    <SEC-DOCUMENT>0000950170-24-130499-index.html : 20241125
    <SEC-HEADER>0000950170-24-130499.hdr.sgml : 20241125
    <ACCEPTANCE-DATETIME>20241125140903
    ACCESSION NUMBER:		0000950170-24-130499
    CONFORMED SUBMISSION TYPE:	8-K
    PUBLIC DOCUMENT COUNT:		21
    CONFORMED PERIOD OF REPORT:	20241125
    ITEM INFORMATION:		Regulation FD Disclosure
    FILED AS OF DATE:		20241125
    DATE AS OF CHANGE:		20241125

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			BANCFIRST CORP /OK/
    		CENTRAL INDEX KEY:			0000760498
    		STANDARD INDUSTRIAL CLASSIFICATION:	NATIONAL COMMERCIAL BANKS [6021]
    		ORGANIZATION NAME:           	02 Finance
    		IRS NUMBER:				731221379
    		STATE OF INCORPORATION:			OK
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		8-K
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	000-14384
    		FILM NUMBER:		241494797

    	BUSINESS ADDRESS:
    		STREET 1:		100 NORTH BROADWAY AVE
    		CITY:			OKLAHOMA CITY
    		STATE:			OK
    		ZIP:			73102-8401
    		BUSINESS PHONE:		4052701000

    	MAIL ADDRESS:
    		STREET 1:		100 NORTH BROADWAY AVE
    		CITY:			OKLAHOMA CITY
    		STATE:			OK
    		ZIP:			73102-8401

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	UNITED COMMUNITY CORP
    		DATE OF NAME CHANGE:	19890401
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>8-K
    <SEQUENCE>1
    <FILENAME>banf-20241125.htm
    <DESCRIPTION>8-K
    <TEXT>
    Document 1 - file: banf-20241125.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.1
    <SEQUENCE>2
    <FILENAME>banf-ex99_1.htm
    <DESCRIPTION>EX-99.1
    <TEXT>
    Document 2 - file: banf-ex99_1.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>img44656334_0.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 3 - file: img44656334_0.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>4
    <FILENAME>img44656334_1.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 4 - file: img44656334_1.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>5
    <FILENAME>img44656334_2.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 5 - file: img44656334_2.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>6
    <FILENAME>img44656334_3.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 6 - file: img44656334_3.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>7
    <FILENAME>img44656334_4.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 7 - file: img44656334_4.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>img44656334_5.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 8 - file: img44656334_5.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>9
    <FILENAME>img44656334_6.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 9 - file: img44656334_6.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>10
    <FILENAME>img44656334_7.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 10 - file: img44656334_7.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>11
    <FILENAME>img44656334_8.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 11 - file: img44656334_8.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-101.SCH
    <SEQUENCE>12
    <FILENAME>banf-20241125.xsd
    <DESCRIPTION>XBRL TAXONOMY EXTENSION SCHEMA WITH EMBEDDED LINKBASES DOCUMENT
    <TEXT>
    Document 12 - file: banf-20241125.xsd

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>14
    <FILENAME>R1.htm
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 14 - file: R1.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EXCEL
    <SEQUENCE>15
    <FILENAME>Financial_Report.xlsx
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 15 - file: Financial_Report.xlsx

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>16
    <FILENAME>Show.js
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 16 - file: Show.js

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>17
    <FILENAME>report.css
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 17 - file: report.css

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>19
    <FILENAME>FilingSummary.xml
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 19 - file: FilingSummary.html

    Document 19 - RAW XML: FilingSummary.xml

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>JSON
    <SEQUENCE>21
    <FILENAME>MetaLinks.json
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 21 - file: MetaLinks.json

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>ZIP
    <SEQUENCE>22
    <FILENAME>0000950170-24-130499-xbrl.zip
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 22 - file: 0000950170-24-130499-xbrl.zip

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>XML
    <SEQUENCE>23
    <FILENAME>banf-20241125_htm.xml
    <DESCRIPTION>IDEA: XBRL DOCUMENT
    <TEXT>
    Document 23 - file: banf-20241125_htm.html

    Document 23 - RAW XML: banf-20241125_htm.xml

    </DOCUMENT>
    </SEC-DOCUMENT>