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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

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