XML 10 R1.htm IDEA: XBRL DOCUMENT v3.23.3
Document and Entity Information - shares
 9 Months Ended
Sep. 30, 2023
Nov. 09, 2023
Document and Entity Information    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Sep. 30, 2023  
Document Transition Report false  
Entity File Number 001-38676  
Entity Registrant Name Bank First Corp  
Entity Incorporation, State or Country Code WI  
Entity Tax Identification Number 39-1435359  
Entity Address, Address Line One 402 North 8th Street  
Entity Address, City or Town Manitowoc  
Entity Address, State or Province WI  
Entity Address, Postal Zip Code 54220  
City Area Code 920  
Local Phone Number 652-3100  
Title of 12(b) Security Common Stock, par value $0.01 per share  
Trading Symbol BFC  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company true  
Entity Ex Transition Period false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   10,365,891
Entity Central Index Key 0001746109  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2023  
Document Fiscal Period Focus Q3  
Amendment Flag false