Wesbanco Bank Community Development Corporation - Additional Information (Detail) - WBCDC [Member] - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Schedule Of Subsidiary Financial Statements Table [Line Items]
New Markets Tax Credits	$ 125,000,000.0
New Markets Tax Credits invested	100,000,000.0
New Markets Tax Credits not invested	$ 25,000,000.0
Lower limit of poverty rate tracts	20.00%
Percentage income of median family	80.00%
Percentage of credit provided to the investor	39.00%
Period of credit allowance	7 years
Percentage of total amount investor receives as credit	5.00%
Percentage of total amount investor receives as credit for the remaining four years	6.00%
Amount received as tax credit	$ 26,700,000
Investment limit for credit allowance	100,000,000.0
Amount eligible to receive as tax credit	12,300,000
Amount received as tax credit		$ 9,800,000
Investment limit for credit allowance		25,000,000.0
Provision for income tax	2,000,000.0	$ 1,600,000	$ 700,000
Tax credit carry forward	$ 0
Minimum percentage of QEI proceeds utilized	85.00%
NMTC [Member]
Schedule Of Subsidiary Financial Statements Table [Line Items]
New Markets Tax Credits invested	$ 0