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v3.24.3

Allowance for Credit Losses - Loan Modified to Borrowers Experiencing Financial Difficulty (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Troubled debt restructuring modifications |  |  |  |  |
Amortized Cost Basis |  |  | $ 6,684,000 | $ 3,411,000 |
Commitments related to borrowers experiencing financial difficulty | $ 0 |  | 0 |  |
Aggregate commitments to extend credit, standby letters of credit and commercial letters of credit | 6,500,000,000 |  | 6,500,000,000 |  | $ 6,500,000,000
Commitments related to borrowers experiencing financial difficulty |  |  |  |  | $ 5,000,000.0
Financial Asset, 30 to 59 Days Past Due [Member] |  |  |  |  |
Troubled debt restructuring modifications |  |  |  |  |
Amortized Cost Basis |  |  | 141,000 | 62,000 |
Financial Asset, 60 to 89 Days Past Due [Member] |  |  |  |  |
Troubled debt restructuring modifications |  |  |  |  |
Amortized Cost Basis |  |  | 425,000 | 18,000 |
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |  |  |
Troubled debt restructuring modifications |  |  |  |  |
Amortized Cost Basis |  |  | 79,000 | 18,000 |
Financial Asset, Past Due [Member] |  |  |  |  |
Troubled debt restructuring modifications |  |  |  |  |
Amortized Cost Basis |  |  | 645,000 | 98,000 |
Financial Asset, Not Past Due [Member] |  |  |  |  |
Troubled debt restructuring modifications |  |  |  |  |
Amortized Cost Basis |  |  | 6,039,000 | 3,313,000 |
Commercial and Industrial |  |  |  |  |
Troubled debt restructuring modifications |  |  |  |  |
Amortized Cost Basis |  |  | 371,000 | 248,000 |
Commercial and Industrial | Financial Asset, Not Past Due [Member] |  |  |  |  |
Troubled debt restructuring modifications |  |  |  |  |
Amortized Cost Basis |  |  | 371,000 | 248,000 |
Construction |  |  |  |  |
Troubled debt restructuring modifications |  |  |  |  |
Amortized Cost Basis |  |  |  | 897,000 |
Construction | Financial Asset, Not Past Due [Member] |  |  |  |  |
Troubled debt restructuring modifications |  |  |  |  |
Amortized Cost Basis |  |  |  | 897,000 |
Commercial Real Estate |  |  |  |  |
Troubled debt restructuring modifications |  |  |  |  |
Amortized Cost Basis |  |  | 2,308,000 | 1,214,000 |
Commercial Real Estate | Financial Asset, Not Past Due [Member] |  |  |  |  |
Troubled debt restructuring modifications |  |  |  |  |
Amortized Cost Basis |  |  | 2,308,000 | 1,214,000 |
Residential mortgage |  |  |  |  |
Troubled debt restructuring modifications |  |  |  |  |
Amortized Cost Basis |  |  | 2,139,000 | 33,000 |
Residential mortgage | Financial Asset, 60 to 89 Days Past Due [Member] |  |  |  |  |
Troubled debt restructuring modifications |  |  |  |  |
Amortized Cost Basis |  |  | 323,000 |  |
Residential mortgage | Financial Asset, Past Due [Member] |  |  |  |  |
Troubled debt restructuring modifications |  |  |  |  |
Amortized Cost Basis |  |  | 323,000 |  |
Residential mortgage | Financial Asset, Not Past Due [Member] |  |  |  |  |
Troubled debt restructuring modifications |  |  |  |  |
Amortized Cost Basis |  |  | 1,816,000 | 33,000 |
Consumer |  |  |  |  |
Troubled debt restructuring modifications |  |  |  |  |
Amortized Cost Basis |  |  | 1,866,000 | 1,019,000 |
Consumer | Financial Asset, 30 to 59 Days Past Due [Member] |  |  |  |  |
Troubled debt restructuring modifications |  |  |  |  |
Amortized Cost Basis |  |  | 141,000 | 62,000 |
Consumer | Financial Asset, 60 to 89 Days Past Due [Member] |  |  |  |  |
Troubled debt restructuring modifications |  |  |  |  |
Amortized Cost Basis |  |  | 102,000 | 18,000 |
Consumer | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |  |  |
Troubled debt restructuring modifications |  |  |  |  |
Amortized Cost Basis |  |  | 79,000 | 18,000 |
Consumer | Financial Asset, Past Due [Member] |  |  |  |  |
Troubled debt restructuring modifications |  |  |  |  |
