Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share [Abstract]
Net income available to common shareholders	$ 29,839	$ 27,374	$ 86,913	$ 71,408
Less: earnings allocated to participating securities	(281)	(255)	(813)	(679)
Net earnings allocated to common shareholders	29,558	27,119	86,100	70,729
Distributed earnings allocated to common stock	10,554	9,564	29,744	27,220
Undistributed earnings allocated to common stock	$ 19,004	$ 17,555	$ 56,356	$ 43,509
Average shares outstanding (in shares)	14,922	14,776	14,906	14,878
Effect of dilutive securities:
Employee stock awards (in shares)	23	24	22	23
Average shares outstanding, diluted (in shares)	14,945	14,800	14,928	14,901
Basic earnings per common share (in dollars per share)	$ 1.98	$ 1.84	$ 5.78	$ 4.75
Diluted earnings per share (in dollars per share)	$ 1.98	$ 1.83	$ 5.77	$ 4.75