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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, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]                      
Total interest and dividend income $ 24,818 $ 24,958 $ 22,473 $ 22,066 $ 21,994 $ 22,237 $ 21,306 $ 21,641 $ 94,315 $ 87,178 $ 86,882
Net interest income 21,009 21,933 19,403 18,942 18,928 19,038 18,151 18,590 81,287 74,707 74,595
Provision for loan losses 2,111 622 220 1,196 668 463 486 943 4,149 2,560 3,840
Non-interest income 4,622 4,473 4,819 3,777 4,716 3,994 4,653 3,731 17,691 17,094 16,489
Non-interest expense 16,455 17,096 18,753 14,814 15,386 15,006 14,633 13,727 67,118 58,752 54,856
Net income $ 5,040 $ 6,416 $ 4,065 $ 5,019 $ 5,508 $ 5,522 $ 5,602 $ 5,565 $ 20,540 $ 22,197 $ 23,074
Net income per share, basic $ 0.35 $ 0.44 $ 0.28 $ 0.35 $ 0.38 $ 0.38 $ 0.39 $ 0.39 $ 1.42 $ 1.54 $ 1.60
Net income per share, diluted $ 0.35 $ 0.44 $ 0.28 $ 0.35 $ 0.38 $ 0.38 $ 0.39 $ 0.39 $ 1.42 $ 1.54 $ 1.60