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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Financing Receivable, Troubled Debt Restructuring (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Interest Only |  |  | $ 1,768
Term | $ 236 | $ 4 | 257
Combination |  | 250 |
Total Modification | 236 | 254 | 2,025
Consumer |  |  |
Term | 79 | 4 | 100
Combination |  | 3 |
Total Modification | 79 | 7 | 100
Commercial Real Estate |  |  |
Interest Only |  |  | 1,768
Combination |  | 247 |
Total Modification |  | $ 247 | 1,768
One- to four-family residential |  |  |
Term | 157 |  | 157
Total Modification | $ 157 |  | $ 157

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- Definition Represents the monetary amount of Troubled Debt Restructuring Loans Interest Only, during the indicated time period. + References No definition available. + Details
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Namespace Prefix: | gsbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents the monetary amount of Troubled Debt Restructuring Loans Modified Combination, during the indicated time period. + References No definition available. + Details
Name: | gsbc_TroubledDebtRestructuringLoansModifiedCombination
Namespace Prefix: | gsbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the monetary amount of Troubled Debt Restructuring Loans Modified Term, during the indicated time period. + References No definition available. + Details
Name: | gsbc_TroubledDebtRestructuringLoansModifiedTerm
Namespace Prefix: | gsbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the monetary amount of Troubled Debt Restructurings Total New Modifications, during the indicated time period. + References No definition available. + Details
Name: | gsbc_TroubledDebtRestructuringsTotalNewModifications
Namespace Prefix: | gsbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=gsbc_OneToFourFamilyResidentialMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |