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Allowance for Credit Losses - Loan Modifications to Borrowers Experiencing Financial Difficulty (Details) - USD ($)
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Loan Modifications to Borrowers Experiencing Financial Difficulty      
Amortized Cost Basis $ 18,315,000 $ 7,162,000  
Commitments related to borrowers experiencing financial difficulty 0   $ 0
Aggregate commitments to extend credit, standby letters of credit and commercial letters of credit 6,100,000,000   $ 6,000,000,000
30 - 59 Days Past Due      
Loan Modifications to Borrowers Experiencing Financial Difficulty      
Amortized Cost Basis 155,000 96,000  
60 - 89 Days Past Due      
Loan Modifications to Borrowers Experiencing Financial Difficulty      
Amortized Cost Basis 41,000 86,000  
90 Days or Greater Past Due      
Loan Modifications to Borrowers Experiencing Financial Difficulty      
Amortized Cost Basis 98,000 22,000  
Past Due      
Loan Modifications to Borrowers Experiencing Financial Difficulty      
Amortized Cost Basis 294,000 204,000  
Not Past Due      
Loan Modifications to Borrowers Experiencing Financial Difficulty      
Amortized Cost Basis 18,021,000 6,958,000  
Commercial and Industrial      
Loan Modifications to Borrowers Experiencing Financial Difficulty      
Amortized Cost Basis 10,813,000 467,000  
Commercial and Industrial | Not Past Due      
Loan Modifications to Borrowers Experiencing Financial Difficulty      
Amortized Cost Basis 10,813,000 467,000  
Construction      
Loan Modifications to Borrowers Experiencing Financial Difficulty      
Amortized Cost Basis   657,000  
Construction | Not Past Due      
Loan Modifications to Borrowers Experiencing Financial Difficulty      
Amortized Cost Basis   657,000  
Commercial Real Estate      
Loan Modifications to Borrowers Experiencing Financial Difficulty      
Amortized Cost Basis 3,497,000 2,857,000  
Commercial Real Estate | Not Past Due      
Loan Modifications to Borrowers Experiencing Financial Difficulty      
Amortized Cost Basis 3,497,000 2,857,000  
Residential mortgage      
Loan Modifications to Borrowers Experiencing Financial Difficulty      
Amortized Cost Basis 2,352,000 1,570,000  
Residential mortgage | Not Past Due      
Loan Modifications to Borrowers Experiencing Financial Difficulty      
Amortized Cost Basis 2,352,000 1,570,000  
Consumer      
Loan Modifications to Borrowers Experiencing Financial Difficulty      
Amortized Cost Basis 1,653,000 1,611,000  
Consumer | 30 - 59 Days Past Due      
Loan Modifications to Borrowers Experiencing Financial Difficulty      
Amortized Cost Basis 155,000 96,000  
Consumer | 60 - 89 Days Past Due      
Loan Modifications to Borrowers Experiencing Financial Difficulty      
Amortized Cost Basis 41,000 86,000  
Consumer | 90 Days or Greater Past Due      
Loan Modifications to Borrowers Experiencing Financial Difficulty      
Amortized Cost Basis 98,000 22,000  
Consumer | Past Due      
Loan Modifications to Borrowers Experiencing Financial Difficulty      
Amortized Cost Basis 294,000 204,000  
Consumer | Not Past Due      
Loan Modifications to Borrowers Experiencing Financial Difficulty      
Amortized Cost Basis 1,359,000 1,407,000  
Interest Rate Reduction      
Loan Modifications to Borrowers Experiencing Financial Difficulty      
Amortized Cost Basis 589,000 628,000  
Amortized Cost Basis of Modified Loans That Subsequently Defaulted 410,000 300,000  
Interest Rate Reduction | Consumer      
Loan Modifications to Borrowers Experiencing Financial Difficulty      
Amortized Cost Basis $ 589,000 $ 628,000  
% of Total Class of Financing Receivable 0.06% 0.06%  
Reduced weighted-average contractual interest rate 13.20% 13.55%  
Amortized Cost Basis of Modified Loans That Subsequently Defaulted $ 410,000 $ 300,000  
Term Extension      
Loan Modifications to Borrowers Experiencing Financial Difficulty      
Amortized Cost Basis $ 12,014,000 627,000  
% of Total Class of Financing Receivable 0.08%    
Amortized Cost Basis of Modified Loans That Subsequently Defaulted $ 406,000 7,000  
Term Extension | Commercial and Industrial      
Loan Modifications to Borrowers Experiencing Financial Difficulty      
Amortized Cost Basis $ 10,584,000 $ 199,000  
% of Total Class of Financing Receivable 0.47% 0.01%  
Added weighted-average years to the life of loans 4 months 24 days 3 years 9 months 18 days  
Amortized Cost Basis of Modified Loans That Subsequently Defaulted $ 73,000    
Term Extension | Commercial Real Estate      
Loan Modifications to Borrowers Experiencing Financial Difficulty      
Amortized Cost Basis $ 1,347,000    
% of Total Class of Financing Receivable 0.03%    
Added weighted-average years to the life of loans 3 months 18 days    
Term Extension | Residential mortgage      
Loan Modifications to Borrowers Experiencing Financial Difficulty      
Amortized Cost Basis   $ 310,000  
% of Total Class of Financing Receivable   0.01%  
Added weighted-average years to the life of loans   1 year  
Amortized Cost Basis of Modified Loans That Subsequently Defaulted $ 312,000    
Term Extension | Consumer      
Loan Modifications to Borrowers Experiencing Financial Difficulty      
Amortized Cost Basis $ 83,000 $ 118,000  
% of Total Class of Financing Receivable   0.01%  
Added weighted-average years to the life of loans 4 years 4 months 24 days 4 years 2 months 12 days  
Amortized Cost Basis of Modified Loans That Subsequently Defaulted $ 21,000 $ 7,000  
Other-Than-Insignificant Payment Delay      
Loan Modifications to Borrowers Experiencing Financial Difficulty      
Amortized Cost Basis 1,007,000 1,260,000  
Other-Than-Insignificant Payment Delay | Commercial Real Estate      
Loan Modifications to Borrowers Experiencing Financial Difficulty      
Amortized Cost Basis $ 1,007,000    
% of Total Class of Financing Receivable 0.02%    
Deferred loan payments $ 209,000    
Other-Than-Insignificant Payment Delay | Residential mortgage      
Loan Modifications to Borrowers Experiencing Financial Difficulty      
Amortized Cost Basis   $ 1,260,000  
% of Total Class of Financing Receivable   0.03%  
Deferred loan payments   $ 172,000