Reserve for Losses and Loss Adjustment Expenses - Reconciliation of Beginning and Ending Reserve Balances (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Gross reserves for losses and loss adjustment expenses, beginning of year			$ 756,859,000	$ 431,186,000
Reinsurance recoverable on unpaid losses, beginning of year			246,915,000	136,273,000
Net reserves for unpaid losses and loss adjustment expenses, beginning of year			509,944,000	294,913,000
Net incurred losses and loss adjustment expenses related to:
Current accident year			234,926,000	181,162,000
Prior accident years			2,009,000	0
Liability for unpaid claims and claims adjustment expense, incurred claims, total	$ 84,608,000	$ 67,824,000	236,935,000	181,162,000
Net paid losses and loss adjustment expenses related to:
Current accident year			2,663,000	2,106,000
Prior accident years			56,838,000	17,071,000
Liability for unpaid claims and claims adjustment expense, claims paid, total			59,501,000	19,177,000
Net reserves for unpaid losses and loss adjustment expenses, end of period	687,378,000	456,897,000	687,378,000	456,897,000
Reinsurance recoverable on unpaid losses, end of period	347,793,000	222,671,000	347,793,000	222,671,000
Gross reserves for losses and loss adjustment expenses, end of period	$ 1,035,171,000	$ 679,568,000	$ 1,035,171,000	$ 679,568,000