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Cover
May 06, 2024
Document Information [Line Items]  
Document Type 8-K
Amendment Flag false
Document Period End Date May 06, 2024
Entity Registrant Name SELECTIVE INSURANCE GROUP, INC.
Entity File Number 001-33067
Entity Central Index Key 0000230557
Entity Tax Identification Number 22-2168890
Entity Incorporation, State or Country Code NJ
Entity Address, Address Line One 40 Wantage Avenue
Entity Address, City or Town Branchville
Entity Address, Postal Zip Code 07890
Entity Address, State or Province NJ
City Area Code 973
Local Phone Number 948-3000
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company false
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
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