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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, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]                      
Net interest income $ 66,888 $ 65,673 $ 64,880 $ 63,035 $ 58,699 $ 57,233 $ 56,439 $ 54,768 $ 260,476 $ 227,139 $ 203,828
Provision for loan losses 1,516 747 1,225 314 3,323 3,276 1,841 72 3,802 8,512 11,519
Securities transactions 10 (64) 115 (14) 4,412 (22) (330)   47 4,060 (59)
Noninterest income 31,851 32,801 30,437 30,110 32,833 29,169 27,983 28,085 125,199 118,070 107,032
Noninterest expense 56,166 55,809 54,256 55,890 51,251 50,600 48,953 49,588 222,121 200,392 191,404
Net income $ 32,725 $ 32,883 $ 30,586 $ 29,620 $ 19,497 $ 21,710 $ 23,182 $ 22,050 $ 125,814 $ 86,439 $ 70,674
Net income per common share:                      
Basic $ 1.00 $ 1.01 $ 0.93 $ 0.91 $ 0.61 $ 0.68 $ 0.73 $ 0.70 $ 3.85 $ 2.72 $ 2.27
Diluted $ 0.98 $ 0.98 $ 0.91 $ 0.89 $ 0.59 $ 0.67 $ 0.71 $ 0.68 $ 3.76 $ 2.65 $ 2.22