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Condensed Financial Information of Parent Company - Condensed Statements of Earnings (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items]
Other expense, net									$ (198,740)	$ (179,911)	$ (140,753)
Net earnings	$ 51,281	$ 50,423	$ 54,481	$ 51,642	$ 43,159	$ 38,558	$ 35,373	$ 34,913	207,827	152,003	104,411
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Excess in net earnings of subsidiaries									107,185	78,601	50,253
Dividends from the Bank									106,000	77,800	57,000
Other expense, net									(5,358)	(4,398)	(2,842)
Net earnings									$ 207,827	$ 152,003	$ 104,411

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