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Commitments and Credit Risk - Lines of Credit (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Commitments and Credit Risk |  |
Letters of credit outstanding, amount | $ 16.7 | $ 13.4
Commercial lines of credit |  |
Commitments and Credit Risk |  |
Letters of credit outstanding, amount | 1,800.0 | 1,300.0
Open-end consumer lines of credit |  |
Commitments and Credit Risk |  |
Letters of credit outstanding, amount | $ 199.2 | $ 175.7

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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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_VariableInterestEntityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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: |