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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
May 25, 2005
Shares authorized for issuance of grants under equity compensation plan (in shares)       500,000
Common Shares Class A Non-Voting [Member]
        
Common stock, par value (in dollars per share) $ 1      
Common stock, shares authorized (in shares) 15,000,000 15,000,000 15,000,000  
Common Stock Shares Issued 7,856,485 7,753,730 6,779,878  
Shares available for purchase through retirement plans (in shares) 500,000      
Shares authorized for issuance of grants under equity compensation plan (in shares)       500,000
Common Shares Class B Voting [Member]
        
Common stock, par value (in dollars per share) $ 1      
Common stock, shares authorized (in shares) 1,040,000 1,040,000 1,040,000  
Common Stock Shares Issued 881,452 881,452 881,452