XML 76 R63.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Loans and Allowance for Loan Losses - Schedule of Loans Outstanding by Category (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | $ 4,721,995 | $ 4,400,232
Percent | 100.00% | 100.00%
Taxable [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | $ 73,827 | $ 33,793
Percent | 1.56% | 0.77%
Tax-exempt [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | $ 48,626 | $ 47,283
Percent | 1.03% | 1.07%
Commercial and Financial [Member] | Commercial and Industrial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | $ 995,207 | $ 828,260
Percent | 21.08% | 18.82%
Commercial and Financial [Member] | Oil & Gas Production And Equipment [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | $ 95,574 | $ 84,228
Percent | 2.02% | 1.91%
Commercial and Financial [Member] | Agriculture [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | $ 141,249 | $ 144,751
Percent | 2.99% | 3.29%
Real Estate [Member] | Construction [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | $ 437,277 | $ 420,884
Percent | 9.26% | 9.57%
Real Estate [Member] | Farmland [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | $ 195,162 | $ 197,872
Percent | 4.13% | 4.50%
Real Estate [Member] | One to Four Family Residences [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | $ 875,766 | $ 846,360
Percent | 18.55% | 19.24%
Real Estate [Member] | Multifamily Residential Properties [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | $ 46,030 | $ 57,806
Percent | 0.98% | 1.31%
Real Estate [Member] | Commercial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | $ 1,487,927 | $ 1,426,643
Percent | 31.51% | 32.42%
Consumer [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | $ 284,373 | $ 279,704
Percent | 6.02% | 6.36%
Other (Not Classified Above) [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Total loans | $ 40,977 | $ 32,648
Percent | 0.87% | 0.74%

X
- Definition Percentage of loans outstanding by category. + References No definition available. + Details
Name: | banf_PercentageOfLoansOutstandingByCategory
Namespace Prefix: | banf_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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=82891408&loc=d3e4428-111522 + Details
Name: | us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=banf_TaxableMunicipalLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=banf_NontaxableMunicipalLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CollateralAxis=banf_CommercialAndIndustrialMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CollateralAxis=banf_OilAndGasProductionAndEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CollateralAxis=banf_AgricultureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=banf_RealEstatePortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CollateralAxis=banf_ConstructionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CollateralAxis=banf_FarmlandMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CollateralAxis=banf_OneToFourFamilyResidencesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CollateralAxis=banf_MultifamilyResidentialPropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CollateralAxis=us-gaap_CommercialRealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_UnallocatedFinancingReceivablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |