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Business Developments, Special Charges, Including Business Realignment Costs, and Intangible Asset Amortization (Details) $ in Thousands, $ in Thousands			3 Months Ended		9 Months Ended
	Jul. 02, 2020 USD ($)	Jul. 02, 2020 MXN ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2020
Business Acquisition [Line Items]
Gain (Loss) on Disposition of Business					$ 0	$ 1,355
Special Charges, Including Business Realignment Costs			$ 8,554	$ 7,380	8,554	39,614
Headcount Reductions (as a percent)							8.00%
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
Investment Banking [Member]
Business Acquisition [Line Items]
Special Charges, Including Business Realignment Costs			0	7,380	0	39,582
Amortization of Intangible Assets				169		1,183
Investment Management [Member]
Business Acquisition [Line Items]
Special Charges, Including Business Realignment Costs			8,554	0	8,554	32
Amortization of Intangible Assets			$ 90	105	$ 272	318
Other Revenue, Including Interest and Investments [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | ECB Trust Business [Member]
Business Acquisition [Line Items]
Gain (Loss) on Disposition of Business				1,355		1,355
Special Charges [Member]
Business Acquisition [Line Items]
Restructuring Charges				7,253		37,558
Accelerated Depreciation For Leasehold Improvements				$ 127		$ 2,056

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