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SECURITIES (Details 2) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Available for sale, Amortized Cost    
Within 1 year $ 30,732us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost  
Over 1 year to 5 years 1,257us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost  
Over 5 years to 10 years 17,687us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost  
Over 10 years 152,290us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost  
Total bonds and obligations 201,966bhlb_AvailableForSaleDebtMaturitiesBeforeSecuritiesWithoutSingleMaturityDateAmortizedCostBasis  
Marketable equity securities 48,993us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis  
Residential mortgage-backed securities 824,865us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost  
Amortized Cost 1,075,824us-gaap_AvailableForSaleSecuritiesAmortizedCost 769,342us-gaap_AvailableForSaleSecuritiesAmortizedCost
Available for sale, Fair Value    
Within 1 year 29,738us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue  
Over 1 year to 5 years 1,271us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue  
Over 5 years to 10 years 17,944us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue  
Over 10 years 158,271us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue  
Total bonds and obligations 207,224bhlb_AvailableForSaleDebtMaturitiesBeforeSecuritiesWithoutSingleMaturityDateFairValue  
Marketable equity securities 54,942us-gaap_AvailableForSaleSecuritiesEquitySecurities  
Residential mortgage-backed securities 829,652us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue  
Fair Value 1,091,818us-gaap_AvailableForSaleSecurities 760,048us-gaap_AvailableForSaleSecurities
Held to maturity, Amortized Cost    
Within 1 year 1,047us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearNetCarryingAmount  
Over 1 year to 5 years 17,248us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsNetCarryingAmount  
Over 5 years to 10 years 12,360us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount  
Over 10 years 12,622us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount  
Total bonds and obligations 43,277bhlb_HeldToMaturityDebtMaturitiesBeforeSecuritiesWithoutSingleMaturityDateAmortizedCostBasis  
Residential mortgage-backed securities 70us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateNetCarryingAmount  
Amortized Cost 43,347us-gaap_HeldToMaturitySecurities 44,921us-gaap_HeldToMaturitySecurities
Held to maturity, Fair Value    
Within 1 year 1,047us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithinOneYearFairValue  
Over 1 year to 5 years 18,139us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue  
Over 5 years to 10 years 12,524us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue  
Over 10 years 13,213us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue  
Total bonds and obligations 44,923bhlb_HeldToMaturityDebtMaturitiesBeforeSecuritiesWithoutSingleMaturityDateFairValue  
Residential mortgage-backed securities 74us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue  
Fair Value $ 44,997us-gaap_HeldToMaturitySecuritiesFairValue $ 45,764us-gaap_HeldToMaturitySecuritiesFairValue