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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, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Home Equity [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Impaired Loans with No Allowance: Average Recorded Investment | $ 294 | $ 62 | $ 184 | $ 59
Impaired Loans with No Allowance: Interest Income Recognized | 3 |  | 5 |
Impaired Loans with Allowance: Average Recorded Investment |  | 31 |  | 33
Impaired Financing Receivable, Average Recorded Investment, Total | 294 | 93 | 184 | 92
Impaired Financing Receivable, Interest Income Recognized, Total | 3 |  | 5 |
Commercial Portfolio [Member] | Commercial and Industrial [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Impaired Loans with No Allowance: Average Recorded Investment |  | 8 | 16 | 12
Impaired Loans with Allowance: Average Recorded Investment | 2,230 | 469 | 892 | 224
Impaired Financing Receivable, Average Recorded Investment, Total | 2,230 | 477 | 908 | 236
Commercial Portfolio [Member] | Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Impaired Loans with No Allowance: Average Recorded Investment | 751 | 797 | 551 | 865
Impaired Loans with No Allowance: Interest Income Recognized |  |  | 279 |
Impaired Loans with Allowance: Average Recorded Investment | 2,148 | 2,643 | 2,446 | 2,036
Impaired Financing Receivable, Average Recorded Investment, Total | 2,899 | 4,405 | 2,997 | 3,845
Impaired Financing Receivable, Interest Income Recognized, Total |  |  | 389 |
Commercial Portfolio [Member] | Commercial Real Estate [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Impaired Loans with No Allowance: Average Recorded Investment |  | 965 |  | 944
Impaired Loans with No Allowance: Interest Income Recognized |  |  | 110 |
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 | 487 |  | 390 |
Impaired Financing Receivable, Average Recorded Investment, Total | 529 |  | 554 |
Residential Portfolio [Member] | Residential Mortgage [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Impaired Loans with No Allowance: Average Recorded Investment | 847 | 834 | 852 | 802
Impaired Loans with No Allowance: Interest Income Recognized |  | 6 | 18 | 15
Impaired Loans with Allowance: Average Recorded Investment | 66 |  | 53 |
Impaired Financing Receivable, Average Recorded Investment, Total | $ 913 | 1,210 | 905 | 1,177
Impaired Financing Receivable, Interest Income Recognized, Total |  | 6 | $ 18 | 19
Residential Portfolio [Member] | Residential Mortgage [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Impaired Loans with No Allowance: Average Recorded Investment |  | $ 376 |  | 375
Impaired Loans with No Allowance: Interest Income Recognized |  |  |  | $ 4

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