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Commitments And Contingent Liabilities (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Commitments And Contingencies Disclosure [Abstract] |  |  |
Standby letters of credit terms, in years | 5 years |  |
Rent expense | $ 431 us-gaap_LeaseAndRentalExpense | $ 430 us-gaap_LeaseAndRentalExpense | $ 278 us-gaap_LeaseAndRentalExpense

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- Definition Standby Letters Of Credit Term In Years + References No definition available. + Details
Name: | bhb_StandbyLettersOfCreditTermsInYears
Namespace Prefix: | bhb_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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

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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
Name: | us-gaap_LeaseAndRentalExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration