Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Interest income:
Interest and fees on loans	$ 155,606	$ 140,356
Interest on investment securities
Taxable	9,105	6,570
Tax-exempt	1,442	1,804
Other	9,975	10,750
Total interest income	176,128	159,480
Interest expense:
Deposits	72,625	52,863
Borrowings	4,013	2,957
Total interest expense	76,638	55,820
Net interest income	99,490	103,660
Provision for credit losses on loans HFI	1,852	4,997
Reversal of credit losses on unfunded commitments	(1,070)	(4,506)
Net interest income after provision for credit losses	98,708	103,169
Noninterest income:
(Loss) gain from investment securities, net	(16,213)	69
Gain (loss) on sales or write-downs of other real estate owned and other assets	565	(183)
Other income	1,710	3,550
Total noninterest income	7,962	23,349
Noninterest expenses:
Salaries, commissions and employee benefits	44,618	48,788
Occupancy and equipment expense	6,614	5,909
Data processing	2,408	2,113
Legal and professional fees	1,919	3,108
Advertising	1,171	2,133
Amortization of core deposit and other intangibles	789	990
Other expense	14,901	17,399
Total noninterest expense	72,420	80,440
Income before income taxes	34,250	46,078
Income tax expense	6,300	9,697
Net income applicable to FB Financial Corporation and noncontrolling interest	27,950	36,381
Net income applicable to noncontrolling interest	0	0
Net income applicable to FB Financial Corporation	$ 27,950	$ 36,381
Earnings per common share:
Basic (in dollars per share)	$ 0.60	$ 0.78
Diluted (in dollars per share)	$ 0.59	$ 0.78
Mortgage banking income
Noninterest income:
Mortgage banking income, service charges on deposit accounts, investment services and trust income, ATM and interchange fees	$ 12,585	$ 12,086
Service charges on deposit accounts
Noninterest income:
Mortgage banking income, service charges on deposit accounts, investment services and trust income, ATM and interchange fees	3,141	3,053
Investment services and trust income
Noninterest income:
Mortgage banking income, service charges on deposit accounts, investment services and trust income, ATM and interchange fees	3,230	2,378
ATM and interchange fees
Noninterest income:
Mortgage banking income, service charges on deposit accounts, investment services and trust income, ATM and interchange fees	$ 2,944	$ 2,396