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Share-Based Compensation Plans - Summary of Non-Vested Options (Detail) (Non-Vested Options, USD $)
12 Months Ended
Dec. 31, 2014
Non-Vested Options
 
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]  
Number of shares, Outstanding, Beginning balance 3,036,056,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares
/ us-gaap_AwardTypeAxis
= cubi_NonVestedOptionsMember
Number of shares, Granted 130,978,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= cubi_NonVestedOptionsMember
Number of shares, Forfeited (12,650,000)us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsForfeitedNumberOfShares
/ us-gaap_AwardTypeAxis
= cubi_NonVestedOptionsMember
Number of shares, Outstanding, Ending balance 3,154,384,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares
/ us-gaap_AwardTypeAxis
= cubi_NonVestedOptionsMember
Weighted-average exercise price, Outstanding, Beginning balance $ 12.42cubi_ShareBasedCompensationArrangementByShareBasedPaymentsAwardOptionsNonvestedWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= cubi_NonVestedOptionsMember
Weighted-average exercise price, Granted $ 17.78us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= cubi_NonVestedOptionsMember
Weighted-average exercise price, Forfeited $ 17.72us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= cubi_NonVestedOptionsMember
Weighted-average exercise price, Outstanding, Ending balance $ 12.59cubi_ShareBasedCompensationArrangementByShareBasedPaymentsAwardOptionsNonvestedWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= cubi_NonVestedOptionsMember