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Investment Securities and Certificates of Deposit - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Schedule Of Marketable Securities [Line Items] |  |  |  |  |
Other Payables to Broker-Dealers and Clearing Organizations |  |  |  |  | $ 99,983
Certificates of Deposit, at Carrying Value | $ 122,510 |  | $ 122,510 |  | 0
Certificates of Deposit |  |  |  |  |
Schedule Of Marketable Securities [Line Items] |  |  |  |  |
Cash and Cash Equivalents Maturity |  |  | 4 months |  |
Debt Securities [Member] |  |  |  |  |
Schedule Of Marketable Securities [Line Items] |  |  |  |  |
Investment Securities, Realized Gains (Losses) |  | $ 77 | $ (11) | $ 73 |
Equity Securities [Member] |  |  |  |  |
Schedule Of Marketable Securities [Line Items] |  |  |  |  |
Investment Securities, Realized and Unrealized Gains (Losses) | (267) | 88 | 1,860 | (246) |
Debt Securities Carried by Broker-Dealers [Member] |  |  |  |  |
Schedule Of Marketable Securities [Line Items] |  |  |  |  |
Investment Securities, Realized and Unrealized Gains (Losses) | (4) | (1,111) | (9) | (1,240) |
Debt Securities, Trading | 519,888 |  | 519,888 |  | 550,026
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) | $ 9,774 | $ 10,284 | $ 16,002 | $ (2,790) |

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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 + Details
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