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LOANS - Summary of TDR Activity (Details) - USD ($) $ in Thousands | 12 Months Ended
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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

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- Definition Represents the amount of additions of financing receivables which were newly identified as troubled debt restructurings. + References No definition available. + Details
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Namespace Prefix: | bhlb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- 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

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- 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

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- 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
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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

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- 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