XML 84 R98.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Stock - Based Compensation - Summary of Accumulated Stock Units (Detail) (USD $) | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |  |
Accumulated stock units | 56,380 | 55,390
Average price | $ 35.31 | $ 33.98

X
- Definition Deferred Compensation Arrangement With Individual Accumulated Stock Units For Deferred Board Fees + References No definition available. + Details
Name: | banf_DeferredCompensationArrangementWithIndividualAccumulatedStockUnitsForDeferredBoardFees
Namespace Prefix: | banf_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Deferred Compensation Arrangement With Individual Stock Average Price + References No definition available. + Details
Name: | banf_DeferredCompensationArrangementWithIndividualStockAveragePrice
Namespace Prefix: | banf_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration