SEC Schedule, Article 12-16, Supplementary Insurance Information (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Liability for Claims and Claims Adjustment Expense	$ 349,062				$ 197,089				$ 349,062	$ 197,089
Deferred Policy Acquisition Cost	8,572				10,960				8,572	10,960
Unearned premiums	182,446				154,878				182,446	154,878
Net premiums earned	18,931	$ 27,441	$ 27,054	$ 25,579	24,945	$ 12,187	$ 7,785	$ 6,995	99,005	51,911	$ 13,869
Net investment income, net investment gains (losses), including impairments	3,557	3,488	3,763	3,640	3,588	3,663	3,027	2,881	14,448	13,159	4,503
Loss and loss adjustment expenses (benefit)	9,826	20,421	23,024	19,355	16,805	9,509	5,739	4,659	72,626	36,712	9,071
Policy acquisition costs	7,850	5,993	5,399	4,424	5,851	1,956	1,351	1,399	23,666	10,557	2,535
General and Administrative Expense	40,444	44,681	28,336	18,050	21,193	17,914	17,117	11,839	129,166	66,985	56,278
Premiums Written, Net	(2,608)	$ 32,754	$ 32,289	$ 26,247	36,750	$ 24,768	$ 9,120	$ 9,187	88,682	79,825	28,553
Specialty Property & Casualty Program [Domain]
Liability for Claims and Claims Adjustment Expense	349,062				197,089				349,062	197,089	89,907
Deferred Policy Acquisition Cost	8,572				10,960				8,572	10,960	3,362
Unearned premiums	$ 182,446				$ 154,878				182,446	154,878	85,415
Net premiums earned									99,005	51,911	13,869
Net investment income, net investment gains (losses), including impairments									6,399	3,795	1,605
Loss and loss adjustment expenses (benefit)									72,626	36,712	9,071
Policy acquisition costs									23,666	10,557	2,535
General and Administrative Expense									17,806	16,452	13,205
Premiums Written, Net									$ 88,682	$ 79,824	$ 28,554