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Loans - Recorded Investment, Unpaid Principal Balance, Related Allowance of Impaired Loans (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Credit Quality and Related Allowance for Loan Losses    
Recorded investment, with no related allowance recorded $ 11,731 $ 12,393
Recorded investment, with an allowance recorded 4,671 4,854
Recorded investment 16,402 17,247
Unpaid principal balance, with no related allowance recorded 14,518 15,180
Unpaid principal balance, with an allowance recorded 4,721 4,936
Unpaid principal balance 19,239 20,116
Related allowance 1,244 1,393
Commercial, financial, and agricultural    
Credit Quality and Related Allowance for Loan Losses    
Recorded investment, with no related allowance recorded 1,921 2,285
Recorded investment, with an allowance recorded 104 0
Recorded investment 2,025 2,285
Unpaid principal balance, with no related allowance recorded 4,708 5,072
Unpaid principal balance, with an allowance recorded 104 0
Unpaid principal balance 4,812 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 4,656 5,008
Recorded investment, with an allowance recorded 1,074 1,168
Recorded investment 5,730 6,176
Unpaid principal balance, with no related allowance recorded 4,656 5,008
Unpaid principal balance, with an allowance recorded 1,074 1,200
Unpaid principal balance 5,730 6,208
Related allowance 177 211
Real Estate Mortgages | Commercial    
Credit Quality and Related Allowance for Loan Losses    
Recorded investment, with no related allowance recorded 5,089 5,035
Recorded investment, with an allowance recorded 3,472 3,540
Recorded investment 8,561 8,575
Unpaid principal balance, with no related allowance recorded 5,089 5,035
Unpaid principal balance, with an allowance recorded 3,522 3,590
Unpaid principal balance 8,611 8,625
Related allowance 1,062 1,104
Real Estate Mortgages | Construction    
Credit Quality and Related Allowance for Loan Losses    
Recorded investment, with no related allowance recorded 65 65
Recorded investment, with an allowance recorded 0 0
Recorded investment 65 65
Unpaid principal balance, with no related allowance recorded 65 65
Unpaid principal balance, with an allowance recorded 0 0
Unpaid principal balance 65 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 21 130
Recorded investment 21 130
Unpaid principal balance, with no related allowance recorded 0 0
Unpaid principal balance, with an allowance recorded 21 130
Unpaid principal balance 21 130
Related allowance 5 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