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Loans, Allowance for Credit Losses and Credit Quality Troubled Debt Restructurings (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2022 USD ($) contract | Sep. 30, 2021 USD ($) contract | Sep. 30, 2022 USD ($) contract | Sep. 30, 2021 USD ($) contract | Dec. 31, 2021 USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Number of Contracts | contract | 1 |  | 0 |  | 1 | 8 |  |
Financing Receivable, Troubled Debt Restructuring, Premodification | $ 68,000 | [1] | $ 0 | [1] | $ 68,000 | $ 18,301,000 | [1] |
Financing Receivable, Troubled Debt Restructuring, Postmodification | 67,000 | [1] | $ 0 | [1] | 67,000 | $ 18,301,000 | [1] |
Tdrs Recorded Investment On Accrual Status | 11,549,000 |  |  |  | 11,549,000 |  |  | $ 14,635,000
Tdrs Recorded Investment On Nonaccrual Status | 1,538,000 |  |  |  | 1,538,000 |  |  | 1,993,000
Financing Receivable Recorded Investment Trouble Debt Restructuring | 13,087,000 |  |  |  | 13,087,000 |  |  | 16,628,000
Additional Commitments To Lend To Borrower For Trouble Debt Restructuring | $ 137,000 |  |  |  | $ 137,000 |  |  | $ 190,000
Commercial And Industrial [Member] |  |  |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Number of Contracts | contract | 1 |  | 0 |  | 1 | 1 |  |
Financing Receivable, Troubled Debt Restructuring, Premodification | $ 68,000 |  | $ 0 |  | $ 68,000 | $ 14,148,000 |  |
Financing Receivable, Troubled Debt Restructuring, Postmodification | $ 67,000 |  | $ 0 |  | $ 67,000 | $ 14,148,000 |  |
Commercial Real Estate [Member] |  |  |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Number of Contracts | contract |  |  | 0 |  |  | 5 |  |
Financing Receivable, Troubled Debt Restructuring, Premodification |  |  | $ 0 |  |  | $ 3,964,000 |  |
Financing Receivable, Troubled Debt Restructuring, Postmodification |  |  | $ 0 |  |  | $ 3,964,000 |  |
Small Business [Member] |  |  |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |  |  |
Financing Receivable, Modifications, Number of Contracts | contract |  |  | 0 |  |  | 2 |  |
Financing Receivable, Troubled Debt Restructuring, Premodification |  |  | $ 0 |  |  | $ 189,000 |  |
Financing Receivable, Troubled Debt Restructuring, Postmodification |  |  | $ 0 |  |  | $ 189,000 |  |
[1] | The pre-modification and post-modification balances represent the legal principal balance of the loan. Activity presented in the table above includes $14.3 million of modifications on existing TDRs occurring during the nine months ended September 30, 2021.

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