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Related Party Transactions - Narrative (Details) $ in Thousands	Sep. 19, 2025 USD ($)	Aug. 31, 2025 USD ($) directorAndOfficer	Nov. 30, 2024 USD ($) directorAndOfficer
Related Party Transaction [Line Items]
Other assets		$ 3,304,448	$ 3,072,302
Number of directors and officers with investments | directorAndOfficer		2	2
Investments in and loans to related parties		$ 1,458,250	$ 1,385,658
Officers And Employees
Related Party Transaction [Line Items]
Other assets		19,700	29,400
Director
Related Party Transaction [Line Items]
Investments in and loans to related parties		9,200	5,000
Related Party | Sumitomo Mitsui Banking Corporation Agreement
Related Party Transaction [Line Items]
Other assets		$ 763	$ 175
Related Party | Sumitomo Mitsui Banking Corporation Agreement | Subsequent Event
Related Party Transaction [Line Items]
Ownership percentage	5.00%
Related Party | Sumitomo Mitsui Banking Corporation Agreement | Subsequent Event | Line of credit
Related Party Transaction [Line Items]
Equity investments	$ 2,500,000
Related Party | Sumitomo Mitsui Banking Corporation Agreement | Minimum | Subsequent Event
Related Party Transaction [Line Items]
Ownership percentage	14.50%
Related Party | Sumitomo Mitsui Banking Corporation Agreement | Maximum | Subsequent Event
Related Party Transaction [Line Items]
Ownership percentage	20.00%

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