Subordinated Debt and Junior Subordinated Debt - Schedule of Junior Subordinated Debt by Trusts (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($)
Trust Preferred Securities [Line Items]
Trust Preferred Securities	$ 133,286
Common Securities	4,273
Junior Subordinated Debt	137,559
WesBanco Capital Trust II [Member]
Trust Preferred Securities [Line Items]
Trust Preferred Securities	13,000
Common Securities	410
Junior Subordinated Debt	$ 13,410
Stated Maturity Date	Jun. 30, 2033
Optional Redemption Date	Jun. 30, 2008
WesBanco Capital Statutory Trust III [Member]
Trust Preferred Securities [Line Items]
Trust Preferred Securities	$ 17,000
Common Securities	526
Junior Subordinated Debt	$ 17,526
Stated Maturity Date	Jun. 26, 2033
Optional Redemption Date	Jun. 26, 2008
WesBanco Capital Trust IV [Member]
Trust Preferred Securities [Line Items]
Trust Preferred Securities	$ 20,000
Common Securities	619
Junior Subordinated Debt	$ 20,619
Stated Maturity Date	Jun. 17, 2034
Optional Redemption Date	Jun. 17, 2009
WesBanco Capital Trust V [Member]
Trust Preferred Securities [Line Items]
Trust Preferred Securities	$ 20,000
Common Securities	619
Junior Subordinated Debt	$ 20,619
Stated Maturity Date	Jun. 17, 2034
Optional Redemption Date	Jun. 17, 2009
WesBanco Capital Trust VI [Member]
Trust Preferred Securities [Line Items]
Trust Preferred Securities	$ 15,000
Common Securities	464
Junior Subordinated Debt	$ 15,464
Stated Maturity Date	Mar. 17, 2035
Optional Redemption Date	Mar. 17, 2010
Oak Hill Capital Trust 2 [Member]
Trust Preferred Securities [Line Items]
Trust Preferred Securities	$ 5,000
Common Securities	155
Junior Subordinated Debt	$ 5,155
Stated Maturity Date	Oct. 18, 2034
Optional Redemption Date	Oct. 18, 2009
Oak Hill Capital Trust 3 [Member]
Trust Preferred Securities [Line Items]
Trust Preferred Securities	$ 8,000
Common Securities	248
Junior Subordinated Debt	$ 8,248
Stated Maturity Date	Oct. 18, 2034
Optional Redemption Date	Oct. 18, 2009
Oak Hill Capital Trust 4 [Member]
Trust Preferred Securities [Line Items]
Trust Preferred Securities	$ 5,000
Common Securities	155
Junior Subordinated Debt	$ 5,155
Stated Maturity Date	Jun. 30, 2035
Optional Redemption Date	Jun. 30, 2015
Community Bank Shares Statutory Trust I [Member]
Trust Preferred Securities [Line Items]
Trust Preferred Securities	$ 5,905
Common Securities	217
Junior Subordinated Debt	$ 6,122
Stated Maturity Date	Jun. 17, 2034
Optional Redemption Date	Jun. 17, 2014
Community Bank Shares Statutory Trust II [Member]
Trust Preferred Securities [Line Items]
Trust Preferred Securities	$ 7,901
Common Securities	310
Junior Subordinated Debt	$ 8,211
Stated Maturity Date	Jun. 15, 2036
Optional Redemption Date	Jun. 15, 2016
First Federal Statutory Trust II [Member]
Trust Preferred Securities [Line Items]
Trust Preferred Securities	$ 8,145
Common Securities	310
Junior Subordinated Debt	$ 8,455
Stated Maturity Date	Mar. 22, 2037
Optional Redemption Date	Mar. 15, 2017
First Federal Statutory Trust III [Member]
Trust Preferred Securities [Line Items]
Trust Preferred Securities	$ 8,335
Common Securities	240
Junior Subordinated Debt	$ 8,575
Stated Maturity Date	Jun. 24, 2038
Optional Redemption Date	Jun. 24, 2018