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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, 2021 | Mar. 31, 2020
Home Equity [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with No Allowance: Average Recorded Investment | $ 2,350 | $ 24
Impaired Financing Receivable, Average Recorded Investment, Total | 2,350 | 25
Home Equity [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with No Allowance: Average Recorded Investment |  | 1
Commercial Portfolio [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with No Allowance: Average Recorded Investment | 753 | 890
Impaired Loans with Allowance: Average Recorded Investment | 157 | 4
Impaired Financing Receivable, Average Recorded Investment, Total | 910 | 896
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
Commercial Portfolio [Member] | Commercial Real Estate - Construction [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with No Allowance: Average Recorded Investment | 31 | 40
Impaired Financing Receivable, Average Recorded Investment, Total | 31 | 40
Commercial Portfolio [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with No Allowance: Average Recorded Investment | 4,405 | 7,430
Impaired Loans with Allowance: Average Recorded Investment | 880 | 550
Impaired Financing Receivable, Average Recorded Investment, Total | 6,699 | 9,400
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 | 1,414 | 1,420
Residential Portfolio [Member] | Residential Mortgage [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with No Allowance: Average Recorded Investment | 787 | 782
Impaired Loans with No Allowance: Interest Income Recognized | 8 | 6
Impaired Financing Receivable, Average Recorded Investment, Total | 1,104 | 1,156
Impaired Financing Receivable, Interest Income Recognized, Total | 8 | 6
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 | $ 317 | $ 374

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