Earnings per Share - Computation of Earnings Per Share (Detail) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Earnings Per Share [Abstract]
Net income	$ 36,343	$ 37,338	$ 31,364	$ 20,374	$ 28,222	$ 27,422	$ 28,362	$ 33,649	$ 125,419	$ 117,655	$ 64,814
Average number of common shares outstanding (in shares)									32,584	29,721	29,917
Effect of dilutive stock options and restricted stock (in shares)									137	161	111
Average number of common shares outstanding used to calculate diluted earnings per share (in shares)									32,721	29,882	30,028
Options excluded from diluted earnings per share because the effect of these options was antidilutive (in shares)									0	0	0