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Stock Compensation Plans - Nonvested Options Granted Unrecognized Compensation Cost (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)
Stock Compensation Plans
Nonvested Options Granted Unrecognized Compensation Costs	$ 4.6

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- Definition

Represents the monetary amount of Nonvested Options Granted Unrecognized Compensation Costs, as of the indicated date.

+ References

No definition available.

+ Details

Name:	gsbc_NonvestedOptionsGrantedUnrecognizedCompensationCosts
Namespace Prefix:	gsbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

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