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v3.19.1

Collateralized Transactions - Additional Information (Narrative) (Details) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 USD ($) dealer | Dec. 31, 2018 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Gross Amounts of Recognized Liabilities | $ 369,109,000 | $ 566,357,000
Gross Amounts of Recognized Liabilities | 232,370,000 | 146,815,000
Bank call loans | 0 | 15,000,000
Customer Securities for which Entity has Right to Sell or Repledge, Fair Value | 1,200,000,000 |
Customer securities under customer margin loans agreement available to be repledged | 186,000,000 |
Outstanding letters of credit | 0 |
Amounts pledged | 390,832,000 | 517,951,000
Carrying value of securities owned by the Company loaned or pledged | $ 0 | 20,200,000
Number of broker-dealers | dealer | 6 |
Receivable from brokers and clearing organizations | $ 93,100,000 |
Securities Sold under Agreements to Repurchase, Asset | 100,488,000 | 82,139,000
Securities Sold under Agreements to Repurchase, Amount Not Offset Against Collateral | 268,621,000 | 484,218,000
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities | 268,156,000 | 480,322,000
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 | 465,000 | 3,896,000
Securities Loaned, Asset | 0 | 0
Securities Loaned, Amount Not Offset Against Collateral | 232,370,000 | 146,815,000
Securities Loaned, Collateral, Right to Reclaim Securities | 225,992,000 | 139,232,000
Securities Loaned, Collateral, Right to Reclaim Cash | 0 | 0
Securities Loaned, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election | 6,378,000 | 7,583,000
Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Gross | 601,479,000 | 713,172,000
Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Asset | 100,488,000 | 82,139,000
Derivative Liability, Securities Sold under Agreements to Resell, Securities Loaned, Amount Not Offset Against Collateral | 500,991,000 | 631,033,000
Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Collateral, Right to Reclaim Securities | 494,148,000 | 619,554,000
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 | 6,843,000 | 11,479,000
Reverse Repurchase Agreements |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Securities received as collateral under securities borrowed transaction with market value | 100,900,000 | 83,000,000
Securities Loaned [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Customer securities under customer margin loans agreement available to be repledged | 36,600,000 | 27,600,000
Repurchase Agreements [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Customer securities under customer margin loans agreement available to be repledged | 100,900,000 | 83,000,000
Securities Borrowed Transactions |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Securities received as collateral under securities borrowed transaction with market value | 107,300,000 | $ 104,900,000
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 | 601,479,000 |
Short-term Debt [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Collateralized loans, collateralized by firm | 18,600,000 |
Collateralized loans, collateralized by customer securities | $ 1,600,000 |
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 | $ 219,400,000 |

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