Wesbanco Bank Community Development Corporation - Additional Information (Detail) - WBCDC [Member] - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Schedule Of Subsidiary Financial Statements Table [Line Items]
New Markets Tax Credits	$ 125,000,000.0
New Markets Tax Credits invested	85,000,000.0
New Markets Tax Credits not invested	$ 40,000,000.0
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	$ 24,700,000
Investment limit for credit allowance	85,000,000.0
Amount eligible to receive as tax credit	8,500,000
Amount received as tax credit	15,600,000	$ 15,600,000
Investment limit for credit allowance	40,000,000.0	40,000,000.0
Provision for income tax	1,600,000	700,000	$ 1,000,000.0
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
New Markets Tax Credits not invested	$ 25,000,000	$ 15,000,000