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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 | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Home Equity [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Loans with No Allowance: Average Recorded Investment | $ 1,801 | $ 27 | $ 101
Impaired Financing Receivable, Average Recorded Investment, Total | 1,802 | 31 | 102
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 | 1
Commercial Portfolio [Member] | Commercial and Industrial [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Loans with No Allowance: Average Recorded Investment | 1,136 | 178 |
Impaired Loans with No Allowance: Interest Income Recognized |  | 3 |
Impaired Loans with Allowance: Average Recorded Investment | 205 | 962 | 4,437
Impaired Financing Receivable, Average Recorded Investment, Total | 1,342 | 1,158 | 4,460
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 | 1 | 18 | 23
Commercial Portfolio [Member] | Commercial Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Loans with No Allowance: Average Recorded Investment | 9,379 | 3,363 | 3,048
Impaired Loans with No Allowance: Interest Income Recognized | 5 | 20 | 3
Impaired Loans with Allowance: Average Recorded Investment | 752 | 424 | 541
Impaired Financing Receivable, Average Recorded Investment, Total | 11,554 | 5,384 | 5,003
Impaired Financing Receivable, Interest Income Recognized, Total | 5 | 20 | 26
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 | 1,423 | 1,597 | 1,414
Impaired Loans with No Allowance: Interest Income Recognized |  |  | 23
Commercial Portfolio [Member] | Commercial Real Estate - Construction [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Loans with No Allowance: Average Recorded Investment | 44 | 32 |
Impaired Loans with Allowance: Average Recorded Investment |  | 147 | 367
Impaired Financing Receivable, Average Recorded Investment, Total | 44 | 179 | 367
Residential Portfolio [Member] | Residential Mortgage [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Loans with No Allowance: Average Recorded Investment | 998 | 854 | 754
Impaired Loans with No Allowance: Interest Income Recognized | 26 | 30 | 29
Impaired Financing Receivable, Average Recorded Investment, Total | 1,359 | 1,845 | 1,586
Impaired Financing Receivable, Interest Income Recognized, Total | 26 | 30 | 29
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 | $ 361 | $ 991 | $ 832

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