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SECURITIES AVAILABLE FOR SALE - Narrative (Details) | 6 Months Ended
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Jun. 30, 2017 USD ($) security shares
US Government-sponsored enterprises |
Investment Holdings [Line Items] |
Available-for-sale, securities in unrealized loss positions (security) | 283
Available for sale securities portfolio, number of securities (security) | 797
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses percentage | 1.80%
US Government agency |
Investment Holdings [Line Items] |
Available-for-sale, securities in unrealized loss positions (security) | 65
Available for sale securities portfolio, number of securities (security) | 208
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses percentage | 1.20%
Private label |
Investment Holdings [Line Items] |
Available-for-sale, securities in unrealized loss positions (security) | 9
Available for sale securities portfolio, number of securities (security) | 28
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses percentage | 2.50%
Obligations of states and political subdivisions thereof |
Investment Holdings [Line Items] |
Available-for-sale, securities in unrealized loss positions (security) | 81
Available for sale securities portfolio, number of securities (security) | 273
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses percentage | 3.40%
Corporate bonds |
Investment Holdings [Line Items] |
Available-for-sale, securities in unrealized loss positions (security) | 2
Available for sale securities portfolio, number of securities (security) | 13
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses percentage | 0.40%
Visa Class B | Bar Harbor Bank & Trust |
Investment Holdings [Line Items] |
Carrying value of investment | $ | $ 0
Number of Visa Class shares owned (in shares) | shares | 11,623
Visa Class A | Bar Harbor Bank & Trust |
Investment Holdings [Line Items] |
Number of Visa Class shares owned (in shares) | shares | 19,158
Conversion ratio, Visa Class | 1.648

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