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Loans, Allowance for Credit Losses and Credit Quality - Finance Receivable, Nonaccrual (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Financing Receivable, Nonaccrual [Line Items]          
Finance Receivable, Nonaccrual, with allowance [1] $ 92,596   $ 92,596   $ 43,040
Financing Receivable, Nonaccrual, No Allowance [1] 11,652   11,652   11,343
Financing Receivable, Nonaccrual [1] 104,248   104,248   54,383
Accounts Receivable, Noncurrent, Accrued Interest, Writeoff 95 $ 62 594 $ 487  
Commercial And Industrial [Member]          
Financing Receivable, Nonaccrual [Line Items]          
Finance Receivable, Nonaccrual, with allowance 375   375   19,890
Financing Receivable, Nonaccrual, No Allowance 11,652   11,652   298
Financing Receivable, Nonaccrual 12,027   12,027   20,188
Commercial Real Estate [Member]          
Financing Receivable, Nonaccrual [Line Items]          
Finance Receivable, Nonaccrual, with allowance 77,951   77,951   11,911
Financing Receivable, Nonaccrual, No Allowance 0   0   11,041
Financing Receivable, Nonaccrual 77,951   77,951   22,952
Small Business [Member]          
Financing Receivable, Nonaccrual [Line Items]          
Finance Receivable, Nonaccrual, with allowance 501   501   394
Financing Receivable, Nonaccrual, No Allowance 0   0   4
Financing Receivable, Nonaccrual 501   501   398
Residential Real Estate [Member]          
Financing Receivable, Nonaccrual [Line Items]          
Finance Receivable, Nonaccrual, with allowance 9,744   9,744   7,634
Financing Receivable, Nonaccrual, No Allowance 0   0   0
Financing Receivable, Nonaccrual 9,744   9,744   7,634
Home Equity Loan [Member]          
Financing Receivable, Nonaccrual [Line Items]          
Finance Receivable, Nonaccrual, with allowance 3,992   3,992   3,171
Financing Receivable, Nonaccrual, No Allowance 0   0   0
Financing Receivable, Nonaccrual 3,992   3,992   3,171
Consumer - Other [Member]          
Financing Receivable, Nonaccrual [Line Items]          
Finance Receivable, Nonaccrual, with allowance 33   33   40
Financing Receivable, Nonaccrual, No Allowance 0   0   0
Financing Receivable, Nonaccrual $ 33   $ 33   $ 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, or reflect partially charged-off loans, with no risk of further loss.