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Intangible Assets and Goodwill - Summary of Goodwill by Business Segment (Detail) $ in Thousands | Sep. 30, 2024 USD ($)
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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

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