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LOANS - Troubled Debt Restructuring Activity (Details) - USD ($) $ in Thousands | 3 Months Ended
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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

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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 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

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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
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

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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=82895541&loc=d3e18845-111554 + Details
Name: | us-gaap_FinancingReceivableModificationsRecordedInvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant