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Derivatives - Gains and (Losses) on Derivative Contracts (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Principal transactions | Principal transactions | Principal transactions | Principal transactions
Gain (loss), net on derivative contract | $ 6,592 | $ 7,396 | $ 24,163 | $ 19,123
Interest rate swaps |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Gain (loss), net on derivative contract | 3,030 | 1,830 | 8,406 | 5,758
Futures |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Gain (loss), net on derivative contract | 2,779 | 4,603 | 12,710 | 11,242
FX swaps |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Gain (loss), net on derivative contract | 694 | 802 | 2,723 | 1,858
FX/commodities options |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Gain (loss), net on derivative contract | $ 89 | $ 161 | $ 324 | $ 265

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