v3.26.1
Derivatives, Derivatives Instruments Gain (Loss) in Income Statement (Details) - Not Designated as Hedging Instrument [Member] - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract]    
Brokergage and Trading Revenue $ 73,624 $ (65,407)
Gain (Loss) on Derivatives, Net (4,374) 9,565
Total customer risk management programs    
Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract]    
Brokergage and Trading Revenue 7,816 8,389
Gain (Loss) on Derivatives, Net 0 0
Interest rate contracts [Member]    
Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract]    
Brokergage and Trading Revenue 1,133 741
Gain (Loss) on Derivatives, Net 0 0
Energy contracts [Member]    
Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract]    
Brokergage and Trading Revenue 6,652 7,610
Gain (Loss) on Derivatives, Net 0 0
Foreign exchange contracts [Member]    
Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract]    
Brokergage and Trading Revenue 31 38
Gain (Loss) on Derivatives, Net 0 0
Equity option contracts [Member]    
Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract]    
Brokergage and Trading Revenue 0 0
Gain (Loss) on Derivatives, Net 0 0
Trading [Member]    
Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract]    
Brokergage and Trading Revenue [1] 65,808 (73,796)
Gain (Loss) on Derivatives, Net [1] 0 0
Internal risk management programs [Member]    
Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract]    
Brokergage and Trading Revenue 0 0
Gain (Loss) on Derivatives, Net $ (4,374) $ 9,565
[1] Represents changes in fair value of to-be-announced securities and other derivative instruments held to mitigate market risk of trading securities portfolio, which is offset by changes in fair value of trading securities also included in Other operating revenue - brokerage and trading revenue in the Consolidated Statements of Earnings.