Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Capital stock, par value (in dollars per share)	$ 1	$ 1
Serial preferred stock, shares authorized (in shares)	632,470	632,470
Serial preferred stock, shares issued (in shares)	0	0
Serial preferred stock, shares outstanding (in shares)	0	0
Common stock, shares authorized (in shares)	40,000,000	40,000,000
Common stock, shares issued (in shares)	16,339,722	16,148,791
Treasury stock, shares (in shares)	3,751,993	3,560,010