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

X

- Details

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

X

- 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

X

- 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