Description of the Business - Additional Information (Detail)	12 Months Ended
Dec. 31, 2010 Bank	Mar. 31, 2015 Branch
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of banks acquired	2us-gaap_NumberOfBusinessesAcquired
Number of branches		14cubi_NumberOfBranches

The number of businesses acquired by the entity during the period.

No definition available.

Name:	us-gaap_NumberOfBusinessesAcquired
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration