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Loans and Allowance for Loan Losses - Schedule of Loans Outstanding by Category (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014
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Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | $ 3,857,742 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount | $ 3,860,831 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount | $ 3,542,270 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Loans held for sale (included above) | 11,103 us-gaap_LoansHeldForSaleFairValueDisclosure | 9,433 us-gaap_LoansHeldForSaleFairValueDisclosure | 5,231 us-gaap_LoansHeldForSaleFairValueDisclosure
Percent | 100.00%banf_LoansPercent | 100.00%banf_LoansPercent | 100.00%banf_LoansPercent
Taxable [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 18,055 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banf_TaxableMunicipalLoanMember | 20,431 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banf_TaxableMunicipalLoanMember | 9,824 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banf_TaxableMunicipalLoanMember
Percent | 0.47%banf_LoansPercent / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banf_TaxableMunicipalLoanMember | 0.53%banf_LoansPercent / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banf_TaxableMunicipalLoanMember | 0.28%banf_LoansPercent / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banf_TaxableMunicipalLoanMember
Tax-exempt [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 25,374 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banf_NontaxableMunicipalLoanMember | 20,952 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banf_NontaxableMunicipalLoanMember | 11,219 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banf_NontaxableMunicipalLoanMember
Percent | 0.66%banf_LoansPercent / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banf_NontaxableMunicipalLoanMember | 0.54%banf_LoansPercent / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banf_NontaxableMunicipalLoanMember | 0.32%banf_LoansPercent / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banf_NontaxableMunicipalLoanMember
Commercial and Industrial [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 747,470 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = banf_CommercialAndIndustrialMember | 745,106 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = banf_CommercialAndIndustrialMember | 676,084 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = banf_CommercialAndIndustrialMember
Percent | 19.38%banf_LoansPercent / us-gaap_FinancialInstrumentAxis = banf_CommercialAndIndustrialMember | 19.30%banf_LoansPercent / us-gaap_FinancialInstrumentAxis = banf_CommercialAndIndustrialMember | 19.09%banf_LoansPercent / us-gaap_FinancialInstrumentAxis = banf_CommercialAndIndustrialMember
Oil & Gas Production And Equipment [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 102,342 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = banf_OilGasProductionAndEquipmentMember | 104,940 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = banf_OilGasProductionAndEquipmentMember | 99,382 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = banf_OilGasProductionAndEquipmentMember
Percent | 2.65%banf_LoansPercent / us-gaap_FinancialInstrumentAxis = banf_OilGasProductionAndEquipmentMember | 2.72%banf_LoansPercent / us-gaap_FinancialInstrumentAxis = banf_OilGasProductionAndEquipmentMember | 2.80%banf_LoansPercent / us-gaap_FinancialInstrumentAxis = banf_OilGasProductionAndEquipmentMember
Agriculture [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 122,186 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = banf_AgricultureMember | 132,830 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = banf_AgricultureMember | 109,570 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = banf_AgricultureMember
Percent | 3.17%banf_LoansPercent / us-gaap_FinancialInstrumentAxis = banf_AgricultureMember | 3.44%banf_LoansPercent / us-gaap_FinancialInstrumentAxis = banf_AgricultureMember | 3.09%banf_LoansPercent / us-gaap_FinancialInstrumentAxis = banf_AgricultureMember
Construction [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 361,976 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = banf_ConstructionMember | 356,621 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = banf_ConstructionMember | 299,238 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = banf_ConstructionMember
Percent | 9.38%banf_LoansPercent / us-gaap_FinancialInstrumentAxis = banf_ConstructionMember | 9.24%banf_LoansPercent / us-gaap_FinancialInstrumentAxis = banf_ConstructionMember | 8.45%banf_LoansPercent / us-gaap_FinancialInstrumentAxis = banf_ConstructionMember
Farmland [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 145,494 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = banf_FarmlandMember | 149,507 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = banf_FarmlandMember | 141,059 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = banf_FarmlandMember
Percent | 3.77%banf_LoansPercent / us-gaap_FinancialInstrumentAxis = banf_FarmlandMember | 3.87%banf_LoansPercent / us-gaap_FinancialInstrumentAxis = banf_FarmlandMember | 3.98%banf_LoansPercent / us-gaap_FinancialInstrumentAxis = banf_FarmlandMember
One to Four Family Residences [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 783,810 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = banf_OneToFourFamilyResidencesMember | 775,795 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = banf_OneToFourFamilyResidencesMember | 723,358 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = banf_OneToFourFamilyResidencesMember
Percent | 20.32%banf_LoansPercent / us-gaap_FinancialInstrumentAxis = banf_OneToFourFamilyResidencesMember | 20.09%banf_LoansPercent / us-gaap_FinancialInstrumentAxis = banf_OneToFourFamilyResidencesMember | 20.42%banf_LoansPercent / us-gaap_FinancialInstrumentAxis = banf_OneToFourFamilyResidencesMember
Multifamily Residential Properties [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 66,851 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = banf_MultifamilyResidentialPropertiesMember | 66,766 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = banf_MultifamilyResidentialPropertiesMember | 60,785 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = banf_MultifamilyResidentialPropertiesMember
Percent | 1.73%banf_LoansPercent / us-gaap_FinancialInstrumentAxis = banf_MultifamilyResidentialPropertiesMember | 1.73%banf_LoansPercent / us-gaap_FinancialInstrumentAxis = banf_MultifamilyResidentialPropertiesMember | 1.72%banf_LoansPercent / us-gaap_FinancialInstrumentAxis = banf_MultifamilyResidentialPropertiesMember
Commercial [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 1,192,581 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember | 1,191,477 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember | 1,134,384 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember
Percent | 30.91%banf_LoansPercent / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember | 30.86%banf_LoansPercent / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember | 32.02%banf_LoansPercent / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember
Consumer [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | 259,644 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember | 267,179 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember | 251,651 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember
Percent | 6.73%banf_LoansPercent / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember | 6.92%banf_LoansPercent / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember | 7.10%banf_LoansPercent / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember
Other (Not Classified Above) [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans | $ 31,959 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = banf_OtherNotClassifiedAboveMember | $ 29,227 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = banf_OtherNotClassifiedAboveMember | $ 25,716 us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = banf_OtherNotClassifiedAboveMember
Percent | 0.83%banf_LoansPercent / us-gaap_FinancialInstrumentAxis = banf_OtherNotClassifiedAboveMember | 0.76%banf_LoansPercent / us-gaap_FinancialInstrumentAxis = banf_OtherNotClassifiedAboveMember | 0.73%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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