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Revenue Recognition - Summary of Revenue Recognition (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	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

Name:	wsbc_GainLossOnChangeInFairValueOfSwapLoansNotWithinScopeOfASC606
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: