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Loans and Allowance for Loan and Lease Losses (Impaired Loans by Loan Portfolio Class) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Home Equity [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with No Allowance: Recorded Investment | $ 2,365 | $ 25
Impaired Loans with No Allowance: Unpaid Principal Balance | 2,395 | 27
Impaired Loans: Total Recorded Investment | 2,365 | 26
Impaired Loans: Total Unpaid Principal Balance | 2,408 | 32
Home Equity [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with No Allowance: Recorded Investment |  | 1
Impaired Loans with No Allowance: Unpaid Principal Balance | 13 | 5
Commercial Portfolio [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with No Allowance: Recorded Investment | 899 | 890
Impaired Loans with No Allowance: Unpaid Principal Balance | 931 | 890
Impaired Loans with Allowance: Recorded Investment | 553 |
Impaired Loans with Allowance: Unpaid Principal Balance | 574 |
Impaired Loans with Allowance: Related Allowance | 533 |
Impaired Loans: Total Recorded Investment | 1,452 | 893
Impaired Loans: Total Unpaid Principal Balance | 1,505 | 958
Commercial Portfolio [Member] | Commercial and Industrial [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with No Allowance: Recorded Investment |  | 3
Impaired Loans with No Allowance: Unpaid Principal Balance |  | 68
Commercial Portfolio [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with No Allowance: Recorded Investment | 8,215 | 7,973
Impaired Loans with No Allowance: Unpaid Principal Balance | 8,574 | 8,366
Impaired Loans with Allowance: Recorded Investment | 887 | 338
Impaired Loans with Allowance: Unpaid Principal Balance | 994 | 380
Impaired Loans with Allowance: Related Allowance | 274 | 166
Impaired Loans: Total Recorded Investment | 10,521 | 9,734
Impaired Loans: Total Unpaid Principal Balance | 11,261 | 10,454
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 | 1,419 | 1,423
Impaired Loans with No Allowance: Unpaid Principal Balance | 1,693 | 1,708
Commercial Portfolio [Member] | Commercial Real Estate - Construction [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with No Allowance: Recorded Investment | 31 | 40
Impaired Loans with No Allowance: Unpaid Principal Balance | 34 | 61
Impaired Loans: Total Recorded Investment | 31 | 40
Impaired Loans: Total Unpaid Principal Balance | 34 | 61
Residential Portfolio [Member] | Residential Mortgage [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with No Allowance: Recorded Investment | 818 | 817
Impaired Loans with No Allowance: Unpaid Principal Balance | 842 | 838
Impaired Loans: Total Recorded Investment | 1,141 | 1,198
Impaired Loans: Total Unpaid Principal Balance | 1,410 | 1,416
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 | 323 | 381
Impaired Loans with No Allowance: Unpaid Principal Balance | $ 568 | $ 578

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