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SECURITIES AVAILABLE FOR SALE - Narrative (Details) $ in Thousands | 1 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) security shares | Sep. 30, 2018 security shares | Dec. 31, 2017 shares
Investment Holdings [Line Items] |  |  |
Shares sold (in shares) | shares | 4,700 |  |
Gain on sale of stock | $ | $ 685 |  |
Visa Class B |  |  |
Investment Holdings [Line Items] |  |  |
Visa shares obtained from IPO (in shares) | shares |  |  | 11,623
Visa shares acquired through business combination (in shares) | shares |  |  | 3,919
Number of Visa Class shares owned (in shares) | shares | 10,842 | 10,842 | 15,542
Bar Harbor Bank & Trust | Visa Class A |  |  |
Investment Holdings [Line Items] |  |  |
Conversion ratio, Visa Class | 1.6298 | 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) |  | 769 |
Available-for-sale, securities in unrealized loss positions (security) | 516 | 516 |
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses percentage |  | 4.00% |
US Government agency |  |  |
Investment Holdings [Line Items] |  |  |
Available for sale securities portfolio, number of securities (security) |  | 197 |
Available-for-sale, securities in unrealized loss positions (security) | 132 | 132 |
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses percentage |  | 2.90% |
Private label |  |  |
Investment Holdings [Line Items] |  |  |
Available for sale securities portfolio, number of securities (security) |  | 21 |
Available-for-sale, securities in unrealized loss positions (security) | 8 | 8 |
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses percentage |  | 3.00% |
Obligations of states and political subdivisions thereof |  |  |
Investment Holdings [Line Items] |  |  |
Available for sale securities portfolio, number of securities (security) |  | 258 |
Available-for-sale, securities in unrealized loss positions (security) | 149 | 149 |
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses percentage |  | 3.90% |
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) | 10 | 10 |
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses percentage |  | 2.40% |

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