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Loans and Allowance for Loan Losses - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015 SecurityLoan	Mar. 31, 2014
Receivables [Abstract]
Percentage of loans secured by real estate	65.00%banf_PercentageOfLoansSecuredByRealEstate
Interest income recognized	$ 310,000us-gaap_LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans	$ 227,000us-gaap_LoansAndLeasesReceivableImpairedInterestLostOnNonaccrualLoans
Troubled debt restructuring principal deferral	1us-gaap_FinancingReceivableModificationsNumberOfContracts2

X

- Definition

Percentage of loans secured by real estate.

+ References

No definition available.

+ Details

Name:	banf_PercentageOfLoansSecuredByRealEstate
Namespace Prefix:	banf_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 33

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953676-111524

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Reflects the amount of additional interest income that would have been recorded if impaired or nonperforming loans were instead current, in compliance with their original terms, and outstanding throughout the reporting period or since origination (if held for part of the period).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 40

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18794-111554

+ Details

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

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- Details

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