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Summary of Business, Market Conditions, and Financial Statement Presentation (Details)
1 Months Ended 3 Months Ended
Sep. 30, 2012
Sep. 30, 2012
Jun. 30, 2012
Summary of Business, Market Conditions, and Financial Statement Presentation      
Growth rate of US economy (as a percent)   2.00% 1.30%
Unemployment rates (as a percent) 7.80%