Reinsurance - Excess of Loss Reinsurance (Details) $ in Thousands									3 Months Ended	12 Months Ended
	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 ($)	Feb. 02, 2021 USD ($)	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)
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									$ 124,985	$ 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									70,218	70,401
Excess of loss reinsurance coverage, initial and remaining				$ 96,942					87,542	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									80,346	81,112
Excess of loss reinsurance coverage, initial and remaining						$ 142,642			118,729	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									$ 271,268	272,269
Excess of loss reinsurance coverage, initial and remaining			$ 330,277						$ 285,333	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									$ 321,918	322,566
Excess of loss reinsurance coverage, initial and remaining					$ 473,575				$ 282,008	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									$ 187,889	188,211
Excess of loss reinsurance coverage, initial and remaining							$ 398,429		$ 120,163	132,424
Reinsurance Retention Policy, Funding Percentage							1		0.88
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									$ 209,913	210,027
Excess of loss reinsurance coverage, initial and remaining								$ 398,848	$ 75,906	$ 92,019
Reinsurance Retention Policy, Funding Percentage								1	1