Investment Securities and Certificates of Deposit - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Schedule Of Marketable Securities [Line Items]
Debt Securities, Available-for-Sale, Unrealized Gain	$ 419	$ 6,760	$ 29
Debt Securities, Available-for-Sale, Unrealized Loss	(280)	(2,301)	(36)
Debt Securities, Available-for-Sale, Realized Loss	(261)	(34)	(11)
Proceeds from Sale and Maturity of Debt Securities, Available-for-Sale	1,772,642	1,415,291	814,800
Certificates of Deposit, at Carrying Value	$ 54,856	122,890
Certificates of Deposit
Schedule Of Marketable Securities [Line Items]
Cash and Cash Equivalents Maturity	4 months
Equity Securities [Member]
Schedule Of Marketable Securities [Line Items]
Investment Securities, Realized and Unrealized Gains (Losses)	$ 41	(525)	1,156
Debt Securities Carried By EGL [Member]
Schedule Of Marketable Securities [Line Items]
Investment Securities, Realized and Unrealized Gains (Losses)	216	1,777	6
Investment Funds [Member]
Schedule Of Marketable Securities [Line Items]
Investment Securities, Realized and Unrealized Gains (Losses)	31,724	(29,778)	29,025
Investment Securities, Unrealized Gain (Loss)	$ 26,342	$ (45,619)	$ 19,470

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Schedule Of Marketable Securities [Line Items]

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Amount of unrealized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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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://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
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Amount of unrealized and realized gain (loss) on investment in marketable security, including other-than-temporary impairment (OTTI).

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Amount of cash inflow from sale, maturity, prepayment and call of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
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