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Intangible Assets (Details Textual) (USD $)
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Core deposit intangible assets [Member]
     
Intangible Assets (Textual) [Abstract]      
2012 $ 400,000    
2013 1,300,000    
2014 1,100,000    
2015 1,100,000    
2016 900,000    
2017 and thereafter 2,000,000    
Mortgage servicing rights [Member]
     
Intangible Assets (Textual) [Abstract]      
Impairment valuation allowance $ 0 $ 0 $ 0