Accumulated Other Comprehensive Income - Components of Accumulated Other Comprehensive Income (Parenthetical) (Detail)	6 Months Ended
Jun. 30, 2013	Jun. 30, 2012
Equity [Abstract]
Percentage of Federal and State income tax rate	37.00%	37.00%

Income Tax Expense Benefit Combined Federal And State Income Tax Rate

No definition available.

Name:	wsbc_IncomeTaxExpenseBenefitCombinedFederalAndStateIncomeTaxRate
Namespace Prefix:	wsbc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration