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Mergers and Acquisitions - Summary of Purchase Price of Acquisition and Resulting Goodwill (Detail) - USD ($) $ in Thousands				12 Months Ended
	Nov. 22, 2019	Aug. 20, 2018	Apr. 05, 2018	Dec. 31, 2019
Old Line [Member]
Purchase Price:
Fair value of Wesbanco shares issued	$ 493,936
Cash consideration for outstanding shares	16
Total purchase price	493,952
Fair value of:
Tangible assets acquired	2,919,459
Core deposit and other intangible assets acquired	33,591
Liabilities assumed	(2,722,913)
Net cash received in the acquisition	60,041
Fair value of net assets acquired	290,178
Goodwill recognized	$ 203,774			$ 203,800
Farmers Capital Bank Corporation [Member]
Purchase Price:
Fair value of Wesbanco shares issued		$ 391,267
Cash consideration for outstanding shares		37,634
Total purchase price		428,901
Fair value of:
Tangible assets acquired		1,370,245
Core deposit and other intangible assets acquired		39,992
Liabilities assumed		(1,434,779)
Net cash received in the acquisition		230,139
Fair value of net assets acquired		205,597
Goodwill recognized		$ 223,304
First Sentry Bancshares, Inc. [Member]
Purchase Price:
Fair value of Wesbanco shares issued			$ 107,347
Cash consideration for outstanding shares			975
Total purchase price			108,322
Fair value of:
Tangible assets acquired			609,593
Core deposit and other intangible assets acquired			8,078
Liabilities assumed			(664,172)
Net cash received in the acquisition			87,124
Fair value of net assets acquired			40,623
Goodwill recognized			$ 67,699