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Employee Benefit Plans - Fair Values of the Wesbanco's Pension Plan Assets (Parenthetical) (Detail) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Compensation Related Costs [Abstract]
Net assets available for benefits	$ 204.8	$ 186.3

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- References

No definition available.

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- Definition

Defined Benefit Plan Net Assets Available For Benefits.

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No definition available.

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Namespace Prefix:	wsbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant