XML 14 R1.htm IDEA: XBRL DOCUMENT v3.20.4
Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2020
Jan. 31, 2021
Jun. 30, 2020
Document And Entity Information [Line Items]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2020    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY    
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    
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   32,746,513  
Entity Public Float     $ 767,536,284
Documents Incorporated by Reference

Portions of the Proxy Statement for the 2021 Annual Meeting of Stockholders of the registrant (the “2021 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