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Receivables and Payables - Master Securities Lending Agreements (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Deposits paid for securities borrowed    
Gross Amounts of Recognized Assets $ 12,933 $ 374
Net Amounts Presented in the Consolidated Statement of Financial Condition 12,933 374
Collateral Received or Pledged (including Cash) 12,933 374
Deposits received for securities loaned    
Gross Amounts of Recognized Liabilities (61,847) (35,198)
Net Amounts Presented in the Consolidated Statement of Financial Condition (61,847) (35,198)
Collateral Received or Pledged (including Cash) (61,369) (34,245)
Net Amount $ (478) $ (953)