fair value	663,085	675,489
Derivative liabilities	5	5
Accrued interest payable	$ 0	$ 0