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Loans and Allowance for Credit Losses - Financing Receivable, Troubled Debt Restructuring (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Commercial business |  |  |
Combination |  | $ 22 |
Total Modification |  | 22 |
Consumer |  |  |
Term | $ 259 | 16 | $ 136
Combination | 11 | 1,951 |
Total Modification | 270 | 1,967 | 136
Newly Restructured Modified Loans |  |  |
Interest Only | 1,799 |  |
Term | 461 | 16 | 136
Combination | 145 | 3,562 |
Total Modification | 2,405 | 3,578 | $ 136
Commercial Real Estate |  |  |
Interest Only | 1,768 |  |
Combination |  | 559 |
Total Modification | 1,768 | 559 |
One- to four-family residential |  |  |
Interest Only | 31 |  |
Term | 202 |  |
Combination | 134 | 1,030 |
Total Modification | $ 367 | $ 1,030 |

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_CommercialBorrowerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfFinancingReceivableTypeOfBorrowerAxis=us-gaap_ConsumerBorrowerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfFinancingReceivableTypeOfBorrowerAxis=gsbc_NewlyRestructuredModifiedLoansMember
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: |

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