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Effect of Derivative and Hedging Activity, on Statement of Income (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Derivatives designated as hedges  
Derivative, Gain (Loss) on Derivative, Net $ 4
Derivatives Not Designated As Hedges
 
Derivatives designated as hedges  
Derivative, Gain (Loss) on Derivative, Net 4
IRLCs | Derivatives Not Designated As Hedges | Other Income
 
Derivatives designated as hedges  
Derivative, Gain (Loss) on Derivative, Net $ 4