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Revenue Recognition - Summary of Revenue Recognition (Parenthetical) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenue Recognition [Abstract]
Gain (loss) on change in fair value of other real estate owned and other assets not within scope of ASC 606	$ 3.8	$ (0.1)	$ 0.3

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- References

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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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