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Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Consolidated Balance Sheets [Abstract] |  |
Securities available for sale, amortized cost | $ 458,370 us-gaap_AvailableForSaleSecuritiesAmortizedCost | $ 461,635 us-gaap_AvailableForSaleSecuritiesAmortizedCost
Capital stock, par value | $ 2 us-gaap_CommonStockParOrStatedValuePerShare | $ 2 us-gaap_CommonStockParOrStatedValuePerShare
Capital stock, shares authorized | 10,000,000 us-gaap_CommonStockSharesAuthorized | 10,000,000 us-gaap_CommonStockSharesAuthorized
Capital stock, shares issued | 6,788,407 us-gaap_CommonStockSharesIssued | 6,788,407 us-gaap_CommonStockSharesIssued
Prior service cost and unamortized net actuarial losses on employee benefit plans, tax | (251)bhb_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostRecognizedAndUnamortizedNetActuarialLossTax | (192)bhb_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostRecognizedAndUnamortizedNetActuarialLossTax
Net unrealized appreciation (depreciation) on securities available for sale, tax | 3,997 bhb_OtherComprehensiveIncomeNetUnrealizedAppreciationOnSecuritiesAvailableForSaleTax | (4,150)bhb_OtherComprehensiveIncomeNetUnrealizedAppreciationOnSecuritiesAvailableForSaleTax
Portion of OTTI attributable to non-credit gains, tax | 257 bhb_OtherComprehensiveIncomeOtherThanTemporaryImpairmentLossesAttributableToNonCreditLossTax | 252 bhb_OtherComprehensiveIncomeOtherThanTemporaryImpairmentLossesAttributableToNonCreditLossTax
Net unrealized depreciation on derivative instruments, tax | $ 389 bhb_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesTax | $ 0 bhb_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesTax
Treasury stock, shares | 842,082 us-gaap_TreasuryStockShares | 879,840 us-gaap_TreasuryStockShares

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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