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Stock-Based Compensation - Summary of Accumulated Stock Units (Detail) - $ / shares | Sep. 30, 2025 | Dec. 31, 2024
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Share-Based Payment Arrangement [Abstract] |  |
Accumulated stock units | 120,610 | 120,984
Average price | $ 49.32 | $ 44.7

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- Definition Deferred compensation arrangement with individual accumulated stock units For deferred board fees. + References No definition available. + Details
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Namespace Prefix: | banf_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition Deferred compensation arrangement with individual stock average price. + References No definition available. + Details
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Namespace Prefix: | banf_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration