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Loans and Allowance for Loan and Lease Losses (Impaired Loans by Loan Portfolio Class) (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Home Equity [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with No Allowance: Recorded Investment | $ 261 | $ 111
Impaired Loans with No Allowance: Unpaid Principal Balance | 296 | 129
Impaired Loans with Allowance: Recorded Investment |  | 29
Impaired Loans with Allowance: Unpaid Principal Balance |  | 49
Impaired Loans with Allowance: Related Allowance |  | 1
Impaired Loans: Total Recorded Investment | 261 | 140
Impaired Loans: Total Unpaid Principal Balance | 296 | 178
Commercial Portfolio [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with No Allowance: Recorded Investment |  | 4
Impaired Loans with No Allowance: Unpaid Principal Balance | 15 | 9
Impaired Loans with Allowance: Recorded Investment | 4,460 | 56
Impaired Loans with Allowance: Unpaid Principal Balance | 4,460 | 62
Impaired Loans with Allowance: Related Allowance | 150 | 6
Impaired Loans: Total Recorded Investment | 4,460 | 60
Impaired Loans: Total Unpaid Principal Balance | 4,475 | 71
Commercial Portfolio [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with No Allowance: Recorded Investment | 603 | 726
Impaired Loans with No Allowance: Unpaid Principal Balance | 1,288 | 1,792
Impaired Loans with Allowance: Recorded Investment | 1,545 | 2,520
Impaired Loans with Allowance: Unpaid Principal Balance | 1,691 | 2,646
Impaired Loans with Allowance: Related Allowance | 375 | 711
Impaired Loans: Total Recorded Investment | 2,717 | 4,088
Impaired Loans: Total Unpaid Principal Balance | 3,548 | 5,280
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 | 569 | 842
Impaired Loans with No Allowance: Unpaid Principal Balance | 569 | 842
Commercial Portfolio [Member] | Commercial Real Estate - Construction [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with No Allowance: Recorded Investment |  | 618
Impaired Loans with No Allowance: Unpaid Principal Balance |  | 618
Impaired Loans with Allowance: Recorded Investment | 487 | 242
Impaired Loans with Allowance: Unpaid Principal Balance | 492 | 242
Impaired Loans with Allowance: Related Allowance | 100 | 72
Impaired Loans: Total Recorded Investment | 487 | 860
Impaired Loans: Total Unpaid Principal Balance | 492 | 860
Residential Portfolio [Member] | Residential Mortgage [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired Loans with No Allowance: Recorded Investment | 790 | 848
Impaired Loans with No Allowance: Unpaid Principal Balance | 826 | 882
Impaired Loans with Allowance: Recorded Investment | 66 | 68
Impaired Loans with Allowance: Unpaid Principal Balance | 68 | 68
Impaired Loans with Allowance: Related Allowance | 66 | 68
Impaired Loans: Total Recorded Investment | 1,171 | 1,305
Impaired Loans: Total Unpaid Principal Balance | 1,209 | 1,339
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 | 315 | 389
Impaired Loans with No Allowance: Unpaid Principal Balance | $ 315 | $ 389

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- Definition Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953550-111524 + Details
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