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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 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract]        
Brokergage and Trading Revenue $ 39,341 $ 77,814 $ 129,372 $ 23,075
Gain (Loss) on Derivatives, Net (1,091) (8,159) (9,724) (9,503)
Total customer risk management programs        
Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract]        
Brokergage and Trading Revenue 6,765 13,642 13,090 21,996
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 547 2,339 3,007 4,109
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 6,162 11,250 9,977 17,803
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 56 53 106 84
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 32,576 [1] 64,172 [1] 116,282 [2] 1,079 [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 $ (1,091) $ (8,159) $ (9,724) $ (9,503)
[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]
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.