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Loans and Allowance for Loan Losses (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Schedule of loans outstanding by category
Total loans	$ 3,219,967	$ 3,242,427	$ 3,049,376
Percent	100.00%	100.00%	100.00%
Loans held for sale (included above)	10,287	13,661	15,585
Taxable [Member]
Schedule of loans outstanding by category
Total loans	9,272	9,412	7,332
Percent	0.29%	0.29%	0.24%
Tax-exempt [Member]
Schedule of loans outstanding by category
Total loans	13,034	13,194	15,810
Percent	0.41%	0.41%	0.52%
Other (not classified above) [Member]
Schedule of loans outstanding by category
Total loans	19,521	20,360	21,821
Percent	0.61%	0.63%	0.72%
Commercial and Industrial [Member]
Schedule of loans outstanding by category
Total loans	518,438	559,274	526,028
Percent	16.10%	17.25%	17.25%
Oil & gas production & equipment [Member]
Schedule of loans outstanding by category
Total loans	154,392	154,380	129,710
Percent	4.79%	4.76%	4.25%
Agriculture [Member]
Schedule of loans outstanding by category
Total loans	96,094	93,274	90,659
Percent	2.98%	2.88%	2.97%
Construction [Member]
Schedule of loans outstanding by category
Total loans	231,770	226,102	200,609
Percent	7.20%	6.97%	6.58%
Farmland [Member]
Schedule of loans outstanding by category
Total loans	124,347	125,033	107,751
Percent	3.86%	3.86%	3.53%
One to four family residences [Member]
Schedule of loans outstanding by category
Total loans	680,129	669,230	660,725
Percent	21.12%	20.64%	21.67%
Multifamily residential properties [Member]
Schedule of loans outstanding by category
Total loans	47,506	50,721	40,164
Percent	1.48%	1.56%	1.32%
Commercial [Member]
Schedule of loans outstanding by category
Total loans	1,084,864	1,068,445	1,004,596
Percent	33.69%	32.95%	32.94%
Consumer [Member]
Schedule of loans outstanding by category
Total loans	$ 240,600	$ 253,002	$ 244,171
Percent	7.47%	7.80%	8.01%

X

- Definition

Loans percent.

+ References

No definition available.

+ Details

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Namespace Prefix:	banf_
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Period Type:	instant

X

- Definition

Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6375948&loc=d3e4428-111522



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

-Publisher AICPA

-Name Statement of Position (SOP)

-Number 01-6

-Paragraph 13

-Subparagraph e

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents loans held-for-sale as presented on the statement of financial position which may include mortgage loans held-for-sale, finance receivables held-for-sale, or any other loans classified as held-for-sale which are due the Company as of the balance sheet date.

+ References

No definition available.

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