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Transactions with Executive Officers, Directors, and Principal Shareholders - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Related Party Transaction [Line Items]      
Percentage of gross revenue 5.00%cubi_BenchmarkPercentageOfGrossRevenuesForRelatedPartyTransactions    
Percentage of aggregate amount of consolidated assets 5.00%cubi_BenchmarkPercentageOfAggregateAssetsForRelatedPartyTransactions    
Amount paid to related party $ 46,900cubi_AmountsPaidToRelatedParties $ 200,000cubi_AmountsPaidToRelatedParties $ 400,000cubi_AmountsPaidToRelatedParties
Percentage of shareholding by director 25.00%cubi_PercentageHoldingOfRelatedPartiesInTheirAffiliatedInterests    
Jastrem Premium Landscapes      
Related Party Transaction [Line Items]      
Amount paid to related party $ 11,300cubi_AmountsPaidToRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cubi_JastremPremiumLandscapesMember		 $ 3,800cubi_AmountsPaidToRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cubi_JastremPremiumLandscapesMember		 $ 6,400cubi_AmountsPaidToRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= cubi_JastremPremiumLandscapesMember
Minimum      
Related Party Transaction [Line Items]      
Percentage of participation in equity 10.00%cubi_PercentageOfParticipationInEquity
/ us-gaap_RangeAxis
= us-gaap_MinimumMember