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Receivables From And Payables To Brokers, Dealers And Clearing Organizations (Amounts Receivable From Brokers, Dealers, And Clearing Organizations) (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Due To And From Broker Dealers And Clearing Organizations [Abstract]    
Receivables from clearing organizations $ 361,708 $ 471,122
Deposits paid for securities borrowed 177,470 135,373
Securities failed to deliver 44,280 21,295
Receivables from brokers, dealers and clearing organizations, Total $ 583,458 $ 627,790