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SECURITIES AVAILABLE FOR SALE AND HELD TO MATURITY (Details 2) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Available for sale, Amortized Cost    
Within 1 year $ 31,062us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCostBasis  
Over 1 year to 5 years 1,256us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveAmortizedCostBasis  
Over 5 years to 10 years 17,319us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenAmortizedCostBasis  
Over 10 years 171,353us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenAmortizedCostBasis  
Total bonds and obligations 220,990us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis  
Marketable equity securities 38,150us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis  
Residential mortgage-backed securities 815,186us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost  
Amortized Cost 1,074,326us-gaap_AvailableForSaleSecuritiesAmortizedCost 1,075,824us-gaap_AvailableForSaleSecuritiesAmortizedCost
Available for sale, Fair Value    
Within 1 year 30,557us-gaap_AvailableForSaleSecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue  
Over 1 year to 5 years 1,264us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue  
Over 5 years to 10 years 17,698us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue  
Over 10 years 177,911us-gaap_AvailableForSaleSecuritiesDebtMaturitiesRollingAfterYearTenFairValue  
Total bonds and obligations 227,430us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate  
Marketable equity securities 44,766us-gaap_AvailableForSaleSecuritiesEquitySecurities  
Residential mortgage-backed securities 827,460us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue  
Fair Value 1,099,656us-gaap_AvailableForSaleSecurities 1,091,818us-gaap_AvailableForSaleSecurities
Held to maturity, Amortized Cost    
Within 1 year 1,214bhlb_HeldToMaturitySecuritiesDebtMaturitiesNextRollingTwelveMonthsAmortizedCostBasis  
Over 1 year to 5 years 16,802bhlb_HeldToMaturitySecuritiesDebtMaturitiesRollingYearTwoThroughFiveAmortizedCostBasis  
Over 5 years to 10 years 12,232bhlb_HeldToMaturitySecuritiesDebtMaturitiesRollingYearSixThroughTenAmortizedCostBasis  
Over 10 years 12,500bhlb_HeldToMaturitySecuritiesDebtMaturitiesRollingAfterYearTenAmortizedCostBasis  
Total bonds and obligations 42,748us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis  
Residential mortgage-backed securities 70us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateNetCarryingAmount  
Amortized Cost 42,818us-gaap_HeldToMaturitySecurities 43,347us-gaap_HeldToMaturitySecurities
Held to maturity, Fair Value    
Within 1 year 1,214us-gaap_HeldToMaturitySecuritiesDebtMaturitiesNextRollingTwelveMonthsFairValue  
Over 1 year to 5 years 17,774us-gaap_HeldToMaturitySecuritiesDebtMaturitiesRollingYearTwoThroughFiveFairValue  
Over 5 years to 10 years 12,532us-gaap_HeldToMaturitySecuritiesDebtMaturitiesRollingYearSixThroughTenFairValue  
Over 10 years 13,149us-gaap_HeldToMaturitySecuritiesDebtMaturitiesRollingAfterTenYearsFairValue  
Total bonds and obligations 44,669us-gaap_HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValue  
Residential mortgage-backed securities 75us-gaap_HeldToMaturitySecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue  
Fair Value $ 44,744us-gaap_HeldToMaturitySecuritiesFairValue $ 44,997us-gaap_HeldToMaturitySecuritiesFairValue