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Derivatives, Derivatives Instruments Gain (Loss) in Income Statement (Details) - Not Designated as Hedging Instrument [Member] - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract]        
Brokergage and Trading Revenue $ 28,366 $ 65,552 $ 51,441 $ 105,321
Gain (Loss) on Derivatives, Net (9,010) (17,009) (18,513) (77,559)
Total customer risk management programs        
Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract]        
Brokergage and Trading Revenue 6,855 13,179 28,851 37,250
Gain (Loss) on Derivatives, Net 0 0 0 0
Interest rate contracts [Member]        
Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract]        
Brokergage and Trading Revenue 800 2,677 4,909 9,958
Gain (Loss) on Derivatives, Net 0 0 0 0
Energy contracts [Member]        
Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract]        
Brokergage and Trading Revenue 5,994 10,386 23,797 26,870
Gain (Loss) on Derivatives, Net 0 0 0 0
Foreign exchange contracts [Member]        
Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract]        
Brokergage and Trading Revenue 61 116 145 422
Gain (Loss) on Derivatives, Net 0 0 0 0
Equity option contracts [Member]        
Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract]        
Brokergage and Trading Revenue 0 0 0 0
Gain (Loss) on Derivatives, Net 0 0 0 0
Trading [Member]        
Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract]        
Brokergage and Trading Revenue 21,511 [1] 52,373 [1] 22,590 [2] 68,071 [2]
Gain (Loss) on Derivatives, Net 0 [1] 0 [1] 0 [2] 0 [2]
Internal risk management programs [Member]        
Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract]        
Brokergage and Trading Revenue 0 0 0 0
Gain (Loss) on Derivatives, Net $ (9,010) $ (17,009) $ (18,513) $ (77,559)
[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 Brokerage and Trading Revenue in the Consolidated Statements of Earnings.
[2] 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 Brokerage and Trading Revenue in the Consolidated Statements of Earnings