Accelerated Depreciation For Leasehold Improvements

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Special Charges incurred related to the impairment of intangible assets, Special Charges incurred in connection with exiting facilities and Special Charges related to acquisitions, including the exiting of facilities for office space, introducing fees as well as other professional fees

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Value of Assets Deconsolidated

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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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.

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Amount of gain (loss) from sale and disposal of integrated set of activities and assets capable of being conducted and managed for purpose of providing return in form of dividend, lower cost, or other economic benefit to investor, owner, member and participant.

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The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

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Percentage of the total number of positions eliminated as of the balance sheet date since inception of the restructuring plan(s).

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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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