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Retirement Plans - Aggregate Amounts of Contributions to the 401(k) and ESOP Plans (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Total contributions	$ 3,558	$ 3,393	$ 3,163
401(k) contributions [Member]
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Aggregate amounts of contributions	1,738	1,690	1,534
ESOP contributions [Member]
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Aggregate amounts of contributions	$ 1,820	$ 1,703	$ 1,629

X

- Definition

Aggregate Contribution By Employer

+ References

No definition available.

+ Details

Name:	banf_AggregateContributionByEmployer
Namespace Prefix:	banf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration