Property and Casualty Insurance Activity - Schedule of Material Terms for Reinsurance Treaties (Details) $ in Thousands	3 Months Ended	6 Months Ended							7 Months Ended	9 Months Ended	12 Months Ended							36 Months Ended
	Sep. 30, 2024 USD ($)	Jun. 30, 2025 USD ($)	Dec. 31, 2024 USD ($)	Jun. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)	Jun. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)	Jun. 30, 2022 USD ($)	Apr. 30, 2025 USD ($)	Sep. 30, 2024 USD ($) h	Dec. 31, 2025	Jun. 30, 2025 USD ($)	Dec. 31, 2024	Jun. 30, 2024 USD ($)	Dec. 31, 2023	Jun. 30, 2023 USD ($)	Dec. 31, 2022	Dec. 31, 2024 USD ($)
Effects of Reinsurance [Line Items]
Single risk coverage										$ 9,000
Catastrophe coverage, multiple of per occurrence limitation										2
Catastrophe coverage, number of consecutive hours | h										168
Reinstatement of premium protection														$ 50,000		$ 12,500
Excess of catastrophe coverage														$ 10,000		$ 10,000
Limited retention										$ 1,000
Minimum
Effects of Reinsurance [Line Items]
Direct loss	$ 3,500									3,500
Reduces retention										500
Maximum
Effects of Reinsurance [Line Items]
Direct loss	$ 9,000									9,000
Reduces retention										$ 700
Forecast
Effects of Reinsurance [Line Items]
Reinstatement of premium protection									$ 4,500			$ 10,500						$ 400
Excess of catastrophe coverage									5,500			10,000						$ 600
Limited retention									$ 4,800
Forecast | Minimum
Effects of Reinsurance [Line Items]
Reduces retention												530
Forecast | Maximum
Effects of Reinsurance [Line Items]
Reduces retention												$ 730
Catastrophe Reinsurance:
Effects of Reinsurance [Line Items]
Initial loss subject to personal lines quota share treaty				$ 10,000	$ 10,000	$ 10,000	$ 10,000	$ 10,000
Risk retained per catastrophe occurrence				9,500	8,750	8,750	7,400	7,400
Catastrophe loss coverage in excess of quota share coverage				$ 315,000	$ 315,000	$ 335,000	$ 335,000	$ 490,000
Reinstatement premium protection				Yes	Yes	Yes	Yes	Yes
Catastrophe Reinsurance: | Forecast
Effects of Reinsurance [Line Items]
Initial loss subject to personal lines quota share treaty			$ 10,000
Risk retained per catastrophe occurrence		$ 5,000	4,750
Catastrophe loss coverage in excess of quota share coverage		$ 275,000	$ 275,000
Reinstatement premium protection		Yes	Yes
Personal Lines:
Effects of Reinsurance [Line Items]
Quota share treaty percent ceded				27.00%	30.00%	30.00%	30.00%	30.00%							30.00%		30.00%
Risk retained on initial $1,000,000 of losses				$ 730	$ 700	$ 700	$ 700	$ 700
Losses per occurrence subject to quota share reinsurance coverage				1,000	1,000	1,000	1,000	1,000
Excess of loss coverage and facultative facility coverage				8,400	8,400	8,400	8,400	8,400
in excess of 1				600	600	600	600	600
Total reinsurance coverage per occurrence				8,470	8,500	8,500	8,500	8,500
Losses per occurrence subject to reinsurance coverage				$ 9,000	$ 9,000	$ 9,000	$ 9,000	$ 9,000
Quota share treaty percent excluded from percent ceded															17.50%		4.00%
Personal Lines: | Forecast
Effects of Reinsurance [Line Items]
Quota share treaty percent ceded			27.00%								27.00%		27.00%
Risk retained on initial $1,000,000 of losses		$ 1,000	$ 730
Losses per occurrence subject to quota share reinsurance coverage			1,000
Excess of loss coverage and facultative facility coverage		8,000	8,400
in excess of 1		1,000	600
Total reinsurance coverage per occurrence		8,000	8,470
Losses per occurrence subject to reinsurance coverage		$ 9,000	$ 9,000
Quota share treaty percent excluded from percent ceded											22.00%