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ADVANCES FROM FEDERAL HOME LOAN BANK (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Advances from Federal Home Loan Banks | $ 0 | $ 0
Federal Home Loan Bank of Des Moines |  |
Long-term line of credit |  | $ 0

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

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- Definition Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
Name: | us-gaap_AdvancesFromFederalHomeLoanBanks
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | srt_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis=srt_FederalHomeLoanBankOfDesMoinesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |