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SHORT-TERM BORROWINGS - Schedule of Short-term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
SHORT-TERM BORROWINGS
Notes payable - Community Development Equity Funds	$ 660	$ 928
Securities sold under reverse repurchase agreements	37,198	48,467
Overnight borrowings from the Federal Home Loan Bank	470,000	330,000
Short-term debt recorded value	$ 507,858	$ 379,395

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