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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, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 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 $ 3,568,017   $ 3,568,017   $ 3,089,255
Loans held for investment - Reverse mortgages, at fair value 3,100,000   3,100,000    
Loans held for investment - Reverse mortgages, not pledged as collateral 86,200   86,200    
Mortgage Servicing Rights - Amortized Costs [Member]          
Servicing Assets at Fair Value [Line Items]          
MSRs retained 9,500 $ 9,800 16,700 $ 18,300  
HMBS - Related Borrowings [Member]          
Servicing Assets at Fair Value [Line Items]          
Other secured borrowings 2,900,000   2,900,000    
Home Equity Conversion Mortgages [Member]          
Servicing Assets at Fair Value [Line Items]          
Loans pledged as collateral $ 3,000,000   $ 3,000,000