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Statutory Information - Statutory Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Radian Guaranty
Statutory Accounting Practices [Line Items]
Statutory net income (loss)	$ 864,681	$ 516,866
Statutory policyholders' surplus	738,625		$ 778,148
Radian Reinsurance
Statutory Accounting Practices [Line Items]
Statutory net income (loss)	2,724	8,765
Statutory policyholders' surplus	292,121		327,118
Other mortgage subsidiaries
Statutory Accounting Practices [Line Items]
Statutory net income (loss)	1,826	777
Statutory policyholders' surplus	16,246		14,524
Radian Title Insurance
Statutory Accounting Practices [Line Items]
Statutory net income (loss)	2,500	$ 4,777
Statutory policyholders' surplus	$ 39,241		$ 36,599

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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.

+ References

No definition available.

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- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(23)(c))
-URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 505
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=6486098&loc=d3e24708-158529

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(23)(c))
-URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910

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