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Loans, Allowance for Credit Losses and Credit Quality - Amortized Cost of Loan Modifications (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Financing Receivable, Modified in Period, Amount | $ 45,757 | $ 35,305 | $ 59,653 | $ 47,812
Extended Maturity [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Financing Receivable, Modified in Period, Amount | 45,656 | 26,483 | 51,124 | 29,128
Contractual Interest Rate Reduction [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Financing Receivable, Modified in Period, Amount | 65 |  | 112 |
Extended Maturity and Interest Rate Reduction [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Financing Receivable, Modified in Period, Amount | 36 |  | 258 | 44
Term Extension and OtherThan Insignificant Payment Delays |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Financing Receivable, Modified in Period, Amount |  | 8,822 |  |
Other-Than Insignificant Payment Delay |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Financing Receivable, Modified in Period, Amount |  |  | 8,159 | 9,818
Commercial And Industrial [Member] | Extended Maturity [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Financing Receivable, Modified in Period, Amount | $ 7,792 | $ 8,193 | $ 7,795 | $ 8,193
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage | 0.49% | 0.48% | 0.49% | 0.48%
Added weighted-average contractual term to the life of the loan | 6 months | 1 month | 6 months | 1 month
Commercial And Industrial [Member] | Extended Maturity and Interest Rate Reduction [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Financing Receivable, Modified in Period, Amount |  |  | $ 152 |
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage |  |  | 0.01% |
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 |  |  | 10.10% |
Added weighted-average contractual term to the life of the loan |  |  | 1 year 6 months |
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 |  |  | 7.20% |
Commercial And Industrial [Member] | Term Extension and OtherThan Insignificant Payment Delays |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Financing Receivable, Modified in Period, Amount |  | $ 1,965 |  | $ 1,965
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage |  | 0.11% |  |
Commercial And Industrial [Member] | Other-Than Insignificant Payment Delay |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Financing Receivable, Modified in Period, Amount |  |  | $ 1,809 | $ 2,805
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage |  |  | 0.11% | 0.16%
Commercial Real Estate [Member] | Extended Maturity [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Financing Receivable, Modified in Period, Amount | $ 33,114 | $ 15,921 | $ 36,489 | $ 18,461
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage | 0.41% | 0.20% | 0.45% | 0.24%
Added weighted-average contractual term to the life of the loan |  | 1 year 10 months 24 days | 1 year | 1 year 9 months 18 days
Commercial Real Estate [Member] | Term Extension and OtherThan Insignificant Payment Delays |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Financing Receivable, Modified in Period, Amount |  | $ 6,857 |  |
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage |  | 0.09% |  |
Commercial Real Estate [Member] | Other-Than Insignificant Payment Delay |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Financing Receivable, Modified in Period, Amount |  |  | $ 6,350 | $ 7,013
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage |  |  | 0.08% | 0.09%
Construction Loans [Member] | Extended Maturity [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Financing Receivable, Modified in Period, Amount | $ 4,452 | $ 2,369 | $ 6,542 | $ 2,369
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage | 0.57% | 0.23% | 0.83% | 0.23%
Added weighted-average contractual term to the life of the loan | 1 year 1 month 6 days | 2 months | 10 months | 2 months
Residential Real Estate [Member] | Extended Maturity [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Financing Receivable, Modified in Period, Amount | $ 298 |  | $ 298 |
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage | 0.01% |  | 0.01% |
Added weighted-average contractual term to the life of the loan | 6 years 2 months 12 days |  | 6 years 2 months 12 days |
Home Equity Loan [Member] | Contractual Interest Rate Reduction [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Financing Receivable, Modified in Period, Amount | $ 65 |  | $ 65 |
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage | 0.01% |  | 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% |  | 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% |  | 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 |  |  | $ 70 |
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage |  |  | 0.01% |
Added weighted-average contractual term to the life of the loan |  |  | 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 |  |  | 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 |  |  | 6.80% |
Small Business [Member] | Extended Maturity [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Financing Receivable, Modified in Period, Amount |  |  |  | $ 105
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage |  |  |  | 0.04%
Added weighted-average contractual term to the life of the loan |  |  |  | 4 years 3 months 18 days
Small Business [Member] | Contractual Interest Rate Reduction [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Financing Receivable, Modified in Period, Amount |  |  | $ 47 |
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage |  |  | 0.02% |
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% |
Small Business [Member] | Extended Maturity and Interest Rate Reduction [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Financing Receivable, Modified in Period, Amount | $ 36 |  | $ 36 | $ 44
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage | 0.01% |  | 0.01% | 0.02%
Added weighted-average contractual term to the life of the loan | 2 years 6 months |  | 2 years 6 months |
Small Business [Member] | Extended Maturity and Interest Rate Reduction [Member] | Maximum [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Reduced weighted-average contractual interest rate | 10.25% |  | 10.25% | 10.00%
Small Business [Member] | Extended Maturity and Interest Rate Reduction [Member] | Minimum [Member] |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Reduced weighted-average contractual interest rate | 6.50% |  | 6.50% | 6.50%

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