Document and Entity Information (USD $)	12 Months Ended
	Jun. 30, 2012	Sep. 07, 2012	Dec. 31, 2011
Document and Entity Information:
Entity Registrant Name	Southern Missouri Bancorp Inc
Document Type	10-K
Document Period End Date	Jun. 30, 2012
Amendment Flag	false
Entity Central Index Key	0000916907
Current Fiscal Year End Date	--06-30
Entity Common Stock, Shares Outstanding		3,289,040
Entity Public Float			$ 63,300,000
Entity Filer Category	Smaller Reporting Company
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	No
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	FY