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Bank Premises and Equipment - Components of Bank Premises and Equipment (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]    
Premises and equipment, Gross 21,054us-gaap_PropertyPlantAndEquipmentGross $ 19,772us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation (10,244)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (8,147)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Total 10,810us-gaap_PropertyPlantAndEquipmentNet 11,625us-gaap_PropertyPlantAndEquipmentNet
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Premises and equipment, Gross 11,680us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
11,507us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
Leasehold improvements | Minimum    
Property, Plant and Equipment [Line Items]    
Expected Useful Life 3 years  
Leasehold improvements | Maximum    
Property, Plant and Equipment [Line Items]    
Expected Useful Life 25 years  
Furniture, fixtures and equipment    
Property, Plant and Equipment [Line Items]    
Premises and equipment, Gross 4,504us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= cubi_FurnitureFixturesAndEquipmentMember
4,353us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= cubi_FurnitureFixturesAndEquipmentMember
Furniture, fixtures and equipment | Minimum    
Property, Plant and Equipment [Line Items]    
Expected Useful Life 5 years  
Furniture, fixtures and equipment | Maximum    
Property, Plant and Equipment [Line Items]    
Expected Useful Life 10 years  
IT equipment    
Property, Plant and Equipment [Line Items]    
Premises and equipment, Gross 4,696us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= cubi_InformationTechnologyEquipmentAndSoftwareMember
3,740us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= cubi_InformationTechnologyEquipmentAndSoftwareMember
IT equipment | Minimum    
Property, Plant and Equipment [Line Items]    
Expected Useful Life 3 years  
IT equipment | Maximum    
Property, Plant and Equipment [Line Items]    
Expected Useful Life 5 years  
Automobiles    
Property, Plant and Equipment [Line Items]    
Premises and equipment, Gross 174us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_AutomobilesMember
$ 172us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_AutomobilesMember
Automobiles | Minimum    
Property, Plant and Equipment [Line Items]    
Expected Useful Life 5 years  
Automobiles | Maximum    
Property, Plant and Equipment [Line Items]    
Expected Useful Life 10 years