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Loans and Allowance for Loan and Lease Losses (Impaired Loans by Loan Portfolio Class) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Home Equity [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with No Allowance: Recorded Investment | $ 25 | $ 260
Impaired Loans with No Allowance: Unpaid Principal Balance | 126 | 295
Impaired Loans: Total Recorded Investment | 29 | 260
Impaired Loans: Total Unpaid Principal Balance | 130 | 295
Home Equity [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with No Allowance: Recorded Investment | 4 |
Impaired Loans with No Allowance: Unpaid Principal Balance | 4 |
Commercial Portfolio [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with No Allowance: Unpaid Principal Balance |  | 13
Impaired Loans with Allowance: Recorded Investment | 4,527 | 4,434
Impaired Loans with Allowance: Unpaid Principal Balance | 4,635 | 4,460
Impaired Loans with Allowance: Related Allowance | 489 | 136
Impaired Loans: Total Recorded Investment | 4,555 | 4,434
Impaired Loans: Total Unpaid Principal Balance | 4,663 | 4,473
Commercial Portfolio [Member] | Commercial and Industrial [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with No Allowance: Recorded Investment | 28 |
Impaired Loans with No Allowance: Unpaid Principal Balance | 28 |
Commercial Portfolio [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with No Allowance: Recorded Investment | 2,033 | 3,424
Impaired Loans with No Allowance: Unpaid Principal Balance | 2,553 | 4,056
Impaired Loans with Allowance: Recorded Investment | 857 | 1,423
Impaired Loans with Allowance: Unpaid Principal Balance | 872 | 1,589
Impaired Loans with Allowance: Related Allowance | 243 | 293
Impaired Loans: Total Recorded Investment | 4,346 | 5,402
Impaired Loans: Total Unpaid Principal Balance | 4,881 | 6,200
Commercial Portfolio [Member] | Commercial Real Estate [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with No Allowance: Recorded Investment | 1,456 | 555
Impaired Loans with No Allowance: Unpaid Principal Balance | 1,456 | 555
Commercial Portfolio [Member] | Commercial Real Estate - Construction [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with Allowance: Recorded Investment | 367 | 487
Impaired Loans with Allowance: Unpaid Principal Balance | 370 | 492
Impaired Loans with Allowance: Related Allowance | 38 | 100
Impaired Loans: Total Recorded Investment | 367 | 487
Impaired Loans: Total Unpaid Principal Balance | 370 | 492
Residential Portfolio [Member] | Residential Mortgage [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with No Allowance: Recorded Investment | 832 | 760
Impaired Loans with No Allowance: Unpaid Principal Balance | 940 | 877
Impaired Loans: Total Recorded Investment | 2,096 | 1,066
Impaired Loans: Total Unpaid Principal Balance | 2,204 | 1,183
Residential Portfolio [Member] | Residential Mortgage [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with No Allowance: Recorded Investment | 1,264 | 306
Impaired Loans with No Allowance: Unpaid Principal Balance | $ 1,264 | $ 306

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