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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
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	$ 3,857,742us-gaap_LoansAndLeasesReceivableGrossCarryingAmount	$ 3,860,831us-gaap_LoansAndLeasesReceivableGrossCarryingAmount	$ 3,542,270us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Loans held for sale (included above)	11,103us-gaap_LoansHeldForSaleFairValueDisclosure	9,433us-gaap_LoansHeldForSaleFairValueDisclosure	5,231us-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	18,055us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banf_TaxableMunicipalLoanMember	20,431us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banf_TaxableMunicipalLoanMember	9,824us-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	25,374us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banf_NontaxableMunicipalLoanMember	20,952us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = banf_NontaxableMunicipalLoanMember	11,219us-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	747,470us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = banf_CommercialAndIndustrialMember	745,106us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = banf_CommercialAndIndustrialMember	676,084us-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	102,342us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = banf_OilGasProductionAndEquipmentMember	104,940us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = banf_OilGasProductionAndEquipmentMember	99,382us-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	122,186us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = banf_AgricultureMember	132,830us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = banf_AgricultureMember	109,570us-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	361,976us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = banf_ConstructionMember	356,621us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = banf_ConstructionMember	299,238us-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	145,494us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = banf_FarmlandMember	149,507us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = banf_FarmlandMember	141,059us-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	783,810us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = banf_OneToFourFamilyResidencesMember	775,795us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = banf_OneToFourFamilyResidencesMember	723,358us-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	66,851us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = banf_MultifamilyResidentialPropertiesMember	66,766us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = banf_MultifamilyResidentialPropertiesMember	60,785us-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	1,192,581us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember	1,191,477us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_CommercialLoanMember	1,134,384us-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	259,644us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember	267,179us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = us-gaap_ConsumerLoanMember	251,651us-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	$ 31,959us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = banf_OtherNotClassifiedAboveMember	$ 29,227us-gaap_LoansAndLeasesReceivableGrossCarryingAmount / us-gaap_FinancialInstrumentAxis = banf_OtherNotClassifiedAboveMember	$ 25,716us-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

Loans percent.

+ References

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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

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- Definition

Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

+ References

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