Quarterly report pursuant to Section 13 or 15(d)

Document And Entity Information

v3.23.3
Document And Entity Information - shares
 9 Months Ended
Sep. 30, 2023
Oct. 27, 2023
Document Information [Line Items]    
Entity Central Index Key 0001430723  
Entity Registrant Name ServisFirst Bancshares, Inc.  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Document Fiscal Period Focus Q3  
Document Fiscal Year Focus 2023  
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Sep. 30, 2023  
Document Transition Report false  
Entity File Number 001-36452  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 26-0734029  
Entity Address, Address Line One 2500 Woodcrest Place  
Entity Address, City or Town Birmingham  
Entity Address, State or Province AL  
Entity Address, Postal Zip Code 35209  
City Area Code 205  
Local Phone Number 949-0302  
Title of 12(b) Security Common stock, par value $.001 per share  
Trading Symbol SFBS  
Security Exchange Name NYSE  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   54,435,170