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Loans and Allowance for Loan Losses - Summary of Nonperforming and Restructured Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Summary Of Nonperforming And Restructured Assets [Abstract]      
Past due 90 days or more and still accruing $ 1,498us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing $ 1,135us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing $ 910us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
Nonaccrual 16,562us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus 16,410us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus 17,753us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Restructured 16,131us-gaap_FinancingReceivableModificationsRecordedInvestment 16,515us-gaap_FinancingReceivableModificationsRecordedInvestment 17,468us-gaap_FinancingReceivableModificationsRecordedInvestment
Total nonperforming and restructured loans 34,191banf_FinancingReceivableRecordedInvestmentNonperformingAndRestructuredLoans 34,060banf_FinancingReceivableRecordedInvestmentNonperformingAndRestructuredLoans 36,131banf_FinancingReceivableRecordedInvestmentNonperformingAndRestructuredLoans
Other real estate owned and repossessed assets 6,418us-gaap_OtherRealEstateAndForeclosedAssets 8,079us-gaap_OtherRealEstateAndForeclosedAssets 7,590us-gaap_OtherRealEstateAndForeclosedAssets
Total nonperforming and restructured assets $ 40,609banf_FinancingReceivableRecordedInvestmentNonperformingAndRestructuredAssets $ 42,139banf_FinancingReceivableRecordedInvestmentNonperformingAndRestructuredAssets $ 43,721banf_FinancingReceivableRecordedInvestmentNonperformingAndRestructuredAssets
Nonperforming and restructured loans to total loans 0.89%us-gaap_LoansAndLeasesReceivableRatioOfNonperformingLoansToAllLoans 0.88%us-gaap_LoansAndLeasesReceivableRatioOfNonperformingLoansToAllLoans 1.02%us-gaap_LoansAndLeasesReceivableRatioOfNonperformingLoansToAllLoans
Nonperforming and restructured assets to total assets 0.62%banf_NonperformingAndRestructuredAssetsToAssets 0.64%banf_NonperformingAndRestructuredAssetsToAssets 0.69%banf_NonperformingAndRestructuredAssetsToAssets