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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, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Condensed Financial Statements, Captions [Line Items]                      
Other expense, net                 $ (136,740) $ (140,659) $ (126,229)
Net earnings $ 27,076 $ 25,448 $ 25,514 $ 23,391 $ 28,613 $ 27,886 $ 26,813 $ 15,833 101,429 99,145 104,021
Parent Company [Member]                      
Condensed Financial Statements, Captions [Line Items]                      
Excess in net earnings of subsidiaries                 55,192 53,259 66,119
Dividends from the Bank                 49,000 49,000 41,000
Other expense, net                 (2,763) (3,114) (3,098)
Net earnings                 $ 101,429 $ 99,145 $ 104,021