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Gains Recognized in Income on Derivatives (Detail) (Derivatives not designated as hedges, USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Derivative Instruments, Gain (Loss) Recognized in Income, Net  
Total $ 160
IRLCs | Other Income
 
Derivative Instruments, Gain (Loss) Recognized in Income, Net  
Total $ 160