XML 65 R62.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Fair Value Measurements - Assets Measured at Fair Value on Nonrecurring Basis (Detail) (USD $) In Thousands, unless otherwise specified | 9 Months Ended
--- | ---
Sep. 30, 2013 | Sep. 30, 2012
Impaired loans (less specific allowance) [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Total Fair Value | $ 36,286 | $ 43,206
Gains (Losses) |  |
Foreclosed Assets [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Total Fair Value | 307 | 237
Gains (Losses) | (9) | (84)
Other real estate owned [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Total Fair Value | 8,121 | 9,559
Gains (Losses) | (754) | (1,226)
Level 1 Inputs [Member] | Impaired loans (less specific allowance) [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Total Fair Value |  |
Level 1 Inputs [Member] | Foreclosed Assets [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Total Fair Value |  |
Level 1 Inputs [Member] | Other real estate owned [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Total Fair Value |  |
Level 2 Inputs [Member] | Impaired loans (less specific allowance) [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Total Fair Value |  |
Level 2 Inputs [Member] | Foreclosed Assets [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Total Fair Value |  |
Level 2 Inputs [Member] | Other real estate owned [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Total Fair Value |  |
Level 3 Inputs [Member] | Impaired loans (less specific allowance) [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Total Fair Value | 36,286 | 43,206
Level 3 Inputs [Member] | Foreclosed Assets [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Total Fair Value | 307 | 237
Level 3 Inputs [Member] | Other real estate owned [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Total Fair Value | $ 8,121 | $ 9,559

X
- Definition Gains Losses + References No definition available. + Details
Name: | banf_GainsLosses
Namespace Prefix: | banf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
Name: | us-gaap_AssetsFairValueDisclosureNonrecurring
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration