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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, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]                      
Net interest income $ 73,939 $ 72,287 $ 68,792 $ 66,903 $ 66,888 $ 65,673 $ 64,880 $ 63,035 $ 281,921 $ 260,476 $ 227,139
Provision for loan losses 1,412 2,758 2,433 1,684 1,516 747 1,225 314 8,287 3,802 8,512
Securities transactions (9)   821   10 (64) 115 (14) 812 47 4,060
Noninterest income 35,524 35,627 34,077 32,001 31,851 32,801 30,437 30,110 137,229 125,199 118,070
Noninterest expense 66,296 62,191 56,608 56,206 56,166 55,809 54,256 55,890 241,301 222,121 200,392
Net income $ 35,507 $ 33,368 $ 34,167 $ 31,837 $ 32,725 $ 32,883 $ 30,586 $ 29,620 $ 134,879 $ 125,814 $ 86,439
Net income per common share:                      
Basic $ 1.09 $ 1.02 $ 1.04 $ 0.98 $ 1.00 $ 1.01 $ 0.93 $ 0.91 $ 4.13 $ 3.85 $ 2.72
Diluted $ 1.07 $ 1.00 $ 1.02 $ 0.96 $ 0.98 $ 0.98 $ 0.91 $ 0.89 $ 4.05 $ 3.76 $ 2.65