XML 34 R62.htm IDEA: XBRL DOCUMENT v3.19.3

Stockholders' Equity - Additional Information (Detail)	Sep. 30, 2019 USD ($)
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

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

Stockholders equity.

+ References

No definition available.

+ Details

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

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: