v3.26.3
Reserve for Losses and Loss Adjustment Expenses - Schedule of Reconciliation of The Beginning And Ending Reserve Balances (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]        
Gross reserves for losses and loss adjustment expenses, beginning of year     $ 1,129,936 $ 756,859
Reinsurance recoverable on unpaid losses, beginning of year     381,697 246,915
Net reserves for unpaid losses and loss adjustment expenses, beginning of year     748,239 509,944
Net incurred losses and loss adjustment expenses related to:        
Current accident year     287,831 234,926
Prior accident years     1,644 2,009
Liability for unpaid claims and claims adjustment expense, incurred claims, total $ 101,048 $ 84,608 289,475 236,935
Net paid losses and loss adjustment expenses related to:        
Current accident year     3,554 2,663
Prior accident years     100,672 56,838
Liability for unpaid claims and claims adjustment expense, claims paid, total     104,226 59,501
Net reserves for unpaid losses and loss adjustment expenses, end of period 933,488 687,378 933,488 687,378
Reinsurance recoverable on unpaid losses, end of period 498,864 347,793 498,864 347,793
Gross reserves for losses and loss adjustment expenses, end of period $ 1,432,352 $ 1,035,171 $ 1,432,352 $ 1,035,171