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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, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Segment Reporting Information [Line Items]          
Net interest income $ 114,957 $ 104,308 $ 330,957 $ 319,390  
Noninterest income 48,712 44,449 137,556 140,251  
Income before taxes 73,904 65,230 203,280 209,541  
Total assets 13,313,482   13,313,482   $ 12,372,042
Operating Segments [Member] | BancFirst Metropolitan Banks [Member]          
Segment Reporting Information [Line Items]          
Net interest income 30,214 30,258 87,546 90,266  
Noninterest income 5,692 5,533 16,423 18,710  
Income before taxes 23,426 22,043 66,966 66,941  
Total assets 3,484,436   3,484,436   3,598,888
Operating Segments [Member] | BancFirst Community Banks [Member]          
Segment Reporting Information [Line Items]          
Net interest income 63,699 56,644 185,420 171,946  
Noninterest income 17,787 15,986 50,591 55,504  
Income before taxes 43,494 38,985 124,553 125,768  
Total assets 7,672,481   7,672,481   7,012,905
Operating Segments [Member] | Pegasus [Member]          
Segment Reporting Information [Line Items]          
Net interest income 12,849 11,334 35,079 39,994  
Noninterest income 394 561 1,053 1,242  
Income before taxes 7,188 6,559 16,445 26,060  
Total assets 1,506,885   1,506,885   1,280,618
Operating Segments [Member] | Worthington [Member]          
Segment Reporting Information [Line Items]          
Net interest income 4,675 4,160 13,526 12,907  
Noninterest income 238 301 709 835  
Income before taxes 1,273 693 2,686 3,114  
Total assets 627,105   627,105   600,364
Operating Segments [Member] | Other Financial Services [Member]          
Segment Reporting Information [Line Items]          
Net interest income 1,364 1,063 3,486 3,063  
Noninterest income 16,241 14,542 44,917 41,064  
Income before taxes 6,787 5,541 17,261 16,003  
Total assets 93,819   93,819   121,601
Operating Segments [Member] | Executive, Operations & Support [Member]          
Segment Reporting Information [Line Items]          
Net interest income 2,156 849 5,900 1,214  
Noninterest income 67,087 59,923 183,579 189,754  
Income before taxes 49,880 43,282 134,176 137,624  
Total assets 1,567,000   1,567,000   1,307,714
Eliminations [Member]          
Segment Reporting Information [Line Items]          
Noninterest income (58,727) (52,397) (159,716) (166,858)  
Income before taxes (58,144) $ (51,873) (158,807) $ (165,969)  
Total assets $ (1,638,244)   $ (1,638,244)   $ (1,550,048)