Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2022	Sep. 09, 2022	Dec. 31, 2021
Cover [Abstract]
Document Type	10-K/A
Document Annual Report	true
Document Transition Report	false
Period End date	Jun. 30, 2022
Registrant CIK	0000916907
Entity File Number	0-23406
Registrant Name	SOUTHERN MISSOURI BANCORP, INC.
Entity Incorporation, State or Country Code	MO
Tax Identification Number (TIN)	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
Trading Exchange	NASDAQ
Voluntary filer	No
Well-known Seasoned Issuer	No
Current reporting status	Yes
Interactive Data Current	Yes
Filer Category	Accelerated Filer
Small Business	false
Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Shell Company	false
Number of common stock shares outstanding		9,229,151
Fiscal Year End	--06-30
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	FY
Amendment Flag	true
Public Float			$ 401.6
Amendment Description	The sole purpose of this Amendment No. 1 on Form 10-K/A to our Annual Report on Form 10-K for the fiscal year ended June 30, 2022, is to update the Report of the Independent Registered Public Accounting Firm contained in Item 8 to address the adoption of ASU 2016-13, “Financial Instruments – Credit Losses,” also known as the current expected credit loss (“CECL”) standard, which was effective for the Company as of July 1, 2020. Reference to the new accounting standard was inadvertently omitted from the report filed with the original Form 10-K.  Other than the inclusion with this Amendment No. 1 of new certifications required by Rules 13a-14(a) and 13a-14(b) under the Securities Exchange Act of 1934, as amended, and an updated list of exhibits in Item 15, this Amendment No. 1 does not modify or update any other disclosures contained in our original Annual Report on Form 10-K for the fiscal year ended June 30, 2022.
Auditor Name	FORVIS
Auditor Firm ID	686
Auditor Location	Decatur, Illinois