Financing Receivable, before Allowance for Credit Loss, Payment Protection Program, CARES Act

No definition available.

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

- Definition

Loans receivable mortgage warehouse, carrying amount of loans made to mortgage companies under master lending agreements, usually in the form of a revolving line of credit used by the borrower to originate and purchase and sell mortgage loans.

+ References

No definition available.

+ Details

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

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

- Definition

Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446

+ Details

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amortized cost excluding accrued interest, after allowance for credit loss, of financing receivable. Excludes net investment in lease.

+ References

+ Details

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

- Definition

Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919230-210447

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 3B
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL120267963-210447

+ Details

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

- Definition

Amount of unamortized loan commitment, origination, and other costs (fees) and purchase premium (discount) on financing receivable recognized as adjustment to yield. Excludes financing receivable covered under loss sharing agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI https://asc.fasb.org/extlink&oid=123577603&loc=d3e5074-111524

Reference 2: http://www.xbrl.org/2003/role/recommendedDisclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 20
-Section 50
-Paragraph 3
-URI https://asc.fasb.org/extlink&oid=84159169&loc=d3e10152-111534

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 20
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=6378536&loc=d3e10092-111533

+ Details

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

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=cubi_MultifamilyPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=cubi_ConstructionPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=cubi_ManufacturedHousingPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=cubi_InstallmentLoansPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ClassOfFinancingReceivableTypeOfBorrowerAxis=us-gaap_CommercialBorrowerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=cubi_CommercialandIndustrialMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=cubi_CommercialRealEstateOwnerOccupiedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialRealEstatePortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_FinanceLeasesPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ClassOfFinancingReceivableTypeOfBorrowerAxis=us-gaap_ConsumerBorrowerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Loans and Leases Receivable and Allowance for Credit Losses on Loans and Leases - Schedule of Loans and Leases Receivable (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, mortgage warehouse, at fair value	$ 1,874,603		$ 2,284,325
Loans receivable, PPP	1,570,160		3,250,008
Loans and leases receivable	12,212,995		9,018,298
Allowance for credit losses on loans and leases	(156,530)	$ (145,847)	(137,804)	$ (125,436)	$ (128,736)	$ (144,176)
Total loans and leases receivable, net of allowance for credit losses on loans and leases	15,501,228		14,414,827
Deferred (fees) costs and unamortized (discounts) premiums, net	(12,100)		(52,000)
Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	2,008,784		1,486,308
Allowance for credit losses on loans and leases	(9,765)	(7,437)	(4,477)	(5,028)	(8,026)	(12,620)
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	195,687		198,981
Allowance for credit losses on loans and leases	(1,179)	(939)	(692)	(2,643)	(4,103)	(5,871)
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	457,768		334,730
Allowance for credit losses on loans and leases	(5,578)	(4,685)	(2,383)	(2,299)	(3,209)	(3,977)
Manufactured housing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	48,570		52,861
Allowance for credit losses on loans and leases	(4,080)	(4,342)	(4,278)	(4,372)	(4,800)	(5,190)
Installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	1,901,070		1,744,475
Allowance for credit losses on loans and leases	(111,222)	$ (107,883)	(103,849)	$ (91,129)	$ (83,539)	$ (75,315)
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	9,805,587		6,886,232
Commercial \| Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	5,737,670		3,424,783
Commercial \| Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	2,008,784		1,486,308
Commercial \| Commercial real estate owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	710,577		654,922
Commercial \| Commercial real estate non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	1,152,869		1,121,238
Commercial \| Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	195,687		198,981
Commercial \| Direct Finance Equipment Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	149,200		146,500
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	2,407,408		2,132,066
Consumer \| Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	457,768		334,730
Consumer \| Manufactured housing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	48,570		52,861
Consumer \| Installment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases receivable	$ 1,901,070		$ 1,744,475