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Intangible Assets and Goodwill - Summary of Goodwill by Business Segment (Detail) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Goodwill [Line Items]    
Balance at beginning and end of period $ 182,263 $ 182,263
BancFirst Metropolitan Banks [Member]    
Goodwill [Line Items]    
Balance at beginning and end of period 13,767  
BancFirst Community Banks [Member]    
Goodwill [Line Items]    
Balance at beginning and end of period 61,420  
Pegasus [Member]    
Goodwill [Line Items]    
Balance at beginning and end of period 68,855  
Worthington [Member]    
Goodwill [Line Items]    
Balance at beginning and end of period 32,133  
Other Financial Services [Member]    
Goodwill [Line Items]    
Balance at beginning and end of period 5,464  
Executive, Operations & Support [Member]    
Goodwill [Line Items]    
Balance at beginning and end of period $ 624