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Net Income Per Common Share - Average Exercise Prices of Options Excluded from Computation of Diluted Net Income Per Common Share (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Abstract]
Shares	69,405us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	118,603us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	604,429us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Average Exercise Price	$ 55.87banf_AverageExercisePricesOfOptionsExcludedFromComputationOfDilutedNetIncomePerCommonShare	$ 42.79banf_AverageExercisePricesOfOptionsExcludedFromComputationOfDilutedNetIncomePerCommonShare	$ 38.69banf_AverageExercisePricesOfOptionsExcludedFromComputationOfDilutedNetIncomePerCommonShare

X

- Definition

Average exercise prices of options excluded from computation of diluted net income per common share.

+ References

No definition available.

+ Details

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X

- Details

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X

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Antidilution

-URI http://asc.fasb.org/extlink&oid=6505113



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Diluted Earnings Per Share

-URI http://asc.fasb.org/extlink&oid=6510752



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Contingent Stock Agreement

-URI http://asc.fasb.org/extlink&oid=6508534

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