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BASIS OF PRESENTATION - Additional Information (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lease, right-of-use asset	$ 88,572
Lease, liability	$ 96,168
ASU 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lease, right-of-use asset		$ 79,600
Lease, liability		$ 82,800

X

- Definition

Lease, Liability

+ References

No definition available.

+ Details

Name:	bhlb_LeaseLiability
Namespace Prefix:	bhlb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Lease, Right-of-Use Asset

+ References

No definition available.

+ Details

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

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=us-gaap_AccountingStandardsUpdate201602Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: