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LOANS - Summary of Total Loans (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | $ 9,941,828 | $ 9,043,253
Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 7,294,405 | 7,366,744
Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 2,647,423 | 1,676,509
Commercial loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 5,992,644 | 5,380,267
Commercial loans | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 4,131,264 | 4,102,249
Commercial loans | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 1,861,380 | 1,278,018
Commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 4,005,347 | 3,400,221
Commercial real estate | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 2,659,498 | 2,588,711
Commercial real estate | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 1,345,849 | 811,510
Commercial real estate | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 359,493 | 353,012
Commercial real estate | Construction | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 300,996 | 327,792
Commercial real estate | Construction | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 58,497 | 25,220
Commercial real estate | Other commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 3,645,854 | 3,047,209
Commercial real estate | Other commercial real estate | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 2,358,502 | 2,260,919
Commercial real estate | Other commercial real estate | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 1,287,352 | 786,290
Commercial and industrial loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 1,987,297 | 1,980,046
Commercial and industrial loans | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 1,471,766 | 1,513,538
Commercial and industrial loans | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 515,531 | 466,508
Residential mortgages |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 2,882,380 | 2,566,424
Residential mortgages | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 2,277,615 | 2,327,298
Residential mortgages | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 604,765 | 239,126
Residential mortgages | Construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 17,328 | 9,756
Residential mortgages | Construction | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 9,170 | 9,582
Residential mortgages | Construction | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 8,158 | 174
Residential mortgages | 1-4 family |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 2,865,052 | 2,556,668
Residential mortgages | 1-4 family | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 2,268,445 | 2,317,716
Residential mortgages | 1-4 family | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 596,607 | 238,952
Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 1,066,804 | 1,096,562
Consumer | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 885,526 | 937,197
Consumer | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 181,278 | 159,365
Consumer | Home equity |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 403,830 | 376,680
Consumer | Home equity | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 281,254 | 289,961
Consumer | Home equity | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 122,576 | 86,719
Consumer | Auto and other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 662,974 | 719,882
Consumer | Auto and other | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | 604,272 | 647,236
Consumer | Auto and other | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans | $ 58,702 | $ 72,646

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