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Commitments - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 9 Months Ended
Dec. 21, 2012
Sep. 30, 2015
Altisource Residential Lp [Member]    
Other Commitments [Line Items]    
Term of agreement 15 years  
Altisource [Member]    
Other Commitments [Line Items]    
Automatic renewal term of support services agreement   1 year
Floating Rate Reverse Mortgage Loans [Member]    
Other Commitments [Line Items]    
Additional borrowing capacity to borrowers   $ 861.2
Forward Mortgage Loan Interest Rate Lock Commitments [Member]    
Other Commitments [Line Items]    
Short-term commitments to lend   373.0
Reverse Mortgage Loan Interest Rate Lock Commitments [Member]    
Other Commitments [Line Items]    
Short-term commitments to lend   $ 12.1