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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Home Equity [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Loans with No Allowance: Average Recorded Investment | $ 27 | $ 101 | $ 218
Impaired Loans with No Allowance: Interest Income Recognized |  |  | 6
Impaired Financing Receivable, Average Recorded Investment, Total | 31 | 102 | 218
Impaired Financing Receivable, Interest Income Recognized, Total |  |  | 6
Home Equity [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Loans with No Allowance: Average Recorded Investment | 4 | 1 |
Commercial Portfolio [Member] | Commercial and Industrial [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Loans with No Allowance: Average Recorded Investment | 178 |  | 15
Impaired Loans with No Allowance: Interest Income Recognized | 3 |  |
Impaired Loans with Allowance: Average Recorded Investment | 962 | 4,437 | 1,779
Impaired Financing Receivable, Average Recorded Investment, Total | 1,158 | 4,460 | 1,794
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 | 18 | 23 |
Commercial Portfolio [Member] | Commercial Real Estate [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Loans with No Allowance: Average Recorded Investment | 3,363 | 3,048 | 1,915
Impaired Loans with No Allowance: Interest Income Recognized | 20 | 3 | 279
Impaired Loans with Allowance: Average Recorded Investment | 424 | 541 | 1,446
Impaired Financing Receivable, Average Recorded Investment, Total | 5,384 | 5,003 | 4,012
Impaired Financing Receivable, Interest Income Recognized, Total | 20 | 26 | 389
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 | 1,597 | 1,414 | 651
Impaired Loans with No Allowance: Interest Income Recognized |  | 23 | 110
Commercial Portfolio [Member] | Commercial Real Estate - Construction [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Loans with No Allowance: Average Recorded Investment | 32 |  | 164
Impaired Loans with Allowance: Average Recorded Investment | 147 | 367 | 488
Impaired Financing Receivable, Average Recorded Investment, Total | 179 | 367 | 652
Residential Portfolio [Member] | Residential Mortgage [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Loans with No Allowance: Average Recorded Investment | 854 | 754 | 890
Impaired Loans with No Allowance: Interest Income Recognized | 30 | 29 | 18
Impaired Financing Receivable, Average Recorded Investment, Total | 1,845 | 1,586 | 1,222
Impaired Financing Receivable, Interest Income Recognized, Total | 30 | 29 | 18
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 | $ 991 | $ 832 | $ 332

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