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Commitments and Credit Risk - Outstanding Commitments to Originate Loans (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Commitments and Credit Risk
Outstanding commitments to originate loans	$ 46.6	$ 92.4

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- Definition

Represents the monetary amount of Outstanding commitments to originate loans, as of the indicated date.

+ References

No definition available.

+ Details

Name:	gsbc_OutstandingCommitmentsToOriginateLoans
Namespace Prefix:	gsbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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