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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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