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Loans Held for Sale - Composition of Loans Held for Sale (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Receivables Held-for-sale [Abstract]    
Mortgage warehouse loans at fair value $ 1,674,014cubi_MortgageWarehouseLoansHeldForSale $ 1,332,019cubi_MortgageWarehouseLoansHeldForSale
Multi-family loans at lower of cost or fair value 81,193cubi_MultiFamilyCommercialLoansHeldForSale 99,791cubi_MultiFamilyCommercialLoansHeldForSale
Commercial loans held for sale 1,755,207us-gaap_LoansHeldForSaleCommercialRealEstate 1,431,810us-gaap_LoansHeldForSaleCommercialRealEstate
Residential mortgage loans at fair value 2,877us-gaap_LoansHeldForSaleMortgages 3,649us-gaap_LoansHeldForSaleMortgages
Loans held for sale, Carrying Amount $ 1,758,084us-gaap_LoansReceivableHeldForSaleNet $ 1,435,459us-gaap_LoansReceivableHeldForSaleNet