Reinsurance - Net Premiums Written and Earned, Insurance (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Ceded Credit Risk [Line Items]
Direct premiums written	$ 259,501	$ 251,502	$ 767,275	$ 744,419
Ceded premiums written, net	(21,864)	(12,871)	(60,345)	(57,344)
Net Premiums Written	237,637	238,631	706,930	687,075
Direct premiums earned	267,588	261,768	794,664	779,497
Ceded premiums earned	(28,455)	(21,506)	(81,943)	(92,568)
Total net premiums earned	239,133	240,262	712,721	686,929
Ceding commissions earned	6,672	5,650	19,130	15,953
Ceded losses	3,161	1,289	8,360
Ceded losses				(1,095)
Deferred ceding commissions	16,000		16,000		$ 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	255,422	247,941	758,245	736,173
Ceded premiums written, net	(21,774)	(12,771)	(60,075)	(57,044)
Direct premiums earned	263,509	258,207	785,634	771,251
Ceded premiums earned	(28,365)	(21,406)	(81,673)	(92,268)
Title insurance
Ceded Credit Risk [Line Items]
Direct premiums written	4,079	3,561	9,030	8,246
Ceded premiums written, net	(90)	(100)	(270)	(300)
Direct premiums earned	4,079	3,561	9,030	8,246
Ceded premiums earned	$ (90)	$ (100)	$ (270)	$ (300)