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Loans - Troubled Debt Restructurings (Details)
$ in Thousands
12 Months Ended 24 Months Ended
Dec. 31, 2017
USD ($)
loan
Dec. 31, 2016
USD ($)
loan
Dec. 31, 2017
Loan modifications classified as troubled debt restructurings      
Number of Loans | loan 9 11  
Pre-Modification Recorded Investment (in Dollars) $ 7,165 $ 1,779  
Post-Modification Recorded Investment (in Dollars) 7,165 1,804  
TDR payment default period     12 months
Period determining when a past due TDR becomes a subsequent default     90 days
TDR payment defaults $ 3,790 $ 0  
Real estate - residential mortgage | Interest rate concession      
Loan modifications classified as troubled debt restructurings      
Number of Loans | loan 2 5  
Pre-Modification Recorded Investment (in Dollars) $ 365 $ 1,136  
Post-Modification Recorded Investment (in Dollars) $ 365 $ 1,161  
Commercial, financial and agricultural | Commercial real estate lending | Interest rate concession      
Loan modifications classified as troubled debt restructurings      
Number of Loans | loan 4 3  
Pre-Modification Recorded Investment (in Dollars) $ 2,154 $ 227  
Post-Modification Recorded Investment (in Dollars) $ 2,154 $ 227  
Commercial, financial and agricultural | Commercial real estate lending | Interest rate and term concession      
Loan modifications classified as troubled debt restructurings      
Number of Loans | loan 3    
Pre-Modification Recorded Investment (in Dollars) $ 4,646    
Post-Modification Recorded Investment (in Dollars) $ 4,646    
Commercial, financial and agricultural | Commercial business lending | Interest rate concession      
Loan modifications classified as troubled debt restructurings      
Number of Loans | loan   1  
Pre-Modification Recorded Investment (in Dollars)   $ 100  
Post-Modification Recorded Investment (in Dollars)   $ 100  
Commercial, financial and agricultural | Commercial business lending | Term concession      
Loan modifications classified as troubled debt restructurings      
Number of Loans | loan   1  
Pre-Modification Recorded Investment (in Dollars)   $ 25  
Post-Modification Recorded Investment (in Dollars)   $ 25  
Consumer Loan | Interest rate concession      
Loan modifications classified as troubled debt restructurings      
Number of Loans | loan   1  
Pre-Modification Recorded Investment (in Dollars)   $ 291  
Post-Modification Recorded Investment (in Dollars)   $ 291