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LOANS AND ALLOWANCE FOR LOAN LOSSES - Impaired Loans (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Unpaid Principal Balance [Abstract]          
Unpaid principal balance, total $ 12,194   $ 12,194   $ 12,852
Recorded Investment [Abstract]          
Recorded investment, total 11,092   11,092   11,926
Allowance for loan losses allocated 1,168   1,168   876
Average Recorded Investment [Abstract]          
Average recorded investment, total 12,100 $ 13,434 12,391 $ 14,023  
Interest Income, Accrual Method [Abstract]          
Interest income, accrual method, total 26 79 128 240  
Commercial Mortgages | Construction          
Unpaid Principal Balance [Abstract]          
With no related allowance, Unpaid Principal Balance 395   395   277
Recorded Investment [Abstract]          
With no related allowance, Recorded Investment 396   396   278
Average Recorded Investment [Abstract]          
With no related allowance, Average Recorded Investment 974 310 946 329  
Interest Income, Accrual Method [Abstract]          
With no related allowance, Interest Income, Accrual Method 3 4 9 11  
Commercial Mortgages | Commercial mortgages, other          
Unpaid Principal Balance [Abstract]          
With no related allowance, Unpaid Principal Balance 4,274   4,274   8,792
With related allowance, Unpaid Principal Balance 5,875   5,875   2,245
Recorded Investment [Abstract]          
With no related allowance, Recorded Investment 4,277   4,277   7,857
With related allowance, Recorded Investment 4,785   4,785   2,247
Allowance for loan losses allocated 1,009   1,009   735
Average Recorded Investment [Abstract]          
With no related allowance, Average Recorded Investment 4,946 6,124 5,973 6,760  
With related allowance, Average Recorded Investment 4,721 5,151 3,989 4,998  
Interest Income, Accrual Method [Abstract]          
With no related allowance, Interest Income, Accrual Method 5 60 73 181  
With related allowance, Interest Income, Accrual Method 4 1 10 4  
Residential mortgages          
Unpaid Principal Balance [Abstract]          
With no related allowance, Unpaid Principal Balance 457   457   395
Recorded Investment [Abstract]          
With no related allowance, Recorded Investment 434   434   396
Average Recorded Investment [Abstract]          
With no related allowance, Average Recorded Investment 439 443 416 358  
Interest Income, Accrual Method [Abstract]          
With no related allowance, Interest Income, Accrual Method 2 2 6 3  
Consumer loans: | Home equity lines and loans          
Unpaid Principal Balance [Abstract]          
With no related allowance, Unpaid Principal Balance 66   66   93
With related allowance, Unpaid Principal Balance 0   0   360
Recorded Investment [Abstract]          
With no related allowance, Recorded Investment 67   67   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 68 101 76 104  
With related allowance, Average Recorded Investment 0 360 180 362  
Interest Income, Accrual Method [Abstract]          
With no related allowance, Interest Income, Accrual Method 1 1 2 4  
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 714   714   690
With related allowance, Unpaid Principal Balance 413   413   0
Recorded Investment [Abstract]          
With no related allowance, Recorded Investment 719   719   693
With related allowance, Recorded Investment 414   414   0
Allowance for loan losses allocated 159   159   $ 0
Average Recorded Investment [Abstract]          
With no related allowance, Average Recorded Investment 661 900 666 1,083  
With related allowance, Average Recorded Investment 291 45 145 29  
Interest Income, Accrual Method [Abstract]          
With no related allowance, Interest Income, Accrual Method 8 10 24 33  
With related allowance, Interest Income, Accrual Method $ 3 $ 1 $ 4 $ 4