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Income Taxes - Additional information (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Income Taxes
Retained earnings for which no deferred income tax liability had been recognized	$ 17.5	$ 17.5
Unrecorded deferred income tax liability	$ 4.3	$ 4.3

X

- Definition

Represents the amount of retained earnings for which no deferred income tax liability had been recognized.

+ References

No definition available.

+ Details

Name:	gsbc_RetainedEarningsWithNoDeferredIncomeTaxLiabilityRecognized
Namespace Prefix:	gsbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents the amount of unrecorded deferred income tax liability.

+ References

No definition available.

+ Details

Name:	gsbc_UnrecordedDeferredIncomeTaxLiability
Namespace Prefix:	gsbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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