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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Home Equity [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Impaired Loans with No Allowance: Average Recorded Investment | $ 17 | $ 294 | $ 148 | $ 184
Impaired Loans with No Allowance: Interest Income Recognized |  | 3 |  | 5
Impaired Financing Receivable, Average Recorded Investment, Total | 18 | 294 | 148 | 184
Impaired Financing Receivable, Interest Income Recognized, Total |  | 3 |  | 5
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 |  |  |  | 16
Impaired Loans with Allowance: Average Recorded Investment | 4,425 | 2,230 | 4,424 | 892
Impaired Financing Receivable, Average Recorded Investment, Total | 4,449 | 2,230 | 4,445 | 908
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 | 24 |  | 21 |
Commercial Portfolio [Member] | Commercial Real Estate - Construction [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Impaired Loans with No Allowance: Average Recorded Investment |  | 42 |  | 164
Impaired Loans with Allowance: Average Recorded Investment | 367 | 487 | 367 | 390
Impaired Financing Receivable, Average Recorded Investment, Total | 367 | 529 | 367 | 554
Commercial Portfolio [Member] | Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Impaired Loans with No Allowance: Average Recorded Investment | 1,872 | 751 | 3,040 | 551
Impaired Loans with No Allowance: Interest Income Recognized |  |  | 3 | 279
Impaired Loans with Allowance: Average Recorded Investment | 703 | 2,148 | 456 | 2,446
Impaired Financing Receivable, Average Recorded Investment, Total | 4,045 | 3,469 | 4,861 | 3,679
Impaired Financing Receivable, Interest Income Recognized, Total | 7 |  | 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 | 1,470 | 570 | 1,365 | 682
Impaired Loans with No Allowance: Interest Income Recognized | 7 |  | 23 | 110
Residential Portfolio [Member] | Residential Mortgage [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Impaired Loans with No Allowance: Average Recorded Investment | 780 | 847 | 769 | 852
Impaired Loans with No Allowance: Interest Income Recognized | 11 |  | 27 | 18
Impaired Loans with Allowance: Average Recorded Investment |  | 66 |  | 53
Impaired Financing Receivable, Average Recorded Investment, Total | 1,457 | 1,231 | 1,495 | 1,244
Impaired Financing Receivable, Interest Income Recognized, Total | 11 |  | 27 | 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 | $ 677 | $ 318 | $ 726 | $ 339

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