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Loans and Allowance for Loan Losses (Details 4) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]    
Recorded Investment, With no related allowance recorded $ 1,999 $ 2,433
Unpaid Principal Balance, With no related allowance recorded 2,106 2,528
Recorded Investment, With an allowance recorded 8,094 7,923
Unpaid Principal Balance, With an allowance recorded 8,665 8,370
Specific Reserves, With an allowance recorded 1,336 1,333
Total impaired loans, Recorded Investment 10,093 10,356
Total impaired loans, Unpaid Principal Balance 10,771 10,898
Commercial, financial, and agricultural    
Financing Receivable, Impaired [Line Items]    
Recorded Investment, With no related allowance recorded 1,091 1,393
Unpaid Principal Balance, With no related allowance recorded 1,151 1,445
Recorded Investment, With an allowance recorded 1,647 1,614
Unpaid Principal Balance, With an allowance recorded 1,960 1,834
Specific Reserves, With an allowance recorded 495 500
Residential Real Estate    
Financing Receivable, Impaired [Line Items]    
Recorded Investment, With no related allowance recorded 908 674
Unpaid Principal Balance, With no related allowance recorded 955 688
Recorded Investment, With an allowance recorded 4,250 4,398
Unpaid Principal Balance, With an allowance recorded 4,344 4,500
Specific Reserves, With an allowance recorded 580 521
Residential Real Estate | Construction    
Financing Receivable, Impaired [Line Items]    
Recorded Investment, With an allowance recorded 59  
Unpaid Principal Balance, With an allowance recorded 59  
Specific Reserves, With an allowance recorded 9  
Real estate - commercial    
Financing Receivable, Impaired [Line Items]    
Recorded Investment, With no related allowance recorded   366
Unpaid Principal Balance, With no related allowance recorded   395
Recorded Investment, With an allowance recorded 1,978 1,638
Unpaid Principal Balance, With an allowance recorded 2,123 1,743
Specific Reserves, With an allowance recorded 233 243
Real estate - commercial | Construction    
Financing Receivable, Impaired [Line Items]    
Recorded Investment, With an allowance recorded   97
Unpaid Principal Balance, With an allowance recorded   97
Specific Reserves, With an allowance recorded   48
Consumer    
Financing Receivable, Impaired [Line Items]    
Recorded Investment, With an allowance recorded   176
Unpaid Principal Balance, With an allowance recorded   196
Specific Reserves, With an allowance recorded   $ 21
Installment and other consumer    
Financing Receivable, Impaired [Line Items]    
Recorded Investment, With an allowance recorded 160  
Unpaid Principal Balance, With an allowance recorded 179  
Specific Reserves, With an allowance recorded $ 19