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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - Scenario under which CECL ASU had been adopted [Member] $ in Millions	Dec. 31, 2019 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Increase in allowance for credit loss	$ 5.0
Allowance for credit loss	$ 10.0

X

- Definition

Amount of allowance for credit loss.

+ References

No definition available.

+ Details

Name:	bhb_AllowanceForCreditLoss
Namespace Prefix:	bhb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of increase in allowance for credit loss.

+ References

No definition available.

+ Details

Name:	bhb_IncreaseAllowanceForCreditLoss
Namespace Prefix:	bhb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

Name:	srt_StatementScenarioAxis=bhb_ScenarioIfCurrentExpectedCreditLossesAccountingStandardsUpdateHadBeenAdoptedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: