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Investment Securities and Certificates of Deposit - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Schedule Of Marketable Securities [Line Items] |  |  |  |  |
Debt Securities, Available-for-Sale, Unrealized Gain |  |  | $ 130 |  | $ 141
Debt Securities, Available-for-Sale, Unrealized Loss |  |  | (26) |  | (4)
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, before Tax | $ 125 | $ 21 | (32) | $ 21 |
Debt Securities, Available-for-Sale, Realized Loss |  |  | (47) | (261) |
Proceeds from Sale and Maturity of Debt Securities, Available-for-Sale | 187,000 | 250,000 | 934,511 | 1,493,992 |
Certificates of Deposit, at contract value | 97,676 |  | $ 97,676 |  | $ 54,856
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] |  |  |  |  |
Marketable Security, Gain (Loss) | (1) | (286) | $ (122) | (63) |
Debt Securities Carried By EGL [Member] |  |  |  |  |
Schedule Of Marketable Securities [Line Items] |  |  |  |  |
Marketable Security, Gain (Loss) | 295 | 129 | 210 | 147 |
Investment Funds [Member] |  |  |  |  |
Schedule Of Marketable Securities [Line Items] |  |  |  |  |
Marketable Security, Gain (Loss) | 9,106 | (5,541) | 30,217 | 15,515 |
Investment Securities, Unrealized Gain (Loss) | $ 8,836 | $ (5,541) | $ 19,515 | $ 10,709 |

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- Definition 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 -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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- Definition Amount of unrealized loss 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 (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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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://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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