Consolidated Statements of Comprehensive (Loss) Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 36,381	$ 35,236
Other comprehensive income (loss), net of tax:
Net unrealized gain (loss) in available-for-sale securities, net of tax expenses (benefits) of $7,059 and $(27,483)	20,064	(78,175)
Reclassification adjustment for gain on sale of securities included in net income, net of tax expenses of $— and $1	0	(1)
Net unrealized (loss) gain in hedging activities, net of tax (benefits) expenses of $(70) and $273	(197)	774
Total other comprehensive income (loss), net of tax	19,867	(77,402)
Comprehensive income (loss) applicable to FB Financial Corporation and noncontrolling interest	56,248	(42,166)
Comprehensive income applicable to noncontrolling interest	0	0
Comprehensive income (loss) applicable to FB Financial Corporation	$ 56,248	$ (42,166)