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Loans - Troubled Debt Restructurings (Details)
Unit12 in Thousands
12 Months Ended 24 Months Ended
Dec. 31, 2018
USD ($)
loan
item
Dec. 31, 2017
USD ($)
loan
item
Dec. 31, 2016
USD ($)
item
Dec. 31, 2018
Loan modifications classified as troubled debt restructurings        
Number of Loans 2   11  
Pre-Modification Recorded Investment (in Dollars) $ 145,000 $ 7,165    
Post-Modification Recorded Investment (in Dollars)     $ 1,779,000  
TDR payment default period       12 months
Period determining when a past due TDR becomes a subsequent default       90 days
TDR payment defaults $ 0 $ 4,650,000    
Interest rate concession        
Loan modifications classified as troubled debt restructurings        
Number of Loans | item 1 9 10  
Term concession        
Loan modifications classified as troubled debt restructurings        
Number of Loans | item 1 3 1  
Real estate - residential mortgage | Interest rate concession        
Loan modifications classified as troubled debt restructurings        
Number of Loans 1 2 5  
Pre-Modification Recorded Investment (in Dollars) $ 140,000 $ 365    
Post-Modification Recorded Investment (in Dollars)     $ 1,136,000  
Commercial, financial and agricultural | Commercial real estate lending | Interest rate concession        
Loan modifications classified as troubled debt restructurings        
Number of Loans     2  
Post-Modification Recorded Investment (in Dollars)     $ 125,000  
Commercial, financial and agricultural | Commercial real estate lending | Interest rate and term concession        
Loan modifications classified as troubled debt restructurings        
Number of Loans   7 3  
Pre-Modification Recorded Investment (in Dollars)   $ 6,800    
Post-Modification Recorded Investment (in Dollars)     $ 227,000  
TDR payment defaults   $ 3    
Consumer Loan | Interest rate concession        
Loan modifications classified as troubled debt restructurings        
Number of Loans 1   1  
Pre-Modification Recorded Investment (in Dollars) $ 5,000      
Post-Modification Recorded Investment (in Dollars)     $ 291,000