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Stockholders' Equity - Summary of Shares Repurchased Under Stock Purchase Program (Detail) - shares	Sep. 30, 2018	Sep. 30, 2017
Summary Of Shares Repurchased Under Stock Purchase Program [Abstract]
Shares remaining to be repurchased	300,000	300,000

X

- 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

X

- 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