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Fair Value Measurements (Details Textual) (USD $) | 12 Months Ended
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Dec. 31, 2012
Fair Value Measurements (Textual) [Abstract] |
Loan held for sale selling period | 30 days
Amount of non-financial assets (liabilities) | $ 0
Non-financial assets or liabilities for which no impairment was provided | $ 0

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- Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Mortgage loans selling period. + References No definition available. + Details
Name: | banf_MortgageLoansSellingPeriod
Namespace Prefix: | banf_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Non financial assets liabilities for which no impairment provided. + References No definition available. + Details
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Namespace Prefix: | banf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Non financial assets liabilities value. + References No definition available. + Details
Name: | banf_NonFinancialAssetsLiabilitiesValue
Namespace Prefix: | banf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration