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Cover
Nov. 05, 2021
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Nov. 05, 2021
Entity File Number 001-40379
Entity Registrant Name FIVE STAR BANCORP
Entity Central Index Key 0001275168
Entity Tax Identification Number 75-3100966
Entity Incorporation, State or Country Code CA
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
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common Stock, no par value per share
Trading Symbol FSBC
Security Exchange Name NASDAQ
Entity Emerging Growth Company true
Elected Not To Use the Extended Transition Period false