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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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