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v2.4.1.9

Summary Of Significant Accounting Policies (Narrative) (Details) | 12 Months Ended
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Dec. 31, 2014 item store
Property, Plant and Equipment [Line Items] |
Number of banking offices | 15 us-gaap_NumberOfStores
Number of reporting units | 1 bhb_NumberOfReportingUnits
Minimum [Member] | Land and Building [Member] |
Property, Plant and Equipment [Line Items] |
Property, Plant and Equipment, Useful Life | 25 years
Minimum [Member] | Furniture and equipment [Member] |
Property, Plant and Equipment [Line Items] |
Property, Plant and Equipment, Useful Life | 3 years
Maximum [Member] | Land and Building [Member] |
Property, Plant and Equipment [Line Items] |
Property, Plant and Equipment, Useful Life | 40 years
Maximum [Member] | Furniture and equipment [Member] |
Property, Plant and Equipment [Line Items] |
Property, Plant and Equipment, Useful Life | 7 years

X
- Definition Number of reporting units. + References No definition available. + Details
Name: | bhb_NumberOfReportingUnits
Namespace Prefix: | bhb_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of stores. + References No definition available. + Details
Name: | us-gaap_NumberOfStores
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- 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_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |