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Loss Contingency - Additional Information (Detail) (USD $)
 3 Months Ended 12 Months Ended
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Loss Contingencies [Line Items]          
Loan Held for Sale Exposed to Fraud   $ 5,200,000cubi_LoansHeldForSaleInvolvedInFraud      
Loan Held for Sale Range of possible loss, Minimum   1,500,000us-gaap_LossContingencyRangeOfPossibleLossMinimum      
Loan Held For Sale Range of possible loss, Maximum   3,200,000us-gaap_LossContingencyRangeOfPossibleLossMaximum      
Loss contingency provided by management   2,000,000us-gaap_LossContingencyLossInPeriod 0us-gaap_LossContingencyLossInPeriod 2,000,000us-gaap_LossContingencyLossInPeriod 0us-gaap_LossContingencyLossInPeriod
Loan held for sale not exposed to fraud 1,000,000cubi_LoansHeldForSaleNotInvolvedInFraud        
Loans recovered in cash from alleged perpetrator 1,500,000cubi_LoansRecoveredInCash        
Loans transferred to other assets 2,700,000cubi_LoansTransferredToOtherAssets        
Reserve transferred to other assets 2,000,000cubi_LoansContingencyTransferredToOtherAssets        
Fraud on Loans Held for Sale | Other assets          
Loss Contingencies [Line Items]          
Other Receivables, Net     $ 600,000us-gaap_LossContingencyReceivable
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= cubi_FraudonLoansHeldforSaleMember