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Fair Value Measurements (Details 2) (USD $) In Thousands, unless otherwise specified | 9 Months Ended
--- | ---
Sep. 30, 2012 | Sep. 30, 2011
Impaired Loans [Member] |  |
Assets measured at fair value on a nonrecurring basis |  |
Assets measured at fair value on a nonrecurring basis | $ 43,206 | $ 25,694
Foreclosed Assets [Member] |  |
Assets measured at fair value on a nonrecurring basis |  |
Assets measured at fair value on a nonrecurring basis | 237 | 501
Gains (Losses) | (84) |
Other Real Estate Owned [Member] |  |
Assets measured at fair value on a nonrecurring basis |  |
Assets measured at fair value on a nonrecurring basis | 9,559 | 16,222
Gains (Losses) | (1,226) | (562)
Level 1 Inputs [Member] | Impaired Loans [Member] |  |
Assets measured at fair value on a nonrecurring basis |  |
Assets measured at fair value on a nonrecurring basis |  |
Level 1 Inputs [Member] | Foreclosed Assets [Member] |  |
Assets measured at fair value on a nonrecurring basis |  |
Assets measured at fair value on a nonrecurring basis |  |
Level 1 Inputs [Member] | Other Real Estate Owned [Member] |  |
Assets measured at fair value on a nonrecurring basis |  |
Assets measured at fair value on a nonrecurring basis |  |
Level 2 Inputs [Member] | Impaired Loans [Member] |  |
Assets measured at fair value on a nonrecurring basis |  |
Assets measured at fair value on a nonrecurring basis |  |
Level 2 Inputs [Member] | Foreclosed Assets [Member] |  |
Assets measured at fair value on a nonrecurring basis |  |
Assets measured at fair value on a nonrecurring basis |  |
Level 2 Inputs [Member] | Other Real Estate Owned [Member] |  |
Assets measured at fair value on a nonrecurring basis |  |
Assets measured at fair value on a nonrecurring basis |  |
Level 3 Inputs [Member] | Impaired Loans [Member] |  |
Assets measured at fair value on a nonrecurring basis |  |
Assets measured at fair value on a nonrecurring basis | 43,206 | 25,694
Level 3 Inputs [Member] | Foreclosed Assets [Member] |  |
Assets measured at fair value on a nonrecurring basis |  |
Assets measured at fair value on a nonrecurring basis | 237 | 501
Level 3 Inputs [Member] | Other Real Estate Owned [Member] |  |
Assets measured at fair value on a nonrecurring basis |  |
Assets measured at fair value on a nonrecurring basis | $ 9,559 | $ 16,222

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- Definition Fair value, assets measured on non recurring basis, gains or losses. + References No definition available. + Details
Name: | banf_GainsLosses
Namespace Prefix: | banf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
Name: | us-gaap_AssetsFairValueDisclosureNonrecurring
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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