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Borrowings - Additional Information (Detail) (USD $)
 12 Months Ended 0 Months Ended
Dec. 31, 2014
Jun. 26, 2014
Dec. 31, 2013
Aug. 31, 2013
Jul. 31, 2013
Debt Instrument [Line Items]          
Long-term advances 320,000,000us-gaap_LongTermDebt   $ 95,000,000us-gaap_LongTermDebt    
Federal Home Loan Bank convertible advances 1,618,000,000us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAmountOfAdvancesByBranch   706,500,000us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAmountOfAdvancesByBranch    
Total borrowing capacity with the Federal Home Loan Bank 3,200,000,000us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresMaximumAmountAvailable   1,600,000,000us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresMaximumAmountAvailable    
Total borrowing capacity with the Federal Reserve Bank of Philadelphia 62,700,000cubi_FederalReserveBankMaximumAmountAvailable   92,300,000cubi_FederalReserveBankMaximumAmountAvailable    
Assets secured for advances 1,618,000,000us-gaap_FederalHomeLoanBankAdvances   706,500,000us-gaap_FederalHomeLoanBankAdvances    
Subordinated Debt          
Debt Instrument [Line Items]          
Subordinated debt, interest rate description Three-month LIBOR rate, determined quarterly, plus 2.75% per annum.        
Senior Notes Due 2018          
Debt Instrument [Line Items]          
Interest payable terms Interest payable on March 15, June 15, September 15, and December 15 of each year.        
Blanket Lien on Securities          
Debt Instrument [Line Items]          
Assets secured for advances 342,000,000us-gaap_FederalHomeLoanBankAdvances
/ us-gaap_CreditFacilityAxis
= cubi_BlanketLienMember		        
Qualifying Loans          
Debt Instrument [Line Items]          
Assets secured for advances 2,900,000,000us-gaap_FederalHomeLoanBankAdvances
/ us-gaap_CreditFacilityAxis
= cubi_QualifyingLoansMember		        
Senior Notes          
Debt Instrument [Line Items]          
Issue of subordinated term note   25,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		      
Subordinated debt, average interest rate for the year   4.625%us-gaap_DebtInstrumentInterestRateDuringPeriod
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		      
Senior Notes | Senior Notes Due 2018          
Debt Instrument [Line Items]          
Issue of subordinated term note       63,300,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= cubi_SeniorNotesDueTwoThousandAndEighteenMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		  
Senior unsecured notes aggregate amount       63,300,000us-gaap_DebtLongtermAndShorttermCombinedAmount
/ us-gaap_DebtInstrumentAxis
= cubi_SeniorNotesDueTwoThousandAndEighteenMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 63,300,000us-gaap_DebtLongtermAndShorttermCombinedAmount
/ us-gaap_DebtInstrumentAxis
= cubi_SeniorNotesDueTwoThousandAndEighteenMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Senior unsecured notes, interest rate 6.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= cubi_SeniorNotesDueTwoThousandAndEighteenMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		        
FHLB Convertible Advances          
Debt Instrument [Line Items]          
Federal Home Loan Bank convertible advances 10,000,000us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAmountOfAdvancesByBranch
/ us-gaap_LongtermDebtTypeAxis
= cubi_FederalHomeLoanBankConvertibleAdvancesMember		        
Federal Home Loan Bank Convertible Advances Type One          
Debt Instrument [Line Items]          
Federal Home Loan Bank convertible advances 5,000,000us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAmountOfAdvancesByBranch
/ us-gaap_LongtermDebtTypeAxis
= cubi_FederalHomeLoanBankConvertibleAdvancesTypeOneMember		        
Subordinated debt, basis spread on variable rate 0.17%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= cubi_FederalHomeLoanBankConvertibleAdvancesTypeOneMember		        
Federal Home Loan Bank Convertible Advances Type Two          
Debt Instrument [Line Items]          
Federal Home Loan Bank convertible advances 5,000,000us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAmountOfAdvancesByBranch
/ us-gaap_LongtermDebtTypeAxis
= cubi_FederalHomeLoanBankConvertibleAdvancesTypeTwoMember		        
Subordinated debt, basis spread on variable rate 0.18%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= cubi_FederalHomeLoanBankConvertibleAdvancesTypeTwoMember		        
Senior Subordinated Notes          
Debt Instrument [Line Items]          
Issue of subordinated term note   110,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember		      
Subordinated debt, average interest rate for the year 6.125%us-gaap_DebtInstrumentInterestRateDuringPeriod
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember		        
Subordinated debt, basis spread on variable rate 3.443%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember		        
Debt Instrument, Redemption Price, Percentage   100.00%us-gaap_DebtInstrumentRedemptionPricePercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember		      
Federal Funds Purchased          
Debt Instrument [Line Items]          
Aggregate availability under federal funds line 95,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalFundsPurchasedMember		   $ 35,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalFundsPurchasedMember