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Fair Value Measurements (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Impaired loans with a carrying value | 6,847 us-gaap_ImpairedFinancingReceivableRecordedInvestment | $ 6,134 us-gaap_ImpairedFinancingReceivableRecordedInvestment
Impaired loans, allowance | 909 us-gaap_ImpairedFinancingReceivableRelatedAllowance | 964 us-gaap_ImpairedFinancingReceivableRelatedAllowance
Maximum [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Discounts for estimated costs to dispose and other considerations | 30.00%bhb_AppraisedValueOfCollateralDiscountForEstimatedCostsToDisposeAndOtherConsiderations / us-gaap_RangeAxis = us-gaap_MaximumMember |
Minimum [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Discounts for estimated costs to dispose and other considerations | 10.00%bhb_AppraisedValueOfCollateralDiscountForEstimatedCostsToDisposeAndOtherConsiderations / us-gaap_RangeAxis = us-gaap_MinimumMember |
Collateral Dependent Impaired Loans [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Impaired loans with a carrying value | 1,434 us-gaap_ImpairedFinancingReceivableRecordedInvestment / bhb_FairValueAssetsMeasuredOnNonrecurringBasisByAssetClassAxis = bhb_CollateralDependentImpairedLoansMember | 1,986 us-gaap_ImpairedFinancingReceivableRecordedInvestment / bhb_FairValueAssetsMeasuredOnNonrecurringBasisByAssetClassAxis = bhb_CollateralDependentImpairedLoansMember
Impaired loans, allowance | 670 us-gaap_ImpairedFinancingReceivableRelatedAllowance / bhb_FairValueAssetsMeasuredOnNonrecurringBasisByAssetClassAxis = bhb_CollateralDependentImpairedLoansMember | $ 776 us-gaap_ImpairedFinancingReceivableRelatedAllowance / bhb_FairValueAssetsMeasuredOnNonrecurringBasisByAssetClassAxis = bhb_CollateralDependentImpairedLoansMember

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- Definition Appraised value of Collateral, Discount For Estimated Costs To Dispose And Other Considerations + References No definition available. + Details
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- Definition Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953550-111524 + Details
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- Definition Amount of allowance for credit losses related to recorded investment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5212-111524 + Details
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