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Loans And Allowance For Loan Losses (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
item
loan
Mar. 31, 2014
item
Dec. 31, 2014
loan
Loans And Allowance For Loan Losses [Line Items]      
Number of TDRs past due and classified as non-performing 8bhb_NumberOfTroubledDebtRestructuringsPastDueAndClassifiedAsNonPerforming   7bhb_NumberOfTroubledDebtRestructuringsPastDueAndClassifiedAsNonPerforming
Defaults on loans that had been modified as TDRs 0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1 0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1  
Number of relationships to loans classified as troubled debt restructurings     9bhb_NumberOfRelationshipsToLoansClassifiedAsTroubledDebtRestructurings
Loans $ 482,953us-gaap_NotesReceivableNet   $ 455,734us-gaap_NotesReceivableNet
Loans to relationships classified as TDRs, Total     1,449us-gaap_FinancingReceivableModificationsRecordedInvestment
TDRs past due and classified as non-performing, total amount 364us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1   357us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 0us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing     
Residential Real Estate Mortgages [Member]      
Loans And Allowance For Loan Losses [Line Items]      
Number of TDRs past due and classified as non-performing 1bhb_NumberOfTroubledDebtRestructuringsPastDueAndClassifiedAsNonPerforming
/ us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeAxis
= us-gaap_ResidentialMortgageMember
   
Number of loans, classified as TDRs, to relationships 3bhb_NumberOfLoansClassifiedAsTroubledDebtRestructuringsToRelationships
/ us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeAxis
= us-gaap_ResidentialMortgageMember
   
Number of relationships to loans classified as troubled debt restructurings 3bhb_NumberOfRelationshipsToLoansClassifiedAsTroubledDebtRestructurings
/ us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeAxis
= us-gaap_ResidentialMortgageMember
   
Loans to relationships classified as TDRs, Total 860us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeAxis
= us-gaap_ResidentialMortgageMember
   
TDRs past due and classified as non-performing, total amount 225us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeAxis
= us-gaap_ResidentialMortgageMember
   
Maximum [Member]      
Loans And Allowance For Loan Losses [Line Items]      
Percentage of appraised value of residential real estate loans 80.00%bhb_PercentageOfAppraisedValueOfResidentialRealEstateLoans
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Maximum [Member] | Commercial Real Estate Mortgages [Member]      
Loans And Allowance For Loan Losses [Line Items]      
Number of years for which principally collateralized loans are amortized 20 years    
Maximum [Member] | Residential Real Estate Mortgages [Member]      
Loans And Allowance For Loan Losses [Line Items]      
Number of years for which principally collateralized loans are amortized 30 years    
Minimum [Member] | Commercial Real Estate Mortgages [Member]      
Loans And Allowance For Loan Losses [Line Items]      
Number of years for which principally collateralized loans are amortized 15 years    
Minimum [Member] | Residential Real Estate Mortgages [Member]      
Loans And Allowance For Loan Losses [Line Items]      
Number of years for which principally collateralized loans are amortized 10 years    
Real Estate Secured Loans [Member]      
Loans And Allowance For Loan Losses [Line Items]      
Number of loans, classified as TDRs, to relationships 3bhb_NumberOfLoansClassifiedAsTroubledDebtRestructuringsToRelationships
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
  6bhb_NumberOfLoansClassifiedAsTroubledDebtRestructuringsToRelationships
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
Number of relationships to loans classified as troubled debt restructurings 2bhb_NumberOfRelationshipsToLoansClassifiedAsTroubledDebtRestructurings
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
   
Loans to relationships classified as TDRs, Total 753us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
   
Home Equity Loan [Member]      
Loans And Allowance For Loan Losses [Line Items]      
Number of loans, classified as TDRs, to relationships 1bhb_NumberOfLoansClassifiedAsTroubledDebtRestructuringsToRelationships
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityLoanMember
   
Loans to relationships classified as TDRs, Total 19us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_HomeEquityLoanMember
   
Agricultural And Other Loans To Farmers [Member]      
Loans And Allowance For Loan Losses [Line Items]      
Number of loans, classified as TDRs, to relationships     1bhb_NumberOfLoansClassifiedAsTroubledDebtRestructuringsToRelationships
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bhb_AgriculturalAndOtherLoansToFarmersMember
Number of relationships to loans classified as troubled debt restructurings 2bhb_NumberOfRelationshipsToLoansClassifiedAsTroubledDebtRestructurings
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bhb_AgriculturalAndOtherLoansToFarmersMember
   
Loans to relationships classified as TDRs, Total 113us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= bhb_AgriculturalAndOtherLoansToFarmersMember
   
Commercial And Industrial [Member]      
Loans And Allowance For Loan Losses [Line Items]      
Number of loans, classified as TDRs, to relationships 6bhb_NumberOfLoansClassifiedAsTroubledDebtRestructuringsToRelationships
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
  6bhb_NumberOfLoansClassifiedAsTroubledDebtRestructuringsToRelationships
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Number of relationships to loans classified as troubled debt restructurings 4bhb_NumberOfRelationshipsToLoansClassifiedAsTroubledDebtRestructurings
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
   
Loans 82,497us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
  73,893us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Loans to relationships classified as TDRs, Total 163us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
   
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 0us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
    
Consumer Loans [Member]      
Loans And Allowance For Loan Losses [Line Items]      
Number of loans, classified as TDRs, to relationships 1bhb_NumberOfLoansClassifiedAsTroubledDebtRestructuringsToRelationships
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember
  1bhb_NumberOfLoansClassifiedAsTroubledDebtRestructuringsToRelationships
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember
Loans to relationships classified as TDRs, Total 10us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember
   
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 0us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember
    
Lodging Industry [Member]      
Loans And Allowance For Loan Losses [Line Items]      
Percentage of commercial real estate mortgage portfolio 31.80%bhb_PercentageOfCommercialRealEstateMortgagePortfolio
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_HotelMember
   
Loans $ 114,624us-gaap_NotesReceivableNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_HotelMember
  $ 112,520us-gaap_NotesReceivableNet
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_HotelMember