Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Earnings Per Share [Abstract]
Net income available to common shareholders	$ 22,628	$ 29,117	$ 42,433	$ 45,046
Less: earnings allocated to participating securities	244	357	439	510
Net income allocated to common shareholders	$ 22,384	$ 28,760	$ 41,994	$ 44,536
Weighted average number of common shares outstanding - basic (in shares)	65,059	64,828	65,013	64,397
Share-based plans (in shares)	113	161	187	218
Weighted average number of common shares outstanding - diluted (in shares)	65,172	64,989	65,200	64,615
Basic earnings per share (in usd per share)	$ 0.34	$ 0.44	$ 0.65	$ 0.69
Diluted earnings per share (in usd per share)	$ 0.34	$ 0.44	$ 0.64	$ 0.69