Income Taxes - Components of Consolidated Income Tax Expense (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Current tax expense
Federal									$ 28,763	$ 22,104	$ 20,403
State									18,221	14,586	12,655
Current tax expense, Total									46,984	36,690	33,058
Deferred tax expense
Federal									(872)	(9,500)	695
State									(64)	(4,654)	997
Deferred tax benefit, Total									(936)	(14,154)	1,692
Total tax expense	$ 10,404	$ 11,534	$ 10,767	$ 13,343	$ 8,750	$ 6,622	$ 1,092	$ 6,072	$ 46,048	$ 22,536	$ 34,750