CONSOLIDATED BALANCE SHEET (Parenthetical) - $ / shares	Dec. 31, 2016	Dec. 31, 2015
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)	$ 8.33	$ 8.33
Common stock, shares authorized (in shares)	15,000,000	15,000,000
Common stock, shares issued (in shares)	5,007,109	5,004,984
Treasury stock, shares (in shares)	272,452	257,852