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Securities Available For Sale (Narrative) (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 USD ($) security shares | Dec. 31, 2015 USD ($)
Schedule of Available for sale Securities [Line Items] |  |
OTTI recognized in pre-tax earnings amount, net of tax | $ 401 | $ 462
Unrealized gain, net of tax | 401 | 462
Unrealized losses on securities | 1,103 | 3,041
US Government-Sponsored Enterprises [Member] |  |
Schedule of Available for sale Securities [Line Items] |  |
Unrealized losses on securities | 600 | 2,155
US Government Agencies [Member] |  |
Schedule of Available for sale Securities [Line Items] |  |
Unrealized losses on securities | $ 145 | 547
Private Label [Member] |  |
Schedule of Available for sale Securities [Line Items] |  |
Private-label MBS (debt securities), amount held | security | 10 |
Amortized cost included OTTI losses | $ 1,141 |
Unrealized losses on securities | 20 | 11
Obligations Of States And Political Subdivisions Thereof [Member] |  |
Schedule of Available for sale Securities [Line Items] |  |
Unrealized losses on securities | $ 338 | $ 328
Bar Harbor Bank & Trust [Member] | Visa Class B [Member] |  |
Schedule of Available for sale Securities [Line Items] |  |
Number of Visa Class shares owned | shares | 11,623 |
Bar Harbor Bank & Trust [Member] | Visa Class A [Member] |  |
Schedule of Available for sale Securities [Line Items] |  |
Number of Visa Class shares owned | shares | 19,158 |
Conversion ratio, Visa Class | 1.648 |

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