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LOANS - Summary of Past Due Loans for Acquired 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
Financing Receivable, Past Due [Line Items]
Total loans	4,034,269	3,400,221
Commercial real estate | Construction
Financing Receivable, Past Due [Line Items]
Total loans	429,806	353,012
Commercial real estate | 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
Acquired Loans
Financing Receivable, Past Due [Line Items]
Total Past Due	20,793	14,227
Acquired Credit Impaired	61,419	47,288
Total loans	2,335,931	1,676,509
Past Due greater than 90 days and Accruing	6,404	1,967
Acquired Loans | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	14,399	7,913
Acquired Credit Impaired	23,035	11,994
Total loans	1,237,313	811,510
Past Due greater than 90 days and Accruing	5,751	1,652
Acquired Loans | Commercial real estate | Construction
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Acquired Credit Impaired	1,396	0
Total loans	47,792	25,220
Past Due greater than 90 days and Accruing	0	0
Acquired Loans | Commercial real estate | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	14,399	7,913
Acquired Credit Impaired	21,639	11,994
Total loans	1,189,521	786,290
Past Due greater than 90 days and Accruing	5,751	1,652
Acquired Loans | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total Past Due	2,462	1,879
Acquired Credit Impaired	26,718	29,539
Total loans	397,891	466,508
Past Due greater than 90 days and Accruing	442	144
Acquired Loans | Residential
Financing Receivable, Past Due [Line Items]
Total Past Due	2,168	2,444
Acquired Credit Impaired	10,840	4,888
Total loans	537,014	239,126
Past Due greater than 90 days and Accruing	139	75
Acquired Loans | Residential | Construction
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Acquired Credit Impaired	0	0
Total loans	3,478	174
Past Due greater than 90 days and Accruing	0	0
Acquired Loans | Residential | 1-4 family
Financing Receivable, Past Due [Line Items]
Total Past Due	2,168	2,444
Acquired Credit Impaired	10,840	4,888
Total loans	533,536	238,952
Past Due greater than 90 days and Accruing	139	75
Acquired Loans | Consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	1,764	1,991
Acquired Credit Impaired	826	867
Total loans	163,713	159,365
Past Due greater than 90 days and Accruing	72	96
Acquired Loans | Consumer | Home equity
Financing Receivable, Past Due [Line Items]
Total Past Due	1,357	1,189
Acquired Credit Impaired	540	553
Total loans	106,724	86,719
Past Due greater than 90 days and Accruing	72	0
Acquired Loans | Consumer | Auto and other
Financing Receivable, Past Due [Line Items]
Total Past Due	407	802
Acquired Credit Impaired	286	314
Total loans	56,989	72,646
Past Due greater than 90 days and Accruing	0	96
Acquired Loans | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	6,006	4,685
Acquired Loans | 30-59 Days Past Due | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	3,907	2,603
Acquired Loans | 30-59 Days Past Due | Commercial real estate | Construction
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Acquired Loans | 30-59 Days Past Due | Commercial real estate | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	3,907	2,603
Acquired Loans | 30-59 Days Past Due | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total Past Due	888	217
Acquired Loans | 30-59 Days Past Due | Residential
Financing Receivable, Past Due [Line Items]
Total Past Due	745	1,382
Acquired Loans | 30-59 Days Past Due | Residential | Construction
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Acquired Loans | 30-59 Days Past Due | Residential | 1-4 family
Financing Receivable, Past Due [Line Items]
Total Past Due	745	1,382
Acquired Loans | 30-59 Days Past Due | Consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	466	483
Acquired Loans | 30-59 Days Past Due | Consumer | Home equity
Financing Receivable, Past Due [Line Items]
Total Past Due	346	290
Acquired Loans | 30-59 Days Past Due | Consumer | Auto and other
Financing Receivable, Past Due [Line Items]
Total Past Due	120	193
Acquired Loans | 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	1,279	1,628
Acquired Loans | 60-89 Days Past Due | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	245	1,127
Acquired Loans | 60-89 Days Past Due | Commercial real estate | Construction
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Acquired Loans | 60-89 Days Past Due | Commercial real estate | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	245	1,127
Acquired Loans | 60-89 Days Past Due | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total Past Due	299	147
Acquired Loans | 60-89 Days Past Due | Residential
Financing Receivable, Past Due [Line Items]
Total Past Due	491	144
Acquired Loans | 60-89 Days Past Due | Residential | Construction
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Acquired Loans | 60-89 Days Past Due | Residential | 1-4 family
Financing Receivable, Past Due [Line Items]
Total Past Due	491	144
Acquired Loans | 60-89 Days Past Due | Consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	244	210
Acquired Loans | 60-89 Days Past Due | Consumer | Home equity
Financing Receivable, Past Due [Line Items]
Total Past Due	222	148
Acquired Loans | 60-89 Days Past Due | Consumer | Auto and other
Financing Receivable, Past Due [Line Items]
Total Past Due	22	62
Acquired Loans | 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	13,508	7,914
Acquired Loans | 90 Days Past Due | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	10,247	4,183
Acquired Loans | 90 Days Past Due | Commercial real estate | Construction
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Acquired Loans | 90 Days Past Due | Commercial real estate | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	10,247	4,183
Acquired Loans | 90 Days Past Due | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total Past Due	1,275	1,515
Acquired Loans | 90 Days Past Due | Residential
Financing Receivable, Past Due [Line Items]
Total Past Due	932	918
Acquired Loans | 90 Days Past Due | Residential | Construction
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Acquired Loans | 90 Days Past Due | Residential | 1-4 family
Financing Receivable, Past Due [Line Items]
Total Past Due	932	918
Acquired Loans | 90 Days Past Due | Consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	1,054	1,298
Acquired Loans | 90 Days Past Due | Consumer | Home equity
Financing Receivable, Past Due [Line Items]
Total Past Due	789	751
Acquired Loans | 90 Days Past Due | Consumer | Auto and other
Financing Receivable, Past Due [Line Items]
Total Past Due	$ 265	$ 547

X

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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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