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Securitizations and Variable Interest Entities - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2016
Mar. 31, 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 7.40%   8.20%
Other secured borrowings $ 3,319,646   $ 3,089,255
Home Equity Conversion Mortgages [Member]      
Servicing Assets at Fair Value [Line Items]      
Loans pledged as collateral 2,800,000   2,500,000
HMBS - Related Borrowings [Member]      
Servicing Assets at Fair Value [Line Items]      
Other secured borrowings 2,600,000   $ 2,400,000
Mortgage Servicing Rights - Amortized Costs [Member]      
Servicing Assets at Fair Value [Line Items]      
MSRs retained $ 7,200 $ 8,500