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Commitments and Credit Risk - Mortgage Loans in Process of Origination (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Commitments and Credit Risk
Mortgage loans in the process of origination	$ 85.9	$ 69.3

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- Definition

Represents the monetary amount of Mortgage loans in the process of origination, as of the indicated date.

+ References

No definition available.

+ Details

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

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- References

No definition available.

+ Details

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