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Loans and Allowance for Loan and Lease Losses (Narrative) (Details) | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2020 USD ($) Loan Borrower | Dec. 31, 2019 USD ($) Loan | Jun. 30, 2020 USD ($) | Sep. 30, 2019 USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Financing receivable deferred fees and costs | $ 16,536,000 | $ 1,081,000 |  |
Allowance for loan losses | 12,170,000 | 9,515,000 |  |
Loans outstanding, net | 2,509,657,000 | 1,753,241,000 |  |
Financing receivable, modifications, recorded investment | $ 928,000 | $ 2,238,000 |  |
Number of troubled debt restructured loans | Loan | 0 | 0 |  |
Loan modifications to number of borrowers affected by Covid | Borrower | 1,000 |  |  |
Loans and leases receivable, gross, carrying amount | $ 2,521,827,000 | $ 1,762,756,000 |  | $ 1,710,434,000
CARES Act [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Qualifying deferment status percentage of loan portfolio | 1.00% |  | 18.00% |
Loans and leases receivable, gross, carrying amount | $ 32,851,000 |  | $ 444,486,000 |
Nonaccruing [Member] | Seven Loans with Five Relationships [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Financing receivable, modifications, recorded investment | 458,000 |  |  |
Nonaccruing [Member] | Eight Loans with Five Relationships [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Financing receivable, modifications, recorded investment |  | 1,748,000 |  |
Nonaccruing [Member] | One Large Relationships [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Financing receivable, modifications, recorded investment |  | 1,252,000 |  |
Residential Portfolio [Member] | Residential Mortgage [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Financing receivable, modifications, recorded investment | 481,000 | 490,000 |  |
Loans and leases receivable, gross, carrying amount | 215,589,000 | 236,724,000 |  | $ 243,729,000
Residential Portfolio [Member] | Residential Mortgage [Member] | Accruing | Three Unrelated Borrowers [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Financing receivable, modifications, recorded investment | 470,000 | $ 490,000 |  |
Residential Portfolio [Member] | Residential Mortgage [Member] | Nonaccruing [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Financing receivable, modifications, recorded investment | 11,000 |  |  |
PPP Loans [Member] | Small Business Administration [Member] |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for loan losses | 0 |  |  |
Loans outstanding, net | 613,924,000 |  |  |
Loans and leases receivable, gross, carrying amount | 629,853,000 |  |  |
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 | 409,000 |  |  |
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 | 31,000 |  |  |
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 | $ 7,000 |  |  |

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