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Loans - Troubled Debt Restructurings (Details)
12 Months Ended 24 Months Ended
Dec. 31, 2019
USD ($)
loan
item
Dec. 31, 2018
USD ($)
loan
item
Dec. 31, 2017
Dec. 31, 2017
loan
Dec. 31, 2017
item
Dec. 31, 2017
USD ($)
Dec. 31, 2019
Loan modifications classified as troubled debt restructurings              
Number of Loans 3 2       9,000  
Recorded Investment $ 216,000 $ 145       $ 7,165,000  
TDR payment default period             12 months
Period determining when a past due TDR becomes a subsequent default     90 days       90 days
Recorded Investment, TDR payment defaults $ 0 $ 0       $ 4,650,000  
Modifications of interest rate              
Loan modifications classified as troubled debt restructurings              
Number of Loans | item 1 1     9    
modifications of payment structure              
Loan modifications classified as troubled debt restructurings              
Number of Loans | item 2 1          
Modification of term              
Loan modifications classified as troubled debt restructurings              
Number of Loans       3 3    
Reduction in principal              
Loan modifications classified as troubled debt restructurings              
Number of Loans | item 0 0     0    
Real estate - residential mortgage              
Loan modifications classified as troubled debt restructurings              
Number of Loans 2 1       2,000  
Recorded Investment $ 95,000 $ 140       $ 365,000  
Commercial, financial and agricultural | Commercial real estate lending              
Loan modifications classified as troubled debt restructurings              
Number of Loans           7,000  
Recorded Investment           $ 6,800,000  
Consumer              
Loan modifications classified as troubled debt restructurings              
Number of Loans | loan 1 1          
Recorded Investment $ 121,000 $ 5