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Loans and Allowance for Credit Losses - Financing Receivable, Troubled Debt Restructuring (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Interest Only |  | $ 1,768
Term | $ 4 | 21
Combination | 250 |
Total Modification | 254 | 1,789
Consumer |  |
Term | 4 | 21
Combination | 3 |
Total Modification | 7 | 21
Commercial Real Estate |  |
Interest Only |  | 1,768
Combination | 247 |
Total Modification | $ 247 | $ 1,768

X
- Definition Represents the monetary amount of Troubled Debt Restructuring Loans Interest Only, during the indicated time period. + References No definition available. + Details
Name: | gsbc_TroubledDebtRestructuringLoansInterestOnly
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 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
Name: | us-gaap_ClassOfFinancingReceivableTypeOfBorrowerAxis=us-gaap_ConsumerBorrowerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CommercialRealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |