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Receivables and Payables - Master Securities Lending Agreements (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Deposits paid for securities borrowed    
Gross Amounts of Recognized Assets $ 42,089 $ 4,246
Net Amounts Presented in the Consolidated Statement of Financial Condition 42,089 4,246
Collateral Received or Pledged (including Cash) 42,089 4,246
Deposits received for securities loaned    
Gross Amounts of Recognized Liabilities (22,610) (4,245)
Net Amounts Presented in the Consolidated Statement of Financial Condition (22,610) (4,245)
Collateral Received or Pledged (including Cash) (22,529) (4,229)
Net Amount $ (81) $ (16)