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Stockholders' Equity - Summary of Shares Repurchased Under Stock Purchase Program (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014
Summary Of Shares Repurchased Under Stock Purchase Program [Abstract]
Number of shares repurchased	40,241us-gaap_StockRedeemedOrCalledDuringPeriodShares	6,787us-gaap_StockRedeemedOrCalledDuringPeriodShares
Average price of shares repurchased	$ 40.88us-gaap_TreasuryStockAcquiredAverageCostPerShare	$ 37.70us-gaap_TreasuryStockAcquiredAverageCostPerShare
Shares remaining to be repurchased	194,723us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased	234,964us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased	194,723us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased

X

- Details

Name:	banf_SummaryOfSharesRepurchasedUnderStockPurchaseProgramAbstract
Namespace Prefix:	banf_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Number of stock bought back by the entity at the exercise price or redemption price.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ References

No definition available.

+ Details

Name:	us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Total cost of shares repurchased divided by the total number of shares repurchased.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 30

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration