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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 | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Reverse repurchase agreements |  |
Gross Amounts of Recognized Assets | $ 191,463 | $ 55,927
Gross Amounts Offset on the Balance Sheet | (191,463) | (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 | 128,199 | 99,635
Gross Amounts Offset on the Balance Sheet | 0 | 0
Net Amounts of Assets Presented on the Balance Sheet | 128,199 | 99,635
Financial Instruments | (126,755) | (97,702)
Cash Collateral Received | 0 | 0
Net Amount | 1,444 | 1,933
Total |  |
Gross Amounts of Recognized Assets | 319,662 | 155,562
Gross Amounts Offset on the Balance Sheet | (191,463) | (55,927)
Net Amounts of Assets Presented on the Balance Sheet | 128,199 | 99,635
Financial Instruments | (126,755) | (97,702)
Cash Collateral Received | 0 | 0
Net Amount | 1,444 | 1,933
Repurchase agreements |  |
Gross Amounts of Recognized Liabilities | 444,290 | 343,192
Gross Amounts Offset on the Balance Sheet | (191,463) | (55,927)
Net Amounts of Liabilities Presented on the Balance Sheet | 252,827 | 287,265
Financial Instruments | (250,619) | (285,264)
Cash Collateral Pledged | 0 | 0
Net Amount | 2,208 | 2,001
Securities loaned |  |
Gross Amounts of Recognized Liabilities | 291,969 | 234,343
Gross Amounts Offset on the Balance Sheet | 0 | 0
Net Amounts of Liabilities Presented on the Balance Sheet | 291,969 | 234,343
Financial Instruments | (284,998) | (228,548)
Cash Collateral Pledged | 0 | 0
Net Amount | 6,971 | 5,795
Total |  |
Gross Amounts of Recognized Liabilities | 736,259 | 577,535
Gross Amounts Offset on the Balance Sheet | (191,463) | (55,927)
Net Amounts of Liabilities Presented on the Balance Sheet | 544,796 | 521,608
Financial Instruments | (535,617) | (513,812)
Cash Collateral Pledged | 0 | 0
Net Amount | $ 9,179 | $ 7,796

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