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PREMISES AND EQUIPMENT (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Premises and equipment      
Premises and equipment, gross $ 119,706us-gaap_PropertyPlantAndEquipmentGross $ 109,251us-gaap_PropertyPlantAndEquipmentGross  
Accumulated depreciation and amortization (32,427)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (24,792)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment  
Premises and equipment, net 87,279us-gaap_PropertyPlantAndEquipmentNet 84,459us-gaap_PropertyPlantAndEquipmentNet  
Depreciation and amortization expense 8,292us-gaap_DepreciationAndAmortization 7,120us-gaap_DepreciationAndAmortization 6,045us-gaap_DepreciationAndAmortization
Land      
Premises and equipment      
Premises and equipment, gross 10,638us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
10,177us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
 
Buildings and improvements      
Premises and equipment      
Premises and equipment, gross 75,984us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingImprovementsMember
69,873us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingImprovementsMember
 
Buildings and improvements | Minimum      
Premises and equipment      
Estimated Useful Life 5 years    
Buildings and improvements | Maximum      
Premises and equipment      
Estimated Useful Life 39 years    
Furniture and equipment      
Premises and equipment      
Premises and equipment, gross 31,893us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= bhlb_FurnitureAndEquipmentMember
24,865us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= bhlb_FurnitureAndEquipmentMember
 
Furniture and equipment | Minimum      
Premises and equipment      
Estimated Useful Life 3 years    
Furniture and equipment | Maximum      
Premises and equipment      
Estimated Useful Life 7 years    
Construction in process      
Premises and equipment      
Premises and equipment, gross $ 1,191us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember
$ 4,336us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember