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LOANS - Summary of Past Due Loans for Business Activities Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Past Due [Line Items]
Total loans	$ 9,502,428	$ 9,043,253
Commercial real estate loans
Financing Receivable, Past Due [Line Items]
Total loans	4,034,269	3,400,221
Commercial real estate loans | Construction
Financing Receivable, Past Due [Line Items]
Total loans	429,806	353,012
Commercial real estate loans | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total loans	3,604,463	3,047,209
Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total loans	1,840,508	1,980,046
Residential
Financing Receivable, Past Due [Line Items]
Total loans	2,685,472	2,566,424
Residential | Construction
Financing Receivable, Past Due [Line Items]
Total loans	8,119	9,756
Residential | 1-4 family
Financing Receivable, Past Due [Line Items]
Total loans	2,677,353	2,556,668
Consumer
Financing Receivable, Past Due [Line Items]
Total loans	942,179	1,096,562
Consumer | Home equity
Financing Receivable, Past Due [Line Items]
Total loans	380,591	376,680
Consumer | Auto and other
Financing Receivable, Past Due [Line Items]
Total loans	561,588	719,882
Business Activities Loans
Financing Receivable, Past Due [Line Items]
Total Past Due	47,128	42,440
Current	7,119,369	7,324,304
Total loans	7,166,497	7,366,744
Past Due greater than 90 days and Accruing	975	1,063
Business Activities Loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	9,791	11,399
Business Activities Loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	3,826	3,500
Business Activities Loans | 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	33,511	27,541
Business Activities Loans | Commercial real estate loans
Financing Receivable, Past Due [Line Items]
Total Past Due	16,135	20,022
Current	2,780,821	2,568,689
Total loans	2,796,956	2,588,711
Past Due greater than 90 days and Accruing	0	993
Business Activities Loans | Commercial real estate loans | Construction
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Current	382,014	327,792
Total loans	382,014	327,792
Past Due greater than 90 days and Accruing	0	0
Business Activities Loans | Commercial real estate loans | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	16,135	20,022
Current	2,398,807	2,240,897
Total loans	2,414,942	2,260,919
Past Due greater than 90 days and Accruing	0	993
Business Activities Loans | Commercial real estate loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	423	913
Business Activities Loans | Commercial real estate loans | 30-59 Days Past Due | Construction
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Business Activities Loans | Commercial real estate loans | 30-59 Days Past Due | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	423	913
Business Activities Loans | Commercial real estate loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	89	276
Business Activities Loans | Commercial real estate loans | 60-89 Days Past Due | Construction
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Business Activities Loans | Commercial real estate loans | 60-89 Days Past Due | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	89	276
Business Activities Loans | Commercial real estate loans | 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	15,623	18,833
Business Activities Loans | Commercial real estate loans | 90 Days Past Due | Construction
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Business Activities Loans | Commercial real estate loans | 90 Days Past Due | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	15,623	18,833
Business Activities Loans | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total Past Due	15,536	10,305
Current	1,427,081	1,503,233
Total loans	1,442,617	1,513,538
Past Due greater than 90 days and Accruing	122	4
Business Activities Loans | Commercial and industrial | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	2,841	4,694
Business Activities Loans | Commercial and industrial | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	2,033	975
Business Activities Loans | Commercial and industrial | 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	10,662	4,363
Business Activities Loans | Residential
Financing Receivable, Past Due [Line Items]
Total Past Due	5,733	4,690
Current	2,142,725	2,322,608
Total loans	2,148,458	2,327,298
Past Due greater than 90 days and Accruing	800	66
Business Activities Loans | Residential | Construction
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Current	4,641	9,582
Total loans	4,641	9,582
Past Due greater than 90 days and Accruing	0	0
Business Activities Loans | Residential | 1-4 family
Financing Receivable, Past Due [Line Items]
Total Past Due	5,733	4,690
Current	2,138,084	2,313,026
Total loans	2,143,817	2,317,716
Past Due greater than 90 days and Accruing	800	66
Business Activities Loans | Residential | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	1,669	1,631
Business Activities Loans | Residential | 30-59 Days Past Due | Construction
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Business Activities Loans | Residential | 30-59 Days Past Due | 1-4 family
Financing Receivable, Past Due [Line Items]
Total Past Due	1,669	1,631
Business Activities Loans | Residential | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	714	1,619
Business Activities Loans | Residential | 60-89 Days Past Due | Construction
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Business Activities Loans | Residential | 60-89 Days Past Due | 1-4 family
Financing Receivable, Past Due [Line Items]
Total Past Due	714	1,619
Business Activities Loans | Residential | 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	3,350	1,440
Business Activities Loans | Residential | 90 Days Past Due | Construction
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Business Activities Loans | Residential | 90 Days Past Due | 1-4 family
Financing Receivable, Past Due [Line Items]
Total Past Due	3,350	1,440
Business Activities Loans | Consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	9,724	7,423
Current	768,742	929,774
Total loans	778,466	937,197
Past Due greater than 90 days and Accruing	53	0
Business Activities Loans | Consumer | Home equity
Financing Receivable, Past Due [Line Items]
Total Past Due	1,296	1,566
Current	272,571	288,395
Total loans	273,867	289,961
Past Due greater than 90 days and Accruing	52	0
Business Activities Loans | Consumer | Auto and other
Financing Receivable, Past Due [Line Items]
Total Past Due	8,428	5,857
Current	496,171	641,379
Total loans	504,599	647,236
Past Due greater than 90 days and Accruing	1	0
Business Activities Loans | Consumer | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	4,858	4,161
Business Activities Loans | Consumer | 30-59 Days Past Due | Home equity
Financing Receivable, Past Due [Line Items]
Total Past Due	149	618
Business Activities Loans | Consumer | 30-59 Days Past Due | Auto and other
Financing Receivable, Past Due [Line Items]
Total Past Due	4,709	3,543
Business Activities Loans | Consumer | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	990	630
Business Activities Loans | Consumer | 60-89 Days Past Due | Home equity
Financing Receivable, Past Due [Line Items]
Total Past Due	0	15
Business Activities Loans | Consumer | 60-89 Days Past Due | Auto and other
Financing Receivable, Past Due [Line Items]
Total Past Due	990	615
Business Activities Loans | Consumer | 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	3,876	2,632
Business Activities Loans | Consumer | 90 Days Past Due | Home equity
Financing Receivable, Past Due [Line Items]
Total Past Due	1,147	933
Business Activities Loans | Consumer | 90 Days Past Due | Auto and other
Financing Receivable, Past Due [Line Items]
Total Past Due	$ 2,729	$ 1,699

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Amount of financing receivable 90 days or more past due and still accruing.

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Amount of financing receivable not past due.

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