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Stock-Based Compensation - Summary of Activity Under Stock Option Plan (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Outstanding at beginning period - Options 1,029,657us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Options granted 35,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
Options exercised (8,032)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Options canceled, forfeited or expired - Options (15,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod
Outstanding at ending period - Options 1,041,625us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Exercisable at ending period - Options 503,900us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
Outstanding at beginning period - Wgtd. Avg. Exercise Price $ 36.55us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Options granted - Wgtd. Avg. Exercise Price $ 57.27us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
Options exercised - Wgtd. Avg. Exercise Price $ 30.42us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
Options cancelled, forfeited, or expired - Wgtd. Avg. Exercise Price $ 36.96banf_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsCancelledExpiredInPeriodWeightedAverageExercisePrice
Outstanding at ending period - Wgtd. Avg. Exercise Price $ 37.29us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Exercisable at ending period - Wgtd. Avg. Exercise Price $ 30.27us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
Outstanding at ending period - Wgtd. Avg. Remaining Contractual Term, years 8 years 6 months 7 days
Exercisable at ending period - Wgtd. Avg. Remaining Contractual Term, years 5 years 18 days
Outstanding at ending period - Aggregate Intrinsic Value $ 24,680us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
Exercisable at ending period - Aggregate Intrinsic Value $ 15,474us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1