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Other Real Estate Owned and Repossessions (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Valuation write-downs	$ 211,000	$ 1,320,000	$ 926,000
Operating leases right of use asset	7,715,000	8,536,000
Lease liability	7,886,000	8,661,000
Former branch
Amount of one former branch location	1,200,000	80,000
Valuation write-downs	0	286,000
Residential Mortgage
Mortgage Loans in Process of Foreclosure, Amount	125,000	602,000
Acquired Loans | Residential Mortgage
Mortgage Loans in Process of Foreclosure, Amount	$ 0	$ 518,000

X

- Definition

Represents the monetary amount of one former branch location, 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

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

+ References

No definition available.

+ Details

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Namespace Prefix:	gsbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of lessee's right to use underlying assets under operating lease.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the monetary amount of Valuation write-downs on foreclosed assets, during the indicated time period.

+ References

No definition available.

+ Details

Name:	gsbc_ValuationWriteDownsOnForeclosedAssets
Namespace Prefix:	gsbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

Recorded investment of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 35
-URI http://asc.fasb.org/extlink&oid=123577603&loc=SL49126937-111524

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	instant

X

- Details

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

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_ResidentialMortgageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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