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Allowance for Credit Losses (Non-accrual Basis By Loan Class) (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Loan loss allowances, financing receivable past due    
Non-accrual loans, total $ 3,761 $ 4,886
Commercial, financial and agricultural | Domestic | Commercial    
Loan loss allowances, financing receivable past due    
Non-accrual loans, total 1,444 1,901
Commercial, financial and agricultural | Domestic | Commercial Real Estate: farmland and commercial    
Loan loss allowances, financing receivable past due    
Non-accrual loans, total 501 1,208
Commercial, financial and agricultural | Domestic | Commercial Real Estate: multifamily    
Loan loss allowances, financing receivable past due    
Non-accrual loans, total 137 165
Real estate - construction | Domestic | Commercial Real Estate: other construction and land development    
Loan loss allowances, financing receivable past due    
Non-accrual loans, total 911 938
Real estate - mortgage | Domestic | Residential First Lien    
Loan loss allowances, financing receivable past due    
Non-accrual loans, total 727 670
Real estate - mortgage | Domestic | Residential Junior Lien    
Loan loss allowances, financing receivable past due    
Non-accrual loans, total 38  
Consumer | Domestic    
Loan loss allowances, financing receivable past due    
Non-accrual loans, total $ 3 $ 4