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SECURITIES AVAILABLE FOR SALE - Proceeds from sales, calls and maturities of securities available for sale (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
SECURITIES AVAILABLE FOR SALE
Proceeds from calls/paydowns	$ 28,336	$ 7,739

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- Definition

Amount of cash inflow from prepayments and calls of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

No definition available.

+ Details

Name:	bhb_ProceedsFromPrepaymentsAndCallsOfDebtSecuritiesAvailableForSale
Namespace Prefix:	bhb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

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