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Income Taxes - Additional Information (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Income Taxes |  |
Retained earnings for which no deferred income tax liability had been recognized | $ 17.5 | $ 17.5
Unrecorded deferred income tax liability | $ 3.9 | $ 3.9

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- Definition Represents the amount of retained earnings for which no deferred income tax liability had been recognized. + References No definition available. + Details
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Namespace Prefix: | gsbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Represents the amount of unrecorded deferred income tax liability. + References No definition available. + Details
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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_IncomeTaxDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration