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LOANS - Summary of Total Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | $ 2,577,306 | $ 2,490,227
Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 1,828,136 | 1,630,897
Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 749,170 | 859,330
Total commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 923,773 | 826,699
Total commercial real estate | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 701,687 | 579,734
Total commercial real estate | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 222,086 | 246,965
Total commercial real estate | Construction and land development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 30,866 | 26,644
Total commercial real estate | Construction and land development | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 28,802 | 23,754
Total commercial real estate | Construction and land development | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 2,064 | 2,890
Total commercial real estate | Other commercial real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 892,907 | 800,055
Total commercial real estate | Other commercial real estate | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 672,885 | 555,980
Total commercial real estate | Other commercial real estate | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 220,022 | 244,075
Total commercial and industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 402,706 | 404,870
Total commercial and industrial | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 327,143 | 313,662
Total commercial and industrial | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 75,563 | 91,208
Total commercial and industrial | Commercial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 280,384 | 287,227
Total commercial and industrial | Commercial | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 239,894 | 234,757
Total commercial and industrial | Commercial | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 40,490 | 52,470
Total commercial and industrial | Agricultural |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 21,206 | 22,317
Total commercial and industrial | Agricultural | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 21,206 | 22,317
Total commercial and industrial | Agricultural | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 0 | 0
Total commercial and industrial | Tax exempt |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 101,116 | 95,326
Total commercial and industrial | Tax exempt | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 66,043 | 56,588
Total commercial and industrial | Tax exempt | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 35,073 | 38,738
Total commercial loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 1,326,479 | 1,231,569
Total commercial loans | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 1,028,830 | 893,396
Total commercial loans | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 297,649 | 338,173
Total residential real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 1,143,452 | 1,144,698
Total residential real estate | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 730,516 | 670,189
Total residential real estate | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 412,936 | 474,509
Total residential real estate | Residential mortgages |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 1,143,452 | 1,144,698
Total residential real estate | Residential mortgages | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 730,516 | 670,189
Total residential real estate | Residential mortgages | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 412,936 | 474,509
Total consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 107,375 | 113,960
Total consumer | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 68,790 | 67,312
Total consumer | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 38,585 | 46,648
Total consumer | Home equity |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 96,156 | 103,189
Total consumer | Home equity | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 58,556 | 57,898
Total consumer | Home equity | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 37,600 | 45,291
Total consumer | Other consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 11,219 | 10,771
Total consumer | Other consumer | Business Activities Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | 10,234 | 9,414
Total consumer | Other consumer | Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total loans | $ 985 | $ 1,357

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