Revenue Recognition - Summary of Revenue Recognition (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 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	$ (0.7)	$ (0.0)	$ (1.7)	$ 0.8

Gain (loss) on change in fair value of swap loans not within scope of ASC 606.

No definition available.

Name:	wsbc_GainLossOnChangeInFairValueOfSwapLoansNotWithinScopeOfASC606
Namespace Prefix:	wsbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration