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Loans and Allowance for Loan and Lease Losses (Impaired Loans by Loan Portfolio Class) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Home Equity [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with No Allowance: Recorded Investment | $ 25 | $ 30
Impaired Loans with No Allowance: Unpaid Principal Balance | 27 | 106
Impaired Loans: Total Recorded Investment | 26 | 34
Impaired Loans: Total Unpaid Principal Balance | 32 | 110
Home Equity [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with No Allowance: Recorded Investment | 1 | 4
Impaired Loans with No Allowance: Unpaid Principal Balance | 5 | 4
Commercial Portfolio [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with No Allowance: Recorded Investment | 890 |
Impaired Loans with No Allowance: Unpaid Principal Balance | 890 |
Impaired Loans with Allowance: Recorded Investment |  | 4,527
Impaired Loans with Allowance: Unpaid Principal Balance |  | 4,635
Impaired Loans with Allowance: Related Allowance |  | 500
Impaired Loans: Total Recorded Investment | 893 | 4,555
Impaired Loans: Total Unpaid Principal Balance | 958 | 4,663
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 | 28
Impaired Loans with No Allowance: Unpaid Principal Balance | 68 | 28
Commercial Portfolio [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with No Allowance: Recorded Investment | 7,973 | 2,007
Impaired Loans with No Allowance: Unpaid Principal Balance | 8,366 | 2,276
Impaired Loans with Allowance: Recorded Investment | 338 | 721
Impaired Loans with Allowance: Unpaid Principal Balance | 380 | 721
Impaired Loans with Allowance: Related Allowance | 166 | 204
Impaired Loans: Total Recorded Investment | 9,734 | 4,291
Impaired Loans: Total Unpaid Principal Balance | 10,454 | 4,560
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 | 1,423 | 1,563
Impaired Loans with No Allowance: Unpaid Principal Balance | 1,708 | 1,563
Commercial Portfolio [Member] | Commercial Real Estate - Construction [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with No Allowance: Recorded Investment | 40 |
Impaired Loans with No Allowance: Unpaid Principal Balance | 61 |
Impaired Loans with Allowance: Recorded Investment |  | 367
Impaired Loans with Allowance: Unpaid Principal Balance |  | 370
Impaired Loans with Allowance: Related Allowance |  | 38
Impaired Loans: Total Recorded Investment | 40 | 367
Impaired Loans: Total Unpaid Principal Balance | 61 | 370
Residential Portfolio [Member] | Residential Mortgage [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with No Allowance: Recorded Investment | 817 | 657
Impaired Loans with No Allowance: Unpaid Principal Balance | 838 | 811
Impaired Loans: Total Recorded Investment | 1,198 | 1,865
Impaired Loans: Total Unpaid Principal Balance | 1,416 | 2,019
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 | 381 | 1,208
Impaired Loans with No Allowance: Unpaid Principal Balance | $ 578 | $ 1,208

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