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Securitizations and Variable Interest Entities - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Servicing Assets at Fair Value [Line Items]      
Average period to securitization 30 days    
MSRs retained $ 8,100 $ 7,200  
Percentage of loan transferred through securitization 60 days or more past due 6.70%   7.60%
Other secured borrowings $ 4,295,408   $ 4,012,812
Loans held for investment, at fair value 3,900,000   3,600,000
Loans held for investment, not pledged as collateral 117,200   81,300
HMBS - Related Borrowings [Member]      
Servicing Assets at Fair Value [Line Items]      
Other secured borrowings $ 3,700,000   $ 3,400,000