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Stockholders' Equity - Summary of Shares Repurchased Under Stock Purchase Program (Detail)	Sep. 30, 2025 shares
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