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Loans and Allowance for Loan Losses - Impaired Loans Segregated by Class of Loans (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Principal Balance	$ 41,000us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance	$ 51,195us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
Recorded Investment with Allowance	34,963us-gaap_ImpairedFinancingReceivableRecordedInvestment	41,833us-gaap_ImpairedFinancingReceivableRecordedInvestment
Related Allowance	2,499us-gaap_ImpairedFinancingReceivableRelatedAllowance	3,026us-gaap_ImpairedFinancingReceivableRelatedAllowance
Average Recorded Investment	35,754us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment	38,853us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
Non-residential Real Estate Owner Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Principal Balance	574us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_FinancialInstrumentAxis = banf_NonResidentialRealEstateOwnerOccupiedMember	688us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_FinancialInstrumentAxis = banf_NonResidentialRealEstateOwnerOccupiedMember
Recorded Investment with Allowance	499us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FinancialInstrumentAxis = banf_NonResidentialRealEstateOwnerOccupiedMember	601us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FinancialInstrumentAxis = banf_NonResidentialRealEstateOwnerOccupiedMember
Related Allowance	18us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_FinancialInstrumentAxis = banf_NonResidentialRealEstateOwnerOccupiedMember	29us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_FinancialInstrumentAxis = banf_NonResidentialRealEstateOwnerOccupiedMember
Average Recorded Investment	516us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_FinancialInstrumentAxis = banf_NonResidentialRealEstateOwnerOccupiedMember	642us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_FinancialInstrumentAxis = banf_NonResidentialRealEstateOwnerOccupiedMember
Non-residential Real Estate Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Principal Balance	22,834us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_FinancialInstrumentAxis = banf_NonResidentialRealEstateOtherMember	24,355us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_FinancialInstrumentAxis = banf_NonResidentialRealEstateOtherMember
Recorded Investment with Allowance	20,784us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FinancialInstrumentAxis = banf_NonResidentialRealEstateOtherMember	22,680us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FinancialInstrumentAxis = banf_NonResidentialRealEstateOtherMember
Related Allowance	1,338us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_FinancialInstrumentAxis = banf_NonResidentialRealEstateOtherMember	1,734us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_FinancialInstrumentAxis = banf_NonResidentialRealEstateOtherMember
Average Recorded Investment	21,133us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_FinancialInstrumentAxis = banf_NonResidentialRealEstateOtherMember	22,915us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_FinancialInstrumentAxis = banf_NonResidentialRealEstateOtherMember
Residential Real Estate Permanent Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Principal Balance	1,034us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_FinancialInstrumentAxis = banf_ResidentialRealEstatePermanentMortgageMember	1,068us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_FinancialInstrumentAxis = banf_ResidentialRealEstatePermanentMortgageMember
Recorded Investment with Allowance	803us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FinancialInstrumentAxis = banf_ResidentialRealEstatePermanentMortgageMember	836us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FinancialInstrumentAxis = banf_ResidentialRealEstatePermanentMortgageMember
Related Allowance	60us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_FinancialInstrumentAxis = banf_ResidentialRealEstatePermanentMortgageMember	88us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_FinancialInstrumentAxis = banf_ResidentialRealEstatePermanentMortgageMember
Average Recorded Investment	916us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_FinancialInstrumentAxis = banf_ResidentialRealEstatePermanentMortgageMember	918us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_FinancialInstrumentAxis = banf_ResidentialRealEstatePermanentMortgageMember
Residential Real Estate All Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Principal Balance	2,503us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_FinancialInstrumentAxis = banf_ResidentialRealEstateAllOtherMember	1,318us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_FinancialInstrumentAxis = banf_ResidentialRealEstateAllOtherMember
Recorded Investment with Allowance	2,279us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FinancialInstrumentAxis = banf_ResidentialRealEstateAllOtherMember	1,139us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FinancialInstrumentAxis = banf_ResidentialRealEstateAllOtherMember
Related Allowance	313us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_FinancialInstrumentAxis = banf_ResidentialRealEstateAllOtherMember	218us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_FinancialInstrumentAxis = banf_ResidentialRealEstateAllOtherMember
