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LOAN CREDIT QUALITY AND RELATED ALLOWANCE FOR LOAN LOSSES - Recorded Investment, Unpaid Principal Balance, Related Allowance of Impaired Loans (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Credit Quality and Related Allowance for Loan Losses    
Recorded investment, with no related allowance recorded $ 7,439 $ 12,366
Recorded investment, with an allowance recorded 6,546 4,317
Recorded Investment 13,985 16,683
Unpaid principal balance, with no related allowance recorded 7,439 15,153
Unpaid principal balance, with an allowance recorded 9,333 4,317
Unpaid Principal Balance 16,772 19,470
Related Allowance 1,023 1,035
Commercial, financial, and agricultural    
Credit Quality and Related Allowance for Loan Losses    
Recorded investment, with no related allowance recorded 355 865
Recorded investment, with an allowance recorded 534 0
Recorded Investment 889 865
Unpaid principal balance, with no related allowance recorded 355 3,652
Unpaid principal balance, with an allowance recorded 3,321 0
Unpaid Principal Balance 3,676 3,652
Related Allowance 2 0
Real estate mortgage: | Residential    
Credit Quality and Related Allowance for Loan Losses    
Recorded investment, with no related allowance recorded 3,874 5,023
Recorded investment, with an allowance recorded 1,178 1,294
Recorded Investment 5,052 6,317
Unpaid principal balance, with no related allowance recorded 3,874 5,023
Unpaid principal balance, with an allowance recorded 1,178 1,294
Unpaid Principal Balance 5,052 6,317
Related Allowance 201 224
Real estate mortgage: | Commercial    
Credit Quality and Related Allowance for Loan Losses    
Recorded investment, with no related allowance recorded 3,105 6,354
Recorded investment, with an allowance recorded 4,814 3,023
Recorded Investment 7,919 9,377
Unpaid principal balance, with no related allowance recorded 3,105 6,354
Unpaid principal balance, with an allowance recorded 4,814 3,023
Unpaid Principal Balance 7,919 9,377
Related Allowance 800 811
Real estate mortgage: | Construction    
Credit Quality and Related Allowance for Loan Losses    
Recorded investment, with no related allowance recorded 105 124
Recorded investment, with an allowance recorded 0 0
Recorded Investment 105 124
Unpaid principal balance, with no related allowance recorded 105 124
Unpaid principal balance, with an allowance recorded 0 0
Unpaid Principal Balance 105 124
Related Allowance 0 0
Consumer automobile loans    
Credit Quality and Related Allowance for Loan Losses    
Recorded investment, with no related allowance recorded 0 0
Recorded investment, with an allowance recorded 0 0
Recorded Investment 0 0
Unpaid principal balance, with no related allowance recorded 0 0
Unpaid principal balance, with an allowance recorded 0 0
Unpaid Principal Balance 0 0
Related Allowance 0 0
Installment loans to individuals    
Credit Quality and Related Allowance for Loan Losses    
Recorded investment, with no related allowance recorded 0 0
Recorded investment, with an allowance recorded 20 0
Recorded Investment 20 0
Unpaid principal balance, with no related allowance recorded 0 0
Unpaid principal balance, with an allowance recorded 20 0
Unpaid Principal Balance 20 0
Related Allowance $ 20 $ 0