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LOANS - Summary of Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 9,502,428	$ 9,043,253
Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	5,874,777	5,380,267
Commercial real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	4,034,269	3,400,221
Commercial real estate loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	429,806	353,012
Commercial real estate loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	3,604,463	3,047,209
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,840,508	1,980,046
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	2,685,472	2,566,424
Residential | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	8,119	9,756
Residential | 1-4 family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	2,677,353	2,556,668
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	942,179	1,096,562
Consumer | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	380,591	376,680
Consumer | Auto and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	561,588	719,882
Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	7,166,497	7,366,744
Business Activities Loans | Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	4,239,573	4,102,249
Business Activities Loans | Commercial real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	2,796,956	2,588,711
Business Activities Loans | Commercial real estate loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	382,014	327,792
Business Activities Loans | Commercial real estate loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	2,414,942	2,260,919
Business Activities Loans | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,442,617	1,513,538
Business Activities Loans | Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	2,148,458	2,327,298
Business Activities Loans | Residential | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	4,641	9,582
Business Activities Loans | Residential | 1-4 family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	2,143,817	2,317,716
Business Activities Loans | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	778,466	937,197
Business Activities Loans | Consumer | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	273,867	289,961
Business Activities Loans | Consumer | Auto and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	504,599	647,236
Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	2,335,931	1,676,509
Acquired Loans | Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,635,204	1,278,018
Acquired Loans | Commercial real estate loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,237,313	811,510
Acquired Loans | Commercial real estate loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	47,792	25,220
Acquired Loans | Commercial real estate loans | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,189,521	786,290
Acquired Loans | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	397,891	466,508
Acquired Loans | Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	537,014	239,126
Acquired Loans | Residential | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	3,478	174
Acquired Loans | Residential | 1-4 family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	533,536	238,952
Acquired Loans | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	163,713	159,365
Acquired Loans | Consumer | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	106,724	86,719
Acquired Loans | Consumer | Auto and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 56,989	$ 72,646

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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5074-111524

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