Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Cash flows from operating activities:
Net income attributable to FB Financial Corporation and noncontrolling interest	$ 71,688	$ 54,589
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of fixed assets and software	4,680	4,048
Amortization of core deposit and other intangibles	1,930	2,438
Amortization of issuance costs on subordinated debt	194	193
Capitalization of mortgage servicing rights	(4,061)	(15,070)
Net change in fair value of mortgage servicing rights	5,993	(28,096)
Stock-based compensation expense	5,533	5,620
Provision for credit losses on loans HFI	7,572	2,052
Provision for credit losses on unfunded commitments	(8,159)	6,019
Provision for mortgage loan repurchases	(450)	(1,189)
(Accretion) amortization of discounts and premiums on acquired loans, net	(305)	2,288
Amortization of premiums and accretion of discounts on securities, net	2,691	3,692
(Gain) loss from securities, net	(41)	261
Originations of loans held for sale	(641,962)	(1,719,488)
Proceeds from sale of loans held for sale	679,456	2,213,443
Gain on sale and change in fair value of loans held for sale	(17,495)	(35,410)
Net (gain) loss on write-downs of other real estate owned and other assets	(350)	442
Provision for deferred income taxes	2,629	12,461
Earnings on bank-owned life insurance	(983)	(728)
Changes in:
Operating lease assets and liabilities, net	1,033	166
Other assets and interest receivable	(2,727)	13,566
Accrued expenses and other liabilities	(250)	7,279
Net cash provided by operating activities	106,616	528,576
Activity in available-for-sale securities:
Sales	0	1,218
Maturities, prepayments and calls	58,415	126,349
Purchases	(905)	(243,209)
Net change in loans	(15,832)	(990,402)
Sales of FHLB stock	26,368	0
Purchases of FHLB stock	(7,993)	(2,364)
Purchases of premises and equipment	(12,576)	(3,224)
Proceeds from the sale of premises and equipment	0	875
Proceeds from the sale of other real estate owned	5,155	418
Proceeds from the sale of other assets	775	0
Proceeds from bank-owned life insurance	236	0
Net cash provided by (used in) investing activities	53,643	(1,110,339)
Cash flows from financing activities:
Net increase (decrease) in deposits	15,489	(287,478)
Net increase (decrease) in securities sold under agreements to repurchase and federal funds    purchased	29,275	(9,010)
Net decrease in short-term FHLB advances	(50,000)	0
Share based compensation withholding payments	(2,921)	(2,146)
Net proceeds from sale of common stock under employee stock purchase program	321	687
Repurchase of common stock	(4,944)	(32,743)
Dividends paid on common stock	(14,011)	(12,304)
Dividend equivalent payments made upon vesting of equity compensation	(158)	(114)
Noncontrolling interest distribution	(8)	(8)
Net cash used in financing activities	(26,957)	(343,116)
Net change in cash and cash equivalents	133,302	(924,879)
Cash and cash equivalents at beginning of the period	1,027,052	1,797,740
Cash and cash equivalents at end of the period	1,160,354	872,861
Supplemental cash flow information:
Interest paid	116,211	15,638
Taxes paid, net	29,338	726
Supplemental noncash disclosures:
Transfers from loans to other real estate owned	593	563
Transfers from loans to other assets	1,391	0
Loans provided for sales of other assets	424	0
Transfers from loans to loans held for sale	10,545	20,016
Transfers from loans held for sale to loans	2,755	14,179
Decrease in rebooked GNMA loans under optional repurchase program	(5,986)	0
Dividends declared not paid on restricted stock units	158	118
Right-of-use assets obtained in exchange for operating lease liabilities	$ 3,477	$ 2,317