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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
 3 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Fair value of derivative assets (liabilities) at:    
Derivative, Fair Value, Net $ 10,409 [1] $ 15,494 [1]
Interest Rate Lock Commitments [Member]
    
Derivative Notional Balance [Roll Forward]    
Notional Amount, beginning balance 751,436  
Derivative Additions 1,220,165  
Amortization Of Derivative 94,571  
Derivative Maturities (1,134,684)  
Derivative Terminations (310,295)  
Notional Amount, ending balance 621,193  
Fair value of derivative assets (liabilities) at:    
Derivative, Fair Value, Net 9,420 8,433
Derivative Maturity Period April 2014 - July 2014  
Forward Mortgage Backed Securities Trades [Member]
    
Derivative Notional Balance [Roll Forward]    
Notional Amount, beginning balance 950,648  
Derivative Additions 749,786  
Amortization Of Derivative 0  
Derivative Maturities (438,509)  
Derivative Terminations (333,877)  
Notional Amount, ending balance 928,048  
Fair value of derivative assets (liabilities) at:    
Derivative, Fair Value, Net 699 6,905
Derivative Maturity Period April 2014 - June 2014  
Interest Rate Cap [Member]
    
Derivative Notional Balance [Roll Forward]    
Notional Amount, beginning balance 1,868,000  
Derivative Additions 100,000  
Amortization Of Derivative (112,000)  
Derivative Maturities 0  
Derivative Terminations 0  
Notional Amount, ending balance 1,856,000  
Fair value of derivative assets (liabilities) at:    
Derivative, Fair Value, Net $ 324 $ 442
Derivative Maturity Period Nov. 2016  
[1] See Note 15 — Derivative Financial Instruments and Hedging Activities for additional information regarding derivatives.