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OTHER COMMITMENTS, CONTINGENCIES, OFF-BALANCE SHEET ACTIVITIES, AND PANDEMIC IMPACT - Narrative (Details) $ in Millions	Sep. 30, 2022 USD ($) loan	Dec. 31, 2021 USD ($) loan
Commitments and Contingencies Disclosure [Abstract]
Active modified loans | loan	2	19
Active modified loans, carrying value | $	$ 12.5	$ 14.4

X

- Definition

Financing Receivable, Modifications, Active Modified Loans

+ References

No definition available.

+ Details

Name:	bhlb_FinancingReceivableModificationsActiveModifiedLoans
Namespace Prefix:	bhlb_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Financing Receivable, Modifications, Active Modified Loans, Carrying Value

+ References

No definition available.

+ Details

Name:	bhlb_FinancingReceivableModificationsActiveModifiedLoansCarryingValue
Namespace Prefix:	bhlb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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