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Mergers and Acquisitions - Calculation of Purchase Price and Resulting Goodwill Relating to ESB Acquisition (Parenthetical) (Detail) (ESB Financial Corporation [Member], USD $)
In Millions, unless otherwise specified
 0 Months Ended
Feb. 10, 2015
ESB Financial Corporation [Member]
  
Business Acquisition [Line Items]  
Equity issuance costs $ 0.1us-gaap_PaymentsOfStockIssuanceCosts
/ us-gaap_BusinessAcquisitionAxis
= wsbc_EsbFinancialCorporationMember