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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, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Receivables From And Payables To Brokers, Dealers And Clearing Organizations [Abstract]    
Deposits received for securities loaned $ 151,313 $ 124,711
Payable to clearing organizations 9,249 3,984
Securities failed to receive 8,526 11,216
Payables to broker, dealers and clearing organizations, Total $ 169,088 $ 139,911