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Securitizations and Variable Interest Entities - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Transfers and Servicing [Abstract]          
Average period to securitization     30 days    
MSRs retained $ 3,600 $ 9,800 $ 18,600 $ 26,500  
Percentage of loan transferred through securitization 60 days or more past due     7.70%   7.60%
HMBS-related borrowings [1] 4,358,277   $ 4,358,277   $ 3,433,781
Loans held for investment, at fair value 4,500,000   4,500,000   3,600,000
Loans held for investment, not pledged as collateral $ 39,200   $ 39,200   $ 81,300
[1] Represents amounts due to the holders of beneficial interests in Ginnie Mae guaranteed HMBS. The beneficial interests have no maturity dates, and the borrowings mature as the related loans are repaid.