v3.25.2
Segment Reporting - Schedule of Segment Financial Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Segment Reporting Information [Line Items]          
Interest income $ 182,084 $ 177,413 $ 361,790 $ 353,541  
Interest expense 70,669 74,798 142,734 151,436  
Net interest income 111,415 102,615 219,056 202,105  
Provisions for (reversals of) credit losses 5,337 2,224 7,629 3,006  
Net interest income (loss) after provision for credit losses 106,078 100,391 211,427 199,099  
Mortgage banking income 17,260 16,246 32,755 31,872  
Change in fair value of mortgage servicing rights, net of hedging (4,231) (4,336) (7,300) (7,377)  
Other noninterest (loss) income (47,581) 13,698 (36,975) 9,075  
Total noninterest (loss) income (34,552) 25,608 (11,520) 33,570  
Salaries, commissions and employee benefits 46,631 46,225 94,982 90,843  
Merger and integration costs 2,734 0 3,135 0  
Depreciation and amortization 2,868 2,861 5,635 5,702  
Amortization of intangibles 631 752 1,287 1,541  
Other noninterest expense 28,397 25,255 55,771 49,427  
Total noninterest expense 81,261 75,093 160,810 147,513  
Loss before income taxes (9,735) 50,906 39,097 85,156  
Income tax (benefit) expense (12,652) 10,919 (3,181) 17,219  
Net income applicable to FB Financial Corporation and noncontrolling interest 2,917 39,987 42,278 67,937  
Net income applicable to noncontrolling interest 8 8 8 8  
Net income applicable to FB Financial Corporation 2,909 39,979 42,270 67,929  
Total assets 13,354,238 12,535,169 13,354,238 12,535,169 $ 13,157,482
Goodwill 242,561 242,561 242,561 242,561 $ 242,561
Banking          
Segment Reporting Information [Line Items]          
Interest income 180,960 177,570 359,875 353,990  
Interest expense 72,051 76,377 145,207 154,335  
Net interest income 108,909 101,193 214,668 199,655  
Provisions for (reversals of) credit losses 582 2,432 2,771 3,270  
Net interest income (loss) after provision for credit losses 108,327 98,761 211,897 196,385  
Mortgage banking income 0 0 0 0  
Change in fair value of mortgage servicing rights, net of hedging 0 0 0 0  
Other noninterest (loss) income (47,720) 13,477 (37,060) 8,683  
Total noninterest (loss) income (47,720) 13,477 (37,060) 8,683  
Salaries, commissions and employee benefits 38,635 38,793 80,104 76,583  
Merger and integration costs 2,734   3,135    
Depreciation and amortization 2,849 2,745 5,592 5,453  
Amortization of intangibles 631 752 1,287 1,541  
Other noninterest expense 22,481 19,888 44,121 38,795  
Total noninterest expense 67,330 62,178 134,239 122,372  
Loss before income taxes (6,723) 50,060 40,598 82,696  
Total assets 12,736,830 11,947,550 12,736,830 11,947,550  
Goodwill 242,561 242,561 242,561 242,561  
Mortgage          
Segment Reporting Information [Line Items]          
Interest income 1,124 (157) 1,915 (449)  
Interest expense (1,382) (1,579) (2,473) (2,899)  
Net interest income 2,506 1,422 4,388 2,450  
Provisions for (reversals of) credit losses 4,755 (208) 4,858 (264)  
Net interest income (loss) after provision for credit losses (2,249) 1,630 (470) 2,714  
Mortgage banking income 17,260 16,246 32,755 31,872  
Change in fair value of mortgage servicing rights, net of hedging (4,231) (4,336) (7,300) (7,377)  
Other noninterest (loss) income 139 221 85 392  
Total noninterest (loss) income 13,168 12,131 25,540 24,887  
Salaries, commissions and employee benefits 7,996 7,432 14,878 14,260  
Merger and integration costs 0   0    
Depreciation and amortization 19 116 43 249  
Amortization of intangibles 0 0 0 0  
Other noninterest expense 5,916 5,367 11,650 10,632  
Total noninterest expense 13,931 12,915 26,571 25,141  
Loss before income taxes (3,012) 846 (1,501) 2,460  
Total assets 617,408 587,619 617,408 587,619  
Goodwill $ 0 $ 0 $ 0 $ 0