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LOANS - Summary of Total Loans (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | $ 2,376,647 | $ 1,129,064
Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 1,263,938 | 1,129,064
Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 1,112,709 | 0
Commercial Real Estate: |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 738,584 | 418,119
Commercial Real Estate: | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 430,754 | 418,119
Commercial Real Estate: | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 307,830 | 0
Commercial Real Estate: | Construction and land development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 43,895 | 14,695
Commercial Real Estate: | Construction and land development | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 27,428 | 14,695
Commercial Real Estate: | Construction and land development | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 16,467 | 0
Commercial Real Estate: | Other commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 694,689 | 403,424
Commercial Real Estate: | Other commercial real estate | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 403,326 | 403,424
Commercial Real Estate: | Other commercial real estate | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 291,363 | 0
Commercial and Industrial: |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 350,002 | 151,240
Commercial and Industrial: | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 228,151 | 151,240
Commercial and Industrial: | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 121,851 | 0
Commercial and Industrial: | Other Commercial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 238,501 | 103,586
Commercial and Industrial: | Other Commercial | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 158,434 | 103,586
Commercial and Industrial: | Other Commercial | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 80,067 | 0
Commercial and Industrial: | Agricultural and other loans to farmers |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 31,459 | 31,808
Commercial and Industrial: | Agricultural and other loans to farmers | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 31,459 | 31,808
Commercial and Industrial: | Agricultural and other loans to farmers | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 0 | 0
Commercial and Industrial: | Tax exempt |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 80,042 | 15,846
Commercial and Industrial: | Tax exempt | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 38,258 | 15,846
Commercial and Industrial: | Tax exempt | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 41,784 | 0
Total Commercial Loans: |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 1,088,586 | 569,359
Total Commercial Loans: | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 658,905 | 569,359
Total Commercial Loans: | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 429,681 | 0
Residential Real Estate: |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 1,160,832 | 506,612
Residential Real Estate: | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 549,578 | 506,612
Residential Real Estate: | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 611,254 | 0
Residential Real Estate: | Residential mortgages |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 1,160,832 | 506,612
Residential Real Estate: | Residential mortgages | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 549,578 | 506,612
Residential Real Estate: | Residential mortgages | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 611,254 | 0
Consumer: |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 127,229 | 53,093
Consumer: | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 55,455 | 53,093
Consumer: | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 71,774 | 0
Consumer: | Home equity |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 116,469 | 46,921
Consumer: | Home equity | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 47,762 | 46,921
Consumer: | Home equity | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 68,707 | 0
Consumer: | Other consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 10,760 | 6,172
Consumer: | Other consumer | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 7,693 | 6,172
Consumer: | Other consumer | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | $ 3,067 | $ 0

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