Investment Securities and Certificates of Deposit - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Schedule Of Marketable Securities [Line Items]
Other Payables to Broker-Dealers and Clearing Organizations	$ 99,983
Certificates of Deposit, at Carrying Value	0	$ 214,796
Debt Securities [Member]
Schedule Of Marketable Securities [Line Items]
Investment Securities, Realized Gains (Losses)	75	(14)	$ (28)
Equity Securities [Member]
Schedule Of Marketable Securities [Line Items]
Investment Securities, Realized and Unrealized Gains (Losses)	95	243	(193)
Debt Securities Carried by Broker-Dealers [Member]
Schedule Of Marketable Securities [Line Items]
Investment Securities, Realized and Unrealized Gains (Losses)	(1,216)	491	546
Debt Securities, Trading	550,026	227,355
Debt Securities Carried by Broker-Dealers [Member] \| US Treasury Bill Securities [Member]
Schedule Of Marketable Securities [Line Items]
Debt Securities, Trading	99,983
Investment Funds [Member]
Schedule Of Marketable Securities [Line Items]
Investment Securities, Realized and Unrealized Gains (Losses)	$ 16,913	$ 13,785	$ (5,113)

Schedule Of Marketable Securities [Line Items]

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- Definition

A savings certificate entitling the Entity (that is, bearer) to receive interest at an established maturity date, based upon a fixed interest rate. A certificate of deposit may be issued in any denomination. Certificates of deposit are generally issued by commercial banks and, therefore, insured by the FDIC (up to the prescribed limit). Certificates of deposit generally restrict holders from withdrawing funds on demand without the incurrence of penalties. Generally, only certificates of deposit with original maturities of three months or less qualify as cash equivalents. Original maturity means original maturity to the entity holding the investment. As a related example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.1)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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- Definition

Amount of unrealized and realized gain (loss) on investment in marketable security, including other-than-temporary impairment (OTTI).

+ References

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Amount of realized gain (loss) on investment in marketable security, including other-than-temporary impairment (OTTI).

+ References

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Amount of other payables due to broker-dealers or clearing organizations.

+ References

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- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26610-111562

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26610-111562

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