Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Consolidated Statements of Comprehensive Income
Unrealized appreciation (depreciation) on available-for-sale securities, net of taxes (credit)	$ (1,846)	$ 2,199	$ (18,106)
Unrealized loss on securities transferred to held-to-maturity, net of taxes	(48)	(45)	29
Reclassification adjustment for loss included in net income, net of taxes (credit)	0	0	32
Amortization of realized loss on termination of cash flow hedge, net of taxes	(1,859)	(1,855)	(1,852)
Change in value of active cash flow hedges, net of taxes (credit)	$ 69	$ 3,441	$ (7,695)

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_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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.

Name:	gsbc_TaxEffectOnUnrealizedGainOrLosOnSecuritiesTransferredToHeldToMaturity
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
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration