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Loans and Related Allowance for Loan Losses (Impaired Loans by Loan Portfolio Class) (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Financing Receivable, Impaired [Line Items]    
Impaired Loans: Related Allowance   $ 2
Recorded Investment, Total $ 6,722 5,189
Unpaid Principal Balance, Total 8,933 7,134
Commercial Loan [Member] | Commercial Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Recorded Investment 5,283 3,483
Impaired Loans with No Allowance: Unpaid Principal Balance 5,744 3,580
Impaired Loans: Related Allowance 0 0
Recorded Investment, Total 5,283 3,483
Unpaid Principal Balance, Total 5,744 3,580
Commercial Loan [Member] | Commercial Portfolio Segment [Member] | Acquired with Credit Deterioration [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Recorded Investment 369 339
Impaired Loans with No Allowance: Unpaid Principal Balance 376 386
Impaired Loans: Related Allowance 0 0
Recorded Investment, Total 369 339
Unpaid Principal Balance, Total 376 386
Construction Loan [Member] | Commercial 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 859 894
Impaired Loans: Related Allowance 0 0
Recorded Investment, Total 0 0
Unpaid Principal Balance, Total 859 894
Mortgage Loan [Member] | Consumer Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Recorded Investment 466 666
Impaired Loans with No Allowance: Unpaid Principal Balance 1,168 1,396
Impaired Loans with an Allowance: Recorded Investment   78
Impaired Loans with an Allowance: Unpaid Principal Balance   77
Impaired Loans: Related Allowance 0 2
Recorded Investment, Total 466 744
Unpaid Principal Balance, Total 1,168 1,473
Mortgage Loan [Member] | Consumer Portfolio Segment [Member] | Acquired with Credit Deterioration [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Recorded Investment 604 623
Impaired Loans with No Allowance: Unpaid Principal Balance 786 801
Impaired Loans: Related Allowance 0 0
Recorded Investment, Total 604 623
Unpaid Principal Balance, Total $ 786 $ 801