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Loans and Allowance for Loan Losses - Loans Outstanding by Impairment Methodology (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | $ 76,758 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment | $ 58,244 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
Collectively evaluated for impairment | 3,765,852 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment | 3,322,228 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
Loans acquired with deteriorated credit quality | 18,221 us-gaap_FinancingReceivableAcquiredWithDeterioratedCreditQuality | 6,674 us-gaap_FinancingReceivableAcquiredWithDeterioratedCreditQuality
Non-residential Real Estate Owner Occupied [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 5,374 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = banf_NonResidentialRealEstateOwnerOccupiedMember | 6,095 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = banf_NonResidentialRealEstateOwnerOccupiedMember
Collectively evaluated for impairment | 478,261 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = banf_NonResidentialRealEstateOwnerOccupiedMember | 448,937 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = banf_NonResidentialRealEstateOwnerOccupiedMember
Non-residential Real Estate Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 25,251 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = banf_NonResidentialRealEstateOtherMember | 26,684 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = banf_NonResidentialRealEstateOtherMember
Collectively evaluated for impairment | 928,752 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = banf_NonResidentialRealEstateOtherMember | 836,698 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = banf_NonResidentialRealEstateOtherMember
Residential Real Estate Permanent Mortgage [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 7,313 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = banf_ResidentialRealEstatePermanentMortgageMember | 7,174 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = banf_ResidentialRealEstatePermanentMortgageMember
Collectively evaluated for impairment | 300,266 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = banf_ResidentialRealEstatePermanentMortgageMember | 258,806 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = banf_ResidentialRealEstatePermanentMortgageMember
Residential Real Estate All Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 8,319 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = banf_ResidentialRealEstateAllOtherMember | 9,881 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = banf_ResidentialRealEstateAllOtherMember
Collectively evaluated for impairment | 628,769 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = banf_ResidentialRealEstateAllOtherMember | 557,992 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = banf_ResidentialRealEstateAllOtherMember
Non-consumer Non-real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 28,156 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = banf_NonConsumerNonRealEstateMember | 5,731 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = banf_NonConsumerNonRealEstateMember
Collectively evaluated for impairment | 938,551 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = banf_NonConsumerNonRealEstateMember | 789,584 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = banf_NonConsumerNonRealEstateMember
Consumer Non-real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 2,112 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = banf_ConsumerNonRealEstateMember | 2,362 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = banf_ConsumerNonRealEstateMember
Collectively evaluated for impairment | 245,653 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = banf_ConsumerNonRealEstateMember | 225,972 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = banf_ConsumerNonRealEstateMember
Other Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 233 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = banf_OtherLoansMember | 317 us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = banf_OtherLoansMember
Collectively evaluated for impairment | 162,184 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = banf_OtherLoansMember | 145,039 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = banf_OtherLoansMember
Acquired Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Collectively evaluated for impairment | 83,416 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = banf_AcquiredLoansMember | 59,200 us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment / us-gaap_FinancialInstrumentAxis = banf_AcquiredLoansMember
Loans acquired with deteriorated credit quality | $ 18,221 us-gaap_FinancingReceivableAcquiredWithDeterioratedCreditQuality / us-gaap_FinancialInstrumentAxis = banf_AcquiredLoansMember | $ 6,674 us-gaap_FinancingReceivableAcquiredWithDeterioratedCreditQuality / us-gaap_FinancialInstrumentAxis = banf_AcquiredLoansMember

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