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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2024
Jan. 31, 2025
Jun. 30, 2024
Document and Entity Information [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2024    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-33067    
Entity Registrant Name SELECTIVE INSURANCE GROUP, INC.    
Entity Incorporation, State or Country Code NJ    
Entity Tax Identification Number 22-2168890    
Entity Address, Address Line One 40 Wantage Avenue    
Entity Address, City or Town Branchville    
Entity Address, State or Province NJ    
Entity Address, Postal Zip Code 07890    
City Area Code (973)    
Local Phone Number 948-3000    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 5,667,194,813
Entity Common Stock, Shares Outstanding   60,805,019  
Documents Incorporated by Reference
Portions of the registrant’s definitive Proxy Statement for the 2025 Annual Meeting of Stockholders to be held on April 30, 2025, are incorporated by reference into Part III of this report.
    
Amendment Flag false    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Entity Central Index Key 0000230557    
Depositary Shares      
Document Information [Line Items]      
Title of 12(b) Security Depositary Shares, each representing a 1/1,000th interest in a share of 4.60% Non-Cumulative Preferred Stock, Series B, without par value    
Trading Symbol SIGIP    
Security Exchange Name NASDAQ    
Common Stock      
Document Information [Line Items]      
Title of 12(b) Security Common Stock, par value $2 per share    
Trading Symbol SIGI    
Security Exchange Name NASDAQ