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Fair Value of Derivative Financial Instruments (Detail) (Derivatives not designated as hedges, USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Derivative, Fair Value, Net      
Derivatives $ 17 $ 144 $ 206
Derivative liabilities 163 16 2
IRLCs | Other Assets
     
Derivative, Fair Value, Net      
Derivatives 17 144 206
IRLCs | Other Liabilities
     
Derivative, Fair Value, Net      
Derivative liabilities $ 163 $ 16 $ 2