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Note 16 - Statutory Information Risk To Capital Calculation (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 USD ($) state | Dec. 31, 2017 USD ($)
Risk to Capital Line Items [Line Items] |  |  |
Number Of States That Have A Statutory Or Regulatory Risk Based Capital Requirement | state |  | 16 |
Risk To Capital Ratio, Regulatory Maximum |  | 25 |
Radian Guaranty |  |  |
Risk to Capital Line Items [Line Items] |  |  |
Statutory Accounting Practices, Statutory Capital and Surplus, Increase (Decrease) |  | $ 112.8 |
RIF, net (1) | [1] | 37,571.1 | $ 36,793.5
Common stock and paid-in capital |  | 1,866.0 | 1,866.0
Surplus Notes |  | 100.0 | 100.0
Unassigned earnings (deficit) |  | (758.8) | (765.0)
Statutory policyholders’ surplus |  | 1,207.2 | 1,201.0
Contingency reserve |  | 1,773.6 | 1,667.0
Statutory capital |  | $ 2,980.8 | $ 2,868.0
Risk-to-capital |  | 12.6 | 12.8
Statutory Accounting Practices, Statutory Net Income Amount |  | $ 111.9 |
Non RBC States [Member] | Minimum [Member] |  |  |
Risk to Capital Line Items [Line Items] |  |  |
Capital Required for Capital Adequacy |  | 1.0 |
Non RBC States [Member] | Maximum [Member] |  |  |
Risk to Capital Line Items [Line Items] |  |  |
Capital Required for Capital Adequacy |  | $ 5.0 |
Reportable Subsegments [Member] |  |  |
Risk to Capital Line Items [Line Items] |  |  |
Risk-to-capital |  | 11.9 | 12.1
[1] | Excludes risk ceded through reinsurance contracts (to third parties and affiliates) and RIF on defaulted loans.

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- Definition This concept represents the risk in force (an estimate of the maximum loss exposure that an entity has at any point in time) net of risk ceded through reinsurance contracts and net of risk in force on defaulted loans. + References No definition available. + Details
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- Definition Number Of States That Have A Statutory Or Regulatory Risk Based Capital Requirement + References No definition available. + Details
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- Definition This concept represents an entity's ratio of net risk in force (excludes risk ceded through reinsurance contracts and risk in force on defaulted loans) to the amount of statutory capital (defined as the sum of statutory policyholders' surplus plus statutory contingency reserves). + References No definition available. + Details
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- Definition This concept represents the maximum ratio of net risk in force (net of risk ceded through reinsurance contracts and risk in force on defaulted loans) to statutory capital (defined as the sum of statutory policyholders' surplus plus statutory contingency reserves) allowed in those states which have statutory risk-based capital requirements. + References No definition available. + Details
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- Definition This concept represents statutory surplus plus contingency reserves, the total of which is used in the calculation of risk to capital. + References No definition available. + Details
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- Definition The change in the statutory capital and surplus of an entity during the period. + References No definition available. + Details
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- Definition The amount of total capital as defined in the regulations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6490092&loc=d3e47304-110998 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6490092&loc=d3e47080-110998 + Details
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- Definition Financial instruments issued by insurance entities (surplus notes) that are includable in surplus for statutory accounting purposes as prescribed or permitted by state laws and regulations that are liabilities of the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6486086&loc=d3e24387-158525 + Details
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