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Selected Quarterly Financial Data (Unaudited) - Summary of the Unaudited Quarterly Results of Operations (Detail) - USD ($)
$ / shares in Units, $ 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
Quarterly Financial Information Disclosure [Abstract]                      
Net interest income $ 58,699 $ 57,233 $ 56,439 $ 54,768 $ 51,553 $ 51,431 $ 50,868 $ 49,976 $ 227,139 $ 203,828 $ 188,792
Provision for loan losses 3,323 3,276 1,841 72 1,672 2,940 2,804 4,103 8,512 11,519 7,675
Securities transactions 4,412 (22) (330)   52 (146) (65) 100 4,060 (59) 9,269
Noninterest income 32,833 29,169 27,983 28,085 27,431 27,927 26,057 25,617 118,070 107,032 105,808
Noninterest expense 51,251 50,600 48,953 49,588 48,189 49,204 47,720 46,291 200,392 191,404 185,715
Net income $ 19,497 $ 21,710 $ 23,182 $ 22,050 $ 18,620 $ 17,982 $ 17,493 $ 16,579 $ 86,439 $ 70,674 $ 66,170
Net income per common share:                      
Basic $ 0.61 $ 0.68 $ 0.73 $ 0.70 $ 0.60 $ 0.58 $ 0.56 $ 0.53 $ 2.72 $ 2.27 $ 2.13
Diluted $ 0.59 $ 0.67 $ 0.71 $ 0.68 $ 0.58 $ 0.57 $ 0.55 $ 0.52 $ 2.65 $ 2.22 $ 2.09