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Allowance for Credit Losses - Loan Modifications to Borrowers Experiencing Financial Difficulty (Details) - USD ($) | 12 Months Ended
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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% |

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