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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 | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Reverse repurchase agreements |  |
Securities Purchased under Agreements to Resell, Gross | $ 133,550 | $ 24,006
Securities Purchased under Agreements to Resell, Liability | 128,698 | 0
Securities purchased under agreements to resell, $3,617 at fair value | 4,852 | 24,006
Securities Purchased under Agreements to Resell, Collateral, Obligation to Return Securities | (3,617) | (23,972)
Securities Purchased under Agreements to Resell, Collateral, Obligation to Return Cash | 0 | 0
Securities Purchased under Agreements to Resell, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election | 1,235 | 34
Securities borrowed |  |
Securities Borrowed, Gross | 158,454 | 154,090
Securities Borrowed, Liability | 0 | 0
Securities borrowed | 158,454 | 154,090
Securities Borrowed, Collateral, Obligation to Return Securities | (154,775) |
Securities Borrowed, Collateral, Obligation to Return Cash | 0 | 0
Securities Borrowed, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election | 3,679 | 3,580
Gross Amounts of Recognized Assets | 292,004 | 178,096
Gross Amounts Offset in the Balance Sheet | (128,698) | 0
Net Amounts of Assets Presented on the Balance Sheet | 163,306 | 178,096
Financial Instruments | (158,392) | (174,482)
Derivative Asset, Securities Purchased under Agreements to Resell, Securities Borrowed, Collateral, Obligation to Return Cash | 0 | 0
Net Amount | 4,914 | 3,614
Repurchase agreements |  |
U.S. Treasury and agency securities |  | 378,084
Securities Sold under Agreements to Repurchase, Asset | 128,698 | 0
Net Amounts of Liabilities Presented on the Balance Sheet | 457,809 | 378,084
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities | (453,168) | (376,273)
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 | 4,641 | 1,811
Securities loaned: |  |
Securities Loaned, Gross |  | 179,875
Securities Loaned, Asset | 0 | 0
Securities loaned | 141,654 | 179,875
Securities Loaned, Collateral, Right to Reclaim Securities | (134,419) | (171,991)
Securities Loaned, Collateral, Right to Reclaim Cash | 0 | 0
Securities Loaned, Offset Against Collateral, Net of Not Subject to Master Netting Arrangement, Policy Election | 7,235 | 7,884
Gross amount of recognized liabilities for repurchase agreements and securities loaned | 728,161 | 557,959
Gross Amounts Offset in the Balance Sheet | (128,698) | 0
Net Amounts of Liabilities Presented on the Balance Sheet | 599,463 | 557,959
Financial Instruments | (587,587) | (548,264)
Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Collateral, Right to Reclaim Cash | 0 | 0
Net Amount | 11,876 | 9,695
Securities Borrowed [Member] |  |
Securities borrowed |  |
Securities Borrowed, Collateral, Obligation to Return Securities |  | $ (150,510)
Maturity Overnight and Open [Member] | US Treasury and Government [Member] |  |
Repurchase agreements |  |
U.S. Treasury and agency securities | 586,507 |
Maturity Overnight and Open [Member] | Equity Securities [Member] |  |
Securities loaned: |  |
Securities Loaned, Gross | $ 141,654 |

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