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LOANS (Details 6) (USD $)
3 Months Ended
Mar. 31, 2015
item
loan
Mar. 31, 2014
loan
Dec. 31, 2014
Troubled Debt Restructuring      
Borrower's sustained repayment performance period 6 months    
Number of Modifications 3us-gaap_FinancingReceivableModificationsNumberOfContracts2    
Pre-Modification Outstanding Recorded Investment $ 2,156,000us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2    
Post-Modification Outstanding Recorded Investment 2,156,000us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2    
Number of loans restructured within the last twelve months, which subsequently defaulted 0bhlb_TroubledDebtRestructuringNumberOfLoansRestructuredWithinLastTwelveMonthsWhichSubsequentlyDefaulted 0bhlb_TroubledDebtRestructuringNumberOfLoansRestructuredWithinLastTwelveMonthsWhichSubsequentlyDefaulted  
TDR activity      
Balance at beginning of the period 16,714,000us-gaap_FinancingReceivableModificationsRecordedInvestment 10,822,000us-gaap_FinancingReceivableModificationsRecordedInvestment  
Principal payments (484,000)bhlb_FinancingReceivableTroubledDebtRestructuringPrincipalPayments (872,000)bhlb_FinancingReceivableTroubledDebtRestructuringPrincipalPayments  
TDR status change   (52,000)bhlb_FinancingReceivableTroubledDebtRestructuringStatusChange  
Other reductions/increases (1,182,000)bhlb_FinancingReceivableTroubledDebtRestructuringOtherReductions 95,000bhlb_FinancingReceivableTroubledDebtRestructuringOtherReductions  
Newly identified TDRs 2,156,000bhlb_FinancingReceivableTroubledDebtRestructuringAdditions 119,000bhlb_FinancingReceivableTroubledDebtRestructuringAdditions  
Balance at end of the period 17,204,000us-gaap_FinancingReceivableModificationsRecordedInvestment 10,112,000us-gaap_FinancingReceivableModificationsRecordedInvestment  
Residential      
TDR activity      
Foreclosed property 653,000us-gaap_ForeclosedAssets
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
  1,300,000us-gaap_ForeclosedAssets
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
Residential | Mortgages      
TDR activity      
Process of foreclosure 5,100,000us-gaap_SecuritiesReceivedAsCollateralAmountForeclosed
/ us-gaap_FinancialInstrumentAxis
= us-gaap_MortgagesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
   
Residential | Mortgages | 1-4 family      
Troubled Debt Restructuring      
Number of Modifications   1us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancialInstrumentAxis
= us-gaap_MortgagesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= bhlb_Family1To4Member
 
Pre-Modification Outstanding Recorded Investment   122,000us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancialInstrumentAxis
= us-gaap_MortgagesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= bhlb_Family1To4Member
 
Post-Modification Outstanding Recorded Investment   119,000us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancialInstrumentAxis
= us-gaap_MortgagesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialPortfolioSegmentMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= bhlb_Family1To4Member
 
Commercial real estate | Other      
Troubled Debt Restructuring      
Number of Modifications 1us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= bhlb_OtherReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
   
Pre-Modification Outstanding Recorded Investment 2,000,000us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= bhlb_OtherReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
   
Post-Modification Outstanding Recorded Investment 2,000,000us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= bhlb_OtherReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
   
Commercial real estate | Other commercial real estate      
Troubled Debt Restructuring      
Number of Modifications 1us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_CommercialRealEstateMember
   
Pre-Modification Outstanding Recorded Investment 33,000us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_CommercialRealEstateMember
   
Post-Modification Outstanding Recorded Investment 33,000us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_CommercialRealEstateMember
   
Commercial | Construction      
Troubled Debt Restructuring      
Number of Modifications 1us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ConstructionLoansMember
   
Pre-Modification Outstanding Recorded Investment 123,000us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ConstructionLoansMember
   
Post-Modification Outstanding Recorded Investment 123,000us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_ConstructionLoansMember
   
Commercial | Other commercial real estate      
Modifications that subsequently defaulted      
Number of Contracts 1us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_CommercialRealEstateMember
   
Recorded Investment $ 668,000us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
/ us-gaap_MortgageLoansOnRealEstateLoanTypeAxis
= us-gaap_CommercialRealEstateMember