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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, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other expense, net |  |  |  |  |  |  |  |  | $ (140,753) | $ (136,740) | $ (140,659)
Net earnings | $ 17,851 | $ 29,683 | $ 28,373 | $ 28,504 | $ 27,076 | $ 25,448 | $ 25,514 | $ 23,391 | 104,411 | 101,429 | 99,145
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Excess in net earnings of subsidiaries |  |  |  |  |  |  |  |  | 50,253 | 55,192 | 53,259
Dividends from the Bank |  |  |  |  |  |  |  |  | 57,000 | 49,000 | 49,000
Other expense, net |  |  |  |  |  |  |  |  | (2,842) | (2,763) | (3,114)
Net earnings |  |  |  |  |  |  |  |  | $ 104,411 | $ 101,429 | $ 99,145

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