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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, 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

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