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DERIVATIVES AND HEDGING ACTIVITIES - Cash Flow Hedges (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
	Mar. 02, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
DERIVATIVES AND HEDGING ACTIVITIES
Interest rate swap interest income		$ 2.0	$ 2.0	$ 6.1	$ 5.6
Non-interest income related to changes in the fair value of derivative		$ 0.0	$ 0.0	$ 0.0	$ 0.0
Non-interest income related to changes in the fair value of derivative	$ 45.9

X

- Definition

Represents the monetary amount of Interest Rate Swap Interest Income, during the indicated time period.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the monetary amount of Noninterest income related to changes in the fair value of derivative, during the indicated time period.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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

X

- Definition

The net cash outflow or inflow from derivative instruments during the period, which are classified as investing activities, excluding those designated as hedging instruments.

+ References

No definition available.

+ Details

Name:	us-gaap_PaymentsForProceedsFromDerivativeInstrumentInvestingActivities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration