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LOAN LOSS ALLOWANCE - Loans by Risk Rating (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	$ 9,502,428	$ 9,043,253
Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	75,284	47,166
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	122,424	109,490
Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	4,034,269	3,400,221
Commercial real estate | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	429,806	353,012
Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,840,508	1,980,046
Residential mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,685,472	2,566,424
Residential mortgages | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	8,119	9,756
Residential mortgages | 1-4 family
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,677,353	2,556,668
Consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	942,179	1,096,562
Consumer loans | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	380,591	376,680
Consumer loans | Auto and other
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	561,588	719,882
Business Activities Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	7,166,497	7,366,744
Business Activities Loans | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	63,943	26,333
Business Activities Loans | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	49,293	60,698
Business Activities Loans | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,796,956	2,588,711
Business Activities Loans | Commercial real estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,736,389	2,525,921
Business Activities Loans | Commercial real estate | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	12,167	9,805
Business Activities Loans | Commercial real estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	48,400	52,985
Business Activities Loans | Commercial real estate | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0	0
Business Activities Loans | Commercial real estate | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	382,014	327,792
Business Activities Loans | Commercial real estate | Construction | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	382,014	327,792
Business Activities Loans | Commercial real estate | Construction | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0	0
Business Activities Loans | Commercial real estate | Construction | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0	0
Business Activities Loans | Commercial real estate | Construction | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0	0
Business Activities Loans | Commercial real estate | Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,414,942	2,260,919
Business Activities Loans | Commercial real estate | Real Estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,354,375	2,198,129
Business Activities Loans | Commercial real estate | Real Estate | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	12,167	9,805
Business Activities Loans | Commercial real estate | Real Estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	48,400	52,985
Business Activities Loans | Commercial real estate | Real Estate | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0	0
Business Activities Loans | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,442,617	1,513,538
Business Activities Loans | Commercial and industrial | Commercial Loan
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,442,617	1,513,538
Business Activities Loans | Commercial and industrial | Commercial Loan | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,366,342	1,469,139
Business Activities Loans | Commercial and industrial | Commercial Loan | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	50,072	14,279
Business Activities Loans | Commercial and industrial | Commercial Loan | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	24,112	29,176
Business Activities Loans | Commercial and industrial | Commercial Loan | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,091	944
Business Activities Loans | Residential mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,148,458	2,327,298
Business Activities Loans | Residential mortgages | Mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,148,458	2,327,298
Business Activities Loans | Residential mortgages | Mortgages | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,144,394	2,324,239
Business Activities Loans | Residential mortgages | Mortgages | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	714	1,619
Business Activities Loans | Residential mortgages | Mortgages | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	3,350	1,440
Business Activities Loans | Residential mortgages | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	4,641	9,582
Business Activities Loans | Residential mortgages | Construction | Mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	4,641	9,582
Business Activities Loans | Residential mortgages | Construction | Mortgages | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	4,641	9,582
Business Activities Loans | Residential mortgages | Construction | Mortgages | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0	0
Business Activities Loans | Residential mortgages | Construction | Mortgages | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0	0
Business Activities Loans | Residential mortgages | 1-4 family
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,143,817	2,317,716
Business Activities Loans | Residential mortgages | 1-4 family | Mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,143,817	2,317,716
Business Activities Loans | Residential mortgages | 1-4 family | Mortgages | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,139,753	2,314,657
Business Activities Loans | Residential mortgages | 1-4 family | Mortgages | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	714	1,619
Business Activities Loans | Residential mortgages | 1-4 family | Mortgages | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	3,350	1,440
Business Activities Loans | Consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	778,466	937,197
Business Activities Loans | Consumer loans | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	774,643	934,565
Business Activities Loans | Consumer loans | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	3,823	2,632
Business Activities Loans | Consumer loans | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	273,867	289,961
Business Activities Loans | Consumer loans | Home equity | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	272,772	289,028
Business Activities Loans | Consumer loans | Home equity | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,095	933
Business Activities Loans | Consumer loans | Auto and other
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	504,599	647,236
Business Activities Loans | Consumer loans | Auto and other | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	501,871	645,537
Business Activities Loans | Consumer loans | Auto and other | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,728	1,699
Acquired Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,335,931	1,676,509
Acquired Loans | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	11,341	20,833
Acquired Loans | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	73,131	48,792
Acquired Loans | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,237,313	811,510
Acquired Loans | Commercial real estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,176,729	768,203
Acquired Loans | Commercial real estate | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	5,993	9,086
Acquired Loans | Commercial real estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	54,591	34,221
Acquired Loans | Commercial real estate | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	47,792	25,220
Acquired Loans | Commercial real estate | Construction | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	46,396	24,519
Acquired Loans | Commercial real estate | Construction | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0	0
Acquired Loans | Commercial real estate | Construction | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,396	701
Acquired Loans | Commercial real estate | Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,189,521	786,290
Acquired Loans | Commercial real estate | Real Estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,130,333	743,684
Acquired Loans | Commercial real estate | Real Estate | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	5,993	9,086
Acquired Loans | Commercial real estate | Real Estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	53,195	33,520
Acquired Loans | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	397,891	466,508
Acquired Loans | Commercial and industrial | Commercial Loan
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	397,891	466,509
Acquired Loans | Commercial and industrial | Commercial Loan | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	373,744	439,603
Acquired Loans | Commercial and industrial | Commercial Loan | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	4,404	11,374
Acquired Loans | Commercial and industrial | Commercial Loan | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	19,743	15,532
Acquired Loans | Residential mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	537,014	239,126
Acquired Loans | Residential mortgages | Mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	537,014	239,126
Acquired Loans | Residential mortgages | Mortgages | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	531,760	235,347
Acquired Loans | Residential mortgages | Mortgages | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	592	144
Acquired Loans | Residential mortgages | Mortgages | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	4,662	3,635
Acquired Loans | Residential mortgages | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	3,478	174
Acquired Loans | Residential mortgages | Construction | Mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	3,478	174
Acquired Loans | Residential mortgages | Construction | Mortgages | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	3,478	174
Acquired Loans | Residential mortgages | Construction | Mortgages | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0	0
Acquired Loans | Residential mortgages | Construction | Mortgages | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0	0
Acquired Loans | Residential mortgages | 1-4 family
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	533,536	238,952
Acquired Loans | Residential mortgages | 1-4 family | Mortgages
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	533,536	238,952
Acquired Loans | Residential mortgages | 1-4 family | Mortgages | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	528,282	235,173
Acquired Loans | Residential mortgages | 1-4 family | Mortgages | Special mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	592	144
Acquired Loans | Residential mortgages | 1-4 family | Mortgages | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	4,662	3,635
Acquired Loans | Consumer loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	163,713	159,365
Acquired Loans | Consumer loans | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	162,731	158,163
Acquired Loans | Consumer loans | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	982	1,202
Acquired Loans | Consumer loans | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	106,724	86,719
Acquired Loans | Consumer loans | Home equity | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	106,007	85,968
Acquired Loans | Consumer loans | Home equity | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	717	751
Acquired Loans | Consumer loans | Auto and other
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	56,989	72,646
Acquired Loans | Consumer loans | Auto and other | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	56,724	72,195
Acquired Loans | Consumer loans | Auto and other | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	$ 265	$ 451

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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
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-Topic 310
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-Section 50
-Paragraph 4
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