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Regulatory and Capital Requirements - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Schedule of Capitalization, Equity [Line Items]    
Common equity Tier 1 capital to risk-weighted assets ratio 4.50%vly_CommonEquityTierOneCapitalToRiskWeightedAssetsBaselRequirement  
Common equity Tier 1 capital conservation buffer 2.50%vly_TierOneCapitalConservationBufferToRiskWeightedAssetsRequiredUnderRegulatory  
Ratio of Tier 1 capital to risk-weighted assets 9.70%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets 9.70%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
Tier one leverage capital to be well capitalized, minimum leverage ratio 4.00%vly_MinimumLeverageTierOneCapitalRatioToBeConsideredWellCapitalized  
Percent of trust preferred securities disallowed from Tier 1 capital treatment 75.00%vly_TrustPreferredSecuritiesPercentageOfTierOneCapital  
Trust preferred securities [Member]    
Schedule of Capitalization, Equity [Line Items]    
Tier one capital (44.0)vly_TrustPreferredSecuritiesIncludedInTierOneCapital
/ us-gaap_StatementClassOfStockAxis
= us-gaap_OtherDebtSecuritiesMember
 
Minimum [Member]    
Schedule of Capitalization, Equity [Line Items]    
Ratio of Tier 1 capital to risk-weighted assets 4.00%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Maximum [Member]    
Schedule of Capitalization, Equity [Line Items]    
Ratio of Tier 1 capital to risk-weighted assets 6.00%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
Valley National Bank [Member]    
Schedule of Capitalization, Equity [Line Items]    
Tier one risk-based capital to be well capitalized under prompt corrective action provision, ratio 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= vly_ValleyNationalBankMember
6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= vly_ValleyNationalBankMember
Risk-based capital to be well capitalized under prompt corrective action provision, ratio 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= vly_ValleyNationalBankMember
10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= vly_ValleyNationalBankMember
Tier one leverage capital to be well capitalized under prompt corrective action provision, ratio 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
= vly_ValleyNationalBankMember
5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
= vly_ValleyNationalBankMember
Ratio of Tier 1 capital to risk-weighted assets 10.20%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= vly_ValleyNationalBankMember
10.50%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= vly_ValleyNationalBankMember