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Document and Entity Information
Dec. 07, 2021
Document And Entity Information [Line Items]  
Document Type 8-K
Document Period End Date Dec. 07, 2021
Entity Registrant Name Radian Group Inc.
Entity Incorporation, State or Country Code DE
Entity File Number 001-11356
Entity Tax Identification Number 23-2691170
Entity Address, Address Line One 550 East Swedesford Road
Entity Address, Address Line Two Suite 350
Entity Address, City or Town Wayne
Entity Address, State or Province PA
Entity Address, Postal Zip Code 19087
City Area Code 800
Local Phone Number 523-1988
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common Stock, $0.001 par value per share
Trading Symbol RDN
Security Exchange Name NYSE
Entity Emerging Growth Company false
Amendment Flag false
Entity Central Index Key 0000890926
Former Address [Member]  
Document And Entity Information [Line Items]  
Entity Address, Address Line One 1500 Market Street
Entity Address, City or Town Philadelphia
Entity Address, State or Province PA
Entity Address, Postal Zip Code 19102