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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
Mar. 31, 2018
Dec. 31, 2017
Reverse repurchase agreements    
Gross Amounts of Recognized Assets $ 98,984 $ 200,712
Gross Amounts Offset on the Balance Sheet (98,984) (200,054)
Net Amounts of Assets Presented on the Balance Sheet 0 658
Financial Instruments 0 0
Cash Collateral Received 0 0
Net Amount 0 658
Securities borrowed    
Gross Amounts of Recognized Assets 112,272 132,368
Gross Amounts Offset on the Balance Sheet 0 0
Net Amounts of Assets Presented on the Balance Sheet 112,272 132,368
Financial Instruments (110,197) (128,575)
Cash Collateral Received 0 0
Net Amount 2,075 3,793
Total    
Gross Amounts of Recognized Assets 211,256 333,080
Gross Amounts Offset on the Balance Sheet (98,984) (200,054)
Net Amounts of Assets Presented on the Balance Sheet 112,272 133,026
Financial Instruments (110,197) (128,575)
Cash Collateral Received 0 0
Net Amount 2,075 4,451
Repurchase agreements    
Gross Amounts of Recognized Liabilities 675,001 786,532
Gross Amounts Offset on the Balance Sheet (98,984) (200,054)
Net Amounts of Liabilities Presented on the Balance Sheet 576,017 586,478
Financial Instruments (573,624) (585,289)
Cash Collateral Pledged 0 0
Net Amount 2,393 1,189
Securities loaned    
Gross Amounts of Recognized Liabilities 174,567 180,270
Gross Amounts Offset on the Balance Sheet 0 0
Net Amounts of Liabilities Presented on the Balance Sheet 174,567 180,270
Financial Instruments (167,705) (170,176)
Cash Collateral Pledged 0 0
Net Amount 6,862 10,094
Total    
Gross Amounts of Recognized Liabilities 849,568 966,802
Gross Amounts Offset on the Balance Sheet (98,984) (200,054)
Net Amounts of Liabilities Presented on the Balance Sheet 750,584 766,748
Financial Instruments (741,329) (755,465)
Cash Collateral Pledged 0 0
Net Amount $ 9,255 $ 11,283