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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%