Derivatives, Derivatives Instruments Gain (Loss) in Income Statement (Details) - Not Designated as Hedging Instrument [Member] - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Trading Activity, Gains and Losses, Net [Line Items]
Brokerage and Trading Revenue		$ (102,713)	$ 94,332	$ 8,979
Gain (Loss) on Derivatives, Net		(9,921)	(73,011)	(19,378)
Total customer risk management programs [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Brokerage and Trading Revenue		36,522	45,716	20,432
Gain (Loss) on Derivatives, Net		0	0	0
Interest rate contracts [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Brokerage and Trading Revenue		5,531	10,690	5,503
Gain (Loss) on Derivatives, Net		0	0	0
Energy contracts [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Brokerage and Trading Revenue		30,715	34,435	14,190
Gain (Loss) on Derivatives, Net		0	0	0
Agricultural contracts [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Brokerage and Trading Revenue		0	0	27
Gain (Loss) on Derivatives, Net		0	0	0
Foreign exchange contracts [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Brokerage and Trading Revenue		276	591	712
Gain (Loss) on Derivatives, Net		0	0	0
Trading [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Brokerage and Trading Revenue	[1]	(139,235)	48,616	(11,453)
Gain (Loss) on Derivatives, Net	[1]	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		$ (9,921)	$ (73,011)	$ (19,378)

[1] 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 Statements of Earnings.