Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Statement of Comprehensive Income [Abstract]
Net income	$ 23,375	$ 10,220	$ 65,653	$ 78,157
Other comprehensive income, net of tax:
Net unrealized gain in available-for-sale securities, net of tax expense of $1,839, $9,621, $6,518 and $6,674	5,533	27,265	18,448	18,597
Reclassification adjustment for loss on securities included in net income, net of tax benefit of $—, $10,467, $15,775 and $14,692	0	29,698	44,758	41,686
Net unrealized loss in hedging activities, net of tax benefit of $— , $21, $— and $151	0	(59)	0	(428)
Total other comprehensive income, net of tax	5,533	56,904	63,206	59,855
Comprehensive income applicable to FB Financial Corporation and noncontrolling interest	28,908	67,124	128,859	138,012
Comprehensive income applicable to noncontrolling interest	0	0	8	8
Comprehensive income applicable to FB Financial Corporation	$ 28,908	$ 67,124	$ 128,851	$ 138,004