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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Mortgage Banking (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale, unpaid principal balance	$ 3,700		$ 3,700		$ 0
Residential mortgages | Total residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Forward delivery commitments	11,500		11,500		$ 0
Sale of loans	5,400	$ 11,100	6,100	$ 31,900
Net gains on sales of loans	$ 16	$ 150	$ 8	$ 333

X

- Definition

The amount of forward delivery commitments.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of unpaid principal balance of financing receivable classified as held-for-sale.

+ References

No definition available.

+ Details

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Namespace Prefix:	bhb_
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Balance Type:	credit
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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

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

X

- Definition

Amount of gain (loss) on sale of financing receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 860
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481326/860-20-50-5

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

The cash inflow associated with the sale of loans receivables arising from the financing of goods and services.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-12

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- Details

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Namespace Prefix:
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Balance Type:
Period Type:

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- Details

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