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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, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items]                      
Other expense, net                 $ (192,903) $ (198,740) $ (179,911)
Net earnings $ 50,056 $ 47,492 $ 41,631 $ 37,980 $ 51,281 $ 50,423 $ 54,481 $ 51,642 177,159 207,827 152,003
Parent Company [Member]                      
Condensed Financial Statements, Captions [Line Items]                      
Equity in net earnings of subsidiaries                 (34,936) 107,185 78,601
Dividends from the Bank                 217,000 106,000 77,800
Other expense, net                 (4,905) (5,358) (4,398)
Net earnings                 $ 177,159 $ 207,827 $ 152,003