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SECURITIES SOLD UNDER REVERSE REPURCHASE AGREEMENTS AND SHORT-TERM BORROWINGS - Schedule of Short-term Debt (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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SECURITIES SOLD UNDER REVERSE REPURCHASE AGREEMENTS AND SHORT-TERM BORROWINGS |  |
Notes payable - Community Development Equity Funds | $ 1,183 | $ 1,518
Securities sold under reverse repurchase agreements | 158,367 | 164,174
Short-term debt recorded value | $ 159,550 | $ 165,692

X
- Definition Represents the monetary amount of Notes payable - Community Development Equity Funds, as of the indicated date. + References No definition available. + Details
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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

X
- Definition The carrying value of securities purchased to be resold in reverse repurchase transactions as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_SecuritiesForReverseRepurchaseAgreements
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant