Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482665/350-30-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 985
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481283/985-20-50-2

Mergers and Acquisitions - Additional Information (Detail) $ / shares in Units, $ in Thousands				3 Months Ended	9 Months Ended
	Feb. 28, 2025 USD ($) $ / shares shares	Feb. 27, 2025 shares	Aug. 01, 2024 shares	Sep. 30, 2025 USD ($) Branch shares	Sep. 30, 2025 USD ($) Branch shares	Jun. 30, 2025 USD ($)	Mar. 31, 2025	Dec. 31, 2024 USD ($) 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				$ 4,000	$ 57,400
Goodwill	481,422			481,422	481,422	$ 476,175
Core deposit and other intangible assets acquired	152,488
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				$ 481,400	$ 481,400
Core deposit and other intangible assets acquired	$ 145,600
Core Deposits
Business Combination [Line Items]
Intangible assets, amortization period					10 years