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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, 2017
Sep. 30, 2016
Dec. 31, 2016
Unpaid Principal Balance [Abstract]      
Unpaid Principal Balance, With no related allowance recorded $ 5,047   $ 5,062
Unpaid Principal Balance, With related allowance recorded 1,633   1,256
Unpaid Principal Balance 6,680   6,318
Recorded Investment [Abstract]      
Recorded Investment, With no related allowance recorded 5,047   5,062
Recorded Investment, With related allowance recorded 1,633   1,256
Recorded Investment 6,680   6,318
Related Allowance [Abstract]      
Related Allowance 520   253
Average Recorded Investment [Abstract]      
Average Recorded Investment, With no related allowance recorded 7,180   3,695
Average Recorded Investment, With related allowance recorded 2,248   4,118
Average Recorded Investment 9,428   7,813
Interest income 0 $ 0  
Cash-based interest income 0 $ 0  
Commercial and industrial      
Unpaid Principal Balance [Abstract]      
Unpaid Principal Balance, With no related allowance recorded 325   28
Unpaid Principal Balance, With related allowance recorded 29   203
Recorded Investment [Abstract]      
Recorded Investment, With no related allowance recorded 325   28
Recorded Investment, With related allowance recorded 29   203
Related Allowance [Abstract]      
Related Allowance 19   64
Average Recorded Investment [Abstract]      
Average Recorded Investment, With no related allowance recorded 381   809
Average Recorded Investment, With related allowance recorded 411   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    
Recorded Investment [Abstract]      
Recorded Investment, With no related allowance recorded 0   1,825
Recorded Investment, With related allowance recorded 0    
Related Allowance [Abstract]      
Related Allowance 0    
Average Recorded Investment [Abstract]      
Average Recorded Investment, With no related allowance recorded 415   172
Average Recorded Investment, With related allowance recorded 10    
Commercial real estate      
Unpaid Principal Balance [Abstract]      
Unpaid Principal Balance, With no related allowance recorded 3,746   1,196
Unpaid Principal Balance, With related allowance recorded 283    
Recorded Investment [Abstract]      
Recorded Investment, With no related allowance recorded 3,746   1,196
Recorded Investment, With related allowance recorded 283    
Related Allowance [Abstract]      
Related Allowance 31    
Average Recorded Investment [Abstract]      
Average Recorded Investment, With no related allowance recorded 4,363   871
Average Recorded Investment, With related allowance recorded 580    
Farmland      
Unpaid Principal Balance [Abstract]      
Unpaid Principal Balance, With no related allowance recorded 120   89
Unpaid Principal Balance, With related allowance recorded 156   169
Recorded Investment [Abstract]      
Recorded Investment, With no related allowance recorded 120   89
Recorded Investment, With related allowance recorded 156   169
Related Allowance [Abstract]      
Related Allowance 85   47
Average Recorded Investment [Abstract]      
Average Recorded Investment, With no related allowance recorded 106   109
Average Recorded Investment, With related allowance recorded 122   169
1-4 family residential      
Unpaid Principal Balance [Abstract]      
Unpaid Principal Balance, With no related allowance recorded 231   1,799
Unpaid Principal Balance, With related allowance recorded 866   789
Recorded Investment [Abstract]      
Recorded Investment, With no related allowance recorded 231   1,799
Recorded Investment, With related allowance recorded 866   789
Related Allowance [Abstract]      
Related Allowance 145   108
Average Recorded Investment [Abstract]      
Average Recorded Investment, With no related allowance recorded 1,288   1,575
Average Recorded Investment, With related allowance recorded 867   639
Multi-family residential      
Unpaid Principal Balance [Abstract]      
Unpaid Principal Balance, With no related allowance recorded 228   5
Unpaid Principal Balance, With related allowance recorded 0    
Recorded Investment [Abstract]      
Recorded Investment, With no related allowance recorded 228   5
Recorded Investment, With related allowance recorded 0    
Related Allowance [Abstract]      
Related Allowance 0    
Average Recorded Investment [Abstract]      
Average Recorded Investment, With no related allowance recorded 166   2
Average Recorded Investment, With related allowance recorded 26    
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 81   89
Average Recorded Investment, With related allowance recorded 56   155
Agricultural      
Unpaid Principal Balance [Abstract]      
Unpaid Principal Balance, With no related allowance recorded 397   15
Unpaid Principal Balance, With related allowance recorded 299   0
Recorded Investment [Abstract]      
Recorded Investment, With no related allowance recorded 397   15
Recorded Investment, With related allowance recorded 299   0
Related Allowance [Abstract]      
Related Allowance 240   0
Average Recorded Investment [Abstract]      
Average Recorded Investment, With no related allowance recorded 380   68
Average Recorded Investment, With related allowance recorded $ 176   $ 2