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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
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
OTHER REAL ESTATE OWNED AND REPOSSESSIONS |  |  |  |
Net gains on sales of other real estate owned and repossessions | $ (22) | $ (5) | $ (41) | $ (148)
Valuation write-downs |  |  | 82 | 23
Operating expenses, net of rental income | 84 | 89 | 222 | 438
Expenses on other real estate owned and repossessions | $ 62 | $ 84 | $ 263 | $ 313

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
- Definition Amount of expense recognized during the period for the foreclosure on real estate assets. + References No definition available. + Details
Name: | us-gaap_ForeclosedRealEstateExpense
Namespace Prefix: | us-gaap_
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