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Securitizations and Variable Interests Entities - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Servicing Assets at Fair Value [Line Items]        
Average period to securitization 30 days      
Pledge advance remittance period 2 days      
Mortgage servicing rights, at fair value $ 1,457,149 $ 671,962 $ 679,256 $ 761,190
Advances 249,382 211,793    
Forward Loans [Member]        
Servicing Assets at Fair Value [Line Items]        
MSRs retained $ 8,300 $ 20,700 $ 37,200  
Percentage of transferred residential loans serviced 60 days or more past due 8.30% 8.90%    
HECM [Member]        
Servicing Assets at Fair Value [Line Items]        
Loans held for investment, not pledged as collateral $ 68,400 $ 83,800    
Residential Mortgage Backed Securitization Trusts [Member]        
Servicing Assets at Fair Value [Line Items]        
Mortgage servicing rights, at fair value 200      
Investment in the residual securities 1,700      
Advances $ 1,200      
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