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Regulatory Capital - Narrative (Details) | Dec. 31, 2020
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Regulatory Capital [Abstract] |
Maximum buffer, percent of risk weighted assets for 2019 and thereafter | 2.50%

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- Definition Capital Conservation Buffer to Risk Weighted Assets, Year Four and Thereafter + References No definition available. + Details
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Namespace Prefix: | cubi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Regulatory Capital + References No definition available. + Details
Name: | cubi_RegulatoryCapitalAbstract
Namespace Prefix: | cubi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration