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Stock - Based Compensation - Summary of Accumulated Stock Units (Detail) - $ / shares	Sep. 30, 2018	Dec. 31, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Accumulated stock units	140,946	138,768
Average price	$ 24.36	$ 22.84

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- Definition

Deferred compensation arrangement with individual accumulated stock units For deferred board fees.

+ References

No definition available.

+ Details

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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

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- Definition

Deferred compensation arrangement with individual stock average price.

+ References

No definition available.

+ Details

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Namespace Prefix:	banf_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

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- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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