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Document and Entity Information - shares
 3 Months Ended
Mar. 31, 2021
May 10, 2021
Cover [Abstract]    
Document Type 10-Q/A  
Amendment Flag true  
Document Period End Date Mar. 31, 2021  
Document Fiscal Year Focus 2021  
Document Fiscal Period Focus Q1  
Entity Registrant Name FIRST MID BANCSHARES, INC.  
Entity Central Index Key 0000700565  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Current Fiscal Year End Date --12-31  
Entity Filer Category Accelerated Filer  
Entity Common Stock, Shares Outstanding   18,074,755
Entity Shell Company false  
Entity Small Business false  
Entity Emerging Growth Company false  
Title of 12(b) Security Common Stock  
Trading Symbol FMBH  
Security Exchange Name NASDAQ  
Entity File Number 0-13368  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 37-1103704  
Entity Address, Address Line One 1421 Charleston Avenue  
Entity Address, City or Town Mattoon  
Entity Address, State or Province IL  
Entity Address, Postal Zip Code 61938  
City Area Code 217  
Local Phone Number 234-7454  
Document Quarterly Report true  
Document Transition Report false  
Amendment Description This  Quarterly Report on Form 10-Q/A (the “Amendment”) solely modifies the cover page of  Form 10-Q for the quarterly period ended March 31, 2021, originally filed with the U.S. Securities and Exchange Commission on May 10, 2021 (the “Original Form 10-Q”), to correct an error reflected in the number of shares of common stock outstanding. Specifically, the inadvertent error reports, “As of May 11, 2021 16,736,442 common shares, $4.00 par value, were outstanding.” The number of shares of the registrant’s common stock outstanding as of the filing date, May 10, 2021, was 18,074,755. All other items of the Original Form 10-Q are unaffected by this Amendment and such items have not been included in this Amendment. Information included in this Amendment does not reflect any subsequent event occurring after the filing of the Original Form 10-Q.