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Fair Value Measurements - Additional Information (Detail) (USD $)	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Debt Instrument Fair Value Disclosure [Abstract]
Loan held for sale selling period	30 days
Transfer of securities between levels of fair value hierarchy	$ 0	$ 0
Amount of non-financial assets (liabilities)	0	0
Non-financial assets or liabilities for which no impairment was provided	$ 0	$ 0

X

- 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

X

- Definition

Non Financial Assets Liabilities For Which No Impairment Provided

+ References

No definition available.

+ Details

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

X

- 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

X

- Details

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

X

- Definition

Amount of transfers of financial instrument classified as a liability into (out of) level 3 of the fair value hierarchy.

+ References

No definition available.

+ Details

Name:	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityTransfersNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration