Document and Entity Information - $ / shares		6 Months Ended
	Feb. 07, 2020	Dec. 31, 2019
Details
Registrant CIK		0000916907
Fiscal Year End		--06-30
Registrant Name		SOUTHERN MISSOURI BANCORP, INC.
SEC Form		10-Q
Period End date		Dec. 31, 2019
Trading Symbol		SMBC
Trading Exchange		NASDAQ
Tax Identification Number (TIN)		43-1665523
Number of common stock shares outstanding	9,210,789
Filer Category		Accelerated Filer
Current with reporting		Yes
Interactive Data Current		Yes
Shell Company		false
Small Business		false
Emerging Growth Company		false
Entity File Number		0-23406
Entity Incorporation, State or Country Code		MO
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
Entity Listing, Par Value Per Share	$ 0.01
Amendment Flag		false
Document Fiscal Year Focus		2020
Document Fiscal Period Focus		Q2
Document Quarterly Report		true
Document Transition Report		false