Note 25: Regulatory Matters: Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Total risk-based capital \| Great Southern Bancorp, Inc.
Actual Capital Amount	$ 556,106	$ 452,637
Actual Capital Ratio	13.60%	12.60%
Capital Required for Capital Adequacy	$ 327,610	$ 288,279
Capital Required for Capital Adequacy to Risk Weighted Assets	8.00%	8.00%
Capital Required to be Well Capitalized
Capital Required to be Well Capitalized to Risk Weighted Assets
Total risk-based capital \| Great Southern Bank
Actual Capital Amount	$ 520,989	$ 434,334
Actual Capital Ratio	12.70%	12.10%
Capital Required for Capital Adequacy	$ 327,505	$ 288,180
Capital Required for Capital Adequacy to Risk Weighted Assets	8.00%	8.00%
Capital Required to be Well Capitalized	$ 409,382	$ 360,225
Capital Required to be Well Capitalized to Risk Weighted Assets	10.00%	10.00%
Tier I risk-based capital \| Great Southern Bancorp, Inc.
Actual Capital Amount	$ 443,706	$ 414,488
Actual Capital Ratio	10.80%	11.50%
Capital Required for Capital Adequacy	$ 245,707	$ 216,209
Capital Required for Capital Adequacy to Risk Weighted Assets	6.00%	6.00%
Capital Required to be Well Capitalized
Capital Required to be Well Capitalized to Risk Weighted Assets
Tier I risk-based capital \| Great Southern Bank
Actual Capital Amount	$ 483,589	$ 396,185
Actual Capital Ratio	11.80%	11.00%
Capital Required for Capital Adequacy	$ 245,629	$ 216,135
Capital Required for Capital Adequacy to Risk Weighted Assets	6.00%	6.00%
Capital Required to be Well Capitalized	$ 327,505	$ 288,180
Capital Required to be Well Capitalized to Risk Weighted Assets	8.00%	8.00%
Tier I leverage capital \| Great Southern Bancorp, Inc.
Actual Capital Amount	$ 443,706	$ 414,488
Actual Capital Ratio	9.90%	10.20%
Capital Required for Capital Adequacy	$ 178,693	$ 162,576
Capital Required for Capital Adequacy to Risk Weighted Assets	4.00%	4.00%
Capital Required to be Well Capitalized
Capital Required to be Well Capitalized to Risk Weighted Assets
Tier I leverage capital \| Great Southern Bank
Actual Capital Amount	$ 483,589	$ 396,185
Actual Capital Ratio	10.80%	9.80%
Capital Required for Capital Adequacy	$ 178,643	$ 161,986
Capital Required for Capital Adequacy to Risk Weighted Assets	4.00%	4.00%
Capital Required to be Well Capitalized	$ 223,304	$ 202,482
Capital Required to be Well Capitalized to Risk Weighted Assets	5.00%	5.00%
Capital Equity Tier I Capital \| Great Southern Bancorp, Inc.
Actual Capital Amount	$ 418,687	$ 389,460
Actual Capital Ratio	10.20%	10.80%
Capital Required for Capital Adequacy	$ 184,280	$ 162,157
Capital Required for Capital Adequacy to Risk Weighted Assets	4.50%	4.50%
Capital Required to be Well Capitalized
Capital Required to be Well Capitalized to Risk Weighted Assets
Capital Equity Tier I Capital \| Great Southern Bank
Actual Capital Amount	$ 483,569	$ 396,157
Actual Capital Ratio	11.80%	11.00%
Capital Required for Capital Adequacy	$ 184,222	$ 162,101
Capital Required for Capital Adequacy to Risk Weighted Assets	4.50%	4.50%
Capital Required to be Well Capitalized	$ 266,098	$ 234,146
Capital Required to be Well Capitalized to Risk Weighted Assets	6.50%	6.50%

Represents the monetary amount of Actual Capital Amount, as of the indicated date.

No definition available.

Name:	fil_ActualCapitalAmount
Namespace Prefix:	fil_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Represents the Actual Capital Ratio, as of the indicated date.

+ References

No definition available.

+ Details

Name:	fil_ActualCapitalRatio
Namespace Prefix:	fil_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The minimum amount of Total Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1H
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826

+ Details

Name:	us-gaap_CapitalRequiredForCapitalAdequacy
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The minimum Total risk based capital ratio (total capital divided by risk weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1H
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958570-112826

+ Details

Name:	us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The amount of Total Capital required to be categorized as well as capitalized under the regulatory framework for prompt corrective action.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826

+ Details

Name:	us-gaap_CapitalRequiredToBeWellCapitalized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The Total risk based capital ratio (total capital divided by risk weighted assets) required to be categorized as "well capitalized", in the regulatory framework for prompt corrective action.

+ References

+ Details

Name:	us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	fil_RegulatoryCapitalRequirementsUnderBankingRegulationsAxis=fil_TotalRiskBasedCapitalMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=fil_GreatSouthernBancorpIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=fil_GreatSouthernBankMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	fil_RegulatoryCapitalRequirementsUnderBankingRegulationsAxis=fil_TierIRiskBasedCapitalMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	fil_RegulatoryCapitalRequirementsUnderBankingRegulationsAxis=fil_TierILeverageCapitalMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	fil_RegulatoryCapitalRequirementsUnderBankingRegulationsAxis=fil_CapitalEquityTierICapitalMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: