Income Taxes - Income Tax Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Current federal income tax	$ 50,429	$ 40,527	$ 45,133
Current state income tax	175	350	447
Deferred federal income tax (expense) benefit	(4,205)	3,531	(5,249)
Income tax expense	$ 46,399	$ 44,408	$ 40,331