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Represents the monetary amount of Actual Amortization of Investment in Limited Partnerships For Federal Or Historic Tax Credits.

No definition available.

Name:	gsbc_ActualAmortizationOfInvestmentInLimitedPartnershipsForFederalOrHistoricTaxCredits
Namespace Prefix:	gsbc_
Data Type:	xbrli:monetaryItemType
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Represents the Community Development Entities, Minimum Period Before Redemption.

No definition available.

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Represents the credit allowance period.

No definition available.

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Represents the credit allowance period for federal rehabilitation/historic tax credits

No definition available.

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Represents the monetary amount of Investments in Community Development Entities Net Carrying Amount, as of the indicated date.

No definition available.

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Investments In Limited Partnerships For Federal Or Historic Tax Credits

No definition available.

Name:	gsbc_InvestmentsInLimitedPartnershipsForFederalOrHistoricTaxCredits
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Data Type:	xbrli:monetaryItemType
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Represents the percentage of investments, that are allowed on the credit allowance period.

No definition available.

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The amount of reduction of Investment in Community Development Entities Federal New Market Tax Credits, as of the indicated date.

No definition available.

Name:	gsbc_ReductionInInvestmentInCommunityDevelopmentEntitiesFederalNewMarketTaxCredits
Namespace Prefix:	gsbc_
Data Type:	xbrli:monetaryItemType
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Represents the monetary amount of reduction in retained earnings due to investment in limited partnerships for historic tax credits.

No definition available.

Name:	gsbc_ReductionInRetainedEarningsDueToInvestmentsInLimitedPartnershipsForHistoricTaxCredits
Namespace Prefix:	gsbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Represents the monetary amount of Usage of Investment in Community Development Entities Federal New Market Tax Credits, as of the indicated date.

No definition available.

Name:	gsbc_UsageOfInvestmentInCommunityDevelopmentEntitiesFederalNewMarketTaxCredits
Namespace Prefix:	gsbc_
Data Type:	xbrli:monetaryItemType
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Period Type:	duration

Represents the monetary amount of Usage of Investment in Limited Partnerships For Federal Or Historic Tax Credits.

No definition available.

Name:	gsbc_UsageOfInvestmentsInLimitedPartnershipsForFederalOrHistoricTaxCredits
Namespace Prefix:	gsbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 20
-Name Accounting Standards Codification
-Section 40
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481628/310-20-40-7

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481990/310-10-45-2

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