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Disclosures about Fair Value of Financial Instruments - Summary of Financial Assets and Financial Liabilities Measured at Fair Value on Recurring and Nonrecurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other real estate owned $ 13,127us-gaap_OtherRealEstateAndForeclosedAssets $ 15,371us-gaap_OtherRealEstateAndForeclosedAssets
Fair Value Estimate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 4,943cubi_AssetsFairValueDisclosureNonrecurringImpairedLoans
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 2,380cubi_AssetsFairValueDisclosureNonrecurringImpairedLoans
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Other real estate owned 546us-gaap_OtherRealEstateAndForeclosedAssets
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 9,149us-gaap_OtherRealEstateAndForeclosedAssets
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Residential mortgage loan commitments $ 87cubi_ResidentialMortgageLoanRateLockCommitmentsFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 $ 43cubi_ResidentialMortgageLoanRateLockCommitmentsFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Impaired loans | Collateral Appraisal    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Weighted Average 8.00%cubi_WeightedAverageRangeForUnobservableFairValueInputs
/ us-gaap_FinancialInstrumentAxis
= cubi_ImpairedLoansMember
/ us-gaap_ValuationTechniqueAxis
= cubi_CollateralAppraisalMember		 8.00%cubi_WeightedAverageRangeForUnobservableFairValueInputs
/ us-gaap_FinancialInstrumentAxis
= cubi_ImpairedLoansMember
/ us-gaap_ValuationTechniqueAxis
= cubi_CollateralAppraisalMember
Other real estate owned | Collateral Appraisal    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Weighted Average 8.00%cubi_WeightedAverageRangeForUnobservableFairValueInputs
/ us-gaap_FinancialInstrumentAxis
= cubi_OtherRealEstateOwnedMember
/ us-gaap_ValuationTechniqueAxis
= cubi_CollateralAppraisalMember		 8.00%cubi_WeightedAverageRangeForUnobservableFairValueInputs
/ us-gaap_FinancialInstrumentAxis
= cubi_OtherRealEstateOwnedMember
/ us-gaap_ValuationTechniqueAxis
= cubi_CollateralAppraisalMember
Residential mortgage loan commitments | Adjusted Market Bid    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Weighted Average 80.00%cubi_WeightedAverageRangeForUnobservableFairValueInputs
/ us-gaap_FinancialInstrumentAxis
= cubi_ResidentialMortgageLoansCommitmentsMember
/ us-gaap_ValuationTechniqueAxis
= cubi_AdjustedMarketBidMember		 80.00%cubi_WeightedAverageRangeForUnobservableFairValueInputs
/ us-gaap_FinancialInstrumentAxis
= cubi_ResidentialMortgageLoansCommitmentsMember
/ us-gaap_ValuationTechniqueAxis
= cubi_AdjustedMarketBidMember