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Note 27: Condensed Parent Company Statements: Condensed Statement of Comprehensive Income -- Great Southern Bancorp, Inc. (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Unrealized Appreciation (Depreciation) on Available for Sale Securities, Net | $ (1,229) | $ (478) | $ (2,363)
Parent Company |  |  |
Net Comprehensive Income Parent Company | 67,109 | 51,564 | 45,342
Unrealized Appreciation (Depreciation) on Available for Sale Securities, Net | 0 | 0 | (158)
Reclassification adjustment for gains included in net income | 0 | 0 | (1,742)
Change in Fair Value of Cash Flow Hedge, Net | 0 | 161 | 87
Comprehensive Income of subsidiaries | 8,114 | (478) | (2,293)
Comprehensive Income parent | $ 75,223 | $ 51,247 | $ 41,236

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
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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
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Namespace Prefix: | fil_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Represents the monetary amount of Comprehensive Income parent, during the indicated time period. + References No definition available. + Details
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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
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X
- Definition Represents the monetary amount of Reclassification adjustment for gains included in net income, during the indicated time period. + References No definition available. + Details
Name: | fil_ReclassificationAdjustmentForGainsIncludedInNetIncome
Namespace Prefix: | fil_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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X
- Definition Represents the monetary amount of Unrealized depreciation on available-for-sale securities, net of taxes (credit) of $(352), $(272) and $(1,346) for 2018, 2017 and 2016, respectively, during the indicated time period. + References No definition available. + Details
Name: | fil_UnrealizedAppreciationDepreciationOnAvailableForSaleSecuritiesNet
Namespace Prefix: | fil_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |