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Securities Available For Sale (Narrative) (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 security | Mar. 31, 2014 | Dec. 31, 2014
Schedule of Available for sale Securities [Line Items] |  |  |
Securities recognized as credit losses in excess of the unrealized losses in accumulated OCI, creating an unrealized gain | 11 bhb_SecuritiesRecognizedAsCreditLossesInExcessOfUnrealizedLossesInAccumulatedOtherComprehensiveIncomeResultingInUnrealizedGain |  |
Total other-than-temporary impairment ("OTTI") losses | $ 0 us-gaap_MarketableSecuritiesRealizedGainLossOtherThanTemporaryImpairmentsAmount | $ 0 us-gaap_MarketableSecuritiesRealizedGainLossOtherThanTemporaryImpairmentsAmount |
Unrealized gain, net of tax | 411,000 us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLossNetOfTax |  | 478,000 us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLossNetOfTax
OTTI recognized in pre-tax earnings amount, net of tax | 411,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossNetOfTaxDebtSecurities |  | 478,000 us-gaap_AccumulatedOtherComprehensiveIncomeLossOtherThanTemporaryImpairmentNotCreditLossNetOfTaxDebtSecurities
Unrealized losses on securities | 1,413,000 us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss |  | 2,332,000 us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
Obligations Of States And Political Subdivisions Thereof [Member] |  |  |
Schedule of Available for sale Securities [Line Items] |  |  |
Unrealized losses on securities | 294,000 us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember |  | 252,000 us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USStatesAndPoliticalSubdivisionsMember
Private Label Mortgage-Backed Securities [Member] |  |  |
Schedule of Available for sale Securities [Line Items] |  |  |
Private-label MBS (debt securities), amount held | 12 bhb_PrivateLabelMortgageBackedSecuritiesAmountHeld / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember |  |
Amortized cost included OTTI losses | 1,577,000 us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionRecognizedInEarningsNetHeldtomaturitySecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember |  |
Unrealized losses on securities | 16,000 us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember |  | 14,000 us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
US Government Agency [Member] |  |  |
Schedule of Available for sale Securities [Line Items] |  |  |
Unrealized losses on securities | 270,000 us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = bhb_MortgageBackedSecuritiesIssuedByUsGovernmentAgencyMember |  | 529,000 us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = bhb_MortgageBackedSecuritiesIssuedByUsGovernmentAgencyMember
US Government-Sponsored Enterprises [Member] |  |  |
Schedule of Available for sale Securities [Line Items] |  |  |
Unrealized losses on securities | $ 833,000 us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember |  | $ 1,537,000 us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember

X
- Definition Private-Label Mortgage Backed Securities, Amount Held + References No definition available. + Details
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- Definition Securities Recognized As Credit Losses In Excess Of The Unrealized Losses In Accumulated Other Comprehensive Income, Resulting In an Unrealized Gain + References No definition available. + Details
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- Definition Total of accumulated other comprehensive loss related to that portion of other than temporary impairment (OTTI) due to factors other than credit losses on debt securities categorized either as available-for-sale or held-to-maturity that an entity does not intend to sell and which it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis of the debt security. The amount represented by this item is net of tax, as applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580 + Details
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- Definition The change in unrealized holding gain (loss), net of tax, on available-for-sale securities included in a separate component of shareholders' equity during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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- Definition Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition This element represents the amount of loss recognized for other than temporary impairments (OTTI) of investments in debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.M) -URI http://asc.fasb.org/extlink&oid=27011274&loc=d3e87990-122713 + Details
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- Definition The amount of other than temporary impairment losses on investments in debt securities categorized as Held-to-maturity which have been recognized in earnings during the period. Such impairment losses consist of other than temporary impairments (OTTI) of investments in debt securities due to credit losses and other than temporary impairments due to other than credit losses when the entity intends to sell an impaired debt security or it is more likely than not that the entity will be required to sell the impaired debt security before recovery of its amortized cost basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 + Details
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