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Cover - USD ($)
 12 Months Ended
Dec. 31, 2024
Feb. 11, 2025
Jun. 30, 2024
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2024    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-37875    
Entity Registrant Name FB FINANCIAL CORPORATION    
Entity Incorporation, State or Country Code TN    
Entity Tax Identification Number 62-1216058    
Entity Address, Address Line One 1221 Broadway    
Entity Address, Address Line Two Suite 1300    
Entity Address, City or Town Nashville    
Entity Address, State or Province TN    
Entity Address, Postal Zip Code 37203    
City Area Code 615    
Local Phone Number 564-1212    
Title of 12(b) Security Common Stock, Par Value $1.00 Per Share    
Trading Symbol FBK    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Reporting Company false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction false    
Entity Shell Company false    
Entity Public Float     $ 1,363,325,628
Entity Common Stock, Shares Outstanding   46,678,175  
Documents Incorporated by Reference
Portions of the registrant’s Definitive Proxy Statement relating to the registrant's 2024 Annual Meeting of Shareholders, which will be filed within 120 days after December 31, 2024, are incorporated by reference into Part III of this Annual Report on Form 10-K.
    
Amendment Flag false    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Entity Central Index Key 0001649749