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CONSOLIDATED BALANCE SHEET (UNAUDITED) (Parenthetical) - $ / shares
Sep. 30, 2021
Dec. 31, 2020
Statement of Financial Position [Abstract]    
Preferred stock, shares authorized (in shares) 3,000,000 3,000,000
Preferred stock, shares issued (in shares) 0 0
Common stock, par value (in dollars per share) $ 5.55 $ 5.55
Common stock, shares authorized (in shares) 22,500,000 22,500,000
Common stock, shares issued (in shares) 7,545,922 7,532,576
Common stock, shares outstanding (in shares) 7,065,697 7,052,351
Treasury stock (in shares) 480,225 480,225