XML 77 R99.htm IDEA: XBRL DOCUMENT v2.4.0.6

Retirement Plans (Details Textual)	12 Months Ended
	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