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Commitments and Contingent Liabilities - Commitments to Extend Credit, Guarantees and Various Letters of Credit Outstanding (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]    
Lines of credit $ 1,032,235wsbc_LinesOfCredit $ 984,352wsbc_LinesOfCredit
Loans approved but not closed 295,702wsbc_LoansApprovedButNotClosed 116,757wsbc_LoansApprovedButNotClosed
Overdraft limits 110,389wsbc_OverdraftLimits 95,965wsbc_OverdraftLimits
Letters of credit 26,910us-gaap_LettersOfCreditOutstandingAmount 23,362us-gaap_LettersOfCreditOutstandingAmount
Contingent obligations to purchase loans funded by other entities $ 8,457wsbc_ContingentObligationsToPurchaseLoansFundedByOtherEntities $ 8,312wsbc_ContingentObligationsToPurchaseLoansFundedByOtherEntities