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Loans and Related Allowance for Credit Losses (Impaired Loans and Related Interest Income by Loan Portfolio Class) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment, Total $ 4,595 $ 3,833
Interest Income Recognized, Total 9 8
Cash Basis Interest Income, Total 23 12
Commercial, Financial and Agricultural [Member] | Commercial Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment, Total 187  
Commercial Loan [Member] | Commercial Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with an Allowance: Average Recorded Investment 187  
Commercial Loan [Member] | Real Estate Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Average Recorded Investment 2,080 1,062
Impaired Loans with No Allowance: Interest Income Recognized 5  
Impaired Loans with No Allowance: Cash Basis Interest Income 12 3
Average Recorded Investment, Total 2,080 1,062
Interest Income Recognized, Total 5 3
Cash Basis Interest Income, Total 12  
Construction Loan [Member] | Real Estate Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Average Recorded Investment   14
Average Recorded Investment, Total   14
Mortgage Loan [Member] | Consumer Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Average Recorded Investment 1,139 1,245
Impaired Loans with No Allowance: Interest Income Recognized 4 5
Impaired Loans with No Allowance: Cash Basis Interest Income 11 12
Impaired Loans with an Allowance: Average Recorded Investment 126  
Average Recorded Investment, Total 1,265 1,245
Interest Income Recognized, Total 4 5
Cash Basis Interest Income, Total 11 12
Personal Loan [Member] | Consumer Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Average Recorded Investment 9 16
Average Recorded Investment, Total 9 16
Acquired with Credit Deterioration [Member] | Commercial Loan [Member] | Real Estate Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Average Recorded Investment 361 538
Average Recorded Investment, Total 361 538
Acquired with Credit Deterioration [Member] | Mortgage Loan [Member] | Consumer Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Average Recorded Investment 693 958
Average Recorded Investment, Total $ 693 $ 958