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LOANS - Troubled Debt Restructuring Activity (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Trouble Debt Restructuring on Financing Receivables [Roll Forward]
Balance at beginning of the period	$ 41,990	$ 33,829
Principal payments	(639)	(888)
TDR status change	0	0
Other reductions/increases	(288)	(840)
Newly identified TDRs	2,042	2,598
Balance at end of the period	$ 43,105	$ 34,699

X

- Definition

Represents the amount of additions of financing receivables which were newly identified as troubled debt restructurings.

+ References

No definition available.

+ Details

Name:	bhlb_FinancingReceivableTroubledDebtRestructuringAdditions
Namespace Prefix:	bhlb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Financing Receivable Troubled Debt Restructuring Other Increase (Decrease)

+ References

No definition available.

+ Details

Name:	bhlb_FinancingReceivableTroubledDebtRestructuringOtherIncreaseDecrease
Namespace Prefix:	bhlb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents the amount of principal payment of financing receivables modified by troubled debt restructurings.

+ References

No definition available.

+ Details

Name:	bhlb_FinancingReceivableTroubledDebtRestructuringPrincipalPayments
Namespace Prefix:	bhlb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Represents the amount of troubled debt restructurings status change in which troubled debt restructuring loans with a specified interest rate equal to or greater than the rate that the entity was willing to accept at the time of the restructuring for a new loan with comparable risk and the loan was on current payment status and not impaired based on the terms specified by the restructuring agreement.

+ References

No definition available.

+ Details

Name:	bhlb_FinancingReceivableTroubledDebtRestructuringStatusChange
Namespace Prefix:	bhlb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Trouble Debt Restructuring on Financing Receivables [Roll Forward]

+ References

No definition available.

+ Details

Name:	bhlb_TroubleDebtRestructuringonFinancingReceivablesRollForward
Namespace Prefix:	bhlb_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18845-111554

+ Details

Name:	us-gaap_FinancingReceivableModificationsRecordedInvestment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant