Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Interest income:
Interest and fees on loans	$ 436,363	$ 359,262	$ 294,596
Interest on securities
Taxable	25,469	15,186	10,267
Tax-exempt	7,332	7,657	7,076
Other	12,258	2,893	2,705
Total interest income	481,422	384,998	314,644
Interest expense:
Interest expense on deposits	56,642	30,189	42,859
Interest expense on borrowings	12,545	7,439	6,127
Total interest expense	69,187	37,628	48,986
Net interest income	412,235	347,370	265,658
Provision for credit losses	10,393	(38,995)	94,606
Provision for credit losses on unfunded commitments	8,589	(1,998)	13,361
Net interest income after provisions for credit losses	393,253	388,363	157,691
Noninterest income:
(Loss) gain from securities, net	(376)	324	1,631
(Loss) gain on sales or write-downs of other real estate owned	(114)	2,504	(1,491)
(Loss) gain from other assets	(151)	323	(90)
Other income	5,213	19,047	15,322
Total noninterest income	114,667	228,255	301,855
Noninterest expenses:
Salaries, commissions and employee benefits	211,491	248,318	233,768
Occupancy and equipment expense	23,562	22,733	18,979
Legal and professional fees	15,028	9,161	7,654
Data processing	9,315	9,987	11,390
Merger costs	0	0	34,879
Amortization of core deposit and other intangibles	4,585	5,473	5,323
Advertising	11,208	13,921	10,062
Mortgage restructuring expense	12,458	0	0
Other expense	60,699	63,974	55,030
Total noninterest expense	348,346	373,567	377,085
Income before income taxes	159,574	243,051	82,461
Income tax expense	35,003	52,750	18,832
Net income applicable to FB Financial Corporation and noncontrolling interest	124,571	190,301	63,629
Net income applicable to noncontrolling interest	16	16	8
Net income applicable to FB Financial Corporation	$ 124,555	$ 190,285	$ 63,621
Earnings per common share
Basic (in dollars per share)	$ 2.64	$ 4.01	$ 1.69
Diluted (in dollars per share)	$ 2.64	$ 3.97	$ 1.67
Mortgage banking income
Noninterest income:
Mortgage banking income, service charges on deposit accounts, ATM and interchange fees, investment services and trust income	$ 73,580	$ 167,565	$ 255,328
Service charges on deposit accounts
Noninterest income:
Mortgage banking income, service charges on deposit accounts, ATM and interchange fees, investment services and trust income	12,049	10,034	9,160
ATM and interchange fees
Noninterest income:
Mortgage banking income, service charges on deposit accounts, ATM and interchange fees, investment services and trust income	15,600	19,900	14,915
Investment services and trust income
Noninterest income:
Mortgage banking income, service charges on deposit accounts, ATM and interchange fees, investment services and trust income	$ 8,866	$ 8,558	$ 7,080