Average Recorded Investment	2,393us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_FinancialInstrumentAxis = banf_ResidentialRealEstateAllOtherMember	1,335us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_FinancialInstrumentAxis = banf_ResidentialRealEstateAllOtherMember
Non-consumer Non-real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Principal Balance	2,797us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_FinancialInstrumentAxis = banf_NonConsumerNonRealEstateMember	1,824us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_FinancialInstrumentAxis = banf_NonConsumerNonRealEstateMember
Recorded Investment with Allowance	2,465us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FinancialInstrumentAxis = banf_NonConsumerNonRealEstateMember	1,491us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FinancialInstrumentAxis = banf_NonConsumerNonRealEstateMember
Related Allowance	614us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_FinancialInstrumentAxis = banf_NonConsumerNonRealEstateMember	427us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_FinancialInstrumentAxis = banf_NonConsumerNonRealEstateMember
Average Recorded Investment	2,129us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_FinancialInstrumentAxis = banf_NonConsumerNonRealEstateMember	1,449us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_FinancialInstrumentAxis = banf_NonConsumerNonRealEstateMember
Consumer Non-real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Principal Balance	566us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_FinancialInstrumentAxis = banf_ConsumerNonRealEstateMember	548us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_FinancialInstrumentAxis = banf_ConsumerNonRealEstateMember
Recorded Investment with Allowance	553us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FinancialInstrumentAxis = banf_ConsumerNonRealEstateMember	527us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FinancialInstrumentAxis = banf_ConsumerNonRealEstateMember
Related Allowance	107us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_FinancialInstrumentAxis = banf_ConsumerNonRealEstateMember	134us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_FinancialInstrumentAxis = banf_ConsumerNonRealEstateMember
Average Recorded Investment	582us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_FinancialInstrumentAxis = banf_ConsumerNonRealEstateMember	572us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_FinancialInstrumentAxis = banf_ConsumerNonRealEstateMember
Other Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Principal Balance	2,204us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_FinancialInstrumentAxis = banf_OtherLoansMember	1,215us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_FinancialInstrumentAxis = banf_OtherLoansMember
Recorded Investment with Allowance	2,105us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FinancialInstrumentAxis = banf_OtherLoansMember	1,198us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FinancialInstrumentAxis = banf_OtherLoansMember
Related Allowance	49us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_FinancialInstrumentAxis = banf_OtherLoansMember	207us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_FinancialInstrumentAxis = banf_OtherLoansMember
Average Recorded Investment	2,322us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_FinancialInstrumentAxis = banf_OtherLoansMember	1,278us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_FinancialInstrumentAxis = banf_OtherLoansMember
Acquired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Principal Balance	8,488us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_FinancialInstrumentAxis = banf_AcquiredLoansMember	20,179us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance / us-gaap_FinancialInstrumentAxis = banf_AcquiredLoansMember
Recorded Investment with Allowance	5,475us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FinancialInstrumentAxis = banf_AcquiredLoansMember	13,361us-gaap_ImpairedFinancingReceivableRecordedInvestment / us-gaap_FinancialInstrumentAxis = banf_AcquiredLoansMember
Related Allowance		189us-gaap_ImpairedFinancingReceivableRelatedAllowance / us-gaap_FinancialInstrumentAxis = banf_AcquiredLoansMember
Average Recorded Investment	$ 5,763us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_FinancialInstrumentAxis = banf_AcquiredLoansMember	$ 9,744us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_FinancialInstrumentAxis = banf_AcquiredLoansMember

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Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524



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-Section 50

-Paragraph 17

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-Publisher FASB

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-Section 50

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Amount of allowance for credit losses related to recorded investment.

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

-Publisher FASB

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Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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-Paragraph 15

-Subparagraph (a)(4)

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