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Derivative Financial Instruments and Hedging Activities - Schedule of Changes in Notional Balance of Holdings of Derivatives (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Fair value of derivative assets (liabilities) at:    
Derivatives, at fair value $ 10,010 $ 6,065
Interest Rate Lock Commitments [Member]    
Derivative Notional Balance [Roll Forward]    
Beginning notional balance 239,406  
Additions 4,210,647  
Amortization 0  
Maturities (3,727,042)  
Terminations (337,938)  
Ending notional balance 385,073  
Fair value of derivative assets (liabilities) at:    
Derivatives, at fair value $ 10,010 6,065
Maturity Oct. 2015 - Dec. 2015  
Forward MBS Trades [Member]    
Derivative Notional Balance [Roll Forward]    
Beginning notional balance [1] $ 703,725  
Additions [1] 6,248,108  
Amortization [1] 0  
Maturities [1] (3,414,877)  
Terminations [1] (2,864,057)  
Ending notional balance [1] 672,899  
Fair value of derivative assets (liabilities) at:    
Derivatives, at fair value [1] $ (3,438) (2,854)
Maturity [1] Nov. 2015 - Dec. 2015  
Interest Rate Caps [Member]    
Derivative Notional Balance [Roll Forward]    
Beginning notional balance $ 1,729,000  
Additions 2,179,333  
Amortization (439,333)  
Maturities 0  
Terminations 0  
Ending notional balance 3,469,000  
Fair value of derivative assets (liabilities) at:    
Derivatives, at fair value $ 1,501 567
Maturity Nov. 2016 - Oct. 2017  
Interest Rate Swaps [Member]    
Derivative Notional Balance [Roll Forward]    
Beginning notional balance $ 0  
Additions 450,000  
Amortization 0  
Maturities 0  
Terminations (450,000)  
Ending notional balance 0  
Fair value of derivative assets (liabilities) at:    
Derivatives, at fair value $ 0 $ 0
[1] 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 commitments and originations and expected time to sell.