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Loans and the Allowance for Credit Losses - Recorded Investment in Non-Accrual Loans and TDRs (Parenthetical) (Detail) | Mar. 31, 2021 USD ($) Borrower | Dec. 31, 2020 USD ($) Borrower
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Receivables [Abstract] |  |
Number of borrowers with loan balance greater than one million | Borrower | 1 | 1
Borrowers with large amount of loans outstanding, minimum amount of loans per borrower | $ 1,000,000.0 | $ 1,000,000.0
Borrowers with large amount of loans outstanding, net | $ 2,100,000 | $ 2,100,000

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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- Definition Large amount of nonaccrual loans, outstanding, minimum loan amount per borrower. + References No definition available. + Details
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Namespace Prefix: | wsbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Large amount of nonaccrual loans, outstanding, net loan amount of all borrowers. + References No definition available. + Details
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Namespace Prefix: | wsbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Number of borrowers with nonaccrual Loan advances outstanding greater than one million U.S. dollars. + References No definition available. + Details
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Namespace Prefix: | wsbc_
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Period Type: | instant