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Condensed Financial Information of Parent Company - Condensed Statements of Earnings (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Condensed Financial Statements, Captions [Line Items]
Other expense, net	$ (189,787)	$ (192,903)	$ (198,740)
Net earnings	212,521	177,159	207,827
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Equity in net earnings of subsidiaries	88,099	(34,936)	107,185
Dividends from the Bank	129,000	217,000	106,000
Other expense, net	(4,578)	(4,905)	(5,358)
Net earnings	$ 212,521	$ 177,159	$ 207,827

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