Reinsurance - Excess of Loss Reinsurance (Details) $ in Thousands										6 Months Ended	12 Months Ended
	Jun. 01, 2025 USD ($)	Mar. 01, 2025 USD ($)	Apr. 01, 2024 USD ($)	Oct. 23, 2023 USD ($)	Apr. 01, 2023 USD ($)	Apr. 26, 2022 USD ($)	Apr. 01, 2022 USD ($)	Aug. 03, 2021 USD ($)	Feb. 02, 2021 USD ($)	Jun. 30, 2025 USD ($)	Dec. 31, 2024 USD ($)
Eligible New Insurance Written In 2026
Effects of Reinsurance [Line Items]
Excess of loss reinsurance coverage, initial and remaining										$ 184,000
2025 Traditional XOL
Effects of Reinsurance [Line Items]
Amortization period excess of loss reinsurance coverage	10 years
Excess of loss reinsurance coverage, initial and remaining	$ 160,000
2024 Traditional XOL
Effects of Reinsurance [Line Items]
Amortization period excess of loss reinsurance coverage			10 years
Initial First Layer Retention			$ 125,016
Remaining First Layer Retention										124,948	$ 125,016
Excess of loss reinsurance coverage, initial and remaining			$ 187,220							187,220	187,220
2023 Traditional XOL
Effects of Reinsurance [Line Items]
Amortization period excess of loss reinsurance coverage					10 years
Initial First Layer Retention					$ 70,578
Remaining First Layer Retention										70,006	70,401
Excess of loss reinsurance coverage, initial and remaining					$ 96,942					79,196	91,404
2022 Traditional XOL
Effects of Reinsurance [Line Items]
Amortization period excess of loss reinsurance coverage							10 years
Initial First Layer Retention							$ 82,523
Remaining First Layer Retention										79,712	81,112
Excess of loss reinsurance coverage, initial and remaining							$ 142,642			109,115	124,344
2020 Traditional XOL
Effects of Reinsurance [Line Items]
Amortization period excess of loss reinsurance coverage		10 years
Initial First Layer Retention		$ 68,343
Remaining First Layer Retention										68,343
Excess of loss reinsurance coverage, initial and remaining		$ 250,592								$ 250,592
Excess of Loss Reinsurance Transactions, Home Re Transactions
Effects of Reinsurance [Line Items]
Percent of reinsurance coverage threshold, option to terminate (as a percent)										10.00%
Home Re 2023-1
Effects of Reinsurance [Line Items]
Term of mortgage insurance-linked notes				10 years
Initial First Layer Retention				$ 272,961
Remaining First Layer Retention										$ 270,109	272,269
Excess of loss reinsurance coverage, initial and remaining				$ 330,277						$ 267,327	299,325
Reinsurance Retention Policy, Funding Percentage				0.97						0.96
Home Re 2022-1
Effects of Reinsurance [Line Items]
Term of mortgage insurance-linked notes						12 years 6 months
Initial First Layer Retention						$ 325,589
Remaining First Layer Retention										$ 321,021	322,566
Excess of loss reinsurance coverage, initial and remaining						$ 473,575				$ 254,880	305,639
Reinsurance Retention Policy, Funding Percentage						1				1
Home Re 2021-2
Effects of Reinsurance [Line Items]
Term of mortgage insurance-linked notes								12 years 6 months
Initial First Layer Retention								$ 190,159
Remaining First Layer Retention										$ 187,496	188,211
Excess of loss reinsurance coverage, initial and remaining								$ 398,429		$ 108,377	132,424
Reinsurance Retention Policy, Funding Percentage								1		0.93
Home Re 2021-1
Effects of Reinsurance [Line Items]
Term of mortgage insurance-linked notes									12 years 6 months
Initial First Layer Retention									$ 211,159
Remaining First Layer Retention										$ 209,654	210,027
Excess of loss reinsurance coverage, initial and remaining									$ 398,848	$ 59,327	$ 92,019
Reinsurance Retention Policy, Funding Percentage									1	1