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Revenue Recognition - Summary of Revenue Recognition (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Revenue Recognition [Abstract] |  |  |
(Losses) gain on change in fair value of other real estate owned and other assets not within scope of ASC 606 | $ (1.0) | $ 3.8 | $ (0.1)

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

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- Definition Gain (loss) on change in fair value of other real estate owned and other assets not within scope of ASC 606. + References No definition available. + Details
Name: | wsbc_GainLossOnChangeInFairValueOfOtherRealEstateOwnedAndOtherAssetsNotWithinScopeOfAsc606
Namespace Prefix: | wsbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration