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Consolidated Balance Sheet (Parenthetical) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Consolidated Balance Sheet [Abstract]    
Common stock, no par value      
Common stock, shares authorized 6,500,000 6,500,000
Common stock, shares issued 5,200,000 5,200,000
Common stock, shares outstanding 5,200,000 5,200,000
Treasury stock, shares 515,942 483,663
Unearned stock awards, shares 30,670 29,715