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Business Combinations (Tables)
6 Months Ended
Jun. 30, 2012
Harrisonburg branch acquisition [Member]
 
Business Acquisition [Line Items]  
Outstanding principal balance and the carrying amount of acquired loans
         

June 30, 2012:

       

Outstanding principal balance

  $ 50,869  

Carrying amount

  $ 50,221  
   

December 31, 2011:

       

Outstanding principal balance

  $ 54,953  

Carrying amount

  $ 53,359  
First Market Bank Acquisition [Member]
 
Business Acquisition [Line Items]  
Outstanding principal balance and the carrying amount of acquired loans
         

June 30, 2012:

       

Outstanding principal balance

  $ 498,927  

Carrying amount

  $ 489,002  
   

December 31, 2011:

       

Outstanding principal balance

  $ 632,602  

Carrying amount

  $ 620,048