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Financial Derivative Instruments (Summary of the hedging relationships) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014
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Gross [Member] |
Derivative [Line Items] |
Unrealized losses on interest rate caps | $ (1,111)bhb_UnrealizedLossesOnInterestRateCaps / us-gaap_PositionAxis = bhb_GrossMember
Unamortized premium on interest rate caps | 4,566 us-gaap_DebtInstrumentUnamortizedPremium / us-gaap_PositionAxis = bhb_GrossMember
Total | 3,455 us-gaap_InterestRateDerivativeAssetsAtFairValue / us-gaap_PositionAxis = bhb_GrossMember
Net of Tax [Member] |
Derivative [Line Items] |
Unrealized losses on interest rate caps | (722)bhb_UnrealizedLossesOnInterestRateCaps / us-gaap_PositionAxis = bhb_NetOfTaxMember
Unamortized premium on interest rate caps | 2,968 us-gaap_DebtInstrumentUnamortizedPremium / us-gaap_PositionAxis = bhb_NetOfTaxMember
Total | $ 2,246 us-gaap_InterestRateDerivativeAssetsAtFairValue / us-gaap_PositionAxis = bhb_NetOfTaxMember

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- Definition Unrealized losses on interest rate caps + References No definition available. + Details
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Namespace Prefix: | bhb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The amount of debt premium that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Fair value as of the balance sheet date of interest rate derivative assets, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 + Details
Name: | us-gaap_InterestRateDerivativeAssetsAtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |