Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Interest income:
Interest and fees on loans	$ 209,307	$ 158,625	$ 522,189	$ 469,610
Interest on investment securities
Taxable	14,395	13,943	43,527	35,014
Tax-exempt	1,058	1,104	3,127	3,714
Other	12,138	11,956	29,845	30,831
Total interest income	236,898	185,628	598,688	539,169
Interest expense:
Deposits	86,577	76,088	225,394	220,214
Borrowings	3,081	3,523	6,998	10,833
Total interest expense	89,658	79,611	232,392	231,047
Net interest income	147,240	106,017	366,296	308,122
Provision for credit losses on loans HFI	29,957	1,856	30,761	7,648
Provision for (reversal of) credit losses on unfunded commitments	4,460	58	11,285	(2,728)
Net interest income after provision for credit losses	112,823	104,103	324,250	303,202
Noninterest income:
Gain (loss) from investment securities, net	12	(40,165)	(60,521)	(56,378)
Loss on sales or write-downs of premises and equipment, other real estate owned and other assets, net	(646)	(289)	(1,035)	(5)
Other income	2,121	2,465	6,009	8,786
Total noninterest income (loss)	26,635	(16,497)	15,115	17,073
Noninterest expenses:
Salaries, commissions and employee benefits	59,210	47,538	154,192	138,381
Merger and integration costs	16,057	0	19,192	0
Occupancy and equipment expense	7,539	6,640	20,846	19,582
Data processing	2,457	2,486	6,931	7,180
Advertising	2,453	1,947	7,118	4,977
Amortization of core deposit and other intangibles	2,079	719	3,366	2,260
Legal and professional fees	1,227	1,900	5,645	5,798
Other expense	18,834	14,982	53,376	45,547
Total noninterest expense	109,856	76,212	270,666	223,725
Income before income taxes	29,602	11,394	68,699	96,550
Income tax expense	6,227	1,174	3,046	18,393
Net income applicable to FB Financial Corporation and noncontrolling interest	23,375	10,220	65,653	78,157
Net income applicable to noncontrolling interest	0	0	8	8
Net income applicable to FB Financial Corporation	$ 23,375	$ 10,220	$ 65,645	$ 78,149
Earnings per common share:
Basic (in dollars per share)	$ 0.44	$ 0.22	$ 1.35	$ 1.67
Diluted (in dollars per share)	$ 0.43	$ 0.22	$ 1.34	$ 1.67
Mortgage banking income
Noninterest income:
Mortgage banking income, investment services and trust income, service charges on deposit accounts, ATM and interchange fees	$ 13,484	$ 11,553	$ 38,939	$ 36,048
Investment services and trust income
Noninterest income:
Mortgage banking income, investment services and trust income, service charges on deposit accounts, ATM and interchange fees	4,227	3,721	11,860	10,338
Service charges on deposit accounts
Noninterest income:
Mortgage banking income, investment services and trust income, service charges on deposit accounts, ATM and interchange fees	4,049	3,378	10,920	9,686
ATM and interchange fees
Noninterest income:
Mortgage banking income, investment services and trust income, service charges on deposit accounts, ATM and interchange fees	$ 3,388	$ 2,840	$ 8,943	$ 8,598