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Income Taxes - Reconciliation of Statutory Income Tax Rate to Consolidated Effective Income Tax Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Federal income tax at statutory rate, rate	21.00%	21.00%	21.00%
State franchise taxes, net of federal benefit, rate	8.30%	8.30%	8.40%
Tax-exempt income, rate	(1.00%)	(1.10%)	(1.30%)
Tax credits, rate	(0.50%)	(0.60%)	(0.80%)
Other, net, rate	0.50%	1.00%	1.70%
Provision for income taxes, rate	28.30%	28.60%	29.00%
Federal income tax at statutory rate	$ 68,953	$ 62,506	$ 52,399
State franchise taxes, net of federal benefit	27,256	24,600	20,950
Tax-exempt income	(3,290)	(3,165)	(3,191)
Tax credits	(1,617)	(1,640)	(1,946)
Other, net	1,620	2,826	4,149
Provision for income taxes	$ 92,922	$ 85,127	$ 72,361

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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