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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	Dec. 31, 2020	Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments to fund loans and leases	$ 262,153	$ 261,902
Unfunded commitments to fund mortgage warehouse loans	1,933,067	1,378,364
Unfunded commitments under lines of credit and credit cards	1,009,031	1,065,474
Letters of credit	27,166	48,856
Other unused commitments	$ 1,842	$ 2,736

X

- 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

X

- 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

X

- 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

X

- References

No definition available.

+ Details

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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

X

- 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