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EMPLOYEE BENEFIT PLANS (Details 2) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Level 1      
Employee benefit plans      
Fair value   $ 3,475us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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Level 2      
Employee benefit plans      
Fair value   2,045us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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= us-gaap_FairValueInputsLevel2Member
 
Equity mutual funds | Large-cap | Level 1      
Employee benefit plans      
Fair value   1,515us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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= us-gaap_EquityFundsMember
 
Equity mutual funds | Small-cap | Level 1      
Employee benefit plans      
Fair value   792us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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= us-gaap_EquityFundsMember
 
Equity mutual funds | International | Level 1      
Employee benefit plans      
Fair value   637us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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= us-gaap_EquityFundsMember
 
Equity trusts | Large-cap | Level 2      
Employee benefit plans      
Fair value   1,015us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_EquitySecuritiesByEntitySizeAxis
= bhlb_LargeCapMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_InvestmentTypeAxis
= bhlb_EquityTrustsMember
 
Fixed income trusts | Level 2      
Employee benefit plans      
Fair value   1,030us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_InvestmentTypeAxis
= bhlb_FixedIncomeTrustsMember
 
Fixed income mutual funds      
Pension Plan Assets      
Target Allocation (as a percent) 34.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedIncomeFundsMember
   
Fixed income mutual funds | Level 1      
Employee benefit plans      
Fair value   531us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedIncomeFundsMember
 
Marketable equity securities      
Pension Plan Assets      
Target Allocation (as a percent) 65.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquitySecuritiesMember
   
Cash and Cash Equivalents.      
Pension Plan Assets      
Target Allocation (as a percent) 1.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_CashAndCashEquivalentsMember
   
Pension Plans      
Employee benefit plans      
Fair value 5,756us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
5,520us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
4,595us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
Transfers between Level 1, 2, and 3 0bhlb_FairValueInstrumentsTransfersBetweenLevels
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= us-gaap_PensionPlansDefinedBenefitMember
0bhlb_FairValueInstrumentsTransfersBetweenLevels
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
 
Pension Plans | Level 1      
Employee benefit plans      
Fair value 99us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
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= us-gaap_FairValueInputsLevel1Member
   
Pension Plans | Level 2      
Employee benefit plans      
Fair value 5,657us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
   
Pension Plans | Level 3      
Employee benefit plans      
Fair value 0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
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= us-gaap_FairValueInputsLevel3Member
0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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= us-gaap_PensionPlansDefinedBenefitMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
 
Pension Plans | Equity mutual funds | Large-cap      
Employee benefit plans      
Fair value 1,847us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
/ us-gaap_EquitySecuritiesByEntitySizeAxis
= bhlb_LargeCapMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquityFundsMember
1,515us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
/ us-gaap_EquitySecuritiesByEntitySizeAxis
= bhlb_LargeCapMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquityFundsMember
 
Pension Plans | Equity mutual funds | Large-cap | Level 2      
Employee benefit plans      
Fair value 1,847us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
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/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquityFundsMember
   
Pension Plans | Equity mutual funds | Small-cap      
Employee benefit plans      
Fair value 488us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
/ us-gaap_EquitySecuritiesByEntitySizeAxis
= bhlb_SmallCapMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquityFundsMember
792us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
/ us-gaap_EquitySecuritiesByEntitySizeAxis
= bhlb_SmallCapMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquityFundsMember
 
Pension Plans | Equity mutual funds | Small-cap | Level 2      
Employee benefit plans      
Fair value 488us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
/ us-gaap_EquitySecuritiesByEntitySizeAxis
= bhlb_SmallCapMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquityFundsMember
   
Pension Plans | Equity mutual funds | International      
Employee benefit plans      
Fair value 461us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
/ us-gaap_EquitySecuritiesByEntitySizeAxis
= bhlb_InternationalMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquityFundsMember
637us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
/ us-gaap_EquitySecuritiesByEntitySizeAxis
= bhlb_InternationalMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquityFundsMember
 
Pension Plans | Equity mutual funds | International | Level 2      
Employee benefit plans      
Fair value 461us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
/ us-gaap_EquitySecuritiesByEntitySizeAxis
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/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquityFundsMember
   
Pension Plans | Equity trusts      
Employee benefit plans      
Fair value 926us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
/ us-gaap_InvestmentTypeAxis
= bhlb_EquityTrustsMember
   
Pension Plans | Equity trusts | Level 2      
Employee benefit plans      
Fair value 926us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
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/ us-gaap_InvestmentTypeAxis
= bhlb_EquityTrustsMember
   
Pension Plans | Equity trusts | Large-cap      
Employee benefit plans      
Fair value   1,015us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
/ us-gaap_EquitySecuritiesByEntitySizeAxis
= bhlb_LargeCapMember
/ us-gaap_InvestmentTypeAxis
= bhlb_EquityTrustsMember
 
Pension Plans | Fixed income trusts      
Employee benefit plans      
Fair value 1,822us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
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= bhlb_FixedIncomeTrustsMember
1,030us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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= us-gaap_PensionPlansDefinedBenefitMember
/ us-gaap_InvestmentTypeAxis
= bhlb_FixedIncomeTrustsMember
 
Pension Plans | Fixed income trusts | Level 2      
Employee benefit plans      
Fair value 1,822us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_InvestmentTypeAxis
= bhlb_FixedIncomeTrustsMember
   
Pension Plans | Fixed income mutual funds      
Employee benefit plans      
Fair value 212us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedIncomeFundsMember
531us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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= us-gaap_PensionPlansDefinedBenefitMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedIncomeFundsMember
 
Pension Plans | Fixed income mutual funds | Level 1      
Employee benefit plans      
Fair value 99us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
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= us-gaap_FairValueInputsLevel1Member
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedIncomeFundsMember
   
Pension Plans | Fixed income mutual funds | Level 2      
Employee benefit plans      
Fair value 113us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
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= us-gaap_FixedIncomeFundsMember