Description of Business	9 Months Ended
Description of Business	Sep. 30, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business	Description of Business We are a diversified mortgage and real estate business, providing both credit-related mortgage insurance coverage and an array of other mortgage, risk, title, real estate and technology products and services. We have two reportable business segments—Mortgage and homegenius. Mortgage Our Mortgage segment provides credit-related insurance coverage, principally through private mortgage insurance on residential first-lien mortgage loans, as well as contract underwriting and other credit risk management solutions, to mortgage lending institutions and mortgage credit investors. We provide our mortgage insurance products and services mainly through our wholly-owned subsidiary, Radian Guaranty. Private mortgage insurance plays an important role in the U.S. housing finance system because it promotes affordable home ownership and helps protect mortgage lenders and mortgage investors, as well as other beneficiaries such as the GSEs, by mitigating default-related losses on residential mortgage loans. Generally, these loans are made to homebuyers who make down payments of less than 20% of the purchase price for their home or, in the case of refinancings, have less than 20% equity in their home. Private mortgage insurance also facilitates the sale of these low down payment loans in the secondary mortgage market, almost all of which are currently sold to the GSEs. Our total direct primary mortgage IIF and RIF were $259.1 billion and $65.3 billion, respectively, as of September 30, 2022, compared to $246.0 billion and $60.9 billion, respectively, as of December 31, 2021. In addition to providing private mortgage insurance, we have participated in credit risk transfer programs developed by the GSEs as part of their initiative to distribute mortgage credit risk and increase the role of private capital in the mortgage market. Our additional RIF under credit risk transfer transactions, resulting from our participation in these programs with the GSEs, totaled $276.2 million as of September 30, 2022, compared to $417.7 million as of December 31, 2021. The GSEs and state insurance regulators impose various capital and financial requirements on our mortgage insurance subsidiaries. These include the PMIERs financial requirements as well as risk-to-capital and other risk-based capital measures and surplus requirements. Failure to comply with these capital and financial requirements may limit the amount of insurance that our mortgage insurance subsidiaries write, or may prohibit them from writing insurance altogether. The GSEs and state insurance regulators possess significant discretion with respect to our mortgage insurance subsidiaries and most aspects of their business. See Note 16 for additional information on PMIERs and other regulatory information. homegenius Our homegenius segment is primarily a fee-for-service business that offers an array of products and services to market participants across the real estate value chain. Our homegenius products and services include title, real estate and technology products and services offered primarily to consumers, mortgage lenders, mortgage and real estate investors, GSEs, real estate brokers and agents. These products and services help lenders, investors, consumers and real estate agents evaluate, manage, monitor, acquire and sell properties. They include SaaS solutions and platforms, as well as managed services, such as real estate owned asset management, single family rental services and real estate valuation services. In addition, we provide title insurance and non-insurance title, closing and settlement services to mortgage lenders, GSEs and mortgage investors, as well as directly to consumers for residential mortgage loans. See Note 4 for additional information about our reportable segments and All Other business activities. Risks and Uncertainties In assessing the Company’s current financial condition and developing forecasts of future operations, management has made significant judgments and estimates with respect to potential factors impacting our financial and liquidity position. These judgments and estimates are subject to risks and uncertainties that could affect amounts reported in our financial statements in future periods and that could cause actual results to be materially different from our estimates, including as a result of macroeconomic stresses such as inflation, slower economic growth and higher levels of unemployment. The U.S. economy is currently experiencing a high rate of inflation and slower economic growth, with annual inflation reaching a 40-year high in September 2022. Recent actions taken by the U.S. Federal Reserve to increase interest rates in response to these inflationary pressures led to a sharp and significant increase in mortgage interest rates during the first nine months of 2022. The U.S. Federal Reserve raised rates further in the fourth quarter of 2022 and has signaled that it expects to continue to increase rates in future periods. While we expect these interest rate increases to continue to negatively impact certain aspects of our results, including through lower NIW, lower homegenius revenues and lower investment fair values, we also expect to benefit from the rate increases due to higher Persistency Rates that will favorably impact our IIF, as well as through the recognition of higher net investment income. The current economic conditions have negatively impacted the U.S. housing market, which has experienced decreasing home prices in recent months in many markets, significantly reduced refinance activity and a reduced amount of new purchase transactions. Further, risk of a recession and the likelihood of an increase in unemployment rates increase the likelihood that we will experience greater default activity and lower levels of Cures in our mortgage insurance portfolio.