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Retirement Benefit Plans (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Retirement Benefit Plans [Abstract] |  |  |
Net acuarial losses related to supplemental retirement plans | $ 482 bhb_DefinedBenefitPlanActuarialGainLossRelatedToSupplementalRetirementPlans | $ 373 bhb_DefinedBenefitPlanActuarialGainLossRelatedToSupplementalRetirementPlans |
Supplemental executive retirement plans recognized liabilities | 3,969 bhb_DefinedBenefitPlanSupplementalExecutiveRetirementPlansRecognizedLiabilities | 3,882 bhb_DefinedBenefitPlanSupplementalExecutiveRetirementPlansRecognizedLiabilities |
Net actuarial loss for retirement plan, amortized from accumulated other comprehensive income into net periodic benefit cost | 38 us-gaap_DefinedBenefitPlanAmountToBeAmortizedFromAccumulatedOtherComprehensiveIncomeLossNextFiscalYear |  |
Total expense for 401(k) plan | $ 375 us-gaap_DefinedContributionPlanCostRecognized | $ 356 us-gaap_DefinedContributionPlanCostRecognized | $ 321 us-gaap_DefinedContributionPlanCostRecognized

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- Definition Defined benefit plan, actuarial gain loss related to supplemental retirement plans. + References No definition available. + Details
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- Definition Defined Benefit Plan Supplemental Executive Retirement Plans Recognized Liabilities + References No definition available. + Details
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- Definition Amount included in accumulated other comprehensive income (AOCI) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position, including gain (loss), prior service cost (credit), and transition asset (obligation). + References No definition available. + Details
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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + Details
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- Details
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