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Allowance for Credit Losses - Summary of Allowance for Credit Losses (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Receivables [Abstract]      
Allowance for non-covered loans $ 102,153vly_AllowanceForNonCoveredLoans $ 106,547vly_AllowanceForNonCoveredLoans  
Allowance for covered loans 200vly_AllowanceForCoveredLoans 7,070vly_AllowanceForCoveredLoans  
Total allowance for loan losses 102,353us-gaap_FinancingReceivableAllowanceForCreditLosses 113,617us-gaap_FinancingReceivableAllowanceForCreditLosses 130,200us-gaap_FinancingReceivableAllowanceForCreditLosses
Allowance for unfunded letters of credit 1,934vly_AllowanceForUnfundedLettersOfCredit 3,495vly_AllowanceForUnfundedLettersOfCredit  
Total allowance for credit losses $ 104,287vly_AllowanceForCreditLosses $ 117,112vly_AllowanceForCreditLosses