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Loans - Loans on Nonaccrual Status (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Loans on nonaccrual status      
Loans on nonaccrual status $ 2,213 $ 6,075  
Increase in interest income if recognized on nonaccrual loans 325 462 $ 304
Real estate - residential mortgage      
Loans on nonaccrual status      
Loans on nonaccrual status 594 830  
Commercial, financial and agricultural | Commercial real estate lending      
Loans on nonaccrual status      
Loans on nonaccrual status   3,796  
Commercial, financial and agricultural | Commercial business lending      
Loans on nonaccrual status      
Loans on nonaccrual status 24 34  
Equity lines      
Loans on nonaccrual status      
Loans on nonaccrual status 883 651  
Consumer Finance      
Loans on nonaccrual status      
Loans on nonaccrual status $ 712 $ 764