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PREMISES AND EQUIPMENT (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross $ 193,155us-gaap_PropertyPlantAndEquipmentGross $ 186,512us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation (99,522)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (92,876)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Premises and equipment, net 93,633us-gaap_PropertyPlantAndEquipmentNet 93,636us-gaap_PropertyPlantAndEquipmentNet
Land and Land Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross 17,722us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandAndLandImprovementsMember		 15,714us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandAndLandImprovementsMember
Bank Premises [Member]    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross 96,754us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember		 95,275us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
Equipment and Construction in Progress [Member]    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross $ 78,679us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= cbu_EquipmentAndConstructionInProgressMember		 $ 75,523us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= cbu_EquipmentAndConstructionInProgressMember