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Reserve for Losses and Loss Adjustment Expenses - Reconciliation of Beginning and Ending Reserve Balances (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]        
Gross reserves for losses and loss adjustment expenses, beginning of year     $ 431,186 $ 207,051
Reinsurance recoverable on unpaid losses, beginning of year     136,273 63,381
Net reserves for unpaid losses and loss adjustment expenses, beginning of year     294,913 143,670
Net incurred losses and loss adjustment expenses related to:        
Current accident year     181,162 113,028
Prior accident years     0 636
Liability for unpaid claims and claims adjustment expense, incurred claims, total $ 67,824 $ 42,796 181,162 113,664
Net paid losses and loss adjustment expenses related to:        
Current accident year     2,106 1,028
Prior accident years     17,071 6,344
Liability for unpaid claims and claims adjustment expense, claims paid, total     19,177 7,372
Net reserves for unpaid losses and loss adjustment expenses, end of period 456,897 249,962 456,897 249,962
Reinsurance recoverable on unpaid losses, end of period 222,671 114,368 222,671 114,368
Gross reserves for losses and loss adjustment expenses, end of period $ 679,568 $ 364,330 $ 679,568 $ 364,330