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Loans, Allowance for Credit Losses and Credit Quality - Finance Receivable, Nonaccrual (Details) - USD ($)
Sep. 30, 2023
Dec. 31, 2022
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.