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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%