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Quarterly Financial Data - Summarized Quarterly Financial Data (Detail) - USD ($)
$ / shares in Units, $ 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
Selected Quarterly Financial Information [Abstract]                      
Net interest income $ 65,441 $ 63,161 $ 65,956 $ 62,516 $ 63,258 $ 65,917 $ 62,758 $ 61,009 $ 257,074 $ 252,942 $ 236,514
Recapture of provision for loan losses (4,400) (2,000) 0 0 (1,100) (2,500) (2,000) 0 6,400 5,600 16,100
Net earnings $ 27,076 $ 25,448 $ 25,514 $ 23,391 $ 28,613 $ 27,886 $ 26,813 $ 15,833 $ 101,429 $ 99,145 $ 104,021
Basic earnings per common share $ 0.25 $ 0.23 $ 0.23 $ 0.22 $ 0.27 $ 0.26 $ 0.25 $ 0.15 $ 0.94 $ 0.93 $ 0.98
Diluted earnings per common share $ 0.25 $ 0.23 $ 0.23 $ 0.22 $ 0.27 $ 0.26 $ 0.25 $ 0.15 $ 0.94 $ 0.93 $ 0.98