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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2019
Jan. 31, 2020
Jun. 30, 2019
Document And Entity Information [Line Items]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2019    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Entity Registrant Name BANCFIRST CORP /OK/    
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    
Entity Shell Company false    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity File Number 0-14384    
Entity Incorporation, State or Country Code OK    
Entity Tax Identification Number 73-1221379    
Entity Address, Address Line One 101 North Broadway    
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   32,695,575  
Entity Public Float     $ 1,049,634,555
Documents Incorporated by Reference

Portions of the Proxy Statement for the 2020 Annual Meeting of Stockholders of the registrant (the “2020 Proxy Statement”) to be filed pursuant to Regulation 14A are incorporated by reference into Part III of this report.

   
Common Stock [Member]      
Document And Entity Information [Line Items]      
Trading Symbol BANF    
Title of 12(b) Security Common Stock, $1.00 Par Value Per Share    
Security Exchange Name NASDAQ    
7.2% Cumulative Trust Preferred Securities [Member]      
Document And Entity Information [Line Items]      
Trading Symbol BANFP    
Security Exchange Name NASDAQ    
Title of 12(g) Security 7.2% Cumulative Trust Preferred Securities