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Cover Page - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2019
Feb. 26, 2020
Jun. 30, 2019
Cover page.      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2019    
Document Transition Report false    
Entity File Number 001-34257    
Entity Registrant Name UNITED FIRE GROUP, INC    
Entity Incorporation, State or Country Code IA    
Entity Tax Identification Number 45-2302834    
Entity Address, Address Line One 118 Second Avenue SE    
Entity Address, City or Town Cedar Rapids    
Entity Address, State or Province IA    
Entity Address, Postal Zip Code 52401    
City Area Code 319    
Local Phone Number  399-5700    
Title of 12(b) Security Common Stock, $0.001 par value    
Trading Symbol UFCS    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 1.0
Entity Common Stock, Shares Outstanding   25,051,170  
Documents Incorporated by Reference
Part III of this Form 10-K incorporates by reference certain information from the registrant's definitive proxy statement to be filed with the Securities and Exchange Commission pursuant to Regulation 14A of the Securities Exchange Act of 1934, as amended, for its annual shareholder meeting to be held on May 20, 2020.
    
Amendment Flag false    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Entity Central Index Key 0000101199    
Current Fiscal Year End Date --12-31