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Quarterly Financial Data (Unaudited) - Unaudited Quarterly Results of Operations (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]                      
Total interest and dividend income $ 28,698 $ 28,069 $ 27,003 $ 25,104 $ 24,818 $ 24,958 $ 22,473 $ 22,066 $ 108,874 $ 94,315 $ 87,178
Net interest income 23,801 23,517 22,989 21,202 21,009 21,933 19,403 18,942 91,509 81,287 74,707
Provision for loan losses 3,105 1,400 1,134 1,016 2,111 622 220 1,196 6,655 4,149 2,560
Non-interest income 5,541 5,032 5,089 5,773 4,622 4,473 4,819 3,777 21,435 17,691 17,094
Non-interest expense 17,588 17,618 17,797 17,034 16,455 17,096 18,753 14,814 70,037 67,118 58,752
Net income $ 3,451 $ 7,246 $ 6,683 $ 6,480 $ 5,040 $ 6,416 $ 4,065 $ 5,019 $ 23,860 $ 20,540 $ 22,197
Net income per share, basic $ 0.23 $ 0.47 $ 0.44 $ 0.43 $ 0.35 $ 0.44 $ 0.28 $ 0.35 $ 1.57 $ 1.42 $ 1.54
Net income per share, diluted $ 0.23 $ 0.47 $ 0.44 $ 0.43 $ 0.35 $ 0.44 $ 0.28 $ 0.35 $ 1.57 $ 1.42 $ 1.54