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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) $ in Millions		12 Months Ended
	Mar. 15, 2020	Dec. 31, 2020	Dec. 31, 2019 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Reserve requirement maximum reduced percentage	0
Reserve requirements			$ 23.1
Period past due to trigger non-accrual status		90 days
Period past due to trigger write-down or write-off		120 days
Period of performance for return to accrual status		6 months
Number of basis points of loan loss reserve		0.95
Number of basis points of loan loss reserve under incurred loss model		0.74

X

- Definition

Number of basis points of loan loss reserve as a percentage of total loans

+ References

No definition available.

+ Details

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X

- Definition

Number of basis points of loan loss reserve under incurred loss model as a percentage of total loans.

+ References

No definition available.

+ Details

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Namespace Prefix:	bhb_
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X

- Definition

Threshold period for when financing receivable that is past due is placed on non-accrual status, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Namespace Prefix:	bhb_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Threshold period of performance of non-accruing financing receivable upon which it is considered for return to accrual status, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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- Definition

Information pertaining to reserve requirement maximum reduced percentage.

+ References

No definition available.

+ Details

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Namespace Prefix:	bhb_
Data Type:	xbrli:pureItemType
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X

- Definition

Cash deposited in a special reserve account for the exclusive benefit of customers pursuant to SEC Regulations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=116631393&loc=SL116631396-227033

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Threshold period for when financing receivable is considered past due to write off as uncollectible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919253-210447

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- References

No definition available.

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