XML 16 R70.htm IDEA: XBRL DOCUMENT v3.2.0.727

Derivative Financial Instruments - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2015
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Company’s share of total profit	35.00%

X

- Definition

Profit share percentage.

+ References

No definition available.

+ Details

Name:	banf_ProfitSharePercentage
Namespace Prefix:	banf_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration