| 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 |
