XML 45 R33.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Description of the Business - Additional Information (Detail) | Sep. 30, 2018 Branch
--- | ---
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Number of branches (branch) | 13

X
- Definition Number of branches. + References No definition available. + Details
Name: | cubi_NumberOfBranches
Namespace Prefix: | cubi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration