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Loans - Recorded Investment, Unpaid Principal Balance, Related Allowance of Impaired Loans (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Credit Quality and Related Allowance for Loan Losses    
Recorded investment, with no related allowance recorded $ 10,298 $ 12,393
Recorded investment, with an allowance recorded 4,379 4,854
Recorded investment 14,677 17,247
Unpaid principal balance, with no related allowance recorded 13,085 15,180
Unpaid principal balance, with an allowance recorded 4,379 4,936
Unpaid principal balance 17,464 20,116
Related allowance 1,107 1,393
Commercial, financial, and agricultural    
Credit Quality and Related Allowance for Loan Losses    
Recorded investment, with no related allowance recorded 1,820 2,285
Recorded investment, with an allowance recorded 15 0
Recorded investment 1,835 2,285
Unpaid principal balance, with no related allowance recorded 4,607 5,072
Unpaid principal balance, with an allowance recorded 15 0
Unpaid principal balance 4,622 5,072
Related allowance 0 0
Real Estate Mortgages | Residential    
Credit Quality and Related Allowance for Loan Losses    
Recorded investment, with no related allowance recorded 4,305 5,008
Recorded investment, with an allowance recorded 1,272 1,168
Recorded investment 5,577 6,176
Unpaid principal balance, with no related allowance recorded 4,305 5,008
Unpaid principal balance, with an allowance recorded 1,272 1,200
Unpaid principal balance 5,577 6,208
Related allowance 187 211
Real Estate Mortgages | Commercial    
Credit Quality and Related Allowance for Loan Losses    
Recorded investment, with no related allowance recorded 4,113 5,035
Recorded investment, with an allowance recorded 3,092 3,540
Recorded investment 7,205 8,575
Unpaid principal balance, with no related allowance recorded 4,113 5,035
Unpaid principal balance, with an allowance recorded 3,092 3,590
Unpaid principal balance 7,205 8,625
Related allowance 920 1,104
Real Estate Mortgages | Construction    
Credit Quality and Related Allowance for Loan Losses    
Recorded investment, with no related allowance recorded 60 65
Recorded investment, with an allowance recorded 0 0
Recorded investment 60 65
Unpaid principal balance, with no related allowance recorded 60 65
Unpaid principal balance, with an allowance recorded 0 0
Unpaid principal balance 60 65
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 0 130
Recorded investment 0 130
Unpaid principal balance, with no related allowance recorded 0 0
Unpaid principal balance, with an allowance recorded 0 130
Unpaid principal balance 0 130
Related allowance 0 62
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 0 16
Recorded investment 0 16
Unpaid principal balance, with no related allowance recorded 0 0
Unpaid principal balance, with an allowance recorded 0 16
Unpaid principal balance 0 16
Related allowance $ 0 $ 16