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Loans and Allowance for Loan and Lease Losses (Narrative) (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 USD ($) Loan | Mar. 31, 2017 USD ($) 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 | $ 515,000 |  | $ 464,000
Past Due | 9,890,000 |  | 10,749,000
Financing Receivable, Modifications, Recorded Investment | 9,446,000 |  | 9,571,000
Charge-offs associated with troubled debt restructured loans | $ 0 | $ 0 | $ 66,000
Number of troubled debt restructured loans, defaulted | Loan | 0 | 0 | 0
Number of troubled debt restructured loans | Loan | 0 | 0 |
Other Real Estate | $ 734,000 |  | $ 42,000
Number of consumer mortgage loans foreclosure proceedings in process | Loan | 5 |  |
Loans for which formal foreclosure proceedings are in process | $ 415,000 |  | 308,000
Home Equity Loan [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Financing Receivable, Modifications, Recorded Investment | 3,000 |  |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Past Due | 3,593,000 |  | 4,831,000
Accruing [Member] | Four Loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Financing Receivable, Modifications, Recorded Investment |  |  | 544,000
Accruing [Member] | One Loan [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Financing Receivable, Modifications, Recorded Investment | 490,000 |  |
Accruing [Member] | Home Equity Loan [Member] | Other Borrower |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Financing Receivable, Modifications, Recorded Investment |  |  | 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
Nonaccruing [Member] | Fifteen Loans With Five Relationships [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Financing Receivable, Modifications, Recorded Investment | 8,909,000 |  |
Nonaccruing [Member] | Two Large Relationships [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Financing Receivable, Modifications, Recorded Investment | 7,224,000 |  | 7,284,000
Nonaccruing [Member] | Fifteen Loans With Seven Relationships [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Financing Receivable, Modifications, Recorded Investment |  |  | 9,027,000
Reserve for Off-balance Sheet Activities [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Valuation Allowances and Reserves, Balance | $ 107,000 |  | 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% |  |
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% |  |
Residential Portfolio [Member] | Residential Mortgage [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Financing Receivable, Modifications, Recorded Investment | $ 534,000 |  | 544,000
Residential Portfolio [Member] | Residential Mortgage [Member] | Accruing [Member] | Four Loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Financing Receivable, Modifications, Recorded Investment | $ 537,000 |  |
Residential Portfolio [Member] | Residential Mortgage [Member] | Accruing [Member] | Three Unrelated Borrowers |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Financing Receivable, Modifications, Recorded Investment |  |  | $ 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% |  |
Loan To Value Ratio, Exposure After Private Mortgage Insurance | 85.00% |  |

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