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Securities Available For Sale (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
security
Dec. 31, 2012
Dec. 31, 2014
security
Schedule of Available for sale Securities [Line Items]      
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities $ 359us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities $ 1,170us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities  
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 423us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1   184us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities 249us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities 853us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities  
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Debt Securities (488)us-gaap_AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossNetOfTaxDebtSecurities   (478)us-gaap_AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossNetOfTaxDebtSecurities
Obligations Of States And Political Subdivisions Thereof [Member]      
Schedule of Available for sale Securities [Line Items]      
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 165us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
  33us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Private Label [Member]      
Schedule of Available for sale Securities [Line Items]      
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities 359us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
  0us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsAvailableforsaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 19us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
  8us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities     249us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetAvailableforsaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Income (Loss), before Tax, Including Portion Attributable to Noncontrolling Interest, Available-for-sale Securities     110us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxIncludingPortionAttributableToNoncontrollingInterestAvailableforsaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Qualitative Disclosures, Number of Positions 3bhb_OtherThanTemporaryImpairmentLossesInvestmentsAvailableForSaleSecuritiesQualitativeDisclosuresNumberOfPositions
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
   
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Number of Positions at Period End     12bhb_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsNumberOfPositionsAtPeriodEnd
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
Private Label [Member] | Marketable Securities, Group One [Member]      
Schedule of Available for sale Securities [Line Items]      
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Number of Positions at Period End     11bhb_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsNumberOfPositionsAtPeriodEnd
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
/ bhb_MarketableSecuritiesGroupingAxis
= bhb_MarketableSecuritiesGroupOneMember
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Debt Securities     482us-gaap_AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossNetOfTaxDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
/ bhb_MarketableSecuritiesGroupingAxis
= bhb_MarketableSecuritiesGroupOneMember
Private Label [Member] | Accumulated Other-than-Temporary Impairment [Member]      
Schedule of Available for sale Securities [Line Items]      
Available-for-sale Equity Securities, Amortized Cost Basis     $ 1,665us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
/ bhb_MarketableSecuritiesGroupingAxis
= us-gaap_AccumulatedOtherThanTemporaryImpairmentMember
US Government Agency [Member]      
Schedule of Available for sale Securities [Line Items]      
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 59us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= bhb_MortgageBackedSecuritiesIssuedByUsGovernmentAgencyMember
  45us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= bhb_MortgageBackedSecuritiesIssuedByUsGovernmentAgencyMember
US Government-Sponsored Enterprises [Member]      
Schedule of Available for sale Securities [Line Items]      
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 180us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
  98us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember