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Stockholders' Equity - Summary of Shares Repurchased Under Stock Purchase Program (Detail) | Sep. 30, 2025 shares
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Summary Of Shares Repurchased Under Stock Purchase Program [Abstract] |
Shares remaining to be repurchased | 479,784

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- Definition Summary of shares repurchased under stock purchase program. + References No definition available. + Details
Name: | banf_SummaryOfSharesRepurchasedUnderStockPurchaseProgramAbstract
Namespace Prefix: | banf_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of shares remaining authorized to be purchased under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant