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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, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Financing Receivable, Modified in Period, Amount $ 42,637 $ 45,757 $ 75,427 $ 59,653
Extended Maturity [Member]        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Financing Receivable, Modified in Period, Amount 6,016 45,656 14,770 51,124
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 13,337 36 26,371 258
Other-Than Insignificant Payment Delay        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Financing Receivable, Modified in Period, Amount 1,036   12,038 8,159
Term Extension and OtherThan Insignificant Payment Delays        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Financing Receivable, Modified in Period, Amount     22,248  
Term Extension and Other-Than Insignificant Payment Delay [Domain]        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Financing Receivable, Modified in Period, Amount 22,248      
Commercial And Industrial [Member] | Extended Maturity [Member]        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Financing Receivable, Modified in Period, Amount $ 3,879 $ 12,667 $ 8,986 $ 12,670
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage 0.12% 0.42% 0.28% 0.42%
Added weighted-average contractual term to the life of the loan 1 year 2 years 3 months 18 days 11 months 2 years 3 months 18 days
Commercial And Industrial [Member] | Extended Maturity and Interest Rate Reduction [Member]        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Financing Receivable, Modified in Period, Amount $ 93   $ 93 $ 152
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage 0.00%   0.00% 0.01%
Added weighted-average contractual term to the life of the loan 5 years   5 years 1 year 6 months
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% 10.10%
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%   6.69% 7.20%
Commercial And Industrial [Member] | Other-Than Insignificant Payment Delay        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Financing Receivable, Modified in Period, Amount $ 1,036   $ 1,036 $ 8,159
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage 0.03%   0.03% 0.27%
Commercial Real Estate [Member] | Extended Maturity [Member]        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Financing Receivable, Modified in Period, Amount $ 1,653 $ 28,239 $ 5,028 $ 31,614
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage 0.03% 0.42% 0.08% 0.47%
Added weighted-average contractual term to the life of the loan   5 months 5 months 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 $ 13,015   $ 25,093  
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage 0.20%   0.38%  
Added weighted-average contractual term to the life of the loan 3 years   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 7.70%   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 6.25%   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     0.17%  
Commercial Real Estate [Member] | Term Extension and OtherThan Insignificant Payment Delays        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Financing Receivable, Modified in Period, Amount     $ 22,248  
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage     0.34%  
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%   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%   5.50%  
Commercial Real Estate [Member] | Term Extension and Other-Than Insignificant Payment Delay [Domain]        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Financing Receivable, Modified in Period, Amount $ 22,248      
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage 0.34%      
Construction Loans [Member] | Extended Maturity [Member]        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Financing Receivable, Modified in Period, Amount   $ 4,452   $ 6,542
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage   0.57%   0.83%
Added weighted-average contractual term to the life of the loan 3 months 12 months   10 months
Residential Real Estate [Member] | Extended Maturity [Member]        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Financing Receivable, Modified in Period, Amount   $ 298 $ 272 $ 298
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage   0.01% 0.01% 0.01%
Added weighted-average contractual term to the life of the loan   6 years 2 months 12 days 17 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 $ 245   $ 245  
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage 0.02%   0.02%  
Added weighted-average contractual term to the life of the loan 5 years 2 months 12 days   5 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 $ 229   $ 1,185 $ 70
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage 0.02%   0.10% 0.01%
Added weighted-average contractual term to the life of the loan 17 years 6 months   23 years 7 months 6 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] | Extended Maturity [Member]        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Financing Receivable, Modified in Period, Amount $ 239   $ 239  
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage 0.08%   0.08%  
Added weighted-average contractual term to the life of the loan 5 years 2 months 12 days   5 years 2 months 12 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   10.25%   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   6.50%   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
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   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%
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%