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Regulatory Matters - Summary of Risk-Based Capital Amounts and Ratios (Detail) - USD ($)
Dec. 31, 2021
Dec. 31, 2020
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Percentage of risk-weighted assets in bank holding companies in Tier 1 4.00%  
Tier 1 capital to risk-weighted assets, minimum value 6.00%  
Total capital to risk-weighted assets, minimum value 8.00%  
Common equity tier 1, minimum value 4.50%  
Tier 1 leverage, well capitalized 5.00%  
Tier 1 capital to risk-weighted assets, well capitalized 8.00%  
Total capital to risk-weighted assets, well capitalized 10.00%  
Common equity tier 1, well capitalized 6.50%  
Tier 1 leverage, amount $ 1,586,165,000 $ 1,617,413,000
Tier 1 capital to risk-weighted assets, amount 1,586,165,000 1,617,413,000
Total capital to risk-weighted assets, amount 1,795,661,000 1,931,414,000
Common equity tier 1, amount $ 1,441,681,000 $ 1,472,929,000
Tier 1 leverage, ratio 10.02% 10.51%
Tier 1 capital to risk-weighted assets, ratio 14.05% 14.72%
Total capital to risk-weighted assets, ratio 15.91% 17.58%
Common equity tier 1, ratio 12.77% 13.40%
Wesbanco Bank, Inc [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Percentage of risk-weighted assets in bank holding companies in Tier 1 4.00%  
Tier 1 capital to risk-weighted assets, minimum value 6.00%  
Total capital to risk-weighted assets, minimum value 8.00%  
Common equity tier 1, minimum value 4.50%  
Tier 1 leverage, well capitalized 5.00%  
Tier 1 capital to risk-weighted assets, well capitalized 8.00%  
Total capital to risk-weighted assets, well capitalized 10.00%  
Common equity tier 1, well capitalized 6.50%  
Tier 1 leverage, amount $ 1,529,227,000 $ 1,536,609,000
Tier 1 capital to risk-weighted assets, amount 1,529,227,000 1,536,609,000
Total capital to risk-weighted assets, amount 1,608,723,000 1,685,610,000
Common equity tier 1, amount $ 1,529,227,000 $ 1,536,609,000
Tier 1 leverage, ratio 9.68% 10.00%
Tier 1 capital to risk-weighted assets, ratio 13.60% 14.04%
Total capital to risk-weighted assets, ratio 14.31% 15.40%
Common equity tier 1, ratio 13.60% 14.04%
Minimum [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Tier 1 leverage, amount $ 633,089,000 $ 615,814,000
Tier 1 capital to risk-weighted assets, amount 677,190,000 659,372,000
Total capital to risk-weighted assets, amount 902,920,000 879,162,000
Common equity tier 1, amount 507,893,000 494,529,000
Minimum [Member] | Wesbanco Bank, Inc [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Tier 1 leverage, amount 631,920,000 614,792,000
Tier 1 capital to risk-weighted assets, amount 674,622,000 656,732,000
Total capital to risk-weighted assets, amount 899,496,000 875,643,000
Common equity tier 1, amount $ 505,967,000 $ 492,549,000