CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Unrealized appreciation (depreciation) on available-for-sale securities, net of taxes (credit)	$ (5,420)	$ (6,884)	$ (5,327)	$ (17,965)
Unrealized (gain) loss on securities transferred to held-to-maturity, net of taxes (credit)	(13)	(65)	(30)	9
Reclassification adjustment for gains included in net income, net of taxes	0	(7)	0	(9)
Amortization of realized gain on termination of cash flow hedge, net of taxes (credit)	(468)	(467)	(1,387)	(1,385)
Change in value of active cash flow hedges, net of taxes (credit)	$ (832)	$ (5,876)	$ (758)	$ (7,553)

The amount of tax effect (credit) on amortization of realized gain on termination of cash flow hedge, during the indicated time period.

No definition available.

Name:	gsbc_TaxEffectCreditOnAmortizationOfRealizedGainOnTerminationOfCashFlowHedge
Namespace Prefix:	gsbc_
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The amount of tax effect of change in fair value of cash flow hedge taxes, during the indicated time period.

No definition available.

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

The amount of tax effect of unrealized appreciation (depreciation) on available for sale securities taxes (credit), during the indicated time period.

No definition available.

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

The amount of tax effect of unrealized gain on securities transferred to held-to-maturity, during the indicated time period.

No definition available.

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

The amount of tax effect reclassification adjustment for gains included in net income taxes (credit) taxes, during the indicated time period.

No definition available.

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

No definition available.

Name:	us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract
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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration