Comprehensive Income - Components of Accumulated Other Comprehensive Income (Parenthetical) (Detail)	6 Months Ended
Jun. 30, 2014	Jun. 30, 2013
Statement Of Income And Comprehensive Income [Abstract]
Percentage of Federal and State income tax rate	36.50%	36.50%

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