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Selected Quarterly Financial Data (Unaudited) (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]                      
Interest income $ 83,596 $ 81,894 $ 80,443 $ 77,913 $ 77,491 $ 76,045 $ 74,805 $ 73,974 $ 323,846 $ 302,315 $ 291,781
Interest expense 11,696 11,682 11,388 10,878 10,874 11,074 10,895 10,905 45,644 43,748 41,901
Net interest income 71,900 70,212 69,055 67,035 66,617 64,971 63,910 63,069 278,202 258,567 249,880
Provision for loan losses 1,900 500 1,700 1,500 1,200 1,000 1,700 1,500 5,600 5,400 4,350
Net interest income after provision for loan losses 70,000 69,712 67,355 65,535 65,417 63,971 62,210 61,569 272,602 253,167 245,530
Non-interest income 13,301 15,112 14,819 12,465 14,485 14,066 13,824 13,018 55,697 55,393 55,222
Non-interest expense 48,078 46,280 47,340 46,124 47,153 45,850 45,897 44,878 187,822 183,778 180,589
Income before income tax expense 35,223 38,544 34,834 31,876 32,749 32,187 30,137 29,709 140,477 124,782 120,163
Income tax expense 15,740 11,969 10,451 8,368 10,182 9,281 8,781 8,736 46,528 36,980 36,441
Net income $ 19,483 $ 26,575 $ 24,383 $ 23,508 $ 22,567 $ 22,906 $ 21,356 $ 20,973 $ 93,949 $ 87,802 $ 83,722
Basic earnings per share (in dollars per share) $ 0.30 $ 0.41 $ 0.38 $ 0.37 $ 0.35 $ 0.36 $ 0.34 $ 0.33 $ 1.46 $ 1.38 $ 1.33
Diluted earnings per share (in dollars per share) $ 0.30 $ 0.41 $ 0.38 $ 0.37 $ 0.35 $ 0.36 $ 0.34 $ 0.33 $ 1.45 $ 1.38 $ 1.33