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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 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Derivative Instruments, Gain (Loss) [Line Items]        
Total $ (439) $ 161 $ (435) $ 76
IRLCs | Other Income
       
Derivative Instruments, Gain (Loss) [Line Items]        
Total $ (439) $ 161 $ (435) $ 76