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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
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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