XML 22 R11.htm IDEA: XBRL DOCUMENT
v3.26.1

Historical Loss And LAE Development | 3 Months Ended
--- | ---
Mar. 31, 2026
Historical Loss And L A E Development Disclosure [Abstract] |
Historical Loss And LAE Development | 4. HISTORICAL LOSS AND LAE DEVELOPMENT ​ The following table is a reconciliation of our unpaid losses and settlement expenses (LAE) for the first three months of 2026 and 2025: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Three Months
​ | ​ | Ended March 31,
(in thousands) |  | 2026 |  | 2025
Unpaid losses and LAE at beginning of year | ​ | ​ | ​ | ​ | ​ | ​
Gross | ​ | $ | 2,886,819 | ​ | $ | 2,693,470
Ceded | ​ | ​ | (746,798) | ​ | ​ | (755,425)
Net | ​ | $ | 2,140,021 | ​ | $ | 1,938,045
​ | ​ | ​ | ​ | ​ | ​ | ​
Increase (decrease) in incurred losses and LAE | ​ | ​ | ​ | ​ | ​ | ​
Current accident year | ​ | $ | 228,708 | ​ | $ | 208,243
Prior accident years | ​ | ​ | (35,464) | ​ | ​ | (31,005)
Total incurred | ​ | $ | 193,244 | ​ | $ | 177,238
​ | ​ | ​ | ​ | ​ | ​ | ​
Loss and LAE payments for claims incurred | ​ | ​ | ​ | ​ | ​ | ​
Current accident year | ​ | $ | (10,045) | ​ | $ | (9,827)
Prior accident years | ​ | ​ | (135,794) | ​ | ​ | (115,040)
Total paid | ​ | $ | (145,839) | ​ | $ | (124,867)
​ | ​ | ​ | ​ | ​ | ​ | ​
Net unpaid losses and LAE at March 31, | ​ | $ | 2,187,426 | ​ | $ | 1,990,416
​ | ​ | ​ | ​ | ​ | ​ | ​
Unpaid losses and LAE at March 31, | ​ | ​ | ​ | ​ | ​ | ​
Gross | ​ | $ | 2,927,929 | ​ | $ | 2,743,245
Ceded | ​ | ​ | (740,503) | ​ | ​ | (752,829)
Net | ​ | $ | 2,187,426 | ​ | $ | 1,990,416
​ For the first three months of 2026, incurred losses and LAE included $35 million of favorable development on prior years’ loss reserves, primarily related to accident years 2018, 2019, 2022, 2024 and 2025. Favorable development was driven by commercial property, marine, executive products, professional services and commercial transportation. While personal umbrella experienced adverse development, no products had significant adverse development. ​ For the first three months of 2025, incurred losses and LAE included $31 million of favorable development on prior years’ loss reserves, primarily related to accident years 2019 through 2022 and 2024. Favorable development was driven by marine, surety, commercial property, commercial excess liability, general liability and our mortgage reinsurance program. Personal umbrella and commercial transportation had adverse development related to auto exposures, but no products experienced significant adverse development.

X
- Definition Historical loss and LAE development disclosure. + References No definition available. + Details
Name: | rli_HistoricalLossAndLAEDevelopmentDisclosureAbstract
Namespace Prefix: | rli_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The entire disclosure for liabilities related to future policy benefits and unpaid claims and claim adjustments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480081/944-40-50-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/944-40/tableOfContent + Details
Name: | us-gaap_LiabilityForFuturePolicyBenefitsAndUnpaidClaimsDisclosureTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration