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LOANS AND ALLOWANCE FOR LOAN LOSSES - Impaired Loans (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Unpaid Principal Balance [Abstract]      
Unpaid principal balance, total $ 16,568   $ 16,546
Recorded Investment [Abstract]      
Recorded investment, total 9,922   10,589
Allowance for loan losses allocated 1,579   1,527
Average Recorded Investment [Abstract]      
Average recorded investment, total 10,257 $ 15,381  
Interest Income, Accrual Method [Abstract]      
Interest income, accrual method, total 35 9  
Commercial and agricultural: | Commercial and industrial      
Unpaid Principal Balance [Abstract]      
With no related allowance, unpaid principal balance 1,860   1,960
With related allowance, unpaid principal balance 5,380   5,228
Recorded Investment [Abstract]      
With no related allowance, recorded investment 1,860   1,963
With related allowance, recorded investment 1,518   1,437
Allowance for loan losses allocated 1,430   1,401
Average Recorded Investment [Abstract]      
With no related allowance, average recorded investment 1,912 120  
With related allowance, average recorded investment 1,477 5,930  
Interest Income, Accrual Method [Abstract]      
With no related allowance, interest income, accrual method 13 0  
With related allowance, interest income, accrual method 2 0  
Commercial mortgages: | Construction      
Unpaid Principal Balance [Abstract]      
With no related allowance, unpaid principal balance 175   188
Recorded Investment [Abstract]      
With no related allowance, recorded investment 176   189
Average Recorded Investment [Abstract]      
With no related allowance, average recorded investment 182 239  
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 7,542   6,814
With related allowance, unpaid principal balance 256   258
Recorded Investment [Abstract]      
With no related allowance, recorded investment 4,881   4,760
With related allowance, recorded investment 166   168
Allowance for loan losses allocated 107   74
Average Recorded Investment [Abstract]      
With no related allowance, average recorded investment 4,822 3,362  
With related allowance, average recorded investment 167 5,060  
Interest Income, Accrual Method [Abstract]      
With no related allowance, interest income, accrual method 8 0  
With related allowance, interest income, accrual method 0 0  
Residential mortgages      
Unpaid Principal Balance [Abstract]      
With no related allowance, unpaid principal balance 981   1,283
Recorded Investment [Abstract]      
With no related allowance, recorded investment 964   1,271
Average Recorded Investment [Abstract]      
With no related allowance, average recorded investment 1,118 521  
Interest Income, Accrual Method [Abstract]      
With no related allowance, interest income, accrual method 8 5  
Consumer loans: | Home equity lines and loans      
Unpaid Principal Balance [Abstract]      
With no related allowance, unpaid principal balance 213   645
With related allowance, unpaid principal balance 161   170
Recorded Investment [Abstract]      
With no related allowance, recorded investment 196   631
With related allowance, recorded investment 161   170
Allowance for loan losses allocated 42   $ 52
Average Recorded Investment [Abstract]      
With no related allowance, average recorded investment 413 149  
With related allowance, average recorded investment 166 0  
Interest Income, Accrual Method [Abstract]      
With no related allowance, interest income, accrual method 2 2  
With related allowance, interest income, accrual method $ 0 $ 0