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Fair Value Measurements (Financial Assets And Financial Liabilities Measured At Fair Value On A Non-Recurring Basis) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Other Real Estate Owned [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets and liabilities, fair value	$ 413bhb_AssetsAndLiabilitiesMeasuredAtFairValueNonrecurring / bhb_FairValueAssetsMeasuredOnNonrecurringBasisByAssetClassAxis = bhb_OtherRealEstateOwnedMember	$ 523bhb_AssetsAndLiabilitiesMeasuredAtFairValueNonrecurring / bhb_FairValueAssetsMeasuredOnNonrecurringBasisByAssetClassAxis = bhb_OtherRealEstateOwnedMember
Loss		397us-gaap_GainsLossesOnSalesOfOtherRealEstate / bhb_FairValueAssetsMeasuredOnNonrecurringBasisByAssetClassAxis = bhb_OtherRealEstateOwnedMember
Other Real Estate Owned [Member] | Level 1 Inputs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets and liabilities, fair value
Other Real Estate Owned [Member] | Level 2 Inputs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets and liabilities, fair value
Other Real Estate Owned [Member] | Level 3 Inputs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets and liabilities, fair value	413bhb_AssetsAndLiabilitiesMeasuredAtFairValueNonrecurring / bhb_FairValueAssetsMeasuredOnNonrecurringBasisByAssetClassAxis = bhb_OtherRealEstateOwnedMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member	523bhb_AssetsAndLiabilitiesMeasuredAtFairValueNonrecurring / bhb_FairValueAssetsMeasuredOnNonrecurringBasisByAssetClassAxis = bhb_OtherRealEstateOwnedMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Collateral Dependent Impaired Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets and liabilities, fair value	1,434bhb_AssetsAndLiabilitiesMeasuredAtFairValueNonrecurring / bhb_FairValueAssetsMeasuredOnNonrecurringBasisByAssetClassAxis = bhb_CollateralDependentImpairedLoansMember	1,986bhb_AssetsAndLiabilitiesMeasuredAtFairValueNonrecurring / bhb_FairValueAssetsMeasuredOnNonrecurringBasisByAssetClassAxis = bhb_CollateralDependentImpairedLoansMember
Collateral Dependent Impaired Loans [Member] | Level 1 Inputs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets and liabilities, fair value
Collateral Dependent Impaired Loans [Member] | Level 2 Inputs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets and liabilities, fair value
Collateral Dependent Impaired Loans [Member] | Level 3 Inputs [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial assets and liabilities, fair value	$ 1,434bhb_AssetsAndLiabilitiesMeasuredAtFairValueNonrecurring / bhb_FairValueAssetsMeasuredOnNonrecurringBasisByAssetClassAxis = bhb_CollateralDependentImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member	$ 1,986bhb_AssetsAndLiabilitiesMeasuredAtFairValueNonrecurring / bhb_FairValueAssetsMeasuredOnNonrecurringBasisByAssetClassAxis = bhb_CollateralDependentImpairedLoansMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member

X

- Definition

Assets And Liabilities Measured At Fair Value Nonrecurring

+ References

No definition available.

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X

- Definition

The net gain (loss) resulting from sales and other disposals of other real estate owned, increases (decreases) in the valuation allowance for foreclosed real estate, and write-downs of other real estate owned after acquisition or physical possession.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.14(d))

-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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