Annual report [Section 13 and 15(d), not S-K Item 405]

Document And Entity Information

v3.25.0.1
Document And Entity Information - USD ($)
12 Months Ended
Dec. 31, 2024
Feb. 26, 2025
Jun. 30, 2024
Document Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2024    
Document Transition Report false    
Entity File Number 001-36452    
Entity Registrant Name SERVISFIRST BANCSHARES, INC.    
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 Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
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    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 3,159,137,000
Entity Common Stock, Shares Outstanding (in shares)   54,582,041  
Auditor Name Forvis Mazars, LLP    
Auditor Firm ID 686    
Auditor Location Tampa, Florida    
Entity Central Index Key 0001430723    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Amendment Flag false