| Document And Entity Information | Nov. 22, 2019 |
| Cover [Abstract] | |
| Entity Registrant Name | Wesbanco, Inc. |
| Amendment Description | As previously disclosed in the Current Report on Form 8-K filed by Wesbanco, Inc., a West Virginia corporation (“Wesbanco”) on November 22, 2019 (the “Initial Form 8-K”), on November 22, 2019, Wesbanco completed its previously announced merger (the “Merger”) with Old Line Bancshares, Inc., a Maryland corporation (“Old Line Bancshares”), pursuant to the Agreement and Plan of Merger, dated as of July 23, 2019, by and among Wesbanco, Wesbanco Bank, Inc., a West Virginia corporation and a wholly-owned subsidiary of Wesbanco, Old Line Bancshares and Old Line Bank, a Maryland-chartered trust company exercising the powers of a commercial bank and a wholly-owned subsidiary of Old Line Bancshares. This Current Report on Form 8-K/A amends the Initial Form 8-K to include the historical financial statements of Old Line Bancshares and the pro forma financial information required to be filed under Item 9.01 of Form 8-K. The disclosure included in the Initial Form 8-K otherwise remains unchanged. |
| Amendment Flag | true |
| Entity Central Index Key | 0000203596 |
| Document Type | 8-K/A |
| Document Period End Date | Nov. 22, 2019 |
| Entity Incorporation State Country Code | WV |
| Entity File Number | 000-08467 |
| 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Security 12b Title | Common Stock $2.0833 Par Value |
| Trading Symbol | WSBC |
| Security Exchange Name | NASDAQ |
