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Loans, Allowance for Credit Losses and Credit Quality - Finance Receivable, Nonaccrual (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Financing Receivable, Nonaccrual [Line Items] |  |  |  |  |  |
Finance Receivable, Nonaccrual, with allowance | [1] | $ 57,451 |  | $ 57,451 |  | $ 43,040
Financing Receivable, Nonaccrual, No Allowance | [1] | 0 |  | 0 |  | 11,343
Financing Receivable, Nonaccrual | [1] | 57,451 |  | 57,451 |  | 54,383
Accounts Receivable, Noncurrent, Accrued Interest, Writeoff |  | 112 | $ 345 | 497 | $ 425 |
Commercial And Industrial [Member] |  |  |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |  |  |
Finance Receivable, Nonaccrual, with allowance |  | 17,793 |  | 17,793 |  | 19,890
Financing Receivable, Nonaccrual, No Allowance |  | 0 |  | 0 |  | 298
Financing Receivable, Nonaccrual |  | 17,793 |  | 17,793 |  | 20,188
Commercial Real Estate [Member] |  |  |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |  |  |
Finance Receivable, Nonaccrual, with allowance |  | 23,479 |  | 23,479 |  | 11,911
Financing Receivable, Nonaccrual, No Allowance |  | 0 |  | 0 |  | 11,041
Financing Receivable, Nonaccrual |  | 23,479 |  | 23,479 |  | 22,952
Small Business [Member] |  |  |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |  |  |
Finance Receivable, Nonaccrual, with allowance |  | 437 |  | 437 |  | 394
Financing Receivable, Nonaccrual, No Allowance |  | 0 |  | 0 |  | 4
Financing Receivable, Nonaccrual |  | 437 |  | 437 |  | 398
Residential Real Estate [Member] |  |  |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |  |  |
Finance Receivable, Nonaccrual, with allowance |  | 10,629 |  | 10,629 |  | 7,634
Financing Receivable, Nonaccrual, No Allowance |  | 0 |  | 0 |  | 0
Financing Receivable, Nonaccrual |  | 10,629 |  | 10,629 |  | 7,634
Home Equity Loan [Member] |  |  |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |  |  |
Finance Receivable, Nonaccrual, with allowance |  | 5,090 |  | 5,090 |  | 3,171
Financing Receivable, Nonaccrual, No Allowance |  | 0 |  | 0 |  | 0
Financing Receivable, Nonaccrual |  | 5,090 |  | 5,090 |  | 3,171
Consumer - Other [Member] |  |  |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |  |  |
Finance Receivable, Nonaccrual, with allowance |  | 23 |  | 23 |  | 40
Financing Receivable, Nonaccrual, No Allowance |  | 0 |  | 0 |  | 0
Financing Receivable, Nonaccrual |  | $ 23 |  | $ 23 |  | $ 40
[1] | (1)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 Amount of writeoff of accrued interest on accounts receivable classified as noncurrent recognized by reversing interest income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3D -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-3D + Details
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