F.N.B. (FNB) 10-Q 7 Aug 18 2018 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2018	Jul. 31, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q2
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		324,258,342

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands		Jun. 30, 2018	Dec. 31, 2017
Assets
Cash and due from banks		$ 398,641	$ 408,718
Interest bearing deposits with banks		35,058	70,725
Cash and Cash Equivalents		433,699	479,443
Securities available for sale		3,002,787	2,764,562
Debt securities held to maturity (fair value of $3,181,275 and $3,218,379)		3,295,081	3,242,268
Loans held for sale (includes $28,213 and $56,458 measured at fair value) (1)	[1]	44,112	92,891
Loans and leases, net of unearned income of $39,202 and $50,680		21,659,582	20,998,766
Allowance for credit losses		(176,574)	(175,380)
Net Loans and Leases		21,483,008	20,823,386
Premises and equipment, net		324,659	336,540
Goodwill		2,251,349	2,249,188
Core deposit and other intangible assets, net		84,096	92,075
Bank owned life insurance		532,135	526,818
Other assets		806,637	810,464
Total Assets		32,257,563	31,417,635
Liabilities
Non-interest-bearing demand		5,926,473	5,720,030
Interest-bearing demand		9,134,954	9,571,038
Savings		2,607,372	2,488,178
Certificates and other time deposits		4,870,988	4,620,479
Total Deposits		22,539,787	22,399,725
Short-term borrowings		4,334,146	3,678,337
Long-term borrowings		628,938	668,173
Other liabilities		281,450	262,206
Total Liabilities		27,784,321	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 - 326,064,004 and 325,095,055 shares		3,262	3,253
Additional paid-in capital		4,043,124	4,033,567
Retained earnings		457,326	367,658
Accumulated other comprehensive loss		(115,885)	(83,052)
Treasury stock – 1,805,662 and 1,629,915 shares at cost		(21,467)	(19,114)
Total Stockholders’ Equity		4,473,242	4,409,194
Total Liabilities and Stockholders’ Equity		$ 32,257,563	$ 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		Jun. 30, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Securities held to maturity, fair value		$ 3,181,275	$ 3,218,379
Loans held for sale, fair value	[1]	28,213	56,458
Unearned income on loans		$ 39,202	$ 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		326,064,004	325,095,055
Treasury stock, shares		1,805,662	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		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Interest Income
Loans and leases, including fees	$ 257,895	$ 221,091	$ 496,989	$ 389,720
Securities:
Taxable	28,995	25,029	55,874	47,495
Tax-exempt	6,960	4,677	13,554	8,078
Dividends	0	76	0	85
Other	267	161	627	349
Total Interest Income	294,117	251,034	567,044	445,727
Interest Expense
Deposits	31,049	16,753	57,518	28,493
Short-term borrowings	18,409	10,959	33,616	17,633
Long-term borrowings	5,304	4,907	10,450	8,434
Total Interest Expense	54,762	32,619	101,584	54,560
Net Interest Income	239,355	218,415	465,460	391,167
Provision for credit losses	15,554	16,756	30,049	27,606
Net Interest Income After Provision for Credit Losses	223,801	201,659	435,411	363,561
Non-Interest Income
Service charges	31,114	32,090	61,191	56,671
Trust services	6,469	5,715	12,917	11,462
Insurance commissions and fees	4,567	4,347	9,702	9,488
Securities commissions and fees	4,526	3,887	8,845	7,510
Capital markets income	5,854	5,004	11,068	8,851
Mortgage banking operations	5,940	5,173	11,469	8,963
Bank owned life insurance	3,077	3,092	6,362	5,245
Net securities gains	31	493	31	3,118
Other	3,311	6,277	10,807	9,886
Total Non-Interest Income	64,889	66,078	132,392	121,194
Non-Interest Expense
Salaries and employee benefits	98,671	84,899	187,997	158,477
Net occupancy	16,149	14,060	31,717	25,409
Equipment	13,183	12,420	27,648	22,050
Amortization of intangibles	3,811	4,813	8,029	7,911
Outside services	17,045	13,483	31,770	26,526
FDIC insurance	9,167	9,376	18,001	14,763
Bank shares and franchise taxes	3,240	2,742	6,692	5,722
Merger-related	0	1,354	0	54,078
Other	21,747	20,567	42,242	36,333
Total Non-Interest Expense	183,013	163,714	354,096	351,269
Income Before Income Taxes	105,677	104,023	213,707	133,486
Income taxes	20,471	29,617	41,739	36,101
Net Income	85,206	74,406	171,968	97,385
Preferred stock dividends	2,010	2,010	4,020	4,020
Net Income Available to Common Stockholders	$ 83,196	$ 72,396	$ 167,948	$ 93,365
Earnings per Common Share
Basic (in USD per share)	$ 0.26	$ 0.22	$ 0.52	$ 0.33
Diluted (in USD per share)	0.26	0.22	0.52	0.33
Cash Dividends per Common Share (in USD per share)	$ 0.12	$ 0.12	$ 0.24	$ 0.24

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 85,206	$ 74,406	$ 171,968	$ 97,385
Securities available for sale:
Unrealized (losses) gains arising during the period, net of tax (benefit) expense of $(2,523), $403, $(10,990) and $3,779	(8,873)	720	(38,660)	6,739
Reclassification adjustment for (gains) losses included in net income, net of tax expense (benefit) of $7, $(427), $7 and $8	(24)	761	(24)	(14)
Derivative instruments:
Unrealized gains (losses) arising during the period, net of tax expense (benefit) of $511, $(766), $1,593 and $(1,341)	1,796	(1,365)	5,600	(2,390)
Reclassification adjustment for gains included in net income, net of tax expense of $156, $(40), $205 and $89	(548)	70	(721)	(159)
Pension and postretirement benefit obligations:
Unrealized (losses) gains arising during the period, net of tax (benefit) expense of $138, $224, $274 and $452	488	400	972	810
Other comprehensive (loss) income	(7,161)	586	(32,833)	4,986
Comprehensive income	$ 78,045	$ 74,992	$ 139,135	$ 102,371

Consolidated Statements of Com6

Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Unrealized gains arising during the period, tax expense	$ (2,523)	$ 403	$ (10,990)	$ 3,779
Reclassification adjustment for gains included in net income, tax expense	7	(427)	7	8
Unrealized (losses) gains arising during the period, tax (benefit) expense	511	(766)	1,593	(1,341)
Reclassification adjustment for gains included in net income, tax expense	156	(40)	205	89
Unrealized gains arising during the period, tax expense	$ 138	$ 224	$ 274	$ 452

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	102,371				97,385	4,986
Dividends declared:
Preferred stock	(4,020)				(4,020)
Common stock: $0.24/share	(64,561)				(64,561)
Issuance of common stock	(256)		9	4,039			(4,304)
Issuance of common stock - acquisitions	1,781,935		1,116	1,780,819
Assumption of warrant due to acquisition	1,394			1,394
Restricted stock compensation	3,958			3,958
Balance at end of period at Jun. 30, 2017	4,392,438	106,882	3,250	4,024,576	333,201	(56,383)	(19,088)
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	139,135				171,968	(32,833)
Dividends declared:
Preferred stock	(4,020)				(4,020)
Common stock: $0.24/share	(78,280)				(78,280)
Issuance of common stock	2,514		9	4,858			(2,353)
Restricted stock compensation	4,699			4,699
Balance at end of period at Jun. 30, 2018	$ 4,473,242	$ 106,882	$ 3,262	$ 4,043,124	$ 457,326	$ (115,885)	$ (21,467)

Consolidated Statements of Sto8

Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Stockholders' Equity [Abstract]
Common stock dividends per share (in USD per share)	$ 0.12	$ 0.12	$ 0.24	$ 0.24

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Operating Activities
Net income	$ 171,968	$ 97,385
Adjustments to reconcile net income to net cash flows provided by operating activities:
Depreciation, amortization and accretion	57,388	36,392
Provision for credit losses	30,049	27,606
Deferred tax expense	15,541	21,226
Net securities gains	(31)	(3,118)
Tax benefit of stock-based compensation	(357)	(724)
Loans originated for sale	(529,376)	(519,973)
Loans sold	589,823	380,522
Gain on sale of loans	(11,668)	(4,716)
Net change in:
Interest receivable	1,044	(462)
Interest payable	2,658	58
Bank owned life insurance	(5,367)	(5,063)
Other, net	27,613	(114,988)
Net cash flows provided by (used in) operating activities	349,285	(85,855)
Investing Activities
Net change in loans and leases	(719,659)	(582,236)
Securities available for sale:
Purchases	(581,769)	(592,601)
Sales	0	755,866
Maturities	288,337	247,930
Debt securities held to maturity:
Purchases	(224,229)	(782,281)
Sales	0	1,574
Maturities	168,333	214,739
Increase in premises and equipment	(10,333)	(34,832)
Net cash received in business combinations	0	196,964
Other, net	(32)	(5,805)
Net cash flows used in investing activities	(1,079,352)	(580,682)
Financing Activities
Demand (non-interest bearing and interest bearing) and savings accounts	(110,447)	(45,049)
Time deposits	252,901	(143,154)
Short-term borrowings	655,809	1,126,769
Proceeds from issuance of long-term borrowings	17,490	77,223
Repayment of long-term borrowings	(56,343)	(133,162)
Net proceeds from issuance of common stock	7,213	3,702
Cash dividends paid:
Preferred stock	(4,020)	(4,020)
Common stock	(78,280)	(64,561)
Net cash flows provided by financing activities	684,323	817,748
Net Increase (Decrease) in Cash and Cash Equivalents	(45,744)	151,211
Cash and cash equivalents at beginning of period	479,443	371,407
Cash and Cash Equivalents at End of Period	$ 433,699	$ 522,618

NATURE OF OPERATIONS

NATURE OF OPERATIONS	6 Months Ended
	Jun. 30, 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 June 30, 2018 , we had 404 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 June 30, 2018 .

SUMMARY OF SIGNIFICANT ACCOUNTI

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	6 Months Ended
	Jun. 30, 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 June 30, 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 June 30, 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 $27.3 million and $20.9 million at June 30, 2018 and December 31, 2017 , respectively. Our unfunded commitments in LIHTCs were $57.0 million and $67.2 million at June 30, 2018 and December 31, 2017 , respectively.

NEW ACCOUNTING STANDARDS

NEW ACCOUNTING STANDARDS	6 Months Ended
	Jun. 30, 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 and regulatory capital. We have created a cross-functional steering committee to govern implementation as we continue to review and enhance our business processes, information systems and controls to support recognition and disclosures under this Update including designing and building the models that will be used to calculate the expected credit losses. The impact of this Update will be dependent on the portfolio composition, credit quality and forecasts of 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) ASU 2018-10, Codification Improvements to Topic 842, Leases ASU 2018-11, Leases (Topic 842), Targeted Improvements These Updates require 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. These Updates are to be applied using a modified retrospective application including a number of optional practical expedients. We are in the process of classifying our existing lease portfolios, implementing a software solution, and assessing the potential impact to our Consolidated Financial Statements. We do not believe this update will materially impact our consolidated net income. 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	6 Months Ended
	Jun. 30, 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. Any adjustments to fair values and related adjustments to goodwill were recorded within the 12-month period.

SECURITIES

SECURITIES	6 Months Ended
	Jun. 30, 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: June 30, 2018 U.S. government agencies $ 96,085 $ — $ (559 ) $ 95,526 U.S. government-sponsored entities 312,903 — (5,969 ) 306,934 Residential mortgage-backed securities: Agency mortgage-backed securities 1,626,353 390 (49,147 ) 1,577,596 Agency collateralized mortgage obligations 863,976 29 (32,188 ) 831,817 Non-agency collateralized mortgage obligations — — — — Commercial mortgage-backed securities 168,466 154 (296 ) 168,324 States of the U.S. and political subdivisions 20,795 2 (62 ) 20,735 Other debt securities 1,949 — (94 ) 1,855 Total debt securities available for sale $ 3,090,527 $ 575 $ (88,315 ) $ 3,002,787 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: June 30, 2018 U.S. Treasury $ 500 $ 107 $ — $ 607 U.S. government agencies 2,056 60 — 2,116 U.S. government-sponsored entities 245,017 — (6,030 ) 238,987 Residential mortgage-backed securities: Agency mortgage-backed securities 1,125,947 295 (33,439 ) 1,092,803 Agency collateralized mortgage obligations 840,073 768 (34,063 ) 806,778 Commercial mortgage-backed securities 79,124 7 (1,555 ) 77,576 States of the U.S. and political subdivisions 1,002,364 1,626 (41,582 ) 962,408 Total debt securities held to maturity $ 3,295,081 $ 2,863 $ (116,669 ) $ 3,181,275 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 Six Months Ended (in thousands) 2018 2017 2018 2017 Gross gains $ 31 $ 611 $ 31 $ 4,011 Gross losses — (118 ) — (893 ) Net gains $ 31 $ 493 $ 31 $ 3,118 As of June 30, 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 $ 65,485 $ 65,271 $ 55,457 $ 55,236 Due from one to five years 262,288 256,488 201,924 196,157 Due from five to ten years 19,860 19,709 95,166 94,334 Due after ten years 84,099 83,582 897,390 858,391 431,732 425,050 1,249,937 1,204,118 Residential mortgage-backed securities: Agency mortgage-backed securities 1,626,353 1,577,596 1,125,947 1,092,803 Agency collateralized mortgage obligations 863,976 831,817 840,073 806,778 Commercial mortgage-backed securities 168,466 168,324 79,124 77,576 Total debt securities $ 3,090,527 $ 3,002,787 $ 3,295,081 $ 3,181,275 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) June 30, December 31, Securities pledged (carrying value): To secure public deposits, trust deposits and for other purposes as required by law $ 3,370,601 $ 3,491,634 As collateral for short-term borrowings 261,140 263,756 Securities pledged as a percent of total securities 57.7 % 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 June 30, 2018 U.S. government agencies 13 $ 95,526 $ (559 ) — $ — $ — 13 $ 95,526 $ (559 ) U.S. government-sponsored entities 5 106,668 (1,236 ) 10 200,266 (4,733 ) 15 306,934 (5,969 ) Residential mortgage-backed securities: Agency mortgage-backed securities 59 1,145,743 (30,600 ) 28 418,672 (18,547 ) 87 1,564,415 (49,147 ) Agency collateralized mortgage obligations 17 491,313 (16,023 ) 33 292,579 (16,165 ) 50 783,892 (32,188 ) Commercial mortgage-backed securities 2 74,167 (296 ) — — — 2 74,167 (296 ) States of the U.S. and political subdivisions 7 11,476 (55 ) 1 877 (7 ) 8 12,353 (62 ) Other debt securities — — — 3 1,855 (94 ) 3 1,855 (94 ) Total temporarily impaired debt securities AFS 103 $ 1,924,893 $ (48,769 ) 75 $ 914,249 $ (39,546 ) 178 $ 2,839,142 $ (88,315 ) 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 June 30, 2018 U.S. government-sponsored entities 4 $ 54,509 $ (508 ) 10 $ 184,478 $ (5,522 ) 14 $ 238,987 $ (6,030 ) Residential mortgage-backed securities: Agency mortgage-backed securities 80 909,762 (25,390 ) 11 164,501 (8,049 ) 91 1,074,263 (33,439 ) Agency collateralized mortgage obligations 17 299,575 (8,104 ) 35 420,914 (25,959 ) 52 720,489 (34,063 ) Commercial mortgage-backed securities 8 54,920 (884 ) 4 21,531 (671 ) 12 76,451 (1,555 ) States of the U.S. and political subdivisions 174 616,117 (24,296 ) 37 110,429 (17,286 ) 211 726,546 (41,582 ) Total temporarily impaired debt securities HTM 283 $ 1,934,883 $ (59,182 ) 97 $ 901,853 $ (57,487 ) 380 $ 2,836,736 $ (116,669 ) 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 six months ended June 30, 2018 or 2017 . States of the U.S. and Political Subdivisions Our municipal bond portfolio with a carrying amount of $1.0 billion as of June 30, 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 $3.1 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	6 Months Ended
	Jun. 30, 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 June 30, 2018 Commercial real estate $ 5,754,367 $ 3,079,955 $ 8,834,322 Commercial and industrial 3,797,773 503,614 4,301,387 Commercial leases 337,397 — 337,397 Other 43,351 — 43,351 Total commercial loans and leases 9,932,888 3,583,569 13,516,457 Direct installment 1,772,090 119,990 1,892,080 Residential mortgages 2,297,558 553,412 2,850,970 Indirect installment 1,746,352 157 1,746,509 Consumer lines of credit 1,136,293 517,273 1,653,566 Total consumer loans 6,952,293 1,190,832 8,143,125 Total loans and leases, net of unearned income $ 16,885,181 $ 4,774,401 $ 21,659,582 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) June 30, December 31, Commercial construction, acquisition and development loans $ 1,176,326 $ 1,170,175 Percent of total loans and leases 5.4 % 5.6 % Commercial real estate: Percent owner-occupied 35.0 % 35.3 % Percent non-owner-occupied 65.0 % 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) June 30, December 31, Accounted for under ASC 310-30: Outstanding balance $ 4,387,378 $ 5,176,015 Carrying amount 4,101,583 4,834,256 Accounted for under ASC 310-20: Outstanding balance 688,541 835,130 Carrying amount 668,859 812,322 Total acquired loans: Outstanding balance 5,075,919 6,011,145 Carrying amount 4,770,442 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 June 30, 2018 and $1.9 million at December 31, 2017 , representing 0.04% and 0.03% , respectively, 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. Six Months Ended (in thousands) 2018 2017 Balance at beginning of period $ 708,481 $ 467,070 Acquisitions — 444,715 Reduction due to unexpected early payoffs (94,456 ) (61,093 ) Reclass from non-accretable difference 128,955 40,304 Disposals/transfers (408 ) (324 ) Other (1,619 ) — Accretion (116,006 ) (100,628 ) Balance at end of period $ 624,947 $ 790,044 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 six months ended June 30, 2018 , there was an overall improvement in cash flow expectations which resulted in a net reclassification of $129.0 million from the non-accretable difference to accretable yield. This reclassification was $40.3 million for the six months ended June 30, 2017 . The reclassification from the non-accretable difference to the accretable yield results in prospective yield adjustments on the loan pools and was also positively impacted by the sale of $56.5 million of acquired residential mortgage loans in the second quarter of 2018. 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) June 30, December 31, Non-accrual loans $ 68,696 $ 74,635 Troubled debt restructurings 24,820 23,481 Total non-performing loans 93,516 98,116 Other real estate owned 39,240 40,606 Total non-performing assets $ 132,756 $ 138,722 Asset quality ratios: Non-performing loans / total loans and leases 0.43 % 0.47 % Non-performing loans + OREO / total loans and leases + OREO 0.61 % 0.66 % Non-performing assets / total assets 0.41 % 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 $6.0 million at June 30, 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 June 30, 2018 and December 31, 2017 totaled $12.5 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 (4) Current Total Loans and Leases Originated Loans and Leases June 30, 2018 Commercial real estate $ 10,476 $ 2 $ 14,652 $ 25,130 $ 5,729,237 $ 5,754,367 Commercial and industrial 5,663 3 23,367 29,033 3,768,740 3,797,773 Commercial leases 861 — 1,218 2,079 335,318 337,397 Other 163 204 1,000 1,367 41,984 43,351 Total commercial loans and leases 17,163 209 40,237 57,609 9,875,279 9,932,888 Direct installment 9,317 4,028 7,402 20,747 1,751,343 1,772,090 Residential mortgages 10,046 1,596 6,882 18,524 2,279,034 2,297,558 Indirect installment 7,592 355 2,152 10,099 1,736,253 1,746,352 Consumer lines of credit 4,187 1,039 3,280 8,506 1,127,787 1,136,293 Total consumer loans 31,142 7,018 19,716 57,876 6,894,417 6,952,293 Total originated loans and leases $ 48,305 $ 7,227 $ 59,953 $ 115,485 $ 16,769,696 $ 16,885,181 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) (3) Current (Discount) Premium Total Loans Acquired Loans June 30, 2018 Commercial real estate $ 20,622 $ 53,440 $ 3,231 $ 77,293 $ 3,181,557 $ (178,895 ) $ 3,079,955 Commercial and industrial 1,620 3,498 4,347 9,465 526,830 (32,681 ) 503,614 Total commercial loans 22,242 56,938 7,578 86,758 3,708,387 (211,576 ) 3,583,569 Direct installment 3,766 1,131 — 4,897 115,496 (403 ) 119,990 Residential mortgages 10,424 7,697 — 18,121 552,387 (17,096 ) 553,412 Indirect installment — 1 — 1 1 155 157 Consumer lines of credit 7,042 2,122 1,165 10,329 518,027 (11,083 ) 517,273 Total consumer loans 21,232 10,951 1,165 33,348 1,185,911 (28,427 ) 1,190,832 Total acquired loans $ 43,474 $ 67,889 $ 8,743 $ 120,106 $ 4,894,298 $ (240,003 ) $ 4,774,401 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 June 30, 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. (3) Approximately $28.5 million of acquired past-due or non-accrual loans were sold during the second quarter of 2018. (4) Approximately $14.7 million of originated past-due or non-accrual loans were sold during the second quarter of 2018. 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 June 30, 2018 Commercial real estate $ 5,499,238 $ 131,806 $ 123,297 $ 26 $ 5,754,367 Commercial and industrial 3,537,536 176,599 79,246 4,392 3,797,773 Commercial leases 326,574 2,274 8,549 — 337,397 Other 42,037 110 1,204 — 43,351 Total originated commercial loans and leases $ 9,405,385 $ 310,789 $ 212,296 $ 4,418 $ 9,932,888 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 June 30, 2018 Commercial real estate $ 2,661,433 $ 200,723 $ 217,626 $ 173 $ 3,079,955 Commercial and industrial 434,731 26,981 41,902 — 503,614 Total acquired commercial loans $ 3,096,164 $ 227,704 $ 259,528 $ 173 $ 3,583,569 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 June 30, 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 June 30, 2018 Direct installment $ 1,756,297 $ 15,793 $ 1,772,090 Residential mortgages 2,279,790 17,768 2,297,558 Indirect installment 1,744,007 2,345 1,746,352 Consumer lines of credit 1,131,322 4,971 1,136,293 Total originated consumer loans $ 6,911,416 $ 40,877 $ 6,952,293 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 June 30, 2018 Direct installment $ 119,921 $ 69 $ 119,990 Residential mortgages 553,412 — 553,412 Indirect installment 157 — 157 Consumer lines of credit 515,659 1,614 517,273 Total acquired consumer loans $ 1,189,149 $ 1,683 $ 1,190,832 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 Six Months Ended June 30, 2018 Commercial real estate $ 16,428 $ 14,308 $ 201 $ 14,509 $ 26 $ 20,912 Commercial and industrial 28,738 13,020 10,787 23,807 4,392 23,688 Commercial leases 1,218 1,218 — 1,218 — 1,309 Other — — — — — — Total commercial loans and leases 46,384 28,546 10,988 39,534 4,418 45,909 Direct installment 18,603 15,793 — 15,793 — 15,693 Residential mortgages 19,180 17,768 — 17,768 — 16,973 Indirect installment 4,579 2,345 — 2,345 — 2,387 Consumer lines of credit 6,735 4,971 — 4,971 — 4,741 Total consumer loans 49,097 40,877 — 40,877 — 39,794 Total $ 95,481 $ 69,423 $ 10,988 $ 80,411 $ 4,418 $ 85,703 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 $3.1 million and $2.6 million for the six months ended June 30, 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) June 30, December 31, Commercial real estate $ 2,892 $ 4,976 Commercial and industrial 78 (415 ) Total commercial loans 2,970 4,561 Direct installment 562 1,553 Residential mortgages 191 484 Indirect installment 250 177 Consumer lines of credit (14 ) (77 ) Total consumer loans 989 2,137 Total allowance on acquired loans $ 3,959 $ 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 June 30, 2018 Accruing: Performing $ 19,352 $ 168 $ 19,520 Non-performing 21,689 3,131 24,820 Non-accrual 9,323 51 9,374 Total TDRs $ 50,364 $ 3,350 $ 53,714 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 six months ended June 30, 2018 , we returned to performing status $2.2 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) June 30, December 31, Specific reserves for commercial TDRs $ 14 $ 95 Pooled reserves for individual commercial loans 529 469 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 $4.2 million for June 30, 2018 and $4.0 million for 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 June 30, 2018 Six Months Ended June 30, 2018 (dollars in thousands) Number of Contracts Pre- Modification Outstanding Recorded Investment Post- Modification Outstanding Recorded Investment Number of Contracts Pre- Modification Outstanding Recorded Investment Post- Modification Outstanding Recorded Investment Commercial real estate 1 $ 125 $ 122 1 $ 125 $ 122 Commercial and industrial 13 862 780 13 2,524 1,384 Total commercial loans 14 987 902 14 2,649 1,506 Direct installment 178 2,372 2,276 357 3,404 3,209 Residential mortgages 8 304 298 19 807 799 Indirect installment 7 11 11 16 24 23 Consumer lines of credit 22 382 298 41 709 513 Total consumer loans 215 3,069 2,883 433 4,944 4,544 Total 229 $ 4,056 $ 3,785 447 $ 7,593 $ 6,050 Three Months Ended June 30, 2017 Six Months Ended June 30, 2017 (dollars in thousands) Number of Contracts Pre- Modification Outstanding Recorded Investment Post- Modification Outstanding Recorded Investment Number of Contracts Pre- Modification Outstanding Recorded Investment Post- Modification Outstanding Recorded Investment Commercial real estate 1 $ 463 $ 463 2 $ 595 $ 566 Commercial and industrial 2 4,038 4,204 2 3,542 4,204 Total commercial loans 3 4,501 4,667 4 4,137 4,770 Direct installment 162 1,448 1,301 333 2,951 2,688 Residential mortgages 9 405 345 16 570 497 Indirect installment 4 15 14 9 31 27 Consumer lines of credit 21 311 208 43 1,054 905 Total consumer loans 196 2,179 1,868 401 4,606 4,117 Total 199 $ 6,680 $ 6,535 405 $ 8,743 $ 8,887 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 Six Months Ended (dollars in thousands) Number of Contracts Recorded Investment Number of Contracts Recorded Investment Direct installment 41 $ 202 78 $ 304 Residential mortgages 3 146 6 293 Indirect installment 5 10 9 15 Consumer lines of credit 2 56 3 252 Total consumer loans 51 414 96 864 Total 51 $ 414 96 $ 864 Three Months Ended Six Months Ended (dollars in thousands) Number of Contracts Recorded Investment Number of Contracts Recorded Investment Commercial and industrial 2 $ 312 3 $ 326 Total commercial loans 2 312 3 326 Direct installment 31 134 55 146 Residential mortgages 1 80 4 264 Indirect installment 6 19 10 19 Consumer lines of credit 1 63 1 63 Total consumer loans 39 296 70 492 Total 41 $ 608 73 $ 818

