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FAIR VALUE MEASUREMENTS - Narrative (Details) | 3 Months Ended
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Mar. 31, 2017
Fair Value Disclosures [Abstract] |
Junior subordinated debentures re-price period (in days) | 90 days

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- Definition Represents the re-price period of junior subordinated debentures. + References No definition available. + Details
Name: | bhb_JuniorSubordinatedDebenturesRepricePeriod
Namespace Prefix: | bhb_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_FairValueDisclosuresAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration