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Intangible Assets and Goodwill - Summary of Goodwill by Business Segment (Detail)
$ in Thousands
Sep. 30, 2024
USD ($)
Goodwill [Line Items]  
Balance at beginning of period $ 182,263
Balance at beginning and end of period 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