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Loans And Allowance For Loan Losses (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 item | Dec. 31, 2013 item | Dec. 31, 2012 item
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Percentage of appraised value of residential real estate loans | 80.00%bhb_PercentageOfAppraisedValueOfResidentialRealEstateLoans |  |
Other real estate owned | $ 523 us-gaap_OtherRealEstate | $ 1,625 us-gaap_OtherRealEstate | $ 2,780 us-gaap_OtherRealEstate
Financing Receivable, Modifications, Number of Relationships | 9 bhb_FinancingReceivableModificationsNumberOfRelationships | 8 bhb_FinancingReceivableModificationsNumberOfRelationships | 4 bhb_FinancingReceivableModificationsNumberOfRelationships
Financing Receivable, Modifications, Recorded Investment | 1,449 us-gaap_FinancingReceivableModificationsRecordedInvestment | 1,454 us-gaap_FinancingReceivableModificationsRecordedInvestment | 934 us-gaap_FinancingReceivableModificationsRecordedInvestment
Non-Performing Loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | 7 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember | 7 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember | 3 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember
Financing Receivable, Modifications, Recorded Investment | 357 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember | 416 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember | 114 us-gaap_FinancingReceivableModificationsRecordedInvestment / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember
Lodging Industry [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Percentage of commercial real estate mortgage portfolio | 32.90%bhb_PercentageOfCommercialRealEstateMortgagePortfolio / us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeAxis = bhb_LodgingIndustryMember |  |
Loans receivable | 112,520 us-gaap_NotesReceivableNet / us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeAxis = bhb_LodgingIndustryMember | 114,982 us-gaap_NotesReceivableNet / us-gaap_CustomerSecuritiesForWhichEntityHasRightToSellOrRepledgeAxis = bhb_LodgingIndustryMember |
Maximum [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Number of years for which principally collateralized loans are amortized | 20 years |  |
Maximum [Member] | Residential Mortgage [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Number of years for which principally collateralized loans are amortized | 30 years |  |
Minimum [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Number of years for which principally collateralized loans are amortized | 15 years |  |
Minimum [Member] | Residential Mortgage [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Number of years for which principally collateralized loans are amortized | 10 years |  |
Commercial and Industrial Receivable [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | 6 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = bhb_CommercialAndIndustrialReceivableMember | 6 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = bhb_CommercialAndIndustrialReceivableMember | 3 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = bhb_CommercialAndIndustrialReceivableMember
Agricultural and Other Loans to Farmers [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | 1 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_CommercialRealEstateOtherReceivableMember |  |
Residential Real Estate Mortgages [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | 6 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_ResidentialPortfolioSegmentMember | 6 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_ResidentialPortfolioSegmentMember | 4 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_ResidentialPortfolioSegmentMember
Residential Real Estate Mortgages [Member] | Purchased Loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Mortgage Loans on Real Estate, Carrying Amount of Mortgages | $ 114,607 us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = bhb_PurchasedLoansMember | $ 42,830 us-gaap_MortgageLoansOnRealEstateCarryingAmountOfMortgages / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_ResidentialPortfolioSegmentMember / us-gaap_InternalCreditAssessmentAxis = bhb_PurchasedLoansMember |
Other Consumer Loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Financing Receivable, Modifications, Number of Contracts | 1 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_ConsumerOtherFinancingReceivableMember | 1 us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_FinancingReceivableTroubledDebtRestructuringAxis = us-gaap_ConsumerOtherFinancingReceivableMember |

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- Definition Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Article 5 + Details
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