Computation Of Basic And Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share [Abstract]
Net income	$ 7,084	$ 7,913	$ 15,850	$ 16,377
Weighted average common shares outstanding - Basic	1,891	1,897	1,894	1,897
Incremental shares outstanding assuming the exercise of dilutive stock options and SARs (share settled)	0	0	0	1
Weighted average common shares outstanding - Diluted	1,891	1,897	1,894	1,898
Basic Earnings per Common Share	$ 3.75	$ 4.17	$ 8.37	$ 8.63
Diluted Earnings per Common Share	$ 3.75	$ 4.17	$ 8.37	$ 8.63