Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2024	Sep. 08, 2024	Dec. 31, 2023
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Transition Report	false
Document Period End Date	Jun. 30, 2024
Entity Central Index Key	0000916907
Securities Act File Number	0-23406
Entity Registrant Name	SOUTHERN MISSOURI BANCORP, INC.
Entity Incorporation, State or Country Code	MO
Entity Tax Identification Number	43-1665523
Entity Address, Address Line One	2991 Oak Grove Road
Entity Address, City or Town	Poplar Bluff
Entity Address, State or Province	MO
Entity Address, Postal Zip Code	63901
City Area Code	573
Local Phone Number	778-1800
Title of 12(b) Security	Common Stock
Trading Symbol	SMBC
Security Exchange Name	NASDAQ
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		11,277,737
Current Fiscal Year End Date	--06-30
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Public Float			$ 356.8
Auditor Name	Forvis Mazars, LLP
Auditor Firm ID	686
Auditor Location	Springfield, Missouri