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Commitments and Contingent Liabilities (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
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Summary of financial instruments with off-balance-sheet risks |  |
Loan commitments | $ 855,820 | $ 718,191
Stand-by letters of credit | $ 58,629 | $ 55,804

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

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- Definition Stand by letters of credit. + References No definition available. + Details
Name: | banf_StandByLettersOfCredit
Namespace Prefix: | banf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Unfunded loan commitments. + References No definition available. + Details
Name: | banf_UnfundedLoanCommitments
Namespace Prefix: | banf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant