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Securitizations and Variable Interest Entities - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Transfers and Servicing [Abstract]          
Average period to securitization     30 days    
MSRs retained $ 6,900 $ 9,500 $ 15,000 $ 16,700  
Percentage of loan transferred through securitization 60 days or more past due     6.80%   7.60%
HMBS-related borrowings 4,061,626   $ 4,061,626   $ 3,433,781
Loans held for investment, at fair value 4,200,000   4,200,000   3,600,000
Loans held for investment, not pledged as collateral $ 99,100   $ 99,100   $ 81,300