Earnings Per Common Share and Share Awards Computation Of Basic And Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Earnings Per Share [Abstract]
Net income	$ 39,420	$ 31,458
Weighted Average Shares Outstanding – Basic	1,892	1,888
Incremental shares outstanding assuming the exercise of dilutive SARs (share-settled)	4	8
Weighted average common shares outstanding – Diluted	1,896	1,896
Basic Earnings per Common Share	$ 20.84	$ 16.66
Diluted Earnings per Common Share	$ 20.80	$ 16.59