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Receivables From And Payables To Brokers, Dealers And Clearing Organizations (Amounts Payable To Brokers, Dealers, And Clearing Organizations) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Due To And From Broker Dealers And Clearing Organizations [Abstract]    
Deposits received from securities loaned $ 429,372 $ 219,782
Securities failed to receive 56,261 29,297
Payable to clearing organizations 18,962 27,223
Payables to broker, dealers and clearing organizations, Total $ 504,595 $ 276,302