Income Taxes - Provision for Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Provision for income taxes:
Deferred income tax benefit	$ (250)	$ (231)
Total provision for income taxes	1,919	1,536
Expected tax expense, at the U.S. federal statutory income tax rate of 21%	1,677	1,369
State income taxes	240	196
FDII benefit	(24)	(33)
Other, net	26	4
Total provision for income taxes	1,919	1,536
Disclosure Other Comprehensive Income Loss Tax Effects Allocation to Component Of Other Comprehensive Income Loss [Abstract]
Net income	1,919	1,536
Other comprehensive loss - marketable securities	(13)
Total	$ 1,906	$ 1,536