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SECURITIES AVAILABLE FOR SALE - Narrative (Details)
12 Months Ended
Dec. 31, 2017
USD ($)
security
shares
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
US Government-sponsored enterprises  
Investment Holdings [Line Items]  
Available-for-sale, securities in unrealized loss positions (security) 369
Available for sale securities portfolio, number of securities (security) 787
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses percentage 1.90%
US Government agency  
Investment Holdings [Line Items]  
Available-for-sale, securities in unrealized loss positions (security) 91
Available for sale securities portfolio, number of securities (security) 207
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses percentage 1.50%
Private label  
Investment Holdings [Line Items]  
Available-for-sale, securities in unrealized loss positions (security) 10
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 3.40%
Obligations of states and political subdivisions thereof  
Investment Holdings [Line Items]  
Available-for-sale, securities in unrealized loss positions (security) 71
Available for sale securities portfolio, number of securities (security) 264
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses percentage 2.00%
Corporate bonds  
Investment Holdings [Line Items]  
Available-for-sale, securities in unrealized loss positions (security) 4
Available for sale securities portfolio, number of securities (security) 14
Available for sale and held to maturity securities, continuous unrealized loss position, aggregate losses percentage 0.60%