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Loans and Allowance for Loan Losses (Details 4) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]    
Recorded Investment, With no related allowance recorded $ 3,334 $ 2,433
Unpaid Principal Balance, With no related allowance recorded 3,477 2,528
Recorded Investment, With an allowance recorded 6,917 7,923
Unpaid Principal Balance, With an allowance recorded 7,481 8,370
Specific Reserves, With an allowance recorded 1,282 1,333
Total impaired loans, Recorded Investment 10,251 10,356
Total impaired loans, Unpaid Principal Balance 10,958 10,898
Commercial, financial, and agricultural    
Financing Receivable, Impaired [Line Items]    
Recorded Investment, With no related allowance recorded 1,282 1,393
Unpaid Principal Balance, With no related allowance recorded 1,351 1,445
Recorded Investment, With an allowance recorded 1,605 1,614
Unpaid Principal Balance, With an allowance recorded 1,927 1,834
Specific Reserves, With an allowance recorded 410 500
Residential Real Estate    
Financing Receivable, Impaired [Line Items]    
Recorded Investment, With no related allowance recorded 993 674
Unpaid Principal Balance, With no related allowance recorded 1,048 688
Recorded Investment, With an allowance recorded 4,193 4,398
Unpaid Principal Balance, With an allowance recorded 4,287 4,500
Specific Reserves, With an allowance recorded 668 521
Residential Real Estate | Construction    
Financing Receivable, Impaired [Line Items]    
Recorded Investment, With no related allowance recorded 0  
Unpaid Principal Balance, With no related allowance recorded 0  
Recorded Investment, With an allowance recorded 0  
Unpaid Principal Balance, With an allowance recorded 0  
Specific Reserves, With an allowance recorded 0  
Real estate - commercial    
Financing Receivable, Impaired [Line Items]    
Recorded Investment, With no related allowance recorded 753 366
Unpaid Principal Balance, With no related allowance recorded 753 395
Recorded Investment, With an allowance recorded 952 1,638
Unpaid Principal Balance, With an allowance recorded 1,078 1,743
Specific Reserves, With an allowance recorded 185 243
Real estate - commercial | Construction    
Financing Receivable, Impaired [Line Items]    
Recorded Investment, With no related allowance recorded 169  
Unpaid Principal Balance, With no related allowance recorded 188  
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 no related allowance recorded 137  
Unpaid Principal Balance, With no related allowance recorded 137  
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 167  
Unpaid Principal Balance, With an allowance recorded 189  
Specific Reserves, With an allowance recorded $ 19