Mortgage Loans Held for Sale - Narrative (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2024 USD ($) investment state	Dec. 31, 2023 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Mortgage loans held for sale—at fair value (Note 7)	$ 458,096	$ 32,755
Number of investments | investment	516
Unpaid principal balance	$ 454,000
Number of states | state	39
Commitments to purchase and fund mortgage loans	$ 391,000
Radian Mortgage Capital
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Minimum net worth for debt covenants	$ 4,000