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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2020
Feb. 17, 2021
Jun. 30, 2020
Document Information [Line Items]      
Document Type 10-K/A    
Amendment Flag true    
Amendment Description This Amendment No. 1 on Form 10-K/A (this “Amendment”) is being filed by Wesbanco, Inc. (the “Company”) to amend the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2020, initially filed on February 26, 2021 (the “Original Annual Report”) to include the signature of Ernst & Young LLP, the Company’s independent registered public accounting firm, in two separate places where such signatures were inadvertently omitted in the Original Annual Report. The signatures were timely provided by Ernst & Young LLP and received by the Company at the time of filing the Original Annual Report. This Amendment does not change any previously reported financial results or otherwise amend the Original Annual Report as previously filed, except as noted immediately above. Furthermore, this Amendment does not update or otherwise amend the Original Annual Report as previously filed for changes in events, estimates or other developments subsequent to the date of the filing of the Original Annual Report on February 26, 2021.    
Document Period End Date Dec. 31, 2020    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
Entity Registrant Name WESBANCO, INC.    
Entity Central Index Key 0000203596    
Entity Current Reporting Status Yes    
Current Fiscal Year End Date --12-31    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Interactive Data Current Yes    
Entity Common Stock, Shares Outstanding   67,258,727  
Entity Shell Company false    
ICFR Auditor Attestation Flag true    
Entity File Number 000-08467    
Entity Incorporation, State or Country Code WV    
Entity Tax Identification Number 55-0571723    
Entity Address, Address Line One 1 Bank Plaza    
Entity Address, City or Town Wheeling    
Entity Address, State or Province WV    
Entity Address, Postal Zip Code 26003    
City Area Code 304    
Local Phone Number 234-9000    
Document Annual Report true    
Document Transition Report false    
Entity Public Float     $ 1,299,795,869
Entity Voluntary Filers No    
Entity Well-known Seasoned Issuer Yes    
Documents Incorporated by Reference

DOCUMENTS INCORPORATED BY REFERENCE

Certain specifically designated portions of Wesbanco, Inc.’s definitive proxy statement which will be filed by April 30, 2021 for its Annual Meeting of Shareholders (the “Proxy Statement”) to be held in 2021 are incorporated by reference into Part III of this Form 10-K.

    
Common Stock      
Document Information [Line Items]      
Trading Symbol WSBC    
Title of 12(b) Security Common Stock $2.0833 Par Value    
Security Exchange Name NASDAQ    
Depositary Shares      
Document Information [Line Items]      
Trading Symbol WSBCP    
Title of 12(b) Security Depositary Shares (each representing 1/40th interest in a share of 6.75% Fixed-Rate Reset Non-Cumulative Perpetual Preferred Stock, Series A)    
Security Exchange Name NASDAQ