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LOANS - Troubled Debt Restructuring Activity (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Trouble Debt Restructuring on Financing Receivables [Roll Forward] |  |  |  |
Balance at beginning of the period | $ 25,185 | $ 43,105 | $ 27,415 | $ 41,990
Principal payments | (375) | (2,511) | (1,788) | (3,150)
TDR status change | 0 | 0 | 0 | 0
Other reductions | 0 | (7,088) | (1,155) | (7,376)
Newly identified TDRs | 279 | 0 | 617 | 2,042
Balance at end of the period | $ 25,089 | $ 33,506 | $ 25,089 | $ 33,506

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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
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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 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

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- 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 Amount of financing receivable modified as troubled debt restructuring. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953676-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118939409&loc=d3e18845-111554 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant