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Loans and Allowance for Loan and Lease Losses (Impaired Loans by Loan Portfolio Class) (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Home Equity [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with No Allowance: Recorded Investment | $ 183 | $ 260
Impaired Loans with No Allowance: Unpaid Principal Balance | 294 | 295
Impaired Loans: Total Recorded Investment | 183 | 260
Impaired Loans: Total Unpaid Principal Balance | 294 | 295
Commercial Portfolio [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with No Allowance: Unpaid Principal Balance | 12 | 13
Impaired Loans with Allowance: Recorded Investment | 4,374 | 4,434
Impaired Loans with Allowance: Unpaid Principal Balance | 4,460 | 4,460
Impaired Loans with Allowance: Related Allowance | 265 | 136
Impaired Loans: Total Recorded Investment | 4,397 | 4,434
Impaired Loans: Total Unpaid Principal Balance | 4,495 | 4,473
Commercial Portfolio [Member] | Commercial and Industrial [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with No Allowance: Recorded Investment | 23 |
Impaired Loans with No Allowance: Unpaid Principal Balance | 23 |
Commercial Portfolio [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with No Allowance: Recorded Investment | 3,588 | 3,424
Impaired Loans with No Allowance: Unpaid Principal Balance | 4,233 | 4,056
Impaired Loans with Allowance: Recorded Investment | 1,389 | 1,423
Impaired Loans with Allowance: Unpaid Principal Balance | 1,577 | 1,589
Impaired Loans with Allowance: Related Allowance | 281 | 293
Impaired Loans: Total Recorded Investment | 6,420 | 5,402
Impaired Loans: Total Unpaid Principal Balance | 7,253 | 6,200
Commercial Portfolio [Member] | Commercial Real Estate [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with No Allowance: Recorded Investment | 1,443 | 555
Impaired Loans with No Allowance: Unpaid Principal Balance | 1,443 | 555
Commercial Portfolio [Member] | Commercial Real Estate - Construction [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with Allowance: Recorded Investment | 487 | 487
Impaired Loans with Allowance: Unpaid Principal Balance | 492 | 492
Impaired Loans with Allowance: Related Allowance | 93 | 100
Impaired Loans: Total Recorded Investment | 487 | 487
Impaired Loans: Total Unpaid Principal Balance | 492 | 492
Residential Portfolio [Member] | Residential Mortgage [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with No Allowance: Recorded Investment | 669 | 760
Impaired Loans with No Allowance: Unpaid Principal Balance | 790 | 877
Impaired Loans: Total Recorded Investment | 1,358 | 1,066
Impaired Loans: Total Unpaid Principal Balance | 1,479 | 1,183
Residential Portfolio [Member] | Residential Mortgage [Member] | Receivables Acquired with Deteriorated Credit Quality [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with No Allowance: Recorded Investment | 689 | 306
Impaired Loans with No Allowance: Unpaid Principal Balance | $ 689 | $ 306

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