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OTHER REAL ESTATE OWNED AND REPOSSESSIONS - Expenses applicable to other real estate owned and repossessions (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
OTHER REAL ESTATE OWNED AND REPOSSESSIONS
Net gains on sales of other real estate owned and repossessions	$ 1	$ 5
Valuation write-downs	4
Operating expenses (income), net of rental income	49	(75)
Expenses on other real estate owned and repossessions	$ 54	$ (70)

X

- Definition

Amount of expenses (income) recognized during the period for the foreclosure on real estate assets.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the monetary amount of Net (gain) loss on sales of other real estate owned, during the indicated time period.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the monetary amount of Operating expenses, net of rental income, during the indicated time period.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the monetary amount of Valuation write-downs on foreclosed assets, during the indicated time period.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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