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Insurance Contracts (Tables) | 9 Months Ended
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Sep. 30, 2025
Insurance [Line Items] |
Schedule of Loss And Loss Expense Reserves And Subrogation Recoverable Table [Table Text Block] |
Premium Receivable, Allowance for Credit Loss [Table Text Block] |
Nine Months Ended September 30, | 2025 |  | 2024
Beginning balance | $ | 142 |  |  | $ | — |
Current period provision | 58 |  |  | 142 |
Write-offs of the allowance | — |  |  | — |
Recoveries of previously written-off amounts | — |  |  | — |
Ending balance | $ | 200 |  |  | $ | 142 |
At September 30, 2025, and December 31, 2024, $9,445 and $5,690 of premiums were past due.
Summary of Loss Reserve Roll-Forward, Net of Subrogation Recoverable and Reinsurance | Below is the loss and loss reserve expense roll-forward, net of subrogation recoverable and reinsurance, for the affected periods:
Nine Months Ended September 30, | 2025 |  | 2024
Beginning gross loss and loss expense reserves | $ | 349,062 |  |  | $ | 197,089 |
Reinsurance recoverable | 270,081 |  |  | 156,301 |
Beginning balance of net loss and loss expense reserves | 78,981 |  |  | 40,788 |
Losses and loss expenses: |  |  |
Current year | 31,577 |  |  | 59,742 |
Prior years | 4,283 |  |  | 3,058 |
Total (1) | 35,860 |  |  | 62,800 |
Loss and loss expenses paid (recovered): |  |  |
Current year | 4,263 |  |  | 9,572 |
Prior years | 27,814 |  |  | 13,585 |
Total | 32,077 |  |  | 23,157 |
Ending net loss and loss expense reserves | 82,764 |  |  | 80,431 |
Reinsurance recoverable (2) | 354,775 |  |  | 242,800 |
Ending gross loss and loss expense reserves | $ | 437,539 |  |  | $ | 323,231 |
(1)Total losses and loss adjustment expense (benefit) is net of $(166,959) and $(72,160) for the nine months ended September 30, 2025 and 2024, respectively, related to ceded reinsurance. (2)Represents reinsurance recoverable on future loss and loss expenses. Additionally, the Balance Sheet line "Reinsurance recoverable on paid and unpaid losses" includes reinsurance recoverables (payables) of $85,687 and $41,225 as of September 30, 2025, and 2024, respectively, related to previously paid loss and loss expenses Prior accident years losses incurred development for the nine months ended September 30, 2025, was primarily driven by increased commercial auto loss experience for programs in run-off and excess liability claims, whereas prior accident years losses incurred development for the nine months ended September 30, 2024, was primarily driven by increased commercial auto loss experience for programs in run-off.
Effects of Reinsurance | The effect of reinsurance on premiums written and earned was as follows:
| Three Months Ended September 30,
| 2025 |  | 2024
| Written |  | Earned |  | Written |  | Earned
Direct | $ | 89,780 |  |  | $ | 83,058 |  |  | $ | 92,776 |  |  | $ | 79,847 |
Assumed | 7,405 |  |  | 8,053 |  |  | 22,378 |  |  | 16,999 |
Ceded | 79,408 |  |  | 74,084 |  |  | 82,400 |  |  | 69,405 |
Net premiums | $ | 17,777 |  |  | $ | 17,027 |  |  | $ | 32,754 |  |  | $ | 27,441 |
| Nine Months Ended September 30,
| 2025 |  | 2024
| Written |  | Earned |  | Written |  | Earned
Direct | $ | 256,820 |  |  | $ | 243,104 |  |  | $ | 262,726 |  |  | $ | 211,820 |
Assumed | 23,527 |  |  | 22,556 |  |  | 60,057 |  |  | 49,804 |
Ceded | 229,360 |  |  | 216,752 |  |  | 231,493 |  |  | 181,550 |
Net premiums | $ | 50,987 |  |  | $ | 48,908 |  |  | $ | 91,290 |  |  | $ | 80,074 |
Reinsurance Recoverable, Credit Quality Indicator | The following table sets forth our five most significant reinsurers by amount of reinsurance recoverable as of September 30, 2025.
Reinsurers |  |  | Rating (1) |  | Reinsurance Recoverable (2) |  | Unsecured Recoverable (3)
General Reinsurance Company |  |  | A++ |  | $ | 148,776 |  |  | $ | 130,515 |
Munich Reinsurance Company |  |  | A+ |  | 49,677 |  |  | 32,540 |
QBE Insurance Corporation |  |  | A |  | 27,255 |  |  | 27,255 |
Guaranty Captive Insurance Company |  |  | NR |  | 21,937 |  |  | — |
Swiss Reinsurance America Corporation |  |  | A+ |  | 17,486 |  |  | 15,890 |
All other reinsurers |  |  |  |  | 175,331 |  |  | 98,083 |
Total recoverables |  |  |  | $ | 440,462 |  |  | $ | 304,283 |
(1)Represents financial strength ratings from AM Best for P&C reinsurers. (2)Represents reinsurance recoverables on paid and unpaid losses. Unsecured amounts from QBE Insurance Corporation are also supported by an unlimited, uncapped indemnity from Enstar Holdings (US). (3)Reinsurance recoverables reduced by ceded premiums payables due to reinsurers, letters of credit, and collateral posted for the benefit of Ambac.

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- Definition Tabular disclosure that provides regarding the balance sheet line items for the liability "Loss and Loss Expense Reserves" and the asset "Subrogation Recoverable". Includes the various components of Unpaid Claims, Accrued Interest on Unpaid Claims, Present Value of Future Expected Claims and Loss Expenses, Present Vlaue of Future Expected Recoveries and the related Unearned Premium Revenue liability. + References No definition available. + Details
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- Definition Tabular disclosure of the effects of reinsurance, for example, but not limited to, disclosure of direct, assumed, and ceded insurance. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479838/944-20-50-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 605 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479032/944-605-50-1 + Details
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- Definition Tabular disclosure of allowance for credit loss on premium receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + Details
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- Definition Tabular disclosure of the activity in the reserve for settling insured claims and expenses incurred in the claims settlement process for the period. The estimated liability includes the amount of money that will be required for future payments of (a) claims that have been reported to the insurer, (b) claims related to insured events that have occurred but that have not been reported to the insurer as of the date the liability is estimated, and (c) claim adjustment expenses. Claim adjustment expenses include costs incurred in the claim settlement process such as legal fees; outside adjuster fees; and costs to record, process, and adjust claims. + 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 + Details
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