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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Home Equity [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Impaired Loans with No Allowance: Average Recorded Investment | $ 95 | $ 90 | $ 208 | $ 101
Impaired Loans with No Allowance: Interest Income Recognized |  |  |  | 2
Impaired Financing Receivable, Average Recorded Investment, Total | 95 | 90 | 208 | 101
Impaired Financing Receivable, Interest Income Recognized, Total |  |  |  | 2
Commercial Portfolio [Member] | Commercial and Industrial [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Impaired Loans with No Allowance: Average Recorded Investment |  | 36 |  | 18
Impaired Loans with Allowance: Average Recorded Investment | 4,349 |  | 3,519 |
Impaired Financing Receivable, Average Recorded Investment, Total | 4,372 | 36 | 3,539 | 18
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 | 23 |  | 20 |
Commercial Portfolio [Member] | Commercial Real Estate - Construction [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Impaired Loans with No Allowance: Average Recorded Investment |  | 473 | 17 | 313
Impaired Loans with Allowance: Average Recorded Investment | 367 | 240 | 366 | 144
Impaired Financing Receivable, Average Recorded Investment, Total | 367 | 1,039 | 383 | 457
Impaired Financing Receivable, Interest Income Recognized, Total |  | 2 |  |
Commercial Portfolio [Member] | Commercial Real Estate - Construction [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Impaired Loans with No Allowance: Average Recorded Investment |  | 326 |  |
Impaired Loans with No Allowance: Interest Income Recognized |  | 2 |  |
Commercial Portfolio [Member] | Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Impaired Loans with No Allowance: Average Recorded Investment | 2,650 | 644 | 2,306 | 524
Impaired Loans with No Allowance: Interest Income Recognized | 3 | 110 | 3 | 279
Impaired Loans with Allowance: Average Recorded Investment | 1,029 | 2,792 | 1,367 | 2,660
Impaired Financing Receivable, Average Recorded Investment, Total | 5,134 | 4,080 | 5,674 | 3,922
Impaired Financing Receivable, Interest Income Recognized, Total | 10 | 220 | 17 | 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 | 1,455 | 644 | 2,001 | 738
Impaired Loans with No Allowance: Interest Income Recognized | 7 | 110 | 14 | 110
Residential Portfolio [Member] | Residential Mortgage [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Impaired Loans with No Allowance: Average Recorded Investment | 699 | 860 | 796 | 843
Impaired Loans with No Allowance: Interest Income Recognized | 7 | 7 | 14 | 18
Impaired Loans with Allowance: Average Recorded Investment |  | 66 |  | 40
Impaired Financing Receivable, Average Recorded Investment, Total | 1,338 | 926 | 1,882 | 1,233
Impaired Financing Receivable, Interest Income Recognized, Total | 7 | $ 7 | 14 | 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 | $ 639 |  | $ 1,086 | $ 350

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