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Loans and Related Allowance for Credit Losses (Impaired Loans by Loan Portfolio Class) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]    
Recorded Investment, Total $ 3,586 $ 3,648
Unpaid Principal Balance, Total 5,613 6,008
Commercial Loan [Member] | Real Estate Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Recorded Investment 1,206 909
Impaired Loans with No Allowance: Unpaid Principal Balance 1,304 1,303
Recorded Investment, Total 1,206 909
Unpaid Principal Balance, Total 1,304 1,303
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 366 544
Impaired Loans with No Allowance: Unpaid Principal Balance 395 592
Recorded Investment, Total 366 544
Unpaid Principal Balance, Total 395 592
Construction Loan [Member] | Real Estate Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Recorded Investment   27
Impaired Loans with No Allowance: Unpaid Principal Balance 1,054 1,123
Recorded Investment, Total   27
Unpaid Principal Balance, Total 1,054 1,123
Mortgage Loan [Member] | Consumer Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Recorded Investment 1,296 1,180
Impaired Loans with No Allowance: Unpaid Principal Balance 2,006 1,912
Recorded Investment, Total 1,296 1,180
Unpaid Principal Balance, Total 2,006 1,912
Mortgage Loan [Member] | Consumer Portfolio Segment [Member] | Acquired with Credit Deterioration [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Recorded Investment 704 971
Impaired Loans with No Allowance: Unpaid Principal Balance 840 1,061
Recorded Investment, Total 704 971
Unpaid Principal Balance, Total 840 1,061
Personal Loan [Member] | Consumer Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Recorded Investment 14 17
Impaired Loans with No Allowance: Unpaid Principal Balance 14 17
Recorded Investment, Total 14 17
Unpaid Principal Balance, Total $ 14 $ 17