Derivatives, Derivatives Instruments Gain (Loss) in Income Statement (Details) - Not Designated as Hedging Instrument [Member] - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Trading Activity, Gains and Losses, Net [Line Items]
Brokerage and Trading Revenue		$ 8,979	$ 31,004	$ 32,940
Gain (Loss) on Derivatives, Net		(19,378)	42,320	14,951
To-be-announced residential mortgage-backed securities [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Brokerage and Trading Revenue	[1]	0	0	9,579
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		5,503	4,507	3,647
Gain (Loss) on Derivatives, Net		0	0	0
Energy contracts [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Brokerage and Trading Revenue		14,190	17,287	5,064
Gain (Loss) on Derivatives, Net		0	0	0
Agricultural contracts [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Brokerage and Trading Revenue		27	34	28
Gain (Loss) on Derivatives, Net		0	0	0
Foreign exchange contracts [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Brokerage and Trading Revenue		712	921	623
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		20,432	22,749	18,941
Gain (Loss) on Derivatives, Net		0	0	0
Trading [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Brokerage and Trading Revenue	[2]	(11,453)	8,255	13,999
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		$ (19,378)	$ 42,320	$ 14,951

[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.