Document and Entity Information - shares	3 Months Ended
	Jun. 30, 2017	Aug. 03, 2017
Document and Entity Information:
Entity Registrant Name	Great Southern Bancorp Inc
Document Type	10-Q
Document Period End Date	Jun. 30, 2017
Trading Symbol	gsbc
Amendment Flag	false
Entity Central Index Key	0000854560
Current Fiscal Year End Date	--12-31
Entity Common Stock, Shares Outstanding		14,036,528
Entity Filer Category	Accelerated Filer
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	No
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q2