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Loans Held for Sale - Narrative (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Receivables Held-for-sale [Abstract]
Loans held-for-sale (including nonperforming loans)	$ 0.6	$ 18.5

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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