Income Taxes - Summary of Income Tax Provision Reconciled to Income Taxes that Computed at Statutory Federal Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Federal income tax, at statutory rates	$ 26,740	$ 15,703	$ 19,728
Increase (deduction) in taxes resulting from:
Tax-exempt income	(1,114)	(961)	(952)
State income tax, net of federal income tax effect	6,176	2,178	4,322
Excess tax expense (benefits) from employee share-based payments	89	132	(189)
Other, net	403	207	363
Total provision for income taxes	$ 32,294	$ 17,259	$ 23,272