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STOCKHOLDERS' EQUITY AND EARNINGS PER COMMON SHARE (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Total capital to risk-weighted assets        
Actual, Amount $ 542,608us-gaap_Capital      
Actual, Ratio (as a percent) 11.38%us-gaap_CapitalToRiskWeightedAssets      
Minimum Capital Requirement, Amount 381,463us-gaap_CapitalRequiredForCapitalAdequacy      
Minimum Capital Requirement, Ratio (as a percent) 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets    
Minimum to be Well Capitalized Under Prompt Corrective Action Provisions, Amount 476,829us-gaap_CapitalRequiredToBeWellCapitalized      
Capital Required to be Well Capitalized to Risk Weighted Assets 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets      
Tier 1 capital to risk-weighted assets        
Actual, Amount 430,374us-gaap_TierOneRiskBasedCapital      
Tier One Risk Based Capital to Risk Weighted Assets 9.03%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets      
Minimum Capital Requirement, Amount 190,731us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy      
Minimum Capital Requirement, Ratio (as a percent) 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets    
Minimum to be Well Capitalized Under Prompt Corrective Action Provisions, Amount 286,097us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized      
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets      
Tier 1 capital to average assets        
Actual, Amount 430,374us-gaap_TierOneLeverageCapital      
Tier One Leverage Capital to Average Assets 7.01%us-gaap_TierOneLeverageCapitalToAverageAssets      
Minimum Capital Requirement, Amount 245,558us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy      
Minimum Capital Requirement, Ratio (as a percent) 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets    
Minimum to be Well Capitalized Under Prompt Corrective Action Provisions, Amount 306,947us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized      
Tier One Leverage Capital Required to be Well Capitalized to Average Assets 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets      
Reconciliation of total stockholders' equity to the bank's regulatory capital        
Total stockholders equity per consolidated financial statements 709,287us-gaap_StockholdersEquity 678,062us-gaap_StockholdersEquity 667,265us-gaap_StockholdersEquity 551,808us-gaap_StockholdersEquity
Adjustments for Bank Tier 1 Capital:        
Net unrealized loss (gain) on available for sale securities (9,916)bhlb_AdjustmentsForTierOneCapitalAvailableForSaleSecuritiesNetUnrealizedGainLoss      
Net unrealized loss on cash flow hedges 3,338bhlb_AdjustmentsForTierOneCapitalUnrealizedGainLossOnCashFlowHedgingInstruments      
Qualifying restricted core capital elements 15,000bhlb_AdjustmentsForTierOneCapitalQualifyingRestrictedCoreCapitalElements      
Disallowed goodwill and other intangible assets (276,270)bhlb_AdjustmentsForTierOneCapitalDisallowedGoodwillAndOtherIntangibleAssets      
Disallowed deferred taxes (11,065)bhlb_AdjustmentsForTierOneCapitalDisallowedDeferredTaxes      
Total Bank Tier 1 Capital 430,374us-gaap_TierOneRiskBasedCapital      
Adjustments for total capital:        
Qualifying subordinated debt 74,283bhlb_AdjustmentsForTotalCapitalQualifyingSubordinatedDebt      
Includible allowances for loan losses 35,722bhlb_AdjustmentsForTotalCapitalUndeductibleLoansAndLeasesReceivableAllowance      
Net unrealized loss on available for sale securities includible in Tier 2 capital 2,229bhlb_AdjustmentsForTotalCapitalAvailableForSaleSecuritiesNetUnrealizedGainLoss      
Total Bank capital per regulatory reporting 542,608us-gaap_Capital      
Bank        
Total capital to risk-weighted assets        
Actual, Amount 513,368us-gaap_Capital
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
486,075us-gaap_Capital
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Actual, Ratio (as a percent) 10.78%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
11.62%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Minimum Capital Requirement, Amount 380,959us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
334,555us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Minimum Capital Requirement, Ratio (as a percent) 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Minimum to be Well Capitalized Under Prompt Corrective Action Provisions, Amount 476,199us-gaap_CapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
418,193us-gaap_CapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Capital Required to be Well Capitalized to Risk Weighted Assets 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Tier 1 capital to risk-weighted assets        
Actual, Amount 440,420us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
416,803us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Tier One Risk Based Capital to Risk Weighted Assets 9.25%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
9.97%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Minimum Capital Requirement, Amount 190,479us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
167,277us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Minimum Capital Requirement, Ratio (as a percent) 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Minimum to be Well Capitalized Under Prompt Corrective Action Provisions, Amount 285,719us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
250,916us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Tier 1 capital to average assets        
Actual, Amount 440,420us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
416,803us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Tier One Leverage Capital to Average Assets 7.18%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
7.99%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Minimum Capital Requirement, Amount 245,494us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
208,685us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Minimum Capital Requirement, Ratio (as a percent) 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Minimum to be Well Capitalized Under Prompt Corrective Action Provisions, Amount 306,867us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
260,857us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Tier One Leverage Capital Required to be Well Capitalized to Average Assets 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Reconciliation of total stockholders' equity to the bank's regulatory capital        
Total stockholders equity per consolidated financial statements 709,287us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
678,062us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Adjustments for Bank Tier 1 Capital:        
Holding company equity adjustment 1,868bhlb_AdjustmentForTierOneCapitalHoldingCompanyEquityAdjustment
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
(3,764)bhlb_AdjustmentForTierOneCapitalHoldingCompanyEquityAdjustment
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Net unrealized loss (gain) on available for sale securities (9,912)bhlb_AdjustmentsForTierOneCapitalAvailableForSaleSecuritiesNetUnrealizedGainLoss
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
5,749bhlb_AdjustmentsForTierOneCapitalAvailableForSaleSecuritiesNetUnrealizedGainLoss
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Net unrealized loss on cash flow hedges 3,338bhlb_AdjustmentsForTierOneCapitalUnrealizedGainLossOnCashFlowHedgingInstruments
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
3,158bhlb_AdjustmentsForTierOneCapitalUnrealizedGainLossOnCashFlowHedgingInstruments
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Disallowed goodwill and other intangible assets (251,748)bhlb_AdjustmentsForTierOneCapitalDisallowedGoodwillAndOtherIntangibleAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
(245,405)bhlb_AdjustmentsForTierOneCapitalDisallowedGoodwillAndOtherIntangibleAssets
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Disallowed deferred taxes (12,413)bhlb_AdjustmentsForTierOneCapitalDisallowedDeferredTaxes
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
(20,997)bhlb_AdjustmentsForTierOneCapitalDisallowedDeferredTaxes
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Total Bank Tier 1 Capital 440,420us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
416,803us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Adjustments for total capital:        
Qualifying subordinated debt 35,000bhlb_AdjustmentsForTotalCapitalQualifyingSubordinatedDebt
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
35,000bhlb_AdjustmentsForTotalCapitalQualifyingSubordinatedDebt
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Includible allowances for loan losses 35,722bhlb_AdjustmentsForTotalCapitalUndeductibleLoansAndLeasesReceivableAllowance
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
33,383bhlb_AdjustmentsForTotalCapitalUndeductibleLoansAndLeasesReceivableAllowance
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Net unrealized loss on available for sale securities includible in Tier 2 capital 2,226bhlb_AdjustmentsForTotalCapitalAvailableForSaleSecuritiesNetUnrealizedGainLoss
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
889bhlb_AdjustmentsForTotalCapitalAvailableForSaleSecuritiesNetUnrealizedGainLoss
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
   
Total Bank capital per regulatory reporting $ 513,368us-gaap_Capital
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
$ 486,075us-gaap_Capital
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember