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SECURITIES AVAILABLE FOR SALE - Narrative (Details)
3 Months Ended
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%