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Subsequent Event - Additional Information (Detail) (Subsequent Event [Member], USD $) In Millions, unless otherwise specified | Jan. 24, 2014
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Deposits [Member] |
Subsequent Event [Line Items] |
Assets and liabilities purchased | $ 302.00
Loan [Member] |
Subsequent Event [Line Items] |
Assets and liabilities purchased | 121.00
Securities [Member] |
Subsequent Event [Line Items] |
Assets and liabilities purchased | 4.80
Real Estate [Member] |
Subsequent Event [Line Items] |
Assets and liabilities purchased | $ 0.01

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- Definition Assets And Liabilities Acquisition Cost Purchase Price + References No definition available. + Details
Name: | banf_AssetsAndLiabilitiesAcquisitionCostPurchasePrice
Namespace Prefix: | banf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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