Income Taxes - Schedule of Components of Income Tax Provision (Benefit) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Federal	$ 21,629	$ 22,942	$ 21,330
State	329	282	298
Total current tax provision	21,958	23,224	21,628
Deferred State and Local Income Tax Expense (Benefit)	(5,070)	2,284	3,666
Deferred State and Local Income Tax Expense (Benefit)	(132)	8	(20)
Deferred Income Tax Expense (Benefit)	(5,202)	2,292	3,646
Total tax provision (benefit), Amount	$ 16,756	$ 25,516	$ 25,274