Wesbanco Bank Community Development Corporation - Summary of New Market Tax Credit Carry Forward (Parenthetical) (Detail) $ in Millions	Dec. 31, 2016 USD ($)
WBCDC [Member]
Schedule Of Subsidiary Financial Statements Table [Line Items]
Qualified equity investment amount for which tax credit expired	$ 44.0

Qualified Equity Investment Amount For Which Tax Credit Expired

No definition available.

Name:	wsbc_QualifiedEquityInvestmentAmountForWhichTaxCreditExpired
Namespace Prefix:	wsbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant