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Derivative Financial Instruments and Hedging Activities - Schedule of Changes in Notional Balance of Holdings of Derivatives (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Fair value of derivative assets (liabilities) at:    
Derivatives, at fair value $ 14,776 $ 6,367
Interest Rate Lock Commitments [Member]    
Derivative Notional Balance    
Beginning notional balance 278,317  
Additions 3,436,643  
Amortization 0  
Maturities (2,382,902)  
Terminations (691,729)  
Ending notional balance 640,329  
Fair value of derivative assets (liabilities) at:    
Derivatives, at fair value $ 14,576 6,080
Maturity July 2016 - Oct. 2016  
Forward MBS Trades [Member]    
Derivative Notional Balance    
Beginning notional balance $ 632,720  
Additions 2,777,175  
Amortization 0  
Maturities (1,130,707)  
Terminations (1,396,824)  
Ending notional balance 882,364  
Fair value of derivative assets (liabilities) at:    
Derivatives, at fair value $ (7,365) 295
Maturity Sept. 2016  
Interest Rate Caps [Member]    
Derivative Notional Balance    
Beginning notional balance $ 2,110,000  
Additions 195,000  
Amortization (600,000)  
Maturities 0  
Terminations (275,000)  
Ending notional balance 1,430,000  
Fair value of derivative assets (liabilities) at:    
Derivatives, at fair value $ 200 $ 2,042
Maturity Nov. 2016 - May 2018