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

Amount of amortization of investments in limited partnerships for federal rehabilitation or historic tax credits.

No definition available.

Name:	gsbc_AmortizationOfInvestmentsInLimitedPartnershipsForFederalRehabilitationOrHistoricTaxCredits
Namespace Prefix:	gsbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Represents the Community Development Entities, Minimum Period Before Redemption.

No definition available.

Name:	gsbc_CommunityDevelopmentEntitiesMinimumPeriodBeforeRedemption
Namespace Prefix:	gsbc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Represents the credit allowance period.

No definition available.

Name:	gsbc_CreditAllowancePeriod
Namespace Prefix:	gsbc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

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

No definition available.

Name:	gsbc_CreditAllowancePeriodForFederalRehabilitationHistoricTaxCredits
Namespace Prefix:	gsbc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

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

No definition available.

Name:	gsbc_InvestmentsInCommunityDevelopmentEntitiesNetCarryingAmount
Namespace Prefix:	gsbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Investments In Limited Partnerships For Federal Or Historic Tax Credits

No definition available.

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

Represents the percentage of investments, that are allowed on the credit allowance period.

No definition available.

Name:	gsbc_PercentageOfInvestmentCreditAllowancePeriod
Namespace Prefix:	gsbc_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

Represents the monetary amount of reduction in retained earnings due to investment in community development entities.

No definition available.

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

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 invested in certain limited partnerships for federal rehabilitation or historic tax credits.

No definition available.

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

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