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LOANS - Summary of Total Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 9,941,828	$ 9,043,253
Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	7,294,405	7,366,744
Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	2,647,423	1,676,509
Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	5,992,644	5,380,267
Commercial loans | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	4,131,264	4,102,249
Commercial loans | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	1,861,380	1,278,018
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	4,005,347	3,400,221
Commercial real estate | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	2,659,498	2,588,711
Commercial real estate | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	1,345,849	811,510
Commercial real estate | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	359,493	353,012
Commercial real estate | Construction | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	300,996	327,792
Commercial real estate | Construction | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	58,497	25,220
Commercial real estate | Other commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	3,645,854	3,047,209
Commercial real estate | Other commercial real estate | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	2,358,502	2,260,919
Commercial real estate | Other commercial real estate | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	1,287,352	786,290
Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	1,987,297	1,980,046
Commercial and industrial loans | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	1,471,766	1,513,538
Commercial and industrial loans | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	515,531	466,508
Residential mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	2,882,380	2,566,424
Residential mortgages | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	2,277,615	2,327,298
Residential mortgages | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	604,765	239,126
Residential mortgages | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	17,328	9,756
Residential mortgages | Construction | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	9,170	9,582
Residential mortgages | Construction | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	8,158	174
Residential mortgages | 1-4 family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	2,865,052	2,556,668
Residential mortgages | 1-4 family | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	2,268,445	2,317,716
Residential mortgages | 1-4 family | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	596,607	238,952
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	1,066,804	1,096,562
Consumer | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	885,526	937,197
Consumer | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	181,278	159,365
Consumer | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	403,830	376,680
Consumer | Home equity | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	281,254	289,961
Consumer | Home equity | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	122,576	86,719
Consumer | Auto and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	662,974	719,882
Consumer | Auto and other | Business Activities Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	604,272	647,236
Consumer | Auto and other | Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 58,702	$ 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

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-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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