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Acquisition Activity - Additional Information (Detail) (New England Commercial Lending Acquisition, USD $)
In Millions, unless otherwise specified
 0 Months Ended 3 Months Ended
Mar. 28, 2013
Office
Mar. 31, 2014
New England Commercial Lending Acquisition
    
Capital Unit [Line Items]    
Adjustable Rate Mortgage Loans Purchased   $ 277.9cubi_AdjustableRateMortgageLoansPurchased
/ us-gaap_BusinessAcquisitionAxis
= cubi_NewEnglandCommercialLendingMember
Purchase price as percentage of loans outstanding 98.70%cubi_LoansAcquisitionPurchasePriceAsPercentageOfLoansOutstanding
/ us-gaap_BusinessAcquisitionAxis
= cubi_NewEnglandCommercialLendingMember		 100.75%cubi_LoansAcquisitionPurchasePriceAsPercentageOfLoansOutstanding
/ us-gaap_BusinessAcquisitionAxis
= cubi_NewEnglandCommercialLendingMember
Commercial loan and related commitments acquired 182.3cubi_AggregateCommercialLoanCommitmentsAcquired
/ us-gaap_BusinessAcquisitionAxis
= cubi_NewEnglandCommercialLendingMember		  
Acquired commercial loan and related commitments outstanding $ 155.1cubi_AcquiredCommercialLoanCommitmentsOutstanding
/ us-gaap_BusinessAcquisitionAxis
= cubi_NewEnglandCommercialLendingMember		  
Number of commercial lending offices 2cubi_NumberOfCommercialLendingOfficesLeasesAssumed
/ us-gaap_BusinessAcquisitionAxis
= cubi_NewEnglandCommercialLendingMember