XML 75 R59.htm IDEA: XBRL DOCUMENT v3.20.4

Description of the Business - Narrative (Detail)	Dec. 31, 2020 Branch
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of branches	12

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