Other Assets and Liabilities - Schedule of Other Liabilities (Details) - USD ($) $ in Thousands		Jun. 30, 2025	Dec. 31, 2024
Other Assets and Liabilities [Abstract]
Amount payable under securities lending agreements	[1]	$ 164,529	$ 125,723
Reinsurance funds withheld	[2]	128,165	121,983
Payable for securities		34,218	0
Lease liability		33,784	37,442
Accrued compensation		31,321	55,971
Current federal income taxes		25,807	23,290
Other		72,341	67,147
Total other liabilities		$ 490,165	$ 431,556

[1] Represents the obligation to return cash collateral under our securities lending agreements. See Note 6 for additional information.

[2] Represents ceded premiums written held by Radian Guaranty to collateralize our reinsurers’ obligations primarily related to our Single Premium QSR Program. See Note 8 for additional information.