Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Numerator [Abstract]
Net income	$ 87,939	$ 59,504	$ 64,540
Basic earnings per share [Abstract]
Weighted average shares (in shares)	17,786,000	17,748,000	17,724,000
Diluted earnings per share [Abstract]
Dilutive effect of equity grants (in shares)	18,000	8,000	16,000
Adjusted weighted average shares (in shares)	17,804,000	17,756,000	17,740,000
Earnings per share [Abstract]
Basic earnings per share (in dollars per share)	$ 4.94	$ 3.35	$ 3.64
Diluted earnings per share (in dollars per share)	$ 4.94	$ 3.35	$ 3.64
Options [Member]
Earnings Per Share [Abstract]
Options excluded from diluted calculations (in shares)	0	0	0