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PREMISES AND EQUIPMENT - Calculated Amount of Right of Use Assets and Lease Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Operating leases liability	$ 8,098		$ 8,098		$ 8,700
Statement of Financial Condition
Operating leases right of use asset	7,937	$ 8,758	7,937	$ 8,758
Operating leases liability	8,098	8,869	8,098	8,869
Statement of Income
Operating lease costs classified as occupancy and equipment expense	386	397	1,153	1,182
Supplemental Cash Flow Information
Operating cash flows from operating leases	375	$ 391	1,117	1,149
Operating leases	$ 74		$ 74	$ 972

X

- Definition

Represents the monetary amount of Operating Cash Flows from Operating Leases, 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 Operating Lease Costs Classified as Occupancy and Equipment Expense, during the indicated time period.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the monetary amount of Operating leases, during the indicated time period.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the monetary amount of Right of Use Asset, Operating Leases, during the indicated time period.

+ References

No definition available.

+ Details

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

X

- Definition

Present value of lessee's discounted obligation for lease payments from operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	gsbc_StatementOfFinancialPositionAxis=gsbc_StatementOfIncomeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	gsbc_StatementOfFinancialPositionAxis=gsbc_SupplementalCashFlowInformationMember
Namespace Prefix:
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