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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
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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.

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5618551-113959 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4F -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5624186-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 35 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=35711043&loc=d3e42454-110968 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=35711157&loc=d3e42567-110969 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(e)) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 + Details
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