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Loans and Allowance for Loan and Lease Losses (Narrative) (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 USD ($) Loan | Sep. 30, 2017 USD ($) Loan | Sep. 30, 2018 USD ($) Loan | Sep. 30, 2017 USD ($) Loan | Dec. 31, 2017 USD ($) Loan
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Contractual payment of principal or interest past due period for discontinuing accrual of interest |  |  | 90 days |  |
Financing Receivable Deferred Fees And Costs | $ 443,000 |  | $ 443,000 |  | $ 464,000
Past Due | 7,696,000 |  | 7,696,000 |  | 10,749,000
Financing Receivable, Modifications, Recorded Investment | 7,056,000 |  | 7,056,000 |  | 9,571,000
Charge-offs associated with troubled debt restructured loans | $ 0 | $ 0 | $ 0 | $ 0 | $ 66,000
Number of troubled debt restructured loans, defaulted | Loan | 0 | 0 | 0 | 0 | 0
Number of troubled debt restructured loans | Loan | 0 | 0 | 0 | 0 |
Number of additional troubled debt restructured loans | Loan |  | 2 |  | 2 |
Financing Receivable, Modifications, Pre-Modification Recorded Investment |  |  | $ 7,741,000 |  | $ 10,536,000
Financing Receivable, Modifications, Post-Modification Recorded Investment |  |  | 7,990,000 |  | 10,730,000
Other Real Estate | $ 1,027,000 |  | $ 1,027,000 |  | 42,000
Number of consumer mortgage loans foreclosure proceedings in process | Loan |  |  | 4 |  |
Loans for which formal foreclosure proceedings are in process | 193,000 |  | $ 193,000 |  | 308,000
Home Equity Loan [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | $ 2,000 |  | 2,000 |  | 4,000
Financing Receivable, Modifications, Pre-Modification Recorded Investment |  |  | 14,000 |  | 14,000
Financing Receivable, Modifications, Post-Modification Recorded Investment |  |  | $ 14,000 |  | 14,000
Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Number of troubled debt restructured loans | Loan | 1 |  | 1 |  |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Past Due | $ 6,483,000 |  | $ 6,483,000 |  | 4,831,000
Accruing [Member] | Four Loans [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 524,000 |  | 524,000 |  | 544,000
Accruing [Member] | Home Equity Loan [Member] | Other Borrower |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 2,000 |  | 2,000 |  | 4,000
Accruing [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Past Due | 0 |  | 0 |  | 0
Nonaccruing [Member] | Nine Loans With Five Relationships [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 6,532,000 |  | 6,532,000 |  |
Nonaccruing [Member] | Two Large Relationships [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 5,463,000 |  | 5,463,000 |  | 7,284,000
Nonaccruing [Member] | Fifteen Loans With Five Relationships |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 6,532,000 |  | 6,532,000 |  |
Nonaccruing [Member] | Fifteen Loans With Seven Relationships [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment |  |  |  |  | 9,027,000
Nonaccruing [Member] | Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 270,000 | $ 4,460,000 | 270,000 | $ 4,460,000 |
Pre-modification and post-modification recorded investment balances |  |  | 270,000 |  |
Charge-offs associated with troubled debt restructured loans at the time of modification |  |  | 0 | $ 0 |
Number of existing troubled debt restructured loans | Loan |  |  |  | 4 |
Financing Receivable, Modifications, Pre-Modification Recorded Investment |  |  |  | $ 4,110,000 |
Financing Receivable, Modifications, Post-Modification Recorded Investment |  |  |  | 4,460,000 |
Financing receivable, other obligations |  | 350,000 |  | 350,000 |
Nonaccruing [Member] | Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment |  | $ 299,000 |  | $ 299,000 |
Number of existing troubled debt restructured loans | Loan |  |  |  | 2 |
Financing Receivable, Modifications, Pre-Modification Recorded Investment |  |  |  | $ 362,000 |
Financing Receivable, Modifications, Post-Modification Recorded Investment |  |  |  | $ 300,000 |
Reserve for Off-balance Sheet Activities [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Valuation Allowances and Reserves, Balance | $ 171,000 |  | $ 171,000 |  | 105,000
Maximum [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Non-residential consumer loans charged off on contractual basis in event of bankruptcy, in period |  |  | 120 days |  |
Maximum [Member] | Home equity lines of credit [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Loan Terms |  |  | 20 years |  |
Loan To Value Ratio | 85.00% |  | 85.00% |  |
Maximum [Member] | Home Equity Lines Of Credit [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Loan Terms |  |  | 5 years |  |
Commercial [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Loan Terms |  |  | 1 year |  |
Loan To Value Ratio | 80.00% |  | 80.00% |  |
Commercial [Member] | Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | $ 4,303,000 |  | $ 4,303,000 |  | 4,434,000
Financing Receivable, Modifications, Pre-Modification Recorded Investment |  |  | 4,110,000 |  | 4,110,000
Financing Receivable, Modifications, Post-Modification Recorded Investment |  |  | 4,460,000 |  | 4,460,000
Commercial [Member] | Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 2,229,000 |  | 2,229,000 |  | 4,593,000
Financing Receivable, Modifications, Pre-Modification Recorded Investment |  |  | 2,940,000 |  | 5,735,000
Financing Receivable, Modifications, Post-Modification Recorded Investment |  |  | 2,841,000 |  | 5,581,000
Residential Portfolio [Member] | Residential Mortgage [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | 522,000 |  | 522,000 |  | 540,000
Financing Receivable, Modifications, Pre-Modification Recorded Investment |  |  | 677,000 |  | 677,000
Financing Receivable, Modifications, Post-Modification Recorded Investment |  |  | 675,000 |  | 675,000
Residential Portfolio [Member] | Residential Mortgage [Member] | Accruing [Member] | Three Unrelated Borrowers |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Recorded Investment | $ 522,000 |  | $ 522,000 |  | $ 540,000
Residential Portfolio [Member] | Maximum [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Loan Terms |  |  | 30 years |  |
Loan To Value Ratio | 100.00% |  | 100.00% |  |
Loan To Value Ratio, Exposure After Private Mortgage Insurance |  |  | 85.00% |  |

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