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Loans and Related Allowance for Credit Losses (Impaired Loans by Loan Portfolio Class) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Financing Receivable, Impaired [Line Items]    
Impaired Loans: Related Allowance $ 125  
Recorded Investment, Total 6,685 $ 3,586
Unpaid Principal Balance, Total 8,739 5,613
Commercial, Financial and Agricultural [Member] | Commercial Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Recorded Investment 562  
Impaired Loans with No Allowance: Unpaid Principal Balance 562  
Impaired Loans with an Allowance: Recorded Investment 562  
Impaired Loans with an Allowance: Unpaid Principal Balance 562  
Impaired Loans: Related Allowance 118  
Commercial Loan [Member] | Real Estate Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Recorded Investment 3,836 1,206
Impaired Loans with No Allowance: Unpaid Principal Balance 3,934 1,304
Recorded Investment, Total 3,836 1,206
Unpaid Principal Balance, Total 3,934 1,304
Commercial Loan [Member] | Real Estate Portfolio Segment [Member] | Acquired with Credit Deterioration [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Recorded Investment 356 366
Impaired Loans with No Allowance: Unpaid Principal Balance 390 395
Recorded Investment, Total 356 366
Unpaid Principal Balance, Total 390 395
Construction Loan [Member] | Real Estate Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Unpaid Principal Balance 1,045 1,054
Unpaid Principal Balance, Total 1,045 1,054
Mortgage Loan [Member] | Consumer Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Recorded Investment 1,125 1,296
Impaired Loans with No Allowance: Unpaid Principal Balance 1,852 2,006
Impaired Loans with an Allowance: Recorded Investment 125  
Impaired Loans with an Allowance: Unpaid Principal Balance 124  
Impaired Loans: Related Allowance 7  
Recorded Investment, Total 1,250 1,296
Unpaid Principal Balance, Total 1,976 2,006
Mortgage Loan [Member] | Consumer Portfolio Segment [Member] | Acquired with Credit Deterioration [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Recorded Investment 681 704
Impaired Loans with No Allowance: Unpaid Principal Balance 832 840
Recorded Investment, Total 681 704
Unpaid Principal Balance, Total $ 832 840
Personal Loan [Member] | Consumer Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Recorded Investment   14
Impaired Loans with No Allowance: Unpaid Principal Balance   14
Recorded Investment, Total   14
Unpaid Principal Balance, Total   $ 14