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LOANS HELD FOR SALE - Narrative (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Receivable, Held-for-Sale [Abstract]
Loans held for sale (including nonperforming loans)	$ 0.4	$ 2.8

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- Definition

Loans Held-for-Sale (Including Nonperforming Loans)

+ References

No definition available.

+ Details

Name:	cubi_LoansHeldForSaleIncludingNonperformingLoans
Namespace Prefix:	cubi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

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