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LOANS - Summary of Past Due Loans (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Total loans | $ 9,941,828 | $ 9,043,253
Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 4,005,347 | 3,400,221
Commercial real estate | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 359,493 | 353,012
Commercial real estate | Other |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 3,645,854 | 3,047,209
Commercial and industrial loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 1,987,297 | 1,980,046
Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 2,882,380 | 2,566,424
Residential mortgages | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 17,328 | 9,756
Residential mortgages | 1-4 family |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 2,865,052 | 2,556,668
Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 1,066,804 | 1,096,562
Consumer | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 403,830 | 376,680
Consumer | Auto and other |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans | 662,974 | 719,882
Business Activities Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 43,614 | 42,440
Current | 7,250,791 | 7,324,304
Total loans | 7,294,405 | 7,366,744
Past Due 90 days and Accruing | 2,845 | 1,063
Business Activities Loans | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 7,015 | 11,399
Business Activities Loans | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 3,050 | 3,500
Business Activities Loans | 90 Days or Greater Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 33,549 | 27,541
Business Activities Loans | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 18,241 | 20,022
Current | 2,641,257 | 2,568,689
Total loans | 2,659,498 | 2,588,711
Past Due 90 days and Accruing | 0 | 993
Business Activities Loans | Commercial real estate | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Current | 300,996 | 327,792
Total loans | 300,996 | 327,792
Past Due 90 days and Accruing | 0 | 0
Business Activities Loans | Commercial real estate | Other |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 18,241 | 20,022
Current | 2,340,261 | 2,240,897
Total loans | 2,358,502 | 2,260,919
Past Due 90 days and Accruing | 0 | 993
Business Activities Loans | Commercial real estate | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 388 | 913
Business Activities Loans | Commercial real estate | 30-59 Days Past Due | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Business Activities Loans | Commercial real estate | 30-59 Days Past Due | Other |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 388 | 913
Business Activities Loans | Commercial real estate | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 478 | 276
Business Activities Loans | Commercial real estate | 60-89 Days Past Due | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Business Activities Loans | Commercial real estate | 60-89 Days Past Due | Other |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 478 | 276
Business Activities Loans | Commercial real estate | 90 Days or Greater Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 17,375 | 18,833
Business Activities Loans | Commercial real estate | 90 Days or Greater Past Due | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Business Activities Loans | Commercial real estate | 90 Days or Greater Past Due | Other |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 17,375 | 18,833
Business Activities Loans | Commercial and industrial loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 12,744 | 10,305
Current | 1,459,022 | 1,503,233
Total loans | 1,471,766 | 1,513,538
Past Due 90 days and Accruing | 1,422 | 4
Business Activities Loans | Commercial and industrial loans | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 2,071 | 4,694
Business Activities Loans | Commercial and industrial loans | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 784 | 975
Business Activities Loans | Commercial and industrial loans | 90 Days or Greater Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 9,889 | 4,636
Business Activities Loans | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 4,914 | 4,690
Current | 2,272,701 | 2,322,608
Total loans | 2,277,615 | 2,327,298
Past Due 90 days and Accruing | 1,258 | 66
Business Activities Loans | Residential mortgages | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Current | 9,170 | 9,582
Total loans | 9,170 | 9,582
Past Due 90 days and Accruing | 0 | 0
Business Activities Loans | Residential mortgages | 1-4 family |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 4,914 | 4,690
Current | 2,263,531 | 2,313,026
Total loans | 2,268,445 | 2,317,716
Past Due 90 days and Accruing | 1,258 | 66
Business Activities Loans | Residential mortgages | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 867 | 1,631
Business Activities Loans | Residential mortgages | 30-59 Days Past Due | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Business Activities Loans | Residential mortgages | 30-59 Days Past Due | 1-4 family |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 867 | 1,631
Business Activities Loans | Residential mortgages | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 543 | 1,619
Business Activities Loans | Residential mortgages | 60-89 Days Past Due | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Business Activities Loans | Residential mortgages | 60-89 Days Past Due | 1-4 family |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 543 | 1,619
Business Activities Loans | Residential mortgages | 90 Days or Greater Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 3,504 | 1,440
Business Activities Loans | Residential mortgages | 90 Days or Greater Past Due | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Business Activities Loans | Residential mortgages | 90 Days or Greater Past Due | 1-4 family |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 3,504 | 1,440
Business Activities Loans | Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 7,715 | 7,423
Current | 877,811 | 929,774
Total loans | 885,526 | 937,197
Past Due 90 days and Accruing | 165 | 0
Business Activities Loans | Consumer | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 1,752 | 1,566
Current | 279,502 | 288,395
Total loans | 281,254 | 289,961
Past Due 90 days and Accruing | 165 | 0
Business Activities Loans | Consumer | Auto and other |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 5,963 | 5,857
Current | 598,309 | 641,379
Total loans | 604,272 | 647,236
Past Due 90 days and Accruing | 0 | 0
Business Activities Loans | Consumer | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 3,689 | 4,161
Business Activities Loans | Consumer | 30-59 Days Past Due | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 191 | 618
Business Activities Loans | Consumer | 30-59 Days Past Due | Auto and other |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 3,498 | 3,543
Business Activities Loans | Consumer | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 1,245 | 630
Business Activities Loans | Consumer | 60-89 Days Past Due | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 582 | 15
Business Activities Loans | Consumer | 60-89 Days Past Due | Auto and other |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 663 | 615
Business Activities Loans | Consumer | 90 Days or Greater Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 2,781 | 2,632
Business Activities Loans | Consumer | 90 Days or Greater Past Due | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 979 | 933
Business Activities Loans | Consumer | 90 Days or Greater Past Due | Auto and other |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 1,802 | 1,699
Acquired Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 12,735 | 14,227
Acquired Credit Impaired | 74,092 | 47,288
Total loans | 2,647,423 | 1,676,509
Past Due 90 days and Accruing | 2,812 | 1,967
Acquired Loans | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 3,570 | 4,685
Acquired Loans | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 1,286 | 1,628
Acquired Loans | 90 Days or Greater Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 7,879 | 7,914
Acquired Loans | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 6,125 | 7,913
Acquired Credit Impaired | 29,623 | 11,994
Total loans | 1,345,849 | 811,510
Past Due 90 days and Accruing | 2,441 | 1,652
Acquired Loans | Commercial real estate | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Acquired Credit Impaired | 1,411 | 0
Total loans | 58,497 | 25,220
Past Due 90 days and Accruing | 0 | 0
Acquired Loans | Commercial real estate | Other |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 6,125 | 7,913
Acquired Credit Impaired | 28,212 | 11,994
Total loans | 1,287,352 | 786,290
Past Due 90 days and Accruing | 2,441 | 1,652
Acquired Loans | Commercial real estate | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 998 | 2,603
Acquired Loans | Commercial real estate | 30-59 Days Past Due | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Acquired Loans | Commercial real estate | 30-59 Days Past Due | Other |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 998 | 2,603
Acquired Loans | Commercial real estate | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 695 | 1,127
Acquired Loans | Commercial real estate | 60-89 Days Past Due | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Acquired Loans | Commercial real estate | 60-89 Days Past Due | Other |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 695 | 1,127
Acquired Loans | Commercial real estate | 90 Days or Greater Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 4,432 | 4,183
Acquired Loans | Commercial real estate | 90 Days or Greater Past Due | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Acquired Loans | Commercial real estate | 90 Days or Greater Past Due | Other |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 4,432 | 4,183
Acquired Loans | Commercial and industrial loans |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 2,120 | 1,879
Acquired Credit Impaired | 31,456 | 29,539
Total loans | 515,531 | 466,508
Past Due 90 days and Accruing | 214 | 144
Acquired Loans | Commercial and industrial loans | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 1,055 | 217
Acquired Loans | Commercial and industrial loans | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 62 | 147
Acquired Loans | Commercial and industrial loans | 90 Days or Greater Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 1,003 | 1,515
Acquired Loans | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 2,866 | 2,444
Acquired Credit Impaired | 12,050 | 4,888
Total loans | 604,765 | 239,126
Past Due 90 days and Accruing | 75 | 75
Acquired Loans | Residential mortgages | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Acquired Credit Impaired | 0 | 0
Total loans | 8,158 | 174
Past Due 90 days and Accruing | 0 | 0
Acquired Loans | Residential mortgages | 1-4 family |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 2,866 | 2,444
Acquired Credit Impaired | 12,050 | 4,888
Total loans | 596,607 | 238,952
Past Due 90 days and Accruing | 75 | 75
Acquired Loans | Residential mortgages | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 970 | 1,382
Acquired Loans | Residential mortgages | 30-59 Days Past Due | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Acquired Loans | Residential mortgages | 30-59 Days Past Due | 1-4 family |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 970 | 1,382
Acquired Loans | Residential mortgages | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 488 | 144
Acquired Loans | Residential mortgages | 60-89 Days Past Due | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Acquired Loans | Residential mortgages | 60-89 Days Past Due | 1-4 family |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 488 | 144
Acquired Loans | Residential mortgages | 90 Days or Greater Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 1,408 | 918
Acquired Loans | Residential mortgages | 90 Days or Greater Past Due | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 0 | 0
Acquired Loans | Residential mortgages | 90 Days or Greater Past Due | 1-4 family |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 1,408 | 918
Acquired Loans | Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 1,624 | 1,991
Acquired Credit Impaired | 963 | 867
Total loans | 181,278 | 159,365
Past Due 90 days and Accruing | 82 | 96
Acquired Loans | Consumer | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 1,106 | 1,189
Acquired Credit Impaired | 700 | 553
Total loans | 122,576 | 86,719
Past Due 90 days and Accruing | 82 | 0
Acquired Loans | Consumer | Auto and other |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 518 | 802
Acquired Credit Impaired | 263 | 314
Total loans | 58,702 | 72,646
Past Due 90 days and Accruing | 0 | 96
Acquired Loans | Consumer | 30-59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 547 | 483
Acquired Loans | Consumer | 30-59 Days Past Due | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 379 | 290
Acquired Loans | Consumer | 30-59 Days Past Due | Auto and other |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 168 | 193
Acquired Loans | Consumer | 60-89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 41 | 210
Acquired Loans | Consumer | 60-89 Days Past Due | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 0 | 148
Acquired Loans | Consumer | 60-89 Days Past Due | Auto and other |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 41 | 62
Acquired Loans | Consumer | 90 Days or Greater Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 1,036 | 1,298
Acquired Loans | Consumer | 90 Days or Greater Past Due | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | 727 | 751
Acquired Loans | Consumer | 90 Days or Greater Past Due | Auto and other |  |
Financing Receivable, Past Due [Line Items] |  |
Total Past Due | $ 309 | $ 547

X
- Definition The recorded balance, net of any applicable reductions (for example, unamortized accretable yield and allowance for loan losses). This relates to loans not accounted for debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=118939070&loc=d3e15032-111544 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118938799&loc=d3e13503-111538 + Details
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- Definition Amount of financing receivable 90 days or more past due and still accruing. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 16 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919258-210447 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5111-111524 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 80 -URI http://asc.fasb.org/extlink&oid=118955255&loc=SL82922355-210448 + Details
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- Definition 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 -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5074-111524 + Details
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