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Intangible Assets and Goodwill - Summary of Goodwill by Business Segment (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Goodwill [Line Items]    
Balance at beginning of period $ 182,263 $ 182,055
Acquisitions 208
Balance at end of period 182,263 182,263
BancFirst Metropolitan Banks [Member]    
Goodwill [Line Items]    
Balance at beginning of period 13,767 13,767
Balance at end of period 13,767 13,767
BancFirst Community Banks [Member]    
Goodwill [Line Items]    
Balance at beginning of period 61,420 61,212
Acquisitions   208
Balance at end of period 61,420 61,420
Pegasus [Member]    
Goodwill [Line Items]    
Balance at beginning of period 68,855 68,855
Balance at end of period 68,855 68,855
Worthington [Member]    
Goodwill [Line Items]    
Balance at beginning of period 32,133 32,133
Balance at end of period 32,133 32,133
Other Financial Services [Member]    
Goodwill [Line Items]    
Balance at beginning of period 5,464 5,464
Balance at end of period 5,464 5,464
Executive, Operations & Support [Member]    
Goodwill [Line Items]    
Balance at beginning of period 624 624
Balance at end of period $ 624 $ 624