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Segment Information - Results of Operations and Selected Financial Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information [Line Items]      
Interest income $ 724,139 $ 623,936 $ 419,820
Interest expense 277,265 199,480 46,147
Provision for/(benefit from) credit losses 9,004 7,458 10,076
Noninterest income 184,575 185,408 183,747
Depreciation and amortization 21,681 22,189 22,048
Other noninterest expense 325,483 310,269 287,864
Income before taxes 275,281 269,948 237,432
Loans held for investment 8,025,110 7,656,645 6,943,563
Total assets 13,554,314 12,372,042 12,387,863
Total deposits 11,718,546 10,700,122 10,974,228
Capital expenditures 36,652 22,504 19,785
Operating Segments [Member] | BancFirst Metropolitan Banks [Member]      
Segment Reporting Information [Line Items]      
Interest income 211,451 196,270 113,223
Interest expense 94,400 76,044 15,495
Provision for/(benefit from) credit losses (620) 4,836 2,186
Noninterest income 22,278 24,793 32,756
Depreciation and amortization 1,701 2,347 2,821
Other noninterest expense 44,692 46,329 42,583
Income before taxes 93,556 91,507 82,894
Loans held for investment 2,436,878 2,495,337 2,003,806
Total assets 3,540,092 3,598,888 3,412,369
Total deposits 2,841,106 2,741,628 2,866,437
Capital expenditures 5,353 2,752 2,026
Operating Segments [Member] | BancFirst Community Banks [Member]      
Segment Reporting Information [Line Items]      
Interest income 414,594 342,528 233,310
Interest expense 164,974 113,332 24,582
Provision for/(benefit from) credit losses 4,300 2,331 2,451
Noninterest income 68,349 70,824 72,385
Depreciation and amortization 10,324 10,514 10,453
Other noninterest expense 135,215 123,554 117,248
Income before taxes 168,130 163,621 150,961
Loans held for investment 4,069,972 3,756,022 3,526,397
Total assets 7,810,502 7,012,905 6,886,066
Total deposits 7,197,541 6,435,161 6,348,566
Capital expenditures 11,852 5,156 10,146
Operating Segments [Member] | Pegasus [Member]      
Segment Reporting Information [Line Items]      
Interest income 80,540 74,932 51,228
Interest expense 32,473 23,655 4,789
Provision for/(benefit from) credit losses 3,690 (328) 2,840
Noninterest income 1,481 1,646 1,026
Depreciation and amortization 631 804 789
Other noninterest expense 21,676 20,084 19,013
Income before taxes 23,551 32,363 24,823
Loans held for investment 886,760 803,290 888,693
Total assets 1,417,873 1,280,618 1,404,033
Total deposits 1,203,172 1,084,077 1,231,932
Capital expenditures 397 528 311
Operating Segments [Member] | Worthington [Member]      
Segment Reporting Information [Line Items]      
Interest income 32,237 25,374 15,880
Interest expense 13,466 7,979 961
Provision for/(benefit from) credit losses 286 564 (43)
Noninterest income 961 1,170 1,034
Depreciation and amortization 646 496 398
Other noninterest expense 14,561 13,636 9,280
Income before taxes 4,239 3,869 6,318
Loans held for investment 453,584 418,719 334,917
Total assets 644,928 600,364 541,002
Total deposits 558,641 499,462 465,975
Capital expenditures 4,889 5,497 262
Operating Segments [Member] | Other Financial Services [Member]      
Segment Reporting Information [Line Items]      
Interest income 9,780 8,954 8,931
Interest expense 4,845 4,790 866
Provision for/(benefit from) credit losses 344 79 (161)
Noninterest income 59,804 52,711 50,643
Depreciation and amortization 490 481 519
Other noninterest expense 41,396 37,495 36,271
Income before taxes 22,509 18,820 22,079
Loans held for investment 94,432 103,441 97,444
Total assets 135,783 121,601 171,679
Total deposits (14,547) (26,781) 23,606
Capital expenditures 4,355 108 67
Operating Segments [Member] | Executive, Operations & Support [Member]      
Segment Reporting Information [Line Items]      
Interest income (19,386) (21,198) (2,606)
Interest expense (27,790) (23,396) (380)
Provision for/(benefit from) credit losses 1,004 (24) 2,803
Noninterest income 253,333 250,968 223,844
Depreciation and amortization 7,889 7,547 7,068
Other noninterest expense 68,992 70,293 64,325
Income before taxes 183,852 175,350 147,422
Loans held for investment 83,484 99,836 92,306
Total assets 1,682,433 1,307,714 1,473,443
Total deposits 62,074 66,526 68,872
Capital expenditures 9,806 8,463 6,973
Eliminations [Member]      
Segment Reporting Information [Line Items]      
Interest income (5,077) (2,924) (146)
Interest expense (5,103) (2,924) (166)
Noninterest income (221,631) (216,704) (197,941)
Other noninterest expense (1,049) (1,122) (856)
Income before taxes (220,556) (215,582) (197,065)
Loans held for investment   (20,000)  
Total assets (1,677,297) (1,550,048) (1,500,729)
Total deposits $ (129,441) $ (99,951) $ (31,160)