v3.26.1
Reserve for Losses and Loss Adjustment Expenses - Schedule of Reconciliation of The Beginning And Ending Reserve Balances (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 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 90,879 72,983
Prior accident years 602 444
Liability for unpaid claims and claims adjustment expense, incurred claims, total 91,481 73,427
Net paid losses and loss adjustment expenses related to:    
Current accident year 639 549
Prior accident years 31,189 16,386
Liability for unpaid claims and claims adjustment expense, claims paid, total 31,828 16,935
Net reserves for unpaid losses and loss adjustment expenses, end of period 807,892 566,436
Reinsurance recoverable on unpaid losses, end of period 412,908 278,788
Gross reserves for losses and loss adjustment expenses, end of period $ 1,220,800 $ 845,224