Revenue Recognition - Summary of Revenue Recognition (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Revenue Recognition [Abstract]
Gain (losses) on change in fair value of other real estate owned and other assets not within scope of ASC 606	$ 1.5	$ 0.4	$ (1.0)	$ 4.2

Gain (loss) on change in fair value of other real estate owned and other assets not within scope of ASC 606.

No definition available.

Name:	wsbc_GainLossOnChangeInFairValueOfOtherRealEstateOwnedAndOtherAssetsNotWithinScopeOfASC606
Namespace Prefix:	wsbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration