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Schedule III - Supplementary Insurance Information | 12 Months Ended
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Dec. 31, 2024
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, 2024
($ in thousands) |  | Deferred policy acquisition costs |  | Reserve for loss and loss expense |  | Unearned premiums |  | Net premiums earned |  | Net investment income 1 |  | Loss and loss expense incurred |  | Amortization of deferred policy acquisition costs |  | Other operating expenses 2 |  | Net premiums written
Standard Commercial Lines Segment |  | $ | 389,992 |  |  | 5,388,205 |  |  | 1,908,949 |  |  | 3,447,556 |  |  | — |  |  | 2,501,615 |  |  | 764,662 |  |  | 326,262 |  |  | 3,632,113 |
Standard Personal Lines Segment |  | 23,374 |  |  | 541,449 |  |  | 433,056 |  |  | 424,917 |  |  | — |  |  | 364,601 |  |  | 46,487 |  |  | 53,314 |  |  | 430,725 |
E&S Lines Segment |  | 65,938 |  |  | 660,147 |  |  | 274,263 |  |  | 503,974 |  |  | — |  |  | 298,268 |  |  | 111,282 |  |  | 42,544 |  |  | 567,163 |
Investments Segment |  | — |  |  | — |  |  | — |  |  | — |  |  | 454,102 |  |  | — |  |  | — |  |  | — |  |  | — |
Total |  | $ | 479,304 |  |  | 6,589,801 |  |  | 2,616,268 |  |  | 4,376,447 |  |  | 454,102 |  |  | 3,164,484 |  |  | 922,431 |  |  | 422,120 |  |  | 4,630,001 |
1 Includes “Net investment income earned” and “Net realized and unrealized investment gains (losses)” on the Consolidated Statements of Income. 2“Other operating expenses” of $422,120 reconciles to the Consolidated Statements of Income as follows:
Other insurance expenses | $ | 453,235 |
Other income | (31,115) |
Total | $ | 422,120 |
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, 2023
($ in thousands) |  | Deferred policy acquisition costs |  | Reserve for loss and loss expense |  | Unearned premiums |  | Net premiums earned |  | Net investment income 1 |  | Loss and loss expense incurred |  | Amortization of deferred policy acquisition costs |  | Other operating expenses 2 |  | 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 Segment |  | 24,759 |  |  | 278,152 |  |  | 399,157 |  |  | 365,213 |  |  | — |  |  | 353,185 |  |  | 36,001 |  |  | 55,290 |  |  | 414,585 |
E&S Lines Segment |  | 49,907 |  |  | 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 |
1 Includes “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 premiums |  | Net premiums earned |  | Net investment income 1 |  | Loss and loss expense incurred |  | Amortization of deferred policy acquisition costs |  | Other operating expenses 2 |  | 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 Segment |  | 17,817 |  |  | 340,302 |  |  | 322,668 |  |  | 299,405 |  |  | — |  |  | 231,113 |  |  | 27,129 |  |  | 48,356 |  |  | 319,059 |
E&S Lines Segment |  | 39,272 |  |  | 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 |
1 Includes “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.

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- Definition The entire disclosure for supplementary insurance information by segment. Includes, but is not limited to, deferred policy acquisition cost; future policy benefit, loss, claim and loss expenses; unearned premium; other policy claim and benefit payable; premium revenue; net investment income; benefit, claim, loss and settlement expenses; amortization of deferred policy acquisition cost; other operating expense; and premium written. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 16 -Paragraph Column J -Footnote 3 -Publisher SEC Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 16 -Paragraph Column G -Footnote 3 -Publisher SEC Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16(Column G)(Footnote 3)) -SubTopic 235 -Topic 944 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477965/944-235-S99-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-16(Column J)(Footnote 3)) -SubTopic 235 -Topic 944 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477965/944-235-S99-1 + Details
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