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Loans and Allowance for Loan Losses (Details 4) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Financing Receivable, Impaired [Line Items]      
Recorded Investment, With no related allowance recorded $ 1,611 $ 2,114  
Unpaid Principal Balance, With no related allowance recorded 1,777 2,263  
Recorded Investment, With an allowance recorded 7,713 7,030 $ 5,200
Unpaid Principal Balance, With an allowance recorded 8,045 7,228  
Specific Reserves, With an allowance recorded 1,103 1,080 $ 1,300
Total impaired loans, Recorded Investment 9,324 9,144  
Total impaired loans, Unpaid Principal Balance 9,822 9,491  
Commercial, financial, and agricultural      
Financing Receivable, Impaired [Line Items]      
Recorded Investment, With no related allowance recorded 406 564  
Unpaid Principal Balance, With no related allowance recorded 561 706  
Recorded Investment, With an allowance recorded 1,249 1,053  
Unpaid Principal Balance, With an allowance recorded 1,279 1,078  
Specific Reserves, With an allowance recorded 446 469  
Real estate - residential      
Financing Receivable, Impaired [Line Items]      
Recorded Investment, With no related allowance recorded 811 1,550  
Unpaid Principal Balance, With no related allowance recorded 822 1,557  
Recorded Investment, With an allowance recorded 4,764 3,921  
Unpaid Principal Balance, With an allowance recorded 4,823 3,990  
Specific Reserves, With an allowance recorded 354 319  
Real estate - commercial      
Financing Receivable, Impaired [Line Items]      
Recorded Investment, With no related allowance recorded 394    
Unpaid Principal Balance, With no related allowance recorded 394    
Recorded Investment, With an allowance recorded 1,592 1,918  
Unpaid Principal Balance, With an allowance recorded 1,802 1,988  
Specific Reserves, With an allowance recorded 284 277  
Real estate - commercial | Construction      
Financing Receivable, Impaired [Line Items]      
Recorded Investment, With an allowance recorded 49 49  
Unpaid Principal Balance, With an allowance recorded 55 56  
Specific Reserves, With an allowance recorded 7 7  
Installment Loans to Individuals      
Financing Receivable, Impaired [Line Items]      
Recorded Investment, With an allowance recorded 59 89  
Unpaid Principal Balance, With an allowance recorded 86 116  
Specific Reserves, With an allowance recorded $ 12 $ 8