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Loans and Allowance for Credit Losses - Weighted Average Interest Rate on Loans Receivable (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Commercial loan participations sold to other financial institutions	$ 301.4	$ 334.6
Residential mortgage loans sold	95.6	105.3
Unpaid principal balances
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loans serviced for others	397.0	439.9
Unused lines of Credit
LOANS AND ALLOWANCE FOR CREDIT LOSSES
Loans serviced for others	$ 34.0	$ 123.6

X

- Definition

Represents the monetary amount of Commercial loan participations sold to other financial institutions, 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 Loans serviced for others, during the indicated time period.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the monetary amount of Residential mortgage loans sold, 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

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph c
-Publisher SEC

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

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X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: