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Statutory Information - Schedule of Statutory Net Income (Loss) and Statutory Policyholders' Surplus (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Radian Guaranty
Statutory Accounting Practices [Line Items]
Statutory net income (loss)	$ 550,343	$ 588,122
Statutory policyholders' surplus	661,022		$ 722,861
Other Mortgage Insurance Subsidiaries
Statutory Accounting Practices [Line Items]
Statutory net income (loss)	843	$ (1,295)
Statutory policyholders' surplus	$ 16,818		$ 16,515

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The amount of statutory capital and surplus (stockholders' equity) as of the balance sheet date using prescribed or permitted statutory accounting practices (rather than GAAP, if different) of the state or country.

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Amount of net income for the period determined using accounting principles prescribed or permitted by insurance regulators.

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