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Bank Premises and Equipment - Narrative (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Abstract]
Depreciation, occupancy and amortization of leasehold improvement	$ 2.8	$ 2.5	$ 2.2
Rent expense	$ 5.2	$ 4.7	$ 3.8

X

- Definition

Depreciation, Occupancy and Amortization of Leasehold Improvement

+ References

No definition available.

+ Details

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

X

- Definition

Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717

+ Details

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Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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