Subordinated Debt and Junior Subordinated Debt - Schedule of Junior Subordinated Debt by Trusts (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2020
Wesbanco Capital Trust II [Member]
Trust Preferred Securities [Line Items]
Variable rate based on the three-month LIBOR plus	3.15%
Variable rate based on the three-month LIBOR plus, current rate	3.39%
Wesbanco Capital Statutory Trust III [Member]
Trust Preferred Securities [Line Items]
Variable rate based on the three-month LIBOR plus	3.10%
Variable rate based on the three-month LIBOR plus, current rate	3.35%
Wesbanco Capital Trust IV [Member]
Trust Preferred Securities [Line Items]
Variable rate based on the three-month LIBOR plus	2.65%
Variable rate based on the three-month LIBOR plus, current rate	2.88%
Wesbanco Capital Trust V [Member]
Trust Preferred Securities [Line Items]
Variable rate based on the three-month LIBOR plus	2.65%
Variable rate based on the three-month LIBOR plus, current rate	2.88%
Wesbanco Capital Trust VI [Member]
Trust Preferred Securities [Line Items]
Variable rate based on the three-month LIBOR plus	1.77%
Variable rate based on the three-month LIBOR plus, current rate	2.00%
Oak Hill Capital Trust 2 [Member]
Trust Preferred Securities [Line Items]
Variable rate based on the three-month LIBOR plus	2.40%
Variable rate based on the three-month LIBOR plus, current rate	2.62%
Oak Hill Capital Trust 3 [Member]
Trust Preferred Securities [Line Items]
Variable rate based on the three-month LIBOR plus	2.30%
Variable rate based on the three-month LIBOR plus, current rate	2.52%
Oak Hill Capital Trust 4 [Member]
Trust Preferred Securities [Line Items]
Variable rate based on the three-month LIBOR plus	1.60%
Variable rate based on the three-month LIBOR plus, current rate	1.84%
Community Bank Shares Statutory Trust I [Member]
Trust Preferred Securities [Line Items]
Variable rate based on the three-month LIBOR plus	2.65%
Variable rate based on the three-month LIBOR plus, current rate	2.88%
Community Bank Shares Statutory Trust II [Member]
Trust Preferred Securities [Line Items]
Variable rate based on the three-month LIBOR plus	1.70%
Variable rate based on the three-month LIBOR plus, current rate	1.92%
First Federal Statutory Trust II [Member]
Trust Preferred Securities [Line Items]
Variable rate based on the three-month LIBOR plus	1.60%
Variable rate based on the three-month LIBOR plus, current rate	1.82%