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Derivative Financial Instruments - Schedule of Notional or Contractual Amounts and Fair Values of Derivative Instruments (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Derivative [Line Items]    
Notional Amount      
Derivative Assets, Fair Value 115,920 949
Derivative Liabilities, Fair Value 77,882 1,102
Collateral receivable on derivative instruments 54,666   
Collateral payable on derivative instruments 838   
Interest Rate Lock Commitments [Member]
   
Derivative [Line Items]    
Notional Amount 3,085,680 35,266
Derivative Assets, Fair Value 96,144 949
Derivative Liabilities, Fair Value      
Forward Sales Commitments [Member]
   
Derivative [Line Items]    
Notional Amount 5,069,979 42,078
Derivative Assets, Fair Value 217   
Derivative Liabilities, Fair Value 77,880 1,102
MBS Purchase Commitment [Member]
   
Derivative [Line Items]    
Notional Amount 1,576,101   
Derivative Assets, Fair Value 19,559   
Derivative Liabilities, Fair Value $ 2