Represents the amount of interest income (expense) on interest rate swap.

No definition available.

Name:	gsbc_DerivativeInterestRateSwapInterestIncomeExpense
Namespace Prefix:	gsbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Represents the amount of interest income on terminated interest rate swap.

+ References

No definition available.

+ Details

Name:	gsbc_DerivativeInterestRateSwapTerminatedInterestIncome
Namespace Prefix:	gsbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of terminated value of derivatives.

+ References

No definition available.

+ Details

Name:	gsbc_DerivativeTerminationNotionalAmount
Namespace Prefix:	gsbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of interest income expected upon termination of a derivative contract.

+ References

No definition available.

+ Details

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Namespace Prefix:	gsbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

It represents the amount of non interest income changes in fair value.

+ References

No definition available.

+ Details

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Namespace Prefix:	gsbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The percentage of USD-prime rate.

+ References

No definition available.

+ Details

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Namespace Prefix:	gsbc_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The percentage of USD-SOFR OIS rate.

+ References

No definition available.

+ Details

Name:	gsbc_UsdSofrOisRate
Namespace Prefix:	gsbc_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Fixed interest rate related to the interest rate derivative.

+ References

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-Section 50
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+ Details

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Data Type:	dtr-types:percentItemType
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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Balance Type:	na
Period Type:	duration

- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

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

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember
Namespace Prefix:
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- Details

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- Details

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Period Type:

- Details

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Period Type:

- Details

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DERIVATIVES AND HEDGING ACTIVITIES - Cash Flow Hedges (Details) - USD ($)	1 Months Ended	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Jul. 31, 2022	Oct. 31, 2018
Derivatives and Hedging Activities
USD-Prime rate				6.75%
USD-SOFR OIS rate				3.63179%
Non-interest income related to changes in the fair value		$ 0	$ 0	$ 0	$ 0
Interest rate swaps \| Cash flow hedges
Derivatives and Hedging Activities
Total notional amount of the swaps							$ 400,000,000
Derivative, fixed interest rate							3.018%
Terminated notional amount of derivatives	$ 400,000,000
Expected interest income on termination	$ 45,900,000
Loan interest income on terminated interest rate swap			2,000,000		4,000,000
Interest rate swap one \| Cash flow hedges
Derivatives and Hedging Activities
Total notional amount of the swaps						$ 200,000,000
Derivative, fixed interest rate						2.628%
Interest rate swap two \| Cash flow hedges
Derivatives and Hedging Activities
Total notional amount of the swaps						$ 200,000,000
Derivative, fixed interest rate						5.725%
July 2022 interest rate swaps \| Cash flow hedges
Derivatives and Hedging Activities
Loan interest income expense		$ 1,000,000	$ 1,800,000	$ 2,100,000	$ 3,500,000