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Disclosures about Fair Value of Financial Instruments - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Jun. 26, 2014
Aug. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Loans held for sale, average life from purchase to sale 20 days    
Senior Notes      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Senior unsecured notes aggregate amount   $ 25.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		  
Senior Notes Due 2018 | Senior Notes      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Senior unsecured notes aggregate amount     $ 63.3us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cubi_SeniorNotesDueTwoThousandAndEighteenMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember