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Loans Held for Sale - Composition of Loans Held for Sale (Detail) (USD $)
In Thousands, unless otherwise specified
9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Total Commercial Loans Held for Sale   $ 1,431,810us-gaap_LoansHeldForSaleCommercialRealEstate $ 740,694us-gaap_LoansHeldForSaleCommercialRealEstate  
Residential mortgage loans at fair value   3,649us-gaap_LoansHeldForSaleMortgages 6,899us-gaap_LoansHeldForSaleMortgages  
Loans held for sale   1,435,459us-gaap_LoansReceivableHeldForSaleNet 747,593us-gaap_LoansReceivableHeldForSaleNet  
Transfer of Portfolio Loans and Leases to Held-for-sale 164,700us-gaap_TransferOfPortfolioLoansAndLeasesToHeldForSale1 164,681us-gaap_TransferOfPortfolioLoansAndLeasesToHeldForSale1 0us-gaap_TransferOfPortfolioLoansAndLeasesToHeldForSale1 0us-gaap_TransferOfPortfolioLoansAndLeasesToHeldForSale1
Transfer of Loans Held-for-sale to Portfolio Loans   18,826us-gaap_TransferOfLoansHeldForSaleToPortfolioLoans1    
Loans held for sale – fair value option        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Mortgage Warehouse Loans Held For Sale   1,332,019cubi_MortgageWarehouseLoansHeldForSale
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cubi_MortgageWarehouseLoansHeldForSaleMember
740,694cubi_MortgageWarehouseLoansHeldForSale
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cubi_MortgageWarehouseLoansHeldForSaleMember
 
Multi-family        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Multi Family Commercial Loans Held For Sale   $ 99,791cubi_MultiFamilyCommercialLoansHeldForSale
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cubi_MultifamilyMember
$ 0cubi_MultiFamilyCommercialLoansHeldForSale
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cubi_MultifamilyMember