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LOANS - Summary of Total Loans (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | $ 2,641,092 | $ 2,490,227
Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 1,835,230 | 1,630,897
Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 805,862 | 859,330
Commercial real estate: |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 930,661 | 826,699
Commercial real estate: | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 697,438 | 579,734
Commercial real estate: | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 233,223 | 246,965
Commercial real estate: | Construction and land development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 34,290 | 26,644
Commercial real estate: | Construction and land development | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 31,387 | 23,754
Commercial real estate: | Construction and land development | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 2,903 | 2,890
Commercial real estate: | Other commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 896,371 | 800,055
Commercial real estate: | Other commercial real estate | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 666,051 | 555,980
Commercial real estate: | Other commercial real estate | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 230,320 | 244,075
Commercial and industrial: |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 423,291 | 404,870
Commercial and industrial: | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 326,570 | 313,662
Commercial and industrial: | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 96,721 | 91,208
Commercial and industrial: | Commercial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 298,764 | 287,227
Commercial and industrial: | Commercial | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 239,692 | 234,757
Commercial and industrial: | Commercial | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 59,072 | 52,470
Commercial and industrial: | Agricultural |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 20,224 | 22,317
Commercial and industrial: | Agricultural | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 20,018 | 22,317
Commercial and industrial: | Agricultural | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 206 | 0
Commercial and industrial: | Tax exempt |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 104,303 | 95,326
Commercial and industrial: | Tax exempt | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 66,860 | 56,588
Commercial and industrial: | Tax exempt | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 37,443 | 38,738
Total commercial loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 1,353,952 | 1,231,569
Total commercial loans | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 1,024,008 | 893,396
Total commercial loans | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 329,944 | 338,173
Residential real estate: |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 1,151,857 | 1,144,698
Residential real estate: | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 740,687 | 670,189
Residential real estate: | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 411,170 | 474,509
Residential real estate: | Residential mortgages |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 1,151,857 | 1,144,698
Residential real estate: | Residential mortgages | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 740,687 | 670,189
Residential real estate: | Residential mortgages | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 411,170 | 474,509
Consumer: |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 135,283 | 113,960
Consumer: | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 70,535 | 67,312
Consumer: | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 64,748 | 46,648
Consumer: | Home equity |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 122,401 | 103,189
Consumer: | Home equity | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 59,368 | 57,898
Consumer: | Home equity | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 63,033 | 45,291
Consumer: | Other consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 12,882 | 10,771
Consumer: | Other consumer | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | 11,167 | 9,414
Consumer: | Other consumer | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans, gross | $ 1,715 | $ 1,357

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