Federal Home Loan Bank Borrowings - Additional Information (Detail) (USD $)	Jun. 30, 2013	Dec. 31, 2012
Federal Home Loan Bank Advances Branch Of F H L B Bank [Line Items]
Borrowings	$ 60,344,000	$ 111,200,000
Weighted-average rate, Total	2.72%	3.04%
FHLB stock owned by WesBanco pledged as collateral on these advances	13,200,000	21,300,000
Remaining maximum borrowing capacity	1,400,000,000	1,300,000,000
Outstanding in FHLB convertible advances subject to call or conversion	$ 6,000,000