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LOANS AND ALLOWANCE FOR LOAN LOSSES - Summary of Impaired Loans (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Unpaid Principal Balance [Abstract] |  |
Unpaid Principal Balance, With no related allowance recorded | $ 5,717 | $ 5,062
Unpaid Principal Balance, With related allowance recorded | 623 | 1,256
Unpaid Principal Balance | 6,340 | 6,318
Recorded Investment [Abstract] |  |
Recorded Investment, With no related allowance recorded | 5,717 | 5,062
Recorded Investment, With related allowance recorded | 623 | 1,256
Recorded Investment | 6,340 | 6,318
Related Allowance [Abstract] |  |
Related Allowance | 134 | 253
Average Recorded Investment [Abstract] |  |
Average Recorded Investment, With no related allowance recorded | 6,786 | 3,695
Average Recorded Investment, With related allowance recorded | 1,953 | 4,118
Average Recorded Investment | 8,739 | 7,813
Commercial and industrial |  |
Unpaid Principal Balance [Abstract] |  |
Unpaid Principal Balance, With no related allowance recorded | 437 | 28
Unpaid Principal Balance, With related allowance recorded | 26 | 203
Recorded Investment [Abstract] |  |
Recorded Investment, With no related allowance recorded | 437 | 28
Recorded Investment, With related allowance recorded | 26 | 203
Related Allowance [Abstract] |  |
Related Allowance | 17 | 64
Average Recorded Investment [Abstract] |  |
Average Recorded Investment, With no related allowance recorded | 434 | 809
Average Recorded Investment, With related allowance recorded | 315 | 3,153
Construction and development |  |
Unpaid Principal Balance [Abstract] |  |
Unpaid Principal Balance, With no related allowance recorded | 0 | 1,825
Unpaid Principal Balance, With related allowance recorded | 0 | 0
Recorded Investment [Abstract] |  |
Recorded Investment, With no related allowance recorded | 0 | 1,825
Recorded Investment, With related allowance recorded | 0 | 0
Related Allowance [Abstract] |  |
Related Allowance | 0 | 0
Average Recorded Investment [Abstract] |  |
Average Recorded Investment, With no related allowance recorded | 311 | 172
Average Recorded Investment, With related allowance recorded | 7 | 0
Commercial real estate |  |
Unpaid Principal Balance [Abstract] |  |
Unpaid Principal Balance, With no related allowance recorded | 3,979 | 1,196
Unpaid Principal Balance, With related allowance recorded | 279 | 0
Recorded Investment [Abstract] |  |
Recorded Investment, With no related allowance recorded | 3,979 | 1,196
Recorded Investment, With related allowance recorded | 279 | 0
Related Allowance [Abstract] |  |
Related Allowance | 27 | 0
Average Recorded Investment [Abstract] |  |
Average Recorded Investment, With no related allowance recorded | 4,230 | 871
Average Recorded Investment, With related allowance recorded | 505 | 0
Farmland |  |
Unpaid Principal Balance [Abstract] |  |
Unpaid Principal Balance, With no related allowance recorded | 6 | 89
Unpaid Principal Balance, With related allowance recorded | 157 | 169
Recorded Investment [Abstract] |  |
Recorded Investment, With no related allowance recorded | 6 | 89
Recorded Investment, With related allowance recorded | 157 | 169
Related Allowance [Abstract] |  |
Related Allowance | 85 | 47
Average Recorded Investment [Abstract] |  |
Average Recorded Investment, With no related allowance recorded | 90 | 109
Average Recorded Investment, With related allowance recorded | 131 | 169
1-4 family residential |  |
Unpaid Principal Balance [Abstract] |  |
Unpaid Principal Balance, With no related allowance recorded | 681 | 1,799
Unpaid Principal Balance, With related allowance recorded | 161 | 789
Recorded Investment [Abstract] |  |
Recorded Investment, With no related allowance recorded | 681 | 1,799
Recorded Investment, With related allowance recorded | 161 | 789
Related Allowance [Abstract] |  |
Related Allowance | 5 | 108
Average Recorded Investment [Abstract] |  |
Average Recorded Investment, With no related allowance recorded | 1,096 | 1,575
Average Recorded Investment, With related allowance recorded | 754 | 639
Multi-family residential |  |
Unpaid Principal Balance [Abstract] |  |
Unpaid Principal Balance, With no related allowance recorded | 217 | 5
Unpaid Principal Balance, With related allowance recorded | 0 | 0
Recorded Investment [Abstract] |  |
Recorded Investment, With no related allowance recorded | 217 | 5
Recorded Investment, With related allowance recorded | 0 | 0
Related Allowance [Abstract] |  |
Related Allowance | 0 | 0
Average Recorded Investment [Abstract] |  |
Average Recorded Investment, With no related allowance recorded | 180 | 2
Average Recorded Investment, With related allowance recorded | 19 | 0
Consumer |  |
Unpaid Principal Balance [Abstract] |  |
Unpaid Principal Balance, With no related allowance recorded | 0 | 105
Unpaid Principal Balance, With related allowance recorded | 0 | 95
Recorded Investment [Abstract] |  |
Recorded Investment, With no related allowance recorded | 0 | 105
Recorded Investment, With related allowance recorded | 0 | 95
Related Allowance [Abstract] |  |
Related Allowance | 0 | 34
Average Recorded Investment [Abstract] |  |
Average Recorded Investment, With no related allowance recorded | 61 | 89
Average Recorded Investment, With related allowance recorded | 42 | 155
Agricultural |  |
Unpaid Principal Balance [Abstract] |  |
Unpaid Principal Balance, With no related allowance recorded | 397 | 15
Unpaid Principal Balance, With related allowance recorded | 0 | 0
Recorded Investment [Abstract] |  |
Recorded Investment, With no related allowance recorded | 397 | 15
Recorded Investment, With related allowance recorded | 0 | 0
Related Allowance [Abstract] |  |
Related Allowance | 0 | 0
Average Recorded Investment [Abstract] |  |
Average Recorded Investment, With no related allowance recorded | 384 | 68
Average Recorded Investment, With related allowance recorded | $ 180 | $ 2

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