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Stockholders' Equity - Summary of Shares Repurchased Under Stock Purchase Program (Detail) - shares | Sep. 30, 2019 | Sep. 30, 2018
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Summary Of Shares Repurchased Under Stock Purchase Program [Abstract] |  |
Shares remaining to be repurchased | 148,736 | 300,000

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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 The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant