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Consolidated Statements of Comprehensive Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
INTEREST INCOME      
Loans, including fees $ 182,972us-gaap_InterestAndFeeIncomeLoansAndLeases $ 167,051us-gaap_InterestAndFeeIncomeLoansAndLeases $ 169,143us-gaap_InterestAndFeeIncomeLoansAndLeases
Securities:      
Taxable 5,727us-gaap_InterestIncomeSecuritiesTaxable 4,947us-gaap_InterestIncomeSecuritiesTaxable 7,686us-gaap_InterestIncomeSecuritiesTaxable
Tax-exempt 1,061us-gaap_InterestIncomeSecuritiesTaxExempt 1,222us-gaap_InterestIncomeSecuritiesTaxExempt 1,555us-gaap_InterestIncomeSecuritiesTaxExempt
Federal funds sold 2us-gaap_InterestIncomeFederalFundsSold 2us-gaap_InterestIncomeFederalFundsSold 2us-gaap_InterestIncomeFederalFundsSold
Interest-bearing deposits with banks 4,391us-gaap_InterestIncomeDepositsWithFinancialInstitutions 4,064us-gaap_InterestIncomeDepositsWithFinancialInstitutions 4,201us-gaap_InterestIncomeDepositsWithFinancialInstitutions
Total interest income 194,153us-gaap_InterestAndDividendIncomeOperating 177,286us-gaap_InterestAndDividendIncomeOperating 182,587us-gaap_InterestAndDividendIncomeOperating
INTEREST EXPENSE      
Deposits 10,795us-gaap_InterestExpenseDeposits 11,579us-gaap_InterestExpenseDeposits 15,250us-gaap_InterestExpenseDeposits
Short-term borrowings 16us-gaap_InterestExpenseShortTermBorrowings 6us-gaap_InterestExpenseShortTermBorrowings 28us-gaap_InterestExpenseShortTermBorrowings
Long-term borrowings 25us-gaap_InterestExpenseLongTermDebt 216us-gaap_InterestExpenseLongTermDebt 360us-gaap_InterestExpenseLongTermDebt
Junior subordinated debentures 1,966us-gaap_InterestExpenseJuniorSubordinatedDebentures 1,966us-gaap_InterestExpenseJuniorSubordinatedDebentures 2,134us-gaap_InterestExpenseJuniorSubordinatedDebentures
Total interest expense 12,802us-gaap_InterestExpense 13,767us-gaap_InterestExpense 17,772us-gaap_InterestExpense
Net interest income 181,351us-gaap_InterestIncomeExpenseNet 163,519us-gaap_InterestIncomeExpenseNet 164,815us-gaap_InterestIncomeExpenseNet
Provision for loan losses 3,072us-gaap_ProvisionForLoanAndLeaseLosses 1,258us-gaap_ProvisionForLoanAndLeaseLosses 3,100us-gaap_ProvisionForLoanAndLeaseLosses
Net interest income after provision for loan losses 178,279us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss 162,261us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss 161,715us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss
NONINTEREST INCOME      
Trust revenue 9,180us-gaap_FeesAndCommissionsFiduciaryAndTrustActivities 8,072us-gaap_FeesAndCommissionsFiduciaryAndTrustActivities 7,315us-gaap_FeesAndCommissionsFiduciaryAndTrustActivities
Service charges on deposits 56,389us-gaap_FeesAndCommissionsDepositorAccounts 52,450us-gaap_FeesAndCommissionsDepositorAccounts 46,492us-gaap_FeesAndCommissionsDepositorAccounts
Securities transactions 1,641us-gaap_GainLossOnSaleOfSecuritiesNet 420us-gaap_GainLossOnSaleOfSecuritiesNet 4,915us-gaap_GainLossOnSaleOfSecuritiesNet
Income from sales of loans 1,813us-gaap_GainLossOnSalesOfLoansNet 2,306us-gaap_GainLossOnSalesOfLoansNet 2,773us-gaap_GainLossOnSalesOfLoansNet
Insurance commissions 14,642us-gaap_InsuranceCommissionsAndFees 14,094us-gaap_InsuranceCommissionsAndFees 12,626us-gaap_InsuranceCommissionsAndFees
Cash management 6,741banf_CashManagement 6,250banf_CashManagement 7,504banf_CashManagement
Gain on sale of other assets 335us-gaap_GainsLossesOnSalesOfAssets 293us-gaap_GainsLossesOnSalesOfAssets 374us-gaap_GainsLossesOnSalesOfAssets
