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Leases - Lessor Narrative (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Minimum
Lessor, Lease, Description [Line Items]
Lessor, lease, term of contract (years)	24 months
Maximum
Lessor, Lease, Description [Line Items]
Lessor, lease, term of contract (years)	120 months
COVID-19 | Finance Leases
Lessor, Lease, Description [Line Items]
Book value	$ 28.1	$ 30.4
COVID-19 | Operating Leases
Lessor, Lease, Description [Line Items]
Book value	$ 8.1	$ 15.2

X

- Definition

Lessor, Book Value of Leases With Payment Deferments

+ References

No definition available.

+ Details

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Namespace Prefix:	cubi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Term of lessor's direct financing lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 30
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=124258985&loc=SL77919359-209981

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	instant

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

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Balance Type:	na
Period Type:	duration

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- Details

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- Details

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- Details

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X

- Details

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X

- Details

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Namespace Prefix:
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Period Type: