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Fair Value Measurements - Additional Information (Detail) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2024	Dec. 31, 2023
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Days from origination after which mortgage loans are sold	30 days
Amount of non-financial assets (liabilities) measured at fair value on a recurring basis	$ 0	$ 0
Non-financial assets for which no impairment was provided	$ 0	$ 0

X

- Definition

Non financial assets liabilities for which no impairment provided.

+ References

No definition available.

+ Details

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Namespace Prefix:	banf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of non-financial assets (liabilities) measured at fair value on a recurring basis.

+ References

No definition available.

+ Details

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Namespace Prefix:	banf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Period for sale of mortgage loan from origination.

+ References

No definition available.

+ Details

Name:	banf_PeriodForSaleOfMortgageLoanFromOrigination
Namespace Prefix:	banf_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration