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Insurance Contracts - Summary of Loss Reserve Roll-Forward, Net of Subrogation Recoverable and Reinsurance (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]            
Beginning balance of net loss and loss expense reserves     $ 78,981 $ 40,788    
Current Year Claims and Claims Adjustment Expense $ 31,577 $ 59,742        
Prior Year Claims and Claims Adjustment Expense 4,283 3,058        
Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims 35,860 62,800        
Claim and loss expense payments, net of subrogation and reinsurance (4,263) (9,572)        
Claim and loss expense (payments) recoveries, net of subrogation and reinsurance (27,814) (13,585)        
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid 32,077 23,157        
Liability for Unpaid Claims and Claims Adjustment Expense, Net 82,764 80,431 82,764 80,431 $ 78,981 $ 40,788
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments 354,775 242,800 354,775 242,800 270,081 156,301
Policyholder Benefits and Claims Incurred, Ceded     166,959 72,160    
Ceded Loss And Loss Expenses Paid Not Yet Recovered   41,225   41,225    
Liability for Claim and Claim Adjustment Expenses Net of Subrogation recoverables 437,539 $ 323,231 437,539 $ 323,231 349,062 $ 197,089
Liability for Claims and Claims Adjustment Expense 437,539   437,539   $ 349,062  
Segment Reporting, Reconciling Item, Corporate Nonsegment | Other Insurance Contracts            
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]            
Liability for Claims and Claims Adjustment Expense $ 28,999   $ 28,999