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Derivatives, Derivatives Instruments Gain (Loss) in Income Statement (Details) - Not Designated as Hedging Instrument [Member] - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Trading Activity, Gains and Losses, Net [Line Items]      
Brokerage and Trading Revenue $ 31,004 $ 32,940 $ 25,192
Gain (Loss) on Derivatives, Net 42,320 14,951 (442)
To-be-announced residential mortgage-backed securities [Member]      
Trading Activity, Gains and Losses, Net [Line Items]      
Brokerage and Trading Revenue [1] 0 9,579 27,190
Gain (Loss) on Derivatives, Net [1] 0 0 0
Interest rate swaps [Member]      
Trading Activity, Gains and Losses, Net [Line Items]      
Brokerage and Trading Revenue 4,507 3,647 2,614
Gain (Loss) on Derivatives, Net 0 0 0
Energy contracts [Member]      
Trading Activity, Gains and Losses, Net [Line Items]      
Brokerage and Trading Revenue 17,287 5,064 8,443
Gain (Loss) on Derivatives, Net 0 0 0
Agricultural contracts [Member]      
Trading Activity, Gains and Losses, Net [Line Items]      
Brokerage and Trading Revenue 34 28 53
Gain (Loss) on Derivatives, Net 0 0 0
Foreign exchange contracts [Member]      
Trading Activity, Gains and Losses, Net [Line Items]      
Brokerage and Trading Revenue 921 623 535
Gain (Loss) on Derivatives, Net 0 0 0
Equity option contracts [Member]      
Trading Activity, Gains and Losses, Net [Line Items]      
Brokerage and Trading Revenue 0 0 0
Gain (Loss) on Derivatives, Net 0 0 0
Total customer risk management programs [Member]      
Trading Activity, Gains and Losses, Net [Line Items]      
Brokerage and Trading Revenue 22,749 18,941 38,835
Gain (Loss) on Derivatives, Net 0 0 0
Trading [Member]      
Trading Activity, Gains and Losses, Net [Line Items]      
Brokerage and Trading Revenue [2] 8,255 13,999 (13,643)
Gain (Loss) on Derivatives, Net [2] 0 0 0
Internal risk management programs [Member]      
Trading Activity, Gains and Losses, Net [Line Items]      
Brokerage and Trading Revenue 0 0 0
Gain (Loss) on Derivatives, Net $ 42,320 $ 14,951 $ (442)
[1] To-be-announced U.S. agency residential mortgage-backed securities customer hedging program transitioned to trading program during 2019.
[2] Includes changes in fair value of to-be-announced U.S. agency residential mortgage-backed securities and other derivative instruments offered to mortgage banking customers to manage their market risk or 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 Statement of Earnings.