Computation Of Basic And Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Earnings Per Share [Abstract]
Net income	$ 7,585	$ 2,279	$ 8,766	$ 8,464
Weighted average common shares outstanding - Basic	1,895	1,897	1,896	1,897
Incremental shares outstanding assuming the exercise of dilutive stock options and SARs (share settled)	1	2	0	3
Weighted average common shares outstanding - Diluted	1,896	1,899	1,896	1,900
Basic Earnings per Common Share	$ 4.00	$ 1.20	$ 4.62	$ 4.46
Diluted Earnings per Common Share	$ 4.00	$ 1.20	$ 4.62	$ 4.45