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Asset Purchase (Details Textual) (USD $)
 6 Months Ended 12 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Mar. 31, 2012
Jul. 09, 2010
Dec. 31, 2007
Asset Purchase (Textual) [Abstract]          
Deposits of close included in purchase       $ 28,000,000  
Loans included in purchase       14,000,000  
Number of years amortized on straight line basis         7 years
Recognition of core deposit intangible asset with Knisely purchase         1,100,000
Recognition of core deposit intangible asset with Hicksville purchase 1,090,000        
Number of years amortized over an estimated remaining economic useful life of deposits 7 years        
Amortization expense   312,000      
Amortization expensed in first half     $ 156,000