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Loans, Allowance for Credit Losses and Credit Quality - Finance Receivable, Nonaccrual (Details) - USD ($) | Sep. 30, 2023 | Dec. 31, 2022
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Financing Receivable, Nonaccrual [Line Items] |  |  |
Finance Receivable, Nonaccrual, with allowance | [1] | $ 27,177,000 | $ 51,809,000
Financing Receivable, Nonaccrual, No Allowance | [1] | 11,991,000 | 3,072,000
Financing Receivable, Nonaccrual | [1] | 39,168,000 | 54,881,000
TDRs on nonaccrual |  |  | 11,520,000
Commercial And Industrial [Member] |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |
Finance Receivable, Nonaccrual, with allowance |  | 2,655,000 | 26,395,000
Financing Receivable, Nonaccrual, No Allowance |  | 298,000 | 298,000
Financing Receivable, Nonaccrual |  | 2,953,000 | 26,693,000
Commercial Real Estate [Member] |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |
Finance Receivable, Nonaccrual, with allowance |  | 12,178,000 | 12,961,000
Financing Receivable, Nonaccrual, No Allowance |  | 11,689,000 | 2,769,000
Financing Receivable, Nonaccrual |  | 23,867,000 | 15,730,000
Small Business [Member] |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |
Finance Receivable, Nonaccrual, with allowance |  | 368,000 | 99,000
Financing Receivable, Nonaccrual, No Allowance |  | 4,000 | 5,000
Financing Receivable, Nonaccrual |  | 372,000 | 104,000
Residential Real Estate [Member] |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |
Finance Receivable, Nonaccrual, with allowance |  | 8,493,000 | 8,479,000
Financing Receivable, Nonaccrual, No Allowance |  | 0 | 0
Financing Receivable, Nonaccrual |  | 8,493,000 | 8,479,000
Home Equity Loan [Member] |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |
Finance Receivable, Nonaccrual, with allowance |  | 3,411,000 | 3,400,000
Financing Receivable, Nonaccrual, No Allowance |  | 0 | 0
Financing Receivable, Nonaccrual |  | 3,411,000 | 3,400,000
Consumer - Other [Member] |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |
Finance Receivable, Nonaccrual, with allowance |  | 72,000 | 475,000
Financing Receivable, Nonaccrual, No Allowance |  | 0 | 0
Financing Receivable, Nonaccrual |  | $ 72,000 | $ 475,000
[1] | included $11.5 million of nonaccruing troubled debt restructures ("TDRs"). (2)Nonaccrual balances reported above without an allowance for credit losses are attributable to loans evaluated on an individual basis where it was determined that there was no risk of loss due to sufficient underlying collateral values.

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- Definition Finance Receivable, Nonaccrual, with allowance + References No definition available. + Details
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- Definition Troubled Debt Restructurings recorded investment that are on nonaccrual status as of the balance sheet date. + References No definition available. + Details
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- Definition Amortized cost of financing receivable on nonaccrual status with no allowance for credit loss. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 16 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-16 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 16 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-16 + Details
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