XML 79 R66.htm IDEA: XBRL DOCUMENT
v3.22.2

Stockholders' Equity - Additional Information (Detail) - USD ($) | 1 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2021 | Jun. 30, 2022 | Jun. 17, 2021
Stockholders Equity [Line Items] |  |  |
Additional shares to repurchase | 650,000 |  |
Subordinated Notes due 2036 [Member] | Private Placement [Member] |  |  |
Stockholders Equity [Line Items] |  |  |
Aggregate principal amount |  |  | $ 60,000,000
Small Business Administration (SBA), CARES Act, Paycheck Protection Program Lending Facility [Member] |  |  |
Stockholders Equity [Line Items] |  |  |
Percentage of risk weight under risk based capital rules |  | 0.00% |
Maximum [Member] |  |  |
Stockholders Equity [Line Items] |  |  |
Quantitative limit for trust preferred securities to be included in tier 1 capital |  | $ 15,000,000,000 |

X
- Definition Percentage of risk weight under risk-based capital rules. + References No definition available. + Details
Name: | banf_PercentageOfRiskWeightUnderRiskBasedCapitalRules
Namespace Prefix: | banf_
Data Type: | dtr-types: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
- Definition Stock repurchase program number of additional shares to be repurchased. + References No definition available. + Details
Name: | banf_StockRepurchaseProgramNumberOfAdditionalSharesToBeRepurchased
Namespace Prefix: | banf_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Stockholders equity. + References No definition available. + Details
Name: | banf_StockholdersEquityLineItems
Namespace Prefix: | banf_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28551-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124429444&loc=SL124452920-239629 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69C -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69B -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612 + Details
Name: | us-gaap_DebtInstrumentFaceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=banf_SubordinatedNotesDueTwoThousandThirtySixMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=us-gaap_PrivatePlacementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LoansInsuredOrGuaranteedByGovernmentAuthoritiesAxis=banf_SmallBusinessAdministrationCARESActPaycheckProtectionProgramLendingFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |