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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		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
OTHER REAL ESTATE OWNED AND REPOSSESSIONS
Net loss (gain) on sales of other real estate owned and repossessions	$ (7)	$ (459)	$ (1)	$ (491)
Operating expenses (income), net of rental income	(135)	(77)	(379)	301
Expenses on other real estate owned and repossessions	$ (142)	$ (536)	$ (380)	$ (190)

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

- References

No definition available.

+ Details

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