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DEPOSITS - Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Deposits [Abstract]
Brokered time deposits	$ 459.1	$ 378.7
Reciprocal deposits	$ 33.2	$ 49.7

X

- Definition

Represents the amount of time deposits placed by or through the assistance of a deposit broker, also known as brokered deposit liabilities.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the reciprocal deposits.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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