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Employee Benefit Plans - Fair Values of the Wesbanco's Pension Plan Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]    
Total defined benefit pension plan assets $ 202,783 $ 185,300
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total defined benefit pension plan assets 129,182 143,323
Significant Other Observable Inputs (Level 2) [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total defined benefit pension plan assets 73,601 41,977
Registered Investment Companies [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total defined benefit pension plan assets 54,737 58,101
Registered Investment Companies [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total defined benefit pension plan assets 54,737 58,101
Equity Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total defined benefit pension plan assets 74,445 85,222
Equity Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total defined benefit pension plan assets 74,445 85,222
Corporate Debt Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total defined benefit pension plan assets 57,404 21,170
Corporate Debt Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total defined benefit pension plan assets 57,404 21,170
Municipal Obligations [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total defined benefit pension plan assets 2,124 2,382
Municipal Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total defined benefit pension plan assets 2,124 2,382
Residential Mortgage-Backed Securities and Collateralized Mortgage Obligations of Government Sponsored Entities and Agencies [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total defined benefit pension plan assets 14,073 18,425
Residential Mortgage-Backed Securities and Collateralized Mortgage Obligations of Government Sponsored Entities and Agencies [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Total defined benefit pension plan assets $ 14,073 $ 18,425