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Schedule III - Supplementary Insurance Information
 12 Months Ended
Dec. 31, 2023
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Abstract]  
Schedule III- Supplementary Insurance Information
SCHEDULE III
 
SELECTIVE INSURANCE GROUP, INC. AND CONSOLIDATED SUBSIDIARIES
SUPPLEMENTARY INSURANCE INFORMATION
Year ended December 31, 2023
($ in thousands)Deferred
policy
acquisition costs		Reserve
for loss
and loss expense		Unearned premiumsNet
premiums earned
Net
investment income1
Loss
and loss
expense incurred		Amortization
of deferred
policy
acquisition costs
Other
operating expenses2
Net
premiums written
Standard Commercial Lines Segment$350,198 4,494,965 1,722,706 3,071,784 — 1,919,204 674,374 320,900 3,281,319 
Standard Personal Lines Segment24,759 278,152 399,157 365,213 — 353,185 36,001 55,290 414,585 
E&S Lines Segment49,907 563,794 208,793 390,609 — 211,896 85,807 38,150 438,628 
Investments Segment— — — — 385,098 — — — — 
Total$424,864 5,336,911 2,330,656 3,827,606 385,098 2,484,285 796,182 414,340 4,134,532 
1Includes “Net investment income earned” and “Net realized and unrealized investment gains (losses)” on the Consolidated Statements of Income.
2“Other operating expenses” of $414,340 reconciles to the Consolidated Statements of Income as follows:
Other insurance expenses$433,742 
Other income(19,402)
Total$414,340 
See accompanying Report of Independent Registered Public Accounting Firm in Item 8. "Financial Statements and Supplementary Data." of this Form 10-K.
 Year ended December 31, 2022
($ in thousands)Deferred
policy
acquisition costs		Reserve
for loss
and loss expense		Unearned premiumsNet
premiums earned
Net
investment income1
Loss
and loss
expense incurred		Amortization
of deferred
policy
acquisition costs
Other
operating expenses2
Net
premiums written
Standard Commercial Lines Segment$311,535 4,275,002 1,511,447 2,739,819 — 1,683,988 605,845 306,290 2,901,984 
Standard Personal Lines Segment17,817 340,302 322,668 299,405 — 231,113 27,129 48,356 319,059 
E&S Lines Segment39,272 529,517 158,666 334,156 — 196,677 72,848 34,332 352,547 
Investments Segment— — — — 173,347 — — — — 
Total$368,624 5,144,821 1,992,781 3,373,380 173,347 2,111,778 705,822 388,978 3,573,590 
1Includes “Net investment income earned” and “Net realized and unrealized investment gains (losses)” on the Consolidated Statements of Income.
2“Other operating expenses” of $388,978 reconciles to the Consolidated Statements of Income as follows:
Other insurance expenses$400,313 
Other income(11,335)
Total$388,978 
See accompanying Report of Independent Registered Public Accounting Firm in Item 8. "Financial Statements and Supplementary Data." of this Form 10-K.

Year ended December 31, 2021
($ in thousands)Deferred
policy
acquisition costs		Reserve
for loss and loss expense		Unearned premiumsNet
premiums earned
Net
investment income1
Loss
and loss
expense incurred		Amortization
of deferred
policy
acquisition costs
Other
operating expenses2
Net
premiums written
Standard Commercial Lines Segment$279,850 3,832,151 1,346,809 2,443,885 — 1,426,768 539,606 278,915 2,593,018 
Standard Personal Lines Segment12,911 270,066 317,276 293,559 — 212,116 25,918 51,559 292,265 
E&S Lines Segment34,154 478,686 139,122 279,809 — 175,100 60,945 27,734 304,430 
Investments Segment— — — — 344,188 — — — — 
Total$326,915 4,580,903 1,803,207 3,017,253 344,188 1,813,984 626,469 358,208 3,189,713 
1Includes “Net investment income earned” and “Net realized and unrealized investment gains (losses)” on the Consolidated Statements of Income.
2“Other operating expenses” of $358,208 reconciles to the Consolidated Statements of Income as follows:
Other insurance expenses$375,931 
Other income(17,723)
Total$358,208 
See accompanying Report of Independent Registered Public Accounting Firm in Item 8. "Financial Statements and Supplementary Data." of this Form 10-K.