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Borrowings - Carrying Value of Assets Backed Securities Issued (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Debt Instrument [Line Items]    
Carrying value $ 1,643,741   
ABS Outstanding
   
Debt Instrument [Line Items]    
Principal balance 1,633,688  
Unamortized premium 9,906  
Unamortized discount (10,990)  
Loan loss reserve     
Carrying value 1,643,741  
Number of series 5  
ABS Outstanding | Minimum
   
Debt Instrument [Line Items]    
Weighted average interest rates 2.80%  
ABS Outstanding | Maximum
   
Debt Instrument [Line Items]    
Weighted average interest rates 3.50%  
ABS Outstanding | Interest-only securities
   
Debt Instrument [Line Items]    
Principal balance 11,137  
Residential loans Held as Collateral
   
Debt Instrument [Line Items]    
Principal balance 1,783,983  
Unamortized premium 27,163  
Unamortized discount     
Loan loss reserve (884)  
Carrying value 1,810,262  
Residential loans Held as Collateral | Interest-only securities
   
Debt Instrument [Line Items]    
Principal balance