Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Earnings Per Share [Abstract]
Net income available to common shareholders	$ 22,683	$ 22,148	$ 44,025	$ 41,962
Less: earnings allocated to participating securities	(203)	(206)	(403)	(385)
Net earnings allocated to common shareholders	22,480	21,942	43,622	41,577
Distributed earnings allocated to common stock	8,837	8,921	17,671	17,845
Undistributed earnings allocated to common stock	$ 13,643	$ 13,021	$ 25,951	$ 23,732
Average shares outstanding (in shares)	14,888	15,573	14,930	15,614
Effect of dilutive securities:
Employee stock awards (in shares)	21	21	24	26
Average shares outstanding, diluted (in shares)	14,909	15,594	14,954	15,640
Basic earnings per common share (in dollars per share)	$ 1.51	$ 1.41	$ 2.92	$ 2.66
Diluted earnings per share (in dollars per share)	$ 1.51	$ 1.41	$ 2.92	$ 2.66