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Regulatory Matters - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Potential maximum dividends without prior regulatory approval $ 28,500,000wsbc_BankDividendRestrictedAmount  
Average required reserve balance in Federal Reserve Bank 5,000,000wsbc_AverageNonInterestBearingReserveBalanceRequiredInFederalReserveBank 5,000,000wsbc_AverageNonInterestBearingReserveBalanceRequiredInFederalReserveBank
Percentage of Risk-weighted assets in bank holding companies in total capital 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets  
Percentage of Risk-weighted assets in banking subsidiaries 4.00%wsbc_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssetsForBankingSubsidiaries  
Percentage of well-capitalized levels of Tier 1 risk-based capital 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets  
Percentage of well-capitalized levels of total risk-based capital 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets  
Minimum tier 1 leverage ratio 9.88%us-gaap_TierOneLeverageCapitalToAverageAssets 9.27%us-gaap_TierOneLeverageCapitalToAverageAssets
Percentage of well-capitalized levels of Tier 1 leverage capital     
Junior Subordinated Debt 106,176,000us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust 106,137,000us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust
Provision of the Dodd-Frank 15,000,000,000wsbc_AssetsThresholdProvisionOfDoddFrankAct  
Trust Preferred Securities 102,980,000wsbc_TrustPreferredSecuritiesOutstanding  
Minimum [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Minimum tier 1 leverage ratio 3.00%us-gaap_TierOneLeverageCapitalToAverageAssets
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
WesBanco Bank Inc [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Percentage of Risk-weighted assets in bank holding companies in total capital 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= wsbc_WesBancoBankIncMember
 
Percentage of well-capitalized levels of Tier 1 risk-based capital 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= wsbc_WesBancoBankIncMember
 
Percentage of well-capitalized levels of total risk-based capital 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= wsbc_WesBancoBankIncMember
 
Minimum tier 1 leverage ratio 8.63%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= wsbc_WesBancoBankIncMember
8.58%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= wsbc_WesBancoBankIncMember
Percentage of well-capitalized levels of Tier 1 leverage capital 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
= wsbc_WesBancoBankIncMember
 
Junior Subordinated Debt [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Junior Subordinated Debt $ 106,200,000us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_JuniorSubordinatedDebtMember