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FAIR VALUE MEASUREMENTS - Narrative (Details)	6 Months Ended
	Jun. 30, 2017
Fair Value Disclosures [Abstract]
Junior subordinated debentures re-price period (in days)	90 days

X

- 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