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Deposits - Narrative (Detail) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Banking and Thrift [Abstract]
Time deposits greater than $250,000	$ 500.0	$ 800.0
Brokered money market deposits	556.5	654.8
Brokered certificates of deposit	800.2	504.3
Demand deposit overdrafts reclassified as loans	$ 3.4	$ 2.0

X

- Definition

Amount of brokered money market accounts.

+ References

No definition available.

+ Details

Name:	cubi_BrokeredMoneyMarketDeposits
Namespace Prefix:	cubi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Certificates of deposit brokered.

+ References

No definition available.

+ Details

Name:	cubi_CertificatesOfDepositBrokered
Namespace Prefix:	cubi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Time Deposits, Greater than $250,000

+ References

No definition available.

+ Details

Name:	cubi_TimeDepositsGreaterthan250000
Namespace Prefix:	cubi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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

X

- Definition

Amount of deposits held by the entity that have been reclassified as loan balances receivable, for example, but not limited to, overdrafts receivable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 405
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=50488274&loc=d3e64164-112818

+ Details

Name:	us-gaap_DepositLiabilitiesReclassifiedAsLoansReceivable1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant