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Subsequent Event - Additional Information (Detail) (Subsequent Event [Member], USD $) In Millions, unless otherwise specified	Jan. 24, 2014
Deposits [Member]
Subsequent Event [Line Items]
Assets and liabilities purchased	$ 302.00
Loan [Member]
Subsequent Event [Line Items]
Assets and liabilities purchased	121.00
Securities [Member]
Subsequent Event [Line Items]
Assets and liabilities purchased	4.80
Real Estate [Member]
Subsequent Event [Line Items]
Assets and liabilities purchased	$ 0.01

X

- Definition

Assets And Liabilities Acquisition Cost Purchase Price

+ References

No definition available.

+ Details

Name:	banf_AssetsAndLiabilitiesAcquisitionCostPurchasePrice
Namespace Prefix:	banf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

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