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ALLOWANCE FOR LOAN LOSSES (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2020 USD ($) item
Receivables [Abstract]
Number of reserve components	4
Specific reserve for loans individually evaluated, threshold | $	$ 150
Number of business pools	2
Quantitative reserve, percent of historical charge-off rate	100.00%

X

- Definition

The number of pools into which the entity stratifies its business loans for quantitative and qualitative reserve analysis.

+ References

No definition available.

+ Details

Name:	bhb_AllowanceForLoanLossesNumberOfBusinessPools
Namespace Prefix:	bhb_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The number of reserve components in the allowance for loan losses.

+ References

No definition available.

+ Details

Name:	bhb_AllowanceForLoanLossesNumberOfComponents
Namespace Prefix:	bhb_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The percent of each pool's average 3-year historical net loan charge-off rate that is applied to aggregate recorded investment to determine the quantitative reserve for losses.

+ References

No definition available.

+ Details

Name:	bhb_AllowanceForLoanLossesPercentOfThreeYearChargeOffReserved
Namespace Prefix:	bhb_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- 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

X

- References

No definition available.

+ Details

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