Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 27,950	$ 36,381
Other comprehensive income, net of tax:
Net unrealized (loss) gain in available-for-sale securities, net of tax (benefit) expense of $(3,432) and $7,059	(9,573)	20,064
Reclassification adjustment for loss on sale of securities included in net income, net of tax benefit of $4,225 and $—	11,988	0
Net unrealized loss in hedging activities, net of tax benefit of $62 and $70	(174)	(197)
Total other comprehensive income, net of tax	2,241	19,867
Comprehensive income applicable to FB Financial Corporation and noncontrolling interest	30,191	56,248
Comprehensive income applicable to noncontrolling interest	0	0
Comprehensive income applicable to FB Financial Corporation	$ 30,191	$ 56,248