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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, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Servicing Assets at Fair Value [Line Items]          
Average period to securitization     30 days    
Percentage of loan transferred through securitization 60 days or more past due     7.30%   8.20%
Other secured borrowings $ 3,828,019   $ 3,828,019   $ 3,089,255
Loans held for investment - Reverse mortgages, at fair value 3,300,000   3,300,000    
Loans held for investment - Reverse mortgages, not pledged as collateral 73,600   73,600    
Mortgage Servicing Rights - Amortized Costs [Member]          
Servicing Assets at Fair Value [Line Items]          
MSRs retained 9,800 $ 9,500 26,500 $ 27,800  
HMBS - Related Borrowings [Member]          
Servicing Assets at Fair Value [Line Items]          
Other secured borrowings 3,200,000   3,200,000    
Home Equity Conversion Mortgages [Member]          
Servicing Assets at Fair Value [Line Items]          
Loans pledged as collateral $ 3,300,000   $ 3,300,000