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Securitization and Variable Interest Entities - Schedule of Assets That Relate to Continuing Involvement with Transferred Financial Assets with Servicing Rights and Maximum Exposure to Loss Including the Unpaid Principal Balance (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Transfers and Servicing [Abstract]    
Mortgage servicing rights, at amortized cost $ 84,397 $ 44,615
Mortgage servicing rights, at fair value 2,965 3,075
Advances and match funded advances 10,153 15,888
Unpaid principal balance of loans transferred 8,816,416 [1] 5,641,277 [1]
Maximum exposure to loss $ 8,913,931 $ 5,704,855
[1] The UPB of the loans transferred is the maximum exposure to loss under our standard representations and warranties obligations.