Loans and the Allowance for Credit Losses - Additional Information (Detail)	6 Months Ended		12 Months Ended
	Jun. 30, 2022 USD ($) Contract Loan	Jun. 30, 2021 Contract	Dec. 31, 2021 USD ($) Contract	Mar. 31, 2022
Financing Receivable, Recorded Investment [Line Items]
Net deferred loan fee income (costs)	$ 8,900,000		$ 3,300,000
Un-accreted discount on purchased loans from acquisitions	$ 21,500,000		25,900,000
Percentage of national unemployment projection				4.00%
Expected average percentage of national unemployment in future	4.40%
Reserve on accrued interest related to CARES Act	$ 100,000
Accrued interest receivable for loans	45,300,000
Accrued interest receivable for loans related to CARES Act	19,600,000
Aggregate amount of residential real estate, home equity and consumer loans classified as substandard	25,300,000		30,200,000
Internally assigned loan grades to residential real estate, home equity and consumer loans	4,900,000		7,400,000
Unfunded commercial loan commitments	$ 25,300,000		$ 21,700,000
Number of restructured contracts greater than $1 million | Contract	0		0
Threshold for TDR	$ 1,000,000.0		$ 1,000,000.0
Accruing and non accrual TDR permitted interest-only payment period	6 months
Unfunded commitments to debtors for nonperforming loans	$ 300,000		100,000
Number Of restructured contracts defaulted | Contract	0	0
Number of loans modified | Loan	3,553
Total loan amount modified CARES Act	$ 2,200,000,000
Loan amount remaining in deferral period CARES Act	$ 31,200,000
Description of deferred payments to customers impacted by the COVID-19 pandemic	Wesbanco originally offered three to six months of deferred payments to commercial and retail customers impacted by the COVID-19 pandemic depending on the type of loan and the industry for commercial loans. In the fourth quarter of 2020, Wesbanco offered up to an additional twelve months of deferred payments to certain commercial loan customers, predominantly in the hospitality industry, based on specific criteria related to the borrower, the underlying property and the potential for guarantors or co-borrowers.
Other real estate owned	$ 0
Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Foreclosure proceedings in process on residential real estate loans	4,100,000		4,000,000.0
Foreclosure proceedings temporarily suspended on real estate loans	0		800,000
PPP Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Net deferred loan fee income (costs)	1,100,000		$ 6,100,000
Commercial and Industrial [Member] | Maximum [Member]
Financing Receivable, Recorded Investment [Line Items]
Annual sales of borrowers	$ 100,000,000