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Loans and Related Allowance for Credit Losses (Impaired Loans by Loan Portfolio Class) (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Financing Receivable, Impaired [Line Items]    
Impaired Loans: Related Allowance $ 2 $ 0
Recorded Investment, Total 5,637 3,586
Unpaid Principal Balance, Total 7,740 5,613
Commercial, Financial and Agricultural [Member] | Commercial Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Recorded Investment 549 0
Impaired Loans with No Allowance: Unpaid Principal Balance 549 0
Impaired Loans: Related Allowance 0 0
Commercial Loan [Member] | Real Estate Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Recorded Investment 3,160 1,206
Impaired Loans with No Allowance: Unpaid Principal Balance 3,304 1,304
Impaired Loans: Related Allowance 0 0
Recorded Investment, Total 3,160 1,206
Unpaid Principal Balance, Total 3,304 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 354 366
Impaired Loans with No Allowance: Unpaid Principal Balance 390 395
Impaired Loans: Related Allowance 0 0
Recorded Investment, Total 354 366
Unpaid Principal Balance, Total 390 395
Construction Loan [Member] | Real Estate Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Recorded Investment 0 0
Impaired Loans with No Allowance: Unpaid Principal Balance 1,029 1,054
Impaired Loans: Related Allowance 0 0
Recorded Investment, Total 0 0
Unpaid Principal Balance, Total 1,029 1,054
Mortgage Loan [Member] | Consumer Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Recorded Investment 790 1,296
Impaired Loans with No Allowance: Unpaid Principal Balance 1,523 2,006
Impaired Loans with an Allowance: Recorded Investment 121 0
Impaired Loans with an Allowance: Unpaid Principal Balance 120 0
Impaired Loans: Related Allowance 2 0
Recorded Investment, Total 911 1,296
Unpaid Principal Balance, Total 1,643 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 663 704
Impaired Loans with No Allowance: Unpaid Principal Balance 825 840
Impaired Loans: Related Allowance 0 0
Recorded Investment, Total 663 704
Unpaid Principal Balance, Total 825 840
Personal Loan [Member] | Consumer Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Recorded Investment 0 14
Impaired Loans with No Allowance: Unpaid Principal Balance 0 14
Impaired Loans: Related Allowance 0 0
Recorded Investment, Total 0 14
Unpaid Principal Balance, Total $ 0 $ 14