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SECURITIES (Details 3) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Amortized Cost      
Securities pledged to swap counterparties $ 25,875bhlb_SecurityOwnedAndPledgedAsCollateralForInterestRateSwapAmortizedCost $ 26,227bhlb_SecurityOwnedAndPledgedAsCollateralForInterestRateSwapAmortizedCost  
Securities pledged for municipal deposits 41,281bhlb_SecurityOwnedAndPledgedAsCollateralForMunicipalDepositsAmortizedCost 44,777bhlb_SecurityOwnedAndPledgedAsCollateralForMunicipalDepositsAmortizedCost  
Securities pledged, amortized cost 67,156bhlb_SecurityOwnedAndPledgedAsCollateralAmortizedCost 71,004bhlb_SecurityOwnedAndPledgedAsCollateralAmortizedCost  
Fair Value      
Securities pledged to swap counterparties 26,083bhlb_SecurityOwnedAndPledgedAsCollateralForInterestRateSwapFairValue 26,442bhlb_SecurityOwnedAndPledgedAsCollateralForInterestRateSwapFairValue  
Securities pledged for municipal deposits 42,098bhlb_SecurityOwnedAndPledgedAsCollateralForMunicipalDepositsFairValue 44,438bhlb_SecurityOwnedAndPledgedAsCollateralForMunicipalDepositsFairValue  
Securities pledged, fair value 68,181us-gaap_SecurityOwnedAndPledgedAsCollateralFairValue 70,880us-gaap_SecurityOwnedAndPledgedAsCollateralFairValue  
Components of net realized gains and losses on the sale of AFS securities      
Gross realized gains 2,601us-gaap_AvailableForSaleSecuritiesGrossRealizedGains 4,758us-gaap_AvailableForSaleSecuritiesGrossRealizedGains 820us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
Gross realized losses (2,119)us-gaap_AvailableforsaleSecuritiesGrossRealizedLossesExcludingOtherThanTemporaryImpairments   (520)us-gaap_AvailableforsaleSecuritiesGrossRealizedLossesExcludingOtherThanTemporaryImpairments
Net realized gain/(losses) $ 482us-gaap_GainLossOnSaleOfSecuritiesNet $ 4,758us-gaap_GainLossOnSaleOfSecuritiesNet $ 300us-gaap_GainLossOnSaleOfSecuritiesNet