Note 14: Stockholders' Equity and Regulatory Capital: Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Jun. 30, 2017
Total Capital (to Risk-Weighted Assets) \| Consolidated
Capital	$ 222,133	$ 194,322
Capital to Risk Weighted Assets	13.53%	12.84%
Capital Required for Capital Adequacy	$ 131,335	$ 121,086
Capital Required for Capital Adequacy to Risk Weighted Assets	8.00%	8.00%
Total Capital (to Risk-Weighted Assets) \| Southern Bank
Capital	$ 214,804	$ 183,906
Capital to Risk Weighted Assets	13.18%	12.15%
Capital Required for Capital Adequacy	$ 130,337	$ 121,118
Capital Required for Capital Adequacy to Risk Weighted Assets	8.00%	8.00%
Capital Required to be Well Capitalized	$ 162,921	$ 151,397
Capital Required to be Well Capitalized to Risk Weighted Assets	10.00%	10.00%
Tier I Capital (to Risk-Weighted Assets) \| Consolidated
Capital	$ 202,756	$ 177,679
Capital to Risk Weighted Assets	12.35%	11.74%
Capital Required for Capital Adequacy	$ 98,501	$ 90,815
Capital Required for Capital Adequacy to Risk Weighted Assets	6.00%	6.00%
Tier I Capital (to Risk-Weighted Assets) \| Southern Bank
Capital	$ 195,427	$ 167,263
Capital to Risk Weighted Assets	12.00%	11.05%
Capital Required for Capital Adequacy	$ 97,753	$ 90,838
Capital Required for Capital Adequacy to Risk Weighted Assets	6.00%	6.00%
Capital Required to be Well Capitalized	$ 130,337	$ 121,118
Capital Required to be Well Capitalized to Risk Weighted Assets	8.00%	8.00%
Tier I Capital (to Average Assets) \| Consolidated
Capital	$ 202,756	$ 177,679
Capital to Risk Weighted Assets	10.97%	11.66%
Capital Required for Capital Adequacy	$ 73,932	$ 60,975
Capital Required for Capital Adequacy to Risk Weighted Assets	4.00%	4.00%
Tier I Capital (to Average Assets) \| Southern Bank
Capital	$ 195,427	$ 167,263
Capital to Risk Weighted Assets	10.60%	10.98%
Capital Required for Capital Adequacy	$ 73,721	$ 60,949
Capital Required for Capital Adequacy to Risk Weighted Assets	4.00%	4.00%
Capital Required to be Well Capitalized	$ 92,152	$ 76,187
Capital Required to be Well Capitalized to Risk Weighted Assets	5.00%	5.00%
Common Equity Tier I Capital (to Risk-Weighted Assets) \| Consolidated
Capital	$ 188,416	$ 163,626
Capital to Risk Weighted Assets	11.48%	10.81%
Capital Required for Capital Adequacy	$ 73,876	$ 68,111
Capital Required for Capital Adequacy to Risk Weighted Assets	4.50%	4.50%
Common Equity Tier I Capital (to Risk-Weighted Assets) \| Southern Bank
Capital	$ 195,427	$ 167,263
Capital to Risk Weighted Assets	12.00%	11.05%
Capital Required for Capital Adequacy	$ 73,315	$ 68,129
Capital Required for Capital Adequacy to Risk Weighted Assets	4.50%	4.50%
Capital Required to be Well Capitalized	$ 105,899	$ 98,408
Capital Required to be Well Capitalized to Risk Weighted Assets	6.50%	6.50%

The amount of total capital as defined in the regulations.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6490092&loc=d3e47304-110998

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1H
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=6490092&loc=d3e47080-110998

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1H
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826

+ Details

Name:	us-gaap_Capital
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1H
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=84167132&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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958570-112826

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1H
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826

+ 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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=84167132&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

- Definition

Total Capital divided by risk weighted assets as defined in the regulations.

+ References

+ Details

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

- Details

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

- Details

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

- Details

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

- Details

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

- Details

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

- Details

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