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v3.20.1

Collateralized Transactions - Additional Information (Narrative) (Details) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 USD ($) dealer | Dec. 31, 2019 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Gross Amounts of Recognized Liabilities | $ 135,870,000 | $ 343,192,000
Gross Amounts of Recognized Liabilities | 181,745,000 | 234,343,000
Bank call loans | 203,100,000 | 0
Customer Securities for which Entity has Right to Sell or Repledge, Fair Value | 1,300,000,000 |
Customer securities under customer margin loans agreement available to be repledged | 149,400,000 |
Outstanding letters of credit | 0 |
Amounts pledged | 150,547,000 | 357,120,000
Carrying value of securities owned by the Company loaned or pledged | $ 31,700,000 | 171,400,000
Number of broker-dealers | dealer | 4 |
Receivable from brokers and clearing organizations | $ 80,200,000 |
Securities Sold under Agreements to Repurchase, Asset | 11,767,000 | 55,927,000
Securities Sold under Agreements to Repurchase, Amount Not Offset Against Collateral | 124,103,000 | 287,265,000
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities | 123,506,000 | 285,264,000
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Cash | 0 | 0
Securities Sold under Agreements to Repurchase, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election | 597,000 | 2,001,000
Securities Loaned, Asset | 0 | 0
Securities Loaned, Amount Not Offset Against Collateral | 181,745,000 | 234,343,000
Securities Loaned, Collateral, Right to Reclaim Securities | 174,038,000 | 228,548,000
Securities Loaned, Collateral, Right to Reclaim Cash | 0 | 0
Securities Loaned, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election | 7,707,000 | 5,795,000
Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Gross | 317,615,000 | 577,535,000
Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Asset | 11,767,000 | 55,927,000
Derivative Liability, Securities Sold under Agreements to Resell, Securities Loaned, Amount Not Offset Against Collateral | 305,848,000 | 521,608,000
Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Collateral, Right to Reclaim Securities | 297,544,000 | 513,812,000
Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Collateral, Right to Reclaim Cash | 0 | 0
Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election | 8,304,000 | 7,796,000
Reverse Repurchase Agreements |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Securities received as collateral under securities borrowed transaction with market value | 11,800,000 | 55,800,000
Securities Loaned [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Customer securities under customer margin loans agreement available to be repledged | 22,200,000 | 19,300,000
Repurchase Agreements [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Customer securities under customer margin loans agreement available to be repledged | 11,800,000 | 55,800,000
Securities Borrowed Transactions |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Securities received as collateral under securities borrowed transaction with market value | 98,900,000 | $ 96,300,000
Maturity Overnight and on Demand [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Securities Loaned and Securities Sold under Agreement to Repurchase, Gross Including Not Subject to Master Netting Arrangement | $ 317,615,000 |
Minimum [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Number of business days for related transactions | 1 day |
Maximum [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Number of business days for related transactions | 2 days |
Options Clearing Corporation [Domain] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Customer securities under customer margin loans agreement available to be repledged | $ 484,900,000 |

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