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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, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items]                      
Other expense, net                 $ (140,659) $ (126,229) $ (114,028)
Net earnings $ 28,613 $ 27,886 $ 26,813 $ 15,833 $ 25,581 $ 24,295 $ 25,484 $ 28,661 99,145 104,021 95,608
Parent Company [Member]                      
Condensed Financial Statements, Captions [Line Items]                      
Excess in net earnings of subsidiaries                 53,259 66,119 33,149
Dividends from the Bank                 49,000 41,000 63,000
Other expense, net                 (3,114) (3,098) (541)
Net earnings                 $ 99,145 $ 104,021 $ 95,608