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Advances - Narrative (Details) (Servicing, Foreclosures and Bankruptcy Costs [Member], USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Servicing, Foreclosures and Bankruptcy Costs [Member]
   
Advances On Behalf of Borrowers [Line Items]    
Allowance for losses on advances $ 48.4 $ 38.4