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Transactions with Executive Officers, Directors, and Principal Shareholders - Narrative (Details)	12 Months Ended
	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: