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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract]        
Brokergage and Trading Revenue $ 61,136 $ 38,819 $ (7,531) $ 1,386
Gain (Loss) on Derivatives, Net 18,820 21,885 (8,830) 40,305
Total customer risk management programs        
Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract]        
Brokergage and Trading Revenue 1,805 6,242 4,397 9,464
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 1,016 746 2,404 1,688
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 594 5,383 1,614 7,390
Gain (Loss) on Derivatives, Net 0 0 0 0
Agricultural contracts [Member]        
Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract]        
Brokergage and Trading Revenue 10 6 28 21
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 185 107 351 365
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 59,331 [1] 32,577 [1] (11,928) [2] (8,078) [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 $ 18,820 $ 21,885 $ (8,830) $ 40,305
[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.