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Consolidated Statements Of Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Consolidated Statements Of Comprehensive Income [Abstract] |  |  |
Net unrealized appreciation (depreciation) on securities available for sale, tax | $ 8,291 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax | $ (7,926)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax | $ 915 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax
Reclassification adjustment for net gains related to securities available for sale included in net income, tax | 138 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax | (230)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax | (658)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax
Other-than-temporary impairment adjustment, tax | 0 bhb_OtherThanTemporaryImpairmentAdjustmentTax | 122 bhb_OtherThanTemporaryImpairmentAdjustmentTax | 398 bhb_OtherThanTemporaryImpairmentAdjustmentTax
Non-credit portion of other-than-temporary impairment losses, tax | 0 bhb_NonCreditPortionOfOtherThanTemporaryImpairmentLossesTax | (37)bhb_NonCreditPortionOfOtherThanTemporaryImpairmentLossesTax | (108)bhb_NonCreditPortionOfOtherThanTemporaryImpairmentLossesTax
Net unrealized depreciation on interest rate derivatives, tax | 389 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax | 0 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax | 0 us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax
Net amortization of prior service cost and actuarial (gain) loss for supplemental executive retirement plan, tax | 0 bhb_OtherComprehensiveIncomeAmortizationOfActuarialGainLossForSupplementalExecutiveRetirementPlanTax | (36)bhb_OtherComprehensiveIncomeAmortizationOfActuarialGainLossForSupplementalExecutiveRetirementPlanTax | (47)bhb_OtherComprehensiveIncomeAmortizationOfActuarialGainLossForSupplementalExecutiveRetirementPlanTax
Actuarial (loss) gain on supplemental executive retirement plan, related tax | $ (59)bhb_OtherComprehensiveIncomeActuarialGainLossOnSupplementalExecutiveRetirementPlanRelatedTax | $ 51 bhb_OtherComprehensiveIncomeActuarialGainLossOnSupplementalExecutiveRetirementPlanRelatedTax | $ (151)bhb_OtherComprehensiveIncomeActuarialGainLossOnSupplementalExecutiveRetirementPlanRelatedTax

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- Definition Other comprehensive income, actuarial gain loss on supplemental executive retirement plan, related tax. + References No definition available. + Details
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- Definition Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of 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 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e640-108580 + Details
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- Definition Amount of tax expense (benefit), before reclassification adjustments, related to increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e640-108580 + Details
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