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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, 2011
Sep. 30, 2011
Dec. 31, 2010
Deposits received from securities loaned $ 124,711   $ 27,907
Securities failed to receive 11,216   78,499
Payable to clearing organizations 3,984   8,463
Payables to broker, dealers and clearing organizations, Total 139,911   114,869
Trading securities pledged $ 392,395 $ 392,400