Wesbanco Bank Community Development Corporation - Additional Information (Detail) - WBCDC [Member] - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Schedule Of Subsidiary Financial Statements Table [Line Items]
New Markets Tax Credits	$ 60,000,000
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	$ 21,500,000
Investment limit for credit allowance	60,000,000
Amount eligible to receive as tax credit	1,900,000
Provision for income tax	1,800,000	$ 1,900,000	$ 2,300,000
Tax credit carry forward	$ 1,200,000
Minimum percentage of QEI proceeds utilized	85.00%