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Related Party Transactions (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Related Party Transaction [Line Items] |  |  |  |
Ceded written premiums | $ 68,643 | $ 49,581 | $ 179,710 | $ 121,639
Related Party |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Ceded written premiums | 8,300 | 5,200 | $ 20,200 | 12,500
Related Party | BIHL |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Limited liability company or limited partnership, members or limited partners, ownership interest |  |  | 0.20% |
Related Party | Ceding Fees |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, amounts of transaction | $ 2,400 | 1,600 | $ 6,200 | 4,100
Related Party | AmFam |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Quota share agreement, percentage | 100.00% |  | 100.00% |
Related Party | BIHL |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Capital contribution from parent, accumulated contributions |  |  | $ 316,300 |
Capital contribution from parent, contributed amount | $ 0 | 22,300 | 4,500 | 53,600
Related Party | AmFam |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Ceded written premiums | $ 8,300 | $ 5,200 | $ 20,200 | $ 12,500

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- Definition Amount of written premiums ceded to other entities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 944 -SubTopic 605 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479032/944-605-50-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 944 -SubTopic 605 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479032/944-605-50-1 + Details
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- Definition Percentage investment held by members or limited partners of limited liability company (LLC) or limited partnership (LP). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482987/272-10-50-3 + Details
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