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Loans and Allowance for Loan and Lease Losses (Narrative) (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 USD ($) Loan Borrower | Dec. 31, 2019 USD ($) Loan
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Financing receivable deferred fees and costs | $ 1,019,000 | $ 1,081,000
Financing receivable, modifications, recorded investment | $ 981,000 | $ 2,238,000
Number of troubled debt restructured loans | Loan | 0 | 0
Number of borrowers | Borrower | 482 |
Aggregate loans outstanding | $ 220,576,000 |
Eight Loans with Five Relationships [Member] | Nonaccruing [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Financing receivable, modifications, recorded investment |  | $ 1,748,000
One Large Relationships [Member] | Nonaccruing [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Financing receivable, modifications, recorded investment |  | 1,252,000
Residential Mortgage [Member] | Residential Portfolio [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Financing receivable, modifications, recorded investment | 495,000 | 490,000
Residential Mortgage [Member] | Residential Portfolio [Member] | Four Unrelated Borrowers [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Financing receivable, modifications, recorded investment | 495,000 |
Residential Mortgage [Member] | Residential Portfolio [Member] | Three Unrelated Borrowers [Member] | Accruing |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Financing receivable, modifications, recorded investment |  | $ 490,000
Commercial Real Estate [Member] | Residential Mortgage [Member] | Residential Portfolio [Member] | Four Unrelated Borrowers [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Financing receivable, modifications, recorded investment | 440,000 |
Commercial Real Estate - Construction [Member] | Residential Mortgage [Member] | Residential Portfolio [Member] | Four Unrelated Borrowers [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Financing receivable, modifications, recorded investment | 39,000 |
Commercial and Industrial [Member] | Residential Mortgage [Member] | Residential Portfolio [Member] | Four Unrelated Borrowers [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Financing receivable, modifications, recorded investment | $ 7,000 |

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