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Derivative Financial Instruments and Hedging Activities - Schedule of Changes in Notional Balance of Holdings of Derivatives (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Fair value of derivative assets (liabilities) at:    
Derivatives, at fair value $ 14,115 $ 6,367
Interest Rate Lock Commitments [Member]    
Derivative Notional Balance [Roll Forward]    
Beginning notional balance 278,317  
Additions 1,460,093  
Amortization 0  
Maturities (1,017,006)  
Terminations (241,099)  
Ending notional balance 480,305  
Fair value of derivative assets (liabilities) at:    
Derivatives, at fair value $ 13,545 6,080
Maturity Apr. 2016 - Jun. 2016  
Forward MBS Trades [Member]    
Derivative Notional Balance [Roll Forward]    
Beginning notional balance $ 632,720  
Additions 1,100,531  
Amortization 0  
Maturities (392,398)  
Terminations (514,460)  
Ending notional balance 826,393  
Fair value of derivative assets (liabilities) at:    
Derivatives, at fair value $ (5,291) 295
Maturity June 2016  
Interest Rate Caps [Member]    
Derivative Notional Balance [Roll Forward]    
Beginning notional balance $ 2,110,000  
Additions 25,000  
Amortization (400,000)  
Maturities 0  
Terminations (50,000)  
Ending notional balance 1,685,000  
Fair value of derivative assets (liabilities) at:    
Derivatives, at fair value $ 570 $ 2,042
Maturity Nov. 2016 - Dec. 2017