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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, 2016
Dec. 31, 2015
Fair value of derivative assets (liabilities) at:    
Derivatives, at fair value $ 11,620 $ 6,367
Interest Rate Lock Commitments [Member]    
Derivative Notional Balance    
Beginning notional balance 278,317  
Additions 5,200,747  
Amortization 0  
Maturities (3,879,488)  
Terminations (1,109,562)  
Ending notional balance $ 490,014  
Maturity Oct. 2016 - Jan. 2017  
Fair value of derivative assets (liabilities) at:    
Derivatives, at fair value $ 10,827 6,080
Forward MBS Trades [Member]    
Derivative Notional Balance    
Beginning notional balance 632,720  
Additions 4,210,788  
Amortization 0  
Maturities (1,994,649)  
Terminations (2,122,842)  
Ending notional balance $ 726,017  
Maturity Dec. 2016  
Fair value of derivative assets (liabilities) at:    
Derivatives, at fair value $ (2,525) 295
Interest Rate Caps [Member]    
Derivative Notional Balance    
Beginning notional balance 2,110,000  
Additions 625,000  
Amortization (700,000)  
Maturities 0  
Terminations (975,000)  
Ending notional balance $ 1,060,000  
Maturity Nov. 2016 - July 2018  
Fair value of derivative assets (liabilities) at:    
Derivatives, at fair value $ 793 $ 2,042