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LOANS AND ALLOWANCE FOR LOAN LOSSES - Allowances (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018 | Sep. 30, 2019 | Dec. 31, 2018
Allowance for loan losses, by portfolio segment [Roll Forward] |  |  |  |  |  |  |
Beginning balance | $ 19,656 | $ 19,645 | $ 18,944 | $ 21,161 | $ 21,161 |  |
Charge-offs | (302) | (440) | (1,155) | (5,315) |  |  |
Recoveries | 128 | 130 | 450 | 418 |  |  |
Net recoveries (charge-offs) | (174) | (310) | (705) | (4,897) |  |  |
Provision | 4,441 | 300 | 5,684 | 3,371 |  |  |
Ending balance | 23,923 | 19,635 | 23,923 | 19,635 | 18,944 |  |
Ending allowance balance attributable to loans [Abstract] |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  |  | $ 8,660 | $ 2,189
Collectively evaluated for impairment |  |  |  |  |  | 15,263 | 16,755
Total ending allowance balance | 19,656 | 19,645 | 18,944 | 21,161 | 21,161 | 23,923 | 18,944
Loans [Abstract] |  |  |  |  |  |  |
Loans individually evaluated for impairment |  |  |  |  |  | 20,617 | 8,731
Loans collectively evaluated for impairment |  |  |  |  |  | 1,289,703 | 1,306,878
Total recorded investment in loans |  |  |  |  |  | 1,310,320 | 1,315,609
Commercial and Agricultural |  |  |  |  |  |  |
Allowance for loan losses, by portfolio segment [Roll Forward] |  |  |  |  |  |  |
Beginning balance | 5,476 | 4,969 | 5,383 | 6,976 | 6,976 |  |
Charge-offs | 0 |  | (55) | (3,644) |  |  |
Recoveries | 29 | 13 | 44 | 34 |  |  |
Net recoveries (charge-offs) | 29 | 13 | (11) | (3,610) |  |  |
Provision | 4,651 | 285 | 4,784 | 1,901 |  |  |
Ending balance | 10,156 | 5,267 | 10,156 | 5,267 | 5,383 |  |
Ending allowance balance attributable to loans [Abstract] |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  |  | 6,141 | 1,743
Collectively evaluated for impairment |  |  |  |  |  | 4,015 | 3,640
Total ending allowance balance | 5,476 | 4,969 | 5,383 | 6,976 | 6,976 | 10,156 | 5,383
Loans [Abstract] |  |  |  |  |  |  |
Loans individually evaluated for impairment |  |  |  |  |  | 6,349 | 2,128
Loans collectively evaluated for impairment |  |  |  |  |  | 221,376 | 201,284
Total recorded investment in loans |  |  |  |  |  | 227,725 | 203,412
Commercial Mortgages |  |  |  |  |  |  |
Allowance for loan losses, by portfolio segment [Roll Forward] |  |  |  |  |  |  |
Beginning balance | 9,545 | 8,740 | 8,184 | 8,514 | 8,514 |  |
Charge-offs | 0 | 0 | 0 | (145) |  |  |
Recoveries | 0 | 0 | 2 | 2 |  |  |
Net recoveries (charge-offs) | 0 | 0 | 2 | (143) |  |  |
Provision | (285) | (91) | 1,074 | 278 |  |  |
Ending balance | 9,260 | 8,649 | 9,260 | 8,649 | 8,184 |  |
Ending allowance balance attributable to loans [Abstract] |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  |  | 2,519 | 446
Collectively evaluated for impairment |  |  |  |  |  | 6,741 | 7,738
Total ending allowance balance | 9,545 | 8,740 | 8,184 | 8,514 | 8,514 | 9,260 | 8,184
Loans [Abstract] |  |  |  |  |  |  |
Loans individually evaluated for impairment |  |  |  |  |  | 13,708 | 6,146
Loans collectively evaluated for impairment |  |  |  |  |  | 639,697 | 656,842
Total recorded investment in loans |  |  |  |  |  | 653,405 | 662,988
Residential mortgages |  |  |  |  |  |  |
Allowance for loan losses, by portfolio segment [Roll Forward] |  |  |  |  |  |  |
Beginning balance | 1,229 | 1,445 | 1,226 | 1,316 | 1,316 |  |
Charge-offs | (19) | (60) | (60) | (225) |  |  |
Recoveries | 0 | 0 | 45 | 5 |  |  |
Net recoveries (charge-offs) | (19) | (60) | (15) | (220) |  |  |
Provision | (26) | 11 | (27) | 300 |  |  |
Ending balance | 1,184 | 1,396 | 1,184 | 1,396 | 1,226 |  |
Ending allowance balance attributable to loans [Abstract] |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  |  | 0 | 0
Collectively evaluated for impairment |  |  |  |  |  | 1,184 | 1,226
Total ending allowance balance | 1,229 | 1,445 | 1,226 | 1,316 | 1,316 | 1,184 | 1,226
Loans [Abstract] |  |  |  |  |  |  |
Loans individually evaluated for impairment |  |  |  |  |  | 407 | 402
Loans collectively evaluated for impairment |  |  |  |  |  | 184,162 | 182,823
Total recorded investment in loans |  |  |  |  |  | 184,569 | 183,225
Consumer Loans |  |  |  |  |  |  |
Allowance for loan losses, by portfolio segment [Roll Forward] |  |  |  |  |  |  |
Beginning balance | 3,406 | 4,491 | 4,151 | 4,355 | 4,355 |  |
Charge-offs | (283) | (380) | (1,040) | (1,301) |  |  |
Recoveries | 99 | 117 | 359 | 377 |  |  |
Net recoveries (charge-offs) | (184) | (263) | (681) | (924) |  |  |
Provision | 101 | 95 | (147) | 892 |  |  |
Ending balance | 3,323 | 4,323 | 3,323 | 4,323 | 4,151 |  |
Ending allowance balance attributable to loans [Abstract] |  |  |  |  |  |  |
Individually evaluated for impairment |  |  |  |  |  | 0 | 0
Collectively evaluated for impairment |  |  |  |  |  | 3,323 | 4,151
Total ending allowance balance | $ 3,406 | $ 4,491 | $ 4,151 | $ 4,355 | $ 4,355 | 3,323 | 4,151
Loans [Abstract] |  |  |  |  |  |  |
Loans individually evaluated for impairment |  |  |  |  |  | 153 | 55
Loans collectively evaluated for impairment |  |  |  |  |  | 244,468 | 265,929
Total recorded investment in loans |  |  |  |  |  | $ 244,621 | $ 265,984

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