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Cash Due from Banks, Interest-Bearing Deposits and Federal Funds Sold - Summary of Vault Cash and Funds on Deposit with Federal Reserve Bank (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Average Amount Of Required Reserves [Abstract]
Vault cash and funds on deposit with the Federal Reserve Bank	$ 3,347,760	$ 2,255,198

X

- Definition

Average amount of required reserves.

+ References

No definition available.

+ Details

Name:	banf_AverageAmountOfRequiredReservesAbstract
Namespace Prefix:	banf_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Amount of pass-through reserves deposited with Federal Reserve Banks from member institutions of Federal Home Loan Banks (FHLBanks).

+ References

No definition available.

+ Details

Name:	us-gaap_CashPassThroughReserveFederalHomeLoanBank
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant