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Allowance for Credit Losses - Loan Modifications to Borrowers Experiencing Financial Difficulty (Details) - USD ($)
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Loan Modifications to Borrowers Experiencing Financial Difficulty    
Amortized Cost Basis $ 7,088,000 $ 7,014,000
Commitments related to borrowers experiencing financial difficulty 0 5,000,000
Aggregate commitments to extend credit, standby letters of credit and commercial letters of credit 6,000,000,000 6,500,000,000
Financial Asset, 30 to 59 Days Past Due [Member]    
Loan Modifications to Borrowers Experiencing Financial Difficulty    
Amortized Cost Basis 120,000 107,000
Financial Asset, 60 to 89 Days Past Due [Member]    
Loan Modifications to Borrowers Experiencing Financial Difficulty    
Amortized Cost Basis 269,000 70,000
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]    
Loan Modifications to Borrowers Experiencing Financial Difficulty    
Amortized Cost Basis 420,000 15,000
Financial Asset, Past Due [Member]    
Loan Modifications to Borrowers Experiencing Financial Difficulty    
Amortized Cost Basis 809,000 192,000
Financial Asset, Not Past Due [Member]    
Loan Modifications to Borrowers Experiencing Financial Difficulty    
Amortized Cost Basis 6,279,000 6,822,000
Commercial and Industrial    
Loan Modifications to Borrowers Experiencing Financial Difficulty    
Amortized Cost Basis 456,000 524,000
Commercial and Industrial | Financial Asset, Not Past Due [Member]    
Loan Modifications to Borrowers Experiencing Financial Difficulty    
Amortized Cost Basis 456,000 524,000
Construction Portfolio Segment [Member]    
Loan Modifications to Borrowers Experiencing Financial Difficulty    
Amortized Cost Basis   665,000
Construction Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]    
Loan Modifications to Borrowers Experiencing Financial Difficulty    
Amortized Cost Basis   665,000
Commercial Real Estate    
Loan Modifications to Borrowers Experiencing Financial Difficulty    
Amortized Cost Basis 1,861,000 3,119,000
Commercial Real Estate | Financial Asset, Not Past Due [Member]    
Loan Modifications to Borrowers Experiencing Financial Difficulty    
Amortized Cost Basis 1,861,000 3,119,000
Residential mortgage    
Loan Modifications to Borrowers Experiencing Financial Difficulty    
Amortized Cost Basis 3,023,000 1,410,000
Residential mortgage | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]    
Loan Modifications to Borrowers Experiencing Financial Difficulty    
Amortized Cost Basis 316,000  
Residential mortgage | Financial Asset, Past Due [Member]    
Loan Modifications to Borrowers Experiencing Financial Difficulty    
Amortized Cost Basis 316,000  
Residential mortgage | Financial Asset, Not Past Due [Member]    
Loan Modifications to Borrowers Experiencing Financial Difficulty    
Amortized Cost Basis 2,707,000 1,410,000
Consumer    
Loan Modifications to Borrowers Experiencing Financial Difficulty    
Amortized Cost Basis 1,748,000 1,296,000
Consumer | Financial Asset, 30 to 59 Days Past Due [Member]    
Loan Modifications to Borrowers Experiencing Financial Difficulty    
Amortized Cost Basis 120,000 107,000
Consumer | Financial Asset, 60 to 89 Days Past Due [Member]    
Loan Modifications to Borrowers Experiencing Financial Difficulty    
Amortized Cost Basis 269,000 70,000
Consumer | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]    
Loan Modifications to Borrowers Experiencing Financial Difficulty    
Amortized Cost Basis 104,000 15,000
Consumer | Financial Asset, Past Due [Member]    
Loan Modifications to Borrowers Experiencing Financial Difficulty    
Amortized Cost Basis 493,000 192,000
Consumer | Financial Asset, Not Past Due [Member]    
Loan Modifications to Borrowers Experiencing Financial Difficulty    
Amortized Cost Basis 1,255,000 1,104,000
Interest Rate Reduction    
Loan Modifications to Borrowers Experiencing Financial Difficulty    
Amortized Cost Basis $ 1,485,000 $ 1,166,000
% of Total Class of Financing Receivable 1.00% 1.00%
Amortized Cost Basis of Modified Loans That Subsequently Defaulted $ 807,000 $ 318,000
Interest Rate Reduction | Commercial Real Estate    
Loan Modifications to Borrowers Experiencing Financial Difficulty    
Amortized Cost Basis   $ 5,000
Reduced weighted-average contractual interest rate   0.75%
Interest Rate Reduction | Consumer    
Loan Modifications to Borrowers Experiencing Financial Difficulty    
Amortized Cost Basis $ 1,485,000 $ 1,161,000
% of Total Class of Financing Receivable 15.00% 10.00%
Reduced weighted-average contractual interest rate 13.47% 13.01%
Amortized Cost Basis of Modified Loans That Subsequently Defaulted $ 807,000 $ 318,000
Term Extension    
Loan Modifications to Borrowers Experiencing Financial Difficulty    
Amortized Cost Basis $ 3,637,000 $ 5,848,000
% of Total Class of Financing Receivable 0.03% 0.04%
Amortized Cost Basis of Modified Loans That Subsequently Defaulted $ 463,000 $ 6,000
Term Extension | Commercial and Industrial    
Loan Modifications to Borrowers Experiencing Financial Difficulty    
Amortized Cost Basis $ 456,000 $ 524,000
% of Total Class of Financing Receivable 0.02% 0.02%
Added weighted-average years to the life of loans 3 years 7 months 6 days 2 years 1 month 6 days
Amortized Cost Basis of Modified Loans That Subsequently Defaulted $ 121,000  
Term Extension | Construction Portfolio Segment [Member]    
Loan Modifications to Borrowers Experiencing Financial Difficulty    
Amortized Cost Basis   $ 665,000
% of Total Class of Financing Receivable   0.07%
Added weighted-average years to the life of loans   1 year
Term Extension | Commercial Real Estate    
Loan Modifications to Borrowers Experiencing Financial Difficulty    
Amortized Cost Basis $ 1,861,000 $ 3,114,000
% of Total Class of Financing Receivable 0.04% 0.07%
Added weighted-average years to the life of loans 9 months 18 days 2 years 1 month 6 days
Term Extension | Residential mortgage    
Loan Modifications to Borrowers Experiencing Financial Difficulty    
Amortized Cost Basis $ 1,057,000 $ 1,410,000
% of Total Class of Financing Receivable 0.03% 0.03%
Added weighted-average years to the life of loans 9 months 18 days 2 years 1 month 6 days
Amortized Cost Basis of Modified Loans That Subsequently Defaulted $ 316,000  
Deferred loan payments 342,000  
Term Extension | Consumer    
Loan Modifications to Borrowers Experiencing Financial Difficulty    
Amortized Cost Basis $ 263,000 $ 135,000
% of Total Class of Financing Receivable 0.03% 0.01%
Added weighted-average years to the life of loans 4 years 8 months 12 days 3 years 9 months 18 days
Amortized Cost Basis of Modified Loans That Subsequently Defaulted $ 26,000 $ 6,000
Other-Than-Insignificant Payment Delay    
Loan Modifications to Borrowers Experiencing Financial Difficulty    
Amortized Cost Basis $ 1,966,000  
% of Total Class of Financing Receivable 0.01%  
Other-Than-Insignificant Payment Delay | Residential mortgage    
Loan Modifications to Borrowers Experiencing Financial Difficulty    
Amortized Cost Basis $ 1,966,000  
% of Total Class of Financing Receivable 0.05%