XML 66 R49.htm IDEA: XBRL DOCUMENT v3.20.4

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Property, etc. (Details)	12 Months Ended
	Dec. 31, 2020 item
Property, Plant and Equipment [Line Items]
Number of reporting units	1
Enrollment term of employee stock purchase plan	6 months
Premises | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful live of premises and equipment	5 years
Premises | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful live of premises and equipment	39 years
Furniture and equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful live of premises and equipment	3 years
Furniture and equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful live of premises and equipment	7 years

X

- Definition

Enrollment Term of Employee Stock Purchase Plan

+ References

No definition available.

+ Details

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

X

- Definition

Number of reporting units tested for impairment of goodwill. A reporting unit is an operating segment or one level below an operating segment.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfReportingUnits
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

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

X

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

Name:	us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_LandAndBuildingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_FurnitureAndFixturesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: