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Intangible Assets and Goodwill (Details Textual) | 12 Months Ended
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Dec. 31, 2012
Intangible Assets and Goodwill (Textual) [Abstract] |
Weighted-average life | 7 years
Core deposit intangibles [Member] |
Intangible Assets and Goodwill (Textual) [Abstract] |
Weighted-average life | 6 years
Customer relationship intangibles [Member] |
Intangible Assets and Goodwill (Textual) [Abstract] |
Weighted-average life | 11 years 1 month 6 days
Mortgage Servicing Intangibles [Member] |
Intangible Assets and Goodwill (Textual) [Abstract] |
Weighted-average life | 2 years 8 months 12 days

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- Details
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Namespace Prefix: | banf_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration