Regulatory Matters - Additional Information (Detail) - USD ($)	1 Months Ended	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Potential maximum dividends without prior regulatory approval	$ 306,300,000
Average required reserve balance in Federal Reserve Bank	$ 0	$ 0	$ 500,000
Percentage of Risk-weighted assets in bank holding companies in total capital	8	8
Common equity tier 1, minimum value	4.50%	4.50%
Common equity tier 1, well capitalized	6.50%	6.50%
Percentage of Risk-weighted assets in banking subsidiaries	6.00%	6.00%
Percentage of well-capitalized levels of Tier 1 risk-based capital	8.00%	8.00%
Percentage of well-capitalized levels of total risk-based capital	10	10
Provision of the Dodd-Frank	$ 15,000,000,000	$ 15,000,000,000
Percentage of common equity tier 1	7.00%	7.00%
Percentage of tier 1 risk based capital	8.50%	8.50%
Percentage of total risk-based capital	10.50%	10.50%
Junior subordinated debt	$ 132,190,000	$ 132,190,000
Trust preferred securities included in Tier Two capital	$ 130,000,000.0	$ 130,000,000.0
Current Expected Losses Methodology for Allowances [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
CECL on regulatory capital adoption delay period		2 years
CECL on regulatory capital transition period after delay		3 years
CECL on regulatory capital transition period		5 years
Minimum [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Minimum Tier 1 leverage ratio	4	4
Minimum [Member] | Current Expected Losses Methodology for Allowances [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Regulatory capital levels required capital benefits to be well capitalized		0.30%
Maximum [Member] | Current Expected Losses Methodology for Allowances [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Regulatory capital levels required capital benefits to be well capitalized		0.50%
Wesbanco Bank, Inc [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common equity tier 1, well capitalized	6.50%	6.50%
Percentage of well-capitalized levels of Tier 1 leverage capital	5	5
Junior Subordinated Debt [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Junior subordinated debt	$ 132,200,000	$ 132,200,000