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Business Developments, Special Charges, Including Business Realignment Costs, and Intangible Asset Amortization (Details) $ in Thousands, $ in Thousands |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jul. 02, 2020 USD ($) | Jul. 02, 2020 MXN ($) | Apr. 30, 2020 MXN ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from Sale of Business |  |  | $ 35,000 |  |  | $ 1,830 | $ 0 |  |
Gain (Loss) on Disposition of Business |  |  |  |  |  | 1,355 | 0 |  |
Special Charges, Including Business Realignment Costs |  |  |  | $ 7,380 | $ 1,029 | $ 39,614 | 3,087 |  |
Headcount Reductions (as a percent) |  |  |  | 8.00% |  | 8.00% |  |  |
Special Charges [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Restructuring Charges |  |  |  | $ 7,253 |  | $ 37,558 |  |  | $ 2,850
Accelerated Depreciation For Leasehold Improvements |  |  |  | 127 |  | 2,056 |  |  |
Investment Banking [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Special Charges, Including Business Realignment Costs |  |  |  | 7,380 | 1,029 | 39,582 | 3,087 |  |
Amortization of Intangible Assets |  |  |  | 169 | 2,190 | 1,183 | 6,570 |  |
Investment Management [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Special Charges, Including Business Realignment Costs |  |  |  | 0 | 0 | 32 | 0 |  |
Amortization of Intangible Assets |  |  |  | 105 | $ 109 | $ 318 | $ 328 |  |
Forecast [Member] | Special Charges [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Restructuring Charges |  |  |  |  |  |  |  | $ 43,000 |
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | ECB Trust Business [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from Sale of Business | $ 1,830 | $ 39,500 |  |  |  |  |  |  |
Value of Assets Deconsolidated | $ 475 |  |  |  |  |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | ECB Trust Business [Member] | Other Revenue, Including Interest and Investments [Member] |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Gain (Loss) on Disposition of Business |  |  |  | $ 1,355 |  |  |  |  |

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