XML 102 R54.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Stockholders' Equity - Additional Information (Detail) (USD $) In Billions, unless otherwise specified | 6 Months Ended
--- | ---
Jun. 30, 2013
Stockholders Equity [Line Items] |
Minimum Tier 1 Ratio to be well capitalized | 6.00%
Minimum combined Tier 1 and Tier 2 Ratio to be well capitalized | 10.00%
Minimum Leverage Ratio to be well capitalized | 5.00%
2015 [Member] |
Stockholders Equity [Line Items] |
Implementation of the deductions and other adjustments to CET1 | 4 years
Implementation of the deductions and other adjustments to CET1, Percentage | 40.00%
2016 [Member] |
Stockholders Equity [Line Items] |
Implementation of the capital conservation buffer, Percentage | 0.625%
Capital conservation buffer implementation phaseout period | 4 years
2019 [Member] |
Stockholders Equity [Line Items] |
Capital Conservation Buffer Maximum Level | 2.50%
After 2015 [Member] |
Stockholders Equity [Line Items] |
Implementation of the deductions and other adjustments to CET1, Additional Percentage | 20.00%
Maximum [Member] |
Stockholders Equity [Line Items] |
Quantitative limit for trust preferred securities to be included in tier 1 capital | $ 10
Minimum [Member] | 2015 [Member] |
Stockholders Equity [Line Items] |
Minimum ratio of CET1 to risk-weighted assets | 4.50%
Tier 1 capital to risk-weighted assets | 6.00%
Total capital to risk weighted assets | 8.00%
Minimum leverage ratio | 4.00%

X
- Definition Combined Tier One And Tier Two Ratio + References No definition available. + Details
Name: | banf_CombinedTierOneAndTierTwoRatio
Namespace Prefix: | banf_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Common Equity Tier One Risk Based Capital To Risk Weighted Assets + References No definition available. + Details
Name: | banf_CommonEquityTierOneRiskBasedCapitalToRiskWeightedAssets
Namespace Prefix: | banf_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Implementation Of Deductions And Other Adjustments To Cet One + References No definition available. + Details
Name: | banf_ImplementationOfDeductionsAndOtherAdjustmentsToCetOne
Namespace Prefix: | banf_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Implementation Of Deductions And Other Adjustments To Cet One Additional Percentage + References No definition available. + Details
Name: | banf_ImplementationOfDeductionsAndOtherAdjustmentsToCetOneAdditionalPercentage
Namespace Prefix: | banf_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Implementation Of Deductions And Other Adjustments To Cet One Percentage + References No definition available. + Details
Name: | banf_ImplementationOfDeductionsAndOtherAdjustmentsToCetOnePercentage
Namespace Prefix: | banf_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Quantitative Limit For Trust Preferred Securities To Be Included In Tier One Capital + References No definition available. + Details
Name: | banf_QuantitativeLimitForTrustPreferredSecuritiesToBeIncludedInTierOneCapital
Namespace Prefix: | banf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | banf_StockholdersEquityLineItems
Namespace Prefix: | banf_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tier One Capital Conservation Buffer Maximum Level + References No definition available. + Details
Name: | banf_TierOneCapitalConservationBufferMaximumLevel
Namespace Prefix: | banf_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Tier One Capital Conservation Buffer to Risk Weighted Assets Required under Regulatory + References No definition available. + Details
Name: | banf_TierOneCapitalConservationBufferToRiskWeightedAssetsRequiredUnderRegulatory
Namespace Prefix: | banf_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tier One Risk Based Capital Conservation Buffer Initial Requirements Phasing Duration + References No definition available. + Details
Name: | banf_TierOneRiskBasedCapitalConservationBufferInitialRequirementsPhasingDuration
Namespace Prefix: | banf_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Total Capital divided by risk weighted assets as defined in the regulations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=7881181&loc=d3e65071-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7881181&loc=SL5958568-112826 + Details
Name: | us-gaap_CapitalToRiskWeightedAssets
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The amount of Tier 1 Leverage Capital required to be categorized as well capitalized divided by average assets as defined in the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7881181&loc=SL5958568-112826 + Details
Name: | us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Tier 1 Leverage Capital divided by average assets as defined in the regulations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=7881181&loc=d3e65071-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7881181&loc=SL5958568-112826 + Details
Name: | us-gaap_TierOneLeverageCapitalToAverageAssets
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The Tier 1 capital ratio (Tier 1 capital divided by risk weighted assets) required to be categorized as "well capitalized" under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7881181&loc=SL5958568-112826 + Details
Name: | us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Tier 1 capital divided by risk weighted assets as defined by regulations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=7881181&loc=d3e65071-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7881181&loc=SL5958568-112826 + Details
Name: | us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant