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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
 6 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Fair value of derivative assets (liabilities) at:    
Derivative, Fair Value, Net $ 10,336 [1] $ 15,494 [1]
Interest Rate Lock Commitments [Member]
    
Derivative Notional Balance [Roll Forward]    
Notional Amount, beginning balance 751,436  
Derivative Additions 2,511,371  
Amortization Of Derivative 94,571  
Derivative Maturities (2,233,309)  
Derivative Terminations (714,928)  
Notional Amount, ending balance 409,141  
Fair value of derivative assets (liabilities) at:    
Derivative, Fair Value, Net 10,307 8,433
Derivative Maturity Period July 2014 - Oct. 2014  
Forward Mortgage Backed Securities Trades [Member]
    
Derivative Notional Balance [Roll Forward]    
Notional Amount, beginning balance 950,648  
Derivative Additions 4,225,373  
Amortization Of Derivative 0  
Derivative Maturities (1,887,517)  
Derivative Terminations (2,389,060)  
Notional Amount, ending balance 899,444  
Fair value of derivative assets (liabilities) at:    
Derivative, Fair Value, Net (5,710) 6,905
Derivative Maturity Period July 2014 - Sept. 2014  
Interest Rate Cap [Member]
    
Derivative Notional Balance [Roll Forward]    
Notional Amount, beginning balance 1,868,000  
Derivative Additions 100,000  
Amortization Of Derivative (221,000)  
Derivative Maturities 0  
Derivative Terminations 0  
Notional Amount, ending balance 1,747,000  
Fair value of derivative assets (liabilities) at:    
Derivative, Fair Value, Net $ 97 $ 442
Derivative Maturity Period Nov. 2016  
[1] See Note 14 – Derivative Financial Instruments and Hedging Activities for additional information regarding derivatives.