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Deposits - Weighted Average Interest Rate on Certificates of Deposit (Details) | Dec. 31, 2020 | Dec. 31, 2019
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Deposits |  |
Weighted average interest rate on certificates of deposit | 1.00% | 2.09%

X
- Definition Represents the Weighted average interest rate on certificates of deposit, as of the indicated date. + References No definition available. + Details
Name: | gsbc_WeightedAverageInterestRateOnCertificatesOfDeposit
Namespace Prefix: | gsbc_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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