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LOANS - Summary of Total Loans (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | $ 2,485,066 | $ 2,485,613
Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 1,533,325 | 1,452,630
Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 951,741 | 1,032,983
Total Commercial Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 838,546 | 826,746
Total Commercial Real Estate | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 568,302 | 534,011
Total Commercial Real Estate | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 270,244 | 292,735
Total Commercial Real Estate | Construction and land development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 37,264 | 45,673
Total Commercial Real Estate | Construction and land development | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 27,722 | 28,892
Total Commercial Real Estate | Construction and land development | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 9,542 | 16,781
Total Commercial Real Estate | Other commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 801,282 | 781,073
Total Commercial Real Estate | Other commercial real estate | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 540,580 | 505,119
Total Commercial Real Estate | Other commercial real estate | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 260,702 | 275,954
Total Commercial and Industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 400,293 | 379,423
Total Commercial and Industrial | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 296,827 | 268,004
Total Commercial and Industrial | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 103,466 | 111,419
Total Commercial and Industrial | Other Commercial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 288,396 | 266,120
Total Commercial and Industrial | Other Commercial | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 226,143 | 198,051
Total Commercial and Industrial | Other Commercial | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 62,253 | 68,069
Total Commercial and Industrial | Agricultural |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 25,284 | 27,588
Total Commercial and Industrial | Agricultural | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 25,284 | 27,588
Total Commercial and Industrial | Agricultural | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 0 | 0
Total Commercial and Industrial | Tax exempt |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 86,613 | 85,715
Total Commercial and Industrial | Tax exempt | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 45,400 | 42,365
Total Commercial and Industrial | Tax exempt | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 41,213 | 43,350
Total Commercial Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 1,238,839 | 1,206,169
Total Commercial Loans | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 865,129 | 802,015
Total Commercial Loans | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 373,710 | 404,154
Total Residential Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 1,127,895 | 1,155,682
Total Residential Real Estate | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 606,128 | 591,411
Total Residential Real Estate | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 521,767 | 564,271
Total Residential Real Estate | Residential mortgages |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 1,127,895 | 1,155,682
Total Residential Real Estate | Residential mortgages | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 606,128 | 591,411
Total Residential Real Estate | Residential mortgages | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 521,767 | 564,271
Total Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 118,332 | 123,762
Total Consumer | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 62,068 | 59,204
Total Consumer | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 56,264 | 64,558
Total Consumer | Home equity |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 108,310 | 113,593
Total Consumer | Home equity | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 53,853 | 51,376
Total Consumer | Home equity | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 54,457 | 62,217
Total Consumer | Other consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 10,022 | 10,169
Total Consumer | Other consumer | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 8,215 | 7,828
Total Consumer | Other consumer | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | $ 1,807 | $ 2,341

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