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Condensed Parent Company Financial Statements- Summary of Income Statement of Parent Company (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
OPERATING INCOME |  |  |  |  |  |  |  |  |  |  |
Interest on interest-bearing deposits |  |  |  |  |  |  |  |  | $ 4,391 us-gaap_InterestIncomeDepositsWithFinancialInstitutions | $ 4,064 us-gaap_InterestIncomeDepositsWithFinancialInstitutions | $ 4,201 us-gaap_InterestIncomeDepositsWithFinancialInstitutions
OPERATING EXPENSE |  |  |  |  |  |  |  |  |  |  |
Other |  |  |  |  |  |  |  |  | 36,407 us-gaap_OtherNoninterestExpense | 32,823 us-gaap_OtherNoninterestExpense | 32,832 us-gaap_OtherNoninterestExpense
Income before taxes |  |  |  |  |  |  |  |  | 91,171 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 80,842 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 79,004 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Allocated income tax benefit |  |  |  |  |  |  |  |  | (27,284)us-gaap_IncomeTaxExpenseBenefit | (26,525)us-gaap_IncomeTaxExpenseBenefit | (27,104)us-gaap_IncomeTaxExpenseBenefit
Amortization of stock-based compensation arrangements of subsidiaries |  |  |  |  |  |  |  |  | (1,676)us-gaap_ShareBasedCompensation | (1,360)us-gaap_ShareBasedCompensation | (1,530)us-gaap_ShareBasedCompensation
Net income | 15,749 us-gaap_NetIncomeLoss | 18,793 us-gaap_NetIncomeLoss | 14,688 us-gaap_NetIncomeLoss | 14,657 us-gaap_NetIncomeLoss | 13,861 us-gaap_NetIncomeLoss | 14,491 us-gaap_NetIncomeLoss | 12,593 us-gaap_NetIncomeLoss | 13,372 us-gaap_NetIncomeLoss | 63,887 us-gaap_NetIncomeLoss | 54,317 us-gaap_NetIncomeLoss | 51,900 us-gaap_NetIncomeLoss
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
OPERATING INCOME |  |  |  |  |  |  |  |  |  |  |
Dividends from subsidiaries |  |  |  |  |  |  |  |  | 24,851 us-gaap_CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 22,612 us-gaap_CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 20,784 us-gaap_CashDividendsPaidToParentCompanyByConsolidatedSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Interest on interest-bearing deposits |  |  |  |  |  |  |  |  | 62 us-gaap_InterestIncomeDepositsWithFinancialInstitutions / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 47 us-gaap_InterestIncomeDepositsWithFinancialInstitutions / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 57 us-gaap_InterestIncomeDepositsWithFinancialInstitutions / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other |  |  |  |  |  |  |  |  | 14 us-gaap_NoninterestIncomeOtherOperatingIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 92 us-gaap_NoninterestIncomeOtherOperatingIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Total operating income |  |  |  |  |  |  |  |  | 24,927 us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 22,751 us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 20,841 us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
OPERATING EXPENSE |  |  |  |  |  |  |  |  |  |  |
Interest |  |  |  |  |  |  |  |  | 1,965 us-gaap_InterestExpenseBorrowings / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,965 us-gaap_InterestExpenseBorrowings / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,134 us-gaap_InterestExpenseBorrowings / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Other |  |  |  |  |  |  |  |  | 667 us-gaap_OtherNoninterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 661 us-gaap_OtherNoninterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 942 us-gaap_OtherNoninterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total operating expense |  |  |  |  |  |  |  |  | 2,632 us-gaap_OperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2,626 us-gaap_OperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3,076 us-gaap_OperatingExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income before taxes |  |  |  |  |  |  |  |  | 22,295 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 20,125 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 17,765 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Allocated income tax benefit |  |  |  |  |  |  |  |  | 472 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 978 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,371 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income before equity in undistributed earnings of subsidiaries |  |  |  |  |  |  |  |  | 22,767 banf_IncomeBeforeEquityInUndistributedEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 21,103 banf_IncomeBeforeEquityInUndistributedEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 19,136 banf_IncomeBeforeEquityInUndistributedEarningsOfSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Equity in undistributed earnings of subsidiaries |  |  |  |  |  |  |  |  | 42,196 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 34,351 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 34,281 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Amortization of stock-based compensation arrangements of subsidiaries |  |  |  |  |  |  |  |  | (1,076)us-gaap_ShareBasedCompensation / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (1,137)us-gaap_ShareBasedCompensation / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (1,517)us-gaap_ShareBasedCompensation / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net income |  |  |  |  |  |  |  |  | $ 63,887 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 54,317 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 51,900 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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