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Condensed Financial Information - Parent Company Only (Statements Of Cash Flow) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Cash flows from operating activities: |  |  |  |  |  |
Net income | $ 14,613 us-gaap_NetIncomeLoss |  | $ 13,183 us-gaap_NetIncomeLoss |  | $ 12,466 us-gaap_NetIncomeLoss |
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |
Depreciation | 1,629 us-gaap_Depreciation |  | 1,504 us-gaap_Depreciation |  | 1,292 us-gaap_Depreciation |
Recognition of stock based expense | 418 us-gaap_StockOptionPlanExpense |  | 265 us-gaap_StockOptionPlanExpense |  | 216 us-gaap_StockOptionPlanExpense |
Net change in other assets | 6,213 us-gaap_IncreaseDecreaseInOtherOperatingAssets |  | (752)us-gaap_IncreaseDecreaseInOtherOperatingAssets |  | (711)us-gaap_IncreaseDecreaseInOtherOperatingAssets |
Net change in other liabilities | 546 us-gaap_IncreaseDecreaseInOtherOperatingLiabilities |  | (139)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities |  | 1,790 us-gaap_IncreaseDecreaseInOtherOperatingLiabilities |
Net cash provided by operating activities | 15,531 us-gaap_NetCashProvidedByUsedInOperatingActivities |  | 21,560 us-gaap_NetCashProvidedByUsedInOperatingActivities |  | 21,091 us-gaap_NetCashProvidedByUsedInOperatingActivities |
Cash flows from investing activities: |  |  |  |  |  |
Capital expenditures | (2,002)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment |  | (2,394)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment |  | (3,894)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment |
Net cash used in investing activities | (70,150)us-gaap_NetCashProvidedByUsedInInvestingActivities |  | (100,638)us-gaap_NetCashProvidedByUsedInInvestingActivities |  | (92,370)us-gaap_NetCashProvidedByUsedInInvestingActivities |
Cash flows from financing activities: |  |  |  |  |  |
Purchase of Treasury Stock | (8)us-gaap_PaymentsForRepurchaseOfCommonStock |  | (24)us-gaap_PaymentsForRepurchaseOfCommonStock |  | (181)us-gaap_PaymentsForRepurchaseOfCommonStock |
Proceeds from stock option exercises | 453 us-gaap_ProceedsFromStockOptionsExercised |  | 345 us-gaap_ProceedsFromStockOptionsExercised |  | 1,174 us-gaap_ProceedsFromStockOptionsExercised |
Dividend paid | (5,362)us-gaap_PaymentsOfDividendsCommonStock |  | (4,915)us-gaap_PaymentsOfDividendsCommonStock |  | (4,565)us-gaap_PaymentsOfDividendsCommonStock |
Net cash used in financing activities | 55,219 us-gaap_NetCashProvidedByUsedInFinancingActivities |  | 73,286 us-gaap_NetCashProvidedByUsedInFinancingActivities |  | 77,551 us-gaap_NetCashProvidedByUsedInFinancingActivities |
Net (decrease) increase in cash | 600 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease |  | (5,792)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease |  | 6,272 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease |
Cash and cash equivalents at beginning of period | 9,200 us-gaap_CashAndCashEquivalentsAtCarryingValue |  | 14,992 us-gaap_CashAndCashEquivalentsAtCarryingValue |  | 8,720 us-gaap_CashAndCashEquivalentsAtCarryingValue |
Cash and cash equivalents at end of period | 9,800 us-gaap_CashAndCashEquivalentsAtCarryingValue |  | 9,200 us-gaap_CashAndCashEquivalentsAtCarryingValue |  | 14,992 us-gaap_CashAndCashEquivalentsAtCarryingValue |
Bar Harbor Bankshares [Member] |  |  |  |  |  |
Cash flows from operating activities: |  |  |  |  |  |
Net income | 14,613 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 13,183 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 12,466 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |
Depreciation |  |  | 1 us-gaap_Depreciation / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 3 us-gaap_Depreciation / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Recognition of stock based expense | 418 us-gaap_StockOptionPlanExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 265 us-gaap_StockOptionPlanExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 216 us-gaap_StockOptionPlanExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Net change in other assets | (189)us-gaap_IncreaseDecreaseInOtherOperatingAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 331 us-gaap_IncreaseDecreaseInOtherOperatingAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | (865)us-gaap_IncreaseDecreaseInOtherOperatingAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Net change in other liabilities | 415 us-gaap_IncreaseDecreaseInOtherOperatingLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 389 us-gaap_IncreaseDecreaseInOtherOperatingLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 663 us-gaap_IncreaseDecreaseInOtherOperatingLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Equity in undistributed earnings of subsidiaries | (10,141)us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | [1] | (9,468)us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | [1] | (9,137)us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | [1]
Net cash provided by operating activities | 5,116 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 4,701 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 3,346 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Cash flows from investing activities: |  |  |  |  |  |
Capital expenditures | (1)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | (1)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | (3)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Net cash used in investing activities | (1)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | (1)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | (3)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Cash flows from financing activities: |  |  |  |  |  |
Purchase of Treasury Stock | (8)us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | (24)us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | (181)us-gaap_PaymentsForRepurchaseOfCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Proceeds from stock option exercises | 616 us-gaap_ProceedsFromStockOptionsExercised / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 461 us-gaap_ProceedsFromStockOptionsExercised / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 1,187 us-gaap_ProceedsFromStockOptionsExercised / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Dividend paid | (5,362)us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | (4,915)us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | (4,565)us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Net cash used in financing activities | (4,754)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | (4,478)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | (3,559)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Net (decrease) increase in cash | 361 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 222 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | (216)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Cash and cash equivalents at beginning of period | 760 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 538 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 754 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Cash and cash equivalents at end of period | $ 1,121 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | $ 760 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | $ 538 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
[1] | Amount in parentheses represents the excess of dividends over net income subsidiaries.

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- Definition The noncash expense that accounts for the value of stock or unit options distributed to employees as compensation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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