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LOANS - Summary of TDR Activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Trouble Debt Restructuring on Financing Receivables [Roll Forward]
Balance at beginning of year	$ 22,048	$ 16,714
Principal payments	(5,870)	(5,460)
TDR status change	2,235	0
Other reductions	(2,348)	(3,160)
Newly identified TDRs	17,764	13,954
Balance at end of year	$ 33,829	$ 22,048

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

Represents the amount of other reductions which consist of transfer to other real estate owned and charge-offs to loans.

+ References

No definition available.

+ Details

Name:	bhlb_FinancingReceivableTroubledDebtRestructuringOtherReductions
Namespace Prefix:	bhlb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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=25495931&loc=d3e18845-111554

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Recorded Investment
-URI http://asc.fasb.org/extlink&oid=65880944

+ Details

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