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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Weighted Average Interest Rate on Loans Receivable (Details) | Mar. 31, 2021 | Dec. 31, 2020
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LOANS AND ALLOWANCE FOR CREDIT LOSSES |  |
Loans Receivable, Weighted Average Interest Rate | 4.30% | 4.29%

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- Definition Represents the Loans Receivable weighted average interest rate, as of the indicated date. + References No definition available. + Details
Name: | gsbc_LoansReceivableWeightedAverageInterestRate
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_LoansAndLeasesReceivableDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration