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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
Mar. 31, 2013
Mar. 31, 2012
Derivative Instruments, Gain (Loss) Recognized in Income, Net    
Total $ 4 $ (85)
IRLCs | Other Income
   
Derivative Instruments, Gain (Loss) Recognized in Income, Net    
Total $ 4 $ (85)