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Loans and Allowance for Loan and Lease Losses (Average Recorded Investment Of Impaired Loans And Related Interest Income By Loan Portfolio Class) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Home Equity [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with No Allowance: Average Recorded Investment | $ 24 | $ 30
Impaired Financing Receivable, Average Recorded Investment, Total | 25 | 34
Home Equity [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with No Allowance: Average Recorded Investment | 1 | 4
Commercial Portfolio [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with No Allowance: Average Recorded Investment | 890 |
Impaired Loans with Allowance: Average Recorded Investment | 4 | 2,366
Impaired Loans with Allowance: Interest Income Recognized |  | 3
Impaired Financing Receivable, Average Recorded Investment, Total | 896 | 2,395
Impaired Financing Receivable, Interest Income Recognized, Total |  | 3
Commercial Portfolio [Member] | Commercial and Industrial [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with No Allowance: Average Recorded Investment | 2 | 29
Commercial Portfolio [Member] | Commercial Real Estate - Construction [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with No Allowance: Average Recorded Investment | 40 |
Impaired Loans with Allowance: Average Recorded Investment |  | 367
Impaired Financing Receivable, Average Recorded Investment, Total | 40 | 367
Commercial Portfolio [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with No Allowance: Average Recorded Investment | 7,430 | 2,001
Impaired Loans with Allowance: Average Recorded Investment | 550 | 776
Impaired Financing Receivable, Average Recorded Investment, Total | 9,400 | 4,352
Commercial Portfolio [Member] | Commercial Real Estate [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with No Allowance: Average Recorded Investment | 1,420 | 1,575
Residential Portfolio [Member] | Residential Mortgage [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with No Allowance: Average Recorded Investment | 782 | 858
Impaired Loans with No Allowance: Interest Income Recognized | 6 | 7
Impaired Financing Receivable, Average Recorded Investment, Total | 1,156 | 2,072
Impaired Financing Receivable, Interest Income Recognized, Total | 6 | 7
Residential Portfolio [Member] | Residential Mortgage [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with No Allowance: Average Recorded Investment | $ 374 | $ 1,214

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