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SECURITIES AVAILABLE FOR SALE - Narrative (Details) | 3 Months Ended
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Mar. 31, 2017 USD ($) security shares
Obligations of US Government sponsored enterprises |
Investment Holdings [Line Items] |
Available-for-sale, securities in unrealized loss positions (security) | 297
Available for sale securities portfolio, number of securities (security) | 802
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses percentage | 0.40%
US Government-sponsored enterprises |
Investment Holdings [Line Items] |
Available-for-sale, securities in unrealized loss positions (security) | 67
Available for sale securities portfolio, number of securities (security) | 215
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses percentage | 0.30%
Private label |
Investment Holdings [Line Items] |
Available-for-sale, securities in unrealized loss positions (security) | 7
Available for sale securities portfolio, number of securities (security) | 27
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses percentage | 0.26%
Obligations of states and political subdivisions thereof |
Investment Holdings [Line Items] |
Available-for-sale, securities in unrealized loss positions (security) | 143
Available for sale securities portfolio, number of securities (security) | 280
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses percentage | 0.51%
Corporate bonds |
Investment Holdings [Line Items] |
Available-for-sale, securities in unrealized loss positions (security) | 1
Available for sale securities portfolio, number of securities (security) | 6
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses percentage | 0.16%
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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