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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2024
Jan. 31, 2025
Jun. 30, 2024
Document And Entity Information [Line Items]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2024    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Trading Symbol BANF    
Entity Registrant Name BANCFIRST CORPORATION    
Entity Central Index Key 0000760498    
Current Fiscal Year End Date --12-31    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag false    
Entity Shell Company false    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Title of 12(b) Security Common Stock, $1.00 Par Value Per Share    
Security Exchange Name NASDAQ    
Entity File Number 0-14384    
Entity Incorporation, State or Country Code OK    
Entity Tax Identification Number 73-1221379    
Entity Address, Address Line One 100 N. Broadway Ave.    
Entity Address, City or Town Oklahoma City    
Entity Address, State or Province OK    
Entity Address, Postal Zip Code 73102    
City Area Code 405    
Local Phone Number 270-1086    
Document Annual Report true    
Document Transition Report false    
Entity Common Stock, Shares Outstanding   33,228,202  
Entity Public Float     $ 1,814,370,049
Documents Incorporated by Reference Portions of the Proxy Statement for the 2025 Annual Meeting of Stockholders of the registrant (the “2025 Proxy Statement”) to be filed pursuant to Regulation 14A are incorporated by reference into Part III of this report.    
Auditor Name Forvis Mazars, LLP    
Auditor Location Oklahoma City, OK    
Auditor Firm ID 686    
Auditor Opinion

Opinion on the Consolidated Financial Statements

 

We have audited the accompanying consolidated balance sheets of BancFirst Corporation (Company) as of December 31, 2024 and 2023, the related consolidated statements of comprehensive income, stockholders’ equity, and cash flows for each of the years in the three-year period ended December 31, 2024, and the related notes (collectively referred to as the “financial statements”). In our opinion, the consolidated financial statements referred to above present fairly, in all material respects, the consolidated financial position of the Company as of December 31, 2024 and 2023 and the results of its operations and its cash flows for each of the years in the three-year period ended December 31, 2024, in conformity with accounting principles generally accepted in the United States of America.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the Company’s internal control over financial reporting as of December 31, 2024 based on criteria established in Internal Control – Integrated Framework (2013)issued by the Committee of Sponsoring Organizations of the Treadway Commission, and our report dated February 28, 2025 expressed an unqualified opinion thereon.

    
Document Financial Statement Error Correction [Flag] false