ALLOWANCE FOR CREDIT LOSSES

ALLOWANCE FOR CREDIT LOSSES	6 Months Ended
	Jun. 30, 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 appropriate level 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 June 30, 2018 Commercial real estate $ 53,516 $ (4,254 ) $ 765 $ (3,489 ) $ 560 $ 50,587 Commercial and industrial 53,013 (6,127 ) 1,157 (4,970 ) 5,646 53,689 Commercial leases 6,115 (36 ) 14 (22 ) 946 7,039 Other 1,995 (1,578 ) 272 (1,306 ) 1,307 1,996 Total commercial loans and leases 114,639 (11,995 ) 2,208 (9,787 ) 8,459 113,311 Direct installment 20,128 (2,922 ) 463 (2,459 ) 2,610 20,279 Residential mortgages 15,280 (314 ) 16 (298 ) 181 15,163 Indirect installment 11,955 (2,218 ) 974 (1,244 ) 2,690 13,401 Consumer lines of credit 10,408 (1,105 ) 62 (1,043 ) 1,096 10,461 Total consumer loans 57,771 (6,559 ) 1,515 (5,044 ) 6,577 59,304 Total allowance on originated loans and leases 172,410 (18,554 ) 3,723 (14,831 ) 15,036 172,615 Purchased credit-impaired loans 622 — — — 2 624 Other acquired loans 6,215 (4,076 ) 680 (3,396 ) 516 3,335 Total allowance on acquired loans 6,837 (4,076 ) 680 (3,396 ) 518 3,959 Total allowance $ 179,247 $ (22,630 ) $ 4,403 $ (18,227 ) $ 15,554 $ 176,574 Six Months Ended June 30, 2018 Commercial real estate $ 50,281 $ (4,479 ) $ 1,102 $ (3,377 ) $ 3,683 $ 50,587 Commercial and industrial 51,963 (12,047 ) 1,526 (10,521 ) 12,247 53,689 Commercial leases 5,646 (207 ) 24 (183 ) 1,576 7,039 Other 1,843 (2,375 ) 569 (1,806 ) 1,959 1,996 Total commercial loans and leases 109,733 (19,108 ) 3,221 (15,887 ) 19,465 113,311 Direct installment 20,936 (6,392 ) 903 (5,489 ) 4,832 20,279 Residential mortgages 15,507 (393 ) 107 (286 ) (58 ) 15,163 Indirect installment 11,967 (4,627 ) 1,869 (2,758 ) 4,192 13,401 Consumer lines of credit 10,539 (1,636 ) 183 (1,453 ) 1,375 10,461 Total consumer loans 58,949 (13,048 ) 3,062 (9,986 ) 10,341 59,304 Total allowance on originated loans and leases 168,682 (32,156 ) 6,283 (25,873 ) 29,806 172,615 Purchased credit-impaired loans 635 — — — (11 ) 624 Other acquired loans 6,063 (4,385 ) 1,403 (2,982 ) 254 3,335 Total allowance on acquired loans 6,698 (4,385 ) 1,403 (2,982 ) 243 3,959 Total allowance for credit losses $ 175,380 $ (36,541 ) $ 7,686 $ (28,855 ) $ 30,049 $ 176,574 (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 June 30, 2017 Commercial real estate $ 46,389 $ (318 ) $ 505 $ 187 $ 382 $ 46,958 Commercial and industrial 53,570 (7,736 ) 183 (7,553 ) 8,091 54,108 Commercial leases 3,513 (208 ) 3 (205 ) 814 4,122 Other 1,809 (821 ) 353 (468 ) 497 1,838 Total commercial loans and leases 105,281 (9,083 ) 1,044 (8,039 ) 9,784 107,026 Direct installment 20,210 (3,245 ) 581 (2,664 ) 3,190 20,736 Residential mortgages 10,210 (182 ) 10 (172 ) 1,214 11,252 Indirect installment 9,630 (1,966 ) 614 (1,352 ) 2,296 10,574 Consumer lines of credit 8,883 (583 ) 150 (433 ) 1,054 9,504 Total consumer loans 48,933 (5,976 ) 1,355 (4,621 ) 7,754 52,066 Total allowance on originated loans and leases 154,214 (15,059 ) 2,399 (12,660 ) 17,538 159,092 Purchased credit-impaired loans 660 (1 ) — (1 ) (19 ) 640 Other acquired loans 5,908 (74 ) 896 822 (763 ) 5,967 Total allowance on acquired loans 6,568 (75 ) 896 821 (782 ) 6,607 Total allowance $ 160,782 $ (15,134 ) $ 3,295 $ (11,839 ) $ 16,756 $ 165,699 Six Months Ended June 30, 2017 Commercial real estate $ 46,635 $ (1,306 ) $ 866 $ (440 ) $ 763 $ 46,958 Commercial and industrial 47,991 (10,199 ) 657 (9,542 ) 15,659 54,108 Commercial leases 3,280 (714 ) 4 (710 ) 1,552 4,122 Other 1,392 (1,794 ) 680 (1,114 ) 1,560 1,838 Total commercial loans and leases 99,298 (14,013 ) 2,207 (11,806 ) 19,534 107,026 Direct installment 21,391 (6,119 ) 1,209 (4,910 ) 4,255 20,736 Residential mortgages 10,082 (362 ) 171 (191 ) 1,361 11,252 Indirect installment 10,564 (4,336 ) 1,395 (2,941 ) 2,951 10,574 Consumer lines of credit 9,456 (1,041 ) 315 (726 ) 774 9,504 Total consumer loans 51,493 (11,858 ) 3,090 (8,768 ) 9,341 52,066 Total allowance on originated loans and leases 150,791 (25,871 ) 5,297 (20,574 ) 28,875 159,092 Purchased credit-impaired loans 572 (1 ) — (1 ) 69 640 Other acquired loans 6,696 (556 ) 1,165 609 (1,338 ) 5,967 Total allowance on acquired loans 7,268 (557 ) 1,165 608 (1,269 ) 6,607 Total allowance for credit losses $ 158,059 $ (26,428 ) $ 6,462 $ (19,966 ) $ 27,606 $ 165,699 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 June 30, 2018 Commercial real estate $ 26 $ 50,561 $ 5,754,367 $ 8,521 $ 5,745,846 Commercial and industrial 4,392 49,297 3,797,773 18,482 3,779,291 Commercial leases — 7,039 337,397 — 337,397 Other — 1,996 43,351 — 43,351 Total commercial loans and leases 4,418 108,893 9,932,888 27,003 9,905,885 Direct installment — 20,279 1,772,090 — 1,772,090 Residential mortgages — 15,163 2,297,558 — 2,297,558 Indirect installment — 13,401 1,746,352 — 1,746,352 Consumer lines of credit — 10,461 1,136,293 — 1,136,293 Total consumer loans — 59,304 6,952,293 — 6,952,293 Total $ 4,418 $ 168,197 $ 16,885,181 $ 27,003 $ 16,858,178 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	6 Months Ended
	Jun. 30, 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 June 30, 2018 and December 31, 2017 , is listed below: (in thousands) June 30, December 31, 2017 Mortgage loans sold with servicing retained $ 3,605,603 $ 3,256,548 The following table summarizes activity relating to mortgage loans sold with servicing retained: Three Months Ended Six Months Ended (in thousands) 2018 2017 2018 2017 Mortgage loans sold with servicing retained $ 282,756 $ 226,600 $ 519,649 $ 356,443 Pretax gains resulting from above loan sales (1) 5,024 5,633 8,822 9,271 Mortgage servicing fees (1) 2,223 2,007 4,397 3,610 (1) Recorded in mortgage banking operations. Following is a summary of the MSR activity: Three Months Ended Six Months Ended (in thousands) 2018 2017 2018 2017 Balance at beginning of period $ 30,791 $ 22,866 $ 29,053 $ 13,521 Fair value of MSRs acquired — — — 8,553 Additions 3,315 2,576 6,025 4,030 Payoffs and curtailments (504 ) (441 ) (909 ) (580 ) Amortization (632 ) (557 ) (1,199 ) (1,080 ) Balance at end of period $ 32,970 $ 24,444 $ 32,970 $ 24,444 Fair value, beginning of period $ 36,445 $ 26,962 $ 32,419 $ 17,546 Fair value, end of period 38,603 27,173 38,603 27,173 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) June 30, December 31, Weighted average life (months) 84.8 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% $ 1,286 $ 1,737 +0.50% 2,319 3,220 -0.25% (1,584 ) (1,937 ) -0.50% (3,498 ) (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 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 June 30, 2018 and December 31, 2017 , was as follows: (in thousands) June 30, December 31, SBA loans sold to investors with servicing retained $ 305,632 $ 305,977 The following table summarizes activity relating to SBA loans sold with servicing retained: Three Months Ended Six Months Ended (in thousands) 2018 2017 2018 2017 SBA loans sold with servicing retained $ 11,225 $ 15,142 $ 23,513 $ 24,518 Pretax gains resulting from above loan sales (1) 1,171 816 2,272 816 SBA servicing fees (1) 699 627 1,449 742 (1) Recorded in non-interest income. Following is a summary of the activity in SBA servicing rights: Three Months Ended Six Months Ended (in thousands) 2018 2017 2018 2017 Balance at beginning of period $ 5,062 $ 5,339 $ 5,058 $ — Fair value of servicing rights acquired — — — 5,399 Additions 258 264 646 264 Impairment (charge) / recovery (139 ) — (229 ) — Amortization (287 ) (319 ) (581 ) (379 ) Balance at end of period $ 4,894 $ 5,284 $ 4,894 $ 5,284 Fair value, beginning of period $ 5,062 $ 5,339 $ 5,058 $ — Fair value, end of period 4,894 5,299 4,894 5,299 Following is a summary of key assumptions and the sensitivity of the SBA loan servicing rights to changes in these assumptions: June 30, 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) 58.2 63.5 Constant prepayment rate (annualized) 10.51 % $ (161 ) $ (312 ) $ — $ — 9.29 % $ (145 ) $ (284 ) $ — $ — Discount rate 15.08 — — (138 ) (269 ) 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 $0.5 million valuation allowance for SBA servicing rights as of June 30, 2018 .

BORROWINGS

BORROWINGS	6 Months Ended
	Jun. 30, 2018
Debt Disclosure [Abstract]
BORROWINGS	BORROWINGS Following is a summary of short-term borrowings: (in thousands) June 30, December 31, Securities sold under repurchase agreements $ 239,804 $ 256,017 Federal Home Loan Bank advances 2,800,000 2,285,000 Federal funds purchased 1,165,000 1,000,000 Subordinated notes 129,342 137,320 Total short-term borrowings $ 4,334,146 $ 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. Of the total short-term FHLB advances, 73.0% and 84.5% had overnight maturities as of June 30, 2018 and December 31, 2017 , respectively. Following is a summary of long-term borrowings: (in thousands) June 30, December 31, Federal Home Loan Bank advances $ 270,045 $ 310,061 Subordinated notes 88,762 87,614 Junior subordinated debt 110,587 110,347 Other subordinated debt 159,544 160,151 Total long-term borrowings $ 628,938 $ 668,173 Our banking affiliate has available credit with the FHLB of $7.7 billion , of which $3.1 billion was utilized as of June 30, 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 six months ended June 30, 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 June 30, 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 3.99 % LIBOR + 165 basis points (bps) Omega Financial Capital Trust I 26,000 1,114 26,493 10/18/2034 4.55 % LIBOR + 219 bps Yadkin Valley Statutory Trust I 25,000 774 20,987 12/15/2037 3.66 % LIBOR + 132 bps FNB Financial Services Capital Trust I 25,000 774 21,916 9/30/2035 3.80 % LIBOR + 146 bps American Community Capital Trust II 10,000 310 10,444 12/15/2033 5.11 % LIBOR + 280 bps Crescent Financial Capital Trust I 8,000 248 8,582 10/7/2033 5.45 % LIBOR + 310 bps Total $ 115,500 $ 3,885 $ 110,587

DERIVATIVE INSTRUMENTS AND HEDG

DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES	6 Months Ended
	Jun. 30, 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. June 30, 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 $ 855,000 $ — $ 4,372 $ 705,000 $ 228 $ 1,982 Interest rate swaps – not designated 2,542,255 4,755 7,974 2,245,442 1,169 11,599 Equity contracts – not designated 1,180 30 — 1,180 51 — Total subject to master netting arrangements 3,398,435 4,785 12,346 2,951,622 1,448 13,581 Not subject to master netting arrangements: Interest rate swaps – not designated 2,542,255 14,219 53,724 2,245,442 27,233 15,303 Interest rate lock commitments – not designated 91,659 1,662 7 88,107 1,594 5 Forward delivery commitments – not designated 107,830 221 336 106,572 233 148 Credit risk contracts – not designated 243,297 — — 235,196 39 109 Equity contracts – not designated 1,180 — 30 1,180 — 51 Total not subject to master netting arrangements 2,986,221 16,102 54,097 2,676,497 29,099 15,616 Total $ 6,384,656 $ 20,887 $ 66,443 $ 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 seven 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) June 30, December 31, Notional amount $ 855,000 $ 705,000 Fair value included in other assets — 228 Fair value included in other liabilities 4,372 1,982 The following table shows amounts reclassified from accumulated other comprehensive income for the six months ended June 30, 2018 : (in thousands) Total Net of Tax Reclassified from AOCI to interest income $ 25 $ 20 Reclassified from AOCI to interest expense (902 ) (713 ) As of June 30, 2018 , the maximum length of time over which forecasted interest cash flows are hedged is 5 years. In the twelve months that follow June 30, 2018 , we expect to reclassify from the amount currently reported in AOCI net derivative gains of $3.4 million ( $2.7 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 June 30, 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 six months ended June 30, 2018 and 2017 , there was no hedge ineffectiveness. Also, during the six months ended June 30, 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) June 30, December 31, Notional amount $ 5,084,510 $ 4,490,884 Fair value included in other assets 18,974 28,402 Fair value included in other liabilities 61,698 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 $157.2 million as of June 30, 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 zero at June 30, 2018 and $0.1 million at December 31, 2017 . The fair values of risk participation agreements purchased and sold were $0.2 million and $(0.3) 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 $0.4 million and $0.9 million as of June 30, 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 June 30, 2018 Derivative Assets Interest rate contracts: Designated $ — $ — $ — $ — Not designated 4,755 4,704 — 51 Equity contracts – not designated 30 30 — — Total $ 4,785 $ 4,734 $ — $ 51 Derivative Liabilities Interest rate contracts: Designated $ 4,372 $ 4,372 $ — $ — Not designated 7,974 7,579 — 395 Total $ 12,346 $ 11,951 $ — $ 395 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: Six Months Ended (in thousands) Income Statement Location 2018 2017 Interest Rate Contracts Interest income - loans and leases $ 25 $ 900 Interest Rate Contracts Interest expense – short-term borrowings (902 ) 652 Interest Rate Swaps Other income 1,259 (465 ) Credit Risk Contracts Other income 70 21

COMMITMENTS, CREDIT RISK AND CO

COMMITMENTS, CREDIT RISK AND CONTINGENCIES	6 Months Ended
	Jun. 30, 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) June 30, December 31, Commitments to extend credit $ 7,223,071 $ 6,957,822 Standby letters of credit 137,054 132,904 At June 30, 2018 , funding of 76.9% 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	6 Months Ended
	Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
STOCK INCENTIVE PLANS	STOCK INCENTIVE PLANS Restricted Stock We issue restricted stock awards 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. We issued 283,037 and 251,379 performance-based restricted stock units during the first six months of 2018 and 2017 . For performance-based restricted stock awards granted in 2018, we incorporated a new metric in which recipients will earn shares totaling between 0% and 175% of the number of units issued, based on our return on average tangible assets (ROATA) relative to a specified peer group of financial institutions over the three -year period. The result calculated using ROATA will then be adjusted by 75% to 125% , based on our total shareholder return (TSR) relative to the specified peer group of financial institutions. For performance-based restricted stock awards granted from 2014 through 2017, the recipients will earn shares, totaling between 0% and 175% of the number of units issued, based on our TSR relative to a specified peer group of financial institutions over the three -year period. These market-based restricted stock award units are included in the table below based on where we expect them to vest, regardless of the actual vesting percentages. As of June 30, 2018 , we had available up to 2,333,089 shares of common stock to issue under this Plan. The following table details our issuance of restricted stock units and the aggregate weighted average grant date fair values under these plans for the years indicated. Six Months Ended (dollars in thousands) 2018 2017 Restricted stock units 937,155 707,851 Weighted average grant date fair values $ 12,370 $ 10,398 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 units during the periods indicated: Six Months Ended June 30, 2018 2017 Units Weighted Average Grant Price per Share Units Weighted Average Grant Price per Share Unvested units outstanding at beginning of period 1,975,862 $ 13.64 1,836,363 $ 12.97 Granted 937,155 13.20 707,851 14.69 Vested (257,712 ) 13.18 (592,202 ) 12.84 Forfeited/expired (180,723 ) 13.30 (14,679 ) 13.23 Dividend reinvestment 38,129 14.02 28,454 14.49 Unvested units outstanding at end of period 2,512,711 13.56 1,965,787 13.65 The following table provides certain information related to restricted stock units: (in thousands) Six Months Ended 2018 2017 Stock-based compensation expense $ 4,699 $ 3,958 Tax benefit related to stock-based compensation expense 987 1,385 Fair value of units vested 3,472 8,013 As of June 30, 2018 , there was $19.1 million of unrecognized compensation cost related to unvested restricted stock units, including $1.3 million that is subject to accelerated vesting under the Plan’s immediate vesting upon retirement. The components of the restricted stock units as of June 30, 2018 are as follows: (dollars in thousands) Service- Based Units Performance- Based Units Total Unvested restricted stock units 1,449,400 1,063,311 2,512,711 Unrecognized compensation expense $ 12,405 $ 6,646 $ 19,051 Intrinsic value $ 19,451 $ 14,270 $ 33,721 Weighted average remaining life (in years) 2.29 2.05 2.19 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: Six Months Ended June 30, 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 (197,390 ) 7.93 (155,597 ) 9.43 Forfeited/expired (4,598 ) 11.65 (56,510 ) 11.17 Options outstanding and exercisable at end of period 520,662 7.96 888,070 8.72 The intrinsic value of outstanding and exercisable stock options at June 30, 2018 was $2.8 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	6 Months Ended
	Jun. 30, 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 6% that the employee defers. During the second quarter of 2018, we made a one-time discretionary contribution of $0.9 million to the vast majority of our employees following the tax reform that was enacted in December 2017. Additionally, we may provide a performance-based company contribution of up to 3% if we exceed annual financial goals. Our contribution expense is presented in the following table: Six Months Ended (in thousands) 2018 2017 401(k) contribution expense $ 8,146 $ 6,150 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 Six Months Ended (in thousands) 2018 2017 2018 2017 Service cost $ (4 ) $ (4 ) $ (8 ) $ (8 ) Interest cost 1,560 1,477 3,120 2,954 Expected return on plan assets (2,895 ) (2,427 ) (5,790 ) (4,854 ) Amortization: Unrecognized prior service cost — 2 — 4 Unrecognized loss 623 628 1,246 1,256 Net periodic pension credit $ (716 ) $ (324 ) $ (1,432 ) $ (648 )

