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Loans and Allowance for Loan Losses - ALLL for Impaired Loans with Specific Reserves (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
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Receivables [Abstract] |  |  |
Allowance for loss on impaired loans | $ 1,559 banf_ImpairedFinancingLoanWithSpecificReserveRelatedAllowance | $ 1,578 banf_ImpairedFinancingLoanWithSpecificReserveRelatedAllowance | $ 2,170 banf_ImpairedFinancingLoanWithSpecificReserveRelatedAllowance
Recorded balance of impaired loans | 3,673 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment | 5,283 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment | 6,185 us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
Average recorded investment | $ 4,478 banf_ImpairedFinancingReceivableAverageRecordedValueOfInvestment | $ 5,734 banf_ImpairedFinancingReceivableAverageRecordedValueOfInvestment | $ 8,416 banf_ImpairedFinancingReceivableAverageRecordedValueOfInvestment

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- Definition Impaired financing loan with specific reserve related allowance. + References No definition available. + Details
Name: | banf_ImpairedFinancingLoanWithSpecificReserveRelatedAllowance
Namespace Prefix: | banf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Impaired financing receivable average recorded value of investment. + References No definition available. + Details
Name: | banf_ImpairedFinancingReceivableAverageRecordedValueOfInvestment
Namespace Prefix: | banf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of investment in impaired financing receivables for which there is a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953550-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_ReceivablesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration