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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2022
Jan. 31, 2023
Jun. 30, 2022
Document And Entity Information [Line Items]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2022    
Document Fiscal Year Focus 2022    
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   32,891,024  
Entity Public Float     $ 1,913,667,565
Documents Incorporated by Reference

Portions of the Proxy Statement for the 2023 Annual Meeting of Stockholders of the registrant (the “2023 Proxy Statement”) to be filed pursuant to Regulation 14A are incorporated by reference into Part III of this report.

   
Auditor Name FORVIS, LLP    
Auditor Location Oklahoma City, OK    
Auditor Firm ID 686