INCOME TAXES

INCOME TAXES	6 Months Ended
	Jun. 30, 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 Six Months Ended (in thousands) 2018 2017 2018 2017 Current income taxes: Federal taxes $ 5,749 $ 6,602 $ 23,449 $ 13,290 State taxes 1,045 1,086 2,749 1,585 Total current income taxes 6,794 7,688 26,198 14,875 Deferred income taxes: Federal taxes 13,256 22,460 15,158 24,150 State taxes 421 (531 ) 383 (2,924 ) Total deferred income taxes 13,677 21,929 15,541 21,226 Total income taxes $ 20,471 $ 29,617 $ 41,739 $ 36,101 Statutory tax rate 21.0 % 35.0 % 21.0 % 35.0 % Effective tax rate 19.4 % 28.5 % 19.5 % 27.0 % The effective tax rate for the six months ended June 30, 2018 under the 21% TCJA statutory federal tax rate was 19.5% . The effective tax rate for the six months ended June 30, 2017 under the former 35% statutory federal tax rate was 27.0% . The effective tax rate for the six months ended June 30, 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 six months ended June 30, 2017 primarily related to merger expenses and an increase in the level of tax credits. 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	6 Months Ended
	Jun. 30, 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 Six Months Ended June 30, 2018 Balance at beginning of period $ (29,626 ) $ 5,407 $ (58,833 ) $ (83,052 ) Other comprehensive (loss) income before reclassifications (38,660 ) 5,600 972 (32,088 ) Amounts reclassified from AOCI (24 ) (721 ) — (745 ) Net current period other comprehensive (loss) income (38,684 ) 4,879 972 (32,833 ) Balance at end of period $ (68,310 ) $ 10,286 $ (57,861 ) $ (115,885 ) 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	6 Months Ended
	Jun. 30, 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 Six Months Ended ( dollars in thousands, except per share data) 2018 2017 2018 2017 Net income $ 85,206 $ 74,406 $ 171,968 $ 97,385 Less: Preferred stock dividends 2,010 2,010 4,020 4,020 Net income available to common stockholders $ 83,196 $ 72,396 $ 167,948 $ 93,365 Basic weighted average common shares outstanding 324,170,177 323,303,460 323,956,752 280,578,720 Net effect of dilutive stock options, warrants and restricted stock 1,559,872 1,564,299 1,772,440 1,706,762 Diluted weighted average common shares outstanding 325,730,049 324,867,759 325,729,192 282,285,482 Earnings per common share: Basic $ 0.26 $ 0.22 $ 0.52 $ 0.33 Diluted $ 0.26 $ 0.22 $ 0.52 $ 0.33 The following table shows the average shares excluded from the above calculation as their effect would have been anti-dilutive: Three Months Ended Six Months Ended 2018 2017 2018 2017 Average shares excluded from the diluted earnings per common share calculation 72 1,266 46 8,107

CASH FLOW INFORMATION

CASH FLOW INFORMATION	6 Months Ended
	Jun. 30, 2018
Supplemental Cash Flow Elements [Abstract]
CASH FLOW INFORMATION	CASH FLOW INFORMATION Following is a summary of supplemental cash flow information: Six Months Ended 2018 2017 (in thousands) Interest paid on deposits and other borrowings $ 98,926 $ 51,611 Income taxes paid 6,000 43,500 Transfers of loans to other real estate owned 7,967 22,451

BUSINESS SEGMENTS

BUSINESS SEGMENTS	6 Months Ended
	Jun. 30, 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, 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. In June, we announced plans to divest our Consumer Finance subsidiary as part of our strategy to enhance the overall positioning of our consumer banking operations. We entered a definitive stock purchase agreement to sell 100 percent of the issued and outstanding capital stock of Regency to Mariner Finance, LLC. The sale of Regency is expected to close during the second half of 2018, subject to receipt of regulatory approvals and other customary closing conditions. We expect this transaction to accomplish several strategic objectives, including enhancing the credit risk profile of the consumer loan portfolio, offering additional liquidity and selling a non-strategic business segment that does not fit with our core business. 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 June 30, 2018 Interest income $ 284,768 $ — $ 19 $ 9,349 $ (19 ) $ 294,117 Interest expense 50,118 — — 885 3,759 54,762 Net interest income 234,650 — 19 8,464 (3,778 ) 239,355 Provision for credit losses 13,277 — — 2,277 — 15,554 Non-interest income 51,137 11,239 3,695 653 (1,835 ) 64,889 Non-interest expense (1) 159,675 8,694 3,895 5,293 1,645 179,202 Amortization of intangibles 3,699 60 52 — — 3,811 Income tax expense (benefit) 21,291 581 (43 ) 444 (1,802 ) 20,471 Net income (loss) 87,845 1,904 (190 ) 1,103 (5,456 ) 85,206 Total assets 32,034,457 25,152 22,114 167,678 8,162 32,257,563 Total intangibles 2,311,429 10,067 12,140 1,809 — 2,335,445 At or for the Three Months Ended June 30, 2017 Interest income $ 241,917 $ — $ 19 $ 10,114 $ (1,016 ) $ 251,034 Interest expense 28,414 — — 888 3,317 32,619 Net interest income 213,503 — 19 9,226 (4,333 ) 218,415 Provision for credit losses 14,738 — — 2,018 — 16,756 Non-interest income 53,031 9,821 3,496 770 (1,040 ) 66,078 Non-interest expense (1) 141,441 7,987 3,456 5,288 729 158,901 Amortization of intangibles 4,694 65 54 — — 4,813 Income tax expense (benefit) 30,200 651 10 1,073 (2,317 ) 29,617 Net income (loss) 75,461 1,118 (5 ) 1,617 (3,785 ) 74,406 Total assets 30,487,402 22,028 22,311 183,859 38,126 30,753,726 Total intangibles 2,322,326 10,288 12,231 1,809 — 2,346,654 (1) Excludes amortization of intangibles, which is presented separately. (in thousands) Community Banking Wealth Management Insurance Consumer Finance Parent and Other Consolidated At or for the Six Months Ended June 30, 2018 Interest income $ 548,355 $ — $ 39 $ 18,643 $ 7 $ 567,044 Interest expense 92,478 — — 1,795 7,311 101,584 Net interest income 455,877 — 39 16,848 (7,304 ) 465,460 Provision for credit losses 25,689 — — 4,360 — 30,049 Non-interest income 104,449 22,241 7,998 1,291 (3,587 ) 132,392 Non-interest expense (1) 308,342 16,972 7,606 10,523 2,624 346,067 Amortization of intangibles 7,804 121 104 — — 8,029 Income tax expense (benefit) 43,011 1,170 81 918 (3,441 ) 41,739 Net income (loss) 175,480 3,978 246 2,338 (10,074 ) 171,968 Total assets 32,034,457 25,152 22,114 167,678 8,162 32,257,563 Total intangibles 2,311,429 10,067 12,140 1,809 — 2,335,445 At or for the Six Months Ended June 30, 2017 Interest income $ 427,298 $ — $ 39 $ 20,016 $ (1,626 ) $ 445,727 Interest expense 47,279 — — 1,810 5,471 54,560 Net interest income 380,019 — 39 18,206 (7,097 ) 391,167 Provision for credit losses 23,802 — — 3,804 — 27,606 Non-interest income 93,748 19,370 7,821 1,480 (1,225 ) 121,194 Non-interest expense (1) 309,725 15,527 6,771 10,519 816 343,358 Amortization of intangibles 7,676 126 109 — — 7,911 Income tax expense (benefit) 36,511 1,362 357 2,140 (4,269 ) 36,101 Net income (loss) 96,053 2,355 623 3,223 (4,869 ) 97,385 Total assets 30,487,402 22,028 22,311 183,859 38,126 30,753,726 Total intangibles 2,322,326 10,288 12,231 1,809 — 2,346,654 (1) Excludes amortization of intangibles, which is presented separately.

FAIR VALUE MEASUREMENTS

FAIR VALUE MEASUREMENTS	6 Months Ended
	Jun. 30, 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 six -month periods ended June 30, 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 June 30, 2018 Assets Measured at Fair Value Debt securities available for sale U.S. government agencies $ — $ 95,526 $ — $ 95,526 U.S. government-sponsored entities — 306,934 — 306,934 Residential mortgage-backed securities: Agency mortgage-backed securities — 1,577,596 — 1,577,596 Agency collateralized mortgage obligations — 831,817 — 831,817 Non-agency collateralized mortgage obligations — — — — Commercial mortgage-backed securities — 168,324 — 168,324 States of the U.S. and political subdivisions — 20,735 — 20,735 Other debt securities — 1,855 — 1,855 Total debt securities available for sale — 3,002,787 — 3,002,787 Loans held for sale — 28,213 — 28,213 Marketable equity securities Fixed income mutual fund 177 — — 177 Financial services industry — 995 — 995 Total marketable equity securities 177 995 — 1,172 Derivative financial instruments Trading — 19,004 — 19,004 Not for trading — 221 1,662 1,883 Total derivative financial instruments — 19,225 1,662 20,887 Total assets measured at fair value on a recurring basis $ 177 $ 3,051,220 $ 1,662 $ 3,053,059 Liabilities Measured at Fair Value Derivative financial instruments Trading $ — $ 61,728 $ — $ 61,728 Not for trading — 4,708 7 4,715 Total derivative financial instruments — 66,436 7 66,443 Total liabilities measured at fair value on a recurring basis $ — $ 66,436 $ 7 $ 66,443 (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 Six Months Ended June 30, 2018 Balance at beginning of period $ — $ — $ — $ 1,594 $ 1,594 Purchases, issuances, sales and settlements: Purchases — — — 1,662 1,662 Settlements — — — (1,594 ) (1,594 ) Balance at end of period $ — $ — $ — $ 1,662 $ 1,662 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 six 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 six 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 six months ended June 30, 2018 , we recorded in earnings $0.6 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 six months ended June 30, 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 June 30, 2018 Impaired loans $ — $ 1,460 $ 6,135 $ 7,595 Other real estate owned — — 5,500 5,500 Other assets - SBA servicing asset — — 4,894 4,894 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 six months or twelve months ended June 30, 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 six months ended June 30, 2018 had a carrying amount of $7.6 million , which includes an allocated allowance for credit losses of $4.4 million . The allowance for credit losses includes a provision applicable to the current period fair value measurements of $4.7 million , which was included in the provision for credit losses for the six months ended June 30, 2018 . OREO with a carrying amount of $7.6 million was written down to $5.5 million , resulting in a loss of $2.1 million , which was included in earnings for the six months ended June 30, 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 June 30, 2018 Financial Assets Cash and cash equivalents $ 433,699 $ 433,699 $ 433,699 $ — $ — Debt securities available for sale 3,002,787 3,002,787 — 3,002,787 — Debt securities held to maturity 3,295,081 3,181,275 — 3,181,275 — Net loans and leases, including loans held for sale 21,527,120 21,163,711 — 28,213 21,135,498 Loan servicing rights 37,864 43,497 — — 43,497 Marketable equity securities 1,172 1,172 177 995 — Derivative assets 20,887 20,887 — 19,225 1,662 Accrued interest receivable 93,210 93,210 93,210 — — Financial Liabilities Deposits 22,539,787 22,481,472 17,668,799 4,812,673 — Short-term borrowings 4,334,146 4,334,835 4,334,835 — — Long-term borrowings 628,938 624,104 — — 624,104 Derivative liabilities 66,443 66,443 — 66,436 7 Accrued interest payable 15,138 15,138 15,138 — — 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)	6 Months Ended
	Jun. 30, 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 June 30, 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 June 30, 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 and regulatory capital. We have created a cross-functional steering committee to govern implementation as we continue to review and enhance our business processes, information systems and controls to support recognition and disclosures under this Update including designing and building the models that will be used to calculate the expected credit losses. The impact of this Update will be dependent on the portfolio composition, credit quality and forecasts of 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) ASU 2018-10, Codification Improvements to Topic 842, Leases ASU 2018-11, Leases (Topic 842), Targeted Improvements These Updates require 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. These Updates are to be applied using a modified retrospective application including a number of optional practical expedients. We are in the process of classifying our existing lease portfolios, implementing a software solution, and assessing the potential impact to our Consolidated Financial Statements. We do not believe this update will materially impact our consolidated net income. 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)	6 Months Ended
	Jun. 30, 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: June 30, 2018 U.S. government agencies $ 96,085 $ — $ (559 ) $ 95,526 U.S. government-sponsored entities 312,903 — (5,969 ) 306,934 Residential mortgage-backed securities: Agency mortgage-backed securities 1,626,353 390 (49,147 ) 1,577,596 Agency collateralized mortgage obligations 863,976 29 (32,188 ) 831,817 Non-agency collateralized mortgage obligations — — — — Commercial mortgage-backed securities 168,466 154 (296 ) 168,324 States of the U.S. and political subdivisions 20,795 2 (62 ) 20,735 Other debt securities 1,949 — (94 ) 1,855 Total debt securities available for sale $ 3,090,527 $ 575 $ (88,315 ) $ 3,002,787 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: June 30, 2018 U.S. Treasury $ 500 $ 107 $ — $ 607 U.S. government agencies 2,056 60 — 2,116 U.S. government-sponsored entities 245,017 — (6,030 ) 238,987 Residential mortgage-backed securities: Agency mortgage-backed securities 1,125,947 295 (33,439 ) 1,092,803 Agency collateralized mortgage obligations 840,073 768 (34,063 ) 806,778 Commercial mortgage-backed securities 79,124 7 (1,555 ) 77,576 States of the U.S. and political subdivisions 1,002,364 1,626 (41,582 ) 962,408 Total debt securities held to maturity $ 3,295,081 $ 2,863 $ (116,669 ) $ 3,181,275 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 Six Months Ended (in thousands) 2018 2017 2018 2017 Gross gains $ 31 $ 611 $ 31 $ 4,011 Gross losses — (118 ) — (893 ) Net gains $ 31 $ 493 $ 31 $ 3,118
Amortized Cost and Fair Value of Securities, by Contractual Maturities	As of June 30, 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 $ 65,485 $ 65,271 $ 55,457 $ 55,236 Due from one to five years 262,288 256,488 201,924 196,157 Due from five to ten years 19,860 19,709 95,166 94,334 Due after ten years 84,099 83,582 897,390 858,391 431,732 425,050 1,249,937 1,204,118 Residential mortgage-backed securities: Agency mortgage-backed securities 1,626,353 1,577,596 1,125,947 1,092,803 Agency collateralized mortgage obligations 863,976 831,817 840,073 806,778 Commercial mortgage-backed securities 168,466 168,324 79,124 77,576 Total debt securities $ 3,090,527 $ 3,002,787 $ 3,295,081 $ 3,181,275
Schedule of Securities Pledged as Collateral	Following is information relating to securities pledged: (dollars in thousands) June 30, December 31, Securities pledged (carrying value): To secure public deposits, trust deposits and for other purposes as required by law $ 3,370,601 $ 3,491,634 As collateral for short-term borrowings 261,140 263,756 Securities pledged as a percent of total securities 57.7 % 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 June 30, 2018 U.S. government agencies 13 $ 95,526 $ (559 ) — $ — $ — 13 $ 95,526 $ (559 ) U.S. government-sponsored entities 5 106,668 (1,236 ) 10 200,266 (4,733 ) 15 306,934 (5,969 ) Residential mortgage-backed securities: Agency mortgage-backed securities 59 1,145,743 (30,600 ) 28 418,672 (18,547 ) 87 1,564,415 (49,147 ) Agency collateralized mortgage obligations 17 491,313 (16,023 ) 33 292,579 (16,165 ) 50 783,892 (32,188 ) Commercial mortgage-backed securities 2 74,167 (296 ) — — — 2 74,167 (296 ) States of the U.S. and political subdivisions 7 11,476 (55 ) 1 877 (7 ) 8 12,353 (62 ) Other debt securities — — — 3 1,855 (94 ) 3 1,855 (94 ) Total temporarily impaired debt securities AFS 103 $ 1,924,893 $ (48,769 ) 75 $ 914,249 $ (39,546 ) 178 $ 2,839,142 $ (88,315 ) 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 June 30, 2018 U.S. government-sponsored entities 4 $ 54,509 $ (508 ) 10 $ 184,478 $ (5,522 ) 14 $ 238,987 $ (6,030 ) Residential mortgage-backed securities: Agency mortgage-backed securities 80 909,762 (25,390 ) 11 164,501 (8,049 ) 91 1,074,263 (33,439 ) Agency collateralized mortgage obligations 17 299,575 (8,104 ) 35 420,914 (25,959 ) 52 720,489 (34,063 ) Commercial mortgage-backed securities 8 54,920 (884 ) 4 21,531 (671 ) 12 76,451 (1,555 ) States of the U.S. and political subdivisions 174 616,117 (24,296 ) 37 110,429 (17,286 ) 211 726,546 (41,582 ) Total temporarily impaired debt securities HTM 283 $ 1,934,883 $ (59,182 ) 97 $ 901,853 $ (57,487 ) 380 $ 2,836,736 $ (116,669 ) 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)	6 Months Ended
	Jun. 30, 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 June 30, 2018 Commercial real estate $ 5,754,367 $ 3,079,955 $ 8,834,322 Commercial and industrial 3,797,773 503,614 4,301,387 Commercial leases 337,397 — 337,397 Other 43,351 — 43,351 Total commercial loans and leases 9,932,888 3,583,569 13,516,457 Direct installment 1,772,090 119,990 1,892,080 Residential mortgages 2,297,558 553,412 2,850,970 Indirect installment 1,746,352 157 1,746,509 Consumer lines of credit 1,136,293 517,273 1,653,566 Total consumer loans 6,952,293 1,190,832 8,143,125 Total loans and leases, net of unearned income $ 16,885,181 $ 4,774,401 $ 21,659,582 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) June 30, December 31, Commercial construction, acquisition and development loans $ 1,176,326 $ 1,170,175 Percent of total loans and leases 5.4 % 5.6 % Commercial real estate: Percent owner-occupied 35.0 % 35.3 % Percent non-owner-occupied 65.0 % 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) June 30, December 31, Accounted for under ASC 310-30: Outstanding balance $ 4,387,378 $ 5,176,015 Carrying amount 4,101,583 4,834,256 Accounted for under ASC 310-20: Outstanding balance 688,541 835,130 Carrying amount 668,859 812,322 Total acquired loans: Outstanding balance 5,075,919 6,011,145 Carrying amount 4,770,442 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. Six Months Ended (in thousands) 2018 2017 Balance at beginning of period $ 708,481 $ 467,070 Acquisitions — 444,715 Reduction due to unexpected early payoffs (94,456 ) (61,093 ) Reclass from non-accretable difference 128,955 40,304 Disposals/transfers (408 ) (324 ) Other (1,619 ) — Accretion (116,006 ) (100,628 ) Balance at end of period $ 624,947 $ 790,044
Summary of Non-Performing Assets	Following is a summary of non-performing assets: (dollars in thousands) June 30, December 31, Non-accrual loans $ 68,696 $ 74,635 Troubled debt restructurings 24,820 23,481 Total non-performing loans 93,516 98,116 Other real estate owned 39,240 40,606 Total non-performing assets $ 132,756 $ 138,722 Asset quality ratios: Non-performing loans / total loans and leases 0.43 % 0.47 % Non-performing loans + OREO / total loans and leases + OREO 0.61 % 0.66 % Non-performing assets / total assets 0.41 % 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 (4) Current Total Loans and Leases Originated Loans and Leases June 30, 2018 Commercial real estate $ 10,476 $ 2 $ 14,652 $ 25,130 $ 5,729,237 $ 5,754,367 Commercial and industrial 5,663 3 23,367 29,033 3,768,740 3,797,773 Commercial leases 861 — 1,218 2,079 335,318 337,397 Other 163 204 1,000 1,367 41,984 43,351 Total commercial loans and leases 17,163 209 40,237 57,609 9,875,279 9,932,888 Direct installment 9,317 4,028 7,402 20,747 1,751,343 1,772,090 Residential mortgages 10,046 1,596 6,882 18,524 2,279,034 2,297,558 Indirect installment 7,592 355 2,152 10,099 1,736,253 1,746,352 Consumer lines of credit 4,187 1,039 3,280 8,506 1,127,787 1,136,293 Total consumer loans 31,142 7,018 19,716 57,876 6,894,417 6,952,293 Total originated loans and leases $ 48,305 $ 7,227 $ 59,953 $ 115,485 $ 16,769,696 $ 16,885,181 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) (3) Current (Discount) Premium Total Loans Acquired Loans June 30, 2018 Commercial real estate $ 20,622 $ 53,440 $ 3,231 $ 77,293 $ 3,181,557 $ (178,895 ) $ 3,079,955 Commercial and industrial 1,620 3,498 4,347 9,465 526,830 (32,681 ) 503,614 Total commercial loans 22,242 56,938 7,578 86,758 3,708,387 (211,576 ) 3,583,569 Direct installment 3,766 1,131 — 4,897 115,496 (403 ) 119,990 Residential mortgages 10,424 7,697 — 18,121 552,387 (17,096 ) 553,412 Indirect installment — 1 — 1 1 155 157 Consumer lines of credit 7,042 2,122 1,165 10,329 518,027 (11,083 ) 517,273 Total consumer loans 21,232 10,951 1,165 33,348 1,185,911 (28,427 ) 1,190,832 Total acquired loans $ 43,474 $ 67,889 $ 8,743 $ 120,106 $ 4,894,298 $ (240,003 ) $ 4,774,401 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 June 30, 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. (3) Approximately $28.5 million of acquired past-due or non-accrual loans were sold during the second quarter of 2018. (4) Approximately $14.7 million of originated past-due or non-accrual loans were sold during the second quarter of 2018.
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 June 30, 2018 Commercial real estate $ 5,499,238 $ 131,806 $ 123,297 $ 26 $ 5,754,367 Commercial and industrial 3,537,536 176,599 79,246 4,392 3,797,773 Commercial leases 326,574 2,274 8,549 — 337,397 Other 42,037 110 1,204 — 43,351 Total originated commercial loans and leases $ 9,405,385 $ 310,789 $ 212,296 $ 4,418 $ 9,932,888 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 June 30, 2018 Commercial real estate $ 2,661,433 $ 200,723 $ 217,626 $ 173 $ 3,079,955 Commercial and industrial 434,731 26,981 41,902 — 503,614 Total acquired commercial loans $ 3,096,164 $ 227,704 $ 259,528 $ 173 $ 3,583,569 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 June 30, 2018 Direct installment $ 1,756,297 $ 15,793 $ 1,772,090 Residential mortgages 2,279,790 17,768 2,297,558 Indirect installment 1,744,007 2,345 1,746,352 Consumer lines of credit 1,131,322 4,971 1,136,293 Total originated consumer loans $ 6,911,416 $ 40,877 $ 6,952,293 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 June 30, 2018 Direct installment $ 119,921 $ 69 $ 119,990 Residential mortgages 553,412 — 553,412 Indirect installment 157 — 157 Consumer lines of credit 515,659 1,614 517,273 Total acquired consumer loans $ 1,189,149 $ 1,683 $ 1,190,832 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 Six Months Ended June 30, 2018 Commercial real estate $ 16,428 $ 14,308 $ 201 $ 14,509 $ 26 $ 20,912 Commercial and industrial 28,738 13,020 10,787 23,807 4,392 23,688 Commercial leases 1,218 1,218 — 1,218 — 1,309 Other — — — — — — Total commercial loans and leases 46,384 28,546 10,988 39,534 4,418 45,909 Direct installment 18,603 15,793 — 15,793 — 15,693 Residential mortgages 19,180 17,768 — 17,768 — 16,973 Indirect installment 4,579 2,345 — 2,345 — 2,387 Consumer lines of credit 6,735 4,971 — 4,971 — 4,741 Total consumer loans 49,097 40,877 — 40,877 — 39,794 Total $ 95,481 $ 69,423 $ 10,988 $ 80,411 $ 4,418 $ 85,703 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) June 30, December 31, Commercial real estate $ 2,892 $ 4,976 Commercial and industrial 78 (415 ) Total commercial loans 2,970 4,561 Direct installment 562 1,553 Residential mortgages 191 484 Indirect installment 250 177 Consumer lines of credit (14 ) (77 ) Total consumer loans 989 2,137 Total allowance on acquired loans $ 3,959 $ 6,698
Summary of the composition of total TDRs	Following is a summary of the composition of total TDRs: (in thousands) Originated Acquired Total June 30, 2018 Accruing: Performing $ 19,352 $ 168 $ 19,520 Non-performing 21,689 3,131 24,820 Non-accrual 9,323 51 9,374 Total TDRs $ 50,364 $ 3,350 $ 53,714 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) June 30, December 31, Specific reserves for commercial TDRs $ 14 $ 95 Pooled reserves for individual commercial loans 529 469
Summary of Troubled Debt Restructurings by Class of Loans	Following is a summary of TDR loans, by class: Three Months Ended June 30, 2018 Six Months Ended June 30, 2018 (dollars in thousands) Number of Contracts Pre- Modification Outstanding Recorded Investment Post- Modification Outstanding Recorded Investment Number of Contracts Pre- Modification Outstanding Recorded Investment Post- Modification Outstanding Recorded Investment Commercial real estate 1 $ 125 $ 122 1 $ 125 $ 122 Commercial and industrial 13 862 780 13 2,524 1,384 Total commercial loans 14 987 902 14 2,649 1,506 Direct installment 178 2,372 2,276 357 3,404 3,209 Residential mortgages 8 304 298 19 807 799 Indirect installment 7 11 11 16 24 23 Consumer lines of credit 22 382 298 41 709 513 Total consumer loans 215 3,069 2,883 433 4,944 4,544 Total 229 $ 4,056 $ 3,785 447 $ 7,593 $ 6,050 Three Months Ended June 30, 2017 Six Months Ended June 30, 2017 (dollars in thousands) Number of Contracts Pre- Modification Outstanding Recorded Investment Post- Modification Outstanding Recorded Investment Number of Contracts Pre- Modification Outstanding Recorded Investment Post- Modification Outstanding Recorded Investment Commercial real estate 1 $ 463 $ 463 2 $ 595 $ 566 Commercial and industrial 2 4,038 4,204 2 3,542 4,204 Total commercial loans 3 4,501 4,667 4 4,137 4,770 Direct installment 162 1,448 1,301 333 2,951 2,688 Residential mortgages 9 405 345 16 570 497 Indirect installment 4 15 14 9 31 27 Consumer lines of credit 21 311 208 43 1,054 905 Total consumer loans 196 2,179 1,868 401 4,606 4,117 Total 199 $ 6,680 $ 6,535 405 $ 8,743 $ 8,887
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 Six Months Ended (dollars in thousands) Number of Contracts Recorded Investment Number of Contracts Recorded Investment Direct installment 41 $ 202 78 $ 304 Residential mortgages 3 146 6 293 Indirect installment 5 10 9 15 Consumer lines of credit 2 56 3 252 Total consumer loans 51 414 96 864 Total 51 $ 414 96 $ 864 Three Months Ended Six Months Ended (dollars in thousands) Number of Contracts Recorded Investment Number of Contracts Recorded Investment Commercial and industrial 2 $ 312 3 $ 326 Total commercial loans 2 312 3 326 Direct installment 31 134 55 146 Residential mortgages 1 80 4 264 Indirect installment 6 19 10 19 Consumer lines of credit 1 63 1 63 Total consumer loans 39 296 70 492 Total 41 $ 608 73 $ 818

