Document and Entity Information	6 Months Ended
	Jun. 30, 2012	Jul. 23, 2012
Document and Entity Information [Abstract]
Entity Registrant Name	WESBANCO INC
Entity Central Index Key	0000203596
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2012
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q2
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		26,664,644