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Loans And Allowance For Loan Losses (Schedule Of Loans With Credit Quality Indicators) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Financing Receivable, Recorded Investment [Line Items] |  |
Commercial loan | $ 482,953 us-gaap_NotesReceivableNet | $ 455,734 us-gaap_NotesReceivableNet
Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Commercial loan | 446,521 us-gaap_NotesReceivableNet / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember | 417,939 us-gaap_NotesReceivableNet / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember
Other Assets Especially Mentioned [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Commercial loan | 18,950 us-gaap_NotesReceivableNet / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember | 19,043 us-gaap_NotesReceivableNet / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember
Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Commercial loan | 17,482 us-gaap_NotesReceivableNet / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember | 18,752 us-gaap_NotesReceivableNet / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember
Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Commercial loan |  |
Loss [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Commercial loan |  |
Commercial Real Estate Mortgages [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Commercial loan | 343,183 us-gaap_NotesReceivableNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateMember | 325,949 us-gaap_NotesReceivableNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateMember
Commercial Real Estate Mortgages [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Commercial loan | 319,509 us-gaap_NotesReceivableNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember | 302,376 us-gaap_NotesReceivableNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember
Commercial Real Estate Mortgages [Member] | Other Assets Especially Mentioned [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Commercial loan | 11,425 us-gaap_NotesReceivableNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember | 11,501 us-gaap_NotesReceivableNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember
Commercial Real Estate Mortgages [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Commercial loan | 12,249 us-gaap_NotesReceivableNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember | 12,072 us-gaap_NotesReceivableNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstateMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember
Commercial Real Estate Mortgages [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Commercial loan |  |
Commercial Real Estate Mortgages [Member] | Loss [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Commercial loan |  |
Commercial And Industrial [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Commercial loan | 82,497 us-gaap_NotesReceivableNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember | 73,893 us-gaap_NotesReceivableNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember
Commercial And Industrial [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Commercial loan | 72,206 us-gaap_NotesReceivableNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember | 62,226 us-gaap_NotesReceivableNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember
Commercial And Industrial [Member] | Other Assets Especially Mentioned [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Commercial loan | 6,535 us-gaap_NotesReceivableNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember | 7,349 us-gaap_NotesReceivableNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember
Commercial And Industrial [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Commercial loan | 3,756 us-gaap_NotesReceivableNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember | 4,318 us-gaap_NotesReceivableNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember
Commercial And Industrial [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Commercial loan |  |
Commercial And Industrial [Member] | Loss [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Commercial loan |  |
Commercial Construction And Land Development [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Commercial loan | 25,725 us-gaap_NotesReceivableNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = bhb_CommercialConstructionAndLandDevelopmentMember | 25,421 us-gaap_NotesReceivableNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = bhb_CommercialConstructionAndLandDevelopmentMember
Commercial Construction And Land Development [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Commercial loan | 23,666 us-gaap_NotesReceivableNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = bhb_CommercialConstructionAndLandDevelopmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember | 23,290 us-gaap_NotesReceivableNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = bhb_CommercialConstructionAndLandDevelopmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember
Commercial Construction And Land Development [Member] | Other Assets Especially Mentioned [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Commercial loan | 799 us-gaap_NotesReceivableNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = bhb_CommercialConstructionAndLandDevelopmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember |
Commercial Construction And Land Development [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Commercial loan | 1,260 us-gaap_NotesReceivableNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = bhb_CommercialConstructionAndLandDevelopmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember | 2,131 us-gaap_NotesReceivableNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = bhb_CommercialConstructionAndLandDevelopmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember
Commercial Construction And Land Development [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Commercial loan |  |
Commercial Construction And Land Development [Member] | Loss [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Commercial loan |  |
Agriculture And Other Loans To Farmers [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Commercial loan | 31,548 us-gaap_NotesReceivableNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = bhb_AgricultureAndOtherLoansToFarmersMember | 30,471 us-gaap_NotesReceivableNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = bhb_AgricultureAndOtherLoansToFarmersMember
Agriculture And Other Loans To Farmers [Member] | Pass [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Commercial loan | 31,140 us-gaap_NotesReceivableNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = bhb_AgricultureAndOtherLoansToFarmersMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember | 30,047 us-gaap_NotesReceivableNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = bhb_AgricultureAndOtherLoansToFarmersMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember
Agriculture And Other Loans To Farmers [Member] | Other Assets Especially Mentioned [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Commercial loan | 191 us-gaap_NotesReceivableNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = bhb_AgricultureAndOtherLoansToFarmersMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember | 193 us-gaap_NotesReceivableNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = bhb_AgricultureAndOtherLoansToFarmersMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SpecialMentionMember
Agriculture And Other Loans To Farmers [Member] | Substandard [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Commercial loan | 217 us-gaap_NotesReceivableNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = bhb_AgricultureAndOtherLoansToFarmersMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember | 231 us-gaap_NotesReceivableNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = bhb_AgricultureAndOtherLoansToFarmersMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_SubstandardMember
Agriculture And Other Loans To Farmers [Member] | Doubtful [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Commercial loan |  |
Agriculture And Other Loans To Farmers [Member] | Loss [Member] |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Commercial loan |  |

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