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Receivables and Payables - Master Securities Lending Agreements (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Deposits paid for securities borrowed    
Gross Amounts of Recognized Assets $ 18,458 $ 374
Net Amounts Presented in the Consolidated Statement of Financial Condition 18,458 374
Collateral Received or Pledged (including Cash) 18,458 374
Deposits received for securities loaned    
Gross Amounts of Recognized Liabilities (21,027) (35,198)
Net Amounts Presented in the Consolidated Statement of Financial Condition (21,027) (35,198)
Collateral Received or Pledged (including Cash) (20,862) (34,245)
Net Amount $ (165) $ (953)