CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Sep. 30, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Preferred stock, par or stated value per share (in dollars per share)	$ 0.50	$ 0.50
Preferred stock, shares authorized (in shares)	2,000,000	2,000,000
Preferred stock, shares issued (in shares)	0	0
Common stock, par or stated value per share (in dollars per share)	$ 0.50	$ 0.50
Common stock, shares authorized (in shares)	40,000,000	40,000,000
Common stock, shares, issued (in shares)	15,505,772	15,505,772
Treasury stock, shares (in shares)	1,495,624	1,113,103