Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Statement of Comprehensive Income [Abstract]
Net income	$ 39,361	$ 27,950
Other comprehensive income, net of tax:
Net unrealized gain (loss) in available-for-sale securities, net of tax expense (benefit) of $3,489 and $(3,432)	9,743	(9,573)
Reclassification adjustment for (gain) loss on securities included in net income, net of tax (expense) benefit of $(4) and $4,225	(12)	11,988
Net unrealized loss in hedging activities, net of tax benefit of $62	0	(174)
Total other comprehensive income, net of tax	9,731	2,241
Comprehensive income applicable to FB Financial Corporation and noncontrolling interest	49,092	30,191
Comprehensive income applicable to noncontrolling interest	0	0
Comprehensive income applicable to FB Financial Corporation	$ 49,092	$ 30,191