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Business Combinations (Details) (Harrisonburg branch acquisition [Member], USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Harrisonburg branch acquisition [Member]
    
Outstanding principal balance and carrying amount of acquired loans    
Outstanding principal balance $ 50,869 $ 54,953
Carrying amount $ 50,221 $ 53,359