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SECURITIES SOLD UNDER REVERSE REPURCHASE AGREEMENTS AND SHORT-TERM BORROWINGS - Schedule of Short-term Debt (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
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SECURITIES SOLD UNDER REVERSE REPURCHASE AGREEMENTS AND SHORT-TERM BORROWINGS |  |
Notes payable - Community Development Equity Funds | $ 1,610 | $ 1,083
Securities sold under reverse repurchase agreements | 58,172 | 176,843
Overnight borrowings from the Federal Home Loan Bank | 82,500 | 88,500
Short-term debt recorded value | $ 142,282 | $ 266,426

X
- Definition Amount of Overnight advances from the Federal Home Loan Bank (FHLB). + References No definition available. + Details
Name: | gsbc_FederalHomeLoanBankAdvancesBranchOfFhlbBankAmountOfOvernightAdvances
Namespace Prefix: | gsbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the monetary amount of Notes payable - Community Development Equity Funds, as of the indicated date. + References No definition available. + Details
Name: | gsbc_NotesPayableCommunityDevelopmentEquityFunds
Namespace Prefix: | gsbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the value of securities sold in the reverse repurchase agreement. + References No definition available. + Details
Name: | gsbc_SaleOfSecuritiesUnderReverseRepurchaseAgreements
Namespace Prefix: | gsbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the monetary amount of Short-term debt recorded value, as of the indicated date. + References No definition available. + Details
Name: | gsbc_ShortTermDebtRecordedValue
Namespace Prefix: | gsbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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