Investments - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Gross unrealized gain (loss) on available for sale securities			$ 10,200,000
Gross realized gains from sales of available-for-sale debt securities	$ 10,000	$ 0	10,000	$ 0
Gross realized losses from sales of available-for-sale debt securities	17,000	0	17,000	0
Proceeds from sale of debt securities, available-for-sale			1,800,000	0
Amount payable for securities purchased	8,000,000	0	8,000,000	0
Amount receivable for securities sold	0	0	0	0
Gross unrealized gains			350,000		$ 505,000
Gross unrealized losses			563,000		535,000
Other than temporary impairments losses, investments	0	$ 0	0	$ 0
Investments	250,000		250,000		1,400,000
Deposits held in trust accounts	8,300,000		8,300,000		8,200,000
Deposits, held in trust for collateral requirements	$ 107,500,000		107,500,000		$ 123,500,000
Collateral of gross unearned premiums and gross loss reserves			106,800,000
Unearned premiums run off			$ 0