XML 58 R44.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Loans and Allowance for Loan Losses - Allowance for Loan Losses Outstanding by Impairment Methodology (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Sep. 30, 2012
--- | --- | ---
Allowance For Credit Losses And Finance Receivables By Portfolio Individually And Collectively Evaluated For Impairment [Line Items] |  |
Individually evaluated for impairment | $ 5,653 | $ 6,928
Collectively evaluated for impairment | 33,206 | 30,330
Non-residential real estate owner occupied [Member] |  |
Allowance For Credit Losses And Finance Receivables By Portfolio Individually And Collectively Evaluated For Impairment [Line Items] |  |
Individually evaluated for impairment | 228 | 462
Collectively evaluated for impairment | 4,629 | 4,824
Non-residential real estate other [Member] |  |
Allowance For Credit Losses And Finance Receivables By Portfolio Individually And Collectively Evaluated For Impairment [Line Items] |  |
Individually evaluated for impairment | 2,529 | 1,934
Collectively evaluated for impairment | 8,743 | 6,663
Residential real estate permanent mortgage [Member] |  |
Allowance For Credit Losses And Finance Receivables By Portfolio Individually And Collectively Evaluated For Impairment [Line Items] |  |
Individually evaluated for impairment | 226 | 218
Collectively evaluated for impairment | 2,496 | 2,480
Residential real estate all other [Member] |  |
Allowance For Credit Losses And Finance Receivables By Portfolio Individually And Collectively Evaluated For Impairment [Line Items] |  |
Individually evaluated for impairment | 1,058 | 2,087
Collectively evaluated for impairment | 5,549 | 4,936
Non-consumer non-real estate [Member] |  |
Allowance For Credit Losses And Finance Receivables By Portfolio Individually And Collectively Evaluated For Impairment [Line Items] |  |
Individually evaluated for impairment | 1,052 | 1,692
Collectively evaluated for impairment | 7,811 | 7,478
Consumer non-real estate [Member] |  |
Allowance For Credit Losses And Finance Receivables By Portfolio Individually And Collectively Evaluated For Impairment [Line Items] |  |
Individually evaluated for impairment | 314 | 315
Collectively evaluated for impairment | 2,184 | 2,054
Other loans [Member] |  |
Allowance For Credit Losses And Finance Receivables By Portfolio Individually And Collectively Evaluated For Impairment [Line Items] |  |
Individually evaluated for impairment | 2,460 | 220
Collectively evaluated for impairment | 16,998 | 16,188
Acquired loans [Member] |  |
Allowance For Credit Losses And Finance Receivables By Portfolio Individually And Collectively Evaluated For Impairment [Line Items] |  |
Individually evaluated for impairment |  |
Collectively evaluated for impairment | $ 957 | $ 2,777

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

X
- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant