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Collateralized Transactions - Schedule of Gross Amounts and Offsetting Amounts of Reverse Repurchase Agreements, Repurchase Agreements, Securities Borrowed and Securities Lending Transactions (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Reverse repurchase agreements |  |
Gross Amounts of Recognized Assets | $ 320,669 | $ 88,349
Gross Amounts Offset on the Balance Sheet | (294,732) | (88,349)
Net Amounts of Assets Presented on the Balance Sheet | 25,937 | 0
Financial Instruments | (25,937) | 0
Cash Collateral Received | 0 | 0
Net Amount | 0 | 0
Securities borrowed |  |
Gross Amounts of Recognized Assets | 109,763 | 110,932
Gross Amounts Offset on the Balance Sheet | 0 | 0
Net Amounts of Assets Presented on the Balance Sheet | 109,763 | 110,932
Financial Instruments | (107,957) | (109,922)
Cash Collateral Received | 0 | 0
Net Amount | 1,806 | 1,010
Total |  |
Gross Amounts of Recognized Assets | 430,432 | 199,281
Gross Amounts Offset on the Balance Sheet | (294,732) | (88,349)
Net Amounts of Assets Presented on the Balance Sheet | 135,700 | 110,932
Financial Instruments | (133,894) | (109,922)
Cash Collateral Received | 0 | 0
Net Amount | 1,806 | 1,010
Repurchase agreements |  |
Gross Amounts of Recognized Liabilities | 301,882 | 430,787
Gross Amounts Offset on the Balance Sheet | (294,732) | (88,349)
Net Amounts of Liabilities Presented on the Balance Sheet | 7,150 | 342,438
Financial Instruments | 0 | (340,632)
Cash Collateral Pledged | 0 | 0
Net Amount | 7,150 | 1,806
Securities loaned |  |
Gross Amounts of Recognized Liabilities | 257,342 | 249,499
Gross Amounts Offset on the Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented on the Balance Sheet | 257,342 | 249,499
Financial Instruments | (253,320) | (242,318)
Cash Collateral Pledged | 0 | 0
Net Amount | 4,022 | 7,181
Total |  |
Gross Amounts of Recognized Liabilities | 559,224 | 680,286
Gross Amounts Offset on the Balance Sheet | (294,732) | (88,349)
Net Amounts of Liabilities Presented on the Balance Sheet | 264,492 | 591,937
Financial Instruments | (253,320) | (582,950)
Cash Collateral Pledged | 0 | 0
Net Amount | $ 11,172 | $ 8,987

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