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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, 2021	Dec. 31, 2020	Dec. 31, 2019
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%	8.40%	8.40%
Tax-exempt income, rate	(1.10%)	(1.30%)	(1.10%)
Tax credits, rate	(0.60%)	(0.80%)	(0.70%)
Other, net, rate	1.00%	1.70%	1.00%
Provision for income taxes, rate	28.60%	29.00%	28.60%
Federal income tax at statutory rate	$ 62,506	$ 52,399	$ 61,126
State franchise taxes, net of federal benefit	24,600	20,950	24,430
Tax-exempt income	(3,165)	(3,191)	(3,081)
Tax credits	(1,640)	(1,946)	(2,153)
Other, net	2,826	4,149	2,925
Provision for income taxes	$ 85,127	$ 72,361	$ 83,247

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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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