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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 | 8 bhb_NumberOfTroubledDebtRestructuringsPastDueAndClassifiedAsNonPerforming |  | 7 bhb_NumberOfTroubledDebtRestructuringsPastDueAndClassifiedAsNonPerforming
Defaults on loans that had been modified as TDRs | 0 us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1 | 0 us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1 |
Number of relationships to loans classified as troubled debt restructurings |  |  | 9 bhb_NumberOfRelationshipsToLoansClassifiedAsTroubledDebtRestructurings
Loans | $ 482,953 us-gaap_NotesReceivableNet |  | $ 455,734 us-gaap_NotesReceivableNet
Loans to relationships classified as TDRs, Total |  |  | 1,449 us-gaap_FinancingReceivableModificationsRecordedInvestment
TDRs past due and classified as non-performing, total amount | 364 us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1 |  | 357 us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing | 0 us-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 | 1 bhb_NumberOfTroubledDebtRestructuringsPastDueAndClassifiedAsNonPerforming / us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeAxis = us-gaap_ResidentialMortgageMember |  |
Number of loans, classified as TDRs, to relationships | 3 bhb_NumberOfLoansClassifiedAsTroubledDebtRestructuringsToRelationships / us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeAxis = us-gaap_ResidentialMortgageMember |  |
Number of relationships to loans classified as troubled debt restructurings | 3 bhb_NumberOfRelationshipsToLoansClassifiedAsTroubledDebtRestructurings / us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeAxis = us-gaap_ResidentialMortgageMember |  |
Loans to relationships classified as TDRs, Total | 860 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeAxis = us-gaap_ResidentialMortgageMember |  |
TDRs past due and classified as non-performing, total amount | 225 us-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 | 3 bhb_NumberOfLoansClassifiedAsTroubledDebtRestructuringsToRelationships / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember |  | 6 bhb_NumberOfLoansClassifiedAsTroubledDebtRestructuringsToRelationships / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Number of relationships to loans classified as troubled debt restructurings | 2 bhb_NumberOfRelationshipsToLoansClassifiedAsTroubledDebtRestructurings / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember |  |
Loans to relationships classified as TDRs, Total | 753 us-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 | 1 bhb_NumberOfLoansClassifiedAsTroubledDebtRestructuringsToRelationships / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_HomeEquityLoanMember |  |
Loans to relationships classified as TDRs, Total | 19 us-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 |  |  | 1 bhb_NumberOfLoansClassifiedAsTroubledDebtRestructuringsToRelationships / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = bhb_AgriculturalAndOtherLoansToFarmersMember
Number of relationships to loans classified as troubled debt restructurings | 2 bhb_NumberOfRelationshipsToLoansClassifiedAsTroubledDebtRestructurings / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = bhb_AgriculturalAndOtherLoansToFarmersMember |  |
Loans to relationships classified as TDRs, Total | 113 us-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 | 6 bhb_NumberOfLoansClassifiedAsTroubledDebtRestructuringsToRelationships / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember |  | 6 bhb_NumberOfLoansClassifiedAsTroubledDebtRestructuringsToRelationships / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember
Number of relationships to loans classified as troubled debt restructurings | 4 bhb_NumberOfRelationshipsToLoansClassifiedAsTroubledDebtRestructurings / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember |  |
Loans | 82,497 us-gaap_NotesReceivableNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember |  | 73,893 us-gaap_NotesReceivableNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember
Loans to relationships classified as TDRs, Total | 163 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember |  |
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing | 0 us-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 | 1 bhb_NumberOfLoansClassifiedAsTroubledDebtRestructuringsToRelationships / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerLoanMember |  | 1 bhb_NumberOfLoansClassifiedAsTroubledDebtRestructuringsToRelationships / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerLoanMember
Loans to relationships classified as TDRs, Total | 10 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerLoanMember |  |
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing | 0 us-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 | $ 114,624 us-gaap_NotesReceivableNet / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_HotelMember |  | $ 112,520 us-gaap_NotesReceivableNet / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_HotelMember

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