Revenue Recognition - Summary of Revenue Recognition (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2023	Mar. 31, 2022
Revenue Recognition [Abstract]
Gain (losses) on change in fair value of other real estate owned and other assets not within scope of ASC 606	$ 0.0	$ 1.2

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