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Securitizations and Variable Interests Entities - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Servicing Assets at Fair Value [Line Items]      
Average period to securitization 30 days    
HMBS-related borrowings $ 4,601,556 $ 3,433,781  
Loans held for investment, at fair value $ 4,715,831 3,565,716  
Pledge advance remittance period 2 days    
Forward Loans [Member]      
Servicing Assets at Fair Value [Line Items]      
MSRs retained $ 20,700 $ 37,200 $ 36,000
Percentage of transferred residential loans serviced 60 days or more past due 8.90% 7.60%  
Charge-offs, net of recovers, associated with transferred residential loans serviced 60 days or more past due $ 600 $ 300  
HECM [Member]      
Servicing Assets at Fair Value [Line Items]      
Loans held for investment, at fair value 4,700,000 3,600,000  
Loans held for investment, not pledged as collateral $ 83,800 $ 81,300  
Minimum [Member] | Forward Loans [Member]      
Servicing Assets at Fair Value [Line Items]      
Number of days that transferred residential loans serviced were past due 60 days