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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
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment, Total $ 4,168 $ 5,955
Interest Income Recognized, Total 84 19
Cash Basis Interest Income, Total 88 33
Commercial, Financial and Agricultural [Member] | Commercial Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Average Recorded Investment 549 234
Impaired Loans with No Allowance: Interest Income Recognized 22  
Impaired Loans with No Allowance: Cash Basis Interest Income 15  
Average Recorded Investment, Total 549 234
Interest Income Recognized, Total 22  
Cash Basis Interest Income, Total 15  
Commercial Loan [Member] | Real Estate Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Average Recorded Investment 1,058 2,970
Impaired Loans with No Allowance: Interest Income Recognized 45  
Impaired Loans with No Allowance: Cash Basis Interest Income 28  
Average Recorded Investment, Total 1,058 2,970
Interest Income Recognized, Total 45  
Cash Basis Interest Income, Total 28  
Construction Loan [Member] | Real Estate Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Average Recorded Investment 14 14
Average Recorded Investment, Total 14 14
Mortgage Loan [Member] | Consumer Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Average Recorded Investment 1,238 1,706
Impaired Loans with No Allowance: Interest Income Recognized 17 19
Impaired Loans with No Allowance: Cash Basis Interest Income 45 33
Average Recorded Investment, Total 1,238 1,706
Interest Income Recognized, Total 17 19
Cash Basis Interest Income, Total 45 33
Personal Loan [Member] | Consumer Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Average Recorded Investment 16 9
Average Recorded Investment, Total 16 9
Acquired with Credit Deterioration [Member] | Commercial Loan [Member] | Real Estate Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment, Total 455 368
Acquired with Credit Deterioration [Member] | Construction Loan [Member] | Real Estate Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Average Recorded Investment 455 368
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 838 654
Average Recorded Investment, Total $ 838 $ 654