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Retirement Plans
 9 Months Ended
Sep. 30, 2025
Retirement Benefits [Abstract]  
Retirement Plans Retirement Plans
The primary pension plan for our employees is the Retirement Income Plan for Selective Insurance Company of America (the "Pension Plan"). The Pension Plan is closed to new entrants, and its benefits ceased accruing after March 31, 2016. For more information about Selective Insurance Company of America's ("SICA") retirement plans, see Note 15. "Retirement Plans" in Item 8. "Financial Statements and Supplementary Data." of our 2024 Annual Report.

The following tables provide information about the Pension Plan:

Pension Plan
Quarter ended
September 30,		Nine Months ended
September 30,
($ in thousands)2025202420252024
Net Periodic Pension Cost (Benefit):
Interest cost$3,974 3,888 $11,920 11,664 
Expected return on plan assets(5,339)(5,382)(16,017)(16,147)
Amortization of unrecognized net actuarial loss868 955 2,604 2,865 
Total net periodic pension cost (benefit)1
$(497)(539)$(1,493)(1,618)
1The components of net periodic pension cost (benefit) are included within "Loss and loss expense incurred" and "Other insurance expenses" on the Consolidated Statements of Income.

Pension Plan
Nine Months ended September 30
20252024
Weighted-Average Expense Assumptions:
Discount rate5.69 %5.02 %
Effective interest rate for calculation of interest cost5.42 4.91 
Expected return on plan assets6.60 6.40