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Derivative Financial Instruments and Hedging Activities - Summary of Open Derivative Positions and the Gains (Losses) on all Derivatives (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Not Designated as Hedging Instrument [Member]    
Hedge the effect of changes in interest rates on interest expense on borrowings    
Asset / (Liability) at Fair Value [1] $ 8,417  
Gains (Losses) (10,038)  
Interest Rate Cap [Member]    
Hedge the effect of changes in interest rates on interest expense on borrowings    
Notional Amount $ 2,110,000 $ 1,729,000
Interest Rate Cap [Member] | Other Net [Member] | Not Designated as Hedging Instrument [Member]    
Hedge the effect of changes in interest rates on interest expense on borrowings    
Expiration Date [2] Nov. 2016 - Dec. 2017  
Notional Amount [2] $ 2,110,000  
Asset / (Liability) at Fair Value [1],[2] 2,042  
Gains (Losses) [2] $ (1,377)  
Consolidated Statement of Operations Caption [2] Other, net  
Forward Mortgage Backed Securities Trades [Member]    
Hedge the effect of changes in interest rates on interest expense on borrowings    
Notional Amount [3] $ 632,720 703,725
Forward Mortgage Backed Securities Trades [Member] | Gain On Loans Held For Sale Net [Member] | Not Designated as Hedging Instrument [Member]    
Hedge the effect of changes in interest rates on interest expense on borrowings    
Expiration Date Feb. 2016 - Mar 2016  
Notional Amount $ 632,720  
Asset / (Liability) at Fair Value [1] 295  
Gains (Losses) $ (8,675)  
Consolidated Statement of Operations Caption Gain on loans held for sale, net  
IRLCs [Member]    
Hedge the effect of changes in interest rates on interest expense on borrowings    
Notional Amount $ 278,317 $ 239,406
IRLCs [Member] | Gain On Loans Held For Sale Net [Member] | Not Designated as Hedging Instrument [Member]    
Hedge the effect of changes in interest rates on interest expense on borrowings    
Expiration Date Dec. 2015 - Mar. 2016  
Notional Amount $ 278,317  
Asset / (Liability) at Fair Value [1] 6,080  
Gains (Losses) $ 14  
Consolidated Statement of Operations Caption Gain on loans held for sale, net  
[1] Derivatives are reported at fair value in Receivables, Other assets or in Other liabilities on our Consolidated Balance Sheets.
[2] To hedge the effect of increases in the interest on our variable rate debt as a result of increases in the index, such as 1ML, that is used in determining the interest rate on our variable rate advance funding facilities.
[3] As loans are originated and sold or as loan commitments expire, our forward MBS trade positions mature and are replaced by new positions based upon new loan originations and commitments and expected time to sell.