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Loans and Allowance for Loan and Lease Losses (Impaired Loans by Loan Portfolio Class) (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Home Equity [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Recorded Investment $ 2,420 $ 2,365
Impaired Loans with No Allowance: Unpaid Principal Balance 2,423 2,395
Impaired Loans: Total Recorded Investment 2,420 2,365
Impaired Loans: Total Unpaid Principal Balance 2,434 2,408
Home Equity [Member] | Financial Asset Acquired with Credit Deterioration [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Unpaid Principal Balance 11 13
Commercial Portfolio [Member] | Commercial and Industrial [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Recorded Investment 5 899
Impaired Loans with No Allowance: Unpaid Principal Balance 36 931
Impaired Loans with Allowance: Recorded Investment 216 553
Impaired Loans with Allowance: Unpaid Principal Balance 247 574
Impaired Loans with Allowance: Related Allowance 69 533
Impaired Loans: Total Recorded Investment 221 1,452
Impaired Loans: Total Unpaid Principal Balance 283 1,505
Commercial Portfolio [Member] | Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Recorded Investment 920 8,215
Impaired Loans with No Allowance: Unpaid Principal Balance 1,309 8,574
Impaired Loans with Allowance: Recorded Investment 294 887
Impaired Loans with Allowance: Unpaid Principal Balance 363 994
Impaired Loans with Allowance: Related Allowance 129 274
Impaired Loans: Total Recorded Investment 2,569 10,521
Impaired Loans: Total Unpaid Principal Balance 3,262 11,261
Commercial Portfolio [Member] | Commercial Real Estate [Member] | Financial Asset Acquired with Credit Deterioration [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Recorded Investment 1,355 1,419
Impaired Loans with No Allowance: Unpaid Principal Balance 1,590 1,693
Commercial Portfolio [Member] | Commercial Real Estate - Construction [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Recorded Investment 22 31
Impaired Loans with No Allowance: Unpaid Principal Balance 27 34
Impaired Loans: Total Recorded Investment 22 31
Impaired Loans: Total Unpaid Principal Balance 27 34
Residential Portfolio [Member] | Residential Mortgage [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Recorded Investment 1,276 818
Impaired Loans with No Allowance: Unpaid Principal Balance 1,309 842
Impaired Loans: Total Recorded Investment 1,549 1,141
Impaired Loans: Total Unpaid Principal Balance 1,929 1,410
Residential Portfolio [Member] | Residential Mortgage [Member] | Financial Asset Acquired with Credit Deterioration [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired Loans with No Allowance: Recorded Investment 273 323
Impaired Loans with No Allowance: Unpaid Principal Balance $ 620 $ 568