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Revenue Recognition - Summary of Revenue Recognition (Parenthetical) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Net Swap Fee and Valuation Income [Member] |  |  |  |
Schedule Of Revenue Recognition [Line Items] |  |  |  |
Gain (loss) on change in fair value of underlying swaps not within the scope of ASC 606 | $ 22.0 | $ (1.7) | $ (1.7) | $ (0.9)

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- Definition Gain​ (loss​) on change​ in fair​ value​ of swap loans​ not​ within​ scope​ of ASC 606. + References No definition available. + Details
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Namespace Prefix: | wsbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Schedule of revenue recognition. + References No definition available. + Details
Name: | wsbc_ScheduleOfRevenueRecognitionLineItems
Namespace Prefix: | wsbc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_ProductOrServiceAxis=wsbc_NetSwapFeeAndValuationIncomeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |