XML 52 R42.htm IDEA: XBRL DOCUMENT
v3.22.2.2

Loans Held for Investment and Allowance for Credit Losses on Loans - Summary of Loans Held for Investment by Portfolio Segment (Parenthetical) (Detail) - USD ($) | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Receivables [Abstract] |  |
Accrued interest receivable | $ 25,400,000 | $ 21,000,000.0
Pay check protection program loan held for investment | 1,100,000 | 80,400,000
Paycheck protection program unamortized processing fees | $ 0 | $ 2,000,000.0

X
- Definition Pay check protection program loan held for investment. + References No definition available. + Details
Name: | banf_PayCheckProtectionProgramLoanHeldForInvestment
Namespace Prefix: | banf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Paycheck protection program unamortized processing fees. + References No definition available. + Details
Name: | banf_PaycheckProtectionProgramUnamortizedProcessingFees
Namespace Prefix: | banf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)(a)(4)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_InterestReceivable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_ReceivablesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration