Earnings Per Share - Calculation of Basic and Diluted EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Earnings Per Share [Abstract]
Net income	$ 18,470	$ 17,462
Average Common Shares:
Basic (weighted-average outstanding shares) (in shares)	11,860	11,820
Dilutive potential common shares from stock options (in shares)	56	62
Diluted (weighted-average outstanding shares) (in shares)	11,916	11,882
Basic earnings per share (in dollars per share)	$ 1.56	$ 1.48
Diluted earnings per share (in dollars per share)	$ 1.55	$ 1.47