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Gains Recognized in Income on Derivatives (Detail) (Derivatives not designated as hedges, USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Derivative Instruments, Gain (Loss) [Line Items]        
Total $ 307 $ 94 $ (128) $ 170
IRLCs | Other Income
       
Derivative Instruments, Gain (Loss) [Line Items]        
Total $ 307 $ 94 $ (128) $ 170