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Shareholders' Equity - Narrative (Detail) - series | Mar. 31, 2024 | Dec. 31, 2023
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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