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INCOME TAXES (Details 4) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Tax credit carryforwards    
Deferred tax asset related to operating loss carryforwards $ 5,538,000bhlb_DeferredTaxAssetsOperatingAndCapitalLossCarryforwards $ 7,731,000bhlb_DeferredTaxAssetsOperatingAndCapitalLossCarryforwards
Alternative minimum tax credit carryforwards 3,800,000bhlb_AlternativeMinimumTaxCreditCarryforwardAmount  
Federal    
Tax credit carryforwards    
Net operating loss carryforwards 13,300,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_InternalRevenueServiceIRSMember
 
Deferred tax asset related to operating loss carryforwards 4,600,000bhlb_DeferredTaxAssetsOperatingAndCapitalLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_InternalRevenueServiceIRSMember
 
State    
Tax credit carryforwards    
Net operating loss carryforwards 11,300,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
 
Deferred tax asset related to operating loss carryforwards 900,000bhlb_DeferredTaxAssetsOperatingAndCapitalLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
 
General business tax credit carryforwards    
Tax credit carryforwards    
Tax credit carryforwards 7,500,000us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_TaxCreditCarryforwardAxis
= us-gaap_GeneralBusinessMember
 
CBT    
Tax credit carryforwards    
Net operating loss carryforwards $ 13,900,000us-gaap_OperatingLossCarryforwards
/ us-gaap_BusinessAcquisitionAxis
= bhlb_ConnecticutBankAndTrustCompanyMember