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Note 26: Condensed Parent Company Statements: Condensed Statement of Comprehensive Income -- Great Southern Bancorp, Inc. (Details) - Parent Company - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net Comprehensive Income Parent Company	$ 73,612	$ 67,109	$ 51,564
Change in Fair Value of Cash Flow Hedge, Net	0	0	161
Comprehensive Income of subsidiaries	22,619	8,114	(478)
Comprehensive Income parent	$ 96,231	$ 75,223	$ 51,247

X

- Definition

Represents the monetary amount of Change in Fair Value of Cash Flow Hedge, Net, during the indicated time period.

+ References

No definition available.

+ Details

Name:	fil_ChangeInFairValueOfCashFlowHedgeNet
Namespace Prefix:	fil_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Represents the monetary amount of Comprehensive Income of subsidiaries, during the indicated time period.

+ References

No definition available.

+ Details

Name:	fil_ComprehensiveIncomeOfSubsidiaries
Namespace Prefix:	fil_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents the monetary amount of Comprehensive Income parent, during the indicated time period.

+ References

No definition available.

+ Details

Name:	fil_ComprehensiveIncomeParent
Namespace Prefix:	fil_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents the monetary amount of Net Comprehensive Income Parent Company, during the indicated time period.

+ References

No definition available.

+ Details

Name:	fil_NetComprehensiveIncomeParentCompany
Namespace Prefix:	fil_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	srt_ConsolidatedEntitiesAxis=srt_ParentCompanyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: