Income Taxes - Income Tax Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Current federal income tax	$ 40,527	$ 45,133	$ 33,099
Current state income tax	350	447	150
Deferred federal income tax (expense) benefit	3,531	(5,249)	(29)
Income tax expense	$ 44,408	$ 40,331	$ 33,220