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Loans and Allowance for Loan and Lease Losses (Narrative) (Details) | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 USD ($) Loan | Dec. 31, 2020 USD ($) Loan | Jun. 30, 2020 USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Financing receivable deferred fees and costs | $ 16,554,000 | $ 9,084,000 |
Allowance for loan losses | 14,716,000 | 13,382,000 |
Loans outstanding, net | 2,480,476,000 | 2,370,659,000 |
Financing receivable, modifications, recorded investment | $ 1,412,000 | $ 1,480,000 |
Number of troubled debt restructured loans | Loan | 0 | 0 |
Loans and leases receivable, gross, carrying amount | $ 2,495,192,000 | $ 2,384,041,000 | $ 2,445,765,000
CARES Act [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Loans and leases receivable, gross, carrying amount | $ 314,000 | $ 11,681,000 |
CARES Act [Member] | Maximum [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Qualifying deferment status percentage of loan portfolio | 1.00% | 1.00% |
Nonaccruing [Member] | Nine Loans With Seven Relationships [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Financing receivable, modifications, recorded investment | $ 963,000 | $ 1,017,000 |
Residential Portfolio [Member] | Residential Mortgage [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Financing receivable, modifications, recorded investment | 490,000 | 510,000 |
Loans and leases receivable, gross, carrying amount | 196,691,000 | 201,841,000 | $ 218,352,000
Residential Portfolio [Member] | Residential Mortgage [Member] | Accruing | Three Unrelated Borrowers [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Financing receivable, modifications, recorded investment | 449,000 | 463,000 |
Residential Portfolio [Member] | Residential Mortgage [Member] | Nonaccruing [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Financing receivable, modifications, recorded investment | 41,000 | 47,000 |
Residential Portfolio [Member] | Residential Mortgage [Member] | Nonaccruing [Member] | Nine Loans With Seven Relationships [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Financing receivable, modifications, recorded investment |  | 1,017,000 |
Residential Portfolio [Member] | Residential Mortgage [Member] | Nonaccruing [Member] | One Large Relationships [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Financing receivable, modifications, recorded investment |  | 535,000 |
Residential Portfolio [Member] | Residential Mortgage [Member] | Nonaccruing [Member] | Four Loans With Two Relationships [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Financing receivable, modifications, recorded investment |  | 398,000 |
Commercial Real Estate [Member] | Residential Mortgage [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Financing receivable, modifications, recorded investment |  | 31,000 |
PPP Loans [Member] | Small Business Administration [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses | 0 |  |
Loans outstanding, net | 391,826,000 | 388,313,000 |
Commercial Real Estate [Member] | Residential Portfolio [Member] | Residential Mortgage [Member] | Nonaccruing [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Financing receivable, modifications, recorded investment | 893,000 |  |
Commercial Real Estate - Construction [Member] | Residential Portfolio [Member] | Residential Mortgage [Member] | Nonaccruing [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Financing receivable, modifications, recorded investment | 23,000 |  |
Commercial and Industrial [Member] | Residential Portfolio [Member] | Residential Mortgage [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Financing receivable, modifications, recorded investment |  | $ 6,000 |
Commercial and Industrial [Member] | Residential Portfolio [Member] | Residential Mortgage [Member] | Nonaccruing [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Financing receivable, modifications, recorded investment | $ 6,000 |  |

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