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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, 2023	Dec. 31, 2022	Dec. 31, 2021
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	8.00%	8.30%	8.30%
State impact of BOLI surrender, net of federal benefit, rate	0.50%	0.00%	0.00%
Federal impact of BOLI surrender and MEC penalty, Rate	1.70%	0.00%	0.00%
Tax-exempt income, rate	(1.60%)	(1.00%)	(1.10%)
Tax credits, rate	(0.40%)	(0.50%)	(0.60%)
Other, net, rate	0.60%	0.50%	1.00%
Provision for income taxes, rate	29.80%	28.30%	28.60%
Federal income tax at statutory rate	$ 66,241	$ 68,953	$ 62,506
State franchise taxes, net of federal benefit	25,139	27,256	24,600
State impact of BOLI surrender, net of federal benefit	1,489	0	0
Federal impact of BOLI surrender and MEC penalty	5,486	0	0
Tax-exempt income	(5,146)	(3,290)	(3,165)
Tax credits	(1,239)	(1,617)	(1,640)
Other, net	2,029	1,620	2,826
Provision for income taxes	$ 93,999	$ 92,922	$ 85,127

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