XML 88 R46.htm IDEA: XBRL DOCUMENT
v3.25.1

DESCRIPTION OF THE BUSINESS - Additional Information (Detail) | Mar. 31, 2025 branch
--- | ---
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Number of branches | 7

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