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Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Consolidated Balance Sheets [Abstract]
Securities available for sale, amortized cost	$ 470,483us-gaap_AvailableForSaleSecuritiesAmortizedCost	$ 458,370us-gaap_AvailableForSaleSecuritiesAmortizedCost
Capital stock, par value	$ 2us-gaap_CommonStockParOrStatedValuePerShare	$ 2us-gaap_CommonStockParOrStatedValuePerShare
Capital stock, shares authorized	10,000,000us-gaap_CommonStockSharesAuthorized	10,000,000us-gaap_CommonStockSharesAuthorized
Capital stock, shares issued	6,788,407us-gaap_CommonStockSharesIssued	6,788,407us-gaap_CommonStockSharesIssued
Prior service cost and unamortized net actuarial losses on employee benefit plans, tax	(259)bhb_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostRecognizedAndUnamortizedNetActuarialLossTax	(251)bhb_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostRecognizedAndUnamortizedNetActuarialLossTax
Net unrealized appreciation on securities available for sale, tax	4,825bhb_OtherComprehensiveIncomeNetUnrealizedAppreciationOnSecuritiesAvailableForSaleTax	3,997bhb_OtherComprehensiveIncomeNetUnrealizedAppreciationOnSecuritiesAvailableForSaleTax
Portion of OTTI attributable to non-credit losses, tax	221bhb_OtherComprehensiveIncomeOtherThanTemporaryImpairmentLossesAttributableToNonCreditLossTax	257bhb_OtherComprehensiveIncomeOtherThanTemporaryImpairmentLossesAttributableToNonCreditLossTax
Net unrealized appreciation on derivative instruments, tax	$ 598bhb_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesTax	$ 389bhb_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesTax
Treasury stock, shares	829,030us-gaap_TreasuryStockShares	842,082us-gaap_TreasuryStockShares

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Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Tax

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Other Comprehensive Income Defined Benefit Plan Net Prior Service Cost Recognized And Unamortized Net Actuarial Loss Tax

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Other Comprehensive Income Other Than Temporary Impairment Losses Attributable To Non Credit Loss Tax

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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Face amount or stated value per share of common stock.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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