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DEPOSITS - Narrative (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
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Deposits [Abstract] |  |
Brokered deposits | $ 378.7 | $ 526.9
Reciprocal deposits | $ 79.3 | $ 64.1

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