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Loans and the Allowance for Credit Losses - Additional Information (Detail)
 3 Months Ended 12 Months Ended
Mar. 31, 2021
USD ($)
Contract
Loan
Dec. 31, 2020
USD ($)
Contract
Financing Receivable, Recorded Investment [Line Items]    
Net deferred loan income $ 13,300,000 $ 6,200,000
Un-accreted discount on purchased loans from acquisitions $ 35,900,000 39,400,000
Percentage of national unemployment projection 5.80%  
Expected average percentage of national unemployment in future 4.80%  
Calculation period of reversion 1 year  
Reserve on accrued interest related to CARES Act $ 200,000  
Accrued interest receivable for loans 53,500,000  
Accrued interest receivable for loans related to CARES Act 24,900,000  
Aggregate amount of residential real estate, home equity and consumer loans classified as substandard 29,400,000 27,700,000
Internally assigned loan grades to residential real estate, home equity and consumer loans 5,500,000 4,100,000
Unfunded commercial loan commitments $ 28,300,000 $ 28,700,000
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 $ 900,000 900,000
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 $ 200,000,000  
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 / co-borrowers.  
Other real estate owned $ 375,000 504,000
Residential Real Estate [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Other real estate owned 100,000 100,000
Foreclosure proceedings in process on residential real estate loans 4,300,000 4,100,000
PPP Loans [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Net deferred loan income 21,400,000 $ 13,800,000
Commercial and Industrial [Member] | Maximum [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Annual sales of borrowers $ 100,000,000