Wesbanco Bank Community Development Corporation - Schedule of Condensed Balance Sheet (Parenthetical) (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule Of Subsidiary Financial Statements Table [Line Items]
Allowance for loan losses	$ 43,674	$ 41,710	$ 44,654	$ 47,368
WBCDC [Member]
Schedule Of Subsidiary Financial Statements Table [Line Items]
Allowance for loan losses	$ 249