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Loans and Allowance for Loan and Lease Losses (Impaired Loans by Loan Portfolio Class) (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Home Equity [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with No Allowance: Recorded Investment | $ 2,334 | $ 2,365
Impaired Loans with No Allowance: Unpaid Principal Balance | 2,337 | 2,395
Impaired Loans: Total Recorded Investment | 2,334 | 2,365
Impaired Loans: Total Unpaid Principal Balance | 2,349 | 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 | 12 | 13
Commercial Portfolio [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with No Allowance: Recorded Investment | 143 | 899
Impaired Loans with No Allowance: Unpaid Principal Balance | 174 | 931
Impaired Loans with Allowance: Recorded Investment | 225 | 553
Impaired Loans with Allowance: Unpaid Principal Balance | 253 | 574
Impaired Loans with Allowance: Related Allowance | 68 | 533
Impaired Loans: Total Recorded Investment | 368 | 1,452
Impaired Loans: Total Unpaid Principal Balance | 427 | 1,505
Commercial Portfolio [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with No Allowance: Recorded Investment | 595 | 8,215
Impaired Loans with No Allowance: Unpaid Principal Balance | 973 | 8,574
Impaired Loans with Allowance: Recorded Investment | 874 | 887
Impaired Loans with Allowance: Unpaid Principal Balance | 926 | 994
Impaired Loans with Allowance: Related Allowance | 263 | 274
Impaired Loans: Total Recorded Investment | 2,877 | 10,521
Impaired Loans: Total Unpaid Principal Balance | 3,589 | 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 | 1,408 | 1,419
Impaired Loans with No Allowance: Unpaid Principal Balance | 1,690 | 1,693
Commercial Portfolio [Member] | Commercial Real Estate - Construction [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with No Allowance: Recorded Investment | 30 | 31
Impaired Loans with No Allowance: Unpaid Principal Balance | 34 | 34
Impaired Loans: Total Recorded Investment | 30 | 31
Impaired Loans: Total Unpaid Principal Balance | 34 | 34
Residential Portfolio [Member] | Residential Mortgage [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with No Allowance: Recorded Investment | 758 | 818
Impaired Loans with No Allowance: Unpaid Principal Balance | 786 | 842
Impaired Loans: Total Recorded Investment | 1,067 | 1,141
Impaired Loans: Total Unpaid Principal Balance | 1,343 | 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 | 309 | 323
Impaired Loans with No Allowance: Unpaid Principal Balance | $ 557 | $ 568

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