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SECURITIES AVAILABLE FOR SALE - Narrative (Details) | 6 Months Ended
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Jun. 30, 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 | 18,943
Conversion ratio, Visa Class | 1.6298
Obligations of US Government-sponsored enterprises |
Investment Holdings [Line Items] |
Available for sale securities portfolio, number of securities (security) | 1
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 portfolio, number of securities (security) | 777
Available-for-sale, securities in unrealized loss positions (security) | 495
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses percentage | 3.20%
US Government agency |
Investment Holdings [Line Items] |
Available for sale securities portfolio, number of securities (security) | 200
Available-for-sale, securities in unrealized loss positions (security) | 120
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses percentage | 3.20%
Private label |
Investment Holdings [Line Items] |
Available for sale securities portfolio, number of securities (security) | 26
Available-for-sale, securities in unrealized loss positions (security) | 10
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses percentage | 3.30%
Obligations of states and political subdivisions thereof |
Investment Holdings [Line Items] |
Available for sale securities portfolio, number of securities (security) | 262
Available-for-sale, securities in unrealized loss positions (security) | 119
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses percentage | 3.30%
Corporate bonds |
Investment Holdings [Line Items] |
Available for sale securities portfolio, number of securities (security) | 17
Available-for-sale, securities in unrealized loss positions (security) | 9
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses percentage | 1.80%

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