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LOANS AND ALLOWANCE FOR LOAN LOSSES - Impaired Loans (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Unpaid Principal Balance [Abstract]      
Unpaid principal balance, total $ 15,143   $ 15,712
Recorded Investment [Abstract]      
Recorded investment, total 15,097   15,665
Allowance for loan losses allocated 7,909   8,097
Average Recorded Investment [Abstract]      
Average recorded investment, total 15,381 $ 10,353  
Interest Income, Accrual Method [Abstract]      
Interest income, accrual method, total 9 11  
Commercial Mortgages | Construction      
Unpaid Principal Balance [Abstract]      
With no related allowance, unpaid principal balance 231   247
Recorded Investment [Abstract]      
With no related allowance, recorded investment 232   247
Average Recorded Investment [Abstract]      
With no related allowance, average recorded investment 239 301  
Interest Income, Accrual Method [Abstract]      
With no related allowance, interest income, accrual method 2 2  
Commercial Mortgages | Commercial mortgages, other      
Unpaid Principal Balance [Abstract]      
With no related allowance, unpaid principal balance 3,219   3,501
With related allowance, Unpaid Principal Balance 5,025   5,093
Recorded Investment [Abstract]      
With no related allowance, recorded investment 3,220   3,503
With related allowance, recorded investment 5,026   5,094
Allowance for loan losses allocated 2,058   2,097
Average Recorded Investment [Abstract]      
With no related allowance, average recorded investment 3,362 3,889  
With related allowance, average recorded investment 5,060 3,523  
Interest Income, Accrual Method [Abstract]      
With no related allowance, interest income, accrual method 0 5  
With related allowance, interest income, accrual method 0 0  
Residential mortgages      
Unpaid Principal Balance [Abstract]      
With no related allowance, unpaid principal balance 547   554
Recorded Investment [Abstract]      
With no related allowance, recorded investment 518   525
Average Recorded Investment [Abstract]      
With no related allowance, average recorded investment 521 397  
Interest Income, Accrual Method [Abstract]      
With no related allowance, interest income, accrual method 5 2  
Consumer Loans | Home equity lines and loans      
Unpaid Principal Balance [Abstract]      
With no related allowance, unpaid principal balance 171   171
Recorded Investment [Abstract]      
With no related allowance, recorded investment 149   149
Average Recorded Investment [Abstract]      
With no related allowance, average recorded investment 149 111  
Interest Income, Accrual Method [Abstract]      
With no related allowance, interest income, accrual method 2 1  
Commercial and industrial | Commercial and agricultural      
Unpaid Principal Balance [Abstract]      
With no related allowance, unpaid principal balance 105   133
With related allowance, Unpaid Principal Balance 5,845   6,013
Recorded Investment [Abstract]      
With no related allowance, recorded investment 106   133
With related allowance, recorded investment 5,846   6,014
Allowance for loan losses allocated 5,851   $ 6,000
Average Recorded Investment [Abstract]      
With no related allowance, average recorded investment 120 325  
With related allowance, average recorded investment 5,930 1,807  
Interest Income, Accrual Method [Abstract]      
With no related allowance, interest income, accrual method 0 1  
With related allowance, interest income, accrual method $ 0 $ 0