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Financial Instruments and Other Inventory Positions - Schedule of Gross Fair Market Value and Total Absolute Notional Contract Amount (Details) - Not Designated as Hedging Instrument - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Derivative    
Notional amount $ 591,529 $ 565,193
Financial instruments and other inventory positions owned    
Derivative    
Derivative Assets 8,096 12,004
Financial instruments and other inventory positions sold, but not yet purchased    
Derivative    
Derivative Liabilities 10,573 9,071
Customer matched-book | Interest rate derivate contract    
Derivative    
Notional amount 355,129 393,860
Customer matched-book | Interest rate derivate contract | Financial instruments and other inventory positions owned    
Derivative    
Derivative Assets 7,033 10,906
Customer matched-book | Interest rate derivate contract | Financial instruments and other inventory positions sold, but not yet purchased    
Derivative    
Derivative Liabilities 4,878 8,629
Trading securities | Interest rate derivate contract    
Derivative    
Notional amount 236,400 171,333
Trading securities | Interest rate derivate contract | Financial instruments and other inventory positions owned    
Derivative    
Derivative Assets 1,063 1,098
Trading securities | Interest rate derivate contract | Financial instruments and other inventory positions sold, but not yet purchased    
Derivative    
Derivative Liabilities $ 5,695 $ 442