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Goodwill And Other Intangible Assets (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Aug. 10, 2012
Schedule Of Goodwill And Other Intangible Assets [Line Items]
Goodwill	$ 4,935us-gaap_Goodwill	$ 4,935us-gaap_Goodwill
Core deposit intangible asset, estimated life	8 years 6 months
Balance of core deposit intangibles	539us-gaap_FiniteLivedIntangibleAssetsNet	562us-gaap_FiniteLivedIntangibleAssetsNet
Expected amortization for 2015	92us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
Expected amortization for 2016	92us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
Expected amortization for 2017	92us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
Expected amortization for 2018	92us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
Expected amortization for 2019	92us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
Expected amortization for 2020	92bhb_FiniteLivedIntangibleAssetsAmortizationExpenseYearSix
Expected amortization for 2021	8bhb_FiniteLivedIntangibleAssetsAmortizationExpenseYearSeven
Border Trust Company [Member]
Schedule Of Goodwill And Other Intangible Assets [Line Items]
Goodwill			$ 1,777us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = bhb_BorderTrustCompanyMember

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Core Deposit Intangible Asset, Estimated Life

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Finite-Lived Intangible Assets, Amortization Expense, Year Seven

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Finite Lived Intangible Assets Amortization Expense Year Six

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(3)

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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