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Collateralized Transactions - Additional Information (Narrative) (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) dealer | Dec. 31, 2019 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Bank call loans |  | $ 82,000,000 | $ 0
Outstanding letters of credit |  | 0 |
Gross Amounts of Recognized Liabilities |  |  | 343,192,000
Gross Amounts of Recognized Liabilities | [1] |  | 234,343,000
Amounts pledged |  | $ 440,531,000 | 357,120,000
Number of broker-dealers | dealer |  | 3 |
Receivable from brokers and clearing organizations |  | $ 69,700,000 |
Firm's Securities Fair Value, Collateral for Bank Loans |  | 63,700,000 |
Customer Securities Fair Value, Collateral for Bank Loans |  | 28,400,000 |
customer securities under customer margin loans that are available to be pledged |  | 1,600,000,000 |
Customer Securities under Customer Margin Loans that are Available to be Pledged, Re-pledged Amount |  | 208,000,000.0 |
Customer securities directly with the Options Clearing Corporation to secure obligations and margin requirements under option contracts written by customers |  | 377,900,000 |
Fair Value of Securities Received as Collateral under Securities Borrowed Transactions |  | 108,000,000.0 |
Reverse Repurchase Agreements |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Securities received as collateral under securities borrowed transaction with market value |  |  | 55,800,000
Securities Borrowed Transactions |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Customer securities under customer margin loans agreement available to be repledged |  |  | 19,300,000
Securities received as collateral under securities borrowed transaction with market value |  |  | 96,300,000
Repurchase Agreements [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Customer securities under customer margin loans agreement available to be repledged |  |  | $ 55,800,000
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 |  | 680,286,000 |
U.S. treasury, agency and sovereign obligations | Maturity Overnight and on Demand [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Gross Amounts of Recognized Liabilities |  | 430,787,000 |
Equity Securities [Member] | Maturity Overnight and on Demand [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Gross Amounts of Recognized Liabilities |  | $ 249,499,000 |
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 |
[1] | (2) Included in payable to brokers, dealers and clearing organizations on the consolidated balance sheet.

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