XML 35 R43.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Loans and Allowance for Loan Losses - Activity in All by Class of Loans (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2015 | Mar. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Balance at beginning of period | $ 40,889 us-gaap_LoansAndLeasesReceivableAllowance | $ 39,034 us-gaap_LoansAndLeasesReceivableAllowance
Charge- offs | (762)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs | (474)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
Recoveries | 96 us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery | 146 us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery
Net charge- offs | (666)us-gaap_AllowanceForLoanAndLeaseLossesAdjustmentsNet | (328)us-gaap_AllowanceForLoanAndLeaseLossesAdjustmentsNet
Provisions charged to operations | 1,334 us-gaap_ProvisionForLoanAndLeaseLosses | 1,218 us-gaap_ProvisionForLoanAndLeaseLosses
Balance at end of period | 41,557 us-gaap_LoansAndLeasesReceivableAllowance | 39,924 us-gaap_LoansAndLeasesReceivableAllowance
Non-residential Real Estate Owner Occupied [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Balance at beginning of period | 4,406 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = banf_NonResidentialRealEstateOwnerOccupiedMember | 4,827 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = banf_NonResidentialRealEstateOwnerOccupiedMember
Charge- offs | (1)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_FinancialInstrumentAxis = banf_NonResidentialRealEstateOwnerOccupiedMember | (4)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_FinancialInstrumentAxis = banf_NonResidentialRealEstateOwnerOccupiedMember
Recoveries | 1 us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery / us-gaap_FinancialInstrumentAxis = banf_NonResidentialRealEstateOwnerOccupiedMember | 31 us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery / us-gaap_FinancialInstrumentAxis = banf_NonResidentialRealEstateOwnerOccupiedMember
Net charge- offs |  | 27 us-gaap_AllowanceForLoanAndLeaseLossesAdjustmentsNet / us-gaap_FinancialInstrumentAxis = banf_NonResidentialRealEstateOwnerOccupiedMember
Provisions charged to operations | 55 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_FinancialInstrumentAxis = banf_NonResidentialRealEstateOwnerOccupiedMember | 158 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_FinancialInstrumentAxis = banf_NonResidentialRealEstateOwnerOccupiedMember
Balance at end of period | 4,461 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = banf_NonResidentialRealEstateOwnerOccupiedMember | 5,012 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = banf_NonResidentialRealEstateOwnerOccupiedMember
Non-residential Real Estate Other [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Balance at beginning of period | 9,616 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = banf_NonResidentialRealEstateOtherMember | 11,026 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = banf_NonResidentialRealEstateOtherMember
Recoveries |  | 3 us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery / us-gaap_FinancialInstrumentAxis = banf_NonResidentialRealEstateOtherMember
Net charge- offs |  | 3 us-gaap_AllowanceForLoanAndLeaseLossesAdjustmentsNet / us-gaap_FinancialInstrumentAxis = banf_NonResidentialRealEstateOtherMember
Provisions charged to operations | 282 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_FinancialInstrumentAxis = banf_NonResidentialRealEstateOtherMember | (344)us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_FinancialInstrumentAxis = banf_NonResidentialRealEstateOtherMember
Balance at end of period | 9,898 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = banf_NonResidentialRealEstateOtherMember | 10,685 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = banf_NonResidentialRealEstateOtherMember
Residential Real Estate Permanent Mortgage [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Balance at beginning of period | 2,948 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = banf_ResidentialRealEstatePermanentMortgageMember | 2,825 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = banf_ResidentialRealEstatePermanentMortgageMember
Charge- offs | (40)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_FinancialInstrumentAxis = banf_ResidentialRealEstatePermanentMortgageMember | (130)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_FinancialInstrumentAxis = banf_ResidentialRealEstatePermanentMortgageMember
Recoveries | 9 us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery / us-gaap_FinancialInstrumentAxis = banf_ResidentialRealEstatePermanentMortgageMember | 10 us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery / us-gaap_FinancialInstrumentAxis = banf_ResidentialRealEstatePermanentMortgageMember
Net charge- offs | (31)us-gaap_AllowanceForLoanAndLeaseLossesAdjustmentsNet / us-gaap_FinancialInstrumentAxis = banf_ResidentialRealEstatePermanentMortgageMember | (120)us-gaap_AllowanceForLoanAndLeaseLossesAdjustmentsNet / us-gaap_FinancialInstrumentAxis = banf_ResidentialRealEstatePermanentMortgageMember
