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Securitization and Variable Interests - Narrative (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Servicing Assets at Fair Value [Line Items]      
Percentage Of Loan Transferred Through Securitization 60 Days Or More Past Due 2.60%    
Loans held for investment - reverse mortgages, at fair value $ 618,018 $ 0  
Lending [Member] | HECM [Member]
     
Servicing Assets at Fair Value [Line Items]      
Loans Pledged as Collateral 618,000    
HMBS - Related Borrowings [Member]
     
Servicing Assets at Fair Value [Line Items]      
Secured Borrowings With Pledge Of Collateral 615,576    
Mortgage Servicing Rights - Amortized Costs [Member]
     
Servicing Assets at Fair Value [Line Items]      
Acquisitions $ 74,784 $ 0 $ 0