Segment Reporting - Schedules of Concentration of Risk, by Risk Factor (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Segment Reporting Information [Line Items]
Gross written premiums	$ 167,502	$ 126,614	$ 283,645	$ 208,219
Revenue Benchmark | Product Concentration Risk
Segment Reporting Information [Line Items]
Gross written premiums percentage	100.00%	100.00%	100.00%	100.00%
Casualty
Segment Reporting Information [Line Items]
Gross written premiums	$ 107,023	$ 68,300	$ 189,163	$ 118,806
Casualty | Revenue Benchmark | Product Concentration Risk
Segment Reporting Information [Line Items]
Gross written premiums percentage	63.90%	53.90%	66.70%	57.10%
Property
Segment Reporting Information [Line Items]
Gross written premiums	$ 60,479	$ 58,314	$ 94,482	$ 89,413
Property | Revenue Benchmark | Product Concentration Risk
Segment Reporting Information [Line Items]
Gross written premiums percentage	36.10%	46.10%	33.30%	42.90%