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Sales of Advances and MSRs - Summary of MSRs and Advances Sold (Footnote) (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
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Agency And Non-Agency Mortgage Servicing Rights [Member] |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |
UPB of rights to MSRs sold | $ 3,700.0 |  |
Agency MSRs [Member] |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |
UPB of rights to MSRs sold |  | $ 87,600.0 |
Mortgage Servicing Rights [Member] |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |
UPB of MSRs related to Freddie Mac mortgages |  |  | $ 11,800.0
OASIS Series 2014-1 [Member] | Secured Debt [Member] |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |
Face amount |  |  | $ 123.6

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