First Financial Bancorp. (FFBC) 10-Q 6 Aug 19 2019 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2019	Aug. 05, 2019
Cover page.
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2019
Document Transition Report	false
Entity File Number	001-34762
Entity Registrant Name	FIRST FINANCIAL BANCORP /OH/
Entity Incorporation, State or Country Code	OH
Entity Tax Identification Number	31-1042001
Entity Address, Address Line One	255 East Fifth Street, Suite 800
Entity Address, City or Town	Cincinnati,
Entity Address, State or Province	OH
Entity Address, Postal Zip Code	45202
City Area Code	877
Local Phone Number	322-9530
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		98,570,600
Entity Central Index Key	0000708955
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Amendment Flag	false
NASDAQ/NGS (GLOBAL SELECT MARKET) [Member]
Entity Listings [Line Items]
Title of 12(b) Security	Common stock, No par value
Trading Symbol	FFBC
Security Exchange Name	NASDAQ

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Loans and Leases Receivable, Net of Deferred Income	$ 8,980,786	$ 8,824,214
ASSETS
Cash and due from banks	169,694	236,221
Interest-bearing deposits with other banks	101,668	37,738
Investment securities available-for-sale, at fair value (amortized cost $3,104,152 at June 30, 2019 and $2,792,326 at December 31, 2018)	3,152,970	2,779,255
Investment securities held-to-maturity (fair value $153,039 at June 30, 2019 and $424,118 at December 31, 2018)	154,327	429,328
Other investments	127,439	115,660
Loans held for sale	20,244	4,372
Loans
Total loans and leases	8,980,786	8,824,214
Loans and Leases Receivable, Allowance	61,549	56,542
Net loans and leases	8,919,237	8,767,672
Premises and equipment	211,313	215,652
Goodwill	879,727	880,251
Other Finite-Lived Intangible Assets, Gross	36,349	40,805
Accrued interest and other assets	664,695	479,706
Total assets	14,437,663	13,986,660
Deposits
Interest-bearing	2,332,692	2,307,071
Savings	2,953,114	3,167,325
Time	2,321,908	2,173,564
Total interest-bearing deposits	7,607,714	7,647,960
Noninterest-bearing	2,501,290	2,492,434
Total deposits	10,109,004	10,140,394
Federal funds purchased and securities sold under agreements to repurchase	260,621	183,591
FHLB short-term borrowings	1,052,700	857,100
Total short-term borrowings	1,313,321	1,040,691
Long-term debt	547,042	570,739
Total borrowed funds	1,860,363	1,611,430
Accrued interest and other liabilities	280,107	156,587
Total liabilities	12,249,474	11,908,411
SHAREHOLDERS' EQUITY
Common stock - no par value Authorized - 160,000,000 shares Issued - 104,281,794 shares in 2018 and 68,730,731 shares in 2017	1,623,699	1,633,256
Retained earnings	657,730	600,014
Accumulated other comprehensive loss	5,193	(44,408)
Treasury stock, at cost, 5,634,104 shares in 2019 and 6,387,508 shares in 2018	(98,433)	(110,613)
Total shareholders' equity	2,188,189	2,078,249
Total liabilities and shareholders' equity	14,437,663	13,986,660
Commercial real estate
Loans and Leases Receivable, Net of Deferred Income	3,903,654	3,754,681
Loans
Total loans and leases	3,903,654	3,754,681
Construction real estate
Loans and Leases Receivable, Net of Deferred Income	497,683	548,935
Loans
Total loans and leases	497,683	548,935
Commercial
Loans and Leases Receivable, Net of Deferred Income	2,547,997	2,514,661
Loans
Total loans and leases	2,547,997	2,514,661
Lease financing
Loans and Leases Receivable, Net of Deferred Income	90,638	93,415
Loans
Total loans and leases	90,638	93,415
Residential real estate
Loans and Leases Receivable, Net of Deferred Income	1,015,820	955,646
Loans
Total loans and leases	1,015,820	955,646
Home equity
Loans and Leases Receivable, Net of Deferred Income	787,139	817,282
Loans
Total loans and leases	787,139	817,282
Installment
Loans and Leases Receivable, Net of Deferred Income	89,149	93,212
Loans
Total loans and leases	89,149	93,212
Credit card
Loans and Leases Receivable, Net of Deferred Income	48,706	46,382
Loans
Total loans and leases	$ 48,706	$ 46,382

CONSOLIDATED BALANCE SHEETS CON

CONSOLIDATED BALANCE SHEETS CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Available-for-sale Securities, Amortized Cost Basis	$ 3,104,152	$ 2,792,326
Debt Securities, Held-to-maturity, Fair Value	$ 153,039	$ 424,118
Common Stock, No Par Value	$ 0	$ 0
Common Stock, Shares Authorized	160,000,000	160,000,000
Common Stock, Shares, Issued	104,281,794	104,281,794
Treasury Stock, Shares	5,634,104	6,387,508

CONSOLIDATED STATEMENTS OF INCO

CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Interest income
Loans, including fees	$ 126,365	$ 122,290	$ 249,421	$ 197,210
Investment securities
Taxable	23,616	20,844	47,851	34,514
Tax-exempt	4,336	4,068	8,594	5,725
Total interest on investment securities	27,952	24,912	56,445	40,239
Other earning assets	206	177	416	284
Total interest income	154,523	147,379	306,282	237,733
Interest expense
Deposits	20,612	14,794	39,855	25,092
Short-term borrowings	6,646	4,132	12,606	6,795
Long-term borrowings	4,963	4,474	10,004	6,055
Total interest expense	32,221	23,400	62,465	37,942
Net interest income	122,302	123,979	243,817	199,791
Provision for Loan and Lease Losses	6,658	3,735	20,741	6,038
Net interest income after provision for loan and lease losses	115,644	120,244	223,076	193,753
Noninterest income
Service Charges on Deposit Accounts	9,819	9,568	18,722	14,607
Trust and wealth management fees	3,943	3,697	8,013	7,651
Bankcard income	6,497	5,343	12,083	8,737
Client derivative fees	4,905	1,463	6,609	3,220
Net gain from sales of loans	3,432	2,316	5,322	2,904
Net gain (loss) on sales/transfers of investment securities	(37)	(30)	(215)	(30)
Other	6,079	5,899	10,931	8,105
Total noninterest income	34,638	28,256	61,465	45,194
Noninterest expenses
Salaries and employee benefits	53,985	55,531	101,897	86,633
Net occupancy	5,596	6,631	12,226	11,128
Furniture and equipment	4,222	5,298	7,638	7,338
Data processing	4,984	14,304	10,111	17,976
Marketing	1,976	2,644	3,582	3,445
Communication	747	1,118	1,475	1,577
Professional services	2,039	5,659	4,291	7,857
State intangible tax	1,307	1,078	2,617	1,843
FDIC assessments	1,065	1,323	2,015	2,217
Amortization of Intangible Assets	2,044	2,364	4,089	2,644
Other	6,413	6,805	12,936	12,385
Total noninterest expenses	84,378	102,755	162,877	155,043
Income before income taxes	65,904	45,745	121,664	83,904
Income tax expense	13,201	9,327	23,122	16,980
Net income	$ 52,703	$ 36,418	$ 98,542	$ 66,924
Earnings per common share
Basic	$ 0.54	$ 0.37	$ 1.01	$ 0.84
Diluted	0.53	0.37	1	0.83
Cash dividends declared per share	$ 0.22	$ 0.19	$ 0.44	$ 0.38
Average common shares outstanding - basic	98,083,799	97,347,533	98,005,379	79,599,709
Average common shares outstanding - diluted	98,648,384	98,432,072	98,542,947	80,629,495

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 52,703	$ 36,418	$ 98,542	$ 66,924
Other comprehensive (loss) income, net of tax
Unrealized gain (loss) on debt securities arising during the period	24,510	(8,978)	48,015	(18,808)
Change in retirement obligation	246	494	536	817
Unrealized gain (loss) on derivatives	72	159	144	315
Other comprehensive income (loss)	24,828	(8,325)	48,695	(17,676)
Comprehensive income	$ 77,531	$ 28,093	$ 147,237	$ 49,248

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Retained earnings	Accumulated other comprehensive income (loss)	Treasury stock
Beginning Balances (in shares) at Dec. 31, 2017		68,730,731			(6,661,644)
Beginning Balances at Dec. 31, 2017	$ 930,664	$ 573,109	$ 491,847	$ (20,390)	$ (113,902)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	0		5,093	(5,093)
Net income	66,924		66,924
Other comprehensive income (loss)	(17,676)			(17,676)
Cash dividends declared :
Common stock at $0.22 per share and $0.44 per share in 2019 and $0.19 per share and $0.38 per share in 2018	(30,394)		(30,394)
Stock Issued During Period, Shares, Acquisitions		35,551,063
Stock Issued During Period, Value, Acquisitions	1,045,876	$ 1,045,876
Stock Options and Warrants Acquired And Converted Pursuant To Acquisition	16,037	16,037
Stock Issued During Period, Shares, Other					53,907
Adjustments to Additional Paid in Capital, Other	0	(922)			$ 922
Exercise of stock options, net of shares purchased (in shares)					31,554
Exercise of stock options, net of shares purchased	267	(275)			$ 542
Restricted stock awards, net of forfeitures (in shares)					199,286
Restricted stock awards, net of forfeitures	(2,207)	(4,699)			$ 2,492
Share-based compensation expense	3,446	$ 3,446
Ending Balances (in shares) at Jun. 30, 2018		104,281,794			(6,376,897)
Ending Balances at Jun. 30, 2018	2,012,937	$ 1,632,572	533,470	(43,159)	$ (109,946)
Beginning Balances (in shares) at Mar. 31, 2018		68,730,731			(6,516,908)
Beginning Balances at Mar. 31, 2018	939,985	$ 571,457	515,649	(34,834)	$ (112,287)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	36,418		36,418
Other comprehensive income (loss)	(8,325)			(8,325)
Cash dividends declared :
Common stock at $0.22 per share and $0.44 per share in 2019 and $0.19 per share and $0.38 per share in 2018	(18,597)		(18,597)
Stock Issued During Period, Shares, Acquisitions		35,551,063
Stock Issued During Period, Value, Acquisitions	1,045,876	$ 1,045,876
Stock Options and Warrants Acquired And Converted Pursuant To Acquisition	16,037	16,037
Stock Issued During Period, Shares, Other					52,479
Adjustments to Additional Paid in Capital, Other	0	(898)			$ 898
Exercise of stock options, net of shares purchased (in shares)					19,754
Exercise of stock options, net of shares purchased	130	(210)			$ 340
Restricted stock awards, net of forfeitures (in shares)					67,778
Restricted stock awards, net of forfeitures	(79)	(1,182)			$ 1,103
Share-based compensation expense	1,492	$ 1,492
Ending Balances (in shares) at Jun. 30, 2018		104,281,794			(6,376,897)
Ending Balances at Jun. 30, 2018	2,012,937	$ 1,632,572	533,470	(43,159)	$ (109,946)
Beginning Balances (in shares) at Dec. 31, 2018		104,281,794			(6,387,508)
Beginning Balances at Dec. 31, 2018	2,078,249	$ 1,633,256	600,014	(44,408)	$ (110,613)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	3,542		2,636	906
Net income	98,542		98,542
Other comprehensive income (loss)	48,695			48,695
Cash dividends declared :
Common stock at $0.22 per share and $0.44 per share in 2019 and $0.19 per share and $0.38 per share in 2018	(43,462)		(43,462)
Stock Issued During Period, Shares, Other					452,134
Adjustments to Additional Paid in Capital, Other	0	(7,830)			$ 7,830
Exercise of stock options, net of shares purchased (in shares)					20,424
Exercise of stock options, net of shares purchased	90	(264)			$ 354
Restricted stock awards, net of forfeitures (in shares)					280,846
Restricted stock awards, net of forfeitures	(2,229)	(6,225)			$ 3,996
Share-based compensation expense	4,762	$ 4,762
Ending Balances (in shares) at Jun. 30, 2019		104,281,794			(5,634,104)
Ending Balances at Jun. 30, 2019	2,188,189	$ 1,623,699	657,730	5,193	$ (98,433)
Beginning Balances (in shares) at Mar. 31, 2019		104,281,794			(5,667,922)
Beginning Balances at Mar. 31, 2019	2,130,419	$ 1,622,554	626,408	(19,635)	$ (98,908)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	415		415
Net income	52,703		52,703
Other comprehensive income (loss)	24,828			24,828
Cash dividends declared :
Common stock at $0.22 per share and $0.44 per share in 2019 and $0.19 per share and $0.38 per share in 2018	(21,796)		(21,796)
Restricted stock awards, net of forfeitures (in shares)					33,818
Restricted stock awards, net of forfeitures	(146)	(621)			$ 475
Share-based compensation expense	1,766	$ 1,766
Ending Balances (in shares) at Jun. 30, 2019		104,281,794			(5,634,104)
Ending Balances at Jun. 30, 2019	$ 2,188,189	$ 1,623,699	$ 657,730	$ 5,193	$ (98,433)

CONSOLIDATED STATEMENTS OF CH_2

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS EQUITY (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Common Stock, Dividends, Per Share, Declared	$ 0.22	$ 0.19	$ 0.44	$ 0.38

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Operating activities
Net income	$ 98,542	$ 66,924
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan and lease losses	20,741	6,038
Depreciation and amortization	13,031	10,208
Stock-based compensation expense	4,762	3,446
Pension expense (income)	520	182
Net amortization (accretion) on investment securities	5,612	5,178
Net (gain) loss on sales of investment securities	215	30
Originations of loans held for sale	(138,994)	(54,041)
Net gains from sales of loans held for sale	(5,322)	(2,904)
Proceeds from sales of loans held for sale	128,445	50,004
Deferred income taxes	13,415	(12,104)
Amortization of operating leases	3,648	0
Operating Lease, Payments	(3,759)	0
Decrease (increase) cash surrender value of life insurance	2,074	(398)
Decrease (increase) in interest receivable	(2,834)	(565)
(Decrease) increase in interest payable	604	2,596
Decrease (increase) in other assets	(114,345)	28,546
(Decrease) increase in other liabilities	37,540	10,724
Net cash provided by (used in) operating activities	59,747	114,660
Investing activities
Proceeds from sales of securities available-for-sale	115,640	216,197
Proceeds from calls, paydowns and maturities of securities available-for-sale	247,652	161,733
Purchases of securities available-for-sale	(412,052)	(444,686)
Proceeds from calls, paydowns and maturities of securities held-to-maturity	6,457	26,834
Payments to Acquire Held-to-maturity Securities	0	14,014
Payments to Acquire Other Investments	11,620	0
Net decrease (increase) in interest-bearing deposits with other banks	(63,930)	(3,941)
Net decrease (increase) in loans and leases	(173,882)	(83,617)
Proceeds from disposal of other real estate owned	654	2,840
Purchases of premises and equipment	(7,805)	(13,662)
Net cash acquired from business combinations	0	64,887
Net cash paid for branch divestitures	0	(41,197)
Net cash provided by (used in) investing activities	(298,886)	(128,626)
Financing activities
Net (decrease) increase in total deposits	(31,272)	(55,757)
Net (decrease) increase in short-term borrowings	272,630	178,143
Payments of long-term debt	25,376	51,985
Proceeds from FHLB borrowings	0	50,000
Cash dividends paid on common stock	(43,460)	(40,685)
Proceeds from exercise of stock options	90	267
Net cash provided by (used in) financing activities	172,612	79,983
Cash and due from banks:
Change in cash and due from banks	(66,527)	66,017
Cash and due from banks at beginning of period	236,221	150,650
Cash and due from banks at end of period	169,694	216,667
Supplemental schedule for investing activities
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Assets, Net Of Purchase Consideration	519	3,328,802
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	(5)	4,007,743
Goodwill	$ (524)	$ 678,941

BASIS OF PRESENTATION

BASIS OF PRESENTATION	6 Months Ended
	Jun. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
BASIS OF PRESENTATION	BASIS OF PRESENTATION The Consolidated Financial Statements of First Financial Bancorp., a financial holding company principally serving Ohio, Indiana, Kentucky and Illinois, include the accounts and operations of First Financial and its wholly-owned subsidiary, First Financial Bank. All significant intercompany transactions and accounts have been eliminated in consolidation. Certain reclassifications of prior periods' amounts have been made to conform to current year presentation. Such reclassifications had no effect on net earnings. The preparation of financial statements in conformity with GAAP requires management to make estimates, assumptions and judgments that affect the amounts reported in the Consolidated Financial Statements and accompanying Notes. These estimates, assumptions and judgments are inherently subjective and may be susceptible to significant change. Actual realized amounts could differ materially from these estimates. These interim financial statements have been prepared in accordance with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they may not include all of the information and accompanying notes necessary to constitute a complete set of financial statements required by GAAP and should be read in conjunction with the audited consolidated financial statements and related notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018 . Management believes these unaudited consolidated financial statements reflect all adjustments of a normal recurring nature which are necessary for a fair presentation of the results for the interim periods presented. The results of operations for the interim periods are not necessarily indicative of the results that may be expected for the full year or any other interim period. The Consolidated Balance Sheet as of December 31, 2018 has been derived from the audited financial statements in the Company’s 2018 Form 10-K.

RECENTLY ADOPTED AND ISSUED ACC

RECENTLY ADOPTED AND ISSUED ACCOUNTING STANDARDS	6 Months Ended
	Jun. 30, 2019
Recently Adopted and Issued Accounting Standards [Abstract]
Recently Adopted and Issued Accounting Standards Disclosure [Text Block]	RECENTLY ADOPTED AND ISSUED ACCOUNTING STANDARDS Accounting Guidance Adopted in 2019 In February 2016, the FASB issued an update (ASU 2016-02, Leases) which requires lessees to record most leases on their balance sheet and recognize leasing expenses in the income statement. Operating leases where the Bank is the lessee, except for short-term leases that are subject to an accounting policy election, were recorded on the balance sheet by establishing a lease liability and corresponding ROU asset. All entities are required to use a modified retrospective approach for leases that exist or are entered into after the beginning of the earliest comparative period in the financial statements. As the Company elected the transition option provided in ASU No. 2018-11, the modified retrospective approach was applied on January 1, 2019 (as opposed to January 1, 2017). The Company also elected certain relief options offered in ASU 2016-02 including the package of practical expedients, the option not to separate lease and non-lease components and instead to account for them as a single lease component and the option not to recognize ROU assets and lease liabilities that arise from short-term leases. The Company did not elect the hindsight practical expedient, which allows entities to use hindsight when determining lease term and impairment of ROU assets. The guidance in this ASU became effective January 1, 2019 at which time the Company recorded on the Consolidated Balance Sheet an ROU asset of $60.2 million and a lease liability of $65.8 million . For further detail, see Note 7 – Leases. In March 2017, the FASB issued an update (ASU 2017-08, Receivables - Nonrefundable Fees and Other Costs (Subtopic 310-20), Premium Amortization on Purchased Callable Debt Securities) which amended the amortization period for certain purchased callable debt securities held at a premium and shortens the amortization period for the premium to the earliest call date rather than as an adjustment of yield over the contractual life of the instrument. This update more closely aligns the amortization period of premiums and discounts to expectations incorporated in market pricing on the underlying securities, as in most cases, market participants price securities to the call date that produces the worst yield when the coupon is above current market rates (that is, the security is trading at a premium) and price securities to maturity when the coupon is below market rates (that is, the security is trading at a discount) in anticipation that the borrower will act in its economic best interest in an attempt to more closely align interest income recorded on bonds held at a premium or a discount with the economics of the underlying instrument. The guidance in this ASU became effective in January 1, 2019 and did not have a material impact on the Consolidated Financial Statements. In August 2017, the FASB issued an update (ASU 2017-12, Derivatives and Hedging: Targeted Improvements to Accounting for Hedging Activities) to better align financial reporting for hedging activities with the economic objectives of those activities. This update aligns certain aspects of hedge documentation, effectiveness assessments, accounting and disclosures and expands permissible hedge strategies as of the date of adoption. The guidance in this ASU became effective January 1, 2019. Upon adoption, the Company reclassified $268.7 million of HTM securities to AFS, resulting in a $0.2 million loss in the Consolidated Statement of Income. Accounting Guidance Issued But Not Yet Adopted In June 2016, the FASB issued an update (ASU 2016-13, Financial Instruments-Credit Losses: Measurement of Credit Losses on Financial Instruments) which significantly changes how entities are required to measure credit losses for most financial assets and certain other instruments that are not measured at fair value through net income. This update will replace the current incurred loss approach for estimating credit losses with an expected loss model for instruments measured at amortized cost, including loans and leases. Expected credit losses are required to be based on amortized cost and reflect losses expected over the remaining contractual life of the asset. Management is expected to consider any available information relevant to assessing the collectibility of contractual cash flows, such as information about past events, current conditions, voluntary prepayments and reasonable and supportable forecasts, when developing expected credit loss estimates. In addition to the new framework for calculating the ALLL, this update requires allowances for available-for-sale debt securities rather than a reduction of the security's carrying amount under the current other-than-temporary impairment model. This update also simplifies the accounting model for purchased credit-impaired debt securities and loans and will require new and updated footnote disclosures. The guidance in this ASU will become effective for interim and annual reporting periods beginning after December 15, 2019. First Financial currently expects as of January 1, 2020 to recognize a one-time cumulative effect adjustment to increase the ALLL with an offsetting reduction to the retained earnings component of equity. In December 2018, the federal bank regulatory agencies approved a final rule that modifies their regulatory capital rules and provides institutions the option to phase in over a three-year period any day-one regulatory capital effects of this update. First Financial has formed an internal management committee and engaged a third party vendor to assist with the transition to the guidance set forth in this update. The committee is currently evaluating the impact of this update on First Financial’s Consolidated Financial Statements, but the ALLL is expected to increase upon adoption since the allowance will be required to cover the full expected life of the portfolio. The extent of this increase is still being evaluated and will depend on economic conditions and the composition of the loan and lease portfolio at the time of adoption. Management is currently evaluating the preliminary modeling results, which includes a qualitative framework to account for the drivers of credit losses that are not captured by the quantitative model and a model validation has been completed by an independent third party. In August 2018, the FASB issued an update (ASU No. 2018-13, Disclosure Framework: Changes to the Disclosure Requirements for Fair Value Measurement) which eliminates, adds and modifies certain disclosure requirements for fair value measurements. Under the changes, entities will no longer be required to disclose the amount of and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy, but will be required to disclose the range and weighted average used to develop significant unobservable inputs for Level 3 fair value measurements. The update is effective for interim and annual reporting periods beginning after December 15, 2019, and early adoption is permitted. This update is not expected to have a material impact on the Company’s Consolidated Financial Statements.

INVESTMENTS

INVESTMENTS	6 Months Ended
	Jun. 30, 2019
Investments, Debt and Equity Securities [Abstract]
INVESTMENTS	INVESTMENTS For the three and six months ended June 30, 2019 , there were sales of $115.6 million of AFS securities with $0.7 million in gross realized gains and $0.7 million gross realized losses. In conjunction with the adoption of ASU 2017-12 in the first quarter of 2019, First Financial reclassified $268.7 million of HTM securities to AFS resulting in a $0.2 million realized loss recorded in the Consolidated Statement of Income. For the three and six months ended June 30, 2018 , proceeds on the sale of $216.2 million of AFS securities resulted in insignificant gross gains and losses. In addition to the sale of certain securities during the second quarter of 2018, First Financial reclassified $367.9 million of HTM securities to AFS to align with post-merger investment strategies. The following is a summary of HTM and AFS investment securities as of June 30, 2019 : Held-to-maturity Available-for-sale (Dollars in thousands) Amortized Unrecognized gain Unrecognized loss Fair Amortized cost Unrealized gain Unrealized loss Fair U.S. Treasuries $ 0 $ 0 $ 0 $ 0 $ 99 $ 1 $ 0 $ 100 Securities of U.S. government agencies and corporations 0 0 0 0 24,709 239 (139 ) 24,809 Mortgage-backed securities - residential 23,736 163 (194 ) 23,705 507,434 7,716 (1,161 ) 513,989 Mortgage-backed securities - commercial 107,810 248 (1,809 ) 106,249 482,157 5,815 (1,327 ) 486,645 Collateralized mortgage obligations 11,264 0 (181 ) 11,083 940,304 18,613 (531 ) 958,386 Obligations of state and other political subdivisions 11,517 596 (111 ) 12,002 549,546 18,991 (110 ) 568,427 Asset-backed securities 0 0 0 0 521,357 1,349 (1,605 ) 521,101 Other securities 0 0 0 0 78,546 1,336 (369 ) 79,513 Total $ 154,327 $ 1,007 $ (2,295 ) $ 153,039 $ 3,104,152 $ 54,060 $ (5,242 ) $ 3,152,970 The following is a summary of HTM and AFS investment securities as of December 31, 2018 : Held-to-maturity Available-for-sale (Dollars in thousands) Amortized Unrecognized gain Unrecognized Fair Amortized Unrealized Unrealized Fair U.S. Treasuries $ 0 $ 0 $ 0 $ 0 $ 99 $ 0 $ (2 ) $ 97 Securities of U.S. government agencies and corporations 0 0 0 0 32,095 57 (233 ) 31,919 Mortgage-backed securities - residential 25,565 0 (1,045 ) 24,520 565,071 691 (7,163 ) 558,599 Mortgage-backed securities - commercial 147,780 258 (4,385 ) 143,653 423,797 819 (3,581 ) 421,035 Collateralized mortgage obligations 12,540 0 (633 ) 11,907 928,586 4,319 (6,158 ) 926,747 Obligations of state and other political subdivisions 243,443 1,954 (1,359 ) 244,038 257,300 2,554 (1,429 ) 258,425 Asset-backed securities 0 0 0 0 511,430 611 (2,810 ) 509,231 Other securities 0 0 0 0 73,948 358 (1,104 ) 73,202 Total $ 429,328 $ 2,212 $ (7,422 ) $ 424,118 $ 2,792,326 $ 9,409 $ (22,480 ) $ 2,779,255 The following table provides a summary of investment securities by contractual maturity as of June 30, 2019 , except for residential and commercial mortgage-backed securities, collateralized mortgage obligations and asset-backed securities, which are shown as single totals due to the unpredictability of the timing in principal repayments. Held-to-maturity Available-for-sale (Dollars in thousands) Amortized cost Fair value Amortized cost Fair value By Contractual Maturity: Due in one year or less $ 0 $ 0 $ 8,322 $ 8,337 Due after one year through five years 0 0 41,902 42,607 Due after five years through ten years 4,284 4,721 156,370 160,519 Due after ten years 7,233 7,281 446,306 461,386 Mortgage-backed securities - residential 23,736 23,705 507,434 513,989 Mortgage-backed securities - commercial 107,810 106,249 482,157 486,645 Collateralized mortgage obligations 11,264 11,083 940,304 958,386 Asset-backed securities 0 0 521,357 521,101 Total $ 154,327 $ 153,039 $ 3,104,152 $ 3,152,970 Unrealized gains and losses on debt securities are generally due to fluctuations in current market yields relative to the yields of the debt securities at their amortized cost. All securities with unrealized losses are reviewed quarterly to determine if any impairment is considered other than temporary, requiring a write-down to fair value. First Financial considers the percentage loss on a security, duration of the loss, average life or duration of the security, credit rating of the security and payment performance, as well as the Company's intent and ability to hold the security to maturity, when determining whether any impairment is other than temporary. At this time, First Financial does not intend to sell, and it is not more likely than not that the Company will be required to sell, debt securities temporarily impaired prior to maturity or recovery of the recorded value. First Financial had no other than temporary impairment related to its investment securities portfolio as of June 30, 2019 or December 31, 2018 . As of June 30, 2019 , the Company's investment securities portfolio consisted of 1,347 securities, of which 177 were in an unrealized loss position. As of December 31, 2018, the Company's investment securities portfolio consisted of 1,417 securities, of which 504 were in an unrealized loss position. The following tables provide the fair value and gross unrealized losses on investment securities in an unrealized loss position, aggregated by investment category and the length of time the individual securities have been in a continuous loss position: June 30, 2019 Less than 12 months 12 months or more Total (Dollars in thousands) Fair value Unrealized loss Fair Unrealized Fair Unrealized U.S. Treasuries $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 Securities of U.S. Government agencies and corporations 0 0 8,985 (139 ) 8,985 (139 ) Mortgage-backed securities - residential 10,507 (67 ) 131,539 (1,288 ) 142,046 (1,355 ) Mortgage-backed securities - commercial 99,535 (197 ) 91,179 (2,939 ) 190,714 (3,136 ) Collateralized mortgage obligations 50,381 (103 ) 94,939 (609 ) 145,320 (712 ) Obligations of state and other political subdivisions 19,676 (38 ) 14,123 (183 ) 33,799 (221 ) Asset-backed securities 218,191 (829 ) 80,710 (776 ) 298,901 (1,605 ) Other securities 6,155 (42 ) 5,424 (327 ) 11,579 (369 ) Total $ 404,445 $ (1,276 ) $ 426,899 $ (6,261 ) $ 831,344 $ (7,537 ) December 31, 2018 Less than 12 months 12 months or more Total Fair Unrealized Fair Unrealized Fair Unrealized (Dollars in thousands) value loss value loss value loss U.S. Treasuries $ 0 $ 0 $ 97 $ (2 ) $ 97 $ (2 ) Securities of U.S. Government agencies and corporations 0 0 16,777 (233 ) 16,777 (233 ) Mortgage-backed securities - residential 186,029 (935 ) 264,795 (7,273 ) 450,824 (8,208 ) Mortgage-backed securities - commercial 147,754 (369 ) 232,363 (7,597 ) 380,117 (7,966 ) Collateralized mortgage obligations 194,795 (1,546 ) 240,514 (5,245 ) 435,309 (6,791 ) Obligations of state and other political subdivisions 62,805 (299 ) 86,644 (2,489 ) 149,449 (2,788 ) Asset-backed securities 336,437 (2,312 ) 37,105 (498 ) 373,542 (2,810 ) Other securities 33,752 (884 ) 4,570 (220 ) 38,322 (1,104 ) Total $ 961,572 $ (6,345 ) $ 882,865 $ (23,557 ) $ 1,844,437 $ (29,902 ) For further detail on the fair value of investment securities, see Note 16 – Fair Value Disclosures.

