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Fair Value Measurements (Details 2) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011
Impaired loans (less specific allowance) [Member] |  |
Assets measured at fair value on a nonrecurring basis |  |
Total Fair Value | $ 40,681 | $ 18,173
Foreclosed assets [Member] |  |
Assets measured at fair value on a nonrecurring basis |  |
Total Fair Value | 339 | 531
Gains (Losses) | (118) | (98)
Other real estate owned [Member] |  |
Assets measured at fair value on a nonrecurring basis |  |
Total Fair Value | 9,227 | 16,109
Gains (Losses) | (1,328) | (617)
Level 1 Inputs [Member] | Impaired loans (less specific allowance) [Member] |  |
Assets measured at fair value on a nonrecurring basis |  |
Total Fair Value |  |
Level 1 Inputs [Member] | Foreclosed assets [Member] |  |
Assets measured at fair value on a nonrecurring basis |  |
Total Fair Value |  |
Level 1 Inputs [Member] | Other real estate owned [Member] |  |
Assets measured at fair value on a nonrecurring basis |  |
Total Fair Value |  |
Level 2 Inputs [Member] | Impaired loans (less specific allowance) [Member] |  |
Assets measured at fair value on a nonrecurring basis |  |
Total Fair Value |  |
Level 2 Inputs [Member] | Foreclosed assets [Member] |  |
Assets measured at fair value on a nonrecurring basis |  |
Total Fair Value |  |
Level 2 Inputs [Member] | Other real estate owned [Member] |  |
Assets measured at fair value on a nonrecurring basis |  |
Total Fair Value |  |
Level 3 Inputs [Member] | Impaired loans (less specific allowance) [Member] |  |
Assets measured at fair value on a nonrecurring basis |  |
Total Fair Value | 40,681 | 18,173
Level 3 Inputs [Member] | Foreclosed assets [Member] |  |
Assets measured at fair value on a nonrecurring basis |  |
Total Fair Value | 339 | 531
Level 3 Inputs [Member] | Other real estate owned [Member] |  |
Assets measured at fair value on a nonrecurring basis |  |
Total Fair Value | $ 9,227 | $ 16,109

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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