ALLOWANCE FOR CREDIT LOSSES (Ta

ALLOWANCE FOR CREDIT LOSSES (Tables)	6 Months Ended
	Jun. 30, 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 June 30, 2018 Commercial real estate $ 53,516 $ (4,254 ) $ 765 $ (3,489 ) $ 560 $ 50,587 Commercial and industrial 53,013 (6,127 ) 1,157 (4,970 ) 5,646 53,689 Commercial leases 6,115 (36 ) 14 (22 ) 946 7,039 Other 1,995 (1,578 ) 272 (1,306 ) 1,307 1,996 Total commercial loans and leases 114,639 (11,995 ) 2,208 (9,787 ) 8,459 113,311 Direct installment 20,128 (2,922 ) 463 (2,459 ) 2,610 20,279 Residential mortgages 15,280 (314 ) 16 (298 ) 181 15,163 Indirect installment 11,955 (2,218 ) 974 (1,244 ) 2,690 13,401 Consumer lines of credit 10,408 (1,105 ) 62 (1,043 ) 1,096 10,461 Total consumer loans 57,771 (6,559 ) 1,515 (5,044 ) 6,577 59,304 Total allowance on originated loans and leases 172,410 (18,554 ) 3,723 (14,831 ) 15,036 172,615 Purchased credit-impaired loans 622 — — — 2 624 Other acquired loans 6,215 (4,076 ) 680 (3,396 ) 516 3,335 Total allowance on acquired loans 6,837 (4,076 ) 680 (3,396 ) 518 3,959 Total allowance $ 179,247 $ (22,630 ) $ 4,403 $ (18,227 ) $ 15,554 $ 176,574 Six Months Ended June 30, 2018 Commercial real estate $ 50,281 $ (4,479 ) $ 1,102 $ (3,377 ) $ 3,683 $ 50,587 Commercial and industrial 51,963 (12,047 ) 1,526 (10,521 ) 12,247 53,689 Commercial leases 5,646 (207 ) 24 (183 ) 1,576 7,039 Other 1,843 (2,375 ) 569 (1,806 ) 1,959 1,996 Total commercial loans and leases 109,733 (19,108 ) 3,221 (15,887 ) 19,465 113,311 Direct installment 20,936 (6,392 ) 903 (5,489 ) 4,832 20,279 Residential mortgages 15,507 (393 ) 107 (286 ) (58 ) 15,163 Indirect installment 11,967 (4,627 ) 1,869 (2,758 ) 4,192 13,401 Consumer lines of credit 10,539 (1,636 ) 183 (1,453 ) 1,375 10,461 Total consumer loans 58,949 (13,048 ) 3,062 (9,986 ) 10,341 59,304 Total allowance on originated loans and leases 168,682 (32,156 ) 6,283 (25,873 ) 29,806 172,615 Purchased credit-impaired loans 635 — — — (11 ) 624 Other acquired loans 6,063 (4,385 ) 1,403 (2,982 ) 254 3,335 Total allowance on acquired loans 6,698 (4,385 ) 1,403 (2,982 ) 243 3,959 Total allowance for credit losses $ 175,380 $ (36,541 ) $ 7,686 $ (28,855 ) $ 30,049 $ 176,574 (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 June 30, 2017 Commercial real estate $ 46,389 $ (318 ) $ 505 $ 187 $ 382 $ 46,958 Commercial and industrial 53,570 (7,736 ) 183 (7,553 ) 8,091 54,108 Commercial leases 3,513 (208 ) 3 (205 ) 814 4,122 Other 1,809 (821 ) 353 (468 ) 497 1,838 Total commercial loans and leases 105,281 (9,083 ) 1,044 (8,039 ) 9,784 107,026 Direct installment 20,210 (3,245 ) 581 (2,664 ) 3,190 20,736 Residential mortgages 10,210 (182 ) 10 (172 ) 1,214 11,252 Indirect installment 9,630 (1,966 ) 614 (1,352 ) 2,296 10,574 Consumer lines of credit 8,883 (583 ) 150 (433 ) 1,054 9,504 Total consumer loans 48,933 (5,976 ) 1,355 (4,621 ) 7,754 52,066 Total allowance on originated loans and leases 154,214 (15,059 ) 2,399 (12,660 ) 17,538 159,092 Purchased credit-impaired loans 660 (1 ) — (1 ) (19 ) 640 Other acquired loans 5,908 (74 ) 896 822 (763 ) 5,967 Total allowance on acquired loans 6,568 (75 ) 896 821 (782 ) 6,607 Total allowance $ 160,782 $ (15,134 ) $ 3,295 $ (11,839 ) $ 16,756 $ 165,699 Six Months Ended June 30, 2017 Commercial real estate $ 46,635 $ (1,306 ) $ 866 $ (440 ) $ 763 $ 46,958 Commercial and industrial 47,991 (10,199 ) 657 (9,542 ) 15,659 54,108 Commercial leases 3,280 (714 ) 4 (710 ) 1,552 4,122 Other 1,392 (1,794 ) 680 (1,114 ) 1,560 1,838 Total commercial loans and leases 99,298 (14,013 ) 2,207 (11,806 ) 19,534 107,026 Direct installment 21,391 (6,119 ) 1,209 (4,910 ) 4,255 20,736 Residential mortgages 10,082 (362 ) 171 (191 ) 1,361 11,252 Indirect installment 10,564 (4,336 ) 1,395 (2,941 ) 2,951 10,574 Consumer lines of credit 9,456 (1,041 ) 315 (726 ) 774 9,504 Total consumer loans 51,493 (11,858 ) 3,090 (8,768 ) 9,341 52,066 Total allowance on originated loans and leases 150,791 (25,871 ) 5,297 (20,574 ) 28,875 159,092 Purchased credit-impaired loans 572 (1 ) — (1 ) 69 640 Other acquired loans 6,696 (556 ) 1,165 609 (1,338 ) 5,967 Total allowance on acquired loans 7,268 (557 ) 1,165 608 (1,269 ) 6,607 Total allowance for credit losses $ 158,059 $ (26,428 ) $ 6,462 $ (19,966 ) $ 27,606 $ 165,699
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 June 30, 2018 Commercial real estate $ 26 $ 50,561 $ 5,754,367 $ 8,521 $ 5,745,846 Commercial and industrial 4,392 49,297 3,797,773 18,482 3,779,291 Commercial leases — 7,039 337,397 — 337,397 Other — 1,996 43,351 — 43,351 Total commercial loans and leases 4,418 108,893 9,932,888 27,003 9,905,885 Direct installment — 20,279 1,772,090 — 1,772,090 Residential mortgages — 15,163 2,297,558 — 2,297,558 Indirect installment — 13,401 1,746,352 — 1,746,352 Consumer lines of credit — 10,461 1,136,293 — 1,136,293 Total consumer loans — 59,304 6,952,293 — 6,952,293 Total $ 4,418 $ 168,197 $ 16,885,181 $ 27,003 $ 16,858,178 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)	6 Months Ended
	Jun. 30, 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 June 30, 2018 and December 31, 2017 , is listed below: (in thousands) June 30, December 31, 2017 Mortgage loans sold with servicing retained $ 3,605,603 $ 3,256,548 The following table summarizes activity relating to mortgage loans sold with servicing retained: Three Months Ended Six Months Ended (in thousands) 2018 2017 2018 2017 Mortgage loans sold with servicing retained $ 282,756 $ 226,600 $ 519,649 $ 356,443 Pretax gains resulting from above loan sales (1) 5,024 5,633 8,822 9,271 Mortgage servicing fees (1) 2,223 2,007 4,397 3,610 (1) Recorded in mortgage banking operations. Following is a summary of the MSR activity: Three Months Ended Six Months Ended (in thousands) 2018 2017 2018 2017 Balance at beginning of period $ 30,791 $ 22,866 $ 29,053 $ 13,521 Fair value of MSRs acquired — — — 8,553 Additions 3,315 2,576 6,025 4,030 Payoffs and curtailments (504 ) (441 ) (909 ) (580 ) Amortization (632 ) (557 ) (1,199 ) (1,080 ) Balance at end of period $ 32,970 $ 24,444 $ 32,970 $ 24,444 Fair value, beginning of period $ 36,445 $ 26,962 $ 32,419 $ 17,546 Fair value, end of period 38,603 27,173 38,603 27,173
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) June 30, December 31, Weighted average life (months) 84.8 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% $ 1,286 $ 1,737 +0.50% 2,319 3,220 -0.25% (1,584 ) (1,937 ) -0.50% (3,498 ) (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 June 30, 2018 and December 31, 2017 , was as follows: (in thousands) June 30, December 31, SBA loans sold to investors with servicing retained $ 305,632 $ 305,977 The following table summarizes activity relating to SBA loans sold with servicing retained: Three Months Ended Six Months Ended (in thousands) 2018 2017 2018 2017 SBA loans sold with servicing retained $ 11,225 $ 15,142 $ 23,513 $ 24,518 Pretax gains resulting from above loan sales (1) 1,171 816 2,272 816 SBA servicing fees (1) 699 627 1,449 742 (1) Recorded in non-interest income. Following is a summary of the activity in SBA servicing rights: Three Months Ended Six Months Ended (in thousands) 2018 2017 2018 2017 Balance at beginning of period $ 5,062 $ 5,339 $ 5,058 $ — Fair value of servicing rights acquired — — — 5,399 Additions 258 264 646 264 Impairment (charge) / recovery (139 ) — (229 ) — Amortization (287 ) (319 ) (581 ) (379 ) Balance at end of period $ 4,894 $ 5,284 $ 4,894 $ 5,284 Fair value, beginning of period $ 5,062 $ 5,339 $ 5,058 $ — Fair value, end of period 4,894 5,299 4,894 5,299
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: June 30, 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) 58.2 63.5 Constant prepayment rate (annualized) 10.51 % $ (161 ) $ (312 ) $ — $ — 9.29 % $ (145 ) $ (284 ) $ — $ — Discount rate 15.08 — — (138 ) (269 ) 14.87 — — (147 ) (286 )

BORROWINGS (Tables)

BORROWINGS (Tables)	6 Months Ended
	Jun. 30, 2018
Debt Disclosure [Abstract]
Summary of Short-Term Borrowings	Following is a summary of short-term borrowings: (in thousands) June 30, December 31, Securities sold under repurchase agreements $ 239,804 $ 256,017 Federal Home Loan Bank advances 2,800,000 2,285,000 Federal funds purchased 1,165,000 1,000,000 Subordinated notes 129,342 137,320 Total short-term borrowings $ 4,334,146 $ 3,678,337
Summary of Long-Term Borrowings	Following is a summary of long-term borrowings: (in thousands) June 30, December 31, Federal Home Loan Bank advances $ 270,045 $ 310,061 Subordinated notes 88,762 87,614 Junior subordinated debt 110,587 110,347 Other subordinated debt 159,544 160,151 Total long-term borrowings $ 628,938 $ 668,173
Junior Subordinated Debt Trusts	The following table provides information relating to the Trusts as of June 30, 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 3.99 % LIBOR + 165 basis points (bps) Omega Financial Capital Trust I 26,000 1,114 26,493 10/18/2034 4.55 % LIBOR + 219 bps Yadkin Valley Statutory Trust I 25,000 774 20,987 12/15/2037 3.66 % LIBOR + 132 bps FNB Financial Services Capital Trust I 25,000 774 21,916 9/30/2035 3.80 % LIBOR + 146 bps American Community Capital Trust II 10,000 310 10,444 12/15/2033 5.11 % LIBOR + 280 bps Crescent Financial Capital Trust I 8,000 248 8,582 10/7/2033 5.45 % LIBOR + 310 bps Total $ 115,500 $ 3,885 $ 110,587

DERIVATIVE INSTRUMENTS AND HE35

DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Tables)	6 Months Ended
	Jun. 30, 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. June 30, 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 $ 855,000 $ — $ 4,372 $ 705,000 $ 228 $ 1,982 Interest rate swaps – not designated 2,542,255 4,755 7,974 2,245,442 1,169 11,599 Equity contracts – not designated 1,180 30 — 1,180 51 — Total subject to master netting arrangements 3,398,435 4,785 12,346 2,951,622 1,448 13,581 Not subject to master netting arrangements: Interest rate swaps – not designated 2,542,255 14,219 53,724 2,245,442 27,233 15,303 Interest rate lock commitments – not designated 91,659 1,662 7 88,107 1,594 5 Forward delivery commitments – not designated 107,830 221 336 106,572 233 148 Credit risk contracts – not designated 243,297 — — 235,196 39 109 Equity contracts – not designated 1,180 — 30 1,180 — 51 Total not subject to master netting arrangements 2,986,221 16,102 54,097 2,676,497 29,099 15,616 Total $ 6,384,656 $ 20,887 $ 66,443 $ 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 six months ended June 30, 2018 : (in thousands) Total Net of Tax Reclassified from AOCI to interest income $ 25 $ 20 Reclassified from AOCI to interest expense (902 ) (713 )
Effect of Derivative Financial Instruments on Income Statement	The following table presents the effect of certain derivative financial instruments on the Income Statement: Six Months Ended (in thousands) Income Statement Location 2018 2017 Interest Rate Contracts Interest income - loans and leases $ 25 $ 900 Interest Rate Contracts Interest expense – short-term borrowings (902 ) 652 Interest Rate Swaps Other income 1,259 (465 ) Credit Risk Contracts Other income 70 21
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) June 30, December 31, Notional amount $ 855,000 $ 705,000 Fair value included in other assets — 228 Fair value included in other liabilities 4,372 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) June 30, December 31, Notional amount $ 5,084,510 $ 4,490,884 Fair value included in other assets 18,974 28,402 Fair value included in other liabilities 61,698 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 June 30, 2018 Derivative Assets Interest rate contracts: Designated $ — $ — — $ — Not designated 4,755 4,704 — 51 Equity contracts – not designated 30 30 — — Total $ 4,785 $ 4,734 — $ 51 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 June 30, 2018 Derivative Liabilities Interest rate contracts: Designated $ 4,372 $ 4,372 — $ — Not designated 7,974 7,579 — 395 Total $ 12,346 $ 11,951 — $ 395 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)	6 Months Ended
	Jun. 30, 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) June 30, December 31, Commitments to extend credit $ 7,223,071 $ 6,957,822 Standby letters of credit 137,054 132,904

STOCK INCENTIVE PLANS (Tables)

STOCK INCENTIVE PLANS (Tables)	6 Months Ended
	Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Share-based Compensation, Restricted Stock Units Activity	The following table details our issuance of restricted stock units and the aggregate weighted average grant date fair values under these plans for the years indicated. Six Months Ended (dollars in thousands) 2018 2017 Restricted stock units 937,155 707,851 Weighted average grant date fair values $ 12,370 $ 10,398
Summary of Activity Relating to Restricted Stock Units	The following table summarizes the activity relating to restricted stock units during the periods indicated: Six Months Ended June 30, 2018 2017 Units Weighted Average Grant Price per Share Units Weighted Average Grant Price per Share Unvested units outstanding at beginning of period 1,975,862 $ 13.64 1,836,363 $ 12.97 Granted 937,155 13.20 707,851 14.69 Vested (257,712 ) 13.18 (592,202 ) 12.84 Forfeited/expired (180,723 ) 13.30 (14,679 ) 13.23 Dividend reinvestment 38,129 14.02 28,454 14.49 Unvested units outstanding at end of period 2,512,711 13.56 1,965,787 13.65
Schedule of Certain Information Related to Restricted Stock Units	The following table provides certain information related to restricted stock units: (in thousands) Six Months Ended 2018 2017 Stock-based compensation expense $ 4,699 $ 3,958 Tax benefit related to stock-based compensation expense 987 1,385 Fair value of units vested 3,472 8,013
Components of Restricted Stock Units	The components of the restricted stock units as of June 30, 2018 are as follows: (dollars in thousands) Service- Based Units Performance- Based Units Total Unvested restricted stock units 1,449,400 1,063,311 2,512,711 Unrecognized compensation expense $ 12,405 $ 6,646 $ 19,051 Intrinsic value $ 19,451 $ 14,270 $ 33,721 Weighted average remaining life (in years) 2.29 2.05 2.19
Summary of Activity Relating to Stock Options	The following table summarizes the activity relating to stock options during the periods indicated: Six Months Ended June 30, 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 (197,390 ) 7.93 (155,597 ) 9.43 Forfeited/expired (4,598 ) 11.65 (56,510 ) 11.17 Options outstanding and exercisable at end of period 520,662 7.96 888,070 8.72

RETIREMENT PLANS (Tables)

RETIREMENT PLANS (Tables)	6 Months Ended
	Jun. 30, 2018
Retirement Benefits [Abstract]
Schedule of Contribution Expense	Our contribution expense is presented in the following table: Six Months Ended (in thousands) 2018 2017 401(k) contribution expense $ 8,146 $ 6,150
Net Periodic Benefit Credit for Defined Benefit Plans	The net periodic benefit credit for these plans includes the following components: Three Months Ended Six Months Ended (in thousands) 2018 2017 2018 2017 Service cost $ (4 ) $ (4 ) $ (8 ) $ (8 ) Interest cost 1,560 1,477 3,120 2,954 Expected return on plan assets (2,895 ) (2,427 ) (5,790 ) (4,854 ) Amortization: Unrecognized prior service cost — 2 — 4 Unrecognized loss 623 628 1,246 1,256 Net periodic pension credit $ (716 ) $ (324 ) $ (1,432 ) $ (648 )

INCOME TAXES (Tables)

INCOME TAXES (Tables)	6 Months Ended
	Jun. 30, 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 Six Months Ended (in thousands) 2018 2017 2018 2017 Current income taxes: Federal taxes $ 5,749 $ 6,602 $ 23,449 $ 13,290 State taxes 1,045 1,086 2,749 1,585 Total current income taxes 6,794 7,688 26,198 14,875 Deferred income taxes: Federal taxes 13,256 22,460 15,158 24,150 State taxes 421 (531 ) 383 (2,924 ) Total deferred income taxes 13,677 21,929 15,541 21,226 Total income taxes $ 20,471 $ 29,617 $ 41,739 $ 36,101 Statutory tax rate 21.0 % 35.0 % 21.0 % 35.0 % Effective tax rate 19.4 % 28.5 % 19.5 % 27.0 %

OTHER COMPREHENSIVE INCOME (Tab

OTHER COMPREHENSIVE INCOME (Tables)	6 Months Ended
	Jun. 30, 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 Six Months Ended June 30, 2018 Balance at beginning of period $ (29,626 ) $ 5,407 $ (58,833 ) $ (83,052 ) Other comprehensive (loss) income before reclassifications (38,660 ) 5,600 972 (32,088 ) Amounts reclassified from AOCI (24 ) (721 ) — (745 ) Net current period other comprehensive (loss) income (38,684 ) 4,879 972 (32,833 ) Balance at end of period $ (68,310 ) $ 10,286 $ (57,861 ) $ (115,885 )

EARNINGS PER COMMON SHARE (Tabl

EARNINGS PER COMMON SHARE (Tables)	6 Months Ended
	Jun. 30, 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 Six Months Ended ( dollars in thousands, except per share data) 2018 2017 2018 2017 Net income $ 85,206 $ 74,406 $ 171,968 $ 97,385 Less: Preferred stock dividends 2,010 2,010 4,020 4,020 Net income available to common stockholders $ 83,196 $ 72,396 $ 167,948 $ 93,365 Basic weighted average common shares outstanding 324,170,177 323,303,460 323,956,752 280,578,720 Net effect of dilutive stock options, warrants and restricted stock 1,559,872 1,564,299 1,772,440 1,706,762 Diluted weighted average common shares outstanding 325,730,049 324,867,759 325,729,192 282,285,482 Earnings per common share: Basic $ 0.26 $ 0.22 $ 0.52 $ 0.33 Diluted $ 0.26 $ 0.22 $ 0.52 $ 0.33
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 Six Months Ended 2018 2017 2018 2017 Average shares excluded from the diluted earnings per common share calculation 72 1,266 46 8,107

CASH FLOW INFORMATION (Tables)

CASH FLOW INFORMATION (Tables)	6 Months Ended
	Jun. 30, 2018
Supplemental Cash Flow Elements [Abstract]
Summary of Supplemental Cash Flow Information	Following is a summary of supplemental cash flow information: Six Months Ended 2018 2017 (in thousands) Interest paid on deposits and other borrowings $ 98,926 $ 51,611 Income taxes paid 6,000 43,500 Transfers of loans to other real estate owned 7,967 22,451

BUSINESS SEGMENTS (Tables)

BUSINESS SEGMENTS (Tables)	6 Months Ended
	Jun. 30, 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 June 30, 2018 Interest income $ 284,768 $ — $ 19 $ 9,349 $ (19 ) $ 294,117 Interest expense 50,118 — — 885 3,759 54,762 Net interest income 234,650 — 19 8,464 (3,778 ) 239,355 Provision for credit losses 13,277 — — 2,277 — 15,554 Non-interest income 51,137 11,239 3,695 653 (1,835 ) 64,889 Non-interest expense (1) 159,675 8,694 3,895 5,293 1,645 179,202 Amortization of intangibles 3,699 60 52 — — 3,811 Income tax expense (benefit) 21,291 581 (43 ) 444 (1,802 ) 20,471 Net income (loss) 87,845 1,904 (190 ) 1,103 (5,456 ) 85,206 Total assets 32,034,457 25,152 22,114 167,678 8,162 32,257,563 Total intangibles 2,311,429 10,067 12,140 1,809 — 2,335,445 At or for the Three Months Ended June 30, 2017 Interest income $ 241,917 $ — $ 19 $ 10,114 $ (1,016 ) $ 251,034 Interest expense 28,414 — — 888 3,317 32,619 Net interest income 213,503 — 19 9,226 (4,333 ) 218,415 Provision for credit losses 14,738 — — 2,018 — 16,756 Non-interest income 53,031 9,821 3,496 770 (1,040 ) 66,078 Non-interest expense (1) 141,441 7,987 3,456 5,288 729 158,901 Amortization of intangibles 4,694 65 54 — — 4,813 Income tax expense (benefit) 30,200 651 10 1,073 (2,317 ) 29,617 Net income (loss) 75,461 1,118 (5 ) 1,617 (3,785 ) 74,406 Total assets 30,487,402 22,028 22,311 183,859 38,126 30,753,726 Total intangibles 2,322,326 10,288 12,231 1,809 — 2,346,654 (1) Excludes amortization of intangibles, which is presented separately. (in thousands) Community Banking Wealth Management Insurance Consumer Finance Parent and Other Consolidated At or for the Six Months Ended June 30, 2018 Interest income $ 548,355 $ — $ 39 $ 18,643 $ 7 $ 567,044 Interest expense 92,478 — — 1,795 7,311 101,584 Net interest income 455,877 — 39 16,848 (7,304 ) 465,460 Provision for credit losses 25,689 — — 4,360 — 30,049 Non-interest income 104,449 22,241 7,998 1,291 (3,587 ) 132,392 Non-interest expense (1) 308,342 16,972 7,606 10,523 2,624 346,067 Amortization of intangibles 7,804 121 104 — — 8,029 Income tax expense (benefit) 43,011 1,170 81 918 (3,441 ) 41,739 Net income (loss) 175,480 3,978 246 2,338 (10,074 ) 171,968 Total assets 32,034,457 25,152 22,114 167,678 8,162 32,257,563 Total intangibles 2,311,429 10,067 12,140 1,809 — 2,335,445 At or for the Six Months Ended June 30, 2017 Interest income $ 427,298 $ — $ 39 $ 20,016 $ (1,626 ) $ 445,727 Interest expense 47,279 — — 1,810 5,471 54,560 Net interest income 380,019 — 39 18,206 (7,097 ) 391,167 Provision for credit losses 23,802 — — 3,804 — 27,606 Non-interest income 93,748 19,370 7,821 1,480 (1,225 ) 121,194 Non-interest expense (1) 309,725 15,527 6,771 10,519 816 343,358 Amortization of intangibles 7,676 126 109 — — 7,911 Income tax expense (benefit) 36,511 1,362 357 2,140 (4,269 ) 36,101 Net income (loss) 96,053 2,355 623 3,223 (4,869 ) 97,385 Total assets 30,487,402 22,028 22,311 183,859 38,126 30,753,726 Total intangibles 2,322,326 10,288 12,231 1,809 — 2,346,654 (1) Excludes amortization of intangibles, which is presented separately.

FAIR VALUE MEASUREMENTS (Tables

FAIR VALUE MEASUREMENTS (Tables)	6 Months Ended
	Jun. 30, 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 June 30, 2018 Assets Measured at Fair Value Debt securities available for sale U.S. government agencies $ — $ 95,526 $ — $ 95,526 U.S. government-sponsored entities — 306,934 — 306,934 Residential mortgage-backed securities: Agency mortgage-backed securities — 1,577,596 — 1,577,596 Agency collateralized mortgage obligations — 831,817 — 831,817 Non-agency collateralized mortgage obligations — — — — Commercial mortgage-backed securities — 168,324 — 168,324 States of the U.S. and political subdivisions — 20,735 — 20,735 Other debt securities — 1,855 — 1,855 Total debt securities available for sale — 3,002,787 — 3,002,787 Loans held for sale — 28,213 — 28,213 Marketable equity securities Fixed income mutual fund 177 — — 177 Financial services industry — 995 — 995 Total marketable equity securities 177 995 — 1,172 Derivative financial instruments Trading — 19,004 — 19,004 Not for trading — 221 1,662 1,883 Total derivative financial instruments — 19,225 1,662 20,887 Total assets measured at fair value on a recurring basis $ 177 $ 3,051,220 $ 1,662 $ 3,053,059 Liabilities Measured at Fair Value Derivative financial instruments Trading $ — $ 61,728 $ — $ 61,728 Not for trading — 4,708 7 4,715 Total derivative financial instruments — 66,436 7 66,443 Total liabilities measured at fair value on a recurring basis $ — $ 66,436 $ 7 $ 66,443 (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 Six Months Ended June 30, 2018 Balance at beginning of period $ — $ — $ — $ 1,594 $ 1,594 Purchases, issuances, sales and settlements: Purchases — — — 1,662 1,662 Settlements — — — (1,594 ) (1,594 ) Balance at end of period $ — $ — $ — $ 1,662 $ 1,662 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 June 30, 2018 Impaired loans $ — $ 1,460 $ 6,135 $ 7,595 Other real estate owned — — 5,500 5,500 Other assets - SBA servicing asset — — 4,894 4,894 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 June 30, 2018 Financial Assets Cash and cash equivalents $ 433,699 $ 433,699 $ 433,699 $ — $ — Debt securities available for sale 3,002,787 3,002,787 — 3,002,787 — Debt securities held to maturity 3,295,081 3,181,275 — 3,181,275 — Net loans and leases, including loans held for sale 21,527,120 21,163,711 — 28,213 21,135,498 Loan servicing rights 37,864 43,497 — — 43,497 Marketable equity securities 1,172 1,172 177 995 — Derivative assets 20,887 20,887 — 19,225 1,662 Accrued interest receivable 93,210 93,210 93,210 — — Financial Liabilities Deposits 22,539,787 22,481,472 17,668,799 4,812,673 — Short-term borrowings 4,334,146 4,334,835 4,334,835 — — Long-term borrowings 628,938 624,104 — — 624,104 Derivative liabilities 66,443 66,443 — 66,436 7 Accrued interest payable 15,138 15,138 15,138 — — 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)	6 Months Ended
	Jun. 30, 2018OfficeState
Segment Reporting Information [Line Items]
Number of states, Company operating financial services | State	8
Number of banking offices	404
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	Jun. 30, 2018	Dec. 31, 2017
Accounting Policies [Abstract]
Net investment in LIHTCs	$ 27.3	$ 20.9
Qualified affordable housing project investments, commitment	$ 57	$ 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	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Debt Securities
Amortized Cost	$ 3,090,527
Gross Unrealized Gains	575
Gross Unrealized Losses	(88,315)
Fair Value	3,002,787
Equity Securities
Amortized Cost	3,090,527		$ 2,802,621
Gross Unrealized Gains			1,721
Gross Unrealized Losses			(39,780)
Securities available for sale	3,002,787		2,764,562
US Government Agencies [Member]
Debt Securities
Amortized Cost	96,085
Gross Unrealized Gains	0
Gross Unrealized Losses	(559)
Fair Value	95,526
U.S. Government-Sponsored Entities [Member]
Debt Securities
Amortized Cost	312,903		347,767
Gross Unrealized Gains	0	$ 52
Gross Unrealized Losses	(5,969)	(3,877)
Fair Value	306,934		343,942
Agency Mortgage-Backed Securities [Member]
Debt Securities
Amortized Cost	1,626,353		1,615,168
Gross Unrealized Gains	390	1,225
Gross Unrealized Losses	(49,147)	(17,519)
Fair Value	1,577,596		1,598,874
Equity Securities
Amortized Cost	1,626,353
Securities available for sale	1,577,596
Agency Collateralized Mortgage Obligations [Member]
Debt Securities
Amortized Cost	863,976		813,034
Gross Unrealized Gains	29	0
Gross Unrealized Losses	(32,188)	(18,077)
Fair Value	831,817		794,957
Equity Securities
Amortized Cost	863,976
Securities available for sale	831,817
Non-Agency Collateralized Mortgage Obligations [Member]
Debt Securities
Amortized Cost	0		1
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	0		1
Commercial Mortgage-Backed Securities [Member]
Debt Securities
Amortized Cost	168,466
Gross Unrealized Gains	154
Gross Unrealized Losses	(296)
Fair Value	168,324
Equity Securities
Amortized Cost	168,466
Securities available for sale	168,324
States of the U.S. and Political Subdivisions [Member]
Debt Securities
Amortized Cost	20,795		21,151
Gross Unrealized Gains	2	6
Gross Unrealized Losses	(62)	(64)
Fair Value	20,735		21,093
Other Debt Securities [Member]
Debt Securities
Amortized Cost	1,949		4,913
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(94)	(243)
Fair Value	$ 1,855		4,670
Debt Securities [Member]
Debt Securities
Amortized Cost			2,802,034
Gross Unrealized Gains		1,283
Gross Unrealized Losses		(39,780)
Fair Value			2,763,537
Equity Securities [Member]
Equity Securities
Amortized Cost			587
Gross Unrealized Gains		438
Gross Unrealized Losses		$ 0
Fair Value			$ 1,025

SECURITIES - Amortized Cost a50

SECURITIES - Amortized Cost and Fair Value of Securities Held to Maturity (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Investment Securities Held To Maturity [Line Items]
Amortized Cost	$ 3,295,081	$ 3,242,268
Gross Unrealized Gains	2,863	17,357
Gross Unrealized Losses	(116,669)	(41,246)
Fair Value	3,181,275	3,218,379
U.S. Treasury [Member]
Investment Securities Held To Maturity [Line Items]
Amortized Cost	500	500
Gross Unrealized Gains	107	134
Gross Unrealized Losses	0	0
Fair Value	607	634
US Government Agencies [Member]
Investment Securities Held To Maturity [Line Items]
Amortized Cost	2,056
Gross Unrealized Gains	60
Gross Unrealized Losses	0
Fair Value	2,116
U.S. Government-Sponsored Entities [Member]
Investment Securities Held To Maturity [Line Items]
Amortized Cost	245,017	247,310
Gross Unrealized Gains	0	93
Gross Unrealized Losses	(6,030)	(4,388)
Fair Value	238,987	243,015
Agency Mortgage-Backed Securities [Member]
Investment Securities Held To Maturity [Line Items]
Amortized Cost	1,125,947	1,219,802
Gross Unrealized Gains	295	3,475
Gross Unrealized Losses	(33,439)	(9,058)
Fair Value	1,092,803	1,214,219
Agency Collateralized Mortgage Obligations [Member]
Investment Securities Held To Maturity [Line Items]
Amortized Cost	840,073	777,146
Gross Unrealized Gains	768	32
Gross Unrealized Losses	(34,063)	(20,095)
Fair Value	806,778	757,083
Commercial Mortgage-Backed Securities [Member]
Investment Securities Held To Maturity [Line Items]
Amortized Cost	79,124	80,786
Gross Unrealized Gains	7	414
Gross Unrealized Losses	(1,555)	(575)
Fair Value	77,576	80,625
States of the U.S. and Political Subdivisions [Member]
Investment Securities Held To Maturity [Line Items]
Amortized Cost	1,002,364	916,724
Gross Unrealized Gains	1,626	13,209
Gross Unrealized Losses	(41,582)	(7,130)
Fair Value	$ 962,408	$ 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		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Investments, Debt and Equity Securities [Abstract]
Gross gains	$ 31	$ 611	$ 31	$ 4,011
Gross losses	0	(118)	0	(893)
Net gains	$ 31	$ 493	$ 31	$ 3,118

SECURITIES - Amortized Cost a52

SECURITIES - Amortized Cost and Fair Value of Securities, by Contractual Maturities (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Schedule Of Securities [Line Items]
Available for sale, due in one year or less, amortized cost	$ 65,485
Available for sale, due from one to five years, amortized cost	262,288
Available for sale, due from five to ten years, amortized cost	19,860
Available for sale, due after ten years, amortized cost	84,099
Available for sale, with contractual maturities, amortized cost	431,732
Total securities available for sale, amortized cost	3,090,527	$ 2,802,621
Available for sale, due in one year or less, fair value	65,271
Available for sale, due from one to five years, fair value	256,488
Available for sale, due from five to ten years, fair value	19,709
Available for sale, due after ten years, fair value	83,582
Available for sale, with contractual maturities, fair value	425,050
Total securities available for sale, fair value	3,002,787	2,764,562
Held to maturity, due in one year or less, amortized cost	55,457
Held to maturity, due from one to five years, amortized cost	201,924
Held to maturity, due from five to ten years, amortized cost	95,166
Held to maturity, due after ten years, amortized cost	897,390
Securities held to maturity, with contractual maturities, amortized cost	1,249,937
Held to maturity, with contractual maturities, amortized cost	3,295,081	3,242,268
Held to maturity, due in one year or less, fair value	55,236
Held to maturity, due from one to five years, fair value	196,157
Held to maturity, due from five to ten years, fair value	94,334
Held to maturity, due after ten years, fair value	858,391
Securities held to maturity, with contractual maturities, fair value	1,204,118
Held to maturity, with contractual maturities, fair value	3,181,275	3,218,379
Agency Mortgage-Backed Securities [Member]
Schedule Of Securities [Line Items]
Total securities available for sale, amortized cost	1,626,353
Total securities available for sale, fair value	1,577,596
Held to maturity, with contractual maturities, amortized cost	1,125,947	1,219,802
Held to maturity, with contractual maturities, fair value	1,092,803	1,214,219
Agency Collateralized Mortgage Obligations [Member]
Schedule Of Securities [Line Items]
Total securities available for sale, amortized cost	863,976
Total securities available for sale, fair value	831,817
Held to maturity, with contractual maturities, amortized cost	840,073	777,146
Held to maturity, with contractual maturities, fair value	806,778	757,083
Commercial Mortgage-Backed Securities [Member]
Schedule Of Securities [Line Items]
Total securities available for sale, amortized cost	168,466
Total securities available for sale, fair value	168,324
Held to maturity, with contractual maturities, amortized cost	79,124	80,786
Held to maturity, with contractual maturities, fair value	$ 77,576	$ 80,625

SECURITIES - Schedule of Securi

SECURITIES - Schedule of Securities Pledged as Collateral (Detail) - USD ($) $ in Thousands	Jun. 30, 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	$ 3,370,601	$ 3,491,634
Securities pledged (carrying value), as collateral for short-term borrowings	$ 261,140	$ 263,756
Securities pledged as a percent of total securities	57.70%	62.50%

SECURITIES - Fair Values and Un

SECURITIES - Fair Values and Unrealized Losses of Impaired Securities, by Length of Impairment (Detail) $ in Thousands	Jun. 30, 2018USD ($)Security	Dec. 31, 2017USD ($)Security
Schedule Of Securities [Line Items]
Number of available for sale securities, Less than 1 year | Security	103	71
Number of available for sale securities, Greater than 1 year | Security	75	75
Number of available for sale securities | Security	178	146
Securities available for sale, less than 12 months, fair value	$ 1,924,893	$ 1,503,806
Securities available for sale, less than 12 months, unrealized losses	(48,769)	(14,372)
Securities available for sale, 12 months or more, fair value	914,249	1,016,111
Securities available for sale, 12 months or more, unrealized losses	(39,546)	(25,408)
Securities available for sale, fair value, total	2,839,142	2,519,917
Securities available for sale, unrealized losses, total	$ (88,315)	$ (39,780)
Number of held to maturity securities | Security	380	168
Securities held to maturity, less than 12 months, fair value	$ 1,934,883	$ 1,061,703
Securities held to maturity, less than 12 months, unrealized losses	(59,182)	(7,851)
Securities held to maturity, greater than 12 months, fair value	901,853	984,076
Securities held to maturity, greater than 12 months, unrealized losses	(57,487)	(33,395)
Securities held to maturity, fair value, total	2,836,736	2,045,779
Securities held to maturity, unrealized losses, total	$ (116,669)	$ (41,246)
US Government Agencies [Member]
Schedule Of Securities [Line Items]
Number of available for sale securities, Less than 1 year | Security	13
Number of available for sale securities, Greater than 1 year | Security	0
Number of available for sale securities | Security	13
Securities available for sale, less than 12 months, fair value	$ 95,526
Securities available for sale, less than 12 months, unrealized losses	(559)
Securities available for sale, 12 months or more, fair value	0
Securities available for sale, 12 months or more, unrealized losses	0
Securities available for sale, fair value, total	95,526
Securities available for sale, unrealized losses, total	$ (559)
U.S. Government-Sponsored Entities [Member]
Schedule Of Securities [Line Items]
Number of available for sale securities, Less than 1 year | Security	5	7
Number of available for sale securities, Greater than 1 year | Security	10	10
Number of available for sale securities | Security	15	17
Securities available for sale, less than 12 months, fair value	$ 106,668	$ 106,809
Securities available for sale, less than 12 months, unrealized losses	(1,236)	(363)
Securities available for sale, 12 months or more, fair value	200,266	201,485
Securities available for sale, 12 months or more, unrealized losses	(4,733)	(3,514)
Securities available for sale, fair value, total	306,934	308,294
Securities available for sale, unrealized losses, total	$ (5,969)	$ (3,877)
Number of held to maturity securities | Security	14	14
Securities held to maturity, less than 12 months, fair value	$ 54,509	$ 54,790
Securities held to maturity, less than 12 months, unrealized losses	(508)	(239)
Securities held to maturity, greater than 12 months, fair value	184,478	185,851
Securities held to maturity, greater than 12 months, unrealized losses	(5,522)	(4,149)
Securities held to maturity, fair value, total	238,987	240,641
Securities held to maturity, unrealized losses, total	$ (6,030)	$ (4,388)
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	$ 1,145,743	$ 976,738
Securities available for sale, less than 12 months, unrealized losses	(30,600)	(7,723)
Securities available for sale, 12 months or more, fair value	418,672	473,625
Securities available for sale, 12 months or more, unrealized losses	(18,547)	(9,796)
Securities available for sale, fair value, total	1,564,415	1,450,363
Securities available for sale, unrealized losses, total	$ (49,147)	$ (17,519)
Number of held to maturity securities | Security	91	47
Securities held to maturity, less than 12 months, fair value	$ 909,762	$ 648,485
Securities held to maturity, less than 12 months, unrealized losses	(25,390)	(4,855)
Securities held to maturity, greater than 12 months, fair value	164,501	183,989
Securities held to maturity, greater than 12 months, unrealized losses	(8,049)	(4,203)
Securities held to maturity, fair value, total	1,074,263	832,474
Securities held to maturity, unrealized losses, total	$ (33,439)	$ (9,058)
Agency Collateralized Mortgage Obligations [Member]
Schedule Of Securities [Line Items]
Number of available for sale securities, Less than 1 year | Security	17	14
Number of available for sale securities, Greater than 1 year | Security	33	33
Number of available for sale securities | Security	50	47
Securities available for sale, less than 12 months, fair value	$ 491,313	$ 409,005
Securities available for sale, less than 12 months, unrealized losses	(16,023)	(6,231)
Securities available for sale, 12 months or more, fair value	292,579	335,452
Securities available for sale, 12 months or more, unrealized losses	(16,165)	(11,846)
Securities available for sale, fair value, total	783,892	744,457
Securities available for sale, unrealized losses, total	$ (32,188)	$ (18,077)
Number of held to maturity securities | Security	52	49
Securities held to maturity, less than 12 months, fair value	$ 299,575	$ 275,290
Securities held to maturity, less than 12 months, unrealized losses	(8,104)	(1,701)
Securities held to maturity, greater than 12 months, fair value	420,914	473,257
Securities held to maturity, greater than 12 months, unrealized losses	(25,959)	(18,394)
Securities held to maturity, fair value, total	720,489	748,547
Securities held to maturity, unrealized losses, total	$ (34,063)	$ (20,095)
Commercial Mortgage-Backed Securities [Member]
Schedule Of Securities [Line Items]
Number of available for sale securities, Less than 1 year | Security	2
Number of available for sale securities, Greater than 1 year | Security	0
Number of available for sale securities | Security	2
Securities available for sale, less than 12 months, fair value	$ 74,167
Securities available for sale, less than 12 months, unrealized losses	(296)
Securities available for sale, 12 months or more, fair value	0
Securities available for sale, 12 months or more, unrealized losses	0
Securities available for sale, fair value, total	74,167
Securities available for sale, unrealized losses, total	$ (296)
Number of held to maturity securities | Security	12	5
Securities held to maturity, less than 12 months, fair value	$ 54,920	$ 26,399
Securities held to maturity, less than 12 months, unrealized losses	(884)	(123)
Securities held to maturity, greater than 12 months, fair value	21,531	19,443
Securities held to maturity, greater than 12 months, unrealized losses	(671)	(452)
Securities held to maturity, fair value, total	76,451	45,842
Securities held to maturity, unrealized losses, total	$ (1,555)	$ (575)
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	$ 11,476	$ 11,254
Securities available for sale, less than 12 months, unrealized losses	(55)	(55)
Securities available for sale, 12 months or more, fair value	877	879
Securities available for sale, 12 months or more, unrealized losses	(7)	(9)
Securities available for sale, fair value, total	12,353	12,133
Securities available for sale, unrealized losses, total	$ (62)	$ (64)
Number of held to maturity securities | Security	211	53
Securities held to maturity, less than 12 months, fair value	$ 616,117	$ 56,739
Securities held to maturity, less than 12 months, unrealized losses	(24,296)	(933)
Securities held to maturity, greater than 12 months, fair value	110,429	121,536
Securities held to maturity, greater than 12 months, unrealized losses	(17,286)	(6,197)
Securities held to maturity, fair value, total	726,546	178,275
Securities held to maturity, unrealized losses, total	$ (41,582)	$ (7,130)
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	1,855	4,670
Securities available for sale, 12 months or more, unrealized losses	(94)	(243)
Securities available for sale, fair value, total	1,855	4,670
Securities available for sale, unrealized losses, total	$ (94)	$ (243)
Less Than Twelve Months [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities | Security	283	73
Less Than Twelve Months [Member] | U.S. Government-Sponsored Entities [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities | Security	4	4
Less Than Twelve Months [Member] | Agency Mortgage-Backed Securities [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities | Security	80	36
Less Than Twelve Months [Member] | Agency Collateralized Mortgage Obligations [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities | Security	17	14
Less Than Twelve Months [Member] | Commercial Mortgage-Backed Securities [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities | Security	8	3
Less Than Twelve Months [Member] | States of the U.S. and Political Subdivisions [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities | Security	174	16
Greater Than Twelve Months [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities | Security	97	95
Greater Than Twelve Months [Member] | U.S. Government-Sponsored Entities [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities | Security	10	10
Greater Than Twelve Months [Member] | Agency Mortgage-Backed Securities [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities | Security	11	11
Greater Than Twelve Months [Member] | Agency Collateralized Mortgage Obligations [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities | Security	35	35
Greater Than Twelve Months [Member] | Commercial Mortgage-Backed Securities [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities | Security	4	2
Greater Than Twelve Months [Member] | States of the U.S. and Political Subdivisions [Member]
Schedule Of Securities [Line Items]
Number of held to maturity securities | Security	37	37

SECURITIES - Additional Informa

SECURITIES - Additional Information (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Schedule Of Securities [Line Items]
Other than temporary impairment losses, investments, available-for-sale securities	$ 0	$ 0
Municipal bond portfolio, value	$ 1,000,000
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	$ 3,100
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	Jun. 30, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	$ 21,659,582	$ 20,998,766
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	8,834,322	8,741,864
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	4,301,387	4,170,667
Commercial Leases [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	337,397	266,720
Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	43,351	17,063
Total Commercial Loans and Leases [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	13,516,457	13,196,314
Direct Installment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	1,892,080	1,905,535
Residential Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	2,850,970	2,702,691
Indirect Installment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	1,746,509	1,448,433
Consumer Lines of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	1,653,566	1,745,793
Consumer Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	8,143,125	7,802,452
Originated Loans and Leases [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	16,885,181	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	5,754,367	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	3,797,773	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	337,397	266,720
Originated Loans and Leases [Member] | Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	43,351	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	9,932,888	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	1,772,090	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	2,297,558	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	1,746,352	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	1,136,293	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	6,952,293	6,391,677
Acquired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	4,774,401	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	3,079,955	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	503,614	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	3,583,569	4,242,501
Acquired Loans [Member] | Direct Installment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	119,990	149,822
Acquired Loans [Member] | Residential Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	553,412	666,465
Acquired Loans [Member] | Indirect Installment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	157	165
Acquired Loans [Member] | Consumer Lines of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	517,273	594,323
Acquired Loans [Member] | Consumer Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases, net of unearned income	$ 1,190,832	$ 1,410,775

LOANS AND LEASES - Commercial R

LOANS AND LEASES - Commercial Real Estate Loans (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Loans and Leases Receivable Disclosure [Line Items]
Commercial construction, acquisition and development loans	$ 1,176,326	$ 1,170,175
Credit Concentration Risk [Member] | Commercial Construction Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Percent of total loans and leases	5.40%	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	35.00%	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	65.00%	64.70%

LOANS AND LEASES - Outstanding

LOANS AND LEASES - Outstanding Principal Balance and Carrying Amount of Acquired Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount	$ 21,659,582	$ 20,998,766
Accounted for under ASC 310-30 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	4,387,378	5,176,015
Carrying amount	4,101,583	4,834,256
Accounted for under ASC 310-20 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	688,541	835,130
Carrying amount	668,859	812,322
Acquired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	5,075,919	6,011,145
Carrying amount	$ 4,770,442	$ 5,646,578

LOANS AND LEASES - Additional I

LOANS AND LEASES - Additional Information (Detail) - USD ($)	3 Months Ended	6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount	$ 21,659,582,000	$ 21,659,582,000		$ 20,998,766,000
Reclassification from non-accretable difference		$ 128,955,000	$ 40,304,000
Sustained period of delinquency for impairment evaluation		90 years
Valuation for impairment of loans with pooled reserves	500,000	$ 500,000
Minimum amount to allocate specific valuation allowance	500,000	500,000
Interest income on impaired loans		3,100,000	$ 2,600,000
Restructured loans returned to performing status		2,200,000
Minimum reserves for commercial loan	500,000	500,000
Pooled reserves for all other classes of loans		$ 4,200,000		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]
Proceeds from sale acquired real estate loans	56,500,000
Threshold period past due for default non-accrual status of trade accounts receivable		180 days
Carrying value of OREO through foreclosure	6,000,000	$ 6,000,000		3,600,000
Mortgage loans on real estate, foreclosure		12,500,000		15,200,000
Purchased Credit-Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying amount	$ 1,700,000	$ 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		0.04%

LOANS AND LEASES - Change in Ac

LOANS AND LEASES - Change in Accretable Yield of Acquired Loans (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 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	444,715
Reduction due to unexpected early payoffs	(94,456)	(61,093)
Reclass from non-accretable difference	128,955	40,304
Disposals/transfers	(408)	(324)
Other	(1,619)	0
Accretion	(116,006)	(100,628)
Balance at end of period	$ 624,947	$ 790,044

LOANS AND LEASES - Non-Performi

LOANS AND LEASES - Non-Performing Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled debt restructurings	$ 53,714	$ 53,991
Non-Performing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans	68,696	74,635
Troubled debt restructurings	24,820	23,481
Total non-performing loans	93,516	98,116
Other real estate owned	39,240	40,606
Total non-performing assets	$ 132,756	$ 138,722
Non-performing loans / total loans and leases	0.43%	0.47%
Non-performing loans OREO / total loans and leases OREO	0.61%	0.66%
Non-performing assets / total assets	0.41%	0.44%

LOANS AND LEASES - Age Analysis

LOANS AND LEASES - Age Analysis of Past Due Loans (Detail) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	$ 21,659,582	$ 20,998,766
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	8,834,322	8,741,864
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	4,301,387	4,170,667
Commercial Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	337,397	266,720
Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	43,351	17,063
Total Commercial Loans and Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	13,516,457	13,196,314
Direct Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	1,892,080	1,905,535
Residential Mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	2,850,970	2,702,691
Indirect Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	1,746,509	1,448,433
Consumer Lines of Credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	1,653,566	1,745,793
Consumer Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	8,143,125	7,802,452
Originated Loans and Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	115,485	134,911
Non- Accrual	59,953	63,644
Current	16,769,696	15,210,579
Total Loans	16,885,181	15,345,490
Loans sold	14,700
Originated Loans and Leases [Member] | 30-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	48,305	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	7,227	9,121
Originated Loans and Leases [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	25,130	33,047
Non- Accrual	14,652	24,773
Current	5,729,237	5,141,736
Total Loans	5,754,367	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	10,476	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	2	1
Originated Loans and Leases [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	29,033	26,028
Non- Accrual	23,367	17,077
Current	3,768,740	3,469,219
Total Loans	3,797,773	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	5,663	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	2,079	2,997
Non- Accrual	1,218	1,574
Current	335,318	263,723
Total Loans	337,397	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	861	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	1,367	1,236
Non- Accrual	1,000	1,000
Current	41,984	15,827
Total Loans	43,351	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	163	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	204	153
Originated Loans and Leases [Member] | Total Commercial Loans and Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	57,609	63,308
Non- Accrual	40,237	44,424
Current	9,875,279	8,890,505
Total Loans	9,932,888	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	17,163	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	209	198
Originated Loans and Leases [Member] | Direct Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	20,747	26,554
Non- Accrual	7,402	8,896
Current	1,751,343	1,729,159
Total Loans	1,772,090	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	9,317	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	4,028	4,466
Originated Loans and Leases [Member] | Residential Mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	18,524	22,699
Non- Accrual	6,882	5,771
Current	2,279,034	2,013,527
Total Loans	2,297,558	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	10,046	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	1,596	2,832
Originated Loans and Leases [Member] | Indirect Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	10,099	13,164
Non- Accrual	2,152	2,240
Current	1,736,253	1,435,104
Total Loans	1,746,352	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	7,592	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	355	611
Originated Loans and Leases [Member] | Consumer Lines of Credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	8,506	9,186
Non- Accrual	3,280	2,313
Current	1,127,787	1,142,284
Total Loans	1,136,293	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	4,187	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	1,039	1,014
Originated Loans and Leases [Member] | Consumer Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	57,876	71,603
Non- Accrual	19,716	19,220
Current	6,894,417	6,320,074
Total Loans	6,952,293	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	31,142	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	7,018	8,923
Acquired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	120,106	167,867
Non- Accrual	8,743	10,991
Current	4,894,298	5,768,610
(Discount) Premium	(240,003)	(283,201)
Total Loans	4,774,401	5,653,276
Loans sold	28,500
Acquired Loans [Member] | 30-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	43,474	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	67,889	89,950
Acquired Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	77,293	101,995
Non- Accrual	3,231	3,975
Current	3,181,557	3,657,152
(Discount) Premium	(178,895)	(192,066)
Total Loans	3,079,955	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	20,622	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	53,440	63,092
Acquired Loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	9,465	15,302
Non- Accrual	4,347	5,663
Current	526,830	698,265
(Discount) Premium	(32,681)	(38,147)
Total Loans	503,614	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	1,620	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	3,498	6,452
Acquired Loans [Member] | Commercial Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	86,758	117,297
Non- Accrual	7,578	9,638
Current	3,708,387	4,355,417
(Discount) Premium	(211,576)	(230,213)
Total Loans	3,583,569	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	22,242	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	56,938	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	3,583,569	4,242,501
Acquired Loans [Member] | Direct Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	4,897	7,280
Non- Accrual	0	0
Current	115,496	141,386
(Discount) Premium	(403)	1,156
Total Loans	119,990	149,822
Acquired Loans [Member] | Direct Installment [Member] | 30-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	3,766	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	1,131	2,013
Acquired Loans [Member] | Residential Mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	18,121	32,330
Non- Accrual	0	0
Current	552,387	675,499
(Discount) Premium	(17,096)	(41,364)
Total Loans	553,412	666,465
Acquired Loans [Member] | Residential Mortgages [Member] | 30-89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	10,424	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	7,697	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	1	10
(Discount) Premium	155	154
Total Loans	157	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	10,329	10,959
Non- Accrual	1,165	1,353
Current	518,027	596,298
(Discount) Premium	(11,083)	(12,934)
Total Loans	517,273	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	7,042	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	2,122	3,253
Acquired Loans [Member] | Consumer Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	33,348	50,570
Non- Accrual	1,165	1,353
Current	1,185,911	1,413,193
(Discount) Premium	(28,427)	(52,988)
Total Loans	1,190,832	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	21,232	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	$ 10,951	$ 20,406

LOANS AND LEASES - Commercial L

LOANS AND LEASES - Commercial Loans and Leases by Credit Quality (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	$ 21,659,582	$ 20,998,766
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	8,834,322	8,741,864
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	4,301,387	4,170,667
Commercial Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	337,397	266,720
Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	43,351	17,063
Total Commercial Loans and Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	13,516,457	13,196,314
Originated Loans and Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	16,885,181	15,345,490
Originated Loans and Leases [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	5,754,367	5,174,783
Originated Loans and Leases [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	3,797,773	3,495,247
Originated Loans and Leases [Member] | Commercial Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	337,397	266,720
Originated Loans and Leases [Member] | Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	43,351	17,063
Originated Loans and Leases [Member] | Total Commercial Loans and Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	9,932,888	8,953,813
Acquired Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	4,774,401	5,653,276
Acquired Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	3,079,955	3,567,081
Acquired Loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	503,614	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	3,583,569	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	5,499,238	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	3,537,536	3,266,966
Pass [Member] | Originated Loans and Leases [Member] | Commercial Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	326,574	260,235
Pass [Member] | Originated Loans and Leases [Member] | Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	42,037	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	9,405,385	8,465,939
Pass [Member] | Acquired Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	2,661,433	3,102,788
Pass [Member] | Acquired Loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	434,731	603,611
Pass [Member] | Acquired Loans [Member] | Total Commercial Loans and Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	3,096,164	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	131,806	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	176,599	132,975
Special Mention [Member] | Originated Loans and Leases [Member] | Commercial Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	2,274	4,425
Special Mention [Member] | Originated Loans and Leases [Member] | Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	110	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	310,789	290,187
Special Mention [Member] | Acquired Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	200,723	250,987
Special Mention [Member] | Acquired Loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	26,981	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	227,704	277,046
Substandard [Member] | Originated Loans and Leases [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	123,297	98,728
Substandard [Member] | Originated Loans and Leases [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	79,246	92,091
Substandard [Member] | Originated Loans and Leases [Member] | Commercial Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	8,549	2,060
Substandard [Member] | Originated Loans and Leases [Member] | Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	1,204	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	212,296	194,033
Substandard [Member] | Acquired Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	217,626	213,089
Substandard [Member] | Acquired Loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	41,902	45,661
Substandard [Member] | Acquired Loans [Member] | Total Commercial Loans and Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	259,528	258,750
Doubtful [Member] | Originated Loans and Leases [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	26	439
Doubtful [Member] | Originated Loans and Leases [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	4,392	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	4,418	3,654
Doubtful [Member] | Acquired Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	173	217
Doubtful [Member] | Acquired Loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	0	89
Doubtful [Member] | Acquired Loans [Member] | Total Commercial Loans and Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total commercial loans and leases	$ 173	$ 306

LOANS AND LEASES - Consumer Loa

LOANS AND LEASES - Consumer Loans by Payment Status (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Credit Quality [Line Items]
Carrying amount	$ 21,659,582	$ 20,998,766
Direct Installment [Member]
Credit Quality [Line Items]
Carrying amount	1,892,080	1,905,535
Residential Mortgages [Member]
Credit Quality [Line Items]
Carrying amount	2,850,970	2,702,691
Indirect Installment [Member]
Credit Quality [Line Items]
Carrying amount	1,746,509	1,448,433
Originated Loans and Leases [Member]
Credit Quality [Line Items]
Carrying amount	16,885,181	15,345,490
Originated Loans and Leases [Member] | Direct Installment [Member]
Credit Quality [Line Items]
Carrying amount	1,772,090	1,755,713
Originated Loans and Leases [Member] | Residential Mortgages [Member]
Credit Quality [Line Items]
Carrying amount	2,297,558	2,036,226
Originated Loans and Leases [Member] | Indirect Installment [Member]
Credit Quality [Line Items]
Carrying amount	1,746,352	1,448,268
Acquired Loans [Member]
Credit Quality [Line Items]
Carrying amount	4,774,401	5,653,276
Acquired Loans [Member] | Direct Installment [Member]
Credit Quality [Line Items]
Carrying amount	119,990	149,822
Acquired Loans [Member] | Residential Mortgages [Member]
Credit Quality [Line Items]
Carrying amount	553,412	666,465
Acquired Loans [Member] | Indirect Installment [Member]
Credit Quality [Line Items]
Carrying amount	157	165
Consumer Loan [Member] | Originated Loans and Leases [Member]
Credit Quality [Line Items]
Carrying amount	6,952,293	6,391,677
Consumer Loan [Member] | Originated Loans and Leases [Member] | Performing [Member]
Credit Quality [Line Items]
Carrying amount	6,911,416	6,352,285
Consumer Loan [Member] | Originated Loans and Leases [Member] | Non-Performing [Member]
Credit Quality [Line Items]
Carrying amount	40,877	39,392
Consumer Loan [Member] | Originated Loans and Leases [Member] | Direct Installment [Member]
Credit Quality [Line Items]
Carrying amount	1,772,090	1,755,713
Consumer Loan [Member] | Originated Loans and Leases [Member] | Direct Installment [Member] | Performing [Member]
Credit Quality [Line Items]
Carrying amount	1,756,297	1,739,060
Consumer Loan [Member] | Originated Loans and Leases [Member] | Direct Installment [Member] | Non-Performing [Member]
Credit Quality [Line Items]
Carrying amount	15,793	16,653
Consumer Loan [Member] | Originated Loans and Leases [Member] | Residential Mortgages [Member]
Credit Quality [Line Items]
Carrying amount	2,297,558	2,036,226
Consumer Loan [Member] | Originated Loans and Leases [Member] | Residential Mortgages [Member] | Performing [Member]
Credit Quality [Line Items]
Carrying amount	2,279,790	2,019,816
Consumer Loan [Member] | Originated Loans and Leases [Member] | Residential Mortgages [Member] | Non-Performing [Member]
Credit Quality [Line Items]
Carrying amount	17,768	16,410
Consumer Loan [Member] | Originated Loans and Leases [Member] | Indirect Installment [Member]
Credit Quality [Line Items]
Carrying amount	1,746,352	1,448,268
Consumer Loan [Member] | Originated Loans and Leases [Member] | Indirect Installment [Member] | Performing [Member]
Credit Quality [Line Items]
Carrying amount	1,744,007	1,445,833
Consumer Loan [Member] | Originated Loans and Leases [Member] | Indirect Installment [Member] | Non-Performing [Member]
Credit Quality [Line Items]
Carrying amount	2,345	2,435
Consumer Loan [Member] | Originated Loans and Leases [Member] | Consumer Lines of Credit [Member]
Credit Quality [Line Items]
Carrying amount	1,136,293	1,151,470
Consumer Loan [Member] | Originated Loans and Leases [Member] | Consumer Lines of Credit [Member] | Performing [Member]
Credit Quality [Line Items]
Carrying amount	1,131,322	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	4,971	3,894
Consumer Loan [Member] | Acquired Loans [Member]
Credit Quality [Line Items]
Carrying amount	1,190,832	1,410,775
Consumer Loan [Member] | Acquired Loans [Member] | Performing [Member]
Credit Quality [Line Items]
Carrying amount	1,189,149	1,408,765
Consumer Loan [Member] | Acquired Loans [Member] | Non-Performing [Member]
Credit Quality [Line Items]
Carrying amount	1,683	2,010
Consumer Loan [Member] | Acquired Loans [Member] | Direct Installment [Member]
Credit Quality [Line Items]
Carrying amount	119,990	149,822
Consumer Loan [Member] | Acquired Loans [Member] | Direct Installment [Member] | Performing [Member]
Credit Quality [Line Items]
Carrying amount	119,921	149,751
Consumer Loan [Member] | Acquired Loans [Member] | Direct Installment [Member] | Non-Performing [Member]
Credit Quality [Line Items]
Carrying amount	69	71
Consumer Loan [Member] | Acquired Loans [Member] | Residential Mortgages [Member]
Credit Quality [Line Items]
Carrying amount	553,412	666,465
Consumer Loan [Member] | Acquired Loans [Member] | Residential Mortgages [Member] | Performing [Member]
Credit Quality [Line Items]
Carrying amount	553,412	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	157	165
Consumer Loan [Member] | Acquired Loans [Member] | Indirect Installment [Member] | Performing [Member]
Credit Quality [Line Items]
Carrying amount	157	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	517,273	594,323
Consumer Loan [Member] | Acquired Loans [Member] | Consumer Lines of Credit [Member] | Performing [Member]
Credit Quality [Line Items]
Carrying amount	515,659	592,384
Consumer Loan [Member] | Acquired Loans [Member] | Consumer Lines of Credit [Member] | Non-Performing [Member]
Credit Quality [Line Items]
Carrying amount	$ 1,614	$ 1,939

LOANS AND LEASES - Impaired Loa

LOANS AND LEASES - Impaired Loans and Lease (Detail) - Originated Loans and Leases [Member] - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	$ 95,481	$ 106,476
Recorded Investment With No Specific Reserve	69,423	74,309
Recorded Investment With Specific Reserve	10,988	7,363
Total Recorded Investment	80,411	81,672
Specific Reserve	4,418	3,654
Average Recorded Investment	85,703	88,636
Commercial Real Estate [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	16,428	27,718
Recorded Investment With No Specific Reserve	14,308	21,748
Recorded Investment With Specific Reserve	201	2,906
Total Recorded Investment	14,509	24,654
Specific Reserve	26	439
Average Recorded Investment	20,912	24,413
Commercial and Industrial [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	28,738	29,307
Recorded Investment With No Specific Reserve	13,020	11,595
Recorded Investment With Specific Reserve	10,787	4,457
Total Recorded Investment	23,807	16,052
Specific Reserve	4,392	3,215
Average Recorded Investment	23,688	23,907
Commercial Leases [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	1,218	1,574
Recorded Investment With No Specific Reserve	1,218	1,574
Recorded Investment With Specific Reserve	0	0
Total Recorded Investment	1,218	1,574
Specific Reserve	0	0
Average Recorded Investment	1,309	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	46,384	58,599
Recorded Investment With No Specific Reserve	28,546	34,917
Recorded Investment With Specific Reserve	10,988	7,363
Total Recorded Investment	39,534	42,280
Specific Reserve	4,418	3,654
Average Recorded Investment	45,909	49,706
Direct Installment [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	18,603	19,375
Recorded Investment With No Specific Reserve	15,793	16,653
Recorded Investment With Specific Reserve	0	0
Total Recorded Investment	15,793	16,653
Specific Reserve	0	0
Average Recorded Investment	15,693	16,852
Residential Mortgages [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	19,180	17,754
Recorded Investment With No Specific Reserve	17,768	16,410
Recorded Investment With Specific Reserve	0	0
Total Recorded Investment	17,768	16,410
Specific Reserve	0	0
Average Recorded Investment	16,973	15,984
Indirect Installment [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	4,579	5,709
Recorded Investment With No Specific Reserve	2,345	2,435
Recorded Investment With Specific Reserve	0	0
Total Recorded Investment	2,345	2,435
Specific Reserve	0	0
Average Recorded Investment	2,387	2,279
Consumer Lines of Credit [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	6,735	5,039
Recorded Investment With No Specific Reserve	4,971	3,894
Recorded Investment With Specific Reserve	0	0
Total Recorded Investment	4,971	3,894
Specific Reserve	0	0
Average Recorded Investment	4,741	3,815
Consumer Loan [Member]
Financial Receivables Impaired Or Restructured [Line Items]
Unpaid Contractual Principal Balance	49,097	47,877
Recorded Investment With No Specific Reserve	40,877	39,392
Recorded Investment With Specific Reserve	0	0
Total Recorded Investment	40,877	39,392
Specific Reserve	0	0
Average Recorded Investment	$ 39,794	$ 38,930

LOANS AND LEASES - Additional A

LOANS AND LEASES - Additional Allowance for Credit Losses Relating to Acquired Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Total allowance on acquired loans	$ 176,574	$ 179,247	$ 175,380	$ 165,699	$ 160,782	$ 158,059
Acquired Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total allowance on acquired loans	3,959	$ 6,837	6,698	$ 6,607	$ 6,568	$ 7,268
Acquired Loans [Member] | Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total allowance on acquired loans	2,892		4,976
Acquired Loans [Member] | Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total allowance on acquired loans	78		(415)
Acquired Loans [Member] | Total Commercial Loans and Leases [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total allowance on acquired loans	2,970		4,561
Acquired Loans [Member] | Direct Installment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total allowance on acquired loans	562		1,553
Acquired Loans [Member] | Residential Mortgages [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total allowance on acquired loans	191		484
Acquired Loans [Member] | Indirect Installment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total allowance on acquired loans	250		177
Acquired Loans [Member] | Consumer Lines of Credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total allowance on acquired loans	(14)		(77)
Acquired Loans [Member] | Consumer Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total allowance on acquired loans	$ 989		$ 2,137

LOANS AND LEASES - Summary of P

LOANS AND LEASES - Summary of Payment Status of TDRs (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings ("TDRs")	$ 53,714	$ 53,991
Originated Loans and Leases [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings ("TDRs")	50,364	50,183
Acquired Loans [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings ("TDRs")	3,350	3,808
Performing [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings ("TDRs")	19,520	19,804
Performing [Member] | Originated Loans and Leases [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings ("TDRs")	19,352	19,538
Performing [Member] | Acquired Loans [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings ("TDRs")	168	266
Non-Performing [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings ("TDRs")	24,820	23,481
Non-Performing [Member] | Originated Loans and Leases [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings ("TDRs")	21,689	20,173
Non-Performing [Member] | Acquired Loans [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings ("TDRs")	3,131	3,308
Non-Accrual [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings ("TDRs")	9,374	10,706
Non-Accrual [Member] | Originated Loans and Leases [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings ("TDRs")	9,323	10,472
Non-Accrual [Member] | Acquired Loans [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings ("TDRs")	$ 51	$ 234

LOANS AND LEASES - Reserve for

LOANS AND LEASES - Reserve for Commercial TDRs Included in Allowance for Credit Losses (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016
Financing Receivable, Modifications [Line Items]
Total allowance on acquired loans	$ 176,574	$ 179,247	$ 175,380	$ 165,699	$ 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	14		95
Pooled Reserves for Individual Commercial Loans [Member] | Total Commercial Loans and Leases [Member]
Financing Receivable, Modifications [Line Items]
Total allowance on acquired loans	$ 529		$ 469