Provisions charged to operations | 67 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_FinancialInstrumentAxis = banf_ResidentialRealEstatePermanentMortgageMember | 532 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_FinancialInstrumentAxis = banf_ResidentialRealEstatePermanentMortgageMember
Balance at end of period | 2,984 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = banf_ResidentialRealEstatePermanentMortgageMember | 3,237 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = banf_ResidentialRealEstatePermanentMortgageMember
Residential Real Estate All Other [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Balance at beginning of period | 6,269 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = banf_ResidentialRealEstateAllOtherMember | 6,708 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = banf_ResidentialRealEstateAllOtherMember
Charge- offs | (68)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_FinancialInstrumentAxis = banf_ResidentialRealEstateAllOtherMember | (49)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_FinancialInstrumentAxis = banf_ResidentialRealEstateAllOtherMember
Recoveries | 5 us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery / us-gaap_FinancialInstrumentAxis = banf_ResidentialRealEstateAllOtherMember | 4 us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery / us-gaap_FinancialInstrumentAxis = banf_ResidentialRealEstateAllOtherMember
Net charge- offs | (63)us-gaap_AllowanceForLoanAndLeaseLossesAdjustmentsNet / us-gaap_FinancialInstrumentAxis = banf_ResidentialRealEstateAllOtherMember | (45)us-gaap_AllowanceForLoanAndLeaseLossesAdjustmentsNet / us-gaap_FinancialInstrumentAxis = banf_ResidentialRealEstateAllOtherMember
Provisions charged to operations | 372 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_FinancialInstrumentAxis = banf_ResidentialRealEstateAllOtherMember | (178)us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_FinancialInstrumentAxis = banf_ResidentialRealEstateAllOtherMember
Balance at end of period | 6,578 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = banf_ResidentialRealEstateAllOtherMember | 6,485 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = banf_ResidentialRealEstateAllOtherMember
Non-consumer Non-real Estate [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Balance at beginning of period | 12,771 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = banf_NonConsumerNonRealEstateMember | 8,977 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = banf_NonConsumerNonRealEstateMember
Charge- offs | (153)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_FinancialInstrumentAxis = banf_NonConsumerNonRealEstateMember | (70)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_FinancialInstrumentAxis = banf_NonConsumerNonRealEstateMember
Recoveries | 31 us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery / us-gaap_FinancialInstrumentAxis = banf_NonConsumerNonRealEstateMember | 14 us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery / us-gaap_FinancialInstrumentAxis = banf_NonConsumerNonRealEstateMember
Net charge- offs | (122)us-gaap_AllowanceForLoanAndLeaseLossesAdjustmentsNet / us-gaap_FinancialInstrumentAxis = banf_NonConsumerNonRealEstateMember | (56)us-gaap_AllowanceForLoanAndLeaseLossesAdjustmentsNet / us-gaap_FinancialInstrumentAxis = banf_NonConsumerNonRealEstateMember
Provisions charged to operations | 419 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_FinancialInstrumentAxis = banf_NonConsumerNonRealEstateMember | 782 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_FinancialInstrumentAxis = banf_NonConsumerNonRealEstateMember
Balance at end of period | 13,068 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = banf_NonConsumerNonRealEstateMember | 9,703 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = banf_NonConsumerNonRealEstateMember
Consumer Non-real Estate [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Balance at beginning of period | 2,404 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = banf_ConsumerNonRealEstateMember | 2,556 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = banf_ConsumerNonRealEstateMember
Charge- offs | (127)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_FinancialInstrumentAxis = banf_ConsumerNonRealEstateMember | (140)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_FinancialInstrumentAxis = banf_ConsumerNonRealEstateMember
Recoveries | 15 us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery / us-gaap_FinancialInstrumentAxis = banf_ConsumerNonRealEstateMember | 62 us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery / us-gaap_FinancialInstrumentAxis = banf_ConsumerNonRealEstateMember
Net charge- offs | (112)us-gaap_AllowanceForLoanAndLeaseLossesAdjustmentsNet / us-gaap_FinancialInstrumentAxis = banf_ConsumerNonRealEstateMember | (78)us-gaap_AllowanceForLoanAndLeaseLossesAdjustmentsNet / us-gaap_FinancialInstrumentAxis = banf_ConsumerNonRealEstateMember
Provisions charged to operations | 35 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_FinancialInstrumentAxis = banf_ConsumerNonRealEstateMember | 95 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_FinancialInstrumentAxis = banf_ConsumerNonRealEstateMember
Balance at end of period | 2,327 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = banf_ConsumerNonRealEstateMember | 2,573 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = banf_ConsumerNonRealEstateMember
Other Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Balance at beginning of period | 2,359 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = banf_OtherLoansMember | 1,991 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = banf_OtherLoansMember
Charge- offs | (213)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_FinancialInstrumentAxis = banf_OtherLoansMember | (64)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_FinancialInstrumentAxis = banf_OtherLoansMember
Recoveries | 9 us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery / us-gaap_FinancialInstrumentAxis = banf_OtherLoansMember | 17 us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery / us-gaap_FinancialInstrumentAxis = banf_OtherLoansMember
Net charge- offs | (204)us-gaap_AllowanceForLoanAndLeaseLossesAdjustmentsNet / us-gaap_FinancialInstrumentAxis = banf_OtherLoansMember | (47)us-gaap_AllowanceForLoanAndLeaseLossesAdjustmentsNet / us-gaap_FinancialInstrumentAxis = banf_OtherLoansMember
Provisions charged to operations | 86 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_FinancialInstrumentAxis = banf_OtherLoansMember | 128 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_FinancialInstrumentAxis = banf_OtherLoansMember
Balance at end of period | 2,241 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = banf_OtherLoansMember | 2,072 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = banf_OtherLoansMember
Acquired Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Balance at beginning of period | 116 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = banf_AcquiredLoansMember | 124 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = banf_AcquiredLoansMember
Charge- offs | (160)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_FinancialInstrumentAxis = banf_AcquiredLoansMember | (17)us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs / us-gaap_FinancialInstrumentAxis = banf_AcquiredLoansMember
Recoveries | 26 us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery / us-gaap_FinancialInstrumentAxis = banf_AcquiredLoansMember | 5 us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery / us-gaap_FinancialInstrumentAxis = banf_AcquiredLoansMember
Net charge- offs | (134)us-gaap_AllowanceForLoanAndLeaseLossesAdjustmentsNet / us-gaap_FinancialInstrumentAxis = banf_AcquiredLoansMember | (12)us-gaap_AllowanceForLoanAndLeaseLossesAdjustmentsNet / us-gaap_FinancialInstrumentAxis = banf_AcquiredLoansMember
Provisions charged to operations | 18 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_FinancialInstrumentAxis = banf_AcquiredLoansMember | 45 us-gaap_ProvisionForLoanAndLeaseLosses / us-gaap_FinancialInstrumentAxis = banf_AcquiredLoansMember
Balance at end of period |  | $ 157 us-gaap_LoansAndLeasesReceivableAllowance / us-gaap_FinancialInstrumentAxis = banf_AcquiredLoansMember

X
- Definition Amount of other addition (reduction) in allowance reserve for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph d -Article 9 + Details
Name: | us-gaap_AllowanceForLoanAndLeaseLossesAdjustmentsNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

X
- Definition Amount of recovery of financing receivables doubtful of collection that were previously charged off. + 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 (c)(4) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of direct write-downs of financing receivables charged against the allowance. + 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 (c)(3) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for 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 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph d -Article 9 Reference 3: 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=35738203&loc=SL6953423-111524 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section L -Subsection 1 + Details
Name: | us-gaap_LoansAndLeasesReceivableAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of expense related to estimated loss from loan and lease transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
Name: | us-gaap_ProvisionForLoanAndLeaseLosses
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=banf_AcquiredLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=banf_ConsumerNonRealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=banf_NonConsumerNonRealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=banf_NonResidentialRealEstateOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=banf_NonResidentialRealEstateOwnerOccupiedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=banf_OtherLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=banf_ResidentialRealEstateAllOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=banf_ResidentialRealEstatePermanentMortgageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |