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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
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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

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