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Asset Purchase (Details Textual) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Dec. 31, 2007
Dec. 31, 2007
Knisely [Member]
Jul. 09, 2010
Hicksville [Member]
Asset Purchase (Additional Textual) [Abstract]          
Recognition of core deposit intangible asset with acquired purchase       $ 1,100,000 $ 1,090,000
Asset Purchase (Textual) [Abstract]          
Number of years amortized on straight line basis     7 years    
Number of years amortized over an estimated remaining economic useful life of deposits 7 years        
Amortization expense 313,000 312,000      
Amortization expensed to date this year $ 78,000