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Fair Value Measurements (Details 2) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Impaired loans (less specific allowance) [Member] |  |
Assets measured at fair value on a nonrecurring basis |  |
Total Fair Value | $ 40,852 | $ 46,243
Foreclosed assets [Member] |  |
Assets measured at fair value on a nonrecurring basis |  |
Total Fair Value | 326 | 403
Gains (Losses) | 13 | (1)
Other real estate owned [Member] |  |
Assets measured at fair value on a nonrecurring basis |  |
Total Fair Value | 9,098 | 12,005
Gains (Losses) | (87) | (154)
Level 1 [Member] | Impaired loans (less specific allowance) [Member] |  |
Assets measured at fair value on a nonrecurring basis |  |
Total Fair Value |  |
Level 1 [Member] | Foreclosed assets [Member] |  |
Assets measured at fair value on a nonrecurring basis |  |
Total Fair Value |  |
Level 1 [Member] | Other real estate owned [Member] |  |
Assets measured at fair value on a nonrecurring basis |  |
Total Fair Value |  |
Level 2 [Member] | Impaired loans (less specific allowance) [Member] |  |
Assets measured at fair value on a nonrecurring basis |  |
Total Fair Value |  |
Level 2 [Member] | Foreclosed assets [Member] |  |
Assets measured at fair value on a nonrecurring basis |  |
Total Fair Value |  |
Level 2 [Member] | Other real estate owned [Member] |  |
Assets measured at fair value on a nonrecurring basis |  |
Total Fair Value |  |
Level 3 [Member] | Impaired loans (less specific allowance) [Member] |  |
Assets measured at fair value on a nonrecurring basis |  |
Total Fair Value | 40,852 | 46,243
Level 3 [Member] | Foreclosed assets [Member] |  |
Assets measured at fair value on a nonrecurring basis |  |
Total Fair Value | 326 | 403
Level 3 [Member] | Other real estate owned [Member] |  |
Assets measured at fair value on a nonrecurring basis |  |
Total Fair Value | $ 9,098 | $ 12,005

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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