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Loans - Recorded Investment, Unpaid Principal Balance, Related Allowance of Impaired Loans (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Credit Quality and Related Allowance for Loan Losses    
Recorded investment, with no related allowance recorded $ 6,973 $ 7,439
Recorded investment, with an allowance recorded 6,360 6,546
Recorded investment 13,333 13,985
Unpaid principal balance, with no related allowance recorded 6,973 7,439
Unpaid principal balance, with an allowance recorded 9,147 9,333
Unpaid principal balance 16,120 16,772
Related allowance 954 1,023
Commercial, financial, and agricultural    
Credit Quality and Related Allowance for Loan Losses    
Recorded investment, with no related allowance recorded 346 355
Recorded investment, with an allowance recorded 470 534
Recorded investment 816 889
Unpaid principal balance, with no related allowance recorded 346 355
Unpaid principal balance, with an allowance recorded 3,257 3,321
Unpaid principal balance 3,603 3,676
Related allowance 2 2
Real Estate Mortgages | Residential    
Credit Quality and Related Allowance for Loan Losses    
Recorded investment, with no related allowance recorded 3,678 3,874
Recorded investment, with an allowance recorded 1,159 1,178
Recorded investment 4,837 5,052
Unpaid principal balance, with no related allowance recorded 3,678 3,874
Unpaid principal balance, with an allowance recorded 1,159 1,178
Unpaid principal balance 4,837 5,052
Related allowance 192 201
Real Estate Mortgages | Commercial    
Credit Quality and Related Allowance for Loan Losses    
Recorded investment, with no related allowance recorded 2,884 3,105
Recorded investment, with an allowance recorded 4,712 4,814
Recorded investment 7,596 7,919
Unpaid principal balance, with no related allowance recorded 2,884 3,105
Unpaid principal balance, with an allowance recorded 4,712 4,814
Unpaid principal balance 7,596 7,919
Related allowance 741 800
Real Estate Mortgages | Construction    
Credit Quality and Related Allowance for Loan Losses    
Recorded investment, with no related allowance recorded 65 105
Recorded investment, with an allowance recorded 0 0
Recorded investment 65 105
Unpaid principal balance, with no related allowance recorded 65 105
Unpaid principal balance, with an allowance recorded 0 0
Unpaid principal balance 65 105
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 19 20
Recorded investment 19 20
Unpaid principal balance, with no related allowance recorded 0 0
Unpaid principal balance, with an allowance recorded 19 20
Unpaid principal balance 19 20
Related allowance $ 19 $ 20