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Loans and Allowance for Loan Losses - Summary of Amounts Included in Nonaccrual Loans Segregated by Class of Loans (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans, Total	$ 16,562us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus	$ 16,410us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus	$ 17,753us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Non-residential Real Estate Owner Occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans, Total	408us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancialInstrumentAxis = banf_NonResidentialRealEstateOwnerOccupiedMember		448us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancialInstrumentAxis = banf_NonResidentialRealEstateOwnerOccupiedMember
Non-residential Real Estate Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans, Total	5,113us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancialInstrumentAxis = banf_NonResidentialRealEstateOtherMember		5,779us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancialInstrumentAxis = banf_NonResidentialRealEstateOtherMember
Residential Real Estate Permanent Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans, Total	641us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancialInstrumentAxis = banf_ResidentialRealEstatePermanentMortgageMember		689us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancialInstrumentAxis = banf_ResidentialRealEstatePermanentMortgageMember
Residential Real Estate All Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans, Total	1,730us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancialInstrumentAxis = banf_ResidentialRealEstateAllOtherMember		958us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancialInstrumentAxis = banf_ResidentialRealEstateAllOtherMember
Non-consumer Non-real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans, Total	2,215us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancialInstrumentAxis = banf_NonConsumerNonRealEstateMember		1,287us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancialInstrumentAxis = banf_NonConsumerNonRealEstateMember
Consumer Non-real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans, Total	177us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancialInstrumentAxis = banf_ConsumerNonRealEstateMember		165us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancialInstrumentAxis = banf_ConsumerNonRealEstateMember
Other Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans, Total	1,752us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancialInstrumentAxis = banf_OtherLoansMember		1,198us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancialInstrumentAxis = banf_OtherLoansMember
Acquired Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans, Total	$ 4,526us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancialInstrumentAxis = banf_AcquiredLoansMember		$ 7,229us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_FinancialInstrumentAxis = banf_AcquiredLoansMember

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- Definition

Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 7

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5111-111524

+ Details

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