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Loans - Recorded Investment, Unpaid Principal Balance, Related Allowance of Impaired Loans (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Credit Quality and Related Allowance for Loan Losses    
Recorded investment, with no related allowance recorded $ 6,934 $ 6,333
Recorded investment, with an allowance recorded 13,173 14,914
Recorded investment 20,107 21,247
Unpaid principal balance, with no related allowance recorded 6,934 6,333
Unpaid principal balance, with an allowance recorded 13,172 14,914
Unpaid principal balance 20,106 21,247
Related allowance 2,228 2,543
Commercial, financial, and agricultural    
Credit Quality and Related Allowance for Loan Losses    
Recorded investment, with no related allowance recorded 1,242 1,152
Recorded investment, with an allowance recorded 4,100 4,111
Recorded investment 5,342 5,263
Unpaid principal balance, with no related allowance recorded 1,242 1,152
Unpaid principal balance, with an allowance recorded 4,100 4,111
Unpaid principal balance 5,342 5,263
Related allowance 644 650
Real Estate Mortgages | Residential    
Credit Quality and Related Allowance for Loan Losses    
Recorded investment, with no related allowance recorded 2,372 2,619
Recorded investment, with an allowance recorded 1,743 1,591
Recorded investment 4,115 4,210
Unpaid principal balance, with no related allowance recorded 2,372 2,619
Unpaid principal balance, with an allowance recorded 1,742 1,591
Unpaid principal balance 4,114 4,210
Related allowance 286 168
Real Estate Mortgages | Commercial    
Credit Quality and Related Allowance for Loan Losses    
Recorded investment, with no related allowance recorded 3,238 2,457
Recorded investment, with an allowance recorded 7,236 9,207
Recorded investment 10,474 11,664
Unpaid principal balance, with no related allowance recorded 3,238 2,457
Unpaid principal balance, with an allowance recorded 7,236 9,207
Unpaid principal balance 10,474 11,664
Related allowance 1,253 1,720
Real Estate Mortgages | Construction    
Credit Quality and Related Allowance for Loan Losses    
Recorded investment, with no related allowance recorded 72 74
Recorded investment, with an allowance recorded 0 0
Recorded investment 72 74
Unpaid principal balance, with no related allowance recorded 72 74
Unpaid principal balance, with an allowance recorded 0 0
Unpaid principal balance 72 74
Related allowance 0 0
Real Estate Mortgages | Installment loans to individuals    
Credit Quality and Related Allowance for Loan Losses    
Recorded investment, with no related allowance recorded 5 0
Recorded investment, with an allowance recorded 26 5
Recorded investment 31 5
Unpaid principal balance, with no related allowance recorded 5 0
Unpaid principal balance, with an allowance recorded 26 5
Unpaid principal balance 31 5
Related allowance 13 5
Consumer automobile loans    
Credit Quality and Related Allowance for Loan Losses    
Recorded investment, with no related allowance recorded 5 31
Recorded investment, with an allowance recorded 68 0
Recorded investment 73 31
Unpaid principal balance, with no related allowance recorded 5 31
Unpaid principal balance, with an allowance recorded 68 0
Unpaid principal balance 73 31
Related allowance $ 32 $ 0