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ACQUISITION - Pro Forma Information (Details) - Lake Sunapee - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Business Acquisition [Line Items] |  |
Net interest income | $ 23,208 | $ 22,360
Non-interest income | 6,495 | 7,909
Net income | $ 6,807 | $ 7,016
Pro forma earnings per share, basic (in dollars per share) | $ 0.46 | $ 0.46
Pro forma earnings per share, diluted (in dollars per share) | $ 0.46 | $ 0.46

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