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Contractual Obligations and Off-Balance Sheet Items - Additional Information (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) SubleaseArrangement | Sep. 30, 2023 USD ($) | Jul. 01, 2024 USD ($) | Dec. 31, 2023 USD ($) | Jul. 01, 2023 USD ($) | Dec. 31, 2022 USD ($)
Contractual Obligations And Off Balance Sheet Items [Line Items] |  |  |  |  |  |  |  |
Operating lease right of use asset | $ 35,500 |  | $ 35,500 |  |  |  |  |
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] | Other assets |  | Other assets |  |  |  |  |
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration] | Other liabilities |  | Other liabilities |  |  |  |  |
Number of sublease arrangement | SubleaseArrangement |  |  | 1 |  |  |  |  |
Sublease income | $ 826 | $ 816 | $ 2,500 | $ 2,300 |  |  |  |
Operating lease, weighted average remaining lease term | 5 years 10 months 24 days |  | 5 years 10 months 24 days |  |  |  |  |
Operating lease, weighted average discount rate, percent | 3.00% |  | 3.00% |  |  |  |  |
Operating lease, payments | $ 2,900 | 3,100 | $ 8,700 | 9,000 |  |  |  |
Right-of-Use asset obtained in exchange for operating lease liability |  |  | 5,200 |  |  |  |  |
Allowance for credit losses on off-balance sheet credit exposures | 37,646 | $ 36,503 | 37,646 | $ 36,503 | $ 37,646 | $ 36,503 | $ 36,503 | $ 29,947
Bank Term Funding Program [Member] |  |  |  |  |  |  |  |
Contractual Obligations And Off Balance Sheet Items [Line Items] |  |  |  |  |  |  |  |
Pledged assets value at par | 4,030,000 |  | 4,030,000 |  |  |  |  |
Outstanding amout consisting of one-term advance | 3,900,000 |  | $ 3,900,000 |  |  |  |  |
One-term advance maturity date |  |  | 2025-01 |  |  |  |  |
Interest rate |  |  | 4.76% |  |  |  |  |
Interest payable | $ 186,100 |  | $ 186,100 |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |
Contractual Obligations And Off Balance Sheet Items [Line Items] |  |  |  |  |  |  |  |
Lessee operating lease remaining lease term | 1 year |  | 1 year |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |
Contractual Obligations And Off Balance Sheet Items [Line Items] |  |  |  |  |  |  |  |
Lessee operating lease remaining lease term | 15 years |  | 15 years |  |  |  |  |

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