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LOANS HELD FOR SALE - Narrative (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
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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