Represents number of interest rate swaps associated with participation loans.

No definition available.

Name:	gsbc_NumberOfInterestRateSwapsAssociatedWithParticipationLoans
Namespace Prefix:	gsbc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of participation loans purchased during the period.

+ References

No definition available.

+ Details

Name:	gsbc_NumberOfParticipationLoansPurchased
Namespace Prefix:	gsbc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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+ Details

Name:	us-gaap_DerivativeNotionalAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Definition

Total amount of gain (loss) derived from fair value hedges recognized in earnings in the period.

+ References

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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Number of interest rate derivative instruments held by the entity at the reporting date.

+ References

+ Details

Name:	us-gaap_NumberOfInterestRateDerivativesHeld
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

The aggregate amount of the participating mortgage obligation at the end of the accounting period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 470
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_HedgingDesignationAxis=us-gaap_NondesignatedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MajorCustomersAxis=gsbc_CommercialCustomersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateContractMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MajorCustomersAxis=gsbc_ThirdPartiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

DERIVATIVES AND HEDGING ACTIVITIES - Non-designated Hedges and Fair value hedges (Details) - Nondesignated Hedges	3 Months Ended		6 Months Ended
	Jun. 30, 2026 USD ($) contract loan item	Jun. 30, 2025 USD ($)	Jun. 30, 2026 USD ($) contract loan item	Jun. 30, 2025 USD ($)	Dec. 31, 2025 USD ($) item contract loan
Derivatives and Hedging Activities
Gains (losses) on fair value hedges recognized in earnings	$ 5,000	$ (28,000)	$ 3,000	$ (52,000)
Commercial customers
Derivatives and Hedging Activities
Total notional amount of the swaps	125,000,000		125,000,000		$ 114,400,000
Interest rate contract \| Third parties
Derivatives and Hedging Activities
Total notional amount of the swaps	$ 125,000,000		$ 125,000,000		$ 114,400,000
Interest rate swaps
Derivatives and Hedging Activities
Number of interest rate derivatives held \| contract	8		8		6
Number of participation loans purchased \| loan	2		2		1
Number of interest rate swaps associated with participation loans \| item	2		2		1
Participating mortgage loans, mortgage obligations amount	$ 5,200,000		$ 5,200,000		$ 199,000
Interest rate swaps \| Third parties
Derivatives and Hedging Activities
Number of interest rate derivatives held \| contract	8		8		6