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Transactions with Executive Officers, Directors, and Principal Shareholders - Narrative (Details) | 12 Months Ended
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Dec. 31, 2021
Related Party Transaction [Line Items] |
Percentage of gross revenue | 5.00%
Minimum |
Related Party Transaction [Line Items] |
Percentage of participation in equity | 10.00%

X
- Definition Benchmark percentage of gross revenues for related party transactions. + References No definition available. + Details
Name: | cubi_BenchmarkPercentageOfGrossRevenuesForRelatedPartyTransactions
Namespace Prefix: | cubi_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of participation in equity. + References No definition available. + Details
Name: | cubi_PercentageOfParticipationInEquity
Namespace Prefix: | cubi_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |