Subordinated Debt and Junior Subordinated Debt - Schedule of Junior Subordinated Debt by Trusts (Parenthetical) (Detail)	12 Months Ended
Dec. 31, 2016
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	4.15%
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	4.10%
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	3.64%
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	3.64%
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	2.76%
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	3.28%
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	3.18%
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	2.60%
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	3.64%
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	2.66%
First Federal Statutory Trust II [Member]
Trust Preferred Securities [Line Items]
Variable rate based on the three-month LIBOR plus	1.60%
Fixed interest rate	6.69%
First Federal Statutory Trust III [Member]
Trust Preferred Securities [Line Items]
Fixed interest rate	8.00%
Debt callable year	Jun. 24, 2018

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

No definition available.

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

+ Details

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

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- Definition

Debt instrument callable date.

+ References

No definition available.

+ Details

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- Definition

Trust preferred securities.

+ References

No definition available.

+ Details

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- Details

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