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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