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Fair Value Measurements (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans with a carrying value	6,847us-gaap_ImpairedFinancingReceivableRecordedInvestment	$ 6,134us-gaap_ImpairedFinancingReceivableRecordedInvestment
Impaired loans, allowance	909us-gaap_ImpairedFinancingReceivableRelatedAllowance	964us-gaap_ImpairedFinancingReceivableRelatedAllowance
Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discounts for estimated costs to dispose and other considerations	30.00%bhb_AppraisedValueOfCollateralDiscountForEstimatedCostsToDisposeAndOtherConsiderations / us-gaap_RangeAxis = us-gaap_MaximumMember
Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discounts for estimated costs to dispose and other considerations	10.00%bhb_AppraisedValueOfCollateralDiscountForEstimatedCostsToDisposeAndOtherConsiderations / us-gaap_RangeAxis = us-gaap_MinimumMember
Collateral Dependent Impaired Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans with a carrying value	1,434us-gaap_ImpairedFinancingReceivableRecordedInvestment / bhb_FairValueAssetsMeasuredOnNonrecurringBasisByAssetClassAxis = bhb_CollateralDependentImpairedLoansMember	1,986us-gaap_ImpairedFinancingReceivableRecordedInvestment / bhb_FairValueAssetsMeasuredOnNonrecurringBasisByAssetClassAxis = bhb_CollateralDependentImpairedLoansMember
Impaired loans, allowance	670us-gaap_ImpairedFinancingReceivableRelatedAllowance / bhb_FairValueAssetsMeasuredOnNonrecurringBasisByAssetClassAxis = bhb_CollateralDependentImpairedLoansMember	$ 776us-gaap_ImpairedFinancingReceivableRelatedAllowance / bhb_FairValueAssetsMeasuredOnNonrecurringBasisByAssetClassAxis = bhb_CollateralDependentImpairedLoansMember

X

- Definition

Appraised value of Collateral, Discount For Estimated Costs To Dispose And Other Considerations

+ References

No definition available.

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X

- Definition

Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 14A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953550-111524

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X

- Definition

Amount of allowance for credit losses related to recorded investment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5212-111524

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