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Asset Purchase (Details Textual) (USD $)
 9 Months Ended 12 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Dec. 31, 2007
Jul. 09, 2010
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 to date this year $ 234,000