Disclosures about Fair Value of Financial Instruments - Estimated Fair Values of Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and Cash Equivalents, at Carrying Value	$ 371,023	$ 233,068	$ 186,016	$ 73,570
Cash and cash equivalents, Fair Value	371,023	233,068
Investment securities, available for sale, Carrying Amount	416,685us-gaap_AvailableForSaleSecurities	497,573us-gaap_AvailableForSaleSecurities
Loans held for sale	1,435,459us-gaap_LoansReceivableHeldForSaleNet	747,593us-gaap_LoansReceivableHeldForSaleNet
Loans held for sale, Fair Value	1,436,460	747,593
Loans receivable, net of allowance for loan losses	4,281,241	2,441,080
Loans receivable, net, Fair Value	4,285,537	2,444,900
FHLB and Federal Reserve Bank stock, Carrying Amount	82,002	42,424
FHLB and Federal Reserve Bank stock, Fair Value	82,002	42,424
Accrued interest receivable, Carrying Amount	15,205us-gaap_InterestReceivable	8,362us-gaap_InterestReceivable
Accrued interest receivable, Fair Value	15,205	8,362
FDIC loss sharing receivable, Carrying Amount	2,320us-gaap_FDICIndemnificationAsset	10,046us-gaap_FDICIndemnificationAsset	12,343us-gaap_FDICIndemnificationAsset	13,077us-gaap_FDICIndemnificationAsset
FDIC loss sharing receivable, Fair Value	2,320	10,046
Derivative Asset	7,552us-gaap_DerivativeAssets	3,763us-gaap_DerivativeAssets
Deposits, Carrying Amount	4,532,538us-gaap_Deposits	2,959,922us-gaap_Deposits
Deposits, Fair Value	4,540,507us-gaap_DepositsFairValueDisclosure	2,919,935us-gaap_DepositsFairValueDisclosure
Federal funds purchased	0us-gaap_FederalFundsPurchased	13,000us-gaap_FederalFundsPurchased
Federal Funds Purchased, Fair Value		13,000
Assets secured for advances	1,618,000us-gaap_FederalHomeLoanBankAdvances	706,500us-gaap_FederalHomeLoanBankAdvances
Advances, Fair Value Disclosure	1,619,858us-gaap_AdvancesFairValueDisclosure	708,025us-gaap_AdvancesFairValueDisclosure
Other borrowings	88,250us-gaap_OtherBorrowings	63,250us-gaap_OtherBorrowings
Other Borrowings, Fair Value	92,069cubi_BorrowingsFairValueDisclosure	64,768cubi_BorrowingsFairValueDisclosure
Subordinated debt	110,000us-gaap_SubordinatedDebt	2,000us-gaap_SubordinatedDebt
Subordinated debt fair value	111,925	2,000
Derivative liabilities	9,716us-gaap_DerivativeLiabilities	3,537us-gaap_DerivativeLiabilities
Accrued interest payable, Carrying Amount	2,599	1,675
Accrued interest payable, Fair Value	2,599	1,675
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents, Fair Value	371,023
Investment securities, available for sale, Carrying Amount	24,270	20,714
Loans held for sale, Fair Value	0	0
Loans receivable, net, Fair Value	0	0
FHLB and Federal Reserve Bank stock, Fair Value	0	0
Accrued interest receivable, Fair Value	0	0
FDIC loss sharing receivable, Fair Value	0	0
Derivative Asset	0	0
Deposits, Fair Value	546,436	478,103
Federal Funds Purchased, Fair Value		13,000
Advances, Fair Value Disclosure	1,298,000	596,500
Other Borrowings, Fair Value	66,944	64,768
Subordinated debt fair value	0	0
Derivative liabilities	0	0
Accrued interest payable, Fair Value	0	0
Significant Other Observable Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents, Fair Value	0	0
Investment securities, available for sale, Carrying Amount	392,415	476,859
Loans held for sale, Fair Value	1,335,668	747,593
Loans receivable, net, Fair Value	0	0
FHLB and Federal Reserve Bank stock, Fair Value	82,002	42,424
Accrued interest receivable, Fair Value	15,205	8,362
FDIC loss sharing receivable, Fair Value	0	0
Derivative Asset	7,509	3,523
Deposits, Fair Value	3,994,071	2,441,832
Federal Funds Purchased, Fair Value		0
Advances, Fair Value Disclosure	321,858	111,525
Other Borrowings, Fair Value	25,125	0
Subordinated debt fair value	111,925	2,000
Derivative liabilities	9,716	3,537
Accrued interest payable, Fair Value	2,599	1,675
Significant Unobservable Inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents, Fair Value	0	0
Investment securities, available for sale, Carrying Amount	0	0
Loans held for sale, Fair Value	100,792	0
Loans receivable, net, Fair Value	4,285,537	2,444,900
FHLB and Federal Reserve Bank stock, Fair Value	0	0
Accrued interest receivable, Fair Value	0	0
FDIC loss sharing receivable, Fair Value	2,320	10,046
Derivative Asset	43	240
Deposits, Fair Value	0	0
Federal Funds Purchased, Fair Value		0
Advances, Fair Value Disclosure	0	0
Other Borrowings, Fair Value	0	0
Subordinated debt fair value	0	0
Derivative liabilities	0	0
Accrued interest payable, Fair Value	$ 0	$ 0

Borrowings Fair Value Disclosure

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Fdic Indemnification Asset Fair Value Disclosure

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Federal Home Loan Bank Stock And Federal Reserve Bank Stock Fair Value

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Fair value portion of accrued expenses.

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Fair value of Federal Home Loan Bank (FHLBank) advances carried under the fair value option.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others.

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Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Carrying amount of receivable assets originating from the indemnification agreement with the Federal Deposit Insurance Corporation (FDIC), in which the FDIC is to partially cover losses.

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Amount of short term borrowing where a bank borrows, at the federal funds rate, from another bank.

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Fair value portion of short term borrowing where a bank borrows, at the federal funds rate, from another bank.

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Amount of Federal Home Loan Bank (FHLBank) advances to member financial institutions.

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Amount of Federal Home Loan Bank (FHLB) and Federal Reserve Bank stock.

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Amount of interest payable on debt, including, but not limited to, trade payables.

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Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable.

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Carrying amount of interest earned but not received (also called accrued interest or accrued interest receivable) and carrying amounts of assets not separately disclosed.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums over and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes loans and leases covered under loss sharing agreements.

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Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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Amount classified as loans attributable to disposal group held for sale or disposed of. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities.

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The carrying amount as of the balance sheet date for the aggregate of other miscellaneous borrowings owed by the reporting entity.

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Fair value of all derivative liabilities not designated as a hedging instrument.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of subordinated debt (with initial maturities beyond one year or beyond the operating cycle if longer). Subordinated debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets.

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