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Loans - Loans on Nonaccrual Status (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Loans on nonaccrual status      
Loans on nonaccrual status $ 4,842 $ 6,987  
Increase in interest income if recognized on nonaccrual loans 304 531 $ 413
Real estate - residential mortgage      
Loans on nonaccrual status      
Loans on nonaccrual status 1,652 2,297  
Commercial, financial and agricultural | Commercial real estate lending      
Loans on nonaccrual status      
Loans on nonaccrual status 1,619 2,515  
Commercial, financial and agricultural | Builder line lending      
Loans on nonaccrual status      
Loans on nonaccrual status   359  
Commercial, financial and agricultural | Commercial business lending      
Loans on nonaccrual status      
Loans on nonaccrual status 131 86  
Equity lines      
Loans on nonaccrual status      
Loans on nonaccrual status 757 881  
Consumer Loan      
Loans on nonaccrual status      
Loans on nonaccrual status 118 19  
Consumer Finance      
Loans on nonaccrual status      
Loans on nonaccrual status $ 565 $ 830