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FINANCIAL INSTRUMENTS WITH OFF-BALANCE SHEET RISK - Schedule of Financial Instruments Outstanding Contract Amounts Represent Credit Risk (Detail) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
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Commitments and Contingencies Disclosure [Abstract] |  |
Commitments to fund loans and leases | $ 145,252 | $ 165,881
Unfunded commitments to fund mortgage finance loans | 1,581,033 | 1,562,593
Unfunded commitments under lines of credit and credit cards | 3,812,979 | 3,825,727
Letters of credit | 34,114 | 31,832
Other unused and unfunded commitments | $ 25,810 | $ 28,904

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- Definition Commitments to fund loans and leases. + References No definition available. + Details
Name: | cubi_CommitmentsToFundLoansAndLeases
Namespace Prefix: | cubi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Unfunded commitments to fund mortgage warehouse loans. + References No definition available. + Details
Name: | cubi_UnfundedCommitmentsToFundMortgageWarehouseLoans
Namespace Prefix: | cubi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Unfunded commitments under lines of credit. + References No definition available. + Details
Name: | cubi_UnfundedCommitmentsUnderLinesOfCredit
Namespace Prefix: | cubi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
Name: | us-gaap_OtherCommitment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant