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Loans and Allowance for Loan Losses - Transfers from Loans to Other Real Estate Owned and Repossessed Assets (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Financing Receivable Allowance For Credit Loss Additional Information Transfer From Loans To Other Real Estate Owned And Repossessed Assets [Abstract]      
Other real estate owned $ 3,573us-gaap_TransferToOtherRealEstate $ 1,710us-gaap_TransferToOtherRealEstate $ 2,543us-gaap_TransferToOtherRealEstate
Repossessed assets 1,209banf_TransferToRepossessedAssets 1,171banf_TransferToRepossessedAssets 1,034banf_TransferToRepossessedAssets
Total $ 4,782us-gaap_FairValueOfAssetsAcquired $ 2,881us-gaap_FairValueOfAssetsAcquired $ 3,577us-gaap_FairValueOfAssetsAcquired