Other 5,672us-gaap_NoninterestIncomeOther 6,270us-gaap_NoninterestIncomeOther 5,718us-gaap_NoninterestIncomeOther
Total noninterest income 96,413us-gaap_NoninterestIncome 90,155us-gaap_NoninterestIncome 87,717us-gaap_NoninterestIncome
NONINTEREST EXPENSE      
Salaries and employee benefits 108,640us-gaap_LaborAndRelatedExpense 102,165us-gaap_LaborAndRelatedExpense 99,535us-gaap_LaborAndRelatedExpense
Occupancy and fixed assets expense, net 11,610us-gaap_OccupancyNet 10,635us-gaap_OccupancyNet 10,576us-gaap_OccupancyNet
Depreciation 9,595us-gaap_Depreciation 9,412us-gaap_Depreciation 9,013us-gaap_Depreciation
Amortization of intangible assets 1,754us-gaap_AmortizationOfIntangibleAssets 1,665us-gaap_AmortizationOfIntangibleAssets 1,827us-gaap_AmortizationOfIntangibleAssets
Data processing services 4,689us-gaap_InformationTechnologyAndDataProcessing 4,785us-gaap_InformationTechnologyAndDataProcessing 4,822us-gaap_InformationTechnologyAndDataProcessing
Net expense from other real estate owned 511us-gaap_ForeclosedRealEstateExpense 434us-gaap_ForeclosedRealEstateExpense 1,547us-gaap_ForeclosedRealEstateExpense
Marketing and business promotion 7,024us-gaap_MarketingAndAdvertisingExpense 6,652us-gaap_MarketingAndAdvertisingExpense 7,327us-gaap_MarketingAndAdvertisingExpense
Deposit insurance 3,291us-gaap_FederalDepositInsuranceCorporationPremiumExpense 3,003us-gaap_FederalDepositInsuranceCorporationPremiumExpense 2,949us-gaap_FederalDepositInsuranceCorporationPremiumExpense
Other 36,407us-gaap_OtherNoninterestExpense 32,823us-gaap_OtherNoninterestExpense 32,832us-gaap_OtherNoninterestExpense
Total noninterest expense 183,521us-gaap_NoninterestExpense 171,574us-gaap_NoninterestExpense 170,428us-gaap_NoninterestExpense
Income before taxes 91,171us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 80,842us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 79,004us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax expense 27,284us-gaap_IncomeTaxExpenseBenefit 26,525us-gaap_IncomeTaxExpenseBenefit 27,104us-gaap_IncomeTaxExpenseBenefit
Net income 63,887us-gaap_NetIncomeLoss 54,317us-gaap_NetIncomeLoss 51,900us-gaap_NetIncomeLoss
NET INCOME PER COMMON SHARE      
Basic $ 4.14us-gaap_EarningsPerShareBasic $ 3.56us-gaap_EarningsPerShareBasic $ 3.42us-gaap_EarningsPerShareBasic
Diluted $ 4.04us-gaap_EarningsPerShareDiluted $ 3.49us-gaap_EarningsPerShareDiluted $ 3.36us-gaap_EarningsPerShareDiluted
OTHER COMPREHENSIVE INCOME      
Unrealized gains (losses) on securities, net of tax of $(747), $1,249 and $719, respectively 613us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLoss (2,321)us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLoss (1,334)us-gaap_AvailableForSaleSecuritiesChangeInNetUnrealizedHoldingGainLoss
Reclassification adjustment for gains included in net income, net of tax of $206, $48 and $965, respectively (327)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax (89)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax (1,793)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax
Other comprehensive income (loss), net of tax of $(541), $1,297 and $1,684, respectively 286us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent (2,410)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent (3,127)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Comprehensive income $ 64,173us-gaap_ComprehensiveIncomeNetOfTax $ 51,907us-gaap_ComprehensiveIncomeNetOfTax $ 48,773us-gaap_ComprehensiveIncomeNetOfTax