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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Loan modifications (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($)
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Term	$ 4
Combination	250
Total Modification	254
Commercial real estate
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Combination	247
Total Modification	247
Consumer
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Term	4
Combination	3
Total Modification	$ 7

X

- Definition

Represents the amount of loan restructuring modification combination, 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 amount of loan restructuring modification term, during the indicated time period.

+ References

No definition available.

+ Details

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

X

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

X

- Definition

Amount of financing receivable modified on trial basis.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialRealEstatePortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: