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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
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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: |