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Securitization and Variable Interest Entities - Narrative (Details) (USD $)
 3 Months Ended 12 Months Ended 3 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2014
Advance Receivable Backed Notes Series F [Member]
Dec. 31, 2013
Advance Receivable Backed Notes Series F [Member]
Mar. 31, 2014
Lending [Member]
HECM [Member]
Mar. 31, 2014
HMBS - Related Borrowings [Member]
Dec. 31, 2013
HMBS - Related Borrowings [Member]
Mar. 31, 2014
Mortgage Servicing Rights - Amortized Costs [Member]
Mar. 31, 2013
Mortgage Servicing Rights - Amortized Costs [Member]
Servicing Assets at Fair Value [Line Items]                  
Acquisitions               $ 11,614,000 $ 28,705,000
Percentage Of Loan Transferred Through Securitization 60 Days Or More Past Due 2.90% 2.60%              
Secured Borrowings With Pledge Of Collateral           870,500,000 615,600,000    
Loans held for investment - reverse mortgages, at fair value 923,464,000 618,018,000              
Loans Pledged as Collateral         618,000,000        
Match Funded Liabilities     $ 31,370,000 $ 33,211,000