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Document and Entity Information
May 20, 2026
Cover [Abstract]  
Amendment Flag false
Entity Central Index Key 0001473844
Document Type 8-K
Document Period End Date May 20, 2026
Entity Registrant Name Stellar Bancorp, Inc.
Entity Incorporation State Country Code TX
Entity File Number 001-38280
Entity Tax Identification Number 20-8339782
Entity Address, Address Line One 9 Greenway Plaza
Entity Address, Address Line Two Suite 110
Entity Address, City or Town Houston
Entity Address, State or Province TX
Entity Address, Postal Zip Code 77046
City Area Code (713)
Local Phone Number 210-7600
Written Communications true
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Common stock, par value $0.01 per share
Trading Symbol STEL
Security Exchange Name NYSE
Entity Emerging Growth Company false