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LOAN LOSS ALLOWANCE - Loans by Credit Risk Rating (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Credit quality information
Total loans	$ 9,941,828	$ 9,043,253
Special mention
Credit quality information
Total loans	108,671	47,166
Substandard
Credit quality information
Total loans	122,812	109,490
Non-Accrual
Credit quality information
Total loans	35,771	32,425
Classified
Credit quality information
Total loans	158,583	141,915
Criticized
Credit quality information
Total loans	267,254	189,081
Commercial real estate
Credit quality information
Total loans	4,005,347	3,400,221
Commercial real estate | Construction
Credit quality information
Total loans	359,493	353,012
Commercial and industrial loans
Credit quality information
Total loans	1,987,297	1,980,046
Residential mortgages
Credit quality information
Total loans	2,882,380	2,566,424
Residential mortgages | Construction
Credit quality information
Total loans	17,328	9,756
Residential mortgages | 1-4 family
Credit quality information
Total loans	2,865,052	2,556,668
Consumer
Credit quality information
Total loans	1,066,804	1,096,562
Consumer | Home equity
Credit quality information
Total loans	403,830	376,680
Consumer | Auto and other
Credit quality information
Total loans	662,974	719,882
Business Activities Loans
Credit quality information
Total loans	7,294,405	7,366,744
Business Activities Loans | Special mention
Credit quality information
Total loans	79,484	26,333
Business Activities Loans | Substandard
Credit quality information
Total loans	59,206	60,698
Business Activities Loans | Non-Accrual
Credit quality information
Total loans	30,704	26,478
Business Activities Loans | Classified
Credit quality information
Total loans	89,910	87,176
Business Activities Loans | Criticized
Credit quality information
Total loans	169,394	113,509
Business Activities Loans | Commercial real estate
Credit quality information
Total loans	2,659,498	2,588,711
Business Activities Loans | Commercial real estate | Pass
Credit quality information
Total loans	2,584,240	2,525,921
Business Activities Loans | Commercial real estate | Special mention
Credit quality information
Total loans	24,154	9,805
Business Activities Loans | Commercial real estate | Substandard
Credit quality information
Total loans	51,104	52,985
Business Activities Loans | Commercial real estate | Construction
Credit quality information
Total loans	300,996	327,792
Business Activities Loans | Commercial real estate | Construction | Pass
Credit quality information
Total loans	300,996	327,792
Business Activities Loans | Commercial real estate | Construction | Special mention
Credit quality information
Total loans	0	0
Business Activities Loans | Commercial real estate | Construction | Substandard
Credit quality information
Total loans	0	0
Business Activities Loans | Commercial real estate | Real Estate
Credit quality information
Total loans	2,358,502	2,260,919
Business Activities Loans | Commercial real estate | Real Estate | Pass
Credit quality information
Total loans	2,283,244	2,198,129
Business Activities Loans | Commercial real estate | Real Estate | Special mention
Credit quality information
Total loans	24,154	9,805
Business Activities Loans | Commercial real estate | Real Estate | Substandard
Credit quality information
Total loans	51,104	52,985
Business Activities Loans | Commercial and industrial loans
Credit quality information
Total loans	1,471,766	1,513,538
Business Activities Loans | Commercial and industrial loans | Pass
Credit quality information
Total loans	1,385,702	1,469,139
Business Activities Loans | Commercial and industrial loans | Special mention
Credit quality information
Total loans	53,543	14,279
Business Activities Loans | Commercial and industrial loans | Substandard
Credit quality information
Total loans	31,617	29,176
Business Activities Loans | Commercial and industrial loans | Doubtful
Credit quality information
Total loans	904	944
Business Activities Loans | Residential mortgages
Credit quality information
Total loans	2,277,615	2,327,298
Business Activities Loans | Residential mortgages | Pass
Credit quality information
Total loans	2,273,568	2,324,239
Business Activities Loans | Residential mortgages | Special mention
Credit quality information
Total loans	543	1,619
Business Activities Loans | Residential mortgages | Substandard
Credit quality information
Total loans	3,504	1,440
Business Activities Loans | Residential mortgages | Construction
Credit quality information
Total loans	9,170	9,582
Business Activities Loans | Residential mortgages | Construction | Pass
Credit quality information
Total loans	9,170	9,582
Business Activities Loans | Residential mortgages | Construction | Special mention
Credit quality information
Total loans	0	0
Business Activities Loans | Residential mortgages | Construction | Substandard
Credit quality information
Total loans	0	0
Business Activities Loans | Residential mortgages | 1-4 family
Credit quality information
Total loans	2,268,445	2,317,716
Business Activities Loans | Residential mortgages | 1-4 family | Pass
Credit quality information
Total loans	2,264,398	2,314,657
Business Activities Loans | Residential mortgages | 1-4 family | Special mention
Credit quality information
Total loans	543	1,619
Business Activities Loans | Residential mortgages | 1-4 family | Substandard
Credit quality information
Total loans	3,504	1,440
Business Activities Loans | Consumer
Credit quality information
Total loans	885,526	937,197
Business Activities Loans | Consumer | Performing
Credit quality information
Total loans	882,909	934,565
Business Activities Loans | Consumer | Nonperforming
Credit quality information
Total loans	2,617	2,632
Business Activities Loans | Consumer | Home equity
Credit quality information
Total loans	281,254	289,961
Business Activities Loans | Consumer | Home equity | Performing
Credit quality information
Total loans	280,440	289,028
Business Activities Loans | Consumer | Home equity | Nonperforming
Credit quality information
Total loans	814	933
Business Activities Loans | Consumer | Auto and other
Credit quality information
Total loans	604,272	647,236
Business Activities Loans | Consumer | Auto and other | Performing
Credit quality information
Total loans	602,469	645,537
Business Activities Loans | Consumer | Auto and other | Nonperforming
Credit quality information
Total loans	1,803	1,699
Acquired Loans
Credit quality information
Total loans	2,647,423	1,676,509
Acquired Loans | Special mention
Credit quality information
Total loans	29,187	20,833
Acquired Loans | Substandard
Credit quality information
Total loans	63,606	48,792
Acquired Loans | Non-Accrual
Credit quality information
Total loans	5,067	5,947
Acquired Loans | Classified
Credit quality information
Total loans	68,673	54,739
Acquired Loans | Criticized
Credit quality information
Total loans	97,860	75,572
Acquired Loans | Commercial real estate
Credit quality information
Total loans	1,345,849	811,510
Acquired Loans | Commercial real estate | Pass
Credit quality information
Total loans	1,287,546	768,203
Acquired Loans | Commercial real estate | Special mention
Credit quality information
Total loans	15,558	9,086
Acquired Loans | Commercial real estate | Substandard
Credit quality information
Total loans	42,745	34,221
Acquired Loans | Commercial real estate | Construction
Credit quality information
Total loans	58,497	25,220
Acquired Loans | Commercial real estate | Construction | Pass
Credit quality information
Total loans	56,384	24,519
Acquired Loans | Commercial real estate | Construction | Special mention
Credit quality information
Total loans	1,411	0
Acquired Loans | Commercial real estate | Construction | Substandard
Credit quality information
Total loans	702	701
Acquired Loans | Commercial real estate | Real Estate
Credit quality information
Total loans	1,287,352	786,290
Acquired Loans | Commercial real estate | Real Estate | Pass
Credit quality information
Total loans	1,231,162	743,684
Acquired Loans | Commercial real estate | Real Estate | Special mention
Credit quality information
Total loans	14,147	9,086
Acquired Loans | Commercial real estate | Real Estate | Substandard
Credit quality information
Total loans	42,043	33,520
Acquired Loans | Commercial and industrial loans
Credit quality information
Total loans	515,531	466,508
Acquired Loans | Commercial and industrial loans | Pass
Credit quality information
Total loans	483,151	439,602
Acquired Loans | Commercial and industrial loans | Special mention
Credit quality information
Total loans	12,893	11,374
Acquired Loans | Commercial and industrial loans | Substandard
Credit quality information
Total loans	19,487	15,532
Acquired Loans | Residential mortgages
Credit quality information
Total loans	604,765	239,126
Acquired Loans | Residential mortgages | Pass
Credit quality information
Total loans	598,736	235,347
Acquired Loans | Residential mortgages | Special mention
Credit quality information
Total loans	696	144
Acquired Loans | Residential mortgages | Substandard
Credit quality information
Total loans	5,333	3,635
Acquired Loans | Residential mortgages | Construction
Credit quality information
Total loans	8,158	174
Acquired Loans | Residential mortgages | Construction | Pass
Credit quality information
Total loans	8,158	174
Acquired Loans | Residential mortgages | Construction | Special mention
Credit quality information
Total loans	0	0
Acquired Loans | Residential mortgages | Construction | Substandard
Credit quality information
Total loans	0	0
Acquired Loans | Residential mortgages | 1-4 family
Credit quality information
Total loans	596,607	238,952
Acquired Loans | Residential mortgages | 1-4 family | Pass
Credit quality information
Total loans	590,578	235,173
Acquired Loans | Residential mortgages | 1-4 family | Special mention
Credit quality information
Total loans	696	144
Acquired Loans | Residential mortgages | 1-4 family | Substandard
Credit quality information
Total loans	5,333	3,635
Acquired Loans | Consumer
Credit quality information
Total loans	181,278	159,365
Acquired Loans | Consumer | Performing
Credit quality information
Total loans	180,324	158,163
Acquired Loans | Consumer | Nonperforming
Credit quality information
Total loans	954	1,202
Acquired Loans | Consumer | Home equity
Credit quality information
Total loans	122,576	86,719
Acquired Loans | Consumer | Home equity | Performing
Credit quality information
Total loans	121,931	85,968
Acquired Loans | Consumer | Home equity | Nonperforming
Credit quality information
Total loans	645	751
Acquired Loans | Consumer | Auto and other
Credit quality information
Total loans	58,702	72,646
Acquired Loans | Consumer | Auto and other | Performing
Credit quality information
Total loans	58,393	72,195
Acquired Loans | Consumer | Auto and other | Nonperforming
Credit quality information
Total loans	$ 309	$ 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.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
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-Publisher FASB
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