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Business Changes and Developments (Details) $ in Thousands, $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Dec. 16, 2020 USD ($) | Dec. 16, 2020 MXN ($) | Jul. 02, 2020 USD ($) | Jul. 02, 2020 MXN ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |
Net Loss on Sale and Wind-down of Operations in Mexico, Including Release of Cumulative Foreign Exchange Losses |  |  |  |  | $ 35,247 | $ 0 | $ 0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  |  |  | 20,337 |  |
Operating Lease, Impairment Loss |  |  |  |  | 1,176 |  |
Amortization of Intangible Assets |  |  |  |  | 1,605 | 8,077 | 9,199
Impairment of Goodwill |  |  |  |  | 0 | 2,921 | $ 0
Goodwill, Impairment Loss, Net of Tax |  |  |  |  |  | 1,361 |
Reclassification from Noncontrolling Interest, Current Period, Net of Tax |  |  |  |  | 7,028 |  |
Leasehold Improvements |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Asset Impairment Charges |  |  |  |  | 480 |  |
Asset impairment charges |  |  |  |  | 480 |  |
Annual Goodwill Assessment [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill, Impairment Loss, Net of Tax |  |  |  |  |  | 543 |
Special Charges [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Asset Impairment Charges |  |  |  |  | 1,656 |  |
Asset impairment charges |  |  |  |  | 1,656 |  |
Impairment of Goodwill |  |  |  |  |  | 2,921 |
Investment Management [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Net Loss on Sale and Wind-down of Operations in Mexico, Including Release of Cumulative Foreign Exchange Losses |  |  |  |  | 3,441 |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  |  |  | 6,295 |  |
Investment Management [Member] | Special Charges [Member] | Institutional Asset Management [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Impairment of Goodwill |  |  |  |  |  | 2,088 |
Investment Management [Member] | Special Charges [Member] | Annual Goodwill Assessment [Member] | Institutional Asset Management [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Impairment of Goodwill |  |  |  |  |  | $ 833 |
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | ECB Trust Business [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Proceeds from Sale of Business, Net of Cash Sold |  |  | $ 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] |  |  |  |  |  |  |
Net Loss on Sale and Wind-down of Operations in Mexico, Including Release of Cumulative Foreign Exchange Losses |  |  |  |  | (1,355) |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | ECB Business [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Proceeds from Sale of Business, Net of Cash Sold | $ 1,634 | $ 35,000 |  |  |  |  |
Value of Assets Deconsolidated | 32,487 |  |  |  |  |  |
Value of Liabilities Deconsolidated | 26,519 |  |  |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | ECB Business [Member] | Financial Instruments Owned And Pledged As Collateral At Fair Value [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Value of Assets Deconsolidated | 24,742 |  |  |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | ECB Business [Member] | Investment Securities [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Value of Assets Deconsolidated | 3,317 |  |  |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | ECB Business [Member] | Cash and Cash Equivalents and Restricted Cash [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Value of Assets Deconsolidated | 2,785 |  |  |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | ECB Business [Member] | Securities Sold under Agreements to Repurchase [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Value of Liabilities Deconsolidated | $ 24,764 |  |  |  |  |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | ECB Business [Member] | Other Revenue, Including Interest and Investments [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Net Loss on Sale and Wind-down of Operations in Mexico, Including Release of Cumulative Foreign Exchange Losses |  |  |  |  | $ 4,796 |  |

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