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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Trading Activity, Gains and Losses, Net [Line Items] |  |  |
Brokerage and Trading Revenue | $ 32,940 | $ 25,192 | $ 48,761
Gain (Loss) on Derivatives, Net | 14,951 | (422) | 779
To-be-announced residential mortgage-backed securities [Member] |  |  |
Trading Activity, Gains and Losses, Net [Line Items] |  |  |
Brokerage and Trading Revenue | 9,579 | 27,190 | 34,532
Gain (Loss) on Derivatives, Net | 0 | 0 | 0
Interest rate swaps [Member] |  |  |
Trading Activity, Gains and Losses, Net [Line Items] |  |  |
Brokerage and Trading Revenue | 3,647 | 2,614 | 2,647
Gain (Loss) on Derivatives, Net | 0 | 0 | 0
Energy contracts [Member] |  |  |
Trading Activity, Gains and Losses, Net [Line Items] |  |  |
Brokerage and Trading Revenue | 5,064 | 8,443 | 5,536
Gain (Loss) on Derivatives, Net | 0 | 0 | 0
Agricultural contracts [Member] |  |  |
Trading Activity, Gains and Losses, Net [Line Items] |  |  |
Brokerage and Trading Revenue | 28 | 53 | 79
Gain (Loss) on Derivatives, Net | 0 | 0 | 0
Foreign exchange contracts [Member] |  |  |
Trading Activity, Gains and Losses, Net [Line Items] |  |  |
Brokerage and Trading Revenue | 623 | 535 | 1,352
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 | 18,941 | 38,835 | 44,146
Gain (Loss) on Derivatives, Net | 0 | 0 | 0
Trading [Member] |  |  |
Trading Activity, Gains and Losses, Net [Line Items] |  |  |
Brokerage and Trading Revenue | 13,999 | (13,643) | 4,615
Gain (Loss) on Derivatives, Net | 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 | $ 14,951 | $ (422) | $ 779

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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=109980867&loc=SL5618551-113959 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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=109980867&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=116637391&loc=SL114874048-224260 + Details
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