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Effect of Derivative and Hedging Activity, on Statement of Income (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2013
Derivatives designated as hedges    
Derivative, Gain (Loss) on Derivative, Net $ 307 $ (128)
Derivatives Not Designated As Hedges
    
Derivatives designated as hedges    
Derivative, Gain (Loss) on Derivative, Net 307 (128)
IRLCs | Derivatives Not Designated As Hedges | Other Income
    
Derivatives designated as hedges    
Derivative, Gain (Loss) on Derivative, Net $ 307 $ (128)