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Commitments and Credit Risk - Lines of Credit (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Letters of Credit Outstanding, Amount | $ 13.4 | $ 16.1
Commercial Lines of Credit |  |
Letters of Credit Outstanding, Amount | 1,300.0 | 1,000.0
Open-end Consumer Lines of Credit |  |
Letters of Credit Outstanding, Amount | $ 175.7 | $ 164.5

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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