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Contractual Obligations and Off-Balance Sheet Items - Additional Information (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) SubleaseArrangement | Jun. 30, 2023 USD ($) | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Mar. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Contractual Obligations And Off Balance Sheet Items [Line Items] |  |  |  |  |  |  |  |
Operating lease right of use asset | $ 34,600 |  | $ 34,600 |  |  |  |  |
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 | $ 828 | $ 688 | $ 1,700 | $ 1,500 |  |  |  |
Operating lease, weighted average remaining lease term | 5 years 7 months 6 days |  | 5 years 7 months 6 days |  |  |  |  |
Operating lease, weighted average discount rate, percent | 2.90% |  | 2.90% |  |  |  |  |
Operating lease, payments | $ 2,900 | 3,100 | $ 5,800 | 5,900 |  |  |  |
Right-of-Use asset obtained in exchange for operating lease liability |  |  | 2,100 |  |  |  |  |
Allowance for credit losses on off-balance sheet credit exposures | 37,646 | $ 36,503 | 37,646 | $ 36,503 | $ 36,503 | $ 36,503 | $ 29,947 | $ 29,947
Bank Term Funding Program [Member] |  |  |  |  |  |  |  |
Contractual Obligations And Off Balance Sheet Items [Line Items] |  |  |  |  |  |  |  |
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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- Definition Remaining lease term of operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-7A Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-3 + Details
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