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Shareholders' Equity - Narrative (Detail) - series	Mar. 31, 2024	Dec. 31, 2023
Equity [Abstract]
Preferred stock, number of series outstanding	2	2

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- Definition

Preferred Stock, Number of Series Outstanding

+ References

No definition available.

+ Details

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Namespace Prefix:	cubi_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

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- References

No definition available.

+ Details

Name:	us-gaap_EquityAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration