Related Party Transactions (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Related Party Transaction [Line Items]
Ceded written premiums	$ 82,492,000	$ 68,643,000	$ 224,079,000	$ 179,710,000
Related Party
Related Party Transaction [Line Items]
Ceded written premiums	9,300,000	8,300,000	25,600,000	20,200,000
Related Party | Ceding Fees
Related Party Transaction [Line Items]
Related party transaction, amounts of transaction	$ 3,900,000	2,400,000	$ 9,300,000	6,200,000
Related Party | AmFam
Related Party Transaction [Line Items]
Quota share agreement, percentage	100.00%		100.00%
Related Party | BIHL
Related Party Transaction [Line Items]
Capital contribution from parent, accumulated contributions			$ 183,300,000
Capital contribution from parent, contributed amount	$ 0	0	0	4,500,000
Related Party | AmFam
Related Party Transaction [Line Items]
Ceded written premiums	9,300,000	$ 8,300,000	25,600,000	$ 20,200,000
Related Party | Bold Penguin
Related Party Transaction [Line Items]
Related party transaction, amounts of transaction	$ 100,000		$ 100,000