Amortized Cost Basis |  |  | 322,000 | 98,000 |
Consumer | Financial Asset, Not Past Due [Member] |  |  |  |  |
Troubled debt restructuring modifications |  |  |  |  |
Amortized Cost Basis |  |  | 1,544,000 | 921,000 |
Interest Rate Reduction |  |  |  |  |
Troubled debt restructuring modifications |  |  |  |  |
Amortized Cost Basis | 416,000 | $ 255,000 | 1,384,000 | 889,000 |
% of Total Class of Financing Receivable |  | 0.01% |  |  |
Amortized Cost Basis of Modified Loans That Subsequently Defaulted | 452,000 | $ 166,000 | 584,000 | 186,000 |
Interest Rate Reduction | Consumer |  |  |  |  |
Troubled debt restructuring modifications |  |  |  |  |
Amortized Cost Basis | $ 416,000 | $ 255,000 | $ 1,384,000 | $ 889,000 |
% of Total Class of Financing Receivable | 0.04% | 0.02% | 0.13% | 0.08% |
Reduced weighted-average contractual interest rate | 13.41% | 13.31% | 13.53% | 13.22% |
Amortized Cost Basis of Modified Loans That Subsequently Defaulted | $ 452,000 | $ 166,000 | $ 584,000 | $ 186,000 |
Term Extension |  |  |  |  |
Troubled debt restructuring modifications |  |  |  |  |
Amortized Cost Basis | 910,000 | $ 831,000 | $ 3,534,000 | $ 2,522,000 |
% of Total Class of Financing Receivable |  | 0.01% | 0.02% | 0.02% |
Amortized Cost Basis of Modified Loans That Subsequently Defaulted | 469,000 |  | $ 469,000 |  |
Term Extension | Commercial and Industrial |  |  |  |  |
Troubled debt restructuring modifications |  |  |  |  |
Amortized Cost Basis | $ 115,000 | $ 145,000 | $ 371,000 | $ 248,000 |
% of Total Class of Financing Receivable |  | 0.01% | 0.02% | 0.01% |
Added weighted-average years to the life of loans | 5 years | 2 years 7 months 6 days | 4 years 3 months 18 days | 3 years |
Amortized Cost Basis of Modified Loans That Subsequently Defaulted | $ 122,000 |  | $ 122,000 |  |
Term Extension | Construction |  |  |  |  |
Troubled debt restructuring modifications |  |  |  |  |
Amortized Cost Basis |  | $ 669,000 |  | $ 897,000 |
% of Total Class of Financing Receivable |  | 0.08% |  | 0.10% |
Added weighted-average years to the life of loans |  | 1 year |  | 1 year 4 months 24 days |
Term Extension | Commercial Real Estate |  |  |  |  |
Troubled debt restructuring modifications |  |  |  |  |
Amortized Cost Basis | $ 705,000 |  | $ 1,873,000 | $ 1,214,000 |
% of Total Class of Financing Receivable | 0.02% |  | 0.04% | 0.03% |
Added weighted-average years to the life of loans | 4 months 24 days |  | 9 months 18 days | 1 year |
Term Extension | Residential mortgage |  |  |  |  |
Troubled debt restructuring modifications |  |  |  |  |
Amortized Cost Basis |  |  | $ 1,077,000 | $ 33,000 |
% of Total Class of Financing Receivable |  |  | 0.03% |  |
Added weighted-average years to the life of loans |  |  | 9 months 18 days | 5 years 10 months 24 days |
Amortized Cost Basis of Modified Loans That Subsequently Defaulted | $ 323,000 |  | $ 323,000 |  |
Term Extension | Consumer |  |  |  |  |
Troubled debt restructuring modifications |  |  |  |  |
Amortized Cost Basis | $ 90,000 | $ 17,000 | $ 213,000 | $ 130,000 |
% of Total Class of Financing Receivable |  |  | 0.02% | 0.01% |
Added weighted-average years to the life of loans | 5 years | 2 years 10 months 24 days | 4 years 6 months | 3 years 7 months 6 days |
Amortized Cost Basis of Modified Loans That Subsequently Defaulted | $ 24,000 |  | $ 24,000 |  |
Other-Than-Insignificant Payment Delay |  |  |  |  |
Troubled debt restructuring modifications |  |  |  |  |
Amortized Cost Basis |  |  | 1,062,000 |  |
Other-Than-Insignificant Payment Delay | Residential mortgage |  |  |  |  |
Troubled debt restructuring modifications |  |  |  |  |
Amortized Cost Basis |  |  | $ 1,062,000 |  |
% of Total Class of Financing Receivable |  |  | 0.03% |  |
Deferred loan payments |  |  | $ 172,000 |  |

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