LOANS AND LEASES - Troubled Deb

LOANS AND LEASES - Troubled Debt Restructurings (Detail) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018USD ($)Contract	Jun. 30, 2017USD ($)Contract	Jun. 30, 2018USD ($)Contract	Jun. 30, 2017USD ($)Contract
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	229	199	447	405
Pre- Modification Outstanding Recorded Investment	$ 4,056	$ 6,680	$ 7,593	$ 8,743
Post- Modification Outstanding Recorded Investment	$ 3,785	$ 6,535	$ 6,050	$ 8,887
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	1	1	1	2
Pre- Modification Outstanding Recorded Investment	$ 125	$ 463	$ 125	$ 595
Post- Modification Outstanding Recorded Investment	$ 122	$ 463	$ 122	$ 566
Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	13	2	13	2
Pre- Modification Outstanding Recorded Investment	$ 862	$ 4,038	$ 2,524	$ 3,542
Post- Modification Outstanding Recorded Investment	$ 780	$ 4,204	$ 1,384	$ 4,204
Total Commercial Loans and Leases [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	14	3	14	4
Pre- Modification Outstanding Recorded Investment	$ 987	$ 4,501	$ 2,649	$ 4,137
Post- Modification Outstanding Recorded Investment	$ 902	$ 4,667	$ 1,506	$ 4,770
Direct Installment [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	178	162	357	333
Pre- Modification Outstanding Recorded Investment	$ 2,372	$ 1,448	$ 3,404	$ 2,951
Post- Modification Outstanding Recorded Investment	$ 2,276	$ 1,301	$ 3,209	$ 2,688
Residential Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	8	9	19	16
Pre- Modification Outstanding Recorded Investment	$ 304	$ 405	$ 807	$ 570
Post- Modification Outstanding Recorded Investment	$ 298	$ 345	$ 799	$ 497
Indirect Installment [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	7	4	16	9
Pre- Modification Outstanding Recorded Investment	$ 11	$ 15	$ 24	$ 31
Post- Modification Outstanding Recorded Investment	$ 11	$ 14	$ 23	$ 27
Consumer Lines of Credit [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	22	21	41	43
Pre- Modification Outstanding Recorded Investment	$ 382	$ 311	$ 709	$ 1,054
Post- Modification Outstanding Recorded Investment	$ 298	$ 208	$ 513	$ 905
Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	215	196	433	401
Pre- Modification Outstanding Recorded Investment	$ 3,069	$ 2,179	$ 4,944	$ 4,606
Post- Modification Outstanding Recorded Investment	$ 2,883	$ 1,868	$ 4,544	$ 4,117

LOANS AND LEASES - Originated T

LOANS AND LEASES - Originated Troubled Debt Restructurings, Payment Default (Detail) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018USD ($)Contract	Jun. 30, 2017USD ($)Contract	Jun. 30, 2018USD ($)Contract	Jun. 30, 2017USD ($)Contract
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	51	41	96	73
Recorded Investment | $	$ 414	$ 608	$ 864	$ 818
Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract		2		3
Recorded Investment | $		$ 312		$ 326
Total Commercial Loans and Leases [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract		2		3
Recorded Investment | $		$ 312		$ 326
Direct Installment [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	41	31	78	55
Recorded Investment | $	$ 202	$ 134	$ 304	$ 146
Residential Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	3	1	6	4
Recorded Investment | $	$ 146	$ 80	$ 293	$ 264
Indirect Installment [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	5	6	9	10
Recorded Investment | $	$ 10	$ 19	$ 15	$ 19
Consumer Lines of Credit [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	2	1	3	1
Recorded Investment | $	$ 56	$ 63	$ 252	$ 63
Consumer Loan [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Contract	51	39	96	70
Recorded Investment | $	$ 414	$ 296	$ 864	$ 492

ALLOWANCE FOR CREDIT LOSSES - C

ALLOWANCE FOR CREDIT LOSSES - Changes in Allowance for Credit Losses (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	$ 179,247	$ 160,782	$ 175,380	$ 158,059
Charge- Offs	(22,630)	(15,134)	(36,541)	(26,428)
Recoveries	4,403	3,295	7,686	6,462
Net Charge- Offs	(18,227)	(11,839)	(28,855)	(19,966)
Provision for credit losses	15,554	16,756	30,049	27,606
Balance at End of Period	176,574	165,699	176,574	165,699
Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	172,410	154,214	168,682	150,791
Charge- Offs	(18,554)	(15,059)	(32,156)	(25,871)
Recoveries	3,723	2,399	6,283	5,297
Net Charge- Offs	(14,831)	(12,660)	(25,873)	(20,574)
Provision for credit losses	15,036	17,538	29,806	28,875
Balance at End of Period	172,615	159,092	172,615	159,092
Acquired Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	6,837	6,568	6,698	7,268
Charge- Offs	(4,076)	(75)	(4,385)	(557)
Recoveries	680	896	1,403	1,165
Net Charge- Offs	(3,396)	821	(2,982)	608
Provision for credit losses	518	(782)	243	(1,269)
Balance at End of Period	3,959	6,607	3,959	6,607
Commercial Real Estate [Member] | Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	53,516	46,389	50,281	46,635
Charge- Offs	(4,254)	(318)	(4,479)	(1,306)
Recoveries	765	505	1,102	866
Net Charge- Offs	(3,489)	187	(3,377)	(440)
Provision for credit losses	560	382	3,683	763
Balance at End of Period	50,587	46,958	50,587	46,958
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	2,892		2,892
Commercial and Industrial [Member] | Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	53,013	53,570	51,963	47,991
Charge- Offs	(6,127)	(7,736)	(12,047)	(10,199)
Recoveries	1,157	183	1,526	657
Net Charge- Offs	(4,970)	(7,553)	(10,521)	(9,542)
Provision for credit losses	5,646	8,091	12,247	15,659
Balance at End of Period	53,689	54,108	53,689	54,108
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	78		78
Commercial Leases [Member] | Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	6,115	3,513	5,646	3,280
Charge- Offs	(36)	(208)	(207)	(714)
Recoveries	14	3	24	4
Net Charge- Offs	(22)	(205)	(183)	(710)
Provision for credit losses	946	814	1,576	1,552
Balance at End of Period	7,039	4,122	7,039	4,122
Other [Member] | Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	1,995	1,809	1,843	1,392
Charge- Offs	(1,578)	(821)	(2,375)	(1,794)
Recoveries	272	353	569	680
Net Charge- Offs	(1,306)	(468)	(1,806)	(1,114)
Provision for credit losses	1,307	497	1,959	1,560
Balance at End of Period	1,996	1,838	1,996	1,838
Total Commercial Loans and Leases [Member] | Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	114,639	105,281	109,733	99,298
Charge- Offs	(11,995)	(9,083)	(19,108)	(14,013)
Recoveries	2,208	1,044	3,221	2,207
Net Charge- Offs	(9,787)	(8,039)	(15,887)	(11,806)
Provision for credit losses	8,459	9,784	19,465	19,534
Balance at End of Period	113,311	107,026	113,311	107,026
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	2,970		2,970
Direct Installment [Member] | Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	20,128	20,210	20,936	21,391
Charge- Offs	(2,922)	(3,245)	(6,392)	(6,119)
Recoveries	463	581	903	1,209
Net Charge- Offs	(2,459)	(2,664)	(5,489)	(4,910)
Provision for credit losses	2,610	3,190	4,832	4,255
Balance at End of Period	20,279	20,736	20,279	20,736
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	562		562
Residential Mortgages [Member] | Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	15,280	10,210	15,507	10,082
Charge- Offs	(314)	(182)	(393)	(362)
Recoveries	16	10	107	171
Net Charge- Offs	(298)	(172)	(286)	(191)
Provision for credit losses	181	1,214	(58)	1,361
Balance at End of Period	15,163	11,252	15,163	11,252
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	191		191
Indirect Installment [Member] | Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	11,955	9,630	11,967	10,564
Charge- Offs	(2,218)	(1,966)	(4,627)	(4,336)
Recoveries	974	614	1,869	1,395
Net Charge- Offs	(1,244)	(1,352)	(2,758)	(2,941)
Provision for credit losses	2,690	2,296	4,192	2,951
Balance at End of Period	13,401	10,574	13,401	10,574
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	250		250
Consumer Lines of Credit [Member] | Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	10,408	8,883	10,539	9,456
Charge- Offs	(1,105)	(583)	(1,636)	(1,041)
Recoveries	62	150	183	315
Net Charge- Offs	(1,043)	(433)	(1,453)	(726)
Provision for credit losses	1,096	1,054	1,375	774
Balance at End of Period	10,461	9,504	10,461	9,504
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	(14)		(14)
Consumer Loan [Member] | Originated Loans and Leases [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	57,771	48,933	58,949	51,493
Charge- Offs	(6,559)	(5,976)	(13,048)	(11,858)
Recoveries	1,515	1,355	3,062	3,090
Net Charge- Offs	(5,044)	(4,621)	(9,986)	(8,768)
Provision for credit losses	6,577	7,754	10,341	9,341
Balance at End of Period	59,304	52,066	59,304	52,066
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	989		989
Purchased Credit-Impaired Loans [Member] | Acquired Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	622	660	635	572
Charge- Offs	0	(1)	0	(1)
Recoveries	0	0	0	0
Net Charge- Offs	0	(1)	0	(1)
Provision for credit losses	2	(19)	(11)	69
Balance at End of Period	624	640	624	640
Other Acquired Loans [Member] | Acquired Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at Beginning of Period	6,215	5,908	6,063	6,696
Charge- Offs	(4,076)	(74)	(4,385)	(556)
Recoveries	680	896	1,403	1,165
Net Charge- Offs	(3,396)	822	(2,982)	609
Provision for credit losses	516	(763)	254	(1,338)
Balance at End of Period	$ 3,335	$ 5,967	$ 3,335	$ 5,967

ALLOWANCE FOR CREDIT LOSSES - I

ALLOWANCE FOR CREDIT LOSSES - Individual and Collective Allowance for Credit Losses (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Valuation Allowance [Line Items]
Originated loans and leases outstanding, loans and leases	$ 21,659,582	$ 20,998,766
Commercial Real Estate [Member]
Valuation Allowance [Line Items]
Originated loans and leases outstanding, loans and leases	8,834,322	8,741,864
Commercial and Industrial [Member]
Valuation Allowance [Line Items]
Originated loans and leases outstanding, loans and leases	4,301,387	4,170,667
Commercial Leases [Member]
Valuation Allowance [Line Items]
Originated loans and leases outstanding, loans and leases	337,397	266,720
Other [Member]
Valuation Allowance [Line Items]
Originated loans and leases outstanding, loans and leases	43,351	17,063
Total Commercial Loans and Leases [Member]
Valuation Allowance [Line Items]
Originated loans and leases outstanding, loans and leases	13,516,457	13,196,314
Direct Installment [Member]
Valuation Allowance [Line Items]
Originated loans and leases outstanding, loans and leases	1,892,080	1,905,535
Residential Mortgages [Member]
Valuation Allowance [Line Items]
Originated loans and leases outstanding, loans and leases	2,850,970	2,702,691
Indirect Installment [Member]
Valuation Allowance [Line Items]
Originated loans and leases outstanding, loans and leases	1,746,509	1,448,433
Consumer Lines of Credit [Member]
Valuation Allowance [Line Items]
Originated loans and leases outstanding, loans and leases	1,653,566	1,745,793
Consumer Loan [Member]
Valuation Allowance [Line Items]
Originated loans and leases outstanding, loans and leases	8,143,125	7,802,452
Originated Loans and Leases [Member]
Valuation Allowance [Line Items]
Originated allowance, individually evaluated for impairment	4,418	3,654
Originated allowance, collectively evaluated for impairment	168,197	165,028
Originated loans and leases outstanding, loans and leases	16,885,181	15,345,490
Originated loans and leases outstanding, individually evaluated for impairment	27,003	20,986
Originated loans and leases outstanding, collectively evaluated for impairment	16,858,178	15,324,504
Originated Loans and Leases [Member] | Commercial Real Estate [Member]
Valuation Allowance [Line Items]
Originated allowance, individually evaluated for impairment	26	439
Originated allowance, collectively evaluated for impairment	50,561	49,842
Originated loans and leases outstanding, loans and leases	5,754,367	5,174,783
Originated loans and leases outstanding, individually evaluated for impairment	8,521	11,114
Originated loans and leases outstanding, collectively evaluated for impairment	5,745,846	5,163,669
Originated Loans and Leases [Member] | Commercial and Industrial [Member]
Valuation Allowance [Line Items]
Originated allowance, individually evaluated for impairment	4,392	3,215
Originated allowance, collectively evaluated for impairment	49,297	48,748
Originated loans and leases outstanding, loans and leases	3,797,773	3,495,247
Originated loans and leases outstanding, individually evaluated for impairment	18,482	9,872
Originated loans and leases outstanding, collectively evaluated for impairment	3,779,291	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	7,039	5,646
Originated loans and leases outstanding, loans and leases	337,397	266,720
Originated loans and leases outstanding, individually evaluated for impairment	0	0
Originated loans and leases outstanding, collectively evaluated for impairment	337,397	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	1,996	1,843
Originated loans and leases outstanding, loans and leases	43,351	17,063
Originated loans and leases outstanding, individually evaluated for impairment	0	0
Originated loans and leases outstanding, collectively evaluated for impairment	43,351	17,063
Originated Loans and Leases [Member] | Total Commercial Loans and Leases [Member]
Valuation Allowance [Line Items]
Originated allowance, individually evaluated for impairment	4,418	3,654
Originated allowance, collectively evaluated for impairment	108,893	106,079
Originated loans and leases outstanding, loans and leases	9,932,888	8,953,813
Originated loans and leases outstanding, individually evaluated for impairment	27,003	20,986
Originated loans and leases outstanding, collectively evaluated for impairment	9,905,885	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	20,279	20,936
Originated loans and leases outstanding, loans and leases	1,772,090	1,755,713
Originated loans and leases outstanding, individually evaluated for impairment	0	0
Originated loans and leases outstanding, collectively evaluated for impairment	1,772,090	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	15,163	15,507
Originated loans and leases outstanding, loans and leases	2,297,558	2,036,226
Originated loans and leases outstanding, individually evaluated for impairment	0	0
Originated loans and leases outstanding, collectively evaluated for impairment	2,297,558	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	13,401	11,967
Originated loans and leases outstanding, loans and leases	1,746,352	1,448,268
Originated loans and leases outstanding, individually evaluated for impairment	0	0
Originated loans and leases outstanding, collectively evaluated for impairment	1,746,352	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	10,461	10,539
Originated loans and leases outstanding, loans and leases	1,136,293	1,151,470
Originated loans and leases outstanding, individually evaluated for impairment	0	0
Originated loans and leases outstanding, collectively evaluated for impairment	1,136,293	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	59,304	58,949
Originated loans and leases outstanding, loans and leases	6,952,293	6,391,677
Originated loans and leases outstanding, individually evaluated for impairment	0	0
Originated loans and leases outstanding, collectively evaluated for impairment	$ 6,952,293	$ 6,391,677

LOAN SERVICING - Mortgage Servi

LOAN SERVICING - Mortgage Servicing Rights Activity (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Servicing Assets at Fair Value [Line Items]
Mortgage banking operations	$ 5,940	$ 5,173	$ 11,469	$ 8,963
Servicing Asset at Amortized Cost, Balance [Roll Forward]
Service charges	31,114	32,090	61,191	56,671
Mortgage Servicing Rights [Member]
Servicing Assets at Fair Value [Line Items]
Mortgage loans sold with servicing retained	3,605,603		3,605,603		$ 3,256,548
Mortgage loans sold with servicing retained	282,756	226,600	519,649	356,443
Pretax gains resulting from above loan sales	5,024	5,633	8,822	9,271
Mortgage banking operations	2,223	2,007	4,397	3,610
Servicing Asset at Amortized Cost, Balance [Roll Forward]
Balance at beginning of period	30,791	22,866	29,053	13,521
Fair value of MSRs acquired	0	0	0	8,553
Additions	3,315	2,576	6,025	4,030
Payoffs and curtailments	(504)	(441)	(909)	(580)
Amortization	(632)	(557)	(1,199)	(1,080)
Balance at end of period	32,970	24,444	32,970	24,444
Loan servicing rights, fair value, start	36,445	26,962	32,419	17,546
Loan servicing rights, fair value, end	38,603	27,173	38,603	27,173
Small Business Administration Loans [Member]
Servicing Assets at Fair Value [Line Items]
Mortgage loans sold with servicing retained	305,632		305,632		$ 305,977
Mortgage loans sold with servicing retained	11,225	15,142	23,513	24,518
Pretax gains resulting from above loan sales	1,171	816	2,272	816
Servicing Asset at Amortized Cost, Balance [Roll Forward]
Balance at beginning of period	5,062	5,339	5,058	0
Additions	258	264	646	264
Amortization	(287)	(319)	(581)	(379)
Balance at end of period	4,894	5,284	4,894	5,284
Loan servicing rights, fair value, start	5,062	5,339	5,058	0
Loan servicing rights, fair value, end	4,894	5,299	4,894	5,299
Service charges	$ 699	$ 627	$ 1,449	$ 742

LOAN SERVICING - Activity in SB

LOAN SERVICING - Activity in SBA-Guaranteed Loan Servicing Asset (Detail) - SBA-Guaranteed Loan Servicing [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Servicing Assets at Fair Value [Line Items]
Valuation Allowance for Impairment of Recognized Servicing Assets, Balance	$ 500		$ 500
SBA loans sold to investors with servicing retained	305,632		305,632		$ 305,977
SBA loans sold with servicing retained	11,225	$ 15,142	23,513	$ 24,518
Gain from sale of SBA loan, pretax	1,171	816	2,272	816
Servicing Asset at Fair Value, Amount [Roll Forward]
Balance at beginning of period	5,062	5,339	5,058	0
Fair value of servicing rights acquired	0	0	0	5,399
Additions	258	264	646	264
Impairment (charge) / recovery	(139)	0	(229)	0
Amortization	(287)	(319)	(581)	(379)
Balance at end of period	4,894	5,284	4,894	5,284
Loan servicing rights, fair value, start	5,062	5,339	5,058	0
Loan servicing rights, fair value, end	$ 4,894	$ 5,299	$ 4,894	$ 5,299

LOAN SERVICING - Sensitivity of

LOAN SERVICING - Sensitivity of Fair Value to Changes in key Assumptions (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	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 25 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%	$ 1,286	$ 1,737
Sensitivity analysis of fair value, change in interest rates, plus .50%	2,319	3,220
Sensitivity analysis of fair value, change in interest rates, minus .25%	(1,584)	(1,937)
Sensitivity analysis of fair value, change in interest rates, minus .50%	$ (3,498)	$ (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)	58 months 6 days	63 months 16 days
Constant prepayment rate (annualized)	10.51%	9.29%
Discount rate	15.08%	14.87%
Effect on fair value due to 10% adverse change of consistent repayment rate	$ (161)	$ (145)
Effect on fair value due to 20% adverse change of consistent repayment rate	(312)	(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	(138)	(147)
Sensitivity analysis of fair value, transferor's interests in transferred financial assets, impact of 2 percent adverse change in discount rate	$ (269)	$ (286)

BORROWINGS - Summary of Short-T

BORROWINGS - Summary of Short-Term Borrowings (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Debt Disclosure [Abstract]
Securities sold under repurchase agreements	$ 239,804	$ 256,017
Federal Home Loan Bank advances	2,800,000	2,285,000
Federal funds purchased	1,165,000	1,000,000
Subordinated notes	129,342	137,320
Total short-term borrowings	$ 4,334,146	$ 3,678,337

BORROWINGS - Summary of Long-Te

BORROWINGS - Summary of Long-Term Borrowings (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Debt Disclosure [Abstract]
Federal Home Loan Bank advances	$ 270,045	$ 310,061
Subordinated notes	88,762	87,614
Junior subordinated debt	110,587	110,347
Other subordinated debt	159,544	160,151
Total long-term borrowings	$ 628,938	$ 668,173

BORROWINGS - Additional Informa

BORROWINGS - Additional Information (Detail) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Overnight maturities	73.00%	84.50%
FHLB [Member]
Debt Instrument [Line Items]
Credit available with FHLB	$ 7,698,000,000
Credit with FHLB utilized	$ 3,100,000,000
Federal Home Loan Bank advances are scheduled to mature periodically through the year	2,021
Minimum [Member] | FHLB [Member]
Debt Instrument [Line Items]
Effective interest rates	1.39%	0.95%
Maximum [Member] | FHLB [Member]
Debt Instrument [Line Items]
Effective interest rates	4.19%	4.19%

BORROWINGS - Junior Subordinate

BORROWINGS - Junior Subordinated Debt Trusts (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Subordinated Borrowing [Line Items]
Junior subordinated debt	$ 110,587	$ 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	3.99%
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	$ 26,493
Interest Rate	4.55%
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	$ 20,987
Interest Rate	3.66%
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	$ 21,916
Interest Rate	3.80%
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	$ 10,444
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	$ 8,582
Interest Rate	5.45%
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	Jun. 30, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Notional amount	$ 6,384,656	$ 5,628,119
Derivative asset, not offset against collateral	4,785	1,448
Derivative liability, not offset against collateral	12,346	13,581
Derivative asset, not subject to master netting arrangement	16,102	29,099
Derivative liability, not subject to master netting arrangement	54,097	15,616
Fair value, asset	20,887	30,547
Fair value, liability	66,443	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	4,372	1,982
Interest rate swaps - not designated [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, not offset against collateral	4,755	1,169
Derivative liability, not offset against collateral	7,974	11,599
Derivative asset, not subject to master netting arrangement	14,219	27,233
Derivative liability, not subject to master netting arrangement	53,724	15,303
Equity contracts - not designated [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, not offset against collateral	30	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	30	51
Interest rate lock commitments – not designated [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, not subject to master netting arrangement	1,662	1,594
Derivative liability, not subject to master netting arrangement	7	5
Forward delivery commitments – not designated [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, not subject to master netting arrangement	221	233
Derivative liability, not subject to master netting arrangement	336	148
Credit risk contracts - not designated [Member]
Derivatives, Fair Value [Line Items]
Notional amount	157,200
Derivative asset, not subject to master netting arrangement	0	39
Derivative liability, not subject to master netting arrangement	0	109
Subject to Master Netting Arrangements [Member]
Derivatives, Fair Value [Line Items]
Notional amount	3,398,435	2,951,622
Subject to Master Netting Arrangements [Member] | Interest rate contracts - designated [Member]
Derivatives, Fair Value [Line Items]
Notional amount	855,000	705,000
Subject to Master Netting Arrangements [Member] | Interest rate swaps - not designated [Member]
Derivatives, Fair Value [Line Items]
Notional amount	2,542,255	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	2,986,221	2,676,497
Not Subject to Master Netting Arrangements [Member] | Interest rate swaps - not designated [Member]
Derivatives, Fair Value [Line Items]
Notional amount	2,542,255	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	91,659	88,107
Not Subject to Master Netting Arrangements [Member] | Forward delivery commitments – not designated [Member]
Derivatives, Fair Value [Line Items]
Notional amount	107,830	106,572
Not Subject to Master Netting Arrangements [Member] | Credit risk contracts - not designated [Member]
Derivatives, Fair Value [Line Items]
Notional amount	$ 243,297	$ 235,196

DERIVATIVE INSTRUMENTS AND HE81

DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Key Data Related to Interest Rate (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	$ 6,384,656	$ 5,628,119
Fair value included in other assets	20,887	30,547
Fair value included in other liabilities	66,443	29,197
Designated as Hedging Instrument [Member] | Interest rate contracts - designated [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	855,000	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	4,372	1,982
Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	5,084,510	4,490,884
Fair value included in other assets	18,974	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	$ 61,698	$ 26,902

DERIVATIVE INSTRUMENTS AND HE82

DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Amounts Reclassified from AOCI (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Reclassified from AOCI to interest expense	$ 54,762	$ 32,619	$ 101,584	$ 54,560
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			25
Reclassified from AOCI to interest expense			(902)
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			20
Reclassified from AOCI to interest expense			$ (713)

