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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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract]        
Brokergage and Trading Revenue $ 16,882 $ 8,174 $ 9,351 $ 9,560
Gain (Loss) on Derivatives, Net (5,760) 2,354 (14,590) 42,659
Total customer risk management programs        
Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract]        
Brokergage and Trading Revenue 6,930 8,642 11,327 18,106
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 1,283 1,014 3,687 2,702
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 5,528 7,460 7,142 14,850
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 (1) 6 27 27
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 120 162 471 527
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 9,952 [1] (468) [1] (1,976) [2] (8,546) [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 $ (5,760) $ 2,354 $ (14,590) $ 42,659
[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.