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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 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Reverse repurchase agreements |  |  |  |  |
Gross Amounts of Recognized Assets |  | $ 88,349 |  | $ 55,927 |
Gross Amounts Offset on the Balance Sheet |  | (88,349) |  | (55,927) |
Net Amounts of Assets Presented on the Balance Sheet |  | 0 |  | 0 |
Financial Instruments |  | 0 |  | 0 |
Cash Collateral Received |  | 0 |  | 0 |
Net Amount |  | 0 |  | 0 |
Securities borrowed |  |  |  |  |
Gross Amounts of Recognized Assets |  | 110,932 | [1] | 99,635 | [2]
Gross Amounts Offset on the Balance Sheet |  | 0 | [1] | 0 | [2]
Securities Borrowed, Amount Not Offset Against Collateral | [2] |  |  | 99,635 |
Net Amounts of Assets Presented on the Balance Sheet |  | 110,932 |  | 99,635 |
Financial Instruments |  | (109,922) | [1] | (97,702) | [2]
Cash Collateral Received |  | 0 | [1] | 0 | [2]
Net Amount |  | 1,010 | [1] | 1,933 | [2]
Total |  |  |  |  |
Gross Amounts of Recognized Assets |  | 199,281 |  | 155,562 |
Gross Amounts Offset on the Balance Sheet |  | (88,349) |  | (55,927) |
Net Amounts of Assets Presented on the Balance Sheet |  | 110,932 |  | 99,635 |
Financial Instruments |  | (109,922) |  | (97,702) |
Cash Collateral Received |  | 0 |  | 0 |
Net Amount |  | 1,010 |  | 1,933 |
Repurchase agreements |  |  |  |  |
Gross Amounts of Recognized Liabilities |  |  |  | 343,192 |
Gross Amounts Offset on the Balance Sheet |  | (88,349) |  | (55,927) |
Securities Sold under Agreements to Repurchase, Amount Not Offset Against Collateral |  |  |  | 287,265 |
Net Amounts of Liabilities Presented on the Balance Sheet |  | 342,438 |  | 287,265 |
Financial Instruments |  | (340,632) |  | (285,264) |
Cash Collateral Pledged |  | 0 |  | 0 |
Net Amount |  | 1,806 |  | 2,001 |
Securities loaned |  |  |  |  |
Gross Amounts of Recognized Liabilities | [3] |  |  | 234,343 |
Gross Amounts Offset on the Balance Sheet |  | 0 |  | 0 | [3]
Securities Loaned, Amount Not Offset Against Collateral | [3] |  |  | 234,343 |
Net Amounts of Liabilities Presented on the Balance Sheet |  | 249,499 |  | 234,343 |
Financial Instruments |  | (242,318) |  | (228,548) | [3]
Cash Collateral Pledged |  | 0 |  | 0 | [3]
Net Amount |  | 7,181 |  | 5,795 | [3]
Total |  |  |  |  |
Gross Amounts of Recognized Liabilities |  | 680,286 |  | 577,535 |
Gross Amounts Offset on the Balance Sheet |  | (88,349) |  | (55,927) |
Net Amounts of Liabilities Presented on the Balance Sheet |  | 591,937 |  | 521,608 |
Financial Instruments |  | (582,950) |  | (513,812) |
Cash Collateral Pledged |  | 0 |  | 0 |
Net Amount |  | 8,987 |  | $ 7,796 |
U.S. treasury, agency and sovereign obligations | Maturity Overnight and on Demand [Member] |  |  |  |  |
Repurchase agreements |  |  |  |  |
Gross Amounts of Recognized Liabilities |  | 430,787 |  |  |
Equity Securities [Member] | Maturity Overnight and on Demand [Member] |  |  |  |  |
Securities loaned |  |  |  |  |
Gross Amounts of Recognized Liabilities |  | $ 249,499 |  |  |
[1] | (1) Included in receivable from brokers, dealers and clearing organizations on the consolidated balance sheet.
|  |  |  |  |  |  | Gross Amounts Not Offset on the Balance Sheet |  |
| Gross Amounts of Recognized Liabilities |  | Gross Amounts Offset on the Balance Sheet |  | Net Amounts of Liabilities Presented on the Balance Sheet |  | Financial Instruments |  | Cash Collateral Pledged |  | Net Amount
Repurchase agreements | $ | 430,787 |  |  | $ | (88,349) |  |  | $ | 342,438 |  |  | $ | (340,632) |  |  | $ | — |  |  | $ | 1,806 |
Securities loaned (2) | 249,499 |  |  | — |  |  | 249,499 |  |  | (242,318) |  |  | — |  |  | 7,181 |
Total | $ | 680,286 |  |  | $ | (88,349) |  |  | $ | 591,937 |  |  | $ | (582,950) |  |  | $ | — |  |  | $ | 8,987 |
(2) Included in payable to brokers, dealers and clearing organizations on the consolidated balance she
[2] | (1) Included in receivable from brokers, dealers and clearing organizations on the consolidated balance sheet.
|  |  |  |  |  |  | Gross Amounts Not Offset on the Balance Sheet |  |
| Gross Amounts of Recognized Liabilities |  | Gross Amounts Offset on the Balance Sheet |  | Net Amounts of Liabilities Presented on the Balance Sheet |  | Financial Instruments |  | Cash Collateral Pledged |  | Net Amount
Repurchase agreements | $ | 343,192 |  |  | $ | (55,927) |  |  | $ | 287,265 |  |  | $ | (285,264) |  |  | $ | — |  |  | $ | 2,001 |
Securities loaned (2) | 234,343 |  |  | — |  |  | 234,343 |  |  | (228,548) |  |  | — |  |  | 5,795 |
Total | $ | 577,535 |  |  | $ | (55,927) |  |  | $ | 521,608 |  |  | $ | (513,812) |  |  | $ | — |  |  | $ | 7,796 |
[3] | (2) Included in payable to brokers, dealers and clearing organizations on the consolidated balance sheet.

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