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Business Segments - Additional Information (Detail) $ in Billions	9 Months Ended
	Sep. 30, 2025 USD ($) Segment	Sep. 30, 2024 USD ($)
Segment Reporting Information [Line Items]
Operating segments | Segment	2
Maximum percentage of total segment revenue	10.00%
Segment Reporting, CODM, Profit (Loss) Measure, How Used, Description	The CODM uses net income as the reported measure of segment profit or loss in making business decisions regarding reinvestment into the Company’s segments, using profits for acquisitions and/or paying dividends to shareholders. In addition, net income is used to monitor budget versus actual results, to perform competitive analysis by benchmarking to peers and as a factor to establish compensation for certain employees. Wesbanco does not have any material intra-entity sales or transfers.
Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration]	President and Chief Executive Officer [Member]
Trust and Investment Services [Member]
Segment Reporting Information [Line Items]
Market value of trust assets | $	$ 7.7	$ 6.1

X

- Definition

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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- Definition

Indicates title and position of individual or name of group identified as chief operating decision maker (CODM) for segment reporting.

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Description of how chief operating decision maker (CODM) uses reported segment profit (loss) measure to assess performance and allocate resource.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Market value of cash and securities managed.

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- Definition

Maximum percentage of total segment revenue.

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