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SECURITIES AVAILABLE FOR SALE - Narrative (Details) | 3 Months Ended
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Mar. 31, 2018 USD ($) security shares
Bar Harbor Bank & Trust | Visa Class B |
Investment Holdings [Line Items] |
Carrying value of investment | $ | $ 0
Number of Visa Class shares owned (in shares) | shares | 11,623
Bar Harbor Bank & Trust | Visa Class A |
Investment Holdings [Line Items] |
Number of Visa Class shares owned (in shares) | shares | 19,158
Conversion ratio, Visa Class | 1.648
Obligations of US Government sponsored enterprises |
Investment Holdings [Line Items] |
Available-for-sale, securities in unrealized loss positions (security) | 1
Available for sale securities portfolio, number of securities (security) | 2
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses percentage | 0.10%
US Government-sponsored enterprises |
Investment Holdings [Line Items] |
Available-for-sale, securities in unrealized loss positions (security) | 455
Available for sale securities portfolio, number of securities (security) | 781
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses percentage | 2.80%
US Government agency |
Investment Holdings [Line Items] |
Available-for-sale, securities in unrealized loss positions (security) | 117
Available for sale securities portfolio, number of securities (security) | 203
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses percentage | 2.70%
Private label |
Investment Holdings [Line Items] |
Available-for-sale, securities in unrealized loss positions (security) | 6
Available for sale securities portfolio, number of securities (security) | 26
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses percentage | 7.90%
Obligations of states and political subdivisions thereof |
Investment Holdings [Line Items] |
Available-for-sale, securities in unrealized loss positions (security) | 122
Available for sale securities portfolio, number of securities (security) | 262
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses percentage | 3.00%
Corporate bonds |
Investment Holdings [Line Items] |
Available-for-sale, securities in unrealized loss positions (security) | 9
Available for sale securities portfolio, number of securities (security) | 16
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses percentage | 1.70%

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