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Cash and Securities Segregated for Regulatory and Other Purposes (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Cash and Securities Segregated for Regulatory and Other Purposes    
Cash segregated in special reserve bank account for exclusive benefit of customer $ 1.0 $ 1.0
ClearPoint
   
Cash and Securities Segregated for Regulatory and Other Purposes    
Cash received in connection with a working capital loan agreement included in segregated cash   12.0
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Cash and Securities Segregated for Regulatory and Other Purposes    
Cash on deposit in connection with ClearPoint's loan origination activities included in segregated cash $ 5.0