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Fair Value Measurement of Assets and Liabilities - Carrying Amounts and Estimated Fair Values of Financial Instruments (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Interest bearing deposits with banks $ 367,838us-gaap_InterestBearingDepositsInBanks $ 134,915us-gaap_InterestBearingDepositsInBanks
Investment securities held to maturity 1,815,976us-gaap_HeldToMaturitySecuritiesFairValue 1,711,427us-gaap_HeldToMaturitySecuritiesFairValue
Accrued interest receivable 57,333us-gaap_AccruedInvestmentIncomeReceivable 53,964us-gaap_AccruedInvestmentIncomeReceivable
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Deposits with stated maturities 2,742,468us-gaap_TimeDeposits 2,179,269us-gaap_TimeDeposits
Carrying Amount [Member]    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Investment securities held to maturity 1,778,316us-gaap_HeldToMaturitySecuritiesFairValue
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Carrying Amount [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Cash and due from banks 462,569us-gaap_CashAndCashEquivalentsFairValueDisclosure
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Interest bearing deposits with banks 367,838us-gaap_InterestBearingDepositsInBanks
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Accrued interest receivable 57,333us-gaap_AccruedInvestmentIncomeReceivable
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Federal Reserve Bank and Federal Home Loan Bank stock (1) 133,117us-gaap_InvestmentInFederalHomeLoanBankStockFairValueDisclosure
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Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Deposits without stated maturities 11,291,648vly_DepositsWithoutStatedMaturitiesFairValueDisclosure
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Short-term borrowings 146,781vly_ShortTermBorrowingsFairValueDisclosure
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Accrued interest payable (2) 15,526vly_AccruedInterestPayableFairValueDisclosure
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Carrying Amount [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S. Treasury securities [Member]    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Investment securities held to maturity 139,121us-gaap_HeldToMaturitySecuritiesFairValue
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Carrying Amount [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Deposits with stated maturities 2,742,468us-gaap_TimeDeposits
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Long-term borrowings 2,526,408vly_LongTermBorrowingsFairValueDisclosure
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Carrying Amount [Member] | Significant Other Observable Inputs (Level 2) [Member] | U.S. government agency securities [Member]    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Investment securities held to maturity 14,081us-gaap_HeldToMaturitySecuritiesFairValue
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Carrying Amount [Member] | Significant Other Observable Inputs (Level 2) [Member] | Obligations of states and political subdivisions [Member]    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Investment securities held to maturity 500,018us-gaap_HeldToMaturitySecuritiesFairValue
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Carrying Amount [Member] | Significant Other Observable Inputs (Level 2) [Member] | Residential mortgage-backed securities [Member]    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Investment securities held to maturity 986,992us-gaap_HeldToMaturitySecuritiesFairValue
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Carrying Amount [Member] | Significant Other Observable Inputs (Level 2) [Member] | Trust preferred securities [Member]    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Investment securities held to maturity 98,456us-gaap_HeldToMaturitySecuritiesFairValue
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Carrying Amount [Member] | Significant Other Observable Inputs (Level 2) [Member] | Corporate and other debt securities [Member]    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Investment securities held to maturity 39,648us-gaap_HeldToMaturitySecuritiesFairValue
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Carrying Amount [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Net loans 13,371,560us-gaap_LoansReceivableFairValueDisclosure
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Fair Value [Member]    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Investment securities held to maturity 1,815,976us-gaap_HeldToMaturitySecuritiesFairValue
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Fair Value [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Cash and due from banks 462,569us-gaap_CashAndCashEquivalentsFairValueDisclosure
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Federal Reserve Bank and Federal Home Loan Bank stock (1) 133,117us-gaap_InvestmentInFederalHomeLoanBankStockFairValueDisclosure
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Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Deposits without stated maturities 11,291,648vly_DepositsWithoutStatedMaturitiesFairValueDisclosure
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Fair Value [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S. Treasury securities [Member]    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Investment securities held to maturity 151,300us-gaap_HeldToMaturitySecuritiesFairValue
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Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
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Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
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Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
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Fair Value [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]    
Net loans $ 13,085,830us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		 $ 11,294,348us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
[1] Included in other assets.
[2] Included in accrued expenses and other liabilities.