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Loans and Allowance for Loan Losses - Schedule of Loans Outstanding by Category (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | $ 3,860,831 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount | $ 3,387,146 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Loans held for sale (included above) | 9,433 us-gaap_LoansHeldForSaleFairValueDisclosure | 6,469 us-gaap_LoansHeldForSaleFairValueDisclosure
Percent | 100.00%banf_LoansPercent | 100.00%banf_LoansPercent
Taxable [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 20,431 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banf_TaxableMunicipalLoanMember | 10,217 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banf_TaxableMunicipalLoanMember
Percent | 0.53%banf_LoansPercent / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banf_TaxableMunicipalLoanMember | 0.30%banf_LoansPercent / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banf_TaxableMunicipalLoanMember
Tax-exempt [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 20,952 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banf_NontaxableMunicipalLoanMember | 11,073 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banf_NontaxableMunicipalLoanMember
Percent | 0.54%banf_LoansPercent / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banf_NontaxableMunicipalLoanMember | 0.33%banf_LoansPercent / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banf_NontaxableMunicipalLoanMember
Commercial and Industrial [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 745,106 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = banf_CommercialAndIndustrialMember | 605,672 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = banf_CommercialAndIndustrialMember
Percent | 19.30%banf_LoansPercent / us-gaap_FinancialInstrumentAxis = banf_CommercialAndIndustrialMember | 17.88%banf_LoansPercent / us-gaap_FinancialInstrumentAxis = banf_CommercialAndIndustrialMember
Oil & Gas Production And Equipment [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 104,940 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = banf_OilGasProductionAndEquipmentMember | 96,907 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = banf_OilGasProductionAndEquipmentMember
Percent | 2.72%banf_LoansPercent / us-gaap_FinancialInstrumentAxis = banf_OilGasProductionAndEquipmentMember | 2.86%banf_LoansPercent / us-gaap_FinancialInstrumentAxis = banf_OilGasProductionAndEquipmentMember
Agriculture [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 132,830 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = banf_AgricultureMember | 111,323 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = banf_AgricultureMember
Percent | 3.44%banf_LoansPercent / us-gaap_FinancialInstrumentAxis = banf_AgricultureMember | 3.29%banf_LoansPercent / us-gaap_FinancialInstrumentAxis = banf_AgricultureMember
Construction [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 356,621 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = banf_ConstructionMember | 284,808 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = banf_ConstructionMember
Percent | 9.24%banf_LoansPercent / us-gaap_FinancialInstrumentAxis = banf_ConstructionMember | 8.41%banf_LoansPercent / us-gaap_FinancialInstrumentAxis = banf_ConstructionMember
Farmland [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 149,507 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = banf_FarmlandMember | 132,512 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = banf_FarmlandMember
Percent | 3.87%banf_LoansPercent / us-gaap_FinancialInstrumentAxis = banf_FarmlandMember | 3.91%banf_LoansPercent / us-gaap_FinancialInstrumentAxis = banf_FarmlandMember
One to Four Family Residences [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 775,795 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = banf_OneToFourFamilyResidencesMember | 703,903 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = banf_OneToFourFamilyResidencesMember
Percent | 20.09%banf_LoansPercent / us-gaap_FinancialInstrumentAxis = banf_OneToFourFamilyResidencesMember | 20.78%banf_LoansPercent / us-gaap_FinancialInstrumentAxis = banf_OneToFourFamilyResidencesMember
Multifamily Residential Properties [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 66,766 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = banf_MultifamilyResidentialPropertiesMember | 60,080 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = banf_MultifamilyResidentialPropertiesMember
Percent | 1.73%banf_LoansPercent / us-gaap_FinancialInstrumentAxis = banf_MultifamilyResidentialPropertiesMember | 1.77%banf_LoansPercent / us-gaap_FinancialInstrumentAxis = banf_MultifamilyResidentialPropertiesMember
Commercial [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 1,191,477 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember | 1,097,484 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember
Percent | 30.86%banf_LoansPercent / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember | 32.40%banf_LoansPercent / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember
Consumer [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | 267,179 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember | 250,588 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember
Percent | 6.92%banf_LoansPercent / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember | 7.40%banf_LoansPercent / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember
Other (Not Classified Above) [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Total loans | $ 29,227 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = banf_OtherNotClassifiedAboveMember | $ 22,579 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = banf_OtherNotClassifiedAboveMember
Percent | 0.76%banf_LoansPercent / us-gaap_FinancialInstrumentAxis = banf_OtherNotClassifiedAboveMember | 0.67%banf_LoansPercent / us-gaap_FinancialInstrumentAxis = banf_OtherNotClassifiedAboveMember

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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 + Details
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