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LOANS AND ALLOWANCE FOR LOAN LOSSES - Impaired Loans (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Unpaid Principal Balance [Abstract]          
Unpaid principal balance, total $ 14,091   $ 14,091   $ 12,852
Recorded Investment [Abstract]          
Recorded investment, total 13,108   13,108   11,926
Allowance for loan losses allocated 970   970   876
Average Recorded Investment [Abstract]          
Average recorded investment, total 13,273 $ 13,932 12,825 $ 14,280  
Interest Income, Accrual Method [Abstract]          
Interest income, accrual method, total 51 77 126 160  
Commercial Mortgages | Construction          
Unpaid Principal Balance [Abstract]          
With no related allowance, Unpaid Principal Balance 1,550   1,550   277
Recorded Investment [Abstract]          
With no related allowance, Recorded Investment 1,551   1,551   278
Average Recorded Investment [Abstract]          
With no related allowance, Average Recorded Investment 1,555 340 1,130 343  
Interest Income, Accrual Method [Abstract]          
With no related allowance, Interest Income, Accrual Method 3 3 6 7  
Commercial Mortgages | Commercial mortgages, other          
Unpaid Principal Balance [Abstract]          
With no related allowance, Unpaid Principal Balance 5,641   5,641   8,792
With related allowance, Unpaid Principal Balance 5,595   5,595   2,245
Recorded Investment [Abstract]          
With no related allowance, Recorded Investment 5,615   5,615   7,857
With related allowance, Recorded Investment 4,657   4,657   2,247
Allowance for loan losses allocated 886   886   735
Average Recorded Investment [Abstract]          
With no related allowance, Average Recorded Investment 5,879 6,733 6,538 7,014  
With related allowance, Average Recorded Investment 4,461 4,942 3,723 4,910  
Interest Income, Accrual Method [Abstract]          
With no related allowance, Interest Income, Accrual Method 32 59 90 121  
With related allowance, Interest Income, Accrual Method 4 1 7 3  
Residential mortgages          
Unpaid Principal Balance [Abstract]          
With no related allowance, Unpaid Principal Balance 466   466   395
Recorded Investment [Abstract]          
With no related allowance, Recorded Investment 443   443   396
Average Recorded Investment [Abstract]          
With no related allowance, Average Recorded Investment 417 399 410 344  
Interest Income, Accrual Method [Abstract]          
With no related allowance, Interest Income, Accrual Method 2 1 4 1  
Consumer loans: | Home equity lines and loans          
Unpaid Principal Balance [Abstract]          
With no related allowance, Unpaid Principal Balance 69   69   93
With related allowance, Unpaid Principal Balance 0   0   360
Recorded Investment [Abstract]          
With no related allowance, Recorded Investment 70   70   95
With related allowance, Recorded Investment 0   0   360
Allowance for loan losses allocated 0   0   141
Average Recorded Investment [Abstract]          
With no related allowance, Average Recorded Investment 71 104 79 105  
With related allowance, Average Recorded Investment 180 362 240 363  
Interest Income, Accrual Method [Abstract]          
With no related allowance, Interest Income, Accrual Method 1 1 1 3  
With related allowance, Interest Income, Accrual Method 0 0 0 0  
Commercial and industrial | Commercial and agricultural:          
Unpaid Principal Balance [Abstract]          
With no related allowance, Unpaid Principal Balance 602   602   690
With related allowance, Unpaid Principal Balance 168   168   0
Recorded Investment [Abstract]          
With no related allowance, Recorded Investment 604   604   693
With related allowance, Recorded Investment 168   168   0
Allowance for loan losses allocated 84   84   $ 0
Average Recorded Investment [Abstract]          
With no related allowance, Average Recorded Investment 626 1,048 649 1,195  
With related allowance, Average Recorded Investment 84 4 56 6  
Interest Income, Accrual Method [Abstract]          
With no related allowance, Interest Income, Accrual Method 8 12 17 25  
With related allowance, Interest Income, Accrual Method $ 1 $ 0 $ 1 $ 0