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Document and Entity Information
Aug. 31, 2020
Cover [Abstract]  
Entity Registrant Name FB Financial Corp
Amendment Flag false
Entity Central Index Key 0001649749
Document Type 8-K
Document Period End Date Aug. 31, 2020
Entity Incorporation State Country Code TN
Entity File Number 001-37875
Entity Tax Identification Number 62-1216058
Entity Address, Address Line One 211 Commerce Street
Entity Address, Address Line Two Suite 300
Entity Address, City or Town Nashville
Entity Address, State or Province TN
Entity Address, Postal Zip Code 37201
City Area Code (615)
Local Phone Number 564-1212
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Common Stock, $1.00 par value
Trading Symbol FBK
Security Exchange Name NYSE
Entity Emerging Growth Company true
Entity Ex Transition Period true