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Segment Information - Results of Operations and Selected Financial Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Segment Reporting Information [Line Items]          
Interest income $ 194,393 $ 187,650 $ 565,296 $ 537,758  
Interest expense 68,778 72,693 202,476 206,801  
Total provision for/(benefit from) credit losses 4,438 3,031 7,411 10,404  
Noninterest income 49,866 48,712 146,808 137,556  
Depreciation and amortization 5,587 5,368 16,834 16,201  
Other noninterest expense 86,485 81,366 255,616 238,628  
Income before taxes 78,971 73,904 229,767 203,280  
Capital expenditures     36,763 21,508  
Loans held for investment 8,278,247 8,180,361 8,278,247 8,180,361 $ 8,025,110
Total assets 14,198,140 13,313,482 14,198,140 13,313,482 13,554,314
Deposits 12,118,387 11,474,352 12,118,387 11,474,352 $ 11,718,546
Operating Segments [Member] | BancFirst Metropolitan Banks [Member]          
Segment Reporting Information [Line Items]          
Interest income 50,791 55,275 149,462 159,079  
Interest expense 20,212 25,061 60,679 71,533  
Total provision for/(benefit from) credit losses 1,299 798 1,732 2,503  
Noninterest income 6,347 5,692 18,870 16,423  
Depreciation and amortization 468 518 1,334 1,601  
Other noninterest expense 11,858 11,164 35,359 32,899  
Income before taxes 23,301 23,426 69,228 66,966  
Capital expenditures     4,100 3,421  
Loans held for investment 2,562,711 2,624,448 2,562,711 2,624,448  
Total assets 3,567,836 3,484,436 3,567,836 3,484,436  
Deposits 2,899,907 2,679,414 2,899,907 2,679,414  
Operating Segments [Member] | BancFirst Community Banks [Member]          
Segment Reporting Information [Line Items]          
Interest income 111,871 106,966 326,952 308,459  
Interest expense 41,069 43,267 120,633 123,039  
Total provision for/(benefit from) credit losses 2,075 791 3,532 3,283  
Noninterest income 18,418 17,787 54,845 50,591  
Depreciation and amortization 2,672 2,453 7,952 7,374  
Other noninterest expense 36,548 34,748 107,086 100,801  
Income before taxes 47,925 43,494 142,594 124,553  
Capital expenditures     11,622 7,535  
Loans held for investment 4,145,827 4,046,879 4,145,827 4,046,879  
Total assets 8,102,009 7,672,481 8,102,009 7,672,481  
Deposits 7,465,883 7,062,544 7,465,883 7,062,544  
Operating Segments [Member] | Pegasus [Member]          
Segment Reporting Information [Line Items]          
Interest income 21,634 21,331 61,737 59,728  
Interest expense 8,282 8,482 23,168 24,649  
Total provision for/(benefit from) credit losses 370 530 586 3,390  
Noninterest income 457 394 1,633 1,053  
Depreciation and amortization 118 150 413 482  
Other noninterest expense 5,626 5,375 16,851 15,815  
Income before taxes 7,695 7,188 22,352 16,445  
Capital expenditures     1,268 383  
Loans held for investment 927,560 870,081 927,560 870,081  
Total assets 1,607,512 1,506,885 1,607,512 1,506,885  
Deposits 1,360,582 1,295,341 1,360,582 1,295,341  
Operating Segments [Member] | Worthington [Member]          
Segment Reporting Information [Line Items]          
Interest income 9,108 8,252 26,764 23,594  
Interest expense 2,673 3,577 8,864 10,068  
Total provision for/(benefit from) credit losses 41 (15) 384 174  
Noninterest income (66) 238 399 709  
Depreciation and amortization 166 159 495 479  
Other noninterest expense 3,625 3,496 11,138 10,896  
Income before taxes 2,537 1,273 6,282 2,686  
Capital expenditures     134 4,720  
Loans held for investment 483,611 442,417 483,611 442,417  
Total assets 642,205 627,105 642,205 627,105  
Deposits 550,622 540,390 550,622 540,390  
Operating Segments [Member] | Other Financial Services [Member]          
Segment Reporting Information [Line Items]          
Interest income 2,568 2,593 7,582 7,265  
Interest expense 1,039 1,229 2,997 3,779  
Total provision for/(benefit from) credit losses 401 3 412 71  
Noninterest income 16,951 16,241 47,784 44,917  
Depreciation and amortization 137 121 406 366  
Other noninterest expense 10,867 10,694 34,828 30,705  
Income before taxes 7,075 6,787 16,723 17,261  
Capital expenditures     1,088 196  
Loans held for investment 100,805 98,355 100,805 98,355  
Total assets 15,696 93,819 15,696 93,819  
Executive, Operations, Support and Eliminations [Member]          
Segment Reporting Information [Line Items]          
Interest income (1,579) (6,767) (7,201) (20,367)  
Interest expense (4,497) (8,923) (13,865) (26,267)  
Total provision for/(benefit from) credit losses 252 924 765 983  
Noninterest income 7,759 8,360 23,277 23,863  
Depreciation and amortization 2,026 1,967 6,234 5,899  
Other noninterest expense 17,961 15,889 50,354 47,512  
Income before taxes (9,562) (8,264) (27,412) (24,631)  
Capital expenditures     18,551 5,253  
Loans held for investment 57,733 98,181 57,733 98,181  
Total assets 262,882 (71,244) 262,882 (71,244)  
Deposits $ (158,607) $ (103,337) $ (158,607) $ (103,337)