Reinsurance - Net Premiums Written and Earned, Insurance (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Ceded Credit Risk [Line Items]
Direct premiums written	$ 255,391	$ 248,245	$ 507,774	$ 492,917
Ceded premiums written, net	(19,833)	(31,009)	(38,481)	(44,473)
Net Premiums Written	235,558	217,236	469,293	448,444
Direct premiums earned	264,421	259,314	527,076	517,729
Ceded premiums earned	(26,690)	(45,885)	(53,488)	(71,062)
Total net premiums earned	237,731	213,429	473,588	446,667
Ceding commissions earned	6,345	5,052	12,458	10,303
Ceded losses	3,004		5,199
Ceded losses		(1,218)		(2,384)
Deferred ceding commissions	17,000		17,000		$ 20,000
Eagle Re 2019-1 Ltd. and Eagle Re 2020-1 Ltd. | Radian Guaranty
Ceded Credit Risk [Line Items]
Ceded premiums earned		(21,000)
Mortgage insurance
Ceded Credit Risk [Line Items]
Direct premiums written	252,388	245,448	502,823	488,232
Ceded premiums written, net	(19,743)	(30,909)	(38,301)	(44,273)
Direct premiums earned	261,418	256,517	522,125	513,044
Ceded premiums earned	(26,600)	(45,785)	(53,308)	(70,862)
Title insurance
Ceded Credit Risk [Line Items]
Direct premiums written	3,003	2,797	4,951	4,685
Ceded premiums written, net	(90)	(100)	(180)	(200)
Direct premiums earned	3,003	2,797	4,951	4,685
Ceded premiums earned	$ (90)	$ (100)	$ (180)	$ (200)