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ALLOWANCE FOR LOAN LOSSES - Narrative (Details) $ in Thousands	Sep. 30, 2019 USD ($)
Receivables [Abstract]
Specific reserve for loans individually evaluated, loan relationships with an aggregate balance (in excess)	$ 150

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- Definition

Allowance for Loan and Lease Loss, Minimum Aggregate Balance, Individually Evaluated for Specific Reserve

+ References

No definition available.

+ Details

Name:	bhb_AllowanceforLoanandLeaseLossMinimumAggregateBalanceIndividuallyEvaluatedforSpecificReserve
Namespace Prefix:	bhb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

Name:	us-gaap_ReceivablesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration