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Condensed Financial Information of Parent Company - Condensed Statements of Earnings (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Condensed Financial Statements, Captions [Line Items]
Other expense, net	$ (233,583)	$ (229,886)	$ (216,555)
Net earnings	200,716	221,435	235,425
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Equity in undistributed earnings of subsidiaries	89,511	99,932	45,512
Dividends from the Bank	117,000	127,000	195,000
Other expense, net	(6,525)	7,192	(5,087)
Net earnings	$ 199,986	$ 234,124	$ 235,425

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