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Securities Available For Sale (Narrative) (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 USD ($) security shares | Dec. 31, 2015 USD ($)
Schedule of Available for sale Securities [Line Items] |  |
Unrealized losses on securities | $ 8,896 | $ 3,041
US Government-Sponsored Enterprises [Member] |  |
Schedule of Available for sale Securities [Line Items] |  |
Unrealized losses on securities | $ 4,865 | $ 2,155
Aggregate unrealized losses represented by percentage of securities in unrealized loss positions | 1.50% | 0.70%
US Government Agencies [Member] |  |
Schedule of Available for sale Securities [Line Items] |  |
Unrealized losses on securities | $ 613 | $ 547
Aggregate unrealized losses represented by percentage of securities in unrealized loss positions | 0.80% | 0.70%
Private Label [Member] |  |
Schedule of Available for sale Securities [Line Items] |  |
Number of private label MBS securities held | security | 4 |
Unrealized gain, net of tax | $ 130 | $ 462
Unrealized losses on securities | $ 11 | $ 11
Aggregate unrealized losses represented by percentage of securities in unrealized loss positions | 1.20% | 0.40%
Obligations Of States And Political Subdivisions Thereof [Member] |  |
Schedule of Available for sale Securities [Line Items] |  |
Unrealized losses on securities | $ 3,407 | $ 328
Aggregate unrealized losses represented by percentage of securities in unrealized loss positions | 2.80% | 0.30%
Accumulated Other-than-Temporary Impairment Attributable to Parent [Member] | Private Label [Member] |  |
Schedule of Available for sale Securities [Line Items] |  |
Amortized cost included OTTI losses | $ 42 |
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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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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