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Cover Page - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Feb. 24, 2026
Jun. 30, 2025
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2025    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-38280    
Entity Registrant Name Stellar Bancorp, Inc.    
Entity Incorporation, State or Country Code TX    
Entity Tax Identification Number 20-8339782    
Entity Address, Address Line One 9 Greenway Plaza, 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    
Title of 12(b) Security Common stock, par value $0.01 per share    
Trading Symbol STEL    
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 false    
Entity Shell Company false    
Entity Public Float     $ 1,300
Entity Common Stock Shares Outstanding   50,772,216  
Documents Incorporated by Reference
Portions of the Proxy Statement relating to the 2026 Annual Meeting of Shareholders of Stellar Bancorp, Inc., which will be filed within 120 days after December 31, 2025, are incorporated by reference into Part III, Items 10-14 of this Annual Report on Form 10-K.
    
Entity Central Index Key 0001473844    
Document Fiscal Year Focus 2025    
Document Fiscal Period Focus FY    
Amendment Flag false