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Guarantees - Additional Information (Detail) (USD $)
Mar. 31, 2015
Guarantor Obligations [Line Items]  
Guarantor obligations, standby letters of credit $ 190,400,000us-gaap_GuaranteeObligationsCurrentCarryingValue
Liability related to standby letters of credit 623,000vly_LiabilityRelatedToStandbyLettersOfCredit
Secured [Member]  
Guarantor Obligations [Line Items]  
Guarantor obligations, standby letters of credit $ 130,600,000us-gaap_GuaranteeObligationsCurrentCarryingValue
/ us-gaap_GuaranteeObligationsByNatureAxis
= vly_SecuredMember
Percent of secured letters of credit 68.60%vly_PercentOfSecuredLettersOfCredit
/ us-gaap_GuaranteeObligationsByNatureAxis
= vly_SecuredMember