Earnings per Share (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 available to common shareholders	$ 21,342	$ 19,814
Less: earnings allocated to participating securities	(200)	(179)
Net earnings allocated to common shareholders	21,142	19,635
Distributed earnings allocated to common stock	8,943	9,037
Undistributed earnings allocated to common stock	$ 12,199	$ 10,598
Average shares outstanding (in shares)	14,974	15,656
Effect of dilutive securities:
Employee stock awards (in shares)	28	31
Average shares outstanding, diluted (in shares)	15,002	15,687
Basic earnings per common share (in dollars per share)	$ 1.41	$ 1.25
Diluted earnings per share (in dollars per share)	$ 1.41	$ 1.25