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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, 2019 USD ($) Loan | Sep. 30, 2018 USD ($) Loan | Sep. 30, 2019 USD ($) Loan | Sep. 30, 2018 USD ($) Loan | Dec. 31, 2018 USD ($) Loan
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Financing receivable deferred fees and costs | $ 948,000 |  | $ 948,000 |  | $ 647,000
Financing receivable, modifications, recorded investment | $ 2,391,000 |  | $ 2,391,000 |  | $ 7,020,000
Number of troubled debt restructured loans | Loan | 0 | 0 | 0 | 0 | 0
Charge-offs associated with troubled debt restructured loans | $ 0 | $ 0 | $ 0 | $ 0 |
Number of troubled debt restructured loans, defaulted | Loan | 0 | 0 | 0 | 0 |
Accruing [Member] | Four Loans [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Financing receivable, modifications, recorded investment |  |  |  |  | $ 517,000
Nonaccruing [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Financing receivable, modifications, recorded investment | $ 4,572,000 |  | $ 4,572,000 |  |
Nonaccruing [Member] | Fifteen Loans With Seven Relationships [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Financing receivable, modifications, recorded investment | 1,894,000 |  | 1,894,000 |  | 6,503,000
Nonaccruing [Member] | One Large Relationships [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Financing receivable, modifications, recorded investment | 1,423,000 |  | 1,423,000 |  | 5,463,000
Residential Mortgage [Member] | Residential Portfolio [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Financing receivable, modifications, recorded investment | 497,000 |  | 497,000 |  | 516,000
Residential Mortgage [Member] | Residential Portfolio [Member] | Accruing [Member] | Three Unrelated Borrowers [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Financing receivable, modifications, recorded investment | $ 497,000 |  | $ 497,000 |  | 516,000
Home Equity Loan [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Financing receivable, modifications, recorded investment |  |  |  |  | 1,000
Home Equity Loan [Member] | Accruing [Member] | Other Borrower [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Financing receivable, modifications, recorded investment |  |  |  |  | 1,000
Commercial and Industrial [Member] | Commercial Portfolio [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |
Financing receivable, modifications, recorded investment |  |  |  |  | $ 4,302,000
Number of troubled debt restructured loans | Loan |  |  | 2 |  |

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