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Derivative Financial Instruments and Hedging Activities - Schedule of Changes in Notional Balance of Holdings of Derivatives (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Fair value of derivative assets (liabilities) at:    
Derivatives, at fair value $ 6,169 [1] $ 15,494 [1]
Interest Rate Lock Commitments [Member]
    
Derivative Notional Balance [Roll Forward]    
Beginning notional balance 751,436  
Additions 3,795,311  
Amortization 94,571  
Maturities (3,298,265)  
Terminations (876,254)  
Ending notional balance 466,799  
Fair value of derivative assets (liabilities) at:    
Derivatives, at fair value 6,117 8,433
Maturity Nov. 2014 - Jan. 2014  
Forward Mortgage Backed Securities Trades [Member]
    
Derivative Notional Balance [Roll Forward]    
Beginning notional balance 950,648  
Additions 6,951,828  
Amortization 0  
Maturities (3,379,589)  
Terminations (3,762,592)  
Ending notional balance 760,295  
Fair value of derivative assets (liabilities) at:    
Derivatives, at fair value (1,089) 6,905
Maturity Nov. 2014 - Dec. 2014  
Interest Rate Cap [Member]
    
Derivative Notional Balance [Roll Forward]    
Beginning notional balance 1,868,000  
Additions 100,000  
Amortization (490,000)  
Maturities 0  
Terminations 0  
Ending notional balance 1,478,000  
Fair value of derivative assets (liabilities) at:    
Derivatives, at fair value $ 91 $ 442
Maturity Nov. 2016  
[1] See Note 15 – Derivative Financial Instruments and Hedging Activities for additional information.