Amount of interest income expected upon termination of a derivative contract.

No definition available.

Name:	gsbc_DerivativeTerminationValueExpectedInterestIncome
Namespace Prefix:	gsbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

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

- 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

- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeFixedInterestRate
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis=us-gaap_CashFlowHedgingMember
Namespace Prefix:
Data Type:	na
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Period Type:

Derivatives and Hedging Activities - Cash Flow Hedges (Details) - USD ($) $ in Millions		12 Months Ended
	Mar. 02, 2020	Dec. 31, 2021	Dec. 31, 2020	Oct. 31, 2018
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Non-interest income related to changes in the fair value of derivative	$ 45.9
Interest Rate Swap \| Cash flow hedges
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount of derivatives				$ 400.0
Derivative, fixed interest rate				3.018%
Expected interest income on termination	$ 2.0
Interest Rate Swap Interest Income		$ 8.1	$ 7.7