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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
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Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total interest and dividend income | $ 21,994 | $ 22,237 | $ 21,306 | $ 21,641 | $ 22,495 | $ 21,532 | $ 21,418 | $ 21,437 | $ 87,178 | $ 86,882 | $ 71,416
Net interest income | 18,928 | 19,038 | 18,151 | 18,590 | 19,432 | 18,440 | 18,443 | 18,280 | 74,707 | 74,595 | 59,204
Provision for loan losses | 668 | 463 | 486 | 943 | 282 | 1,038 | 1,501 | 1,019 | 2,560 | 3,840 | 6,138
Non-interest income | 4,146 | 3,415 | 4,141 | 3,097 | 4,106 | 3,496 | 3,514 | 3,205 | 14,799 | 14,321 | 13,766
Non-interest expense | 14,816 | 14,427 | 14,121 | 13,093 | 13,669 | 13,150 | 12,608 | 13,261 | 56,457 | 52,688 | 43,813
Net income | $ 5,508 | $ 5,522 | $ 5,602 | $ 5,565 | $ 6,743 | $ 5,548 | $ 5,617 | $ 5,166 | $ 22,197 | $ 23,074 | $ 16,679
Net income per share, basic | $ 0.38 | $ 0.38 | $ 0.39 | $ 0.39 | $ 0.47 | $ 0.39 | $ 0.39 | $ 0.36 | $ 1.54 | $ 1.60 | $ 1.29
Net income per share, diluted | $ 0.38 | $ 0.38 | $ 0.39 | $ 0.39 | $ 0.47 | $ 0.39 | $ 0.39 | $ 0.36 | $ 1.54 | $ 1.60 | $ 1.29

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