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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
Dec. 31, 2012
Dec. 31, 2011
Receivables From And Payables To Brokers, Dealers And Clearing Organizations [Abstract]    
Deposits received for securities loaned $ 19,218 $ 124,711
Payable to clearing organizations 9,246 3,984
Securities failed to receive 4,747 11,216
Payables to broker, dealers and clearing organizations, Total $ 33,211 $ 139,911