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Financial Instruments and Other Inventory Positions - Unrealized Gains/(Losses) on Derivative Instruments (Details) - Not Designated as Hedging Instrument - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Derivative Instruments, Gain (Loss)      
Unrealized gains/(losses) on derivative instruments $ (5,240) $ (398) $ (6,216)
Interest rate derivate contract | Investment banking      
Derivative Instruments, Gain (Loss)      
Unrealized gains/(losses) on derivative instruments (108) (3,361) (426)
Interest rate derivate contract | Institutional brokerage      
Derivative Instruments, Gain (Loss)      
Unrealized gains/(losses) on derivative instruments $ (5,132) $ 2,963 $ (5,790)