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Investments - Schedule of Net Investment Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Marketable Securities [Line Items]
Gross investment income	$ 11,713
Gross investment income		$ 5,313	$ 28,495	$ 12,925
Investment expenses	(222)	(125)	(567)	(336)
Net investment income	11,491	5,188	27,928	12,589
U.S. government and government agency
Marketable Securities [Line Items]
Gross investment income	3,793
Gross investment income		1,224	11,316	2,162
State and municipal
Marketable Securities [Line Items]
Gross investment income	467
Gross investment income		387	1,241	1,163
Commercial mortgage-backed securities
Marketable Securities [Line Items]
Gross investment income	761
Gross investment income		375	1,603	1,003
Residential mortgage-backed securities
Marketable Securities [Line Items]
Gross investment income	1,955
Gross investment income		256	4,118	718
Asset-backed securities
Marketable Securities [Line Items]
Gross investment income	719
Gross investment income		1,044	1,760	2,537
Corporate
Marketable Securities [Line Items]
Gross investment income	1,611
Gross investment income		925	3,614	2,514
Short-term investments
Marketable Securities [Line Items]
Gross investment income	134
Gross investment income		186	350	817
Cash and cash equivalents
Marketable Securities [Line Items]
Gross investment income	$ 2,273
Gross investment income		$ 916	$ 4,493	$ 2,011

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