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Commitments and Credit Risk - Mortgage Loans in Process of Origination (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Commitments and Credit Risk |  |
Mortgage loans in the process of origination | $ 53.5 | $ 85.9

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- Definition Represents the monetary amount of Mortgage loans in the process of origination, as of the indicated date. + References No definition available. + Details
Name: | gsbc_MortgageLoansInProcessOfOrigination
Namespace Prefix: | gsbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration