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Stock-Based Compensation (Details 5) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Summary of the accumulated stock units
Accumulated stock units	55,390	51,190
Average price	$ 33.98	$ 33.21

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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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- 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
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- Details

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