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LOANS - Summary of Total Loans (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Net deferred loan costs and fees | $ (199) | $ (170)
Total loans | 2,372,436 | 1,129,064
Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 1,202,828 | 1,129,234
Net deferred loan costs and fees | (199) | (170)
Total loans | 1,202,629 | 1,129,064
Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 1,169,807 |
Net deferred loan costs and fees | 0 | 0
Total loans | 1,169,807 | 0
Commercial Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 779,834 | 418,289
Commercial Real Estate | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 444,937 | 418,289
Total loans | 444,937 | 418,289
Commercial Real Estate | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 334,897 | 0
Total loans | 334,897 | 0
Commercial Real Estate | Construction and land development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 25,630 | 14,695
Commercial Real Estate | Construction and land development | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 8,315 | 14,695
Total loans | 8,315 | 14,695
Commercial Real Estate | Construction and land development | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 17,315 | 0
Total loans | 17,315 | 0
Commercial Real Estate | Commercial real estate other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 754,204 | 403,594
Commercial Real Estate | Commercial real estate other | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 436,622 | 403,594
Total loans | 436,622 | 403,594
Commercial Real Estate | Commercial real estate other | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 317,582 | 0
Total loans | 317,582 | 0
Commercial and Industrial Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 309,995 | 151,240
Commercial and Industrial Loans | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 184,186 | 151,240
Total loans | 184,186 | 151,240
Commercial and Industrial Loans | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 125,809 | 0
Total loans | 125,809 | 0
Commercial and Industrial Loans | Commercial other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 203,063 | 103,586
Commercial and Industrial Loans | Commercial other | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 120,302 | 103,586
Total loans | 120,302 | 103,586
Commercial and Industrial Loans | Commercial other | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 82,761 | 0
Total loans | 82,761 | 0
Commercial and Industrial Loans | Agricultural and other loans to farmers |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 33,264 | 31,808
Commercial and Industrial Loans | Agricultural and other loans to farmers | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 32,621 | 31,808
Total loans | 32,621 | 31,808
Commercial and Industrial Loans | Agricultural and other loans to farmers | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 643 | 0
Total loans | 643 | 0
Commercial and Industrial Loans | Tax exempt loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 73,668 | 15,846
Commercial and Industrial Loans | Tax exempt loans | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 31,263 | 15,846
Total loans | 31,263 | 15,846
Commercial and Industrial Loans | Tax exempt loans | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 42,405 | 0
Total loans | 42,405 | 0
Commercial Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 1,089,829 | 569,529
Commercial Loans | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 629,123 | 569,529
Total loans | 629,123 | 569,529
Commercial Loans | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 460,706 | 0
Total loans | 460,706 |
Residential Mortgages |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 1,155,436 | 506,612
Residential Mortgages | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 518,556 | 506,612
Total loans | 518,556 | 506,612
Residential Mortgages | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 636,880 | 0
Total loans | 636,880 |
Residential Mortgages | Residential real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 1,155,436 | 506,612
Residential Mortgages | Residential real estate | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 518,556 | 506,612
Total loans | 518,556 | 506,612
Residential Mortgages | Residential real estate | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 636,880 | 0
Total loans | 636,880 |
Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 127,370 | 53,093
Consumer | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 55,149 | 53,093
Total loans | 55,149 | 53,093
Consumer | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 72,221 | 0
Total loans | 72,221 |
Consumer | Home equity |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 116,392 | 46,921
Consumer | Home equity | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 48,018 | 46,921
Total loans | 48,018 | 46,921
Consumer | Home equity | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 68,374 | 0
Total loans | 68,374 |
Consumer | Consumer other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 10,978 | 6,172
Consumer | Consumer other | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 7,131 | 6,172
Total loans | 7,131 | 6,172
Consumer | Consumer other | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 3,847 | $ 0
Total loans | $ 3,847 |

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