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Intangible Assets and Goodwill (Details Textual)	12 Months Ended
	Dec. 31, 2012
Intangible Assets and Goodwill (Textual) [Abstract]
Weighted-average life	7 years
Core deposit intangibles [Member]
Intangible Assets and Goodwill (Textual) [Abstract]
Weighted-average life	6 years
Customer relationship intangibles [Member]
Intangible Assets and Goodwill (Textual) [Abstract]
Weighted-average life	11 years 1 month 6 days
Mortgage Servicing Intangibles [Member]
Intangible Assets and Goodwill (Textual) [Abstract]
Weighted-average life	2 years 8 months 12 days

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- Details

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Namespace Prefix:	banf_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration