Earnings Per Share - Calculation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Earnings Per Share Basic [Abstract]
Net income	$ 17,331	$ 19,312
Basic weighted average common shares	19,332,006	19,311,710
Basic earnings per common share	$ 0.90	$ 1.00
Net income	$ 17,331	$ 19,312
Weighted average common shares	19,332,006	19,311,710
Restricted stock	98,818	97,094
Diluted weighted average common shares	19,430,824	19,408,804
Diluted earnings per common share	$ 0.89	$ 0.99