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Retirement Plans (Details Textual) | 12 Months Ended
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Dec. 31, 2012 Plans
Retirement Plans (Textual) [Abstract] |
Maximum legal limit of employee contribution to plan | 3.00%
Employer's contribution, percent of employee contribution | 50.00%
Number of retirement plans | 2

X
- Definition Number of retirement plans. + References No definition available. + Details
Name: | banf_NumberOfRetirementPlans
Namespace Prefix: | banf_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | banf_RetirementPlansTextualAbstract
Namespace Prefix: | banf_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum percentage of employee gross pay, by the terms of the plan, that the employer may contribute to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanMaximumAnnualContributionPerEmployeePercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration