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Loans, Allowance for Credit Losses and Credit Quality Troubled Debt Restructurings (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 USD ($) contract | Sep. 30, 2019 USD ($) contract | Sep. 30, 2020 USD ($) contract | Sep. 30, 2019 USD ($) contract | Dec. 31, 2019 USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Number of Contracts | contract | 5 | 5 | 17 | 9 |
Tdrs Recorded Investment On Accrual Status | $ 17,521 |  | $ 17,521 |  | $ 19,599
Tdrs Recorded Investment On Nonaccrual Status | 23,810 |  | 23,810 |  | 24,766
Financing Receivable Recorded Investment Trouble Debt Restructuring | 41,331 |  | 41,331 |  | 44,365
Amount Of Specific Reserves Included In Allowance For Loan Losses Associated With Trouble Debt Restructuring |  |  |  |  | 855
Additional Commitments To Lend To Borrower For Trouble Debt Restructuring | 158 |  | 158 |  | $ 63
Financing Receivable, Troubled Debt Restructuring, Premodification | 827 | $ 448 | 3,580 | $ 784 |
Financing Receivable, Troubled Debt Restructuring, Postmodification | $ 827 | $ 453 | $ 3,639 | $ 789 |
Commercial And Industrial [Member] |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Number of Contracts | contract | 2 | 1 | 5 | 2 |
Financing Receivable, Troubled Debt Restructuring, Premodification | $ 83 | $ 87 | $ 391 | $ 184 |
Financing Receivable, Troubled Debt Restructuring, Postmodification | $ 83 | $ 87 | $ 391 | $ 184 |
Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Number of Contracts | contract | 3 | 1 | 8 | 2 |
Financing Receivable, Troubled Debt Restructuring, Premodification | $ 744 | $ 133 | $ 2,518 | $ 283 |
Financing Receivable, Troubled Debt Restructuring, Postmodification | $ 744 | $ 133 | $ 2,518 | $ 283 |
Small Business [Member] |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Number of Contracts | contract | 0 | 1 | 2 | 2 |
Financing Receivable, Troubled Debt Restructuring, Premodification |  | $ 19 | $ 112 | $ 33 |
Financing Receivable, Troubled Debt Restructuring, Postmodification |  | 19 | $ 88 | $ 33 |
Residential Real Estate [Member] |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Number of Contracts | contract | 0 |  | 2 | 1 |
Financing Receivable, Troubled Debt Restructuring, Premodification |  | 163 | $ 559 | $ 163 |
Financing Receivable, Troubled Debt Restructuring, Postmodification |  | $ 168 | $ 642 | $ 168 |
Home Equity Line of Credit [Member] |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Number of Contracts | contract |  | 1 |  | 2 |
Financing Receivable, Troubled Debt Restructuring, Premodification |  | $ 46 |  | $ 121 |
Financing Receivable, Troubled Debt Restructuring, Postmodification |  | $ 46 |  | $ 121 |

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