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LOANS AND ALLOWANCE FOR LOAN LOSSES - Summary of Impaired Loans (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Unpaid Principal Balance [Abstract] |  |
Unpaid Principal Balance, With no related allowance recorded | $ 7,897 | $ 8,356
Unpaid Principal Balance, With related allowance recorded | 13,486 | 3,000
Unpaid Principal Balance | 21,383 | 11,356
Recorded Investment [Abstract] |  |
Recorded Investment, With no related allowance recorded | 7,897 | 8,356
Recorded Investment, With related allowance recorded | 13,486 | 3,000
Recorded Investment, With related allowance recorded | 21,383 | 11,356
Related Allowance [Abstract] |  |
Related Allowance | 1,268 | 493
Average Recorded Investment [Abstract] |  |
Average Recorded Investment, With no related allowance recorded | 5,692 | 8,202
Average Recorded Investment, With related allowance recorded | 6,128 | 1,348
Average Recorded Investment, With related allowance recorded | 11,820 | 9,550
Commercial and industrial |  |
Unpaid Principal Balance [Abstract] |  |
Unpaid Principal Balance, With no related allowance recorded | 302 | 837
Unpaid Principal Balance, With related allowance recorded |  | 185
Recorded Investment [Abstract] |  |
Recorded Investment, With no related allowance recorded | 302 | 837
Recorded Investment, With related allowance recorded |  | 185
Related Allowance [Abstract] |  |
Related Allowance |  | 64
Average Recorded Investment [Abstract] |  |
Average Recorded Investment, With no related allowance recorded | 239 | 842
Average Recorded Investment, With related allowance recorded | 61 | 300
Construction and development |  |
Unpaid Principal Balance [Abstract] |  |
Unpaid Principal Balance, With no related allowance recorded | 1,325 | 720
Unpaid Principal Balance, With related allowance recorded |  | 530
Recorded Investment [Abstract] |  |
Recorded Investment, With no related allowance recorded | 1,325 | 720
Recorded Investment, With related allowance recorded |  | 530
Related Allowance [Abstract] |  |
Related Allowance |  | 4
Average Recorded Investment [Abstract] |  |
Average Recorded Investment, With no related allowance recorded | 938 | 518
Average Recorded Investment, With related allowance recorded |  | 44
Commercial real estate |  |
Unpaid Principal Balance [Abstract] |  |
Unpaid Principal Balance, With no related allowance recorded | 3,923 | 5,168
Unpaid Principal Balance, With related allowance recorded | 13,299 | 1,985
Recorded Investment [Abstract] |  |
Recorded Investment, With no related allowance recorded | 3,923 | 5,168
Recorded Investment, With related allowance recorded | 13,299 | 1,985
Related Allowance [Abstract] |  |
Related Allowance | 1,186 | 341
Average Recorded Investment [Abstract] |  |
Average Recorded Investment, With no related allowance recorded | 3,115 | 5,138
Average Recorded Investment, With related allowance recorded | 5,892 | 677
Farmland |  |
Unpaid Principal Balance [Abstract] |  |
Unpaid Principal Balance, With related allowance recorded | 133 | 140
Recorded Investment [Abstract] |  |
Recorded Investment, With related allowance recorded | 133 | 140
Related Allowance [Abstract] |  |
Related Allowance | 62 | 78
Average Recorded Investment [Abstract] |  |
Average Recorded Investment, With no related allowance recorded |  | 62
Average Recorded Investment, With related allowance recorded | 102 | 147
1-4 family residential |  |
Unpaid Principal Balance [Abstract] |  |
Unpaid Principal Balance, With no related allowance recorded | 2,283 | 1,223
Unpaid Principal Balance, With related allowance recorded | 54 | 160
Recorded Investment [Abstract] |  |
Recorded Investment, With no related allowance recorded | 2,283 | 1,223
Recorded Investment, With related allowance recorded | 54 | 160
Related Allowance [Abstract] |  |
Related Allowance | 20 | 6
Average Recorded Investment [Abstract] |  |
Average Recorded Investment, With no related allowance recorded | 1,225 | 1,132
Average Recorded Investment, With related allowance recorded | 73 | 128
Multi-family residential |  |
Average Recorded Investment [Abstract] |  |
Average Recorded Investment, With no related allowance recorded |  | 54
Agricultural |  |
Unpaid Principal Balance [Abstract] |  |
Unpaid Principal Balance, With no related allowance recorded | 64 | 408
Recorded Investment [Abstract] |  |
Recorded Investment, With no related allowance recorded | 64 | 408
Average Recorded Investment [Abstract] |  |
Average Recorded Investment, With no related allowance recorded | $ 175 | 456
Average Recorded Investment, With related allowance recorded |  | $ 52

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