DERIVATIVE INSTRUMENTS AND HE83

DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2018USD ($)advance	Jun. 30, 2017USD ($)	Dec. 31, 2017USD ($)
Derivative [Line Items]
Federal home loan bank, number of advances | advance	7
Notional amount	$ 6,384,656,000		$ 5,628,119,000
Additional amount in excess of posted collateral required in case of breached agreements	$ 400,000		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	$ 3,400,000
Derivative gains to be reclassified within twelve months, net of tax	2,700,000
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	$ 157,200,000
Maximum exposure under credit risk agreement assuming customer default	0		100,000
Credit risk derivatives, purchased at fair value	200,000		40,000
Credit risk derivatives, sold at fair value	$ 300,000		$ 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	Jun. 30, 2018	Dec. 31, 2017
Derivative [Line Items]
Net Amount Presented in the Balance Sheet	$ 4,785	$ 1,448
Financial Instruments	4,734	1,448
Cash Collateral	0	0
Net Amount	51	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	4,755	1,169
Financial Instruments	4,704	1,169
Cash Collateral	0	0
Net Amount	51	0
Equity contracts - not designated [Member]
Derivative [Line Items]
Net Amount Presented in the Balance Sheet	30	51
Financial Instruments	30	51
Cash Collateral	0	0
Net Amount	$ 0	$ 0

DERIVATIVE INSTRUMENTS AND HE85

DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Derivative Liabilities (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Derivative [Line Items]
Net Amount Presented in the Balance Sheet	$ 12,346	$ 13,581
Financial Instruments	11,951	12,922
Cash Collateral	0	0
Net Amount	395	659
Interest rate contracts - designated [Member]
Derivative [Line Items]
Net Amount Presented in the Balance Sheet	4,372	1,982
Financial Instruments	4,372	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	7,974	11,599
Financial Instruments	7,579	10,940
Cash Collateral	0	0
Net Amount	395	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	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Interest Rate Contracts [Member] | Interest Income - Loans and Leases [Member]
Derivative [Line Items]
Derivative financial instrument, net	$ 25	$ 900
Interest Rate Contracts [Member] | Interest Expense - Short-term Borrowings [Member]
Derivative [Line Items]
Derivative financial instrument, net	(902)	652
Interest Rate Swap [Member] | Other Income [Member]
Derivative [Line Items]
Derivative financial instrument, net	1,259	(465)
Credit risk contracts - not designated [Member] | Other Income [Member]
Derivative [Line Items]
Derivative financial instrument, net	$ 70	$ 21

COMMITMENTS, CREDIT RISK AND 87

COMMITMENTS, CREDIT RISK AND CONTINGENCIES - Off-Balance Sheet Credit Risk (Detail) - USD ($) $ in Thousands	Jun. 30, 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	$ 137,054	$ 132,904
Commitments to Extend Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Extended credit and standby letters of credit	$ 7,223,071	$ 6,957,822

COMMITMENTS, CREDIT RISK AND 88

COMMITMENTS, CREDIT RISK AND CONTINGENCIES - Additional Information (Detail)	Jun. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Percentage of Commitments to extend credit dependent upon the financial condition of the customers	76.90%

STOCK INCENTIVE PLANS - Additio

STOCK INCENTIVE PLANS - Additional Information (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units issued (in shares)	937,155	707,851
Common stock shares available under incentive compensation plans (in shares)	2,333,089
Unrecognized compensation expense	$ 19,051
Intrinsic value of outstanding and exercisable stock options	$ 2,800
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units issued (in shares)	937,155	707,851
Unrecognized compensation expense	$ 19,100
Amount subject to accelerated vesting under Incentive Compensation Plan	$ 1,300
Service-Based Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of units issued, years	3 years
Unrecognized compensation expense	$ 12,405
Performance-Based Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of units issued, years	3 years
Unrecognized compensation expense	$ 6,646
Performance-Based Units [Member] | Performance Based Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units issued (in shares)	283,037	251,379
Performance-Based Units [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 Units [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock percentage of number of units issued	175.00%
Return On Average Tangible Assets (ROATA) [Member] | Performance-Based Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of units issued, years	3 years
Return On Average Tangible Assets (ROATA) [Member] | Performance-Based Units [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock percentage of number of units issued	0.00%
Return On Average Tangible Assets (ROATA) [Member] | Performance-Based Units [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock percentage of number of units issued	175.00%
Total Shareholder Return (TSR) [Member] | Performance-Based Units [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock percentage of number of units issued	75.00%
Total Shareholder Return (TSR) [Member] | Performance-Based Units [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock percentage of number of units issued	125.00%

STOCK INCENTIVE PLANS - Schedul

STOCK INCENTIVE PLANS - Schedule of Issuance of Restricted Stock Units and Aggregate Weighted Average Grant Date Fair Values (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Restricted stock units issued (in shares)	937,155	707,851
Weighted average grant date fair values	$ 12,370	$ 10,398

STOCK INCENTIVE PLANS - Restric

STOCK INCENTIVE PLANS - Restricted Stock Units Activity (Detail) - $ / shares	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Shares, granted	937,155	707,851
Shares, unvested units outstanding at end of period	2,512,711
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 units outstanding at beginning of period	1,975,862	1,836,363
Shares, granted	937,155	707,851
Shares, vested	(257,712)	(592,202)
Shares, forfeited/expired	(180,723)	(14,679)
Shares, dividend reinvestment	38,129	28,454
Shares, unvested units outstanding at end of period	2,512,711	1,965,787
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 units outstanding at beginning of period (in USD per share)	$ 13.64	$ 12.97
Weighted average grant price, granted (in USD per share)	13.20	14.69
Weighted average grant price, vested (in USD per share)	13.18	12.84
Weighted average grant price, forfeited/expired (in USD per share)	13.30	13.23
Weighted average grant price, dividend reinvestment (in USD per share)	14.02	14.49
Weighted average grant price, invested units outstanding at end of period (in USD per share)	$ 13.56	$ 13.65

STOCK INCENTIVE PLANS - Sched92

STOCK INCENTIVE PLANS - Schedule of Certain Information Related to Restricted Stock Units (Detail) - Restricted Stock [Member] - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 4,699	$ 3,958
Tax benefit related to stock-based compensation expense	987	1,385
Fair value of units vested	$ 3,472	$ 8,013

STOCK INCENTIVE PLANS - Compone

STOCK INCENTIVE PLANS - Components of Restricted Stock Units (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2018USD ($)shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested restricted stock units (in shares) | shares	2,512,711
Unrecognized compensation expense	$ 19,051
Intrinsic value	$ 33,721
Weighted average remaining life (in years)	2 years 2 months 7 days
Service-Based Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested restricted stock units (in shares) | shares	1,449,400
Unrecognized compensation expense	$ 12,405
Intrinsic value	$ 19,451
Weighted average remaining life (in years)	2 years 3 months 13 days
Performance-Based Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested restricted stock units (in shares) | shares	1,063,311
Unrecognized compensation expense	$ 6,646
Intrinsic value	$ 14,270
Weighted average remaining life (in years)	2 years 18 days

STOCK INCENTIVE PLANS - Stock O

STOCK INCENTIVE PLANS - Stock Options Units Activity (Detail) - $ / shares	6 Months Ended
	Jun. 30, 2018	Jun. 30, 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	(197,390)	(155,597)
Shares, forfeited/expired	(4,598)	(56,510)
Shares, options outstanding and exercisable at end of period	520,662	888,070
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)	7.93	9.43
Weighted average exercise price, forfeited/expired (in USD per share)	11.65	11.17
Weighted average exercise price, options outstanding and exercisable at end of period (in USD per share)	$ 7.96	$ 8.72

RETIREMENT PLANS - Additional I

RETIREMENT PLANS - Additional Information (Detail) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2018USD ($)Retirement_Plan	Jun. 30, 2018Retirement_Plan
Retirement Benefits [Abstract]
Percent of employer match		100.00%
Employee contribution percentage		6.00%
Employee contribution | $	$ 0.9
Additional discretionary contribution, annual financial goals, percentage		3.00%
Number of supplemental non qualified retirement plans | Retirement_Plan	2	2

RETIREMENT PLANS - Contribution

RETIREMENT PLANS - Contribution Expense (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Retirement Benefits [Abstract]
401(k) contribution expense	$ 8,146	$ 6,150

RETIREMENT PLANS - Net Periodic

RETIREMENT PLANS - Net Periodic Benefit Credit (Detail) - Defined Benefit Plans [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ (4)	$ (4)	$ (8)	$ (8)
Interest cost	1,560	1,477	3,120	2,954
Expected return on plan assets	(2,895)	(2,427)	(5,790)	(4,854)
Amortization:
Unrecognized prior service cost	0	2	0	4
Unrecognized loss	623	628	1,246	1,256
Net periodic pension credit	$ (716)	$ (324)	$ (1,432)	$ (648)

INCOME TAXES - Income Tax Expen

INCOME TAXES - Income Tax Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Tax Disclosure [Abstract]
Current, federal taxes	$ 5,749	$ 6,602	$ 23,449	$ 13,290
Current, state taxes	1,045	1,086	2,749	1,585
Total current income taxes	6,794	7,688	26,198	14,875
Deferred, federal taxes	13,256	22,460	15,158	24,150
Deferred, state taxes	421	(531)	383	(2,924)
Total deferred income taxes	13,677	21,929	15,541	21,226
Income taxes	$ 20,471	$ 29,617	$ 41,739	$ 36,101
Statutory tax rate	21.00%	35.00%	21.00%	35.00%
Effective tax rate	19.40%	28.50%	19.50%	27.00%

INCOME TAXES (Details)

INCOME TAXES (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Tax Disclosure [Abstract]
Effective tax rate	19.40%	28.50%	19.50%	27.00%

OTHER COMPREHENSIVE INCOME (Det

OTHER COMPREHENSIVE INCOME (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2018USD ($)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	$ 4,409,194
Balance at end of period	4,473,242
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	(38,660)
Amounts reclassified from AOCI	(24)
Net current period other comprehensive (loss) income	(38,684)
Balance at end of period	(68,310)
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	5,600
Amounts reclassified from AOCI	(721)
Net current period other comprehensive (loss) income	4,879
Balance at end of period	10,286
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	972
Amounts reclassified from AOCI	0
Net current period other comprehensive (loss) income	972
Balance at end of period	(57,861)
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	(32,088)
Amounts reclassified from AOCI	(745)
Net current period other comprehensive (loss) income	(32,833)
Balance at end of period	$ (115,885)

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		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Net income	$ 85,206	$ 74,406	$ 171,968	$ 97,385
Less: Preferred stock dividends	2,010	2,010	4,020	4,020
Net Income Available to Common Stockholders	$ 83,196	$ 72,396	$ 167,948	$ 93,365
Basic weighted average common shares outstanding	324,170,177	323,303,460	323,956,752	280,578,720
Net effect of dilutive stock options, warrants and restricted stock	1,559,872	1,564,299	1,772,440	1,706,762
Diluted weighted average common shares outstanding	325,730,049	324,867,759	325,729,192	282,285,482
Basic (in USD per share)	$ 0.26	$ 0.22	$ 0.52	$ 0.33
Diluted (in USD per share)	$ 0.26	$ 0.22	$ 0.52	$ 0.33

EARNINGS PER COMMON SHARE - Ave

EARNINGS PER COMMON SHARE - Average Shares Excluded from Earnings Per Common Share (Detail) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Average shares excluded from the diluted earnings per common share calculation	72	1,266	46	8,107

CASH FLOW INFORMATION (Detail)

CASH FLOW INFORMATION (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Supplemental Cash Flow Elements [Abstract]
Interest paid on deposits and other borrowings	$ 98,926	$ 51,611
Income taxes paid	6,000	43,500
Transfers of loans to other real estate owned	$ 7,967	$ 22,451

BUSINESS SEGMENTS - Additional

BUSINESS SEGMENTS - Additional Information (Detail) - Segment	1 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018
Segment Reporting Information [Line Items]
Number of reportable segments		4
Mariner Finance, LLC [Member]
Segment Reporting Information [Line Items]
Stock purchase agreement, stock sold, percentage	100.00%

BUSINESS SEGMENTS - Financial I

BUSINESS SEGMENTS - Financial Information for Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Segment Reporting Information [Line Items]
Interest income	$ 294,117	$ 251,034	$ 567,044	$ 445,727
Interest expense	54,762	32,619	101,584	54,560
Net Interest Income	239,355	218,415	465,460	391,167
Provision for credit losses	15,554	16,756	30,049	27,606
Non-interest income	64,889	66,078	132,392	121,194
Non-interest expense	179,202	158,901	346,067	343,358
Amortization of intangibles	3,811	4,813	8,029	7,911
Income tax expense (benefit)	20,471	29,617	41,739	36,101
Net income (loss)	85,206	74,406	171,968	97,385
Total assets	32,257,563	30,753,726	32,257,563	30,753,726	$ 31,417,635
Total intangibles	2,335,445	2,346,654	2,335,445	2,346,654
Operating Segments [Member] | Community Banking [Member]
Segment Reporting Information [Line Items]
Interest income	284,768	241,917	548,355	427,298
Interest expense	50,118	28,414	92,478	47,279
Net Interest Income	234,650	213,503	455,877	380,019
Provision for credit losses	13,277	14,738	25,689	23,802
Non-interest income	51,137	53,031	104,449	93,748
Non-interest expense	159,675	141,441	308,342	309,725
Amortization of intangibles	3,699	4,694	7,804	7,676
Income tax expense (benefit)	21,291	30,200	43,011	36,511
Net income (loss)	87,845	75,461	175,480	96,053
Total assets	32,034,457	30,487,402	32,034,457	30,487,402
Total intangibles	2,311,429	2,322,326	2,311,429	2,322,326
Operating Segments [Member] | Wealth Management [Member]
Segment Reporting Information [Line Items]
Interest income	0	0	0	0
Interest expense	0	0	0	0
Net Interest Income	0	0	0	0
Provision for credit losses	0	0	0	0
Non-interest income	11,239	9,821	22,241	19,370
Non-interest expense	8,694	7,987	16,972	15,527
Amortization of intangibles	60	65	121	126
Income tax expense (benefit)	581	651	1,170	1,362
Net income (loss)	1,904	1,118	3,978	2,355
Total assets	25,152	22,028	25,152	22,028
Total intangibles	10,067	10,288	10,067	10,288
Operating Segments [Member] | Insurance [Member]
Segment Reporting Information [Line Items]
Interest income	19	19	39	39
Interest expense	0	0	0	0
Net Interest Income	19	19	39	39
Provision for credit losses	0	0	0	0
Non-interest income	3,695	3,496	7,998	7,821
Non-interest expense	3,895	3,456	7,606	6,771
Amortization of intangibles	52	54	104	109
Income tax expense (benefit)	(43)	10	81	357
Net income (loss)	(190)	(5)	246	623
Total assets	22,114	22,311	22,114	22,311
Total intangibles	12,140	12,231	12,140	12,231
Operating Segments [Member] | Consumer Finance [Member]
Segment Reporting Information [Line Items]
Interest income	9,349	10,114	18,643	20,016
Interest expense	885	888	1,795	1,810
Net Interest Income	8,464	9,226	16,848	18,206
Provision for credit losses	2,277	2,018	4,360	3,804
Non-interest income	653	770	1,291	1,480
Non-interest expense	5,293	5,288	10,523	10,519
Amortization of intangibles	0	0	0	0
Income tax expense (benefit)	444	1,073	918	2,140
Net income (loss)	1,103	1,617	2,338	3,223
Total assets	167,678	183,859	167,678	183,859
Total intangibles	1,809	1,809	1,809	1,809
Parent and Other [Member]
Segment Reporting Information [Line Items]
Interest income	(19)	(1,016)	7	(1,626)
Interest expense	3,759	3,317	7,311	5,471
Net Interest Income	(3,778)	(4,333)	(7,304)	(7,097)
Provision for credit losses	0	0	0	0
Non-interest income	(1,835)	(1,040)	(3,587)	(1,225)
Non-interest expense	1,645	729	2,624	816
Amortization of intangibles	0	0	0	0
Income tax expense (benefit)	(1,802)	(2,317)	(3,441)	(4,269)
Net income (loss)	(5,456)	(3,785)	(10,074)	(4,869)
Total assets	8,162	38,126	8,162	38,126
Total intangibles	$ 0	$ 0	$ 0	$ 0

FAIR VALUE MEASUREMENTS - Asset

FAIR VALUE MEASUREMENTS - Assets and Liabilities on Recurring Basis (Detail) - USD ($) $ in Thousands		Jun. 30, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities		$ 3,002,787
Assets measured at fair value, securities available for sale		3,002,787	$ 2,764,562
Loans held for sale	[1]	28,213	56,458
Derivative assets		20,887	30,547
Derivative liabilities		66,443	29,197
US Government Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities		95,526
U.S. Government-Sponsored Entities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities		306,934	343,942
Agency Collateralized Mortgage Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities		831,817	794,957
Assets measured at fair value, securities available for sale		831,817
Non-Agency Collateralized Mortgage Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities		0	1
Commercial Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities		168,324
Assets measured at fair value, securities available for sale		168,324
States of the U.S. and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities		20,735	21,093
Other Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities		1,855	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		3,002,787	2,764,401
Derivative assets		19,225	28,953
Derivative liabilities		66,436	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		1,662	1,594
Derivative liabilities		7	5
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities		3,002,787	2,763,537
Equity securities		1,172	1,025
Assets measured at fair value, securities available for sale			2,764,562
Loans held for sale		28,213	56,458
Derivative assets		20,887	30,547
Assets measured at fair value on a recurring basis, Total		3,053,059	2,851,567
Derivative liabilities		66,443	29,197
Liabilities measured at fair value on a recurring basis, Total		66,443	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		61,728	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		4,715	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		19,004	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		1,883	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]
Equity securities		177	161
Fair Value, Measurements, Recurring [Member] | Financial Services Industry [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities		995	864
Fair Value, Measurements, Recurring [Member] | US Government Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities		95,526
Fair Value, Measurements, Recurring [Member] | U.S. Government-Sponsored Entities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities		306,934	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]
Debt securities		1,577,596	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]
Debt securities		831,817	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]
Debt securities		0	1
Fair Value, Measurements, Recurring [Member] | Commercial Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities		168,324
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]
Debt securities		20,735	21,093
Fair Value, Measurements, Recurring [Member] | Other Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities		1,855	4,670
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities		0	0
Equity securities		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]
Equity securities		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]
Equity securities		0	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | US Government Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities		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]
Debt securities		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]
Debt securities		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]
Debt securities		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]
Debt securities		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]
Debt securities		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]
Debt securities		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]
Debt securities		0	0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities		3,002,787	2,763,537
Equity securities		995	864
Assets measured at fair value, securities available for sale			2,764,401
Loans held for sale		28,213	56,458
Derivative assets		19,225	28,953
Assets measured at fair value on a recurring basis, Total		3,051,220	2,849,812
Derivative liabilities		66,436	29,192
Liabilities measured at fair value on a recurring basis, Total		66,436	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		61,728	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		4,708	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		19,004	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		221	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]
Equity securities		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]
Equity securities		995	864
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | US Government Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities		95,526
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]
Debt securities		306,934	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]
Debt securities		1,577,596	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]
Debt securities		831,817	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]
Debt securities		0	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]
Debt securities		168,324
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]
Debt securities		20,735	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]
Debt securities		1,855	4,670
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities		0	0
Equity securities		0	0
Assets measured at fair value, securities available for sale			0
Loans held for sale		0	0
Derivative assets		1,662	1,594
Assets measured at fair value on a recurring basis, Total		1,662	1,594
Derivative liabilities		7	5
Liabilities measured at fair value on a recurring basis, Total		7	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		7	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		1,662	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]
Equity securities		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]
Equity securities		0	0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | US Government Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt securities		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]
Debt securities		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]
Debt securities		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]
Debt securities		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]
Debt securities		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]
Debt securities		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]
Debt securities		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]
Debt securities		$ 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	6 Months Ended	12 Months Ended
	Jun. 30, 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	1,662	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	1,662	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	1,662	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	$ 1,662	$ 1,594

FAIR VALUE MEASUREMENTS - Addit

FAIR VALUE MEASUREMENTS - Additional Information (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Mar. 31, 2017
Fair Value Measurements Disclosure [Line Items]
Fair value, assets, level 1 to level 2 transfers, amount	$ 0
Fair value, assets, level 2 to level 1 transfers, amount	0
Fair value, liabilities, level 1 to level 2 transfers, amount	0
Fair value, liabilities, level 2 to level 1 transfers, amount	0
Retained earnings	457,326,000		$ 367,658,000
Allocated allowance for loan losses	4,400,000
Provision for fair value measurements included in allowance for loan losses	4,700,000
Carrying amount of OREO	7,600,000
Written down of OREO	5,500,000
Loss from OREO included in earnings	$ 2,100,000
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	$ 7,600,000
Allocated allowance for loan losses	7,595,000		$ 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	$ 600,000

FAIR VALUE MEASUREMENTS - Ad109

FAIR VALUE MEASUREMENTS - Additional Information on Non-Recurring Basis (Detail) - USD ($) $ in Thousands		Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans		$ 4,400
Loans held for sale	[1]	28,213		$ 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		43,497		37,758
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans		7,595		4,110
Other real estate owned		5,500		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		1,460		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		6,135		1,297
Other real estate owned		5,500		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		4,894	$ 5,062	5,058	$ 5,299	$ 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		4,894		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		$ 4,894		$ 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	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 433,699	$ 479,443	$ 522,618	$ 371,407
Securities available for sale	3,002,787	2,764,562
Securities held to maturity	3,295,081	3,242,268
Securities held to maturity, fair value	3,181,275	3,218,379
Derivative assets	20,887	30,547
Deposits	22,539,787	22,399,725
Short-term borrowings	4,334,146	3,678,337
Long-term borrowings	628,938	668,173
Derivative liabilities	66,443	29,197
Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	433,699	479,443
Securities available for sale	3,002,787	2,764,562
Securities held to maturity	3,295,081	3,242,268
Net loans and leases	21,527,120	20,916,277
Loan servicing rights	37,864	34,111
Marketable securities, equity securities	1,172
Derivative assets	20,887	30,547
Accrued interest receivable	93,210	94,254
Deposits	22,539,787	22,399,725
Short-term borrowings	4,334,146	3,678,337
Long-term borrowings	628,938	668,173
Derivative liabilities	66,443	29,197
Accrued interest payable	15,138	12,480
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents, fair value	433,699	479,443
Securities available for sale	3,002,787	2,764,562
Securities held to maturity, fair value	3,181,275	3,218,379
Net loans and leases, fair value	21,163,711	20,661,196
Loan servicing rights, fair value	43,497	37,758
Marketable securities, equity securities, fair value	1,172
Derivative assets	20,887	30,547
Accrued interest receivable	93,210	94,254
Deposits, fair value	22,481,472	22,359,182
Short-term borrowings, fair value	4,334,835	3,678,723
Long-term borrowings, fair value	624,104	675,489
Derivative liabilities	66,443	29,197
Accrued interest payable	15,138	12,480
Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents, fair value	433,699	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	93,210	94,254
Deposits, fair value	17,668,799	17,779,246
Short-term borrowings, fair value	4,334,835	3,678,723
Long-term borrowings, fair value	0	0
Derivative liabilities	0	0
Accrued interest payable	15,138	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	3,002,787	2,764,401
Securities held to maturity, fair value	3,181,275	3,218,379
Net loans and leases, fair value	28,213	56,458
Loan servicing rights, fair value	0	0
Marketable securities, equity securities, fair value	995
Derivative assets	19,225	28,953
Accrued interest receivable	0	0
Deposits, fair value	4,812,673	4,579,936
Short-term borrowings, fair value	0	0
Long-term borrowings, fair value	0	0
Derivative liabilities	66,436	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	21,135,498	20,604,738
Loan servicing rights, fair value	43,497	37,758
Marketable securities, equity securities, fair value	0
Derivative assets	1,662	1,594
Accrued interest receivable	0	0
Deposits, fair value	0	0
Short-term borrowings, fair value	0	0
Long-term borrowings, fair value	624,104	675,489
Derivative liabilities	7	5
Accrued interest payable	$ 0	$ 0