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Loans and Allowance for Loan and Lease Losses (Impaired Loans by Loan Portfolio Class) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Home Equity [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with No Allowance: Recorded Investment | $ 2,386 | $ 25
Impaired Loans with No Allowance: Unpaid Principal Balance | 2,417 | 27
Impaired Loans: Total Recorded Investment | 2,386 | 26
Impaired Loans: Total Unpaid Principal Balance | 2,431 | 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 | 14 | 5
Commercial Portfolio [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with No Allowance: Recorded Investment | 859 | 890
Impaired Loans with No Allowance: Unpaid Principal Balance | 891 | 890
Impaired Loans with Allowance: Recorded Investment | 53 |
Impaired Loans with Allowance: Unpaid Principal Balance | 73 |
Impaired Loans with Allowance: Related Allowance | 41 |
Impaired Loans: Total Recorded Investment | 912 | 893
Impaired Loans: Total Unpaid Principal Balance | 964 | 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 | 7,074 | 7,973
Impaired Loans with No Allowance: Unpaid Principal Balance | 7,425 | 8,366
Impaired Loans with Allowance: Recorded Investment | 360 | 338
Impaired Loans with Allowance: Unpaid Principal Balance | 405 | 380
Impaired Loans with Allowance: Related Allowance | 141 | 166
Impaired Loans: Total Recorded Investment | 8,860 | 9,734
Impaired Loans: Total Unpaid Principal Balance | 9,528 | 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 | 1,426 | 1,423
Impaired Loans with No Allowance: Unpaid Principal Balance | 1,698 | 1,708
Commercial Portfolio [Member] | Commercial Real Estate - Construction [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with No Allowance: Recorded Investment | 32 | 40
Impaired Loans with No Allowance: Unpaid Principal Balance | 34 | 61
Impaired Loans: Total Recorded Investment | 32 | 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 | 834 | 817
Impaired Loans with No Allowance: Unpaid Principal Balance | 859 | 838
Impaired Loans: Total Recorded Investment | 1,176 | 1,198
Impaired Loans: Total Unpaid Principal Balance | 1,444 | 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 | 342 | 381
Impaired Loans with No Allowance: Unpaid Principal Balance | $ 585 | $ 578

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