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Loans And Allowance For Loan Losses (Summary Of Troubled Debt Restructures) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015 contract
Financing Receivable, Modifications [Line Items]
Number of Loans	2bhb_FinancingReceivableModificationsNumberOfContracts12
Pre-Modification Outstanding Recorded Investment	$ 490us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
Post-Modification Outstanding Recorded Investment	490us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
Commercial Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	1bhb_FinancingReceivableModificationsNumberOfContracts12 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialLoanMember
Pre-Modification Outstanding Recorded Investment	18us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialLoanMember
Post-Modification Outstanding Recorded Investment	18us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialLoanMember
Agriculture And Other Loans To Farmers [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	1bhb_FinancingReceivableModificationsNumberOfContracts12 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = bhb_AgricultureAndOtherLoansToFarmersMember
Pre-Modification Outstanding Recorded Investment	18us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = bhb_AgricultureAndOtherLoansToFarmersMember
Post-Modification Outstanding Recorded Investment	18us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = bhb_AgricultureAndOtherLoansToFarmersMember
Residential Real Estate Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	1bhb_FinancingReceivableModificationsNumberOfContracts12 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialMortgageMember
Pre-Modification Outstanding Recorded Investment	472us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialMortgageMember
Post-Modification Outstanding Recorded Investment	472us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialMortgageMember
Consumer Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	1bhb_FinancingReceivableModificationsNumberOfContracts12 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = bhb_ConsumerLoansMember
Pre-Modification Outstanding Recorded Investment	472us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = bhb_ConsumerLoansMember
Post-Modification Outstanding Recorded Investment	$ 472us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = bhb_ConsumerLoansMember

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Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 33

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-Topic 310

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-Section 50

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