Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2020	Dec. 31, 2019
Stockholders' Equity
Common stock, par value (in usd per share)	$ 2.00	$ 2.00
Common stock, shares authorized (in shares)	7,500,000	7,500,000
Common stock, shares issued (in shares)	4,954,732	4,948,245
Treasury stock, shares (in shares)	474,632	476,268