LOANS AND LEASES

LOANS AND LEASES	6 Months Ended
	Jun. 30, 2019
Receivables [Abstract]
LOANS AND LEASES	LOANS AND LEASES First Financial offers clients a variety of commercial and consumer loan and lease products with distinct interest rates and payment terms. Commercial loan categories include C&I, CRE, construction real estate and lease financing. Consumer loan categories include residential real estate, home equity, installment and credit card. Lending activities are primarily concentrated in states where the Bank operates banking centers (Ohio, Indiana, Kentucky and Illinois). First Financial also offers two nationwide lending platforms, one that provides equipment and leasehold improvement financing for franchisees in the quick service and casual dining restaurant sector and another that primarily provides loans that are secured by commissions and cash collateral to insurance agents and brokers. Credit Quality. To facilitate the monitoring of credit quality for commercial loans, and for purposes of determining an appropriate ALLL, First Financial utilizes the following categories of credit grades: Pass - Higher quality loans that do not fit any of the other categories described below. Special Mention - First Financial assigns a special mention rating to loans and leases with potential weaknesses that deserve management's close attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects for the loan or lease or in First Financial's credit position at some future date. Substandard - First Financial assigns a substandard rating to loans or leases that are inadequately protected by the current sound financial worth and paying capacity of the borrower or of the collateral pledged, if any. Substandard loans and leases have well-defined weaknesses that jeopardize repayment of the debt. Substandard loans and leases are characterized by the distinct possibility that the Company will sustain some loss if the deficiencies are not addressed. Doubtful - First Financial assigns a doubtful rating to loans and leases with all the attributes of a substandard rating with the added characteristic that the weaknesses make collection or liquidation in full highly questionable and improbable, on the basis of currently existing facts, conditions and values. The possibility of loss is extremely high, but because of certain important and reasonably specific pending factors that may work to the advantage and strengthening of the credit quality of the loan or lease, its classification as an estimated loss is deferred until its more exact status may be determined. Pending factors include proposed merger, acquisition or liquidation procedures, capital injection, perfecting liens on additional collateral and refinancing plans. The credit grades previously described are derived from standard regulatory rating definitions and are assigned upon initial approval of credit to borrowers and updated periodically thereafter. First Financial considers repayment performance to be the best indicator of credit quality for consumer loans. Consumer loans that have principal and interest payments that are past due by 90 days or more are generally classified as nonperforming. Additionally, consumer loans that have been modified in a TDR are classified as nonperforming. Purchased impaired loans are not classified as nonperforming as the loans are considered to be performing under FASB ASC Topic 310-30. Commercial and consumer credit exposure by risk attribute was as follows: As of June 30, 2019 Commercial Real Estate Lease (Dollars in thousands) & industrial Construction Commercial financing Total Pass $ 2,411,763 $ 497,082 $ 3,832,028 $ 87,165 $ 6,828,038 Special Mention 62,333 0 21,507 632 84,472 Substandard 73,901 601 50,119 2,841 127,462 Doubtful 0 0 0 0 0 Total $ 2,547,997 $ 497,683 $ 3,903,654 $ 90,638 $ 7,039,972 (Dollars in thousands) Residential real estate Home equity Installment Credit card Total Performing $ 999,843 $ 781,895 $ 88,954 $ 48,599 $ 1,919,291 Nonperforming 15,977 5,244 195 107 21,523 Total $ 1,015,820 $ 787,139 $ 89,149 $ 48,706 $ 1,940,814 As of December 31, 2018 Commercial Real Estate Lease (Dollars in thousands) & industrial Construction Commercial financing Total Pass $ 2,432,834 $ 548,323 $ 3,664,434 $ 90,902 $ 6,736,493 Special Mention 24,594 603 38,653 0 63,850 Substandard 57,233 9 51,594 2,513 111,349 Doubtful 0 0 0 0 0 Total $ 2,514,661 $ 548,935 $ 3,754,681 $ 93,415 $ 6,911,692 (Dollars in thousands) Residential real estate Home equity Installment Credit card Total Performing $ 939,936 $ 811,108 $ 93,038 $ 46,382 $ 1,890,464 Nonperforming 15,710 6,174 174 0 22,058 Total $ 955,646 $ 817,282 $ 93,212 $ 46,382 $ 1,912,522 Delinquency. Loans are considered past due or delinquent when the contractual principal or interest due in accordance with the terms of the loan agreement remains unpaid after the date of the scheduled payment. Loan delinquency, including loans classified as nonaccrual, was as follows: As of June 30, 2019 (Dollars in thousands) 30 – 59 60 – 89 > 90 days Total Current Subtotal Purchased impaired Total > 90 days Loans Commercial & industrial $ 16,749 $ 1,093 $ 11,885 $ 29,727 $ 2,513,194 $ 2,542,921 $ 5,076 $ 2,547,997 $ 0 Lease financing 0 0 0 0 90,638 90,638 0 90,638 0 Construction real estate 0 595 0 595 496,903 497,498 185 497,683 0 Commercial real estate 1,925 1,345 10,042 13,312 3,847,576 3,860,888 42,766 3,903,654 0 Residential real estate 2,313 1,393 4,713 8,419 976,923 985,342 30,478 1,015,820 0 Home equity 3,160 1,683 2,603 7,446 776,821 784,267 2,872 787,139 0 Installment 205 167 63 435 88,370 88,805 344 89,149 0 Credit card 310 186 107 603 48,103 48,706 0 48,706 107 Total $ 24,662 $ 6,462 $ 29,413 $ 60,537 $ 8,838,528 $ 8,899,065 $ 81,721 $ 8,980,786 $ 107 As of December 31, 2018 (Dollars in thousands) 30 – 59 60 – 89 > 90 days Total Current Subtotal Purchased impaired Total > 90 days Loans Commercial & industrial $ 13,369 $ 41 $ 7,423 $ 20,833 $ 2,488,450 $ 2,509,283 $ 5,378 $ 2,514,661 $ 0 Lease financing 352 0 0 352 93,063 93,415 0 93,415 0 Construction real estate 0 0 0 0 548,687 548,687 248 548,935 0 Commercial real estate 6,279 1,158 12,644 20,081 3,682,455 3,702,536 52,145 3,754,681 0 Residential real estate 11,060 2,976 4,535 18,571 902,404 920,975 34,671 955,646 0 Home equity 5,245 1,228 2,578 9,051 804,835 813,886 3,396 817,282 0 Installment 420 37 145 602 92,128 92,730 482 93,212 0 Credit card 541 96 63 700 45,682 46,382 0 46,382 63 Total $ 37,266 $ 5,536 $ 27,388 $ 70,190 $ 8,657,704 $ 8,727,894 $ 96,320 $ 8,824,214 $ 63 Nonaccrual. Loans are classified as nonaccrual when, in the opinion of management, collection of principal or interest is doubtful or when principal or interest payments are 90 days or more past due. Generally, loans are classified as nonaccrual due to the continued failure to adhere to contractual payment terms by the borrower, coupled with other pertinent factors. When a loan is classified as nonaccrual, the accrual of interest income is discontinued and previously accrued but unpaid interest is reversed. Any payments received while a loan is on nonaccrual status are applied as a reduction to the carrying value of the loan. A loan classified as nonaccrual may return to accrual status if none of the principal and interest is due and unpaid, and the Bank expects repayment of the remaining contractual principal and interest. Purchased impaired loans are classified as performing, even though they may be contractually past due, as any nonpayment of contractual principal or interest is considered in the periodic re-estimation of expected cash flows and is included in the resulting recognition of current period provision for loan and lease losses or prospective yield adjustments. Troubled Debt Restructurings. A loan modification is considered a TDR when the borrower is experiencing financial difficulty and concessions are made by the Company that would not otherwise be considered for a borrower with similar credit characteristics. The most common types of modifications include interest rate reductions, maturity extensions and modifications to principal amortization, including interest-only structures. Modified terms are dependent upon the financial position and needs of the individual borrower. If the modification agreement is violated, the loan is managed by the Company’s credit administration group for resolution, which may result in foreclosure in the case of real estate. TDRs are generally classified as nonaccrual for a minimum period of six months and may qualify for return to accrual status once they have demonstrated performance with the restructured terms of the loan agreement. First Financial had 177 TDRs totaling $48.4 million at June 30, 2019 , including $37.4 million on accrual status and $11.0 million classified as nonaccrual. First Financial had $0.3 million of commitments outstanding to lend additional funds to borrowers whose loan terms have been modified through TDRs, and the ALLL included reserves of $5.6 million related to TDRs at June 30, 2019 . Additionally, as of June 30, 2019 , $12.0 million of accruing TDRs have been performing in accordance with the restructured terms for more than one year. First Financial had 196 TDRs totaling $38.5 million at December 31, 2018 , including $16.1 million of loans on accrual status and $22.4 million classified as nonaccrual. First Financial had no commitments outstanding to lend additional funds to borrowers whose loan terms had been modified through TDRs. At December 31, 2018 , the ALLL included reserves of $1.5 million related to TDRs, and $7.9 million of the accruing TDRs had been performing in accordance with the restructured terms for more than one year. The following tables provide information on loan modifications classified as TDRs during the three and six months ended June 30, 2019 and 2018 : Three months ended June 30, 2019 June 30, 2018 (Dollars in thousands) Number of loans Pre-modification loan balance Period end balance Number of loans Pre-modification loan balance Period end balance Commercial & industrial 1 $ 14,889 $ 14,889 8 $ 6,221 $ 6,183 Construction real estate 0 0 0 0 0 0 Commercial real estate 1 42 42 4 2,047 2,016 Residential real estate 12 2,008 1,713 1 201 201 Home equity 11 306 277 0 0 0 Installment 0 0 0 0 0 0 Total 25 $ 17,245 $ 16,921 13 $ 8,469 $ 8,400 Six months ended June 30, 2019 June 30, 2018 (Dollars in thousands) Number of loans Pre-modification loan balance Period end balance Number of loans Pre-modification loan balance Period end balance Commercial & industrial 6 $ 22,527 $ 22,550 12 $ 7,149 $ 7,096 Construction real estate 0 0 0 0 0 0 Commercial real estate 7 1,365 1,274 6 2,119 2,088 Residential real estate 17 2,466 2,171 3 294 294 Home equity 12 323 294 0 0 0 Installment 0 0 0 0 0 0 Total 42 $ 26,681 $ 26,289 21 $ 9,562 $ 9,478 For TDRs identified during the three and six months ended June 30, 2019 , there were no chargeoffs for the portion of TDRs determined to be uncollectible. For TDRs identified during the three and six months ended June 30, 2018 , there was $0.1 million chargeoffs for the portion of TDRs determined to be uncollectible. The following table provides information on how TDRs were modified during the three and six months ended June 30, 2019 and 2018 : Three months ended Six months ended June 30, June 30, (Dollars in thousands) 2019 2018 2019 2018 Extended maturities $ 0 $ 2,000 $ 2,877 $ 2,888 Adjusted interest rates 0 0 5,284 52 Combination of rate and maturity changes 0 0 508 0 Forbearance 15,078 6,199 15,635 6,199 Other (1) 1,843 201 1,985 339 Total $ 16,921 $ 8,400 $ 26,289 $ 9,478 (1) Includes covenant modifications and other concessions, or combination of concessions, that do not consist of interest rate adjustments, forbearance and maturity extensions First Financial considers repayment performance as an indication of the effectiveness of the Company's loan modifications. Borrowers that are 90 days or more past due on any principal or interest payments, or who prematurely terminate a restructured loan agreement without paying the contractual principal balance (for example, in a deed-in-lieu arrangement), are considered to be in payment default of the terms of the TDR agreement. For the three months ended June 30, 2019 , there were no TDRs for which there was a payment default during the period that occurred within twelve months of the loan modification. For the six months ended June 30, 2019 , there were two TDR relationships for $6.8 million , for which there was a payment default during the period that occurred within twelve months of the loan modification. There was one TDR, insignificant in amount, for which there was a payment default during the period that occurred within twelve months of the loan modification for the three and six month periods ended June 30, 2018 . Impaired Loans. Loans classified as nonaccrual and loans modified as TDRs are considered impaired. The following table provides information on impaired loans, excluding purchased impaired loans: (Dollars in thousands) June 30, 2019 December 31, 2018 Impaired loans Nonaccrual loans (1) Commercial & industrial $ 18,502 $ 30,925 Lease financing 295 22 Construction real estate 6 9 Commercial real estate 15,981 20,500 Residential real estate 11,627 13,495 Home equity 4,745 5,580 Installment 195 169 Nonaccrual loans 51,351 70,700 Accruing troubled debt restructurings 37,420 16,109 Total impaired loans $ 88,771 $ 86,809 (1) Nonaccrual loans include nonaccrual TDRs of $11.0 million and $22.4 million as of June 30, 2019 and December 31, 2018 , respectively. Three months ended Six months ended June 30, June 30, (Dollars in thousands) 2019 2018 2019 2018 Interest income effect on impaired loans Gross amount of interest that would have been recorded under original terms $ 1,467 $ 1,132 $ 3,080 $ 1,934 Interest included in income Nonaccrual loans 192 146 527 226 Troubled debt restructurings 269 189 505 313 Total interest included in income 461 335 1,032 539 Net impact on interest income $ 1,006 $ 797 $ 2,048 $ 1,395 First Financial individually reviews all impaired commercial loan relationships, as well as consumer loan TDRs greater than $250,000 , to determine if a specific allowance is necessary based on the borrower’s overall financial condition, payment record, support from guarantors and the realizable value of any collateral. Specific allowances are based on discounted cash flows using the loan's initial effective interest rate or the fair value of the collateral for certain collateral dependent loans. First Financial's investment in impaired loans was as follows: As of June 30, 2019 As of December 31, 2018 (Dollars in thousands) Current balance Contractual principal balance Related allowance Current balance Contractual Related Loans with no related allowance recorded Commercial & industrial $ 38,964 $ 41,783 $ 0 $ 36,694 $ 42,561 $ 0 Lease financing 295 295 0 22 22 0 Construction real estate 6 25 0 9 26 0 Commercial real estate 18,753 26,280 0 23,513 31,375 0 Residential real estate 14,937 17,036 0 17,297 19,975 0 Home equity 5,244 6,158 0 6,351 7,461 0 Installment 195 328 0 174 563 0 Total 78,394 91,905 0 84,060 101,983 0 Loans with an allowance recorded Commercial & industrial 8,420 8,420 4,908 939 939 667 Lease financing 0 0 0 0 0 0 Construction real estate 0 0 0 0 0 0 Commercial real estate 916 916 30 1,509 1,509 461 Residential real estate 1,041 1,041 85 301 301 32 Home equity 0 0 0 0 0 0 Installment 0 0 0 0 0 0 Total 10,377 10,377 5,023 2,749 2,749 1,160 Total Commercial & industrial 47,384 50,203 4,908 37,633 43,500 667 Lease financing 295 295 0 22 22 0 Construction real estate 6 25 0 9 26 0 Commercial real estate 19,669 27,196 30 25,022 32,884 461 Residential real estate 15,978 18,077 85 17,598 20,276 32 Home equity 5,244 6,158 0 6,351 7,461 0 Installment 195 328 0 174 563 0 Total $ 88,771 $ 102,282 $ 5,023 $ 86,809 $ 104,732 $ 1,160 First Financial's average impaired loans by class and interest income recognized by class was as follows: Three months ended June 30, 2019 June 30, 2018 (Dollars in thousands) Average Interest Average Interest Loans with no related allowance recorded Commercial & industrial $ 34,553 $ 212 $ 9,714 $ 73 Lease financing 298 0 0 0 Construction real estate 7 0 25 1 Commercial real estate 20,731 98 27,516 140 Residential real estate 15,787 69 9,173 76 Home equity 5,735 28 5,222 27 Installment 185 1 305 1 Total 77,296 408 51,955 318 Loans with an allowance recorded Commercial & industrial 5,851 43 309 6 Lease financing 0 0 0 0 Construction real estate 0 0 0 0 Commercial real estate 1,707 4 358 3 Residential real estate 670 6 1,042 7 Home equity 0 0 101 1 Installment 0 0 0 0 Total 8,228 53 1,810 17 Total Commercial & industrial 40,404 255 10,023 79 Lease financing 298 0 0 0 Construction real estate 7 0 25 1 Commercial real estate 22,438 102 27,874 143 Residential real estate 16,457 75 10,215 83 Home equity 5,735 28 5,323 28 Installment 185 1 305 1 Total $ 85,524 $ 461 $ 53,765 $ 335 Six months ended June 30, 2019 June 30, 2018 (Dollars in thousands) Average Interest Average Interest Loans with no related allowance recorded Commercial & industrial $ 35,267 $ 491 $ 8,863 $ 99 Lease financing 206 0 27 0 Construction real estate 8 0 26 2 Commercial real estate 21,658 201 24,485 239 Residential real estate 16,290 155 8,407 123 Home equity 5,940 66 4,933 47 Installment 181 2 288 1 Total 79,550 915 47,029 511 Loans with an allowance recorded Commercial & industrial 4,214 86 262 6 Lease financing 0 0 0 0 Construction real estate 0 0 0 0 Commercial real estate 1,641 23 1,278 6 Residential real estate 547 8 1,047 14 Home equity 0 0 100 2 Installment 0 0 0 0 Total 6,402 117 2,687 28 Total Commercial & industrial 39,481 577 9,125 105 Lease financing 206 0 27 0 Construction real estate 8 0 26 2 Commercial real estate 23,299 224 25,763 245 Residential real estate 16,837 163 9,454 137 Home equity 5,940 66 5,033 49 Installment 181 2 288 1 Total $ 85,952 $ 1,032 $ 49,716 $ 539 Lease financing. The Company prospectively applied Topic 842 in the first quarter of 2019. First Financial originates both sales-type and direct financing leases, and the Company manages and reviews lease residuals in accordance with its credit policies. Sales-type lease contracts contain the ability to purchase the underlying equipment at lease maturity and profit or loss is recognized at lease commencement. Direct financing leases are generally three to five years in length and may be extended at maturity, however, early cancellation may result in a fee to the borrower. For direct financing leases, the net unearned income is deferred and amortized over the life of the lease. Income recognized in first six months of 2019 related to the implementation of Topic 842 was insignificant. OREO. OREO consists of properties acquired by the Company primarily through the loan foreclosure or repossession process, that results in partial or total satisfaction of problem loans. Changes in OREO were as follows: Three months ended Six months ended June 30, June 30, (Dollars in thousands) 2019 2018 2019 2018 Balance at beginning of period $ 1,665 $ 1,065 $ 1,401 $ 2,781 Additions Commercial & industrial 136 1,020 136 1,190 Residential real estate 768 525 1,272 984 Total additions 904 1,545 1,408 2,174 Disposals Commercial & industrial (248 ) (326 ) (270 ) (2,430 ) Residential real estate (223 ) (292 ) (384 ) (410 ) Total disposals (471 ) (618 ) (654 ) (2,840 ) Valuation adjustment Commercial & industrial (55 ) 0 (55 ) (97 ) Residential real estate (622 ) (139 ) (679 ) (165 ) Total valuation adjustment (677 ) (139 ) (734 ) (262 ) Balance at end of period $ 1,421 $ 1,853 $ 1,421 $ 1,853

ALLOWANCE FOR LOAN AND LEASE LO

ALLOWANCE FOR LOAN AND LEASE LOSSES	6 Months Ended
	Jun. 30, 2019
Receivables [Abstract]
ALLOWANCE FOR LOAN AND LEASE LOSSES	ALLOWANCE FOR LOAN AND LEASE LOSSES Management maintains the ALLL at a level that it considers sufficient to absorb probable incurred loan and lease losses inherent in the portfolio. Management determines the adequacy of the ALLL based on historical loss experience as well as other significant factors such as composition of the portfolio, economic conditions, geographic footprint, the results of periodic internal and external evaluations of delinquent, nonaccrual and classified loans and any other adverse situations that may affect a specific borrower's ability to repay, including the timing of future payments. The ALLL is increased by provision expense and decreased by charge-offs, net of recoveries of amounts previously charged-off. First Financial's policy is to charge-off all or a portion of a loan when, in management's opinion, it is unlikely to collect the principal amount owed in full either through payments from the borrower or from the liquidation of collateral. Changes in the ALLL by loan category were as follows: Three months ended June 30, 2019 Real Estate (Dollars in thousands) Commercial & industrial Lease financing Construction Commercial Residential Home Equity Installment Credit card Total Allowance for loan and lease losses: Balance at beginning of period $ 19,926 $ 1,373 $ 2,793 $ 20,400 $ 5,043 $ 5,250 $ 380 $ 1,557 $ 56,722 Provision for loan and lease losses 6,242 20 121 (211 ) 14 174 32 266 6,658 Gross charge-offs (1,873 ) 0 0 (86 ) (150 ) (689 ) (78 ) (289 ) (3,165 ) Recoveries 291 0 5 254 101 572 61 50 1,334 Total net charge-offs (1,582 ) 0 5 168 (49 ) (117 ) (17 ) (239 ) (1,831 ) Ending allowance for loan and lease losses $ 24,586 $ 1,393 $ 2,919 $ 20,357 $ 5,008 $ 5,307 $ 395 $ 1,584 $ 61,549 Three months ended June 30, 2018 Real Estate (Dollars in thousands) Commercial & industrial Lease financing Construction Commercial Residential Home Equity Installment Credit card Total Allowance for loan and lease losses: Balance at beginning of period $ 18,038 $ 626 $ 4,267 $ 20,321 $ 4,727 $ 4,828 $ 290 $ 1,283 $ 54,380 Provision for loan and lease losses 3,328 170 (282 ) (619 ) (28 ) 171 136 859 3,735 Loans charged off (4,356 ) 0 0 (78 ) (101 ) (385 ) (218 ) (684 ) (5,822 ) Recoveries 518 1 0 887 70 187 82 38 1,783 Total net charge-offs (3,838 ) 1 0 809 (31 ) (198 ) (136 ) (646 ) (4,039 ) Ending allowance for loan and lease losses $ 17,528 $ 797 $ 3,985 $ 20,511 $ 4,668 $ 4,801 $ 290 $ 1,496 $ 54,076 Six months ended June 30, 2019 Real Estate (Dollars in thousands) Commercial & industrial Lease financing Construction Commercial Residential Home equity Installment Credit card Total Allowance for loan and lease losses: Balance at beginning of period $ 18,746 $ 1,130 $ 3,413 $ 21,048 $ 4,964 $ 5,348 $ 362 $ 1,531 $ 56,542 Provision for loan and lease losses 19,510 363 (562 ) 282 139 359 51 599 20,741 Loans charged off (14,201 ) (100 ) 0 (1,300 ) (232 ) (1,157 ) (127 ) (630 ) (17,747 ) Recoveries 531 0 68 327 137 757 109 84 2,013 Total net charge-offs (13,670 ) (100 ) 68 (973 ) (95 ) (400 ) (18 ) (546 ) (15,734 ) Ending allowance for loan and lease losses $ 24,586 $ 1,393 $ 2,919 $ 20,357 $ 5,008 $ 5,307 $ 395 $ 1,584 $ 61,549 Six months ended June 30, 2018 Real Estate (Dollars in thousands) Commercial & industrial Lease financing Construction Commercial Residential Home equity Installment Credit card Total Allowance for loan and lease losses: Balance at beginning of period $ 17,598 $ 675 $ 3,577 $ 20,930 $ 4,683 $ 4,935 $ 307 $ 1,316 $ 54,021 Provision for loan and lease losses 4,217 121 408 196 86 (123 ) 87 1,046 6,038 Loans charged off (5,241 ) 0 0 (2,254 ) (197 ) (627 ) (234 ) (938 ) (9,491 ) Recoveries 954 1 0 1,639 96 616 130 72 3,508 Total net charge-offs (4,287 ) 1 0 (615 ) (101 ) (11 ) (104 ) (866 ) (5,983 ) Ending allowance for loan and lease losses $ 17,528 $ 797 $ 3,985 $ 20,511 $ 4,668 $ 4,801 $ 290 $ 1,496 $ 54,076 As of June 30, 2019 Real Estate (Dollars in thousands) Commercial & industrial Lease financing Construction Commercial Residential Home equity Installment Credit card Total Ending allowance balance attributable to loans Individually evaluated for impairment $ 4,908 $ 0 $ 0 $ 30 $ 85 $ 0 $ 0 $ 0 $ 5,023 Collectively evaluated for impairment 19,678 1,393 2,919 20,327 4,923 5,307 395 1,584 56,526 Ending allowance for loan and lease losses $ 24,586 $ 1,393 $ 2,919 $ 20,357 $ 5,008 $ 5,307 $ 395 $ 1,584 $ 61,549 Loans Individually evaluated for impairment $ 47,384 $ 295 $ 6 $ 19,669 $ 15,978 $ 5,244 $ 195 $ 0 $ 88,771 Collectively evaluated for impairment 2,500,613 90,343 497,677 3,883,985 999,842 781,895 88,954 48,706 8,892,015 Total loans $ 2,547,997 $ 90,638 $ 497,683 $ 3,903,654 $ 1,015,820 $ 787,139 $ 89,149 $ 48,706 $ 8,980,786 As of December 31, 2018 Real Estate (Dollars in thousands) Commercial & industrial Lease financing Construction Commercial Residential Home equity Installment Credit card Total Ending allowance balance attributable to loans Individually evaluated for impairment $ 667 $ 0 $ 0 $ 461 $ 32 $ 0 $ 0 $ 0 $ 1,160 Collectively evaluated for impairment 18,079 1,130 3,413 20,587 4,932 5,348 362 1,531 55,382 Ending allowance for loan and lease losses $ 18,746 $ 1,130 $ 3,413 $ 21,048 $ 4,964 $ 5,348 $ 362 $ 1,531 $ 56,542 Loans Individually evaluated for impairment $ 37,633 $ 22 $ 9 $ 25,022 $ 17,598 $ 6,351 $ 174 $ 0 $ 86,809 Collectively evaluated for impairment 2,477,028 93,393 548,926 3,729,659 938,048 810,931 93,038 46,382 8,737,405 Total loans $ 2,514,661 $ 93,415 $ 548,935 $ 3,754,681 $ 955,646 $ 817,282 $ 93,212 $ 46,382 $ 8,824,214

GOODWILL AND OTHER INTANGIBLE A

GOODWILL AND OTHER INTANGIBLE ASSETS	6 Months Ended
	Jun. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
GOODWILL AND OTHER INTANGIBLE ASSETS	GOODWILL AND OTHER INTANGIBLE ASSETS Goodwill. Assets and liabilities acquired in a business combination are recorded at their estimated fair values as of the acquisition date. The excess cost of the acquisition over the fair value of net assets acquired is recorded as goodwill. Changes in the carrying amount of goodwill for the six months ended June 30, 2019 and the year ended December 31, 2018 were as follows: (Dollars in thousands) June 30, December 31, Balance at beginning of year $ 880,251 $ 204,084 Goodwill resulting from business combinations (524 ) 676,167 Balance at end of period $ 879,727 $ 880,251 During 2018, First Financial recorded additions to goodwill resulting from the merger with MSFG of $676.2 million , and in the first quarter of 2019, First Financial recorded its final adjustments to goodwill associated related to the merger. For further detail on the merger with MSFG, see Note 17 - Business Combinations. Goodwill is evaluated for impairment on an annual basis as of October 1 of each year, or whenever events or changes in circumstances indicate that the fair value of a reporting unit may be below its carrying value. First Financial performed its most recent annual impairment test as of October 1, 2018 and no impairment was indicated. As of June 30, 2019 , no events or changes in circumstances indicated that the fair value of a reporting unit was below its carrying value. Other intangible assets. As of June 30, 2019 and December 31, 2018 , First Financial had $36.3 million and $40.8 million , respectively, of other intangible assets included in Other intangibles in the Consolidated Balance Sheets, which primarily consist of core deposit intangibles. Core deposit intangibles represent the estimated fair value of acquired customer deposit relationships on the date of acquisition and are amortized on an accelerated basis over their estimated useful lives. Core deposit intangibles were $33.8 million and $37.9 million as of June 30, 2019 and December 31, 2018 , respectively. First Financial's core deposit intangibles have an estimated weighted average remaining life of 8.4 years . Amortization expense recognized on intangible assets for the three months ended June 30, 2019 and 2018 was $2.0 million and $2.4 million , respectively. Amortization expense recognized on intangible assets for the six months ended June 30, 2019 and 2018 was $4.1 million and $2.6 million , respectively.

LEASES

LEASES	6 Months Ended
	Jun. 30, 2019
Leases [Abstract]
Leases	LEASES A lease is defined as a contract, or part of a contract, that conveys the right to control the use of identified property, plant or equipment for a period of time in exchange for consideration. First Financial is primarily the lessee in its leasing agreements, and substantially all of those agreements are for real estate property for branches, ATM locations and office space. On January 1, 2019, the Company adopted Topic 842 and all subsequent updates that modified Topic 842. For First Financial, this update primarily affected the accounting treatment for operating lease agreements in which the Company is the lessee. With the adoption of Topic 842, operating lease agreements were required to be recognized on the consolidated balance sheets as an ROU asset and a corresponding lease liability. Substantially all of the Company's leases are classified as operating leases, and therefore, were previously not recognized on the Company’s consolidated balance sheets. The Company's right to use an asset over the life of a lease is recorded as a "right of use" asset in Accrued interest and other assets on the Consolidated Balance Sheet and was $59.9 million at June 30, 2019 . Certain adjustments to the ROU asset may be required for items such as initial direct costs paid or incentives received. First Financial recorded a $65.5 million lease liability in Accrued interest and other liabilities on the Consolidated Balance Sheet at June 30, 2019 . The calculated amount of the ROU assets and lease liabilities are impacted by the length of the lease term and the discount rate used to calculate the present value of minimum lease payments. Regarding the discount rate, Topic 842 requires the use of the rate implicit in the lease whenever this rate is readily determinable. As this rate is rarely determinable, the Company utilizes its incremental borrowing rate at lease inception, on a collateralized basis, over a similar term. For operating leases existing prior to January 1, 2019, the rate for the remaining lease term as of January 1, 2019 was used. Leases with an initial term of 12 months or less are not recorded on the balance sheet and First Financial recognizes lease expense for these leases on a straight-line basis over the term of the lease. Most leases include one or more options to renew, with renewal terms that can extend the lease term from one to 20 years or more. The exercise of renewal options on operating leases is at the Company's sole discretion, and certain leases may include options to purchase the leased property. If at lease inception, the Company considers the exercising of a renewal option to be reasonably certain, the Company will include the extended term in the calculation of the ROU asset and lease liability. First Financial does not enter into lease agreements which contain material residual value guarantees or material restrictive covenants. Certain leases provide for increases in future minimum annual rental payments as defined in the lease agreements and leases generally also include real estate taxes and common area maintenance charges in the annual rental payments. The components of lease expense were as follows: Three months ended Six months ended (dollars in thousands) June 30, 2019 June 30, 2019 Operating lease cost $ 1,822 $ 3,648 Short-term lease cost 0 1 Variable lease cost 633 1,230 Total operating lease cost $ 2,455 $ 4,879 Future minimum commitments due under these lease agreements as of June 30, 2019 are as follows: (dollars in thousands) Operating leases 2019 (remaining six months) $ 3,770 2020 7,469 2021 7,093 2022 6,741 2023 6,695 Thereafter 55,530 Total lease payments 87,298 Less imputed interest 21,794 Total $ 65,504 The lease term and discount rate at June 30, 2019 were as follows: Operating leases Weighted-average remaining lease term 16.5 years Weighted-average discount rate 3.4 % Supplemental cash information at June 30, 2019 related to leases was as follows: Six months ended (dollars in thousands) June 30, 2019 Cash paid for amounts included in the measurement of lease liabilities Operating cash flows from operating leases $ 3,759 ROU assets obtained in exchange for lease obligations Operating leases 64,938

BORROWINGS

BORROWINGS	6 Months Ended
	Jun. 30, 2019
Debt Disclosure [Abstract]
BORROWINGS	BORROWINGS Short-term borrowings on the Consolidated Balance Sheets include repurchase agreements utilized for corporate sweep accounts with cash management account agreements in place, federal funds purchased, overnight advances from the FHLB and a short-term line of credit. All repurchase agreements are subject to terms and conditions agreed to by the Bank and the client. To secure its liability to the client, the Bank is authorized to sell or repurchase U.S. Treasury, government agency and mortgage-backed securities. The following shows the remaining contractual maturity of repurchase agreements by collateral pledged: (Dollars in thousands) Overnight and continuous Repurchase agreements Mortgage-backed securities $ 25,966 Collateralized mortgage obligations 59,655 Total $ 85,621 Securities sold under agreements to repurchase are secured by securities with a carrying amount of $85.7 million and $85.5 million , as of June 30, 2019 and December 31, 2018 , respectively. First Financial had $175.0 million in federal funds purchased at June 30, 2019 and $99.0 million as of December 31, 2018 . The Company also had $1.1 billion in short-term borrowings with the FHLB at June 30, 2019 and $857.1 million as of December 31, 2018 . These short-term borrowings are used to manage normal liquidity needs and support the Company's asset and liability management strategies. First Financial has a $30.0 million short-term credit facility with an unaffiliated bank that matures in September 2019. This facility can have a variable or fixed interest rate and provides First Financial additional liquidity, if needed, for various corporate activities including the repurchase of First Financial common stock and the payment of dividends to shareholders. As of June 30, 2019 and December 31, 2018 , there was no outstanding balance. The credit agreement requires First Financial to comply with certain covenants including those related to asset quality and capital levels, and First Financial was in compliance with all covenants associated with this facility as of June 30, 2019 and December 31, 2018 . First Financial had $547.0 million and $570.7 million of long-term debt as of June 30, 2019 and December 31, 2018, respectively, which included subordinated notes, FHLB long term advances and an interest free loan with a municipality. The following is a summary of First Financial's long-term debt: June 30, 2019 December 31, 2018 (Dollars in thousands) Amount Average rate Amount Average rate Subordinated notes $ 170,758 5.13 % $ 170,550 5.28 % Unamortized debt issuance costs (1,096 ) N/A (1,185 ) N/A FHLB borrowings 376,605 2.13 % 400,599 2.08 % Capital loan with municipality 775 0.00 % 775 0.00 % Total long-term debt $ 547,042 3.07 % $ 570,739 3.04 % In 2015, First Financial issued $120.0 million of subordinated notes, which have a fixed interest rate of 5.125% payable semiannually and maturing in August 2025. These notes are not redeemable by the Company, or callable by the holders of the notes prior to maturity. In addition, First Financial acquired $49.5 million of variable rate subordinated notes in the MSFG merger that were issued to previously formed trusts in exchange for the trust proceeds. Interest on the acquired subordinated notes is payable quarterly, in arrears, and the Company has the option to defer interest payments for a period not to exceed 20 consecutive quarters. These acquired subordinated notes mature 30 years after the date of original issuance and may be called at par following the 5 year anniversary of issuance. First Financial also acquired $8.4 million of 7.40% fixed rate private placement subordinated debt in conjunction with the MSFG merger that was issued in 2015 and matures in 2025. These notes are redeemable by the Company at par following the 5 year anniversary of issuance. The subordinated notes are treated as Tier 2 capital for regulatory capital purposes and are included in Long-term debt on the Consolidated Balance Sheets. In addition to subordinated notes, long-term debt included $376.6 million and $400.6 million of fixed rate FHLB long-term advances as of June 30, 2019 and December 31, 2018 , respectively. As of June 30, 2019 , long-term FHLB advances had a weighted average interest rate of 2.13%

ACCUMULATED OTHER COMPREHENSIVE

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)	6 Months Ended
	Jun. 30, 2019
Equity [Abstract]
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)	ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) Shareholders’ equity is affected by transactions and valuations of asset and liability positions that require adjustments to accumulated other comprehensive income (loss). The related tax effects allocated to other comprehensive income and reclassifications out of accumulated other comprehensive income (loss) are as follows: Three months ended June 30, 2019 Total other comprehensive income (loss) Total accumulated other comprehensive income (loss) (Dollars in thousands) Prior to reclass Reclass from Pre-tax Tax effect Net of tax Beginning balance Net activity Ending balance Unrealized gain (loss) on debt securities $ 31,144 $ (37 ) $ 31,181 $ (6,671 ) $ 24,510 $ 12,810 $ 24,510 $ 37,320 Unrealized gain (loss) on derivatives 94 0 94 (22 ) 72 (145 ) 72 (73 ) Retirement obligation 0 (320 ) 320 (74 ) 246 (32,300 ) 246 (32,054 ) Total $ 31,238 $ (357 ) $ 31,595 $ (6,767 ) $ 24,828 $ (19,635 ) $ 24,828 $ 5,193 Three months ended June 30, 2018 Total other comprehensive income (loss) Total accumulated other comprehensive income (loss) (Dollars in thousands) Prior to reclass Reclass from Pre-tax Tax effect Net of tax Beginning balance Net activity Ending balance Unrealized gain (loss) on debt securities $ (11,456 ) $ (30 ) $ (11,426 ) $ 2,448 $ (8,978 ) $ (10,202 ) $ (8,978 ) $ (19,180 ) Unrealized gain (loss) on derivatives 203 0 203 (44 ) 159 (545 ) 159 (386 ) Retirement obligation 0 (452 ) 452 42 494 (24,087 ) 494 (23,593 ) Total $ (11,253 ) $ (482 ) $ (10,771 ) $ 2,446 $ (8,325 ) $ (34,834 ) $ (8,325 ) $ (43,159 ) Six months ended June 30, 2019 Total other comprehensive income Total accumulated other comprehensive income (loss) (Dollars in thousands) Prior to Reclass Pre-tax Tax effect Net of tax Beginning balance Net activity Cumulative effect of new standard Ending balance Unrealized gain (loss) on debt securities $ 60,869 $ (215 ) $ 61,084 $ (13,069 ) $ 48,015 $ (11,601 ) $ 48,015 $ 906 $ 37,320 Unrealized gain (loss) on derivatives 187 0 187 (43 ) 144 (217 ) 144 0 (73 ) Retirement obligation 0 (695 ) 695 (159 ) 536 (32,590 ) 536 0 (32,054 ) Total $ 61,056 $ (910 ) $ 61,966 $ (13,271 ) $ 48,695 $ (44,408 ) $ 48,695 $ 906 $ 5,193 Six months ended June 30, 2018 Total other comprehensive income Total accumulated other comprehensive income (loss) (Dollars in thousands) Prior to Reclass Pre-tax Tax effect Net of tax Beginning balance Net activity Cumulative effect of new standard Ending balance Unrealized gain (loss) on debt securities $ (23,992 ) $ (30 ) $ (23,962 ) $ 5,154 $ (18,808 ) $ (182 ) $ (18,808 ) $ (190 ) $ (19,180 ) Unrealized gain (loss) on derivatives 405 0 405 (90 ) 315 (577 ) 315 (124 ) (386 ) Retirement obligation 0 (871 ) 871 (54 ) 817 (19,631 ) 817 (4,779 ) (23,593 ) Total $ (23,587 ) $ (901 ) $ (22,686 ) $ 5,010 $ (17,676 ) $ (20,390 ) $ (17,676 ) $ (5,093 ) $ (43,159 ) The following table presents the activity reclassified from accumulated other comprehensive income into income during the three and six month periods ended June 30, 2019 and 2018 , respectively: Amount reclassified from accumulated other comprehensive income (1) Three months ended Six months ended June 30, June 30, (Dollars in thousands) 2019 2018 2019 2018 Affected Line Item in the Consolidated Statements of Income Realized gain (loss) on securities available-for-sale $ (37 ) $ (30 ) $ (215 ) $ (30 ) Net gain (loss) on sales of investments securities Defined benefit pension plan Amortization of prior service cost (2) 106 103 206 206 Other noninterest expense Recognized net actuarial loss (2) (426 ) (555 ) (901 ) (1,077 ) Other noninterest expense Defined benefit pension plan total (320 ) (452 ) (695 ) (871 ) Total reclassifications for the period, before tax $ (357 ) $ (482 ) $ (910 ) $ (901 ) (1) Negative amounts are reductions to net income. (2) Included in the computation of net periodic pension cost (see Note 13 - Employee Benefit Plans for additional details).

DERIVATIVES

DERIVATIVES	6 Months Ended
	Jun. 30, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
DERIVATIVES	DERIVATIVES First Financial uses certain derivative instruments, including interest rate caps, floors and swaps, to meet the needs of its clients while managing the interest rate risk associated with certain transactions. First Financial does not use derivatives for speculative purposes. First Financial primarily utilizes interest rate swaps as a means to offer borrowers credit-based products that meet their needs. First Financial may also utilize interest rate swaps to manage the interest rate risk profile of the Company. Interest rate payments are exchanged with counterparties based on the notional amount established in the interest rate agreement. As only interest rate payments are exchanged, the cash requirements and credit risk associated with interest rate swaps are significantly less than the notional amount and the Company’s credit risk exposure is limited to the market value of the instruments. First Financial manages market value credit risk through counterparty credit policies including a review of total derivative notional position to total assets, total credit exposure to total capital and counterparty credit exposure risk. The Company is currently below all single, central clearing and portfolio limits. Client Derivatives. First Financial utilizes interest rate swaps as a means to offer commercial borrowers fixed rate funding while providing the Company with floating rate assets. The following table details the classification and amounts recognized in the Consolidated Balance Sheets for client derivatives: June 30, 2019 December 31, 2018 Estimated fair value Estimated fair value (Dollars in thousands) Balance sheet classification Notional amount Gain Loss Notional amount Gain Loss Client derivatives - instruments associated with loans Matched interest rate swaps with borrower Accrued interest and other assets $ 1,585,450 $ 66,637 $ (2,275 ) $ 1,359,990 $ 17,402 $ (11,787 ) Matched interest rate swaps with counterparty Accrued interest and other liabilities 1,585,450 2,275 (66,657 ) 1,359,990 11,787 (17,401 ) Total $ 3,170,900 $ 68,912 $ (68,932 ) $ 2,719,980 $ 29,189 $ (29,188 ) At June 30, 2019 , the Company had a total counterparty notional amount outstanding of $1.6 billion , spread among sixteen counterparties, with an outstanding liability from these contracts of $64.1 million . At December 31, 2018 , the Company had a total counterparty notional amount outstanding of $1.4 billion , spread among thirteen counterparties, with an outstanding liability from these contracts of $4.9 million . First Financial monitors its derivative credit exposure to borrowers by monitoring the creditworthiness of the related loan customers through the Company's normal credit review processes. Additionally, the Company's ALLL Committee monitors derivative credit risk exposure related to problem loans through the Company's ALLL committee. First Financial considers the market value of a derivative instrument to be part of the carrying value of the related loan for these purposes as the borrower is contractually obligated to pay First Financial this amount in the event the derivative contract is terminated. In connection with its use of derivative instruments, First Financial and its counterparties may be required to post cash collateral to offset the market position of the derivative instruments. First Financial maintains the right to offset these derivative positions with the collateral posted against them by or with the relevant counterparties. First Financial classifies the derivative cash collateral outstanding with its counterparties as an adjustment to the fair value of the derivative contracts within Accrued interest and other assets or Accrued interest and other liabilities in the Consolidated Balance Sheets. The following table discloses the gross and net amounts of client derivative liabilities recognized in the Consolidated Balance Sheets: June 30, 2019 December 31, 2018 (Dollars in thousands) Gross amounts of recognized liabilities Gross amounts offset in the Consolidated Balance Sheets Net amounts of liabilities (assets) presented in the Consolidated Balance Sheets Gross amounts of recognized liabilities Gross amounts offset in the Consolidated Balance Sheets Net amounts of liabilities (assets) presented in the Consolidated Balance Sheets Client derivatives Matched interest rate swaps with counterparty $ 68,932 $ (71,750 ) $ (2,818 ) $ 29,189 $ (14,577 ) $ 14,612 The following table details the derivative financial instruments, the average remaining maturities and the weighted-average interest rates being paid and received by First Financial at June 30, 2019 : Weighted-average rate (Dollars in thousands) Notional amount Average maturity (years) Fair value Receive Pay Client derivatives Receive fixed, matched interest rate swaps with borrower $ 1,585,450 6.2 $ 64,362 4.69 % 4.66 % Pay fixed, matched interest rate swaps with counterparty 1,585,450 6.2 (64,382 ) 4.66 % 4.69 % Total client derivatives $ 3,170,900 6.2 $ (20 ) 4.68 % 4.68 % Credit Derivatives. In conjunction with participating interests in commercial loans, First Financial periodically enters into risk participation agreements with counterparties whereby First Financial assumes a portion of the credit exposure associated with an interest rate swap on the participated loan in exchange for a fee. Under these agreements, First Financial will make payments to the counterparty if the loan customer defaults on its obligation to perform under the interest rate swap contract with the counterparty. The total notional value of these agreements totaled $155.6 million as of June 30, 2019 and $138.4 million as of December 31, 2018 . The fair value of these agreements is recorded in Accrued interest and other liabilities on the Consolidated Balance Sheets and was $0.3 million at June 30, 2019 and $0.1 million at December 31, 2018 . Mortgage Derivatives. First Financial enters into IRLCs and forward commitments for the future delivery of mortgage loans to third party investors, which are considered derivatives. When borrowers secure an IRLC with First Financial and the loan is intended to be sold, First Financial will enter into forward commitments for the future delivery of the loans to third party investors in order to hedge against the effect of changes in interest rates impacting IRLCs and loans held for sale. At June 30, 2019 , the notional amount of the IRLCs was $52.8 million and the notional amount of forward commitments was $52.8 million . As of December 31, 2018 , the notional amount of IRLCs was $20.8 million and the notional amount of forward commitments was $12.3 million . The fair value of these agreements was insignificant at both June 30, 2019 and December 31, 2018 and was recorded in Accrued interest and other assets on the Consolidated Balance Sheets.

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	6 Months Ended
	Jun. 30, 2019
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES First Financial offers a variety of financial instruments including letters of credit and outstanding commitments to extend credit to assist clients in meeting their requirement for liquidity and credit enhancement. GAAP does not require these financial instruments to be recorded in the Consolidated Financial Statements. First Financial utilizes the same credit policies in issuing commitments and conditional obligations as it does for credit instruments recorded on the Consolidated Balance Sheets. First Financial’s exposure to credit loss in the event of non-performance by the counterparty is represented by the contractual amounts of those instruments. First Financial utilizes the ALLL methodology to maintain a reserve that it considers sufficient to absorb probable incurred losses incurred in letters of credit and outstanding loan commitments. First Financial had $0.6 million and $0.7 million of reserves for unfunded commitments recorded in Accrued interest and other liabilities on the Consolidated Balance Sheets as of June 30, 2019 and December 31, 2018 , respectively. Loan commitments. Loan commitments are agreements to extend credit to a client, absent any violation of conditions established in the commitment agreement. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. The amount of collateral obtained, if deemed necessary by First Financial upon extension of credit, is based on management’s credit evaluation of the client. The collateral held varies, but may include securities, real estate, inventory, plant or equipment. First Financial had commitments outstanding to extend credit totaling $3.3 billion and $3.0 billion at June 30, 2019 and December 31, 2018 , respectively. As of June 30, 2019 , loan commitments with a fixed interest rate totaled $188.4 million while commitments with variable interest rates totaled $3.1 billion . At December 31, 2018 , loan commitments with a fixed interest rate totaled $174.0 million while commitments with variable interest rates totaled $2.9 billion . First Financial's fixed rate loan commitments have interest rates ranging from 0.00% to 21.00% and maturities ranging from less than 1 year to 30 years for both June 30, 2019 and December 31, 2018 . Letters of credit. Letters of credit are conditional commitments issued by First Financial to guarantee the performance of a client to a third party. First Financial’s letters of credit consist of performance assurances made on behalf of clients who have a contractual commitment to produce or deliver goods or services. The risk to First Financial arises from its obligation to make payment in the event of the client's contractual default to produce the contracted good or service to a third party. First Financial issued letters of credit aggregating $32.5 million and $32.7 million at June 30, 2019 and December 31, 2018 , respectively. Management conducts regular reviews of these instruments on an individual client basis. Investments in affordable housing tax credits. First Financial has made investments in certain qualified affordable housing tax credits. These credits are an indirect federal subsidy that provide tax incentives to encourage investment in the development, acquisition and rehabilitation of affordable rental housing, and allow investors to claim tax credits and other tax benefits (such as deductions from taxable income for operating losses) on their federal income tax returns. The principal risk associated with qualified affordable housing investments is the potential for noncompliance with the tax code requirements, such as failure to rent property to qualified tenants, resulting in the unavailability or recapture of the tax credits and other tax benefits. Investments in affordable housing projects are accounted for under the proportional amortization method and are included in Accrued interest and other assets in the Consolidated Balance Sheets. First Financial's affordable housing commitments totaled $33.5 million and $39.4 million as of June 30, 2019 and December 31, 2018 , respectively. The Company recognized tax credits of $1.6 million and $1.2 million for the three months ended June 30, 2019 and 2018 , respectively and $3.2 million and $2.3 million for the six months ended June 30, 2019 and 2018 , respectively. The Company recognized amortization expense which was included in income tax expense of $2.1 million and $1.6 million for the three months ended June 30, 2019 and 2018 , respectively and $3.8 million and $2.8 million for the six months ended June 30, 2019 and 2018, respectively. First Financial had no affordable housing contingent commitments as of June 30, 2019 or December 31, 2018 . Investments in historic tax credits. First Financial has noncontrolling financial investments in private investment funds and partnerships which are not consolidated. These investments may generate a return through the realization of federal and state income tax credits, as well as other tax benefits, such as tax deductions from net operating losses of the investments over a period of time. Investments in historic tax credits are accounted for under the equity method of accounting and are carried in Accrued interest and other assets on the Consolidated Balance Sheets. The Company’s recorded investment in these entities was approximately $3.7 million at June 30, 2019 and $3.9 million at December 31, 2018 . The maximum exposure to loss related to these investments was $3.7 million at June 30, 2019 and $3.9 million at December 31, 2018 , representing the Company’s investment balance and its unfunded commitments to invest additional amounts. Investments in historic tax credits resulted in $0.1 million tax credits for both three month periods ended June 30, 2019 and June 30, 2018 , and $0.1 million and $0.2 million for the six months ended June 30, 2019 and June 30, 2018 , respectively. Contingencies/Litigation. First Financial and its subsidiaries are engaged in various matters of litigation from time to time, and have a number of unresolved claims pending. Additionally, as part of the ordinary course of business, First Financial and its subsidiaries are parties to litigation involving claims to the ownership of funds in particular accounts, the collection of delinquent accounts, challenges to security interests in collateral and foreclosure interests that are incidental to our regular business activities. While the ultimate liability with respect to these litigation matters and claims cannot be determined at this time, First Financial believes that damages, if any, and other amounts relating to pending matters are not probable or cannot be reasonably estimated as of June 30, 2019 . Reserves are established for these various matters of litigation, when appropriate, under FASB ASC Topic 450, Contingencies, based in part upon the advice of legal counsel. First Financial had no reserves related to litigation matters as of June 30, 2019 or December 31, 2018 .

INCOME TAXES

INCOME TAXES	6 Months Ended
	Jun. 30, 2019
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES For the second quarter 2019 , income tax expense was $13.2 million , resulting in an effective tax rate of 20.0% compared with income tax expense of $9.3 million and an effective income tax rate of 20.4% for the comparable period in 2018. For the first six months of 2019, income tax expense was $23.1 million , resulting in an effective tax rate of 19.0% compared with income tax expense of $17.0 million and an effective tax rate of 20.2% for the comparable period in 2018. The decrease in the effective tax rate is primarily due to favorable resolution of an uncertain state tax position and favorable tax reform guidance related to the treatment of acquired BOLI and stock compensation activity, which was partially offset by an increase in non-deductible executive compensation. At June 30, 2019 and December 31, 2018 , First Financial had $2.4 million and $2.9 million , respectively, of unrecognized tax benefits, as determined in FASB ASC Topic 740-10, Income Taxes, that if recognized would favorably impact the effective income tax rate in future periods. The unrecognized tax benefits relate to state income tax exposures from taking tax positions where the Company believes it is likely that, upon examination, a state may take a position contrary to the position taken by First Financial. The Company believes that resolution regarding our uncertain tax positions is reasonably possible within the next twelve months and could result in full, partial or no recognition of the benefit. First Financial recognizes interest accrued related to unrecognized tax benefits and penalties as income tax expense. At June 30, 2019 and December 31, 2018 , the Company had no interest or penalties recorded. First Financial and its subsidiaries are subject to U.S. federal income tax as well as state and local income tax in several jurisdictions. Tax years prior to 2015 have been closed and are no longer subject to U.S. federal income tax examinations. Tax years 2015 through 2018 remain open to examination by the federal taxing authority. First Financial is no longer subject to state and local income tax examinations for years prior to 2011. Tax years 2011 through 2018 remain open to state and local examination in various jurisdictions.

EMPLOYEE BENEFIT PLANS

EMPLOYEE BENEFIT PLANS	6 Months Ended
	Jun. 30, 2019
Retirement Benefits [Abstract]
EMPLOYEE BENEFIT PLANS	EMPLOYEE BENEFIT PLANS First Financial sponsors a non-contributory defined benefit pension plan which covers substantially all employees and uses a December 31 measurement date for the plan. Plan assets were primarily invested in fixed income and publicly traded equity mutual funds. The pension plan does not directly own any shares of First Financial common stock or any other First Financial security or product. First Financial made no cash contributions to fund the pension plan during the six months ended June 30, 2019 , or the year ended December 31, 2018, and does not expect to make cash contributions to the plan through the remainder of 2019. As a result of the plan’s actuarial projections, which included consideration of the impact of the merger with MSFG, First Financial recorded expense as set forth in the following table. The amounts are recognized in First Financial’s Consolidated Statements of Income related to the Company's pension plan. Three months ended Six months ended June 30, June 30, (Dollars in thousands) 2019 2018 2019 2018 Service cost $ 1,545 $ 1,735 $ 3,295 $ 3,030 Interest cost 689 601 1,389 1,191 Expected return on assets (2,409 ) (2,450 ) (4,859 ) (4,910 ) Amortization of prior service cost (106 ) (103 ) (206 ) (206 ) Net actuarial loss 426 555 901 1,077 Net periodic benefit cost (income) $ 145 $ 338 $ 520 $ 182

REVENUE RECOGNITION

REVENUE RECOGNITION	6 Months Ended
	Jun. 30, 2019
Revenue Recognition [Abstract]
REVENUE RECOGNITION	REVENUE RECOGNITION The majority of the Company's revenues come from interest income and other sources, including loans, leases, securities and derivatives, that are outside the scope of ASU No. 2014-09, Revenue from Contracts with Customers. The Company's services that fall within the scope of ASU 2019-09 are presented within Noninterest income and are recognized as revenue as the Company satisfies its obligation to the customer. Services within the scope of this guidance include service charges on deposits, trust and wealth management fees, bankcard income, gain/loss on the sale of OREO and investment brokerage fees. Service charges on deposit accounts. The Company earns fees from its deposit customers for transaction-based, account maintenance and overdraft services. Transaction-based fees, which include services such as ATM use fees, stop payment charges, statement rendering and ACH fees, are recognized at the time the transaction is executed as that is the point in time the Company fulfills the customer's request. Account maintenance fees, which relate primarily to monthly maintenance, are earned over the course of a month, representing the period over which the Company satisfies the performance obligation. Similarly, overdraft fees are recognized at the point in time that the overdraft occurs as this corresponds with the Company's performance obligation. Service charges on deposit accounts are withdrawn from the customer's account balance. Trust and wealth management fees. Trust and wealth management fees are primarily asset-based, but can also include flat fees based upon a specific service rendered, such as tax preparation services. The Company’s performance obligation is generally satisfied over time and the resulting fees are recognized monthly, based upon the month-end market value of the assets under management and the applicable fees. The Company does not earn performance-based incentives. Optional services such as real estate sales and tax return preparation services are also available to existing trust and wealth management customers. The Company’s performance obligation for these transactional-based services is generally satisfied, and related revenue recognized, as incurred. Bankcard income. The Company earns interchange fees from cardholder transactions conducted through the Visa payment network. Interchange fees from cardholder transactions represent a percentage of the underlying transaction value and are recognized concurrent with the transaction processing services provided to the cardholder. Interchange income is presented on the Consolidated Statements of Income net of expenses. Gross interchange income for the second quarter of 2019 was $6.7 million , which was partially offset by $2.1 million of expenses within Noninterest income. Gross interchange income for the second quarter of 2018 was $8.1 million , which was partially offset by $2.8 million of expenses. Gross interchange income for the first six months of 2019 was $15.2 million , which was partially offset by $5.0 million of expenses within Noninterest income. Gross interchange income for the first six months of 2018 was $13.5 million , which was partially offset by $4.8 million of expenses. Other. Other noninterest income consists of other recurring revenue streams such as transaction fees, safe deposit rental income, insurance commissions, merchant referral income, gain (loss) on sale of OREO and brokerage revenue. Transaction fees primarily include check printing sales commissions, collection fees and wire transfer fees which arise from in-branch transactions. Safe deposit rental income arises from services charged to the customer on an annual basis and recognized upon receipt of payment. Insurance commissions are agent commissions earned by the Company and earned upon the effective date of the bound coverage. Merchant referral income is associated with a program whereby the Company receives a share of processing revenue that is generated from clients that were referred by First Financial to the service provider. Revenue is recognized at the point in time when the transaction occurs. The Company records a gain or loss from the sale of OREO when control of the property transfers to the buyer, which generally occurs at the time of the executed deed. When the Company finances the sale of OREO to the buyer, the Company assesses whether the buyer is committed to perform their obligations under the contract and whether collectibility of the transaction price is probable. Once these criteria are met, the OREO asset is derecognized and the gain or loss on sale is recorded upon the transfer of control of the property to the buyer. Brokerage revenue represents fees from investment brokerage services provided to customers by a third party provider. The Company receives commissions from the third-party service provider on a monthly basis based upon customer activity for the month. The fees are recognized monthly and a receivable is recorded until commissions are paid the following month. Because the Company (i) acts as an agent in arranging the relationship between the customer and the third-party service provider and (ii) does not control the services rendered to the customers, investment brokerage fees are presented net of related costs.

EARNINGS PER COMMON SHARE

EARNINGS PER COMMON SHARE	6 Months Ended
	Jun. 30, 2019
Earnings Per Share [Abstract]
EARNINGS PER COMMON SHARE	EARNINGS PER COMMON SHARE The following table sets forth the computation of basic and diluted earnings per share: Three months ended Six months ended June 30, June 30, (Dollars in thousands, except per share data) 2019 2018 2019 2018 Numerator Net income available to common shareholders $ 52,703 $ 36,418 $ 98,542 $ 66,924 Denominator Basic earnings per common share - weighted average shares 98,083,799 97,347,533 98,005,379 79,599,709 Effect of dilutive securities Employee stock awards 564,585 545,374 537,568 504,914 Warrants 0 539,165 0 524,872 Diluted earnings per common share - adjusted weighted average shares 98,648,384 98,432,072 98,542,947 80,629,495 Earnings per share available to common shareholders Basic $ 0.54 $ 0.37 $ 1.01 $ 0.84 Diluted $ 0.53 $ 0.37 $ 1.00 $ 0.83 First Financial had no warrants outstanding to purchase the Company's common stock as of June 30, 2019 . Warrants acquired in the MSFG merger were outstanding as of December 31, 2018 and were exercised in January 2019. At June 30, 2018, First Financial had warrants outstanding representing the right to purchase 22,698 shares of common stock at an exercise price of $12.11 per share and all unexercised warrants expired in December 2018. Stock options and warrants with exercise prices greater than the average market price of the common shares were not included in the computation of net income per diluted share, as they would have been antidilutive. Using the end of period price of the Company's common shares, there were no antidilutive options at June 30, 2019 and June 30, 2018

FAIR VALUE DISCLOSURES

FAIR VALUE DISCLOSURES	6 Months Ended
	Jun. 30, 2019
Fair Value Disclosures [Abstract]
FAIR VALUE DISCLOSURES	FAIR VALUE DISCLOSURES The fair value framework as disclosed in the Fair Value Topic includes a hierarchy which focuses on prioritizing the inputs used in valuation techniques. The fair value hierarchy gives the highest priority to quoted prices in active markets for identical assets or liabilities (Level 1), a lower priority to observable inputs other than quoted prices in active markets for identical assets and liabilities (Level 2) and the lowest priority to unobservable inputs (Level 3). When determining the fair value measurements for assets and liabilities, First Financial looks to active markets to price identical assets or liabilities whenever possible and classifies such items in Level 1. When identical assets and liabilities are not traded in active markets, First Financial looks to observable market data for similar assets and liabilities and classifies such items as Level 2. Certain assets and liabilities are not actively traded in observable markets and First Financial must use alternative techniques, based on unobservable inputs, to determine the fair value and classifies such items as Level 3. The level within the fair value hierarchy is based on the lowest level of input that is significant in the fair value measurement. The estimated fair values of First Financial’s financial instruments not measured at fair value on a recurring or nonrecurring basis in the consolidated financial statements were as follows: Carrying Estimated fair value (Dollars in thousands) value Total Level 1 Level 2 Level 3 June 30, 2019 Financial assets Cash and short-term investments $ 271,362 $ 271,362 $ 271,362 $ 0 $ 0 Investment securities held-to-maturity 154,327 153,039 0 153,039 0 Other investments 127,439 N/A N/A N/A N/A Loans held for sale 20,244 20,244 0 20,244 0 Loans and leases 8,919,237 8,850,385 0 0 8,850,385 Accrued interest receivable 44,474 44,474 0 14,287 30,187 Financial liabilities Deposits 10,109,004 10,102,924 0 10,102,924 0 Short-term borrowings 1,313,321 1,313,321 1,313,321 0 0 Long-term debt 547,042 545,983 0 545,983 0 Accrued interest payable 12,730 12,730 2,859 9,871 0 Carrying Estimated fair value (Dollars in thousands) value Total Level 1 Level 2 Level 3 December 31, 2018 Financial assets Cash and short-term investments $ 273,959 $ 273,959 $ 273,959 $ 0 $ 0 Investment securities held-to-maturity 429,328 424,118 0 424,118 0 Other investments 115,660 N/A N/A N/A N/A Loans held for sale 4,372 4,372 0 4,372 0 Loans and leases 8,767,672 8,662,868 0 0 8,662,868 Accrued interest receivable 41,816 41,816 0 13,819 27,997 Financial liabilities Deposits 10,140,394 10,113,475 0 10,113,475 0 Short-term borrowings 1,040,691 1,040,691 1,040,691 0 0 Long-term debt 570,739 557,933 0 557,933 0 Accrued interest payable 12,126 12,126 2,035 10,091 0 In accordance with our adoption of ASU 2016-01 in 2018, the methods utilized to measure the fair value of financial instruments at June 30, 2019 and December 31, 2018 represent an approximation of exit price, however, an actual exit price may differ. The following methods, assumptions and valuation techniques were used by First Financial to measure different financial assets and liabilities at fair value on a recurring or nonrecurring basis. Investment securities. Investment securities classified as available-for-sale are recorded at fair value on a recurring basis. Fair value measurement is based upon quoted market prices, when available (Level 1). If quoted market prices are not available, fair values are measured utilizing independent valuation techniques of identical or similar investment securities. First Financial compiles prices from various sources who may apply such techniques as matrix pricing to determine the value of identical or similar investment securities (Level 2). Matrix pricing is a mathematical technique widely used in the banking industry to value investment securities without relying exclusively on quoted prices for the specific investment securities but rather relying on the investment securities’ relationship to other benchmark quoted investment securities. Any investment securities not valued based upon the methods previously described are considered Level 3. First Financial utilizes values provided by third-party pricing vendors to price the investment securities portfolio in accordance with the fair value hierarchy of the Fair Value Topic and reviews the pricing methodologies utilized by the pricing vendors to ensure that the fair value determination is consistent with the applicable accounting guidance. First Financial’s pricing process includes a series of quality assurance activities where prices are compared to recent market conditions, historical prices and other independent pricing services. Further, the Company periodically validates the fair value of a sample of securities in the portfolio by comparing the fair values to prices from other independent sources for the same or similar securities. First Financial analyzes unusual or significant variances, conducts additional research with the pricing vendor, and if necessary, takes appropriate action based on its findings. The results of the quality assurance process are incorporated into the selection of pricing providers by the portfolio manager. Impaired loans. The fair value of impaired loans are specifically reviewed for purposes of determining the appropriate amount of impairment to be allocated to the ALLL. Fair value is generally measured based on the value of the collateral securing the loans. Collateral may be in the form of real estate or business assets including equipment, inventory and accounts receivable. The value of real estate collateral is determined utilizing an income or market valuation approach based on an appraisal conducted by an independent, licensed third-party appraiser (Level 3). The value of business equipment is based on an outside appraisal, if deemed significant, or the net book value on the applicable borrower financial statements. Likewise, values for inventory and accounts receivable collateral are based on borrower financial statement balances or aging reports on a discounted basis as appropriate (Level 3). Impaired loans are measured at fair value on a nonrecurring basis. Any fair value adjustments are recorded in the period incurred as provision for loan and lease losses on the Consolidated Statements of Income. OREO. Assets acquired through loan foreclosure are recorded at fair value less costs to sell, with any difference between the fair value of the property and the carrying value of the loan recorded as a charge-off. If the fair value is higher than the carrying amount of the loan, the excess is recognized first as a recovery and then as noninterest income. Subsequent changes in value are reported as adjustments to the carrying amount and are recorded in noninterest expense. The carrying value of OREO is not re-measured to fair value on a recurring basis, but is subject to fair value adjustments when the carrying value differs from the fair value, less estimated selling costs. Fair value is based on recent real estate appraisals and is updated at least annually. The Company classifies OREO in level 3 of the fair value hierarchy. Derivatives. The fair values of derivative instruments are based primarily on a net present value calculation of the cash flows related to the interest rate swaps at the reporting date, using primarily observable market inputs such as interest rate yield curves which represents the cost to terminate the swap if First Financial should choose to do so. Additionally, First Financial utilizes an internally-developed model to value the credit risk component of derivative assets and liabilities, which is recorded as an adjustment to the fair value of the derivative asset or liability on the reporting date. Derivative instruments are classified as Level 2 in the fair value hierarchy. The financial assets and liabilities measured at fair value on a recurring basis in the consolidated financial statements were as follows: Fair value measurements using (Dollars in thousands) Level 1 Level 2 Level 3 Assets/liabilities at fair value June 30, 2019 Assets Derivatives $ 0 $ 69,038 $ 0 $ 69,038 Investment securities available-for-sale 100 3,140,072 12,798 3,152,970 Total $ 100 $ 3,209,110 $ 12,798 $ 3,222,008 Liabilities Derivatives $ 0 $ 69,470 $ 0 $ 69,470 Fair value measurements using (Dollars in thousands) Level 1 Level 2 Level 3 Assets/liabilities at fair value December 31, 2018 Assets Derivatives $ 0 $ 29,543 $ 0 $ 29,543 Investment securities available-for-sale 97 2,764,443 14,715 2,779,255 Total $ 97 $ 2,793,986 $ 14,715 $ 2,808,798 Liabilities Derivatives $ 0 $ 29,336 $ 0 $ 29,336 The following table presents a reconciliation for certain AFS securities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the three months ended June 30, 2019 . No AFS securities were measured at fair value on a recurring basis for the three or six months ended June 30, 2018. Three months ended Six months ended (dollars in thousands) June 30, 2019 June 30, 2019 Beginning balance $ 13,355 $ 14,715 Accretion (amortization) (569 ) (562 ) Increase (decrease) in fair value 12 33 Settlements 0 (1,388 ) Ending balance $ 12,798 $ 12,798 Certain financial assets and liabilities are measured at fair value on a nonrecurring basis. Adjustments to the fair market value of these assets usually result from the application of fair value accounting or write-downs of individual assets. The following table summarizes financial assets and liabilities measured at fair value on a nonrecurring basis. Fair value measurements using (Dollars in thousands) Level 1 Level 2 Level 3 June 30, 2019 Assets Impaired loans $ 0 $ 0 $ 4,398 OREO 0 0 953 Fair value measurements using (Dollars in thousands) Level 1 Level 2 Level 3 December 31, 2018 Assets Impaired loans $ 0 $ 0 $ 1,320 OREO 0 0 1,089

BUSINESS COMBINATIONS

BUSINESS COMBINATIONS	6 Months Ended
	Jun. 30, 2019
Business Combinations [Abstract]
BUSINESS COMBINATIONS	BUSINESS COMBINATIONS On June 18, 2019, the Company entered into an agreement to acquire Bannockburn Global Forex, LLC. Pursuant to the agreement, First Financial agreed to acquire all of the issued and outstanding membership interests of BGF for aggregate consideration of approximately $117.0 million in cash and First Financial common stock. BGF is a privately held capital markets trading firm specializing in foreign currency advisory, hedge analytics, and transaction processing for closely held enterprises. Upon completion of the transaction, Bannockburn will become a division of the Bank, but will continue to operate as Bannockburn Global Forex, taking advantage of its existing brand recognition within the foreign exchange industry. The transaction is expected to close in the third quarter of 2019, subject to various regulatory approvals and other closing conditions. On April 1, 2018, the Company completed its acquisition of MainSource Financial Group, Inc. and its banking subsidiary, MainSource Bank. Therefore, results of MSFG have been included in the results of operations beginning on April 1, 2018. Under the terms of the merger agreement, shareholders of MSFG received 1.3875 common shares of First Financial common stock for each share of MSFG common stock, with cash paid in lieu of fractional shares. Including outstanding options and warrants to purchase MSFG common stock, the total purchase consideration was $1.1 billion and resulted in goodwill of $675.6 million . The goodwill arising from the acquisition largely reflected synergies and cost savings resulting from combining the operations of the companies. First Financial incurred merger related expenses related to the acquisition of MSFG of $0.8 million for the second quarter of 2019, $2.4 million for the first six months of 2019 and $37.8 million during the year ended December 31, 2018. The acquisition provides additional revenue growth and diversification. The goodwill is not deductible for income tax purposes as the transaction was accounted for as a tax-free exchange. For further detail, see Note 6 – Goodwill and Other Intangible Assets. The MainSource transaction was 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, in accordance with FASB ASC Topic 805, Business Combinations. The fair value measurements of assets acquired and liabilities assumed were subject to refinement for up to one year after the closing date of the acquisition as additional information relative to closing date fair values became available. The fair values of assets acquired and liabilities assumed were considered final as of March 31, 2019. The following table provides the purchase price calculation as of the acquisition date, identifiable assets purchased and liabilities assumed at their estimated fair value. As a condition of the merger, certain acquired assets and liabilities held for sale were divested subsequent to the closing of the merger. There was no gain or loss recorded in the Consolidated Statement of Income in conjunction with this divestiture. (Dollars in thousands) MainSource Purchase consideration Cash consideration $ 43 Stock consideration 1,043,424 Warrant consideration 14,460 Options consideration 1,577 Total purchase consideration 1,059,504 Assets acquired Cash 71,806 Investment securities available-for-sale 900,935 Investment securities held-to-maturity 171,423 Other investments 28,763 Loans 2,792,572 Premises and equipment 98,814 Intangible assets 42,887 Other assets 167,829 Assets held for sale 127,775 Total assets acquired 4,402,804 Liabilities assumed Deposits 3,263,920 Subordinated notes 49,027 FHLB advances 291,887 Other borrowings 205,620 Other liabilities 32,649 Liabilities held for sale 175,840 Total liabilities assumed 4,018,943 Net identifiable assets 383,861 Goodwill $ 675,643 The fair value of net assets acquired includes fair value adjustments to certain loans that were not considered impaired as of the acquisition date as the Company believes that all contractual cash flows will be collected. The fair value adjustments were determined using discounted cash flows. In conjunction with the MSFG merger, First Financial acquired loans with a fair value and gross contractual amounts receivable of $2.8 billion and $2.9 billion on the date of acquisition. The following table presents supplemental pro forma information as if the MSFG acquisition had occurred at the beginning of 2017. The pro forma information includes adjustments for interest income on acquired loans, amortization of intangible assets arising from the transaction, depreciation expense on property acquired, interest expense on deposits acquired, merger-related expenses incurred and the related income tax effects. The pro forma financial information is not necessarily indicative of the results of operations that would have occurred had the transactions been effected on the assumed date. The disclosures regarding the results of operations for MSFG subsequent to its acquisition date are omitted as this information is not practical to obtain. Twelve months ended December 31, (Dollars in thousands, except per share data) 2018 2017 Pro Forma Condensed Combined Income Statement Information Net interest income $ 484,915 $ 454,579 Net income 221,122 130,402 Basic earnings per share 2.27 1.34 Diluted earnings per share 2.25 1.33

SUMMARY OF SIGNIFICANT ACCOUNTI

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	6 Months Ended
	Jun. 30, 2019
Off-Balance-Sheet Credit Exposure, Policy [Policy Text Block]	Letters of credit are conditional commitments issued by First Financial to guarantee the performance of a client to a third party.  First Financial’s letters of credit consist of performance assurances made on behalf of clients who have a contractual commitment to produce or deliver goods or services.  The risk to First Financial arises from its obligation to make payment in the event of the client's contractual default to produce the contracted good or service to a third party.
Basis of Presentation Policy	The Consolidated Financial Statements of First Financial Bancorp., a financial holding company principally serving Ohio, Indiana, Kentucky and Illinois, include the accounts and operations of First Financial and its wholly-owned subsidiary, First Financial Bank. All significant intercompany transactions and accounts have been eliminated in consolidation. Certain reclassifications of prior periods' amounts have been made to conform to current year presentation. Such reclassifications had no effect on net earnings.
Use of Estimates, Policy	The preparation of financial statements in conformity with GAAP requires management to make estimates, assumptions and judgments that affect the amounts reported in the Consolidated Financial Statements and accompanying Notes. These estimates, assumptions and judgments are inherently subjective and may be susceptible to significant change. Actual realized amounts could differ materially from these estimates.
Loans and Leases Receivable, Past Due Status, Policy	Loans are considered past due or delinquent when the contractual principal or interest due in accordance with the terms of the loan agreement remains unpaid after the date of the scheduled payment.
Loans and Leases Receivable, Nonaccrual Loan and Lease Status, Policy	Loans are classified as nonaccrual when, in the opinion of management, collection of principal or interest is doubtful or when principal or interest payments are 90 days or more past due. Generally, loans are classified as nonaccrual due to the continued failure to adhere to contractual payment terms by the borrower, coupled with other pertinent factors. When a loan is classified as nonaccrual, the accrual of interest income is discontinued and previously accrued but unpaid interest is reversed. Any payments received while a loan is on nonaccrual status are applied as a reduction to the carrying value of the loan. A loan classified as nonaccrual may return to accrual status if none of the principal and interest is due and unpaid, and the Bank expects repayment of the remaining contractual principal and interest. Purchased impaired loans are classified as performing, even though they may be contractually past due, as any nonpayment of contractual principal or interest is considered in the periodic re-estimation of expected cash flows and is included in the resulting recognition of current period provision for loan and lease losses or prospective yield adjustments.
Loans and Leases Receivable, Troubled Debt Restructuring Policy	A loan modification is considered a TDR when the borrower is experiencing financial difficulty and concessions are made by the Company that would not otherwise be considered for a borrower with similar credit characteristics. The most common types of modifications include interest rate reductions, maturity extensions and modifications to principal amortization, including interest-only structures. Modified terms are dependent upon the financial position and needs of the individual borrower. If the modification agreement is violated, the loan is managed by the Company’s credit administration group for resolution, which may result in foreclosure in the case of real estate.
Impaired Financing Receivable, Policy	First Financial individually reviews all impaired commercial loan relationships, as well as consumer loan TDRs greater than $250,000
Loans and Leases Receivable, Real Estate Acquired Through Foreclosure, Policy	OREO consists of properties acquired by the Company primarily through the loan foreclosure or repossession process, that results in partial or total satisfaction of problem loans.
Loans and Leases Receivable, Allowance for Loan Losses Policy	Management maintains the ALLL at a level that it considers sufficient to absorb probable incurred loan and lease losses inherent in the portfolio. Management determines the adequacy of the ALLL based on historical loss experience as well as other significant factors such as composition of the portfolio, economic conditions, geographic footprint, the results of periodic internal and external evaluations of delinquent, nonaccrual and classified loans and any other adverse situations that may affect a specific borrower's ability to repay, including the timing of future payments. The ALLL is increased by provision expense and decreased by charge-offs, net of recoveries of amounts previously charged-off. First Financial's policy is to charge-off all or a portion of a loan when, in management's opinion, it is unlikely to collect the principal amount owed in full either through payments from the borrower or from the liquidation of collateral.
Goodwill and Intangible Assets, Goodwill, Policy	Assets and liabilities acquired in a business combination are recorded at their estimated fair values as of the acquisition date. The excess cost of the acquisition over the fair value of net assets acquired is recorded as goodwill.
Goodwill and Intangible Assets, Goodwill Impairment Policy	Goodwill is evaluated for impairment on an annual basis as of October 1 of each year, or whenever events or changes in circumstances indicate that the fair value of a reporting unit may be below its carrying value.
Goodwill and Intangible Assets, Policy	Core deposit intangibles represent the estimated fair value of acquired customer deposit relationships on the date of acquisition and are amortized on an accelerated basis
Income Tax, Policy	The unrecognized tax benefits relate to state income tax exposures from taking tax positions where the Company believes it is likely that, upon examination, a state may take a position contrary to the position taken by First Financial.
Commitments and Contingencies, Policy	First Financial offers a variety of financial instruments including letters of credit and outstanding commitments to extend credit to assist clients in meeting their requirement for liquidity and credit enhancement. GAAP does not require these financial instruments to be recorded in the Consolidated Financial Statements.
Fair Value Measurement, Policy [Policy Text Block]	The fair value framework as disclosed in the Fair Value Topic includes a hierarchy which focuses on prioritizing the inputs used in valuation techniques. The fair value hierarchy gives the highest priority to quoted prices in active markets for identical assets or liabilities (Level 1), a lower priority to observable inputs other than quoted prices in active markets for identical assets and liabilities (Level 2) and the lowest priority to unobservable inputs (Level 3). When determining the fair value measurements for assets and liabilities, First Financial looks to active markets to price identical assets or liabilities whenever possible and classifies such items in Level 1. When identical assets and liabilities are not traded in active markets, First Financial looks to observable market data for similar assets and liabilities and classifies such items as Level 2. Certain assets and liabilities are not actively traded in observable markets and First Financial must use alternative techniques, based on unobservable inputs, to determine the fair value and classifies such items as Level 3. The level within the fair value hierarchy is based on the lowest level of input that is significant in the fair value measurement.
Fair Value of Financial Instruments, Policy	The following methods, assumptions and valuation techniques were used by First Financial to measure different financial assets and liabilities at fair value on a recurring or nonrecurring basis. Investment securities. Investment securities classified as available-for-sale are recorded at fair value on a recurring basis. Fair value measurement is based upon quoted market prices, when available (Level 1). If quoted market prices are not available, fair values are measured utilizing independent valuation techniques of identical or similar investment securities. First Financial compiles prices from various sources who may apply such techniques as matrix pricing to determine the value of identical or similar investment securities (Level 2). Matrix pricing is a mathematical technique widely used in the banking industry to value investment securities without relying exclusively on quoted prices for the specific investment securities but rather relying on the investment securities’ relationship to other benchmark quoted investment securities. Any investment securities not valued based upon the methods previously described are considered Level 3. First Financial utilizes values provided by third-party pricing vendors to price the investment securities portfolio in accordance with the fair value hierarchy of the Fair Value Topic and reviews the pricing methodologies utilized by the pricing vendors to ensure that the fair value determination is consistent with the applicable accounting guidance. First Financial’s pricing process includes a series of quality assurance activities where prices are compared to recent market conditions, historical prices and other independent pricing services. Further, the Company periodically validates the fair value of a sample of securities in the portfolio by comparing the fair values to prices from other independent sources for the same or similar securities. First Financial analyzes unusual or significant variances, conducts additional research with the pricing vendor, and if necessary, takes appropriate action based on its findings. The results of the quality assurance process are incorporated into the selection of pricing providers by the portfolio manager. Impaired loans. The fair value of impaired loans are specifically reviewed for purposes of determining the appropriate amount of impairment to be allocated to the ALLL. Fair value is generally measured based on the value of the collateral securing the loans. Collateral may be in the form of real estate or business assets including equipment, inventory and accounts receivable. The value of real estate collateral is determined utilizing an income or market valuation approach based on an appraisal conducted by an independent, licensed third-party appraiser (Level 3). The value of business equipment is based on an outside appraisal, if deemed significant, or the net book value on the applicable borrower financial statements. Likewise, values for inventory and accounts receivable collateral are based on borrower financial statement balances or aging reports on a discounted basis as appropriate (Level 3). Impaired loans are measured at fair value on a nonrecurring basis. Any fair value adjustments are recorded in the period incurred as provision for loan and lease losses on the Consolidated Statements of Income. OREO. Assets acquired through loan foreclosure are recorded at fair value less costs to sell, with any difference between the fair value of the property and the carrying value of the loan recorded as a charge-off. If the fair value is higher than the carrying amount of the loan, the excess is recognized first as a recovery and then as noninterest income. Subsequent changes in value are reported as adjustments to the carrying amount and are recorded in noninterest expense. The carrying value of OREO is not re-measured to fair value on a recurring basis, but is subject to fair value adjustments when the carrying value differs from the fair value, less estimated selling costs. Fair value is based on recent real estate appraisals and is updated at least annually. The Company classifies OREO in level 3 of the fair value hierarchy. Derivatives. The fair values of derivative instruments are based primarily on a net present value calculation of the cash flows related to the interest rate swaps at the reporting date, using primarily observable market inputs such as interest rate yield curves which represents the cost to terminate the swap if First Financial should choose to do so. Additionally, First Financial utilizes an internally-developed model to value the credit risk component of derivative assets and liabilities, which is recorded as an adjustment to the fair value of the derivative asset or liability on the reporting date. Derivative instruments are classified as Level 2 in the fair value hierarchy.
Loan Commitments, Policy [Policy Text Block]	Loan commitments are agreements to extend credit to a client, absent any violation of conditions established in the commitment agreement.  Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee.  Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements.  The amount of collateral obtained, if deemed necessary by First Financial upon extension of credit, is based on management’s credit evaluation of the client.  The collateral held varies, but may include securities, real estate, inventory, plant or equipment.
Other Contract-Mortgage
Derivatives, Methods of Accounting, Hedging Derivatives, Policy	First Financial enters into IRLCs and forward commitments for the future delivery of mortgage loans to third party investors, which are considered derivatives. When borrowers secure an IRLC with First Financial and the loan is intended to be sold, First Financial will enter into forward commitments for the future delivery of the loans to third party investors in order to hedge against the effect of changes in interest rates impacting IRLCs and loans held for sale.
Credit Risk
Derivatives, Methods of Accounting, Hedging Derivatives, Policy	First Financial manages market value credit risk through counterparty credit policies including a review of total derivative notional position to total assets, total credit exposure to total capital and counterparty credit exposure risk. The Company is currently below all single, central clearing and portfolio limits.
Fair Value Hedges
Derivatives, Methods of Accounting, Hedging Derivatives, Policy	First Financial utilizes interest rate swaps as a means to offer commercial borrowers fixed rate funding while providing the Company with floating rate assets.

INVESTMENTS (Tables)

INVESTMENTS (Tables)	6 Months Ended
	Jun. 30, 2019
Investments, Debt and Equity Securities [Abstract]
Summary of Held-To-Maturity and Available-For-Sale Investment Securities	The following is a summary of HTM and AFS investment securities as of June 30, 2019 : Held-to-maturity Available-for-sale (Dollars in thousands) Amortized Unrecognized gain Unrecognized loss Fair Amortized cost Unrealized gain Unrealized loss Fair U.S. Treasuries $ 0 $ 0 $ 0 $ 0 $ 99 $ 1 $ 0 $ 100 Securities of U.S. government agencies and corporations 0 0 0 0 24,709 239 (139 ) 24,809 Mortgage-backed securities - residential 23,736 163 (194 ) 23,705 507,434 7,716 (1,161 ) 513,989 Mortgage-backed securities - commercial 107,810 248 (1,809 ) 106,249 482,157 5,815 (1,327 ) 486,645 Collateralized mortgage obligations 11,264 0 (181 ) 11,083 940,304 18,613 (531 ) 958,386 Obligations of state and other political subdivisions 11,517 596 (111 ) 12,002 549,546 18,991 (110 ) 568,427 Asset-backed securities 0 0 0 0 521,357 1,349 (1,605 ) 521,101 Other securities 0 0 0 0 78,546 1,336 (369 ) 79,513 Total $ 154,327 $ 1,007 $ (2,295 ) $ 153,039 $ 3,104,152 $ 54,060 $ (5,242 ) $ 3,152,970 The following is a summary of HTM and AFS investment securities as of December 31, 2018 : Held-to-maturity Available-for-sale (Dollars in thousands) Amortized Unrecognized gain Unrecognized Fair Amortized Unrealized Unrealized Fair U.S. Treasuries $ 0 $ 0 $ 0 $ 0 $ 99 $ 0 $ (2 ) $ 97 Securities of U.S. government agencies and corporations 0 0 0 0 32,095 57 (233 ) 31,919 Mortgage-backed securities - residential 25,565 0 (1,045 ) 24,520 565,071 691 (7,163 ) 558,599 Mortgage-backed securities - commercial 147,780 258 (4,385 ) 143,653 423,797 819 (3,581 ) 421,035 Collateralized mortgage obligations 12,540 0 (633 ) 11,907 928,586 4,319 (6,158 ) 926,747 Obligations of state and other political subdivisions 243,443 1,954 (1,359 ) 244,038 257,300 2,554 (1,429 ) 258,425 Asset-backed securities 0 0 0 0 511,430 611 (2,810 ) 509,231 Other securities 0 0 0 0 73,948 358 (1,104 ) 73,202 Total $ 429,328 $ 2,212 $ (7,422 ) $ 424,118 $ 2,792,326 $ 9,409 $ (22,480 ) $ 2,779,255
Summary of Investment Securities by Estimated Maturity	The following table provides a summary of investment securities by contractual maturity as of June 30, 2019 , except for residential and commercial mortgage-backed securities, collateralized mortgage obligations and asset-backed securities, which are shown as single totals due to the unpredictability of the timing in principal repayments. Held-to-maturity Available-for-sale (Dollars in thousands) Amortized cost Fair value Amortized cost Fair value By Contractual Maturity: Due in one year or less $ 0 $ 0 $ 8,322 $ 8,337 Due after one year through five years 0 0 41,902 42,607 Due after five years through ten years 4,284 4,721 156,370 160,519 Due after ten years 7,233 7,281 446,306 461,386 Mortgage-backed securities - residential 23,736 23,705 507,434 513,989 Mortgage-backed securities - commercial 107,810 106,249 482,157 486,645 Collateralized mortgage obligations 11,264 11,083 940,304 958,386 Asset-backed securities 0 0 521,357 521,101 Total $ 154,327 $ 153,039 $ 3,104,152 $ 3,152,970
Age of Gross Unrealized Losses and Associated Fair Value by Investment Category	The following tables provide the fair value and gross unrealized losses on investment securities in an unrealized loss position, aggregated by investment category and the length of time the individual securities have been in a continuous loss position: June 30, 2019 Less than 12 months 12 months or more Total (Dollars in thousands) Fair value Unrealized loss Fair Unrealized Fair Unrealized U.S. Treasuries $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 Securities of U.S. Government agencies and corporations 0 0 8,985 (139 ) 8,985 (139 ) Mortgage-backed securities - residential 10,507 (67 ) 131,539 (1,288 ) 142,046 (1,355 ) Mortgage-backed securities - commercial 99,535 (197 ) 91,179 (2,939 ) 190,714 (3,136 ) Collateralized mortgage obligations 50,381 (103 ) 94,939 (609 ) 145,320 (712 ) Obligations of state and other political subdivisions 19,676 (38 ) 14,123 (183 ) 33,799 (221 ) Asset-backed securities 218,191 (829 ) 80,710 (776 ) 298,901 (1,605 ) Other securities 6,155 (42 ) 5,424 (327 ) 11,579 (369 ) Total $ 404,445 $ (1,276 ) $ 426,899 $ (6,261 ) $ 831,344 $ (7,537 ) December 31, 2018 Less than 12 months 12 months or more Total Fair Unrealized Fair Unrealized Fair Unrealized (Dollars in thousands) value loss value loss value loss U.S. Treasuries $ 0 $ 0 $ 97 $ (2 ) $ 97 $ (2 ) Securities of U.S. Government agencies and corporations 0 0 16,777 (233 ) 16,777 (233 ) Mortgage-backed securities - residential 186,029 (935 ) 264,795 (7,273 ) 450,824 (8,208 ) Mortgage-backed securities - commercial 147,754 (369 ) 232,363 (7,597 ) 380,117 (7,966 ) Collateralized mortgage obligations 194,795 (1,546 ) 240,514 (5,245 ) 435,309 (6,791 ) Obligations of state and other political subdivisions 62,805 (299 ) 86,644 (2,489 ) 149,449 (2,788 ) Asset-backed securities 336,437 (2,312 ) 37,105 (498 ) 373,542 (2,810 ) Other securities 33,752 (884 ) 4,570 (220 ) 38,322 (1,104 ) Total $ 961,572 $ (6,345 ) $ 882,865 $ (23,557 ) $ 1,844,437 $ (29,902 )

LOANS AND LEASES (Tables)

LOANS AND LEASES (Tables)	6 Months Ended
	Jun. 30, 2019
Receivables [Abstract]
Commercial and Consumer Credit Exposure by Risk Attribute	Commercial and consumer credit exposure by risk attribute was as follows: As of June 30, 2019 Commercial Real Estate Lease (Dollars in thousands) & industrial Construction Commercial financing Total Pass $ 2,411,763 $ 497,082 $ 3,832,028 $ 87,165 $ 6,828,038 Special Mention 62,333 0 21,507 632 84,472 Substandard 73,901 601 50,119 2,841 127,462 Doubtful 0 0 0 0 0 Total $ 2,547,997 $ 497,683 $ 3,903,654 $ 90,638 $ 7,039,972 (Dollars in thousands) Residential real estate Home equity Installment Credit card Total Performing $ 999,843 $ 781,895 $ 88,954 $ 48,599 $ 1,919,291 Nonperforming 15,977 5,244 195 107 21,523 Total $ 1,015,820 $ 787,139 $ 89,149 $ 48,706 $ 1,940,814 As of December 31, 2018 Commercial Real Estate Lease (Dollars in thousands) & industrial Construction Commercial financing Total Pass $ 2,432,834 $ 548,323 $ 3,664,434 $ 90,902 $ 6,736,493 Special Mention 24,594 603 38,653 0 63,850 Substandard 57,233 9 51,594 2,513 111,349 Doubtful 0 0 0 0 0 Total $ 2,514,661 $ 548,935 $ 3,754,681 $ 93,415 $ 6,911,692 (Dollars in thousands) Residential real estate Home equity Installment Credit card Total Performing $ 939,936 $ 811,108 $ 93,038 $ 46,382 $ 1,890,464 Nonperforming 15,710 6,174 174 0 22,058 Total $ 955,646 $ 817,282 $ 93,212 $ 46,382 $ 1,912,522
Loan Delinquency, including Nonaccrual Loans	Loan delinquency, including loans classified as nonaccrual, was as follows: As of June 30, 2019 (Dollars in thousands) 30 – 59 60 – 89 > 90 days Total Current Subtotal Purchased impaired Total > 90 days Loans Commercial & industrial $ 16,749 $ 1,093 $ 11,885 $ 29,727 $ 2,513,194 $ 2,542,921 $ 5,076 $ 2,547,997 $ 0 Lease financing 0 0 0 0 90,638 90,638 0 90,638 0 Construction real estate 0 595 0 595 496,903 497,498 185 497,683 0 Commercial real estate 1,925 1,345 10,042 13,312 3,847,576 3,860,888 42,766 3,903,654 0 Residential real estate 2,313 1,393 4,713 8,419 976,923 985,342 30,478 1,015,820 0 Home equity 3,160 1,683 2,603 7,446 776,821 784,267 2,872 787,139 0 Installment 205 167 63 435 88,370 88,805 344 89,149 0 Credit card 310 186 107 603 48,103 48,706 0 48,706 107 Total $ 24,662 $ 6,462 $ 29,413 $ 60,537 $ 8,838,528 $ 8,899,065 $ 81,721 $ 8,980,786 $ 107 As of December 31, 2018 (Dollars in thousands) 30 – 59 60 – 89 > 90 days Total Current Subtotal Purchased impaired Total > 90 days Loans Commercial & industrial $ 13,369 $ 41 $ 7,423 $ 20,833 $ 2,488,450 $ 2,509,283 $ 5,378 $ 2,514,661 $ 0 Lease financing 352 0 0 352 93,063 93,415 0 93,415 0 Construction real estate 0 0 0 0 548,687 548,687 248 548,935 0 Commercial real estate 6,279 1,158 12,644 20,081 3,682,455 3,702,536 52,145 3,754,681 0 Residential real estate 11,060 2,976 4,535 18,571 902,404 920,975 34,671 955,646 0 Home equity 5,245 1,228 2,578 9,051 804,835 813,886 3,396 817,282 0 Installment 420 37 145 602 92,128 92,730 482 93,212 0 Credit card 541 96 63 700 45,682 46,382 0 46,382 63 Total $ 37,266 $ 5,536 $ 27,388 $ 70,190 $ 8,657,704 $ 8,727,894 $ 96,320 $ 8,824,214 $ 63
Loans Restructured During Period	The following tables provide information on loan modifications classified as TDRs during the three and six months ended June 30, 2019 and 2018 : Three months ended June 30, 2019 June 30, 2018 (Dollars in thousands) Number of loans Pre-modification loan balance Period end balance Number of loans Pre-modification loan balance Period end balance Commercial & industrial 1 $ 14,889 $ 14,889 8 $ 6,221 $ 6,183 Construction real estate 0 0 0 0 0 0 Commercial real estate 1 42 42 4 2,047 2,016 Residential real estate 12 2,008 1,713 1 201 201 Home equity 11 306 277 0 0 0 Installment 0 0 0 0 0 0 Total 25 $ 17,245 $ 16,921 13 $ 8,469 $ 8,400 Six months ended June 30, 2019 June 30, 2018 (Dollars in thousands) Number of loans Pre-modification loan balance Period end balance Number of loans Pre-modification loan balance Period end balance Commercial & industrial 6 $ 22,527 $ 22,550 12 $ 7,149 $ 7,096 Construction real estate 0 0 0 0 0 0 Commercial real estate 7 1,365 1,274 6 2,119 2,088 Residential real estate 17 2,466 2,171 3 294 294 Home equity 12 323 294 0 0 0 Installment 0 0 0 0 0 0 Total 42 $ 26,681 $ 26,289 21 $ 9,562 $ 9,478 For TDRs identified during the three and six months ended June 30, 2019 , there were no chargeoffs for the portion of TDRs determined to be uncollectible. For TDRs identified during the three and six months ended June 30, 2018 , there was $0.1 million chargeoffs for the portion of TDRs determined to be uncollectible.
Loans Restructured, Modifications	The following table provides information on how TDRs were modified during the three and six months ended June 30, 2019 and 2018 : Three months ended Six months ended June 30, June 30, (Dollars in thousands) 2019 2018 2019 2018 Extended maturities $ 0 $ 2,000 $ 2,877 $ 2,888 Adjusted interest rates 0 0 5,284 52 Combination of rate and maturity changes 0 0 508 0 Forbearance 15,078 6,199 15,635 6,199 Other (1) 1,843 201 1,985 339 Total $ 16,921 $ 8,400 $ 26,289 $ 9,478 (1) Includes covenant modifications and other concessions, or combination of concessions, that do not consist of interest rate adjustments, forbearance and maturity extensions
Nonaccrual, Restructured and Impaired Loans	The following table provides information on impaired loans, excluding purchased impaired loans: (Dollars in thousands) June 30, 2019 December 31, 2018 Impaired loans Nonaccrual loans (1) Commercial & industrial $ 18,502 $ 30,925 Lease financing 295 22 Construction real estate 6 9 Commercial real estate 15,981 20,500 Residential real estate 11,627 13,495 Home equity 4,745 5,580 Installment 195 169 Nonaccrual loans 51,351 70,700 Accruing troubled debt restructurings 37,420 16,109 Total impaired loans $ 88,771 $ 86,809 (1) Nonaccrual loans include nonaccrual TDRs of $11.0 million and $22.4 million as of June 30, 2019 and December 31, 2018 , respectively. Three months ended Six months ended June 30, June 30, (Dollars in thousands) 2019 2018 2019 2018 Interest income effect on impaired loans Gross amount of interest that would have been recorded under original terms $ 1,467 $ 1,132 $ 3,080 $ 1,934 Interest included in income Nonaccrual loans 192 146 527 226 Troubled debt restructurings 269 189 505 313 Total interest included in income 461 335 1,032 539 Net impact on interest income $ 1,006 $ 797 $ 2,048 $ 1,395
Investment in Impaired Loans	First Financial's investment in impaired loans was as follows: As of June 30, 2019 As of December 31, 2018 (Dollars in thousands) Current balance Contractual principal balance Related allowance Current balance Contractual Related Loans with no related allowance recorded Commercial & industrial $ 38,964 $ 41,783 $ 0 $ 36,694 $ 42,561 $ 0 Lease financing 295 295 0 22 22 0 Construction real estate 6 25 0 9 26 0 Commercial real estate 18,753 26,280 0 23,513 31,375 0 Residential real estate 14,937 17,036 0 17,297 19,975 0 Home equity 5,244 6,158 0 6,351 7,461 0 Installment 195 328 0 174 563 0 Total 78,394 91,905 0 84,060 101,983 0 Loans with an allowance recorded Commercial & industrial 8,420 8,420 4,908 939 939 667 Lease financing 0 0 0 0 0 0 Construction real estate 0 0 0 0 0 0 Commercial real estate 916 916 30 1,509 1,509 461 Residential real estate 1,041 1,041 85 301 301 32 Home equity 0 0 0 0 0 0 Installment 0 0 0 0 0 0 Total 10,377 10,377 5,023 2,749 2,749 1,160 Total Commercial & industrial 47,384 50,203 4,908 37,633 43,500 667 Lease financing 295 295 0 22 22 0 Construction real estate 6 25 0 9 26 0 Commercial real estate 19,669 27,196 30 25,022 32,884 461 Residential real estate 15,978 18,077 85 17,598 20,276 32 Home equity 5,244 6,158 0 6,351 7,461 0 Installment 195 328 0 174 563 0 Total $ 88,771 $ 102,282 $ 5,023 $ 86,809 $ 104,732 $ 1,160 First Financial's average impaired loans by class and interest income recognized by class was as follows: Three months ended June 30, 2019 June 30, 2018 (Dollars in thousands) Average Interest Average Interest Loans with no related allowance recorded Commercial & industrial $ 34,553 $ 212 $ 9,714 $ 73 Lease financing 298 0 0 0 Construction real estate 7 0 25 1 Commercial real estate 20,731 98 27,516 140 Residential real estate 15,787 69 9,173 76 Home equity 5,735 28 5,222 27 Installment 185 1 305 1 Total 77,296 408 51,955 318 Loans with an allowance recorded Commercial & industrial 5,851 43 309 6 Lease financing 0 0 0 0 Construction real estate 0 0 0 0 Commercial real estate 1,707 4 358 3 Residential real estate 670 6 1,042 7 Home equity 0 0 101 1 Installment 0 0 0 0 Total 8,228 53 1,810 17 Total Commercial & industrial 40,404 255 10,023 79 Lease financing 298 0 0 0 Construction real estate 7 0 25 1 Commercial real estate 22,438 102 27,874 143 Residential real estate 16,457 75 10,215 83 Home equity 5,735 28 5,323 28 Installment 185 1 305 1 Total $ 85,524 $ 461 $ 53,765 $ 335 Six months ended June 30, 2019 June 30, 2018 (Dollars in thousands) Average Interest Average Interest Loans with no related allowance recorded Commercial & industrial $ 35,267 $ 491 $ 8,863 $ 99 Lease financing 206 0 27 0 Construction real estate 8 0 26 2 Commercial real estate 21,658 201 24,485 239 Residential real estate 16,290 155 8,407 123 Home equity 5,940 66 4,933 47 Installment 181 2 288 1 Total 79,550 915 47,029 511 Loans with an allowance recorded Commercial & industrial 4,214 86 262 6 Lease financing 0 0 0 0 Construction real estate 0 0 0 0 Commercial real estate 1,641 23 1,278 6 Residential real estate 547 8 1,047 14 Home equity 0 0 100 2 Installment 0 0 0 0 Total 6,402 117 2,687 28 Total Commercial & industrial 39,481 577 9,125 105 Lease financing 206 0 27 0 Construction real estate 8 0 26 2 Commercial real estate 23,299 224 25,763 245 Residential real estate 16,837 163 9,454 137 Home equity 5,940 66 5,033 49 Installment 181 2 288 1 Total $ 85,952 $ 1,032 $ 49,716 $ 539
Changes in Other Real Estate Owned	Changes in OREO were as follows: Three months ended Six months ended June 30, June 30, (Dollars in thousands) 2019 2018 2019 2018 Balance at beginning of period $ 1,665 $ 1,065 $ 1,401 $ 2,781 Additions Commercial & industrial 136 1,020 136 1,190 Residential real estate 768 525 1,272 984 Total additions 904 1,545 1,408 2,174 Disposals Commercial & industrial (248 ) (326 ) (270 ) (2,430 ) Residential real estate (223 ) (292 ) (384 ) (410 ) Total disposals (471 ) (618 ) (654 ) (2,840 ) Valuation adjustment Commercial & industrial (55 ) 0 (55 ) (97 ) Residential real estate (622 ) (139 ) (679 ) (165 ) Total valuation adjustment (677 ) (139 ) (734 ) (262 ) Balance at end of period $ 1,421 $ 1,853 $ 1,421 $ 1,853

ALLOWANCE FOR LOAN AND LEASE _2

ALLOWANCE FOR LOAN AND LEASE LOSSES (Tables)	6 Months Ended
	Jun. 30, 2019
Receivables [Abstract]
Allowance for Loan and Lease Losses by Classification	Changes in the ALLL by loan category were as follows: Three months ended June 30, 2019 Real Estate (Dollars in thousands) Commercial & industrial Lease financing Construction Commercial Residential Home Equity Installment Credit card Total Allowance for loan and lease losses: Balance at beginning of period $ 19,926 $ 1,373 $ 2,793 $ 20,400 $ 5,043 $ 5,250 $ 380 $ 1,557 $ 56,722 Provision for loan and lease losses 6,242 20 121 (211 ) 14 174 32 266 6,658 Gross charge-offs (1,873 ) 0 0 (86 ) (150 ) (689 ) (78 ) (289 ) (3,165 ) Recoveries 291 0 5 254 101 572 61 50 1,334 Total net charge-offs (1,582 ) 0 5 168 (49 ) (117 ) (17 ) (239 ) (1,831 ) Ending allowance for loan and lease losses $ 24,586 $ 1,393 $ 2,919 $ 20,357 $ 5,008 $ 5,307 $ 395 $ 1,584 $ 61,549 Three months ended June 30, 2018 Real Estate (Dollars in thousands) Commercial & industrial Lease financing Construction Commercial Residential Home Equity Installment Credit card Total Allowance for loan and lease losses: Balance at beginning of period $ 18,038 $ 626 $ 4,267 $ 20,321 $ 4,727 $ 4,828 $ 290 $ 1,283 $ 54,380 Provision for loan and lease losses 3,328 170 (282 ) (619 ) (28 ) 171 136 859 3,735 Loans charged off (4,356 ) 0 0 (78 ) (101 ) (385 ) (218 ) (684 ) (5,822 ) Recoveries 518 1 0 887 70 187 82 38 1,783 Total net charge-offs (3,838 ) 1 0 809 (31 ) (198 ) (136 ) (646 ) (4,039 ) Ending allowance for loan and lease losses $ 17,528 $ 797 $ 3,985 $ 20,511 $ 4,668 $ 4,801 $ 290 $ 1,496 $ 54,076 Six months ended June 30, 2019 Real Estate (Dollars in thousands) Commercial & industrial Lease financing Construction Commercial Residential Home equity Installment Credit card Total Allowance for loan and lease losses: Balance at beginning of period $ 18,746 $ 1,130 $ 3,413 $ 21,048 $ 4,964 $ 5,348 $ 362 $ 1,531 $ 56,542 Provision for loan and lease losses 19,510 363 (562 ) 282 139 359 51 599 20,741 Loans charged off (14,201 ) (100 ) 0 (1,300 ) (232 ) (1,157 ) (127 ) (630 ) (17,747 ) Recoveries 531 0 68 327 137 757 109 84 2,013 Total net charge-offs (13,670 ) (100 ) 68 (973 ) (95 ) (400 ) (18 ) (546 ) (15,734 ) Ending allowance for loan and lease losses $ 24,586 $ 1,393 $ 2,919 $ 20,357 $ 5,008 $ 5,307 $ 395 $ 1,584 $ 61,549 Six months ended June 30, 2018 Real Estate (Dollars in thousands) Commercial & industrial Lease financing Construction Commercial Residential Home equity Installment Credit card Total Allowance for loan and lease losses: Balance at beginning of period $ 17,598 $ 675 $ 3,577 $ 20,930 $ 4,683 $ 4,935 $ 307 $ 1,316 $ 54,021 Provision for loan and lease losses 4,217 121 408 196 86 (123 ) 87 1,046 6,038 Loans charged off (5,241 ) 0 0 (2,254 ) (197 ) (627 ) (234 ) (938 ) (9,491 ) Recoveries 954 1 0 1,639 96 616 130 72 3,508 Total net charge-offs (4,287 ) 1 0 (615 ) (101 ) (11 ) (104 ) (866 ) (5,983 ) Ending allowance for loan and lease losses $ 17,528 $ 797 $ 3,985 $ 20,511 $ 4,668 $ 4,801 $ 290 $ 1,496 $ 54,076 As of June 30, 2019 Real Estate (Dollars in thousands) Commercial & industrial Lease financing Construction Commercial Residential Home equity Installment Credit card Total Ending allowance balance attributable to loans Individually evaluated for impairment $ 4,908 $ 0 $ 0 $ 30 $ 85 $ 0 $ 0 $ 0 $ 5,023 Collectively evaluated for impairment 19,678 1,393 2,919 20,327 4,923 5,307 395 1,584 56,526 Ending allowance for loan and lease losses $ 24,586 $ 1,393 $ 2,919 $ 20,357 $ 5,008 $ 5,307 $ 395 $ 1,584 $ 61,549 Loans Individually evaluated for impairment $ 47,384 $ 295 $ 6 $ 19,669 $ 15,978 $ 5,244 $ 195 $ 0 $ 88,771 Collectively evaluated for impairment 2,500,613 90,343 497,677 3,883,985 999,842 781,895 88,954 48,706 8,892,015 Total loans $ 2,547,997 $ 90,638 $ 497,683 $ 3,903,654 $ 1,015,820 $ 787,139 $ 89,149 $ 48,706 $ 8,980,786 As of December 31, 2018 Real Estate (Dollars in thousands) Commercial & industrial Lease financing Construction Commercial Residential Home equity Installment Credit card Total Ending allowance balance attributable to loans Individually evaluated for impairment $ 667 $ 0 $ 0 $ 461 $ 32 $ 0 $ 0 $ 0 $ 1,160 Collectively evaluated for impairment 18,079 1,130 3,413 20,587 4,932 5,348 362 1,531 55,382 Ending allowance for loan and lease losses $ 18,746 $ 1,130 $ 3,413 $ 21,048 $ 4,964 $ 5,348 $ 362 $ 1,531 $ 56,542 Loans Individually evaluated for impairment $ 37,633 $ 22 $ 9 $ 25,022 $ 17,598 $ 6,351 $ 174 $ 0 $ 86,809 Collectively evaluated for impairment 2,477,028 93,393 548,926 3,729,659 938,048 810,931 93,038 46,382 8,737,405 Total loans $ 2,514,661 $ 93,415 $ 548,935 $ 3,754,681 $ 955,646 $ 817,282 $ 93,212 $ 46,382 $ 8,824,214

GOODWILL (Tables)

GOODWILL (Tables)	6 Months Ended
	Jun. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Changes in Carrying Amount of Goodwill	(Dollars in thousands) June 30, December 31, Balance at beginning of year $ 880,251 $ 204,084 Goodwill resulting from business combinations (524 ) 676,167 Balance at end of period $ 879,727 $ 880,251

LEASES (Tables)

LEASES (Tables)	6 Months Ended
	Jun. 30, 2019
Leases [Abstract]
Lease, Cost [Table Text Block]	The components of lease expense were as follows: Three months ended Six months ended (dollars in thousands) June 30, 2019 June 30, 2019 Operating lease cost $ 1,822 $ 3,648 Short-term lease cost 0 1 Variable lease cost 633 1,230 Total operating lease cost $ 2,455 $ 4,879
Lessee, Operating Lease, Liability, Maturity [Table Text Block]	Future minimum commitments due under these lease agreements as of June 30, 2019 are as follows: (dollars in thousands) Operating leases 2019 (remaining six months) $ 3,770 2020 7,469 2021 7,093 2022 6,741 2023 6,695 Thereafter 55,530 Total lease payments 87,298 Less imputed interest 21,794 Total $ 65,504
Schedule of supplemental balance sheet information related to leases. [Table Text Block]	The lease term and discount rate at June 30, 2019 were as follows: Operating leases Weighted-average remaining lease term 16.5 years Weighted-average discount rate 3.4 %
Schedule of supplemental cash flow information related to leases [Table Text Block]	Supplemental cash information at June 30, 2019 related to leases was as follows: Six months ended (dollars in thousands) June 30, 2019 Cash paid for amounts included in the measurement of lease liabilities Operating cash flows from operating leases $ 3,759 ROU assets obtained in exchange for lease obligations Operating leases 64,938

BORROWINGS (Tables)

BORROWINGS (Tables)	6 Months Ended
	Jun. 30, 2019
Debt Disclosure [Abstract]
Schedule Of Remaining Contractual Maturity Of Secured Borrowings And Class Of Collateral Pledged Under Repurchase Agreements Table [Table Text Block]	The following shows the remaining contractual maturity of repurchase agreements by collateral pledged: (Dollars in thousands) Overnight and continuous Repurchase agreements Mortgage-backed securities $ 25,966 Collateralized mortgage obligations 59,655 Total $ 85,621
Summary of Long-term Debt	The following is a summary of First Financial's long-term debt: June 30, 2019 December 31, 2018 (Dollars in thousands) Amount Average rate Amount Average rate Subordinated notes $ 170,758 5.13 % $ 170,550 5.28 % Unamortized debt issuance costs (1,096 ) N/A (1,185 ) N/A FHLB borrowings 376,605 2.13 % 400,599 2.08 % Capital loan with municipality 775 0.00 % 775 0.00 % Total long-term debt $ 547,042 3.07 % $ 570,739 3.04 %

ACCUMULATED OTHER COMPREHENSI_2

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables)	6 Months Ended
	Jun. 30, 2019
Equity [Abstract]
Related Tax Effects Allocated to Other Comprehensive Income and Accumulated Other Comprehensive Income (Loss)	The related tax effects allocated to other comprehensive income and reclassifications out of accumulated other comprehensive income (loss) are as follows: Three months ended June 30, 2019 Total other comprehensive income (loss) Total accumulated other comprehensive income (loss) (Dollars in thousands) Prior to reclass Reclass from Pre-tax Tax effect Net of tax Beginning balance Net activity Ending balance Unrealized gain (loss) on debt securities $ 31,144 $ (37 ) $ 31,181 $ (6,671 ) $ 24,510 $ 12,810 $ 24,510 $ 37,320 Unrealized gain (loss) on derivatives 94 0 94 (22 ) 72 (145 ) 72 (73 ) Retirement obligation 0 (320 ) 320 (74 ) 246 (32,300 ) 246 (32,054 ) Total $ 31,238 $ (357 ) $ 31,595 $ (6,767 ) $ 24,828 $ (19,635 ) $ 24,828 $ 5,193 Three months ended June 30, 2018 Total other comprehensive income (loss) Total accumulated other comprehensive income (loss) (Dollars in thousands) Prior to reclass Reclass from Pre-tax Tax effect Net of tax Beginning balance Net activity Ending balance Unrealized gain (loss) on debt securities $ (11,456 ) $ (30 ) $ (11,426 ) $ 2,448 $ (8,978 ) $ (10,202 ) $ (8,978 ) $ (19,180 ) Unrealized gain (loss) on derivatives 203 0 203 (44 ) 159 (545 ) 159 (386 ) Retirement obligation 0 (452 ) 452 42 494 (24,087 ) 494 (23,593 ) Total $ (11,253 ) $ (482 ) $ (10,771 ) $ 2,446 $ (8,325 ) $ (34,834 ) $ (8,325 ) $ (43,159 ) Six months ended June 30, 2019 Total other comprehensive income Total accumulated other comprehensive income (loss) (Dollars in thousands) Prior to Reclass Pre-tax Tax effect Net of tax Beginning balance Net activity Cumulative effect of new standard Ending balance Unrealized gain (loss) on debt securities $ 60,869 $ (215 ) $ 61,084 $ (13,069 ) $ 48,015 $ (11,601 ) $ 48,015 $ 906 $ 37,320 Unrealized gain (loss) on derivatives 187 0 187 (43 ) 144 (217 ) 144 0 (73 ) Retirement obligation 0 (695 ) 695 (159 ) 536 (32,590 ) 536 0 (32,054 ) Total $ 61,056 $ (910 ) $ 61,966 $ (13,271 ) $ 48,695 $ (44,408 ) $ 48,695 $ 906 $ 5,193 Six months ended June 30, 2018 Total other comprehensive income Total accumulated other comprehensive income (loss) (Dollars in thousands) Prior to Reclass Pre-tax Tax effect Net of tax Beginning balance Net activity Cumulative effect of new standard Ending balance Unrealized gain (loss) on debt securities $ (23,992 ) $ (30 ) $ (23,962 ) $ 5,154 $ (18,808 ) $ (182 ) $ (18,808 ) $ (190 ) $ (19,180 ) Unrealized gain (loss) on derivatives 405 0 405 (90 ) 315 (577 ) 315 (124 ) (386 ) Retirement obligation 0 (871 ) 871 (54 ) 817 (19,631 ) 817 (4,779 ) (23,593 ) Total $ (23,587 ) $ (901 ) $ (22,686 ) $ 5,010 $ (17,676 ) $ (20,390 ) $ (17,676 ) $ (5,093 ) $ (43,159 )
Other Accumulated Comprehensive income reclassified from AOCI	The following table presents the activity reclassified from accumulated other comprehensive income into income during the three and six month periods ended June 30, 2019 and 2018 , respectively: Amount reclassified from accumulated other comprehensive income (1) Three months ended Six months ended June 30, June 30, (Dollars in thousands) 2019 2018 2019 2018 Affected Line Item in the Consolidated Statements of Income Realized gain (loss) on securities available-for-sale $ (37 ) $ (30 ) $ (215 ) $ (30 ) Net gain (loss) on sales of investments securities Defined benefit pension plan Amortization of prior service cost (2) 106 103 206 206 Other noninterest expense Recognized net actuarial loss (2) (426 ) (555 ) (901 ) (1,077 ) Other noninterest expense Defined benefit pension plan total (320 ) (452 ) (695 ) (871 ) Total reclassifications for the period, before tax $ (357 ) $ (482 ) $ (910 ) $ (901 ) (1) Negative amounts are reductions to net income. (2) Included in the computation of net periodic pension cost (see Note 13 - Employee Benefit Plans for additional details).

DERIVATIVES (Tables)

DERIVATIVES (Tables)	6 Months Ended
	Jun. 30, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Summary of Derivative Financial Instruments and Balances	The following table details the classification and amounts recognized in the Consolidated Balance Sheets for client derivatives: June 30, 2019 December 31, 2018 Estimated fair value Estimated fair value (Dollars in thousands) Balance sheet classification Notional amount Gain Loss Notional amount Gain Loss Client derivatives - instruments associated with loans Matched interest rate swaps with borrower Accrued interest and other assets $ 1,585,450 $ 66,637 $ (2,275 ) $ 1,359,990 $ 17,402 $ (11,787 ) Matched interest rate swaps with counterparty Accrued interest and other liabilities 1,585,450 2,275 (66,657 ) 1,359,990 11,787 (17,401 ) Total $ 3,170,900 $ 68,912 $ (68,932 ) $ 2,719,980 $ 29,189 $ (29,188 )
Disclosure by Type of Financial Instrument	The following table discloses the gross and net amounts of client derivative liabilities recognized in the Consolidated Balance Sheets: June 30, 2019 December 31, 2018 (Dollars in thousands) Gross amounts of recognized liabilities Gross amounts offset in the Consolidated Balance Sheets Net amounts of liabilities (assets) presented in the Consolidated Balance Sheets Gross amounts of recognized liabilities Gross amounts offset in the Consolidated Balance Sheets Net amounts of liabilities (assets) presented in the Consolidated Balance Sheets Client derivatives Matched interest rate swaps with counterparty $ 68,932 $ (71,750 ) $ (2,818 ) $ 29,189 $ (14,577 ) $ 14,612
Derivative Financial Instruments, Average Remaining Maturity and the Weighted-Average Interest Rates being Paid and Received	The following table details the derivative financial instruments, the average remaining maturities and the weighted-average interest rates being paid and received by First Financial at June 30, 2019 : Weighted-average rate (Dollars in thousands) Notional amount Average maturity (years) Fair value Receive Pay Client derivatives Receive fixed, matched interest rate swaps with borrower $ 1,585,450 6.2 $ 64,362 4.69 % 4.66 % Pay fixed, matched interest rate swaps with counterparty 1,585,450 6.2 (64,382 ) 4.66 % 4.69 % Total client derivatives $ 3,170,900 6.2 $ (20 ) 4.68 % 4.68 %

EMPLOYEE BENEFIT PLANS (Tables)

EMPLOYEE BENEFIT PLANS (Tables)	6 Months Ended
	Jun. 30, 2019
Retirement Benefits [Abstract]
Employee Benefit Plan Amounts Recognized in the Consolidated Balance Sheets and Consolidated Statements of Income	As a result of the plan’s actuarial projections, which included consideration of the impact of the merger with MSFG, First Financial recorded expense as set forth in the following table. The amounts are recognized in First Financial’s Consolidated Statements of Income related to the Company's pension plan. Three months ended Six months ended June 30, June 30, (Dollars in thousands) 2019 2018 2019 2018 Service cost $ 1,545 $ 1,735 $ 3,295 $ 3,030 Interest cost 689 601 1,389 1,191 Expected return on assets (2,409 ) (2,450 ) (4,859 ) (4,910 ) Amortization of prior service cost (106 ) (103 ) (206 ) (206 ) Net actuarial loss 426 555 901 1,077 Net periodic benefit cost (income) $ 145 $ 338 $ 520 $ 182

EARNINGS PER COMMON SHARE (Tabl

EARNINGS PER COMMON SHARE (Tables)	6 Months Ended
	Jun. 30, 2019
Earnings Per Share [Abstract]
Computation of Basic and Diluted Earnings Per Share	The following table sets forth the computation of basic and diluted earnings per share: Three months ended Six months ended June 30, June 30, (Dollars in thousands, except per share data) 2019 2018 2019 2018 Numerator Net income available to common shareholders $ 52,703 $ 36,418 $ 98,542 $ 66,924 Denominator Basic earnings per common share - weighted average shares 98,083,799 97,347,533 98,005,379 79,599,709 Effect of dilutive securities Employee stock awards 564,585 545,374 537,568 504,914 Warrants 0 539,165 0 524,872 Diluted earnings per common share - adjusted weighted average shares 98,648,384 98,432,072 98,542,947 80,629,495 Earnings per share available to common shareholders Basic $ 0.54 $ 0.37 $ 1.01 $ 0.84 Diluted $ 0.53 $ 0.37 $ 1.00 $ 0.83

FAIR VALUE DISCLOSURES (Tables)

FAIR VALUE DISCLOSURES (Tables)	6 Months Ended
	Jun. 30, 2019
Fair Value Disclosures [Abstract]
Estimated Fair Values of Financial Instruments	The estimated fair values of First Financial’s financial instruments not measured at fair value on a recurring or nonrecurring basis in the consolidated financial statements were as follows: Carrying Estimated fair value (Dollars in thousands) value Total Level 1 Level 2 Level 3 June 30, 2019 Financial assets Cash and short-term investments $ 271,362 $ 271,362 $ 271,362 $ 0 $ 0 Investment securities held-to-maturity 154,327 153,039 0 153,039 0 Other investments 127,439 N/A N/A N/A N/A Loans held for sale 20,244 20,244 0 20,244 0 Loans and leases 8,919,237 8,850,385 0 0 8,850,385 Accrued interest receivable 44,474 44,474 0 14,287 30,187 Financial liabilities Deposits 10,109,004 10,102,924 0 10,102,924 0 Short-term borrowings 1,313,321 1,313,321 1,313,321 0 0 Long-term debt 547,042 545,983 0 545,983 0 Accrued interest payable 12,730 12,730 2,859 9,871 0 Carrying Estimated fair value (Dollars in thousands) value Total Level 1 Level 2 Level 3 December 31, 2018 Financial assets Cash and short-term investments $ 273,959 $ 273,959 $ 273,959 $ 0 $ 0 Investment securities held-to-maturity 429,328 424,118 0 424,118 0 Other investments 115,660 N/A N/A N/A N/A Loans held for sale 4,372 4,372 0 4,372 0 Loans and leases 8,767,672 8,662,868 0 0 8,662,868 Accrued interest receivable 41,816 41,816 0 13,819 27,997 Financial liabilities Deposits 10,140,394 10,113,475 0 10,113,475 0 Short-term borrowings 1,040,691 1,040,691 1,040,691 0 0 Long-term debt 570,739 557,933 0 557,933 0 Accrued interest payable 12,126 12,126 2,035 10,091 0
Summary of Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis	The financial assets and liabilities measured at fair value on a recurring basis in the consolidated financial statements were as follows: Fair value measurements using (Dollars in thousands) Level 1 Level 2 Level 3 Assets/liabilities at fair value June 30, 2019 Assets Derivatives $ 0 $ 69,038 $ 0 $ 69,038 Investment securities available-for-sale 100 3,140,072 12,798 3,152,970 Total $ 100 $ 3,209,110 $ 12,798 $ 3,222,008 Liabilities Derivatives $ 0 $ 69,470 $ 0 $ 69,470 Fair value measurements using (Dollars in thousands) Level 1 Level 2 Level 3 Assets/liabilities at fair value December 31, 2018 Assets Derivatives $ 0 $ 29,543 $ 0 $ 29,543 Investment securities available-for-sale 97 2,764,443 14,715 2,779,255 Total $ 97 $ 2,793,986 $ 14,715 $ 2,808,798 Liabilities Derivatives $ 0 $ 29,336 $ 0 $ 29,336
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation	The following table presents a reconciliation for certain AFS securities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the three months ended June 30, 2019 . No AFS securities were measured at fair value on a recurring basis for the three or six months ended June 30, 2018. Three months ended Six months ended (dollars in thousands) June 30, 2019 June 30, 2019 Beginning balance $ 13,355 $ 14,715 Accretion (amortization) (569 ) (562 ) Increase (decrease) in fair value 12 33 Settlements 0 (1,388 ) Ending balance $ 12,798 $ 12,798
Summary of Financial Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis	The following table summarizes financial assets and liabilities measured at fair value on a nonrecurring basis. Fair value measurements using (Dollars in thousands) Level 1 Level 2 Level 3 June 30, 2019 Assets Impaired loans $ 0 $ 0 $ 4,398 OREO 0 0 953 Fair value measurements using (Dollars in thousands) Level 1 Level 2 Level 3 December 31, 2018 Assets Impaired loans $ 0 $ 0 $ 1,320 OREO 0 0 1,089

BUSINESS COMBINATIONS (Tables)

BUSINESS COMBINATIONS (Tables)	6 Months Ended
	Jun. 30, 2019
Business Combinations [Abstract]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	The following table provides the purchase price calculation as of the acquisition date, identifiable assets purchased and liabilities assumed at their estimated fair value. As a condition of the merger, certain acquired assets and liabilities held for sale were divested subsequent to the closing of the merger. There was no gain or loss recorded in the Consolidated Statement of Income in conjunction with this divestiture. (Dollars in thousands) MainSource Purchase consideration Cash consideration $ 43 Stock consideration 1,043,424 Warrant consideration 14,460 Options consideration 1,577 Total purchase consideration 1,059,504 Assets acquired Cash 71,806 Investment securities available-for-sale 900,935 Investment securities held-to-maturity 171,423 Other investments 28,763 Loans 2,792,572 Premises and equipment 98,814 Intangible assets 42,887 Other assets 167,829 Assets held for sale 127,775 Total assets acquired 4,402,804 Liabilities assumed Deposits 3,263,920 Subordinated notes 49,027 FHLB advances 291,887 Other borrowings 205,620 Other liabilities 32,649 Liabilities held for sale 175,840 Total liabilities assumed 4,018,943 Net identifiable assets 383,861 Goodwill $ 675,643
Business Acquisition, Pro Forma Information, Nonrecurring Adjustments	Twelve months ended December 31, (Dollars in thousands, except per share data) 2018 2017 Pro Forma Condensed Combined Income Statement Information Net interest income $ 484,915 $ 454,579 Net income 221,122 130,402 Basic earnings per share 2.27 1.34 Diluted earnings per share 2.25 1.33

RECENTLY ADOPTED AND ISSUED A_2

RECENTLY ADOPTED AND ISSUED ACCOUNTING STANDARDS RECENTLY ADOPTED AND ISSUED ACCOUNTING STANDARDS - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Jun. 30, 2018	Jun. 30, 2019	Jan. 01, 2019
Income Tax Disclosure [Abstract]
Operating Lease, Right-of-Use Asset			$ 59,900	$ 60,200
Operating Lease, Liability			$ 65,504	$ 65,800
Debt Securities, Held-to-maturity, Transfer, Amount	$ 268,700	$ 367,900
Realized gain (loss) on debt securities transferred from HTM to AFS	$ 200

INVESTMENTS - Additional Inform

INVESTMENTS - Additional Information (Details) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2019USD ($)	Mar. 31, 2019USD ($)	Jun. 30, 2018USD ($)	Jun. 30, 2019USD ($)	Jun. 30, 2018USD ($)	Dec. 31, 2018
Gain (Loss) on Securities [Line Items]
Realized gain (loss) on debt securities transferred from HTM to AFS		$ 200
NumberOfSecuritiesInSecurityPortfolio	1,347			1,347		1,417
NumberOfSecuritiesInUnrealizedLossPosition	177			177		504
Proceeds from Sale of Debt Securities, Available-for-sale	$ 115,640		$ 216,197	$ 115,600	$ 216,200
Available-for-sale Securities, Gross Realized Gains	684		0	700
Available-for-sale Securities, Gross Realized Losses	$ 720		30	$ 700
Debt Securities, Held-to-maturity, Transfer, Amount		$ 268,700	$ 367,900

INVESTMENTS - Summary of Held-T

INVESTMENTS - Summary of Held-To-Maturity and Available-For-Sale Investment Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Investment Holdings [Line Items]
Total	$ 154,327	$ 429,328
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	1,007	2,212
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(2,295)	(7,422)
Held-to-Maturity Market Value	153,039	424,118
Total	3,104,152	2,792,326
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments	54,060	9,409
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments	(5,242)	(22,480)
Investment securities available-for-sale	3,152,970	2,779,255
U.S. Treasuries
Investment Holdings [Line Items]
Total	0	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	0
Held-to-Maturity Market Value	0	0
Total	99	99
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments	1	0
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments	0	(2)
Investment securities available-for-sale	100	97
Securities of U.S. government agencies and corporations
Investment Holdings [Line Items]
Total	0	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	0
Held-to-Maturity Market Value	0	0
Total	24,709	32,095
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments	239	57
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments	(139)	(233)
Investment securities available-for-sale	24,809	31,919
Residential Mortgage Backed Securities [Member]
Investment Holdings [Line Items]
Total	23,736	25,565
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	163	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(194)	(1,045)
Held-to-Maturity Market Value	23,705	24,520
Total	507,434	565,071
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments	7,716	691
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments	(1,161)	(7,163)
Investment securities available-for-sale	513,989	558,599
Commercial Mortgage Backed Securities [Member]
Investment Holdings [Line Items]
Total	107,810	147,780
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	248	258
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(1,809)	(4,385)
Held-to-Maturity Market Value	106,249	143,653
Total	482,157	423,797
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments	5,815	819
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments	(1,327)	(3,581)
Investment securities available-for-sale	486,645	421,035
Collateralized Mortgage Backed Securities [Member]
Investment Holdings [Line Items]
Total	11,264	12,540
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(181)	(633)
Held-to-Maturity Market Value	11,083	11,907
Total	940,304	928,586
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments	18,613	4,319
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments	(531)	(6,158)
Investment securities available-for-sale	958,386	926,747
Obligations of state and other political subdivisions
Investment Holdings [Line Items]
Total	11,517	243,443
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	596	1,954
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(111)	(1,359)
Held-to-Maturity Market Value	12,002	244,038
Total	549,546	257,300
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments	18,991	2,554
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments	(110)	(1,429)
Investment securities available-for-sale	568,427	258,425
Asset-backed Securities [Member]
Investment Holdings [Line Items]
Total	0	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	0
Held-to-Maturity Market Value	0	0
Total	521,357	511,430
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments	1,349	611
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments	(1,605)	(2,810)
Investment securities available-for-sale	521,101	509,231
Other securities
Investment Holdings [Line Items]
Total	0	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	0
Held-to-Maturity Market Value	0	0
Total	78,546	73,948
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments	1,336	358
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments	(369)	(1,104)
Investment securities available-for-sale	$ 79,513	$ 73,202

INVESTMENTS - Summary of Invest

INVESTMENTS - Summary of Investment Securities by Estimated Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Held-to-Maturity Amortized Cost
Amortized Cost	$ 154,327	$ 429,328
Held-to-Maturity Market Value
Debt Securities, Held-to-maturity, Fair Value	153,039	424,118
Available-for-Sale Amortized Cost
Available-for-sale Securities, Amortized Cost Basis	3,104,152	2,792,326
Available-for-Sale Market Value
Investment securities available-for-sale	3,152,970	2,779,255
One Year or Less [Member]
Held-to-Maturity Amortized Cost
Amortized Cost	0
Held-to-Maturity Market Value
Debt Securities, Held-to-maturity, Fair Value	0
Available-for-Sale Amortized Cost
Available-for-sale Securities, Amortized Cost Basis	8,322
Available-for-Sale Market Value
Investment securities available-for-sale	8,337
After One Year Through Five Years [Member]
Held-to-Maturity Amortized Cost
Amortized Cost	0
Held-to-Maturity Market Value
Debt Securities, Held-to-maturity, Fair Value	0
Available-for-Sale Amortized Cost
Available-for-sale Securities, Amortized Cost Basis	41,902
Available-for-Sale Market Value
Investment securities available-for-sale	42,607
After Five Years Through Ten Years [Member]
Held-to-Maturity Amortized Cost
Amortized Cost	4,284
Held-to-Maturity Market Value
Debt Securities, Held-to-maturity, Fair Value	4,721
Available-for-Sale Amortized Cost
Available-for-sale Securities, Amortized Cost Basis	156,370
Available-for-Sale Market Value
Investment securities available-for-sale	160,519
After Ten Years [Member]
Held-to-Maturity Amortized Cost
Amortized Cost	7,233
Held-to-Maturity Market Value
Debt Securities, Held-to-maturity, Fair Value	7,281
Available-for-Sale Amortized Cost
Available-for-sale Securities, Amortized Cost Basis	446,306
Available-for-Sale Market Value
Investment securities available-for-sale	461,386
Residential Mortgage Backed Securities [Member]
Held-to-Maturity Amortized Cost
Amortized Cost	23,736	25,565
Held-to-Maturity Market Value
Debt Securities, Held-to-maturity, Fair Value	23,705	24,520
Available-for-Sale Amortized Cost
Available-for-sale Securities, Amortized Cost Basis	507,434	565,071
Available-for-Sale Market Value
Investment securities available-for-sale	513,989	558,599
Commercial Mortgage Backed Securities [Member]
Held-to-Maturity Amortized Cost
Amortized Cost	107,810	147,780
Held-to-Maturity Market Value
Debt Securities, Held-to-maturity, Fair Value	106,249	143,653
Available-for-Sale Amortized Cost
Available-for-sale Securities, Amortized Cost Basis	482,157	423,797
Available-for-Sale Market Value
Investment securities available-for-sale	486,645	421,035
Collateralized Mortgage Backed Securities [Member]
Held-to-Maturity Amortized Cost
Amortized Cost	11,264	12,540
Held-to-Maturity Market Value
Debt Securities, Held-to-maturity, Fair Value	11,083	11,907
Available-for-Sale Amortized Cost
Available-for-sale Securities, Amortized Cost Basis	940,304	928,586
Available-for-Sale Market Value
Investment securities available-for-sale	958,386	926,747
Asset-backed Securities [Member]
Held-to-Maturity Amortized Cost
Amortized Cost	0	0
Held-to-Maturity Market Value
Debt Securities, Held-to-maturity, Fair Value	0	0
Available-for-Sale Amortized Cost
Available-for-sale Securities, Amortized Cost Basis	521,357	511,430
Available-for-Sale Market Value
Investment securities available-for-sale	$ 521,101	$ 509,231

INVESTMENTS - Age of Gross Unre

INVESTMENTS - Age of Gross Unrealized Losses and Associated Fair Value by Investment Category (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Investments, Unrealized Loss Position [Line Items]
Less than 12 Months Fair Value	$ 404,445	$ 961,572
Less than 12 Months Unrealized Loss	(1,276)	(6,345)
12 Months or More Fair Value	426,899	882,865
12 Months or More Unrealized Loss	(6,261)	(23,557)
Total Fair Value	831,344	1,844,437
Total Unrealized Loss	(7,537)	(29,902)
U.S. Treasuries
Investments, Unrealized Loss Position [Line Items]
Less than 12 Months Fair Value	0	0
Less than 12 Months Unrealized Loss	0	0
12 Months or More Fair Value	0	97
12 Months or More Unrealized Loss	0	(2)
Total Fair Value	0	97
Total Unrealized Loss	0	(2)
Securities of U.S. government agencies and corporations
Investments, Unrealized Loss Position [Line Items]
Less than 12 Months Fair Value	0	0
Less than 12 Months Unrealized Loss	0	0
12 Months or More Fair Value	8,985	16,777
12 Months or More Unrealized Loss	(139)	(233)
Total Fair Value	8,985	16,777
Total Unrealized Loss	(139)	(233)
Residential Mortgage Backed Securities [Member]
Investments, Unrealized Loss Position [Line Items]
Less than 12 Months Fair Value	10,507	186,029
Less than 12 Months Unrealized Loss	(67)	(935)
12 Months or More Fair Value	131,539	264,795
12 Months or More Unrealized Loss	(1,288)	(7,273)
Total Fair Value	142,046	450,824
Total Unrealized Loss	(1,355)	(8,208)
Commercial Mortgage Backed Securities [Member]
Investments, Unrealized Loss Position [Line Items]
Less than 12 Months Fair Value	99,535	147,754
Less than 12 Months Unrealized Loss	(197)	(369)
12 Months or More Fair Value	91,179	232,363
12 Months or More Unrealized Loss	(2,939)	(7,597)
Total Fair Value	190,714	380,117
Total Unrealized Loss	(3,136)	(7,966)
Collateralized Mortgage Backed Securities [Member]
Investments, Unrealized Loss Position [Line Items]
Less than 12 Months Fair Value	50,381	194,795
Less than 12 Months Unrealized Loss	(103)	(1,546)
12 Months or More Fair Value	94,939	240,514
12 Months or More Unrealized Loss	(609)	(5,245)
Total Fair Value	145,320	435,309
Total Unrealized Loss	(712)	(6,791)
Obligations of state and other political subdivisions
Investments, Unrealized Loss Position [Line Items]
Less than 12 Months Fair Value	19,676	62,805
Less than 12 Months Unrealized Loss	(38)	(299)
12 Months or More Fair Value	14,123	86,644
12 Months or More Unrealized Loss	(183)	(2,489)
Total Fair Value	33,799	149,449
Total Unrealized Loss	(221)	(2,788)
Asset-backed Securities [Member]
Investments, Unrealized Loss Position [Line Items]
Less than 12 Months Fair Value	218,191	336,437
Less than 12 Months Unrealized Loss	(829)	(2,312)
12 Months or More Fair Value	80,710	37,105
12 Months or More Unrealized Loss	(776)	(498)
Total Fair Value	298,901	373,542
Total Unrealized Loss	(1,605)	(2,810)
Other securities
Investments, Unrealized Loss Position [Line Items]
Less than 12 Months Fair Value	6,155	33,752
Less than 12 Months Unrealized Loss	(42)	(884)
12 Months or More Fair Value	5,424	4,570
12 Months or More Unrealized Loss	(327)	(220)
Total Fair Value	11,579	38,322
Total Unrealized Loss	$ (369)	$ (1,104)

LOANS AND LEASES - Additional I

LOANS AND LEASES - Additional Information (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2019USD ($)	Jun. 30, 2018USD ($)loans	Jun. 30, 2019USD ($)loans	Jun. 30, 2018USD ($)loans	Mar. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Mar. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Troubled Debt Restructuring, Subsequent Default	$ 0	$ 41,000	$ 6,800,000
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | loans		1	2	1
Financing Recivable Modifications, Investment Recorded				$ 41,000
Restructured Loans, Portion Determined to be Uncollectible	0	$ 100,000	$ 0	100,000
Purchased impaired loans	81,721,000		81,721,000			$ 96,320,000
Restructured Loans, Nonaccrual Status	11,000,000		11,000,000			22,400,000
Write-downs	677,000	139,000	734,000	262,000
Real Estate Acquired Through Foreclosure	1,421,000	1,853,000	1,421,000	1,853,000	$ 1,665,000	$ 1,401,000	$ 1,065,000	$ 2,781,000
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Restructured Loans, Loan Relationships, Review Threshold Amount Minimum			250,000
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Restructured Loans, Loan Relationships, Review Threshold Amount Minimum			250,000
Write-downs	$ 622,000	$ 139,000	$ 679,000	$ 165,000

LOANS AND LEASES - Commercial a

LOANS AND LEASES - Commercial and Consumer Credit Exposure by Risk Attribute (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Net of Deferred Income	$ 8,980,786	$ 8,824,214
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Net of Deferred Income	6,828,038	6,736,493
Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Net of Deferred Income	84,472	63,850
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Net of Deferred Income	127,462	111,349
Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0	0
Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Net of Deferred Income	2,547,997	2,514,661
Commercial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Net of Deferred Income	2,411,763	2,432,834
Commercial | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Net of Deferred Income	62,333	24,594
Commercial | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Net of Deferred Income	73,901	57,233
Commercial | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0	0
Construction real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Net of Deferred Income	497,683	548,935
Construction real estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Net of Deferred Income	497,082	548,323
Construction real estate | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0	603
Construction real estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Net of Deferred Income	601	9
Construction real estate | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0	0
Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Net of Deferred Income	3,903,654	3,754,681
Commercial real estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Net of Deferred Income	3,832,028	3,664,434
Commercial real estate | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Net of Deferred Income	21,507	38,653
Commercial real estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Net of Deferred Income	50,119	51,594
Commercial real estate | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0	0
Lease financing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Net of Deferred Income	90,638	93,415
Lease financing | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Net of Deferred Income	87,165	90,902
Lease financing | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Net of Deferred Income	632	0
Lease financing | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Net of Deferred Income	2,841	2,513
Lease financing | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0	0
Total commercial loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Net of Deferred Income	7,039,972	6,911,692
Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,015,820	955,646
Residential real estate | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Net of Deferred Income	999,843	939,936
Residential real estate | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Net of Deferred Income	15,977	15,710
Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Net of Deferred Income	787,139	817,282
Home equity | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Net of Deferred Income	781,895	811,108
Home equity | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Net of Deferred Income	5,244	6,174
Installment
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Net of Deferred Income	89,149	93,212
Installment | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Net of Deferred Income	88,954	93,038
Installment | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Net of Deferred Income	195	174
Credit card
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Net of Deferred Income	48,706	46,382
Credit card | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Net of Deferred Income	48,599	46,382
Credit card | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Net of Deferred Income	107	0
Total consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,940,814	1,912,522
Total consumer loans | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,919,291	1,890,464
Total consumer loans | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and Leases Receivable, Net of Deferred Income	$ 21,523	$ 22,058

LOANS AND LEASES - Loan Delinqu

LOANS AND LEASES - Loan Delinquency, including Nonaccrual Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	$ 60,537	$ 70,190
Current	8,838,528	8,657,704
Loans and Leases Receivable, Gross	8,899,065	8,727,894
Purchased impaired loans	81,721	96,320
Total loans and leases	8,980,786	8,824,214
> 90 days past due and still accruing	107	63
Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	24,662	37,266
Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	6,462	5,536
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	29,413	27,388
Commercial
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	29,727	20,833
Current	2,513,194	2,488,450
Loans and Leases Receivable, Gross	2,542,921	2,509,283
Purchased impaired loans	5,076	5,378
Total loans and leases	2,547,997	2,514,661
> 90 days past due and still accruing	0	0
Commercial | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	16,749	13,369
Commercial | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	1,093	41
Commercial | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	11,885	7,423
Lease financing
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	0	352
Current	90,638	93,063
Loans and Leases Receivable, Gross	90,638	93,415
Purchased impaired loans	0	0
Total loans and leases	90,638	93,415
> 90 days past due and still accruing	0	0
Lease financing | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	0	352
Lease financing | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	0	0
Lease financing | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	0	0
Construction real estate
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	595	0
Current	496,903	548,687
Loans and Leases Receivable, Gross	497,498	548,687
Purchased impaired loans	185	248
Total loans and leases	497,683	548,935
> 90 days past due and still accruing	0	0
Construction real estate | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	0	0
Construction real estate | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	595	0
Construction real estate | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	0	0
Commercial real estate
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	13,312	20,081
Current	3,847,576	3,682,455
Loans and Leases Receivable, Gross	3,860,888	3,702,536
Purchased impaired loans	42,766	52,145
Total loans and leases	3,903,654	3,754,681
> 90 days past due and still accruing	0	0
Commercial real estate | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	1,925	6,279
Commercial real estate | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	1,345	1,158
Commercial real estate | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	10,042	12,644
Residential real estate
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	8,419	18,571
Current	976,923	902,404
Loans and Leases Receivable, Gross	985,342	920,975
Purchased impaired loans	30,478	34,671
Total loans and leases	1,015,820	955,646
> 90 days past due and still accruing	0	0
Residential real estate | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	2,313	11,060
Residential real estate | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	1,393	2,976
Residential real estate | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	4,713	4,535
Home equity
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	7,446	9,051
Current	776,821	804,835
Loans and Leases Receivable, Gross	784,267	813,886
Purchased impaired loans	2,872	3,396
Total loans and leases	787,139	817,282
> 90 days past due and still accruing	0	0
Home equity | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	3,160	5,245
Home equity | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	1,683	1,228
Home equity | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	2,603	2,578
Installment
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	435	602
Current	88,370	92,128
Loans and Leases Receivable, Gross	88,805	92,730
Purchased impaired loans	344	482
Total loans and leases	89,149	93,212
> 90 days past due and still accruing	0	0
Installment | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	205	420
Installment | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	167	37
Installment | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	63	145
Credit card
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	603	700
Current	48,103	45,682
Loans and Leases Receivable, Gross	48,706	46,382
Purchased impaired loans	0	0
Total loans and leases	48,706	46,382
> 90 days past due and still accruing	107	63
Credit card | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	310	541
Credit card | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	186	96
Credit card | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	$ 107	$ 63

LOANS AND LEASES - Restructured

LOANS AND LEASES - Restructured Loans (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2019USD ($)loans	Jun. 30, 2018USD ($)loans	Jun. 30, 2019USD ($)loansd	Jun. 30, 2018USD ($)loans	Dec. 31, 2018USD ($)loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Extended Maturities	$ 0	$ 2,000,000	$ 2,877,000	$ 2,888,000
Adjusted Interest Rates	0	0	5,284,000	52,000
Combined Rate And Maturity	0	0	508,000	0
Forebearance Agreements	15,078,000	6,199,000	15,635,000	6,199,000
Other	1,843,000	201,000	1,985,000	339,000
Total	$ 16,921,000	$ 8,400,000	$ 26,289,000	$ 9,478,000
Restructured loans, Number of Loans | loans	25	13	42	21
Restructured loans, Restructured loans, Pre-Modification Loan Balance	$ 17,245,000	$ 8,469,000	$ 26,681,000	$ 9,562,000
Restructured loans, Period End Balance	16,921,000	8,400,000	26,289,000	9,478,000
Financing Receivable, Troubled Debt Restructuring, Subsequent Default	$ 0	41,000	$ 6,800,000
Number of Restructured Loans | loans	177		177		196
Total restructured loans	$ 48,400,000		$ 48,400,000		$ 38,500,000
Document Period End Date			Jun. 30, 2019
Restructured loans on accrual status	37,420,000		$ 37,420,000		16,109,000
Restructured Loans, Nonaccrual Status	11,000,000		11,000,000		22,400,000
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend	300,000		300,000		0
Allowance for loan and lease losses lncluded in reserves for restructured loans	5,600,000		5,600,000		1,500,000
Restructured Loans, Portion Determined to be Uncollectible	0	$ 100,000	0	$ 100,000
Accruing TDRs performing in accordance with restructured terms for more than one year	$ 12,000,000		$ 12,000,000		$ 7,900,000
Restructured loans performance threshold (days) | d			90
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | loans		1	2	1
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Restructured loans, Number of Loans | loans	1	8	6	12
Restructured loans, Restructured loans, Pre-Modification Loan Balance	$ 14,889,000	$ 6,221,000	$ 22,527,000	$ 7,149,000
Restructured loans, Period End Balance	$ 14,889,000	$ 6,183,000	$ 22,550,000	$ 7,096,000
Construction real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Restructured loans, Number of Loans | loans	0	0	0	0
Restructured loans, Restructured loans, Pre-Modification Loan Balance	$ 0	$ 0	$ 0	$ 0
Restructured loans, Period End Balance	$ 0	$ 0	$ 0	$ 0
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Restructured loans, Number of Loans | loans	1	4	7	6
Restructured loans, Restructured loans, Pre-Modification Loan Balance	$ 42,000	$ 2,047,000	$ 1,365,000	$ 2,119,000
Restructured loans, Period End Balance	$ 42,000	$ 2,016,000	$ 1,274,000	$ 2,088,000
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Restructured loans, Number of Loans | loans	12	1	17	3
Restructured loans, Restructured loans, Pre-Modification Loan Balance	$ 2,008,000	$ 201,000	$ 2,466,000	$ 294,000
Restructured loans, Period End Balance	$ 1,713,000	$ 201,000	2,171,000	$ 294,000
Restructured Loans, Loan Relationships, Review Threshold Amount Minimum			$ 250,000
Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Restructured loans, Number of Loans | loans	11	0	12	0
Restructured loans, Restructured loans, Pre-Modification Loan Balance	$ 306,000	$ 0	$ 323,000	$ 0
Restructured loans, Period End Balance	$ 277,000	$ 0	$ 294,000	$ 0
Installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Restructured loans, Number of Loans | loans	0	0	0	0
Restructured loans, Restructured loans, Pre-Modification Loan Balance	$ 0	$ 0	$ 0	$ 0
Restructured loans, Period End Balance	$ 0	$ 0	$ 0	$ 0

LOANS AND LEASES - Nonaccrual,

LOANS AND LEASES - Nonaccrual, Restructured and Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Financing Receivable, Troubled Debt Restructuring [Line Items]
Document Period End Date			Jun. 30, 2019
Average current balance	$ 85,524	$ 53,765	$ 85,952	$ 49,716
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	53	17	117	28
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	408	318	915	511
Nonaccrual loans	51,351		51,351		$ 70,700
Accruing trouble debt restructurings	37,420		37,420		16,109
Total impaired loans	88,771		88,771		86,809
Restructured loans - nonaccrual status	11,000		11,000		22,400
Interest income effect
Gross amount of interest that would have been recorded under original terms	1,467	1,132	3,080	1,934
Interest included in income
Nonaccrual loans	192	146	527	226
Troubled debt restructurings	269	189	505	313
Total interest included in income	461	335	1,032	539
Net impact on interest income	1,006	797	2,048	1,395
Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Average current balance	40,404	10,023	39,481	9,125
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	43	6	86	6
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	212	73	491	99
Nonaccrual loans	18,502		18,502		30,925
Total impaired loans	47,384		47,384		37,633
Interest included in income
Total interest included in income	255	79	577	105
Lease financing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Average current balance	298	0	206	27
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0	0	0	0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0	0	0	0
Nonaccrual loans	295		295		22
Total impaired loans	295		295		22
Interest included in income
Total interest included in income	0	0	0	0
Construction real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Average current balance	7	25	8	26
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0	0	0	0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0	1	0	2
Nonaccrual loans	6		6		9
Total impaired loans	6		6		9
Interest included in income
Total interest included in income	0	1	0	2
Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Average current balance	22,438	27,874	23,299	25,763
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	4	3	23	6
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	98	140	201	239
Nonaccrual loans	15,981		15,981		20,500
Total impaired loans	19,669		19,669		25,022
Interest included in income
Total interest included in income	102	143	224	245
Residential real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Average current balance	16,457	10,215	16,837	9,454
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	6	7	8	14
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	69	76	155	123
Nonaccrual loans	11,627		11,627		13,495
Total impaired loans	15,978		15,978		17,598
Interest included in income
Total interest included in income	75	83	163	137
Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Average current balance	5,735	5,323	5,940	5,033
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0	1	0	2
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	28	27	66	47
Nonaccrual loans	4,745		4,745		5,580
Total impaired loans	5,244		5,244		6,351
Interest included in income
Total interest included in income	28	28	66	49
Installment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Average current balance	185	305	181	288
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0	0	0	0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	1	1	2	1
Nonaccrual loans	195		195		169
Total impaired loans	195		195		174
Interest included in income
Total interest included in income	1	1	2	1
Loans with no related allowance recorded [member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Average current balance	77,296	51,955	79,550	47,029
Total impaired loans	78,394		78,394		84,060
Loans with no related allowance recorded [member] | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Average current balance	34,553	9,714	35,267	8,863
Total impaired loans	38,964		38,964		36,694
Loans with no related allowance recorded [member] | Lease financing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Average current balance	298	0	206	27
Total impaired loans	295		295		22
Loans with no related allowance recorded [member] | Construction real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Average current balance	7	25	8	26
Total impaired loans	6		6		9
Loans with no related allowance recorded [member] | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Average current balance	20,731	27,516	21,658	24,485
Total impaired loans	18,753		18,753		23,513
Loans with no related allowance recorded [member] | Residential real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Average current balance	15,787	9,173	16,290	8,407
Total impaired loans	14,937		14,937		17,297
Loans with no related allowance recorded [member] | Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Average current balance	5,735	5,222	5,940	4,933
Total impaired loans	5,244		5,244		6,351
Loans with no related allowance recorded [member] | Installment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Average current balance	185	305	181	288
Total impaired loans	195		195		174
Impaired Financing Receivables With Related Allowance [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total impaired loans	10,377		10,377
Impaired Financing Receivables With Related Allowance [Member] | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Average current balance	5,851	309	4,214	262
Total impaired loans	8,420		8,420		939
Impaired Financing Receivables With Related Allowance [Member] | Lease financing
Financing Receivable, Troubled Debt Restructuring [Line Items]
Average current balance	0	0	0	0
Total impaired loans	0		0		0
Impaired Financing Receivables With Related Allowance [Member] | Construction real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Average current balance	0	0	0	0
Total impaired loans	0		0		0
Impaired Financing Receivables With Related Allowance [Member] | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Average current balance	1,707	358	1,641	1,278
Total impaired loans	916		916		1,509
Impaired Financing Receivables With Related Allowance [Member] | Residential real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Average current balance	670	1,042	547	1,047
Total impaired loans	1,041		1,041		301
Impaired Financing Receivables With Related Allowance [Member] | Home equity
Financing Receivable, Troubled Debt Restructuring [Line Items]
Average current balance	0	101	0	100
Total impaired loans	0		0		0
Impaired Financing Receivables With Related Allowance [Member] | Installment
Financing Receivable, Troubled Debt Restructuring [Line Items]
Average current balance	0	0	0	0
Total impaired loans	0		0		0
Impaired Financing Receivables With Related Allowance [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Average current balance	$ 8,228	$ 1,810	$ 6,402	$ 2,687
Total impaired loans					$ 2,749

LOANS AND LEASES - Investment i

LOANS AND LEASES - Investment in Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Financing Receivable, Impaired [Line Items]
Document Period End Date			Jun. 30, 2019
Financing Receivable, Nonaccrual	$ 51,351		$ 51,351		$ 70,700
Current balance	88,771		88,771		86,809
Contractual Principal Balance	102,282		102,282		104,732
Related Allowance	5,023		5,023		1,160
Average current balance	85,524	$ 53,765	85,952	$ 49,716
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	53	17	117	28
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	408	318	915	511
Interest income recognized	461	335	1,032	539
Commercial
Financing Receivable, Impaired [Line Items]
Financing Receivable, Nonaccrual	18,502		18,502		30,925
Current balance	47,384		47,384		37,633
Contractual Principal Balance	50,203		50,203		43,500
Related Allowance	4,908		4,908		667
Average current balance	40,404	10,023	39,481	9,125
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	43	6	86	6
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	212	73	491	99
Interest income recognized	255	79	577	105
Lease financing
Financing Receivable, Impaired [Line Items]
Financing Receivable, Nonaccrual	295		295		22
Current balance	295		295		22
Contractual Principal Balance	295		295		22
Related Allowance	0		0		0
Average current balance	298	0	206	27
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0	0	0	0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0	0	0	0
Interest income recognized	0	0	0	0
Construction real estate
Financing Receivable, Impaired [Line Items]
Financing Receivable, Nonaccrual	6		6		9
Current balance	6		6		9
Contractual Principal Balance	25		25		26
Related Allowance	0		0		0
Average current balance	7	25	8	26
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0	0	0	0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0	1	0	2
Interest income recognized	0	1	0	2
Commercial real estate
Financing Receivable, Impaired [Line Items]
Financing Receivable, Nonaccrual	15,981		15,981		20,500
Current balance	19,669		19,669		25,022
Contractual Principal Balance	27,196		27,196		32,884
Related Allowance	30		30		461
Average current balance	22,438	27,874	23,299	25,763
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	4	3	23	6
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	98	140	201	239
Interest income recognized	102	143	224	245
Residential real estate
Financing Receivable, Impaired [Line Items]
Financing Receivable, Nonaccrual	11,627		11,627		13,495
Current balance	15,978		15,978		17,598
Contractual Principal Balance	18,077		18,077		20,276
Related Allowance	85		85		32
Average current balance	16,457	10,215	16,837	9,454
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	6	7	8	14
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	69	76	155	123
Interest income recognized	75	83	163	137
Home equity
Financing Receivable, Impaired [Line Items]
Financing Receivable, Nonaccrual	4,745		4,745		5,580
Current balance	5,244		5,244		6,351
Contractual Principal Balance	6,158		6,158		7,461
Related Allowance	0		0		0
Average current balance	5,735	5,323	5,940	5,033
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0	1	0	2
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	28	27	66	47
Interest income recognized	28	28	66	49
Installment
Financing Receivable, Impaired [Line Items]
Financing Receivable, Nonaccrual	195		195		169
Current balance	195		195		174
Contractual Principal Balance	328		328		563
Related Allowance	0		0		0
Average current balance	185	305	181	288
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0	0	0	0
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	1	1	2	1
Interest income recognized	1	1	2	1
Loans with no related allowance recorded [member]
Financing Receivable, Impaired [Line Items]
Current balance	78,394		78,394		84,060
Contractual Principal Balance	91,905		91,905		101,983
Related Allowance	0		0		0
Average current balance	77,296	51,955	79,550	47,029
Loans with no related allowance recorded [member] | Commercial
Financing Receivable, Impaired [Line Items]
Current balance	38,964		38,964		36,694
Contractual Principal Balance	41,783		41,783		42,561
Related Allowance	0		0		0
Average current balance	34,553	9,714	35,267	8,863
Loans with no related allowance recorded [member] | Lease financing
Financing Receivable, Impaired [Line Items]
Current balance	295		295		22
Contractual Principal Balance	295		295		22
Related Allowance	0		0		0
Average current balance	298	0	206	27
Loans with no related allowance recorded [member] | Construction real estate
Financing Receivable, Impaired [Line Items]
Current balance	6		6		9
Contractual Principal Balance	25		25		26
Related Allowance	0		0		0
Average current balance	7	25	8	26
Loans with no related allowance recorded [member] | Commercial real estate
Financing Receivable, Impaired [Line Items]
Current balance	18,753		18,753		23,513
Contractual Principal Balance	26,280		26,280		31,375
Related Allowance	0		0		0
Average current balance	20,731	27,516	21,658	24,485
Loans with no related allowance recorded [member] | Residential real estate
Financing Receivable, Impaired [Line Items]
Current balance	14,937		14,937		17,297
Contractual Principal Balance	17,036		17,036		19,975
Related Allowance	0		0		0
Average current balance	15,787	9,173	16,290	8,407
Loans with no related allowance recorded [member] | Home equity
Financing Receivable, Impaired [Line Items]
Current balance	5,244		5,244		6,351
Contractual Principal Balance	6,158		6,158		7,461
Related Allowance	0		0		0
Average current balance	5,735	5,222	5,940	4,933
Loans with no related allowance recorded [member] | Installment
Financing Receivable, Impaired [Line Items]
Current balance	195		195		174
Contractual Principal Balance	328		328		563
Related Allowance	0		0		0
Average current balance	185	305	181	288
Impaired Financing Receivables With Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Current balance	10,377		10,377
Contractual Principal Balance	10,377		10,377
Related Allowance	5,023		5,023
Impaired Financing Receivables With Related Allowance [Member] | Commercial
Financing Receivable, Impaired [Line Items]
Current balance	8,420		8,420		939
Contractual Principal Balance	8,420		8,420		939
Related Allowance	4,908		4,908		667
Average current balance	5,851	309	4,214	262
Impaired Financing Receivables With Related Allowance [Member] | Lease financing
Financing Receivable, Impaired [Line Items]
Current balance	0		0		0
Contractual Principal Balance	0		0		0
Related Allowance	0		0		0
Average current balance	0	0	0	0
Impaired Financing Receivables With Related Allowance [Member] | Construction real estate
Financing Receivable, Impaired [Line Items]
Current balance	0		0		0
Contractual Principal Balance	0		0		0
Related Allowance	0		0		0
Average current balance	0	0	0	0
Impaired Financing Receivables With Related Allowance [Member] | Commercial real estate
Financing Receivable, Impaired [Line Items]
Current balance	916		916		1,509
Contractual Principal Balance	916		916		1,509
Related Allowance	30		30		461
Average current balance	1,707	358	1,641	1,278
Impaired Financing Receivables With Related Allowance [Member] | Residential real estate
Financing Receivable, Impaired [Line Items]
Current balance	1,041		1,041		301
Contractual Principal Balance	1,041		1,041		301
Related Allowance	85		85		32
Average current balance	670	1,042	547	1,047
Impaired Financing Receivables With Related Allowance [Member] | Home equity
Financing Receivable, Impaired [Line Items]
Current balance	0		0		0
Contractual Principal Balance	0		0		0
Related Allowance	0		0		0
Average current balance	0	101	0	100
Impaired Financing Receivables With Related Allowance [Member] | Installment
Financing Receivable, Impaired [Line Items]
Current balance	0		0		0
Contractual Principal Balance	0		0		0
Related Allowance	0		0		0
Average current balance	0	0	0	0
Impaired Financing Receivables With Related Allowance [Member]
Financing Receivable, Impaired [Line Items]
Current balance					2,749
Contractual Principal Balance					2,749
Related Allowance					$ 1,160
Average current balance	$ 8,228	$ 1,810	$ 6,402	$ 2,687

LOANS AND LEASES - Changes in O

LOANS AND LEASES - Changes in Other Real Estate Owned (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance at beginning of period	$ 1,665	$ 1,065	$ 1,401	$ 2,781
Additions	904	1,545	1,408	2,174
Disposals	(471)	(618)	(654)	(2,840)
Write-downs	677	139	734	262
Balance at end of period	1,421	1,853	1,421	1,853
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Additions	136	1,020	136	1,190
Disposals	(248)	(326)	(270)	(2,430)
Write-downs	55	0	55	97
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Additions	768	525	1,272	984
Disposals	(223)	(292)	(384)	(410)
Write-downs	$ 622	$ 139	$ 679	$ 165

ALLOWANCE FOR LOAN AND LEASE _3

ALLOWANCE FOR LOAN AND LEASE LOSSES - Changes in the Allowance for Loan and Lease Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Allowance for Credit Loss [Line Items]
Provision for Loan and Lease Losses	$ 6,658	$ 3,735	$ 20,741	$ 6,038
Loans and Leases Receivable, Allowance	61,549	54,076	61,549	54,076	$ 56,722	$ 56,542	$ 54,380	$ 54,021
Allowance for loan and lease losses:
Allowance for Loan and Lease Losses, Write-offs	(3,165)	(5,822)	(17,747)	(9,491)
Allowance for Loan and Lease Loss, Recovery of Bad Debts	1,334	1,783	2,013	3,508
Allowance for Loan and Lease Losses Write-offs, Net	1,831	4,039	15,734	5,983
Ending allowance on loans individually evaluated for impairment	5,023		5,023			1,160
Ending allowance on loans collectively evaluated for impairment	56,526		56,526			55,382
Loans and Leases:
Ending balance of loans individually evaluated for impairment	88,771		88,771			86,809
Ending balance of loans collectively evaluated for impairment	8,892,015		8,892,015			8,737,405
Loans and Leases Receivable, Net of Deferred Income	8,980,786		8,980,786			8,824,214
Impaired Financing Receivable, Related Allowance	61,549		61,549			56,542
Commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
Provision for Loan and Lease Losses	6,242	3,328	19,510	4,217
Loans and Leases Receivable, Allowance	24,586	17,528	24,586	17,528	19,926	18,746	18,038	17,598
Allowance for loan and lease losses:
Allowance for Loan and Lease Losses, Write-offs	(1,873)	(4,356)	(14,201)	(5,241)
Allowance for Loan and Lease Loss, Recovery of Bad Debts	291	518	531	954
Allowance for Loan and Lease Losses Write-offs, Net	1,582	3,838	13,670	4,287
Ending allowance on loans individually evaluated for impairment	4,908		4,908			667
Ending allowance on loans collectively evaluated for impairment	19,678		19,678			18,079
Loans and Leases:
Ending balance of loans individually evaluated for impairment	47,384		47,384			37,633
Ending balance of loans collectively evaluated for impairment	2,500,613		2,500,613			2,477,028
Loans and Leases Receivable, Net of Deferred Income	2,547,997		2,547,997			2,514,661
Impaired Financing Receivable, Related Allowance	24,586		24,586			18,746
Lease financing
Financing Receivable, Allowance for Credit Loss [Line Items]
Provision for Loan and Lease Losses	20	170	363	121
Loans and Leases Receivable, Allowance	1,393	797	1,393	797	1,373	1,130	626	675
Allowance for loan and lease losses:
Allowance for Loan and Lease Losses, Write-offs	0	0	(100)	0
Allowance for Loan and Lease Loss, Recovery of Bad Debts	0	1	0	1
Allowance for Loan and Lease Losses Write-offs, Net	0	(1)	100	(1)
Ending allowance on loans individually evaluated for impairment	0		0			0
Ending allowance on loans collectively evaluated for impairment	1,393		1,393			1,130
Loans and Leases:
Ending balance of loans individually evaluated for impairment	295		295			22
Ending balance of loans collectively evaluated for impairment	90,343		90,343			93,393
Loans and Leases Receivable, Net of Deferred Income	90,638		90,638			93,415
Impaired Financing Receivable, Related Allowance	1,393		1,393			1,130
Construction real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Provision for Loan and Lease Losses	121	(282)	(562)	408
Loans and Leases Receivable, Allowance	2,919	3,985	2,919	3,985	2,793	3,413	4,267	3,577
Allowance for loan and lease losses:
Allowance for Loan and Lease Losses, Write-offs	0	0	0	0
Allowance for Loan and Lease Loss, Recovery of Bad Debts	5	0	68	0
Allowance for Loan and Lease Losses Write-offs, Net	(5)	0	(68)	0
Ending allowance on loans individually evaluated for impairment	0		0			0
Ending allowance on loans collectively evaluated for impairment	2,919		2,919			3,413
Loans and Leases:
Ending balance of loans individually evaluated for impairment	6		6			9
Ending balance of loans collectively evaluated for impairment	497,677		497,677			548,926
Loans and Leases Receivable, Net of Deferred Income	497,683		497,683			548,935
Impaired Financing Receivable, Related Allowance	2,919		2,919			3,413
Commercial real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Provision for Loan and Lease Losses	(211)	(619)	282	196
Loans and Leases Receivable, Allowance	20,357	20,511	20,357	20,511	20,400	21,048	20,321	20,930
Allowance for loan and lease losses:
Allowance for Loan and Lease Losses, Write-offs	(86)	(78)	(1,300)	(2,254)
Allowance for Loan and Lease Loss, Recovery of Bad Debts	254	887	327	1,639
Allowance for Loan and Lease Losses Write-offs, Net	(168)	(809)	973	615
Ending allowance on loans individually evaluated for impairment	30		30			461
Ending allowance on loans collectively evaluated for impairment	20,327		20,327			20,587
Loans and Leases:
Ending balance of loans individually evaluated for impairment	19,669		19,669			25,022
Ending balance of loans collectively evaluated for impairment	3,883,985		3,883,985			3,729,659
Loans and Leases Receivable, Net of Deferred Income	3,903,654		3,903,654			3,754,681
Impaired Financing Receivable, Related Allowance	20,357		20,357			21,048
Residential real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Provision for Loan and Lease Losses	14	(28)	139	86
Loans and Leases Receivable, Allowance	5,008	4,668	5,008	4,668	5,043	4,964	4,727	4,683
Allowance for loan and lease losses:
Allowance for Loan and Lease Losses, Write-offs	(150)	(101)	(232)	(197)
Allowance for Loan and Lease Loss, Recovery of Bad Debts	101	70	137	96
Allowance for Loan and Lease Losses Write-offs, Net	49	31	95	101
Ending allowance on loans individually evaluated for impairment	85		85			32
Ending allowance on loans collectively evaluated for impairment	4,923		4,923			4,932
Loans and Leases:
Ending balance of loans individually evaluated for impairment	15,978		15,978			17,598
Ending balance of loans collectively evaluated for impairment	999,842		999,842			938,048
Loans and Leases Receivable, Net of Deferred Income	1,015,820		1,015,820			955,646
Impaired Financing Receivable, Related Allowance	5,008		5,008			4,964
Home equity
Financing Receivable, Allowance for Credit Loss [Line Items]
Provision for Loan and Lease Losses	174	171	359	(123)
Loans and Leases Receivable, Allowance	5,307	4,801	5,307	4,801	5,250	5,348	4,828	4,935
Allowance for loan and lease losses:
Allowance for Loan and Lease Losses, Write-offs	(689)	(385)	(1,157)	(627)
Allowance for Loan and Lease Loss, Recovery of Bad Debts	572	187	757	616
Allowance for Loan and Lease Losses Write-offs, Net	117	198	400	11
Ending allowance on loans individually evaluated for impairment	0		0			0
Ending allowance on loans collectively evaluated for impairment	5,307		5,307			5,348
Loans and Leases:
Ending balance of loans individually evaluated for impairment	5,244		5,244			6,351
Ending balance of loans collectively evaluated for impairment	781,895		781,895			810,931
Loans and Leases Receivable, Net of Deferred Income	787,139		787,139			817,282
Impaired Financing Receivable, Related Allowance	5,307		5,307			5,348
Installment
Loans and Leases:
Loans and Leases Receivable, Net of Deferred Income	89,149		89,149			93,212
Installment
Financing Receivable, Allowance for Credit Loss [Line Items]
Provision for Loan and Lease Losses	32	136	51	87
Loans and Leases Receivable, Allowance	395	290	395	290	380	362	290	307
Allowance for loan and lease losses:
Allowance for Loan and Lease Losses, Write-offs	(78)	(218)	(127)	(234)
Allowance for Loan and Lease Loss, Recovery of Bad Debts	61	82	109	130
Allowance for Loan and Lease Losses Write-offs, Net	17	136	18	104
Ending allowance on loans individually evaluated for impairment	0		0			0
Ending allowance on loans collectively evaluated for impairment	395		395			362
Loans and Leases:
Ending balance of loans individually evaluated for impairment	195		195			174
Ending balance of loans collectively evaluated for impairment	88,954		88,954			93,038
Loans and Leases Receivable, Net of Deferred Income	1,940,814		1,940,814			1,912,522
Impaired Financing Receivable, Related Allowance	395		395			362
Credit card
Financing Receivable, Allowance for Credit Loss [Line Items]
Provision for Loan and Lease Losses	266	859	599	1,046
Loans and Leases Receivable, Allowance	1,584	1,496	1,584	1,496	$ 1,557	1,531	$ 1,283	$ 1,316
Allowance for loan and lease losses:
Allowance for Loan and Lease Losses, Write-offs	(289)	(684)	(630)	(938)
Allowance for Loan and Lease Loss, Recovery of Bad Debts	50	38	84	72
Allowance for Loan and Lease Losses Write-offs, Net	(239)	$ (646)	(546)	$ (866)
Ending allowance on loans individually evaluated for impairment	0		0			0
Ending allowance on loans collectively evaluated for impairment	1,584		1,584			1,531
Loans and Leases:
Ending balance of loans individually evaluated for impairment	0		0			0
Ending balance of loans collectively evaluated for impairment	48,706		48,706			46,382
Loans and Leases Receivable, Net of Deferred Income	48,706		48,706			46,382
Impaired Financing Receivable, Related Allowance	$ 1,584		$ 1,584			$ 1,531

GOODWILL AND OTHER INTANGIBLE_2

GOODWILL AND OTHER INTANGIBLE ASSETS--Schedule of Goodwill (Details) - USD ($) $ in Thousands	Apr. 01, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Goodwill [Roll Forward]
Balance at beginning of period		$ 880,251	$ 204,084	$ 204,084
Goodwill resulting from business combinations	$ 675,643	(524)	$ 678,941	676,167
Balance at end of period		$ 879,727		$ 880,251

GOODWILL AND OTHER INTANGIBLE_3

GOODWILL AND OTHER INTANGIBLE ASSETS--Additional Information (Details) - USD ($) $ in Thousands	Apr. 01, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Goodwill resulting from business combinations	$ 675,643			$ (524)	$ 678,941	$ 676,167
Goodwill		$ 879,727		879,727		880,251	$ 204,084
Intangible Assets, Net (Excluding Goodwill)		36,300		36,300		40,800
Finite-Lived Core Deposits, Gross		33,800		33,800		$ 37,900
Other Depreciation and Amortization		2,000		4,100	2,600
Amortization of Intangible Assets		$ 2,044	$ 2,364	$ 4,089	$ 2,644
Core Deposits [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets amortization method				accelerated basis
Estimated weighted average life (in years)				8 years 4 months 24 days

LEASES - Lease Cost (Details)

LEASES - Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2019
Lease, Cost [Abstract]
Operating Lease, Cost	$ 1,822	$ 3,648
Short-term Lease, Cost	0	1
Variable Lease, Cost	633	1,230
Lease, Cost	$ 2,455	$ 4,879

LEASES - Lease Maturity (Detail

LEASES - Lease Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019
Leases [Abstract]
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year	$ 3,770
Lessee, Operating Lease, Liability, Payments, Due Year Two	7,469
Lessee, Operating Lease, Liability, Payments, Due Year Three	7,093
Lessee, Operating Lease, Liability, Payments, Due Year Four	6,741
Lessee, Operating Lease, Liability, Payments, Due Year Five	6,695
Lessee, Operating Lease, Liability, Payments, Due after Year Five	55,530
Lessee, Operating Lease, Liability, Payments, Due	87,298
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	21,794
Operating Lease, Liability	$ 65,504	$ 65,800

LEASES - Schedule of supplement

LEASES - Schedule of supplemental balance sheet information related to assets (Details)	Jun. 30, 2019
Leases [Abstract]
Operating Lease, Weighted Average Remaining Lease Term	16 years 6 months
Operating Lease, Weighted Average Discount Rate, Percent	3.40%

LEASES - Supplemental cash flow

LEASES - Supplemental cash flow information related to leases (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Leases [Abstract]
Operating cash flows from operating leases	$ 3,759	$ 0
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 64,938

LEASES - Additional Information

LEASES - Additional Information (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019
Leases [Abstract]
Operating Lease, Right-of-Use Asset	$ 59,900	$ 60,200
Operating Lease, Liability	$ 65,504	$ 65,800

BORROWINGS - Repurchase Agreeme

BORROWINGS - Repurchase Agreements (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Securities Sold under Agreements to Repurchase	$ 85,621
Carrying Value of Securities Sold under Repurchase Agreements and Deposits Received for Securities Loaned	85,700	$ 85,500
Residential Mortgage Backed Securities [Member]
Securities Sold under Agreements to Repurchase	25,966
Collateralized Mortgage Obligations [Member]
Securities Sold under Agreements to Repurchase	$ 59,655

BORROWINGS Borrowings - - Addit

BORROWINGS Borrowings - - Additional Information (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Carrying Value of Securities Sold under Repurchase Agreements and Deposits Received for Securities Loaned	$ 85,700	$ 85,500
Federal Funds Purchased	175,000	99,000
FHLB short-term borrowings	1,052,700	857,100
Line of Credit Facility, Maximum Borrowing Capacity	30,000
Commitments outstanding to extend credit	0	0
Long-term Debt	547,042	570,739
Subordinated debt	$ 120,000
Subordinated Borrowing, Interest Rate	5.125%
Subordinated debt	$ 170,758	$ 170,550
Debt, Weighted Average Interest Rate	5.13%	5.28%
Advances from Federal Home Loan Banks	$ 376,605	$ 400,599
Federal Home Loan Bank	2.13%	2.08%
Private Placement [Member]
Subordinated debt	$ 8,400
Debt, Weighted Average Interest Rate	7.40%
Private Placement [Member]
DebtInstrumentMinimumCallablePeriod	5 years
Subordinated Debt [Member]
Subordinated debt	$ 49,500
Debt Instrument Maturity Period	30 years
DebtInstrumentMinimumCallablePeriod	5 years

BORROWINGS - Schedule of Long-t

BORROWINGS - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Amount
Subordinated debt	$ 170,758	$ 170,550
Unamortized debt issuance costs	(1,096)	(1,185)
FHLB long-term advances	376,605	400,599
Capital loan with municipality	775	775
Total long-term debt	$ 547,042	$ 570,739
Average Rate
Debt, Weighted Average Interest Rate	5.13%	5.28%
Federal Home Loan Bank	2.13%	2.08%
Weighted average rate on other long-term debt	0.00%	0.00%
Total long-term debt	3.07%	3.04%

ACCUMULATED OTHER COMPREHENSI_3

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Other Comprehensive Income (Loss), before Reclassification Adjustments and Tax [Abstract]
Unrealized gain (loss) on investment securities	$ 31,144	$ (11,456)	$ 60,869	$ (23,992)
Unrealized gain (loss) on derivatives	94	203	187	405
Retirement obligation	0	0	0	0
Total	31,238	(11,253)	61,056	(23,587)
Other Comprehensive Income (Loss) Reclassifications before Tax [Abstract]
Realized gain (loss) on securities available-for-sale	(37)	(30)	(215)	(30)
Unrealized gain (loss) on derivatives	0	0	0	0
Retirement obligation	(320)	(452)	(695)	(871)
Total	(357)	(482)	(910)	(901)
Transactions Pre-tax
Unrealized gain (loss) on investment securities	31,181	(11,426)	61,084	(23,962)
Unrealized gain (loss) on derivatives	94	203	187	405
Unfunded pension obligation	320	452	695	871
Total	31,595	(10,771)	61,966	(22,686)
Transactions Tax-effect
Unrealized gain (loss) on investment securities	(6,671)	2,448	(13,069)	5,154
Unrealized gain (loss) on derivatives	(22)	(44)	(43)	(90)
Retirement obligation	(74)	42	(159)	(54)
Total	(6,767)	2,446	(13,271)	5,010
Transactions Net of tax
Unrealized gain (loss) on investment securities	24,510	(8,978)	48,015	(18,808)
Unrealized gain (loss) on derivatives	72	159	144	315
Retirement obligation	246	494	536	817
Total	24,828	(8,325)	48,695	(17,676)
Cumulative effect of new standard
Unrealized gain (loss) on investment securities			906	(190)
Unrealized gain (loss) on Derivatives			0	(124)
Retirement obligation			0	(4,779)
Total			906	(5,093)
Balances Net of tax
Unrealized gain (loss) on investment securities	37,320	(19,180)	37,320	(19,180)	$ 12,810	$ (11,601)	$ (10,202)	$ (182)
Unrealized gain (loss) on cash flow hedges	(73)	(386)	(73)	(386)	(145)	(217)	(545)	(577)
Retirement obligation	(32,054)	(23,593)	(32,054)	(23,593)	(32,300)	(32,590)	(24,087)	(19,631)
Total	5,193	(43,159)	5,193	(43,159)	$ (19,635)	$ (44,408)	$ (34,834)	$ (20,390)
Accumulated other comprehensive income (loss)
Transactions Net of tax
Total	$ 24,828	$ (8,325)	$ 48,695	$ (17,676)

ACCUMULATED OTHER COMPREHENSI_4

ACCUMULATED OTHER COMPREHENSIVE INCOME AMOUNT RECLASSIFIED FROM ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Other Accumulated Comprehensive income reclassified from AOCI [Line Items]
Realized gain (loss) on securities available-for-sale	$ (37)	$ (30)	$ (215)	$ (30)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	106	103	206	206
Defined Benefit Plan, Amortization of Gain (Loss)	(426)	(555)	(901)	(1,077)
Other Comprehensive Income, Reclassification, Amortization of Defined Benefit Plans items, Pre-tax	(320)	(452)	(695)	(871)
Total	$ (357)	$ (482)	$ (910)	$ (901)

DERIVATIVES - Additional Inform

DERIVATIVES - Additional Information (Details) $ in Thousands	Jun. 30, 2019USD ($)entity	Dec. 31, 2018USD ($)entity
Derivative [Line Items]
Inerest-bearing deposit liability	$ 3,170,900	$ 2,719,980
Number of counterparties | entity	16	13
Derivative Financial Instruments, Liabilities, Fair Value Disclosure	$ 68,932	$ 29,188
Interest Rate Lock Commitments [Member]
Derivative [Line Items]
Inerest-bearing deposit liability	52,800	20,800
Other Credit Derivatives [Member]
Derivative [Line Items]
Inerest-bearing deposit liability	52,800	12,300
Credit Risk Derivative Liabilities, at Fair Value	0	0
Credit Risk Contract [Member]
Derivative [Line Items]
Inerest-bearing deposit liability	155,600	138,400
Credit Risk Derivative Liabilities, at Fair Value	300	100
Accrued interest and other liabilities | Derivative [Member]
Derivative [Line Items]
Inerest-bearing deposit liability	1,600,000	1,400,000
Derivative Financial Instruments, Liabilities, Fair Value Disclosure	$ 64,100	$ 4,900

DERIVATIVES - Summary of Deriva

DERIVATIVES - Summary of Derivative Financial Instruments and Balances (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Inerest-bearing deposit liability	$ 3,170,900	$ 2,719,980
Derivative Asset	68,912	29,189
Estimate Fair Value Loss	(68,932)	(29,188)
Other Credit Derivatives [Member]
Derivatives, Fair Value [Line Items]
Inerest-bearing deposit liability	52,800	12,300
Credit Risk Derivative Liabilities, at Fair Value	0	0
Fair Value Hedges | Matched interest rate swaps | Accrued interest and other liabilities
Derivatives, Fair Value [Line Items]
Inerest-bearing deposit liability	1,585,450	1,359,990
Derivative Asset	2,275	11,787
Estimate Fair Value Loss	(66,657)	(17,401)
Fair Value Hedges | Matched interest rate swaps | Accrued interest and other assets
Derivatives, Fair Value [Line Items]
Inerest-bearing deposit liability	1,585,450	1,359,990
Derivative Asset	66,637	17,402
Estimate Fair Value Loss	$ (2,275)	$ (11,787)

DERIVATIVES - Disclosure by Typ

DERIVATIVES - Disclosure by Type of Financial Instrument (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Credit Risk Contract [Member]
Derivatives, Fair Value [Line Items]
Credit Risk Derivative Liabilities, at Fair Value	$ 300	$ 100
Fair Value Hedges | Matched interest rate swaps | Accrued interest and other liabilities
Derivatives, Fair Value [Line Items]
Gross amounts of recognized liabilities	68,932	29,189
Derivative Liability, Fair Value, Gross Asset	(71,750)	(14,577)
Derivative Liability, Fair Value, Amount Not Offset Against Collateral		$ (14,612)
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	$ (2,818)

DERIVATIVES - Derivative Financ

DERIVATIVES - Derivative Financial Instruments, Average Remaining Maturity and the Weighted-Average Interest Rates being Paid and Received (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Derivative [Line Items]
Notional Value	$ 3,170,900	$ 2,719,980
Interest Rate Swap
Derivative [Line Items]
Notional Value	$ 3,170,900
Average Maturity (years)	6 years 2 months 12 days
Fair Value	$ (20)
Weighted-Average Rate Receive	4.68%
Weighted-Average Rate Pay	4.68%
Interest Rate Swap | Derivative Financial Instruments Receive Fixed Pay Variable
Derivative [Line Items]
Notional Value	$ 1,585,450
Average Maturity (years)	6 years 2 months 12 days
Fair Value	$ 64,362
Weighted-Average Rate Receive	4.69%
Weighted-Average Rate Pay	4.66%
Interest Rate Swap | Derivative Financial Instruments Receive Variable Pay Fixed
Derivative [Line Items]
Notional Value	$ 1,585,450
Average Maturity (years)	6 years 2 months 12 days
Fair Value	$ (64,382)
Weighted-Average Rate Receive	4.66%
Weighted-Average Rate Pay	4.69%

COMMITMENTS AND CONTINGENCIES (

COMMITMENTS AND CONTINGENCIES (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Commitments and Contingencies Disclosure [Line Items]
Reserves for unfunded commitments	$ 600,000		$ 600,000		$ 700,000
Commitments outstanding to extend credit	0		0		0
Loans and Leases Receivable, Commitments, Fixed Rates			188,400,000		174,000,000
Loans and Leases Receivable, Commitments, Variable Rates			$ 3,100,000,000		$ 2,900,000,000
Loan Commitments, Fixed Interest Rate Range, Minimum			0.00%
Loan Commitments, Fixed Interest Rate Range, Maximum			21.00%
Loan Commitments, Fixed Rate, Maturities, Minimum			1 year		1 year
Loan Commitments, Fixed Rate, Maturities, Maximum			30 years		30 years
Letters of credit issued to guarantee performance of a client to a third party	32,500,000		$ 32,500,000		$ 32,700,000
Affordable Housing Program Obligation	33,500,000		33,500,000		39,400,000
Amortization Method Qualified Affordable Housing Project Investments, Amortization	2,100,000	$ 1,600,000	3,800,000	$ 2,800,000
Affordable housing contingent commitment	0		0		0
Variable Interest Entity, Nonconsolidated, Carrying Amount, Assets	3,700,000		3,700,000		3,900,000
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	3,700,000		3,700,000		3,900,000
Estimated Litigation Liability	0		0		0
Commitments to Extend Credit
Commitments and Contingencies Disclosure [Line Items]
Commitments outstanding to extend credit	3,300,000,000		3,300,000,000		3,000,000,000
Affordable housing investment [Member]
Commitments and Contingencies Disclosure [Line Items]
Low-income housing tax credit	1,600,000	1,200,000	3,200,000	2,300,000
Historic tax credit [Member]
Commitments and Contingencies Disclosure [Line Items]
Low-income housing tax credit	$ 100,000	$ 100,000	$ 100,000	$ 200,000
Maximum [Member]
Commitments and Contingencies Disclosure [Line Items]
Loans and Leases Receivable, Commitments, Variable Rates					0.210
Minimum [Member]
Commitments and Contingencies Disclosure [Line Items]
Loans and Leases Receivable, Commitments, Variable Rates					$ 0

INCOME TAXES (Details)

INCOME TAXES (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income tax expense	$ 13,201	$ 9,327	$ 23,122	$ 16,980
Effective tax rate	20.00%	20.40%	19.00%	20.20%
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 2,400		$ 2,400		$ 2,900
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense			$ 0		$ 0

EMPLOYEE BENEFIT PLANS - Additi

EMPLOYEE BENEFIT PLANS - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Retirement Benefits [Abstract]
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year	$ 0		$ 0
Payment for Pension Benefits			0		$ 0
Pension Cost (Reversal of Cost)	$ 145,000	$ 338,000	$ 520,000	$ 182,000

EMPLOYEE BENEFIT PLANS - Employ

EMPLOYEE BENEFIT PLANS - Employee benefit plan amounts recognized in the Consolidated Balance Sheets and Consolidated Statements of Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Retirement Benefits [Abstract]
Service cost	$ 1,545	$ 1,735	$ 3,295	$ 3,030
Interest cost	689	601	1,389	1,191
Expected return on plan assets	(2,409)	(2,450)	(4,859)	(4,910)
Amortization of prior service cost	(106)	(103)	(206)	(206)
Defined Benefit Plan, Amortization of Gain (Loss)	426	555	901	1,077
Net periodic benefit cost (income)	$ 145	$ 338	$ 520	$ 182

REVENUE RECOGNITION (Details)

REVENUE RECOGNITION (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenue Recognition [Abstract]
Interchange income	$ 6.7	$ 8.1	$ 15.2	$ 13.5
Credit card expense	$ 2.1	$ 2.8	$ 5	$ 4.8

EARNINGS PER COMMON SHARE - Com

EARNINGS PER COMMON SHARE - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Numerator for basic and diluted earnings per share -income available to common shareholders:
Net income	$ 52,703	$ 36,418	$ 98,542	$ 66,924
Denominator for basic earnings per share - weighted average shares	98,083,799	97,347,533	98,005,379	79,599,709
Effect of dilutive securities -
Employee stock awards	564,585	545,374	537,568	504,914
Warrants	0	539,165	0	524,872
Denominator for diluted earnings per share - adjusted weighted average shares	98,648,384	98,432,072	98,542,947	80,629,495
Basic	$ 0.54	$ 0.37	$ 1.01	$ 0.84
Diluted	$ 0.53	$ 0.37	$ 1	$ 0.83

EARNINGS PER COMMON SHARE - Add

EARNINGS PER COMMON SHARE - Additional Information (Details) - $ / shares	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share Disclosure [Line Items]
Investment Warrants, Exercise Price		$ 12.11
Antidilutive Warrants
Earnings Per Share Disclosure [Line Items]
Stock options and warrants with an exercise price greater than the average market price of the common shares not included in the computation of net income per diluted share	0	22,698
Antidilutive Stock Options
Earnings Per Share Disclosure [Line Items]
Stock options and warrants with an exercise price greater than the average market price of the common shares not included in the computation of net income per diluted share	0	0

FAIR VALUE DISCLOSURES - Estima

FAIR VALUE DISCLOSURES - Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Financial Instruments, Liabilities, Fair Value Disclosure	$ 68,932	$ 29,188
Financial assets
Investment securities held-to-maturity	154,327	429,328
Other investments	127,439	115,660
Deposits
Noninterest-bearing	2,501,290	2,492,434
Savings	2,953,114	3,167,325
Time	2,321,908	2,173,564
Carrying value
Financial assets
Cash and short-term investments	271,362	273,959
Investment securities held-to-maturity	154,327	429,328
Other investments	127,439	115,660
Loans held for sale	20,244	4,372
Loans and leases	8,919,237	8,767,672
Interest Receivable	44,474	41,816
Deposits
Deposits	10,109,004	10,140,394
Short-term borrowings	1,313,321	1,040,691
Long-term debt	547,042	570,739
Interest Payable	12,730	12,126
Fair value
Financial assets
Cash and short-term investments	271,362	273,959
Investment securities held-to-maturity	153,039	424,118
Loans held for sale	20,244	4,372
Loans and leases	8,850,385	8,662,868
Interest Receivable	44,474	41,816
Deposits
Deposits	10,102,924	10,113,475
Short-term borrowings	1,313,321	1,040,691
Long-term debt	545,983	557,933
Interest Payable	12,730	12,126
Fair Value, Inputs, Level 1 [Member] | Fair value
Financial assets
Cash and short-term investments	271,362	273,959
Investment securities held-to-maturity	0	0
Loans held for sale	0	0
Loans and leases	0	0
Interest Receivable	0	0
Deposits
Deposits	0	0
Short-term borrowings	1,313,321	1,040,691
Long-term debt	0	0
Interest Payable	2,859	2,035
Fair Value, Inputs, Level 2 [Member] | Fair value
Financial assets
Cash and short-term investments	0	0
Investment securities held-to-maturity	153,039	424,118
Loans held for sale	20,244	4,372
Loans and leases	0	0
Interest Receivable	14,287	13,819
Deposits
Deposits	10,102,924	10,113,475
Short-term borrowings	0	0
Long-term debt	545,983	557,933
Interest Payable	9,871	10,091
Fair Value, Inputs, Level 3 [Member] | Fair value
Financial assets
Cash and short-term investments	0	0
Investment securities held-to-maturity	0	0
Loans held for sale	0	0
Loans and leases	8,850,385	8,662,868
Interest Receivable	30,187	27,997
Deposits
Deposits	0	0
Short-term borrowings	0	0
Long-term debt	0	0
Interest Payable	$ 0	$ 0

FAIR VALUE DISCLOSURES - Summar

FAIR VALUE DISCLOSURES - Summary of Financial Assets and Liabilities Measure at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Assets
Derivatives	$ 68,912	$ 29,189
Investment securities available-for-sale	3,152,970	2,779,255
Liabilities
Derivatives	68,932	29,188
Fair Value, Measurements, Recurring
Assets
Derivatives	69,038	29,543
Investment securities available-for-sale	3,152,970	2,779,255
Total	3,222,008	2,808,798
Liabilities
Derivatives	69,470	29,336
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 1
Assets
Derivatives	0	0
Investment securities available-for-sale	100	97
Total	100	97
Liabilities
Derivatives	0	0
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 2
Assets
Derivatives	69,038	29,543
Investment securities available-for-sale	3,140,072	2,764,443
Total	3,209,110	2,793,986
Liabilities
Derivatives	69,470	29,336
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 3
Assets
Derivatives	0	0
Investment securities available-for-sale	12,798	14,715
Total	12,798	14,715
Liabilities
Derivatives	$ 0	$ 0

FAIR VALUE DISCLOSURES - Reconc

FAIR VALUE DISCLOSURES - Reconciliation of Gains and Losses on Level 3 Assets (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 13,355	$ 14,715
Accretion (amortization)	(569)	(562)
Increase (decrease) in fair value	12	33
Settlements	0	(1,388)
Ending balance	$ 12,798	$ 12,798

FAIR VALUE DISCLOSURES - Summ_2

FAIR VALUE DISCLOSURES - Summary of Financial Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis (Details) - Fair Value, Measurements, Nonrecurring - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Fair Value Measurements Using Level 1
Assets
Impaired loans	$ 0	$ 0
Other Real Estate Owned, Fair Value Disclosure	0	0
Fair Value Measurements Using Level 2
Assets
Impaired loans	0	0
Other Real Estate Owned, Fair Value Disclosure	0	0
Fair Value Measurements Using Level 3
Assets
Impaired loans	4,398	1,320
Other Real Estate Owned, Fair Value Disclosure	$ 953	$ 1,089

BUSINESS COMBINATION - Addition

BUSINESS COMBINATION - Additional Information (Details) - USD ($) $ in Thousands	Apr. 01, 2018	Jun. 30, 2019	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Business Acquisition [Line Items]
Business Acquisition, Number Of Shares Received by Acquiree	1.3875
Business Combination, Consideration Transferred	$ 1,059,504	$ 117,000
Goodwill	675,643		$ (524)	$ 678,941	$ 676,167
Payments for Merger Related Costs		$ 800	$ 2,400		$ 37,800
Loans	2,792,572
Business Combination, Acquired Receivables, Gross Contractual Amount	$ 2,900,000

BUSINESS COMBINATIONS (Details)

BUSINESS COMBINATIONS (Details) - USD ($) $ in Thousands	Apr. 01, 2018	Jun. 30, 2019	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Business Acquisition [Line Items]
Cash consideration	$ 43
Stock consideration	1,043,424
Warrant consideration	14,460
Options consideration	1,577
Total purchase consideration	1,059,504	$ 117,000
Cash	71,806
Investment securities available-for-sale	900,935
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Held to Maturity Securities	171,423
Other investments	28,763
Loans	2,792,572
Premises and equipment	98,814
Intangible assets	42,887
Other assets	167,829
Assets held for sale	127,775
Total assets acquired	4,402,804
Deposits	3,263,920
Subordinated notes	49,027
FHLB advances	291,887
Other borrowings	205,620
Other liabilities	32,649
Liabilities held for sale	175,840
Total liabilities assumed	4,018,943	$ (5)	$ (5)	$ 4,007,743
Net identifiable assets	383,861
Goodwill	$ 675,643		$ (524)	$ 678,941	$ 676,167

BUSINESS COMBINATION Business A

BUSINESS COMBINATION Business Acquisition, Pro Forma Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Business Combinations [Abstract]
Business Acquisition, Pro Forma Revenue	$ 484,915	$ 454,579
Business Acquisition, Pro Forma Net Income (Loss)	$ 221,122	$ 130,402
Business Acquisition, Pro Forma Earnings Per Share, Basic	$ 2.27	$ 1.34
Business Acquisition, Pro Forma Earnings Per Share, Diluted	$ 2.25	$ 1.33