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Schedule IV Reinsurance | 12 Months Ended
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Dec. 31, 2020
Reinsurance Insurance Premiums Earned [Abstract] |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Text Block] | Radian Group Inc. Schedule IV—Reinsurance Insurance Premiums Earned Years Ended December 31, 2020, 2019 and 2018
($ in thousands) Premiums Earned |  | Gross Amount |  | Ceded to Other Companies |  | Assumed from Other Companies |  | Net Amount |  | Assumed Premiums as a Percentage of Net Premiums
2020 |  |  |  |  |  |  |  |  |  |
Mortgage Insurance |  | $ | 1,263,684 |  |  | $ | 183,130 |  |  | $ | 12,213 |  |  | $ | 1,092,767 |  |  | 1.12 | %
Title Insurance |  | 22,843 |  |  | 289 |  |  | — |  |  | 22,554 |  |  | 0.00 | %
Total |  | $ | 1,286,527 |  |  | $ | 183,419 |  |  | $ | 12,213 |  |  | $ | 1,115,321 |  |  | 1.10 | %
2019 |  |  |  |  |  |  |  |  |  |
Mortgage Insurance |  | $ | 1,233,528 |  |  | $ | 109,696 |  |  | $ | 10,382 |  |  | $ | 1,134,214 |  |  | 0.92 | %
Title Insurance |  | 11,342 |  |  | 207 |  |  | — |  |  | 11,135 |  |  | 0.00 | %
Total |  | $ | 1,244,870 |  |  | $ | 109,903 |  |  | $ | 10,382 |  |  | $ | 1,145,349 |  |  | 0.91 | %
2018 |  |  |  |  |  |  |  |  |  |
Mortgage Insurance |  | $ | 1,066,860 |  |  | $ | 67,047 |  |  | $ | 6,904 |  |  | $ | 1,006,717 |  |  | 0.69 | %
Title Insurance |  | 7,438 |  |  | 148 |  |  | — |  |  | 7,290 |  |  | 0.00 | %
Total |  | $ | 1,074,298 |  |  | $ | 67,195 |  |  | $ | 6,904 |  |  | $ | 1,014,007 |  |  | 0.68 | %

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- Definition Reinsurance Insurance Premiums Earned [Abstract] + References No definition available. + Details
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- Definition The entire disclosure for the supplemental schedule of reinsurance information. Reinsurance schedule includes, but is not limited to, the type of insurance, gross amount of premiums, premiums ceded to other entities, premiums assumed from other entities, net amount of premium revenue, and the percentage of the premiums assumed to net premium revenue. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17) -URI http://asc.fasb.org/extlink&oid=120401096&loc=d3e574992-122915 + Details
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