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Securitizations and Variable Interests Entities - Schedule of Carrying Amounts of Assets that Relate to Continuing Involvement with Transferred Forward Loans (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Dec. 31, 2013
Transfers and Servicing [Abstract]      
Mortgage servicing rights, at amortized cost $ 45,064 $ 82,542 $ 44,615
Mortgage servicing rights, at fair value 226 2,840 3,075
Advances and match funded advances 21,686 1,236 15,888
Unpaid principal balance of loans transferred 6,811,864 [1] 9,353,187 [1],[2] 5,641,277 [2]
Maximum exposure to loss $ 6,878,840 $ 9,439,805 $ 5,704,855
[1] The UPB of the loans transferred is the maximum exposure to loss under our standard representations and warranties obligations.
[2] The UPB of the loans transferred is the maximum exposure to loss under our standard representations and warranties obligations.