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Loans and Related Allowance for Loan Losses (Impaired Loans and Related Interest Income by Loan Portfolio Class) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment, Total $ 6,733 $ 6,013 $ 5,872 $ 5,301
Interest Income Recognized, Total 58 9 176 18
Cash Basis Interest Income, Total 10 19 30 42
Commercial, Financial and Agricultural [Member] | Commercial Portfolio Segment [Member]        
Financing Receivable, Impaired [Line Items]        
Impaired Loans with No Allowance, Average Recorded Investment 0 581 0 384
Impaired Loans with No Allowance, Interest Income Recognized 0 0 0 0
Impaired Loans with No Allowance, Cash Basis Interest Income 0 0 0 0
Average Recorded Investment, Total 0 581 0 384
Interest Income Recognized, Total 0 0 0 0
Cash Basis Interest Income, Total 0 0 0 0
Commercial Loan [Member] | Commercial Portfolio Segment [Member]        
Financing Receivable, Impaired [Line Items]        
Impaired Loans with No Allowance, Average Recorded Investment 5,291 3,412 4,346 2,746
Impaired Loans with No Allowance, Interest Income Recognized 55 5 166 10
Impaired Loans with No Allowance, Cash Basis Interest Income 0 8 0 20
Average Recorded Investment, Total 5,291 3,412 4,346 2,746
Interest Income Recognized, Total 55 5 166 10
Cash Basis Interest Income, Total 0 8 0 20
Mortgage Loan [Member] | Consumer Portfolio Segment [Member]        
Financing Receivable, Impaired [Line Items]        
Impaired Loans with No Allowance, Average Recorded Investment 483 877 579 1,010
Impaired Loans with No Allowance, Interest Income Recognized 3 4 10 8
Impaired Loans with No Allowance, Cash Basis Interest Income 10 11 30 22
Impaired Loans with an Allowance, Average Recorded Investment 0 121 0 121
Impaired Loans with an Allowance, Interest Income Recognized 0 0 0 0
Impaired Loans with an Allowance, Cash Basis Interest Income 0 0 0 0
Average Recorded Investment, Total 483 998 579 1,131
Interest Income Recognized, Total 3 4 10 8
Cash Basis Interest Income, Total 10 11 30 22
Personal Loan [Member] | Consumer Portfolio Segment [Member]        
Financing Receivable, Impaired [Line Items]        
Impaired Loans with No Allowance, Average Recorded Investment     0 5
Impaired Loans with No Allowance, Interest Income Recognized     0 0
Impaired Loans with No Allowance, Cash Basis Interest Income     0 0
Average Recorded Investment, Total     0 5
Interest Income Recognized, Total     0 0
Cash Basis Interest Income, Total     0 0
Acquired with Credit Deterioration [Member] | Commercial Loan [Member] | Commercial Portfolio Segment [Member]        
Financing Receivable, Impaired [Line Items]        
Impaired Loans with No Allowance, Average Recorded Investment 364 354 345 357
Impaired Loans with No Allowance, Interest Income Recognized 0 0 0 0
Impaired Loans with No Allowance, Cash Basis Interest Income 0 0 0 0
Average Recorded Investment, Total 364 354 345 357
Interest Income Recognized, Total 0 0 0 0
Cash Basis Interest Income, Total 0 0 0 0
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 595 668 602 678
Impaired Loans with No Allowance, Interest Income Recognized 0 0 0 0
Impaired Loans with No Allowance, Cash Basis Interest Income 0 0 0 0
Average Recorded Investment, Total 595 668 602 678
Interest Income Recognized, Total 0 0 0 0
Cash Basis Interest Income, Total $ 0 $ 0 $ 0 $ 0