Shareholders' Equity (The Company's And The Bank's Regulatory Capital) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital (To Risk-Weighted Assets), Consolidated, Actual Amount	$ 137,311	$ 127,857
Total Capital (To Risk-Weighted Assets), Consolidated, Ratio	16.62%	15.78%
Total Capital (To Risk-Weighted Assets), For Capital Adequacy Purposes, Required Amount	66,106	64,812
Total Capital (To Risk-Weighted Assets), For Capital Adequacy Purposes, Ratio	8.00%	8.00%
Tier 1 Capital (To Risk-Weighted Assets), Consolidated, Actual Amount	123,730	114,667
Tier 1 Capital (To Risk-Weighted Assets), Consolidated, Ratio	14.97%	14.15%
Tier 1 Capital (To Risk-Weighted Assets), For Capital Adequacy Purposes, Required Amount	33,053	32,406
Tier 1 Capital (To Risk-Weighted Assets), For Capital Adequacy Purposes, Ratio	4.00%	4.00%
Tier 1 Capital (To Average Assets), Consolidated, Actual Amount	123,730	114,667
Tier 1 Capital (To Average Assets), Consolidated, Ratio	9.01%	8.87%
Tier 1 Capital (To Average Assets), For Capital Adequacy Purposes, Required Amount	54,954	51,730
Tier 1 Capital (To Average Assets), For Capital Adequacy Purposes, Ratio	4.00%	4.00%
Bar Harbor Bank & Trust [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital (To Risk-Weighted Assets), Consolidated, Actual Amount	138,761	128,791
Total Capital (To Risk-Weighted Assets), Consolidated, Ratio	16.81%	15.92%
Total Capital (To Risk-Weighted Assets), For Capital Adequacy Purposes, Required Amount	66,041	64,718
Total Capital (To Risk-Weighted Assets), For Capital Adequacy Purposes, Ratio	8.00%	8.00%
Total Capital (To Risk-Weighted Assets), To be well Capitalized under Prompt corrective Action provisions, Required Amount	82,551	80,897
Total Capital (To Risk-Weighted Assets), To be well Capitalized under Prompt corrective Action provisions, Ratio	10.00%	10.00%
Tier 1 Capital (To Risk-Weighted Assets), Consolidated, Actual Amount	125,180	115,601
Tier 1 Capital (To Risk-Weighted Assets), Consolidated, Ratio	15.16%	14.29%
Tier 1 Capital (To Risk-Weighted Assets), For Capital Adequacy Purposes, Required Amount	33,020	32,359
Tier 1 Capital (To Risk-Weighted Assets), For Capital Adequacy Purposes, Ratio	4.00%	4.00%
Tier 1 Capital (To Risk-Weighted Assets), To be well Capitalized under Prompt corrective Action provisions, Required Amount	49,531	48,538
Tier 1 Capital (To Risk-Weighted Assets), To be well Capitalized under Prompt corrective Action provisions, Ratio	6.00%	6.00%
Tier 1 Capital (To Average Assets), Consolidated, Actual Amount	125,180	115,601
Tier 1 Capital (To Average Assets), Consolidated, Ratio	9.12%	8.94%
Tier 1 Capital (To Average Assets), For Capital Adequacy Purposes, Required Amount	54,923	51,701
Tier 1 Capital (To Average Assets), For Capital Adequacy Purposes, Ratio	4.00%	4.00%
Tier 1 Capital (To Average Assets), To be well Capitalized under Prompt corrective Action provisions, Required Amount	$ 68,653	$ 64,626
Tier 1 Capital (To Average Assets), To be well Capitalized under Prompt corrective Action provisions, Ratio	5.00%	5.00%