Mergers and Acquisitions - Additional Information (Detail) $ / shares in Units, $ in Thousands				3 Months Ended	6 Months Ended
	Feb. 28, 2025 USD ($) $ / shares shares	Feb. 27, 2025 shares	Aug. 01, 2024 shares	Jun. 30, 2025 USD ($) Branch shares	Jun. 30, 2025 USD ($) Branch shares	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($) shares
Business Combination [Line Items]
Number of branches | Branch				73	73
Goodwill				$ 1,600,000	$ 1,600,000		$ 1,100,000
Treasury shares issued | shares				0	0		8,434,229
Premier Financial Corporation [Member]
Business Combination [Line Items]
Date of acquisition	Feb. 28, 2025
Assets excluding goodwill and intangible assets	$ 7,900,000
Loans	5,900,000
Securities	1,200,000
Fair value of Wesbanco shares issued	1,007,845
Merger-related expenses				$ 32,500	$ 53,400
Goodwill	476,175			476,175	476,175	$ 483,397
Core deposit and other intangible assets acquired	158,406
Customer list and other intangible assets acquired	$ 6,900
Percentage of voting interests						30.00%
Acquisition closing stock price | $ / shares	$ 35.07
Amortized cost of non-PCD loans	$ 6,000,000
Interest and credit marks of non-PCD loans	$ 300,000
Number of right to receive shares, converted from outstanding common stock | shares	28,738,104
Number of newly issued shares | shares	28,738,104	20,316,670	7,272,728
Treasury shares issued | shares		8,421,434
Loans held for investment acquired from PFC	$ 5,900,000
Loans held for investment identified as non-PCD	5,700,000
Loans held for investment, identified as PCD	200,000
Premier Financial Corporation [Member] | Community Banking [Member]
Business Combination [Line Items]
Goodwill				$ 476,200	$ 476,200
Core deposit and other intangible assets acquired	$ 151,500
Core Deposits
Business Combination [Line Items]
Intangible assets, amortization period					10 years