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Cover - shares
 6 Months Ended
Jun. 30, 2024
Aug. 02, 2024
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2024  
Document Transition Report false  
Entity File Number 001-40379  
Entity Registrant Name FIVE STAR BANCORP  
Entity Incorporation, State or Country Code CA  
Entity Tax Identification Number 75-3100966  
Entity Address, Address Line One 3100 Zinfandel Drive  
Entity Address, Address Line Two Suite 100  
Entity Address, City or Town Rancho Cordova  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 95670  
City Area Code (916)  
Local Phone Number 626-5000  
Title of 12(b) Security Common stock, no par value per share  
Trading Symbol FSBC  
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   21,319,583
Entity Central Index Key 0001275168  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2024  
Document Fiscal Period Focus Q2  
Amendment Flag false