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Loans, Allowance for Credit Losses and Credit Quality - Amortized Cost of Loan Modifications (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Financing Receivable, Modified in Period, Amount | $ 14,158 |  | $ 87,352 | $ 57,998
Extended Maturity [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Financing Receivable, Modified in Period, Amount | 13,895 | $ 10,492 | 26,935 | 49,533
Contractual Interest Rate Reduction [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Financing Receivable, Modified in Period, Amount |  |  |  | 106
Extended Maturity and Interest Rate Reduction [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Financing Receivable, Modified in Period, Amount | 102 |  | 26,434 | 200
Other-Than Insignificant Payment Delay |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Financing Receivable, Modified in Period, Amount | 161 |  | 11,735 |
Term Extension and OtherThan Insignificant Payment Delays |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Financing Receivable, Modified in Period, Amount |  | 8,159 | 22,248 |
Commercial And Industrial [Member] | Extended Maturity [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Financing Receivable, Modified in Period, Amount |  | $ 5,985 | $ 8,965 | $ 13,161
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage |  | 0.19% | 0.20% | 0.42%
Added weighted-average contractual term to the life of the loan |  | 4 months | 1 year | 1 year 1 month 6 days
Commercial And Industrial [Member] | Contractual Interest Rate Reduction [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Financing Receivable, Modified in Period, Amount |  |  |  | $ 42
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage |  |  |  | 0.00%
Commercial And Industrial [Member] | Extended Maturity and Interest Rate Reduction [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Financing Receivable, Modified in Period, Amount |  |  | $ 89 | $ 131
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage |  |  | 0.00% | 0.00%
Added weighted-average contractual term to the life of the loan |  |  | 5 years | 1 year 9 months 18 days
Commercial And Industrial [Member] | Extended Maturity and Interest Rate Reduction [Member] | Maximum [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Reduced weighted-average contractual interest rate |  |  | 9.50% | 10.14%
Commercial And Industrial [Member] | Extended Maturity and Interest Rate Reduction [Member] | Minimum [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Reduced weighted-average contractual interest rate |  |  | 6.69% | 7.02%
Commercial And Industrial [Member] | Other-Than Insignificant Payment Delay |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Financing Receivable, Modified in Period, Amount | $ 161 |  | $ 733 |
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage | 0.00% |  | 0.02% |
Commercial And Industrial [Member] | Term Extension and OtherThan Insignificant Payment Delays |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Financing Receivable, Modified in Period, Amount |  |  |  | $ 1,809
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage |  | 0.06% |  |
Commercial Real Estate [Member] | Extended Maturity [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Financing Receivable, Modified in Period, Amount | $ 13,151 | $ 4,507 | $ 16,711 | $ 32,588
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage | 0.16% | 0.07% | 0.20% | 0.47%
Added weighted-average contractual term to the life of the loan |  | 5 months | 1 year | 5 months
Commercial Real Estate [Member] | Extended Maturity and Interest Rate Reduction [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Financing Receivable, Modified in Period, Amount |  |  | $ 25,060 |
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage |  |  | 0.30% |
Added weighted-average contractual term to the life of the loan |  |  | 3 years 8 months 12 days |
Commercial Real Estate [Member] | Extended Maturity and Interest Rate Reduction [Member] | Maximum [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Reduced weighted-average contractual interest rate |  |  | 7.85% |
Commercial Real Estate [Member] | Extended Maturity and Interest Rate Reduction [Member] | Minimum [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Reduced weighted-average contractual interest rate |  |  | 6.83% |
Commercial Real Estate [Member] | Other-Than Insignificant Payment Delay |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Financing Receivable, Modified in Period, Amount |  |  | $ 11,002 |
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage |  |  | 0.13% |
Commercial Real Estate [Member] | Term Extension and OtherThan Insignificant Payment Delays |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Financing Receivable, Modified in Period, Amount |  | $ 6,350 | $ 22,248 |
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage |  | 0.09% | 0.27% |
Commercial Real Estate [Member] | Term Extension and OtherThan Insignificant Payment Delays | Maximum [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Reduced weighted-average contractual interest rate |  |  | 5.91% |
Commercial Real Estate [Member] | Term Extension and OtherThan Insignificant Payment Delays | Minimum [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Reduced weighted-average contractual interest rate |  |  | 5.50% |
Construction Loans [Member] | Extended Maturity [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Financing Receivable, Modified in Period, Amount |  |  |  | $ 3,488
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage |  |  |  | 0.47%
Added weighted-average contractual term to the life of the loan | 1 year 1 month 6 days |  |  | 10 months
Residential Real Estate [Member] | Extended Maturity [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Financing Receivable, Modified in Period, Amount | $ 737 |  | $ 1,008 | $ 297
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage | 0.03% |  | 0.03% | 0.00%
Added weighted-average contractual term to the life of the loan | 6 years 9 months 18 days |  | 9 years 9 months 18 days | 6 years 2 months 12 days
Home Equity Loan [Member] | Extended Maturity [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Financing Receivable, Modified in Period, Amount | $ 7 |  | $ 251 |
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage | 0.00% |  | 0.02% |
Added weighted-average contractual term to the life of the loan | 1 year 1 month 6 days |  | 5 years 1 month 6 days |
Home Equity Loan [Member] | Contractual Interest Rate Reduction [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Financing Receivable, Modified in Period, Amount |  |  |  | $ 64
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage |  |  |  | 0.01%
Home Equity Loan [Member] | Contractual Interest Rate Reduction [Member] | Maximum [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Reduced weighted-average contractual interest rate |  |  |  | 7.99%
Home Equity Loan [Member] | Contractual Interest Rate Reduction [Member] | Minimum [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Reduced weighted-average contractual interest rate |  |  |  | 7.00%
Home Equity Loan [Member] | Extended Maturity and Interest Rate Reduction [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Financing Receivable, Modified in Period, Amount | $ 102 |  | $ 1,285 | $ 69
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage | 0.01% |  | 0.10% | 0.01%
Added weighted-average contractual term to the life of the loan | 15 years 4 months 24 days |  | 22 years 10 months 24 days | 8 years 1 month 6 days
Home Equity Loan [Member] | Extended Maturity and Interest Rate Reduction [Member] | Maximum [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Reduced weighted-average contractual interest rate | 7.24% |  | 7.25% | 10.00%
Home Equity Loan [Member] | Extended Maturity and Interest Rate Reduction [Member] | Minimum [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Reduced weighted-average contractual interest rate | 6.88% |  | 6.88% | 6.80%
Small Business [Member] | Contractual Interest Rate Reduction [Member] | Maximum [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Reduced weighted-average contractual interest rate |  |  |  | 11.00%
Small Business [Member] | Contractual Interest Rate Reduction [Member] | Minimum [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Reduced weighted-average contractual interest rate |  |  |  | 8.20%

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