XML 10 R1.htm IDEA: XBRL DOCUMENT v3.22.2.2
Cover Page - shares
9 Months Ended
Sep. 30, 2022
Nov. 07, 2022
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Sep. 30, 2022  
Document Transition Report false  
Entity File Number 001-39028  
Entity Registrant Name CROSSFIRST BANKSHARES, INC.  
Entity Incorporation, State or Country Code KS  
Entity Tax Identification Number 26-3212879  
Entity Address, Address Line One 11440 Tomahawk Creek Parkway  
Entity Address, City or Town Leawood  
Entity Address, State or Province KS  
Entity Address, Postal Zip Code 66211  
City Area Code 913  
Local Phone Number 754-9704  
Title of 12(b) Security Common Stock, par value $0.01 per share  
Trading Symbol CFB  
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   48,617,780
Entity Central Index Key 0001458412  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2022  
Document Fiscal Period Focus Q3  
Amendment Flag false