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Comprehensive Income/(Loss) - Components of Accumulated Other Comprehensive Income (Parenthetical) (Detail) | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Statement Of Income And Comprehensive Income [Abstract] |  |
Percentage of Federal and State income tax rate | 24.00% | 24.00%

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- References No definition available. + Details
Name: | us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Income tax expense benefit combined federal and state income tax rate. + References No definition available. + Details
Name: | wsbc_IncomeTaxExpenseBenefitCombinedFederalAndStateIncomeTaxRate
Namespace Prefix: | wsbc_
Data Type: | num:percentItemType
Balance Type: | na
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