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Loans and the Allowance for Credit Losses - Summary of Commercial Loans by Risk Grade (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Summary of commercial loans by risk grade    
Commercial loans $ 2,906,565us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial $ 2,583,870us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
Pass [Member]    
Summary of commercial loans by risk grade    
Commercial loans 2,813,611us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 2,502,731us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Criticized - Compromised [Member]    
Summary of commercial loans by risk grade    
Commercial loans 40,659us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
/ us-gaap_InternalCreditAssessmentAxis
= wsbc_CriticizedCompromisedMember		 34,288us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
/ us-gaap_InternalCreditAssessmentAxis
= wsbc_CriticizedCompromisedMember
Classified - Substandard [Member]    
Summary of commercial loans by risk grade    
Commercial loans 52,295us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
/ us-gaap_InternalCreditAssessmentAxis
= wsbc_ClassifiedSubstandardMember		 46,851us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
/ us-gaap_InternalCreditAssessmentAxis
= wsbc_ClassifiedSubstandardMember
Commercial Real Estate - Land and Construction [Member]    
Summary of commercial loans by risk grade    
Commercial loans 288,075us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wsbc_CommercialRealEstateLandAndConstructionMember		 262,643us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wsbc_CommercialRealEstateLandAndConstructionMember
Commercial Real Estate - Land and Construction [Member] | Pass [Member]    
Summary of commercial loans by risk grade    
Commercial loans 281,730us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wsbc_CommercialRealEstateLandAndConstructionMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 257,218us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wsbc_CommercialRealEstateLandAndConstructionMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Commercial Real Estate - Land and Construction [Member] | Criticized - Compromised [Member]    
Summary of commercial loans by risk grade    
Commercial loans 3,653us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wsbc_CommercialRealEstateLandAndConstructionMember
/ us-gaap_InternalCreditAssessmentAxis
= wsbc_CriticizedCompromisedMember		 3,645us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wsbc_CommercialRealEstateLandAndConstructionMember
/ us-gaap_InternalCreditAssessmentAxis
= wsbc_CriticizedCompromisedMember
Commercial Real Estate - Land and Construction [Member] | Classified - Substandard [Member]    
Summary of commercial loans by risk grade    
Commercial loans 2,692us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wsbc_CommercialRealEstateLandAndConstructionMember
/ us-gaap_InternalCreditAssessmentAxis
= wsbc_ClassifiedSubstandardMember		 1,780us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wsbc_CommercialRealEstateLandAndConstructionMember
/ us-gaap_InternalCreditAssessmentAxis
= wsbc_ClassifiedSubstandardMember
Commercial Real Estate - Improved Property [Member]    
Summary of commercial loans by risk grade    
Commercial loans 1,908,869us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember		 1,682,817us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember
Commercial Real Estate - Improved Property [Member] | Pass [Member]    
Summary of commercial loans by risk grade    
Commercial loans 1,848,655us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 1,627,771us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Commercial Real Estate - Improved Property [Member] | Criticized - Compromised [Member]    
Summary of commercial loans by risk grade    
Commercial loans 18,049us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= wsbc_CriticizedCompromisedMember		 17,873us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= wsbc_CriticizedCompromisedMember
Commercial Real Estate - Improved Property [Member] | Classified - Substandard [Member]    
Summary of commercial loans by risk grade    
Commercial loans 42,165us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= wsbc_ClassifiedSubstandardMember		 37,173us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstateOtherReceivableMember
/ us-gaap_InternalCreditAssessmentAxis
= wsbc_ClassifiedSubstandardMember
Commercial and Industrial [Member]    
Summary of commercial loans by risk grade    
Commercial loans 709,621us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wsbc_CommercialAndIndustrialMember		 638,410us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wsbc_CommercialAndIndustrialMember
Commercial and Industrial [Member] | Pass [Member]    
Summary of commercial loans by risk grade    
Commercial loans 683,226us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wsbc_CommercialAndIndustrialMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 617,742us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wsbc_CommercialAndIndustrialMember
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Commercial and Industrial [Member] | Criticized - Compromised [Member]    
Summary of commercial loans by risk grade    
Commercial loans 18,957us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wsbc_CommercialAndIndustrialMember
/ us-gaap_InternalCreditAssessmentAxis
= wsbc_CriticizedCompromisedMember		 12,770us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wsbc_CommercialAndIndustrialMember
/ us-gaap_InternalCreditAssessmentAxis
= wsbc_CriticizedCompromisedMember
Commercial and Industrial [Member] | Classified - Substandard [Member]    
Summary of commercial loans by risk grade    
Commercial loans $ 7,438us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wsbc_CommercialAndIndustrialMember
/ us-gaap_InternalCreditAssessmentAxis
= wsbc_ClassifiedSubstandardMember		 $ 7,898us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= wsbc_CommercialAndIndustrialMember
/ us-gaap_InternalCreditAssessmentAxis
= wsbc_ClassifiedSubstandardMember