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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
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract] |  |  |  |  |  |  |  |
Brokergage and Trading Revenue | $ 49,470 |  | $ (4,244) |  | $ (35,030) |  | $ 125,128 |
Gain (Loss) on Derivatives, Net | (453) |  | 8,991 |  | 14,647 |  | (733) |
Total customer risk management programs |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract] |  |  |  |  |  |  |  |
Brokergage and Trading Revenue | 5,715 |  | 7,425 |  | 21,614 |  | 20,515 |
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 | 1,339 |  | 1,606 |  | 2,975 |  | 4,613 |
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 | 4,351 |  | 5,612 |  | 18,551 |  | 15,589 |
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 | 25 |  | 207 |  | 88 |  | 313 |
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 | 43,755 | [1] | (11,669) | [1] | (56,644) | [2] | 104,613 | [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 | $ (453) |  | $ 8,991 |  | $ 14,647 |  | $ (733) |
[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 Other operating revenue - 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 Other operating revenue - Brokerage and trading revenue in the Consolidated Statements of Earnings.

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name Accounting Standards Codification -Section 55 -Paragraph 10 -SubTopic 10 -Topic 825 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482881/825-10-55-10 + Details
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- Definition Amount of gain (loss) resulting from the difference between the acquisition price and the selling price or fair value of trading assets and trading liabilities, conducted separately from customer trading activities. Includes, but is not limited to, changes in fair value of trading assets and trading liabilities. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 184 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480401/815-10-55-184 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4F -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4F Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4F -Subparagraph (a)(5) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4F Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4F -Subparagraph (a)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4F Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4F -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4F Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4F -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4F Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4F -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4F Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4F -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4F Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 940 -SubTopic 320 -Name Accounting Standards Codification -Section 45 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479035/940-320-45-5 Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(13)(e)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1 + Details
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