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v3.21.1

Collateralized Transactions - Additional Information (Narrative) (Details) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 USD ($) dealer | Dec. 31, 2020 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Gross Amounts of Recognized Liabilities | $ 301,882,000 | $ 430,787,000
Gross Amounts of Recognized Liabilities | 257,342,000 | 249,499,000
Bank call loans | 75,100,000 | 82,000,000
Amounts pledged | $ 336,488,000 | 440,531,000
Number of broker-dealers | dealer | 3 |
Receivable from brokers and clearing organizations | $ 72,600,000 |
Securities Sold under Agreements to Repurchase, Asset | 294,732,000 | 88,349,000
Securities Sold under Agreements to Repurchase, Amount Not Offset Against Collateral | 7,150,000 | 342,438,000
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities | 0 | 340,632,000
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 | 7,150,000 | 1,806,000
Securities Loaned, Asset | 0 | 0
Securities Loaned, Amount Not Offset Against Collateral | 257,342,000 | 249,499,000
Securities Loaned, Collateral, Right to Reclaim Securities | 253,320,000 | 242,318,000
Securities Loaned, Collateral, Right to Reclaim Cash | 0 | 0
Securities Loaned, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election | 4,022,000 | 7,181,000
Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Gross | 559,224,000 | 680,286,000
Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Asset | 294,732,000 | 88,349,000
Derivative Liability, Securities Sold under Agreements to Resell, Securities Loaned, Amount Not Offset Against Collateral | 264,492,000 | 591,937,000
Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Collateral, Right to Reclaim Securities | 253,320,000 | 582,950,000
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 | 11,172,000 | 8,987,000
Firm's Securities Fair Value, Collateral for Bank Loans | 45,400,000 |
Customer securities directly with the Options Clearing Corporation to secure obligations and margin requirements under option contracts written by customers | 284,100,000 |
Customer Securities under Customer Margin Loans that are Available to be Pledged, Re-pledged Amount | 216,900,000 |
Customer Securities Fair Value, Collateral for Bank Loans | 44,500,000 |
customer securities under customer margin loans that are available to be pledged | 1,600,000,000 |
Securities Purchased under Agreements to Resell, Liability | (294,732,000) | (88,349,000)
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 | 559,224,000 |
Equity Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair Value of Securities Received as Collateral under Securities Borrowed Transactions | 108,100,000 | 108,000,000.0
Fair value of Securities Received as Collateral, Sold and Re-Pledged under Securities Loaned | 35,500,000 | 36,200,000
Securities Sold under Agreements to Repurchase, Fair Value of Collateral | $ 328,600,000 | $ 88,300,000
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 |

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