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Loans and Allowance for Loan Losses - Troubled Debt Restructured Loans Returned to Accrual Status (Details) | 12 Months Ended
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Dec. 31, 2019 USD ($)
One- to four-family residential |
Troubled Debt Restructurings Returned to Accrual Status | $ 372,000

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- Definition Represents the monetary amount of Troubled Debt Restructurings Returned to Accrual Status, during the indicated time period. + References No definition available. + Details
Name: | gsbc_TroubledDebtRestructuringsReturnedToAccrualStatus
Namespace Prefix: | gsbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=gsbc_OneToFourFamilyResidentialMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |