0001552781-21-000525 | 10-Q | XBRL Viewer

Cover - shares	3 Months Ended
Cover - shares	Mar. 31, 2021	Jun. 14, 2021
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Quarterly Report	true
Document Transition Report	false
Document Period End Date	Mar. 31, 2021
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2021
Current Fiscal Year End Date	--12-31
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
Title of 12(b) Security	Common stock, no par value per share
Trading Symbol	FSBC
Security Exchange Name	NASDAQ
Entity Current Reporting Status	No
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Elected Not To Use the Extended Transition Period	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		17,225,508

Label	Element	Value
Loan-related fees	fsbc_LoanRelatedFees	$ 122,000
Loan-related fees	fsbc_LoanRelatedFees	218,000
Held-to-maturity Securities, Gross Unrealized Loss	fsbc_HeldToMaturitySecuritiesGrossUnrealizedLoss
Held-to-maturity Securities, Gross Unrealized Loss	fsbc_HeldToMaturitySecuritiesGrossUnrealizedLoss
Held-to-maturity Securities, Gross Unrealized Loss	fsbc_HeldToMaturitySecuritiesGrossUnrealizedLoss
Held-to-maturity Securities, Gross Unrealized Loss	fsbc_HeldToMaturitySecuritiesGrossUnrealizedLoss
Purchases of securities available-for-sale	fsbc_PurchaseOfOtherInvestmentSecurities	(28,761,000)
Purchases of securities available-for-sale	fsbc_PurchaseOfOtherInvestmentSecurities	$ (16,664,000)
Number of Securities with Gross Unrealized Losses	fsbc_NumberOfSecuritiesWithGrossUnrealizedLosses	113
Number of Securities with Gross Unrealized Losses	fsbc_NumberOfSecuritiesWithGrossUnrealizedLosses	31
Service charges on deposit accounts	fsbc_ServiceChargesOnDepositAccounts	$ 90,000
Service charges on deposit accounts	fsbc_ServiceChargesOnDepositAccounts	100,000
Loan-related expenses	fsbc_LoanRelatedExpenses	229,000
Loan-related expenses	fsbc_LoanRelatedExpenses	$ 131,000
Number of Securities with Gross Unrealized Losses, Less Than 12 Months	fsbc_NumberOfSecuritiesWithGrossUnrealizedLossesLessThan12Months	14
Number of Securities with Gross Unrealized Losses, Less Than 12 Months	fsbc_NumberOfSecuritiesWithGrossUnrealizedLossesLessThan12Months	14
Number of Securities with Gross Unrealized Losses, More Than 12 Months	fsbc_NumberOfSecuritiesWithGrossUnrealizedLossesMoreThan12Months	99
Number of Securities with Gross Unrealized Losses, More Than 12 Months	fsbc_NumberOfSecuritiesWithGrossUnrealizedLossesMoreThan12Months	17
Deposits, $5 millions or More, Total	fsbc_Deposits5MillionOrMore	$ 964,900,000
Held-to-maturity Securities, Gross Unrealized Gain	fsbc_HeldToMaturitySecuritiesGrossUnrealizedGains	246,000
Held-to-maturity Securities, Gross Unrealized Gain	fsbc_HeldToMaturitySecuritiesGrossUnrealizedGains	246,000
Held-to-maturity Securities, Gross Unrealized Gain	fsbc_HeldToMaturitySecuritiesGrossUnrealizedGains	776,000
Held-to-maturity Securities, Gross Unrealized Gain	fsbc_HeldToMaturitySecuritiesGrossUnrealizedGains	$ 776,000
Number of Deposits over 5 million	fsbc_NumberOfDeposits	56
Largest Single Deposit	fsbc_LargestSingleDeposit	$ 160,400,000
ReclassificationAdjustmentForNetRealizedGainsIncludedInNetIncome	fsbc_ReclassificationAdjustmentForNetRealizedGainsIncludedInNetIncome	185,000
ReclassificationAdjustmentForNetRealizedGainsIncludedInNetIncome	fsbc_ReclassificationAdjustmentForNetRealizedGainsIncludedInNetIncome	532,000
FHLB stock dividends	fsbc_FHLBStockDividends	78,000
FHLB stock dividends	fsbc_FHLBStockDividends	$ 89,000

Interest Bearing Deposits (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Interest-bearing Deposits
Time, $250 or more	$ 7,663	$ 7,568

Interest Bearing Deposits (Details 4) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Interest-bearing Deposits
Time, $250 or more	$ 7	$ 386

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