CONSOLIDATED BALANCE SHEET (Parenthetical) - $ / shares	Dec. 31, 2019	Dec. 31, 2018
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)	7,520,740	7,517,546
Common stock, shares outstanding (in shares)	7,040,515	7,037,322
Treasury stock, shares (in shares